Loading...
Lower Cape Fear River Program 2006 reportEnvironmental Assessment of the Lower Cape Fear River System, 2006 By Michael A. Mallin, Matthew R. McIver and James F. Merritt December 2007 CMS Report No. 07-02 Center for Marine Science University of North Carolina Wilmington Wilmington, N.C. 28409 Executive Summary Multiparameter water sampling for the Lower Cape Fear River Program (LCFRP) has been ongoing since June 1995. Scientists from the University of North Carolina Wilmington (UNCW) perform the sampling effort. The LCFRP currently encompasses 36 water sampling stations throughout the Cape Fear, Black, and Northeast Cape Fear River watersheds. The LCFRP sampling program includes physical, chemical, and biological water quality measurements and analyses of the benthic and epibenthic macroinvertebrate communities, and has in the past included assessment of the fish communities. Principal conclusions of the UNCW researchers conducting these analyses are presented below, with emphasis on the period January - December 2006. The opinions expressed are those of UNCW scientists and do not necessarily reflect viewpoints of individual contributors to the Lower Cape Fear River Program. The mainstem lower Cape Fear River is characterized by periodically turbid water containing moderate to high levels of inorganic nutrients. It is fed by two large blackwater rivers (the Black and Northeast Cape Fear Rivers) that have low levels of turbidity, but highly colored water with less inorganic nutrient content than the mainstem. While nutrients are reasonably high in the river channels, algal blooms are rare because light is attenuated by water color or turbidity, and flushing is high. Periodic algal blooms are seen in the tributary stream stations, some of which are impacted by point source discharges. Below some point sources, nutrient loading can be high and fecal coliform contamination occurs. Other stream stations drain blackwater swamps or agricultural areas, some of which periodically show elevated pollutant loads or effects. Average annual dissolved oxygen (DO) levels at the river channel stations for 2006 were similar to the average for 1996-2005. Dissolved oxygen levels were lowest during the summer, often falling below the state standard of 5.0 mg/L at several river and upper estuary stations. There is a dissolved oxygen sag in the main river channel that begins at Station DP below a paper mill discharge and near the Black River input, and persists into the mesohaline portion of the estuary. Mean oxygen levels were highest at the upper river stations NC11 and AC and in the middle to lower estuary at stations M23 and M18. Lowest mainstem mean 2006 DO levels occurred at the lower river and upper estuary stations NAV, HB, BRR and M61 (6.7-6.8 mg/L). As the water reaches the lower estuary higher algal productivity, mixing and ocean dilution help alleviate oxygen problems. The Northeast Cape Fear and Black Rivers generally have lower DO levels than the mainstem Cape Fear River. These rivers are classified as blackwater systems because of their tea colored water. The Northeast Cape Fear River in general seems to be more oxygen stressed than the Black River; in 2006 Station NCF117 had DO concentrations below 4.0 mg/L 33% of the time sampled, while during that same period Station B210 had DO below 4.0 mg/L 0% of the occasions sampled. Several stream stations were severely stressed in terms of low dissolved oxygen during the year 2006. Station GS had DO levels below 4.0 mg/L 50% of the occasions sampled, NC403 33%, SR 33% and ANC 25%. Smith Creek had DO levels below 5.0 mg/L 36% of the time. Annual mean turbidity levels for 2006 were considerably lower than the long-term average, probably a result of low rainfall. Highest mean turbidities were at NAV, then the upper river sites N11 and AC (15-18 NTU) with turbidities gradually decreasing downstream through the estuary. Turbidity was lower in the blackwater tributaries (Northeast Cape Fear River and Black River) than in the mainstem river. Regarding stream stations, chronic or periodic high nutrient levels were found at a number of sites, including BC117, 6RC, GCO,NC403 and PB. Algal blooms were rare in 2006, only occurring in July and August at Stations GS, PB, LRC and BCRR. Several stream stations, particularly BCRR, BC117, HAM, SAR, PB , ROC, and LRC showed high fecal coliform counts on a number of occasions. On a few occasions biochemical oxygen demand (BOD) concentrations in several Northeast Cape Fear River watershed stream stations (especially N403 and BC117, were elevated (BOD5 greater than 2.5 mg/L). Water column metals concentrations were not problematic during 2006. This report includes an in-depth look at each subbasin, comparing the results of the North Carolina Division of Water Quality's 2005 Basinwide Management Plan use support ratings with the UNCW-Aquatic Ecology Laboratory’s (AEL) assessments of the 2006 sampling year. The UNCW-AEL utilized ratings that consider a water body to be of poor quality if the water quality standard for a given parameter is in violation > 25% of the time, of fair quality if the standard is in violation between 11 and 25% of the time, and good quality if the standard is violated no more than 10% of the time. UNCW also considerers nutrient loading in water quality assessments, based on published experimental and field scientific findings. For the 2006 period UNCW rated all stations as good in terms of chlorophyll a. For turbidity 100% of the sites were rated good. However, 57% of the stations had either fair or poor water quality in terms of fecal coliform bacterial contamination – more than double that of 2005. Using the 5.0 mg/L DO standard for the Piedmont river stations, and the 4.0 mg/L “swamp water” DO standard for the stream stations and blackwater river stations, 47% of the sites were rated poor or fair for dissolved oxygen, slightly more than in 2005. In addition, by our UNCW standards excessive nitrate and phosphorus concentrations were problematic at a number of stations (Chapter 3). Table of Contents 1.0 Introduction...........................................................................………...............…........1 1.1 Site Description................................................………....................................2 1.2 Report Organization………………………………………………………………..2 2.0 Physical, Chemical, and Biological Characteristics of the Lower Cape Fear River and Estuary………………………………………………..…………………….....….. ….8 Physical Parameters..…......................………..........................................……....11 Chemical Parameters…....……..……….........................................................…..14 Biological Parameters.......……….....……......................................................…..17 3.0 Water Quality by Subbasin in the Lower Cape Fear River System…………………49 1 1.0 Introduction Michael A. Mallin Aquatic Ecology Laboratory Center for Marine Science University of North Carolina Wilmington The Lower Cape Fear River Program is a unique science and education program that has a mission to develop an understanding of processes that control and influence the ecology of the Cape Fear River, and to provide a mechanism for information exchange and public education. This Program provides a forum for dialogue among the various Cape Fear River user groups and encourages interaction among them. Overall policy is set by an Advisory Board consisting of representatives from citizen’s groups, local government, industries, academia, the business community, and regulatory agencies. This report represents the scientific conclusions of the UNCW researchers participating in this Program and does not necessarily reflect opinions of all other Program participants. This report focuses on the period January through December 2006. The scientific basis of the Program consists of the implementation of an ongoing comprehensive physical, chemical, and biological monitoring program. Another part of the mission is to develop and maintain a data base on the Cape Fear basin and make use of this data to develop management plans. Presently the Program has amassed a ten-year (1995-2005) data base freely available to the public. Using this monitoring data as a framework the Program goals also include focused scientific projects and investigation of pollution episodes. The scientific aspects of the Program are carried out by investigators from the University of North Carolina Wilmington Center for Marine Science. The monitoring program was developed by the Lower Cape Fear River Program Technical Committee, which consists of representatives from UNCW, the North Carolina Division of Water Quality, The NC Division of Marine Fisheries, the US Army Corps of Engineers, technical representatives from streamside industries, the City of Wilmington Wastewater Treatment Plants, Cape Fear Community College, Cape Fear River Watch, the North Carolina Cooperative Extension Service, the US Geological Survey, forestry and agriculture organizations, and others. This integrated and cooperative program was the first of its kind in North Carolina. Broad-scale monthly water quality sampling at 16 stations in the estuary and lower river system began in June 1995 (directed by Dr. Michael Mallin). Sampling was increased to 34 stations in February of 1996, 35 stations in February 1998, and 36 stations in 2005. The Lower Cape Fear River Program added another component concerned with studying the benthic macrofauna of the system in 1996. This component is directed by Dr. Martin Posey and Mr. Troy Alphin of the UNCW Biology Department and includes the benefit of additional data collected by the Benthic Ecology Laboratory under Sea Grant and NSF sponsored projects in the Cape Fear Estuary. The third major biotic component (added in January 1996) was an extensive fisheries program directed by Dr. Mary Moser of the UNCW Center for Marine Science Research, with subsequent (1999) overseeing by Mr. Michael Williams and Dr. Thomas Lankford of UNCW-CMS. This 2 program involved cooperative sampling with the North Carolina Division of Marine Fisheries and the North Carolina Wildlife Resources Commission. The fisheries program ended in December 1999, but was renewed with additional funds from the Z. Smith Reynolds Foundation from spring – winter 2000, and has been operational periodically for special projects since that period. The regular sampling that was conducted by UNCW biologists was assumed by the North Carolina Division of Marine Fisheries. 1.1 Site Description The mainstem of the Cape Fear River is formed by the merging of the Haw and the Deep Rivers in Chatham County in the North Carolina Piedmont. However, its drainage basin reaches as far upstream as the Greensboro area (Fig. 1.1). The mainstem of the river has been altered by the construction of several dams and water control structures. In the coastal plain, the river is joined by two major tributaries, the Black and the Northeast Cape Fear Rivers (Fig. 1.1). These 5th order blackwater streams drain extensive riverine swamp forests and add organic color to the mainstem. The watershed (about 9,149 square miles) is the most heavily industrialized in North Carolina with 244 permitted wastewater discharges and (as of 2000) over 1.83 million people residing in the basin (NCDENR 2005). Approximately 24% of the land use in the watershed is devoted to agriculture and livestock production (NCDENR 2005), with livestock production dominated by swine and poultry operations. Thus, the watershed receives considerable point and non-point source loading of pollutants. However, the estuary is a well-flushed system, with flushing tie ranging from 1 to 22 days with a median flushing time of about seven days, much shorter than the other large N.C. estuaries to the north (Ensign et al. 2004). Water quality is monitored by boat at ten stations in the Cape Fear Estuary (from Navassa to Southport) and one station in the Northeast Cape Fear Estuary (Table 1.1; Fig. 1.1). Riverine stations sampled by boat include NC11, AC, DP, IC, and BBT (Table 1.1; Fig. 1.1). NC11 is located upstream of any major point source discharges in the lower river and estuary system, and is considered to be representative of water quality entering the lower system. BBT is located on the Black River between Thoroughfare and the mainstem Cape Fear, and is influenced by both rivers. We consider B210 and NCF117 to represent water quality entering the lower Black and Northeast Cape Fear Rivers, respectively. Data has also been collected at stream and river stations throughout the Cape Fear, Northeast Cape Fear, and Black River watersheds (Table 1.1; Fig. 1.1). Data collection at a station in the Atlantic Intracoastal Waterway was initiated in February 1998 to obtain water quality information near the Southport Wastewater Treatment Plant discharge. 1.2 Report Organization This report contains two sections assessing LCFRP data. Section 2 presents an overview of physical, chemical, and biological water quality data from the 36 individual stations, and provides tables of raw data as well as figures showing spatial or temporal 3 trends. In Section 3 we analyze our data by sub-basin, compare our results with DWQ's 2006 Basinwide Plan, and make water quality ratings for dissolved oxygen, turbidity, chlorophyll a, metals, and fecal coliform bacterial abundance. We also utilize other relevant parameters such as nutrient concentrations to aid in these assessments. This section is designed so that residents of a particular sub-basin can see what the water quality is like in his or her area based on LCFRP data collections. The LCFRP has a website that contains maps and an extensive amount of past water quality, benthos, and fisheries data gathered by the Program available at: www.uncwil.edu/cmsr/aquaticecology/lcfrp/ 1.3 References Cited Ensign, S.H., J.N. Halls and M.A. Mallin. 2004. Application of digital bathymetry data in an analysis of flushing times of two North Carolina estuaries. Computers and Geosciences 30:501-511. NCDENR. 2005. Cape Fear River Basinwide Water Quality Plan. North Carolina Department of Environment and Natural Resources, Division of Water Quality/Planning, Raleigh, NC, 27699-1617. 4 Table 1.1. Description of sampling locations in the Cape Fear Watershed, 2006, including UNCW designation and NCDWQ station designation number. ________________________________________________________________ UNCW St. DWQ No. Location ________________________________________________________________ High order river and estuary stations NC11 B8360000 At NC 11 bridge on Cape Fear River (CFR) GPS N 34.39663 W 78.26785 LVC2 B8441000 on Livingston Creek near Acme GPS N 34.33530 W 78.2011 AC B8450000 5 km downstream from International Paper on CFR GPS N 34.35547 W 78.17942 DP B8460000 At Dupont Intake above Black River GPS N 34.33595 W 78.05337 IC B9030000 Cluster of dischargers upstream of Indian Cr. on CFR GPS N 34.30207 W 78.01372 B210 B9000000 Black River at Highway 210 bridge GPS N 34.43138 W 78.14462 BBT none Black River between Thoroughfare and Cape Fear River GPS N 34.35092 W 78.04857 NCF117 B9580000 Northeast Cape Fear River at Highway 117, Castle Hayne GPS N 34.36342 W 77.89678 NCF6 B9670000 Northeast Cape Fear River near GE dock GPS N 34.31710 W 77.95383 NAV B9050000 Railroad bridge over Cape Fear River at Navassa GPS N 34.25943 W 77.98767 HB B9050100 Cape Fear River at Horseshoe Bend GPS N 34.24372 W 77.96980 BRR B9790000 Brunswick River near new boat ramp in Belville GPS N 34.22138 W 77.97868 5 M61 B9750000 Channel Marker 61, downtown at N.C. State Port GPS N 34.19377 W 77.95725 M54 B7950000 Channel Marker 54, 5 km downstream of Wilmington GPS N 34.13933 W 77.94595 M42 B9845100 Channel Marker 42 near Keg Island GPS N 34.09017 W 77.93355 M35 B9850100 Channel Marker 35 near Olde Brunswick Towne GPS N 34.03408 W 77.93943 M23 B9910000 Channel Marker 23 near CP&L intake canal GPS N 33.94560 W 77.96958 M18 B9921000 Channel Marker 18 near Southport GPS N 33.91297 W 78.01697 SPD B9980000 1000 ft W of Southport WWT plant discharge on ICW GPS N 33.91708 W 78.03717 ________________________________________________________________ Tributary stations collected from land ________________________________________________________________ SR B8470000 South River at US 13, below Dunn runoff GPS N 35.15600 W 78.64013 GCO B8604000 Great Coharie Creek at SR 1214 GPS N 34.91857 W 78.38873 LCO B8610001 Little Coharie Creek at SR 1207 GPS N 34.83473 W 78.37087 6RC B8740000 Six Runs Creek at SR 1003 (Lisbon Rd.) GPS N 34.79357 W 78.31192 BRN B8340050 Browns Creek at NC 87 GPS N 34.61360 W 78.58462 HAM B8340200 Hammonds Creek at SR 1704 GPS N 34.56853 W 78.55147 COL B8981000 Colly Creek at NC 53 GPS N 34.46500 W 78.26553 6 ANC B9490000 Angola Creek at NC 53 GPS N 34.65705 W 77.73485 NC403 B9090000 Northeast Cape Fear below Mt. Olive Pickle at NC403 GPS N 35.17838 W 77.98028 PB B9130000 Panther Branch below Cates Pickle GPS N 35.13445 W 78.13630 GS B9191000 Goshen Swamp at NC 11 GPS N 35.02923 W 77.85143 SAR B9191500 Northeast Cape Fear River near Sarecta GPS N 34.97970 W 77.86251 LRC B9460000 Little Rockfish Creek at NC 11 GPS N 34.72247 W 77.98145 ROC B9430000 Rockfish Creek at US 117 GPS N 34.71689 W 77.97961 BCRR B9500000 Burgaw Canal at Wright St., above WWTP GPS N 34.56334 W 77.93481 BC117 B9520000 Burgaw Canal at US 117, below WWTP GPS N 34.56391 W 77.92210 SC-CH Smith Creek at Castle Hayne Rd. GPS N 34.25897 W 77.93872 7 Figure 1.1 Map of the Lower Cape Fear River system and the LCFRP sampling stations. 8 2.0 - Physical, Chemical, and Biological Characteristics of the Lower Cape Fear River and Estuary Michael A. Mallin and Matthew R. McIver Aquatic Ecology Laboratory Center for Marine Science University of North Carolina Wilmington 2.1 Introduction This section of the report includes a discussion of the physical, chemical, and biological water quality parameters, concentrating on the January-December 2006 Lower Cape Fear River Program monitoring period. These parameters are interdependent and define the overall condition of the river. Physical parameters measured during this study included water temperature, dissolved oxygen, field turbidity and laboratory turbidity, total suspended solids (TSS), salinity, conductivity, pH and light attenuation. The chemical makeup of the Cape Fear River was investigated by measuring the magnitude and composition of nitrogen and phosphorus in the water, as well as concentrations of United States Environmental Protection Agency (US EPA) priority pollutant metals. Three biological parameters including fecal coliform bacteria, chlorophyll a and biochemical oxygen demand were examined. 2.2 Materials and Methods All samples and field parameters collected for the estuarine stations of the Cape Fear River (NAV down through M18) were gathered on an ebb tide. This was done so that the data better represented the river water flowing downstream through the system rather than the tidal influx of coastal ocean water. Sample collection and analyses were conducted according to the procedures in the Lower Cape Fear River Program Quality Assurance/Quality Control (QA/QC) manual. Technical Representatives from the LCFRP Technical Committee and representatives from the NC Division of Water Quality inspect UNCW laboratory procedures and periodically accompany field teams to verify proper procedures are followed. We note that our previous Livingston Creek station (LVC) has been discontinued and a new station sampled from the dock of the Wright Chemical Company near Acme (LVC2) was put into operation in 2005. Physical Parameters Water Temperature, pH, Dissolved Oxygen, Turbidity, Salinity, Conductivity Field parameters were measured at each site using a YSI 6920 (or 6820) multi- parameter water quality sonde displayed on a YSI 650 MDS. Each parameter is measured with individual probes on the sonde. At stations sampled by boat (see Table 1.1) physical parameters were measured at 0.1 m, the middle of the water column, and at the bottom (up to 12 m). Occasionally, high flow prohibited the sonde from reaching 9 the actual bottom and measurements were taken as deep as possible. At the terrestrially sampled stations the physical parameters were measured at a depth of 0.1 m. Our laboratory at the UNCW CMS is State-certified by the N.C. Division of Water Quality to perform field parameter measurements. Chemical Parameters Nutrients All nutrient analyses were performed at the UNCW Center for Marine Science (CMS) for samples collected prior to January 1996. A local State-certified analytical laboratory was contracted to conduct all subsequent analyses except for orthophosphate, which is performed at CMS. The following methods detail the techniques used by CMS personnel for orthophosphate analysis. Orthophosphate (PO4-3) Water samples were collected ca. 0.1 m below the surface in triplicate in amber 125 mL Nalgene plastic bottles and placed on ice. In the laboratory 50 mL of each triplicate was filtered through separate1.0 micron pre-combusted glass fiber filters, which were frozen and later analyzed for chlorophyll a. The triplicate filtrates were pooled in a glass flask, mixed thoroughly, and approximately 100 mL was poured into a 125 mL plastic bottle to be analyzed for orthophosphate. Samples were frozen until analysis. Orthophosphate analyses were performed in duplicate using an approved US EPA method for the Bran-Lubbe AutoAnalyzer (Method 365.5). In this technique the orthophosphate in each sample reacts with ammonium molybdate and anitmony potassium tartrate in an acidic medium (sulfuric acid) to form an anitmony-phospho- molybdate complex. The complex is then reacted with ascorbic acid and forms a deep blue color. The intensity of the color is measured at a wavelength of 880 nm by a colorimeter and displayed on a chart recorder. Standards and spiked samples were analyzed for quality assurance. Biological Parameters Fecal Coliform Bacteria Fecal coliform bacteria were analyzed at a State-certified laboratory contracted by the LCFRP. Samples were collected approximately 0.1 m below the surface in sterile plastic bottles provided by the contract laboratory and placed on ice for no more than six hours before analysis. 10 Chlorophyll a The analytical method used to measure chlorophyll a is described in Welschmeyer (1994) and US EPA (1997) and was performed by CMS personnel. Chlorophyll a concentrations were determined directly from the 1.0 micron filters used for filtering samples for orthophosphate analysis. All filters were wrapped individually in foil, placed in airtight containers and stored in the freezer. During analysis each filter is immersed in 10 mL of 90% acetone for 24 hours, which extracts the chlorophyll a into solution. Additionally, filters from samples taken at M61, M18, BC117 and BCRR are ground during the extraction process. Chlorophyll a concentration of each solution is measured on a Turner 10-AU fluorometer. The fluorometer uses an optimal combination of excitation and emission bandwidth filters which reduces the errors inherent in the acidification technique. Our laboratory at the CMS is State-certified by the N.C. Division of Water Quality for the analysis of chlorophyll a. Biochemical Oxygen Demand (BOD) Five sites were originally chosen for BOD analysis. One site was located at NC11, upstream of International Paper, and a second site was at AC, about 3 miles downstream of International Paper (Fig.1.1). Two sites were located in blackwater rivers (NCF117 and B210) and one site (BBT) was situated in an area influenced by both the mainstem Cape Fear River and the Black River. For the sampling period May 2000-April 2004 additional BOD data were collected at stream stations 6RC, LCO, GCO, BRN, HAM and COL in the Cape Fear and Black River watersheds. In May 2004 those stations were dropped and sampling commenced at ANC, SAR, GS, N403, ROC and BC117 in the Northeast Cape Fear River watershed. The procedure used for BOD analysis was Method 5210 in Standard Methods (APHA 1995). Samples were analyzed for both 5-day and 20-day BOD. During the analytical period, samples were kept in airtight bottles and placed in an incubator at 20o C. All experiments were initiated within 6 hours of sample collection. Samples were analyzed in duplicate. Dissolved oxygen measurements were made using a YSI Model 57 meter that was air-calibrated. No adjustments were made for pH since most samples exhibited pH values within or very close to the desired 6.5-7.5 range (pH is monitored during the analysis as well). Several sites have naturally low pH and there was no adjustment for these samples because it would alter the natural water chemistry and affect true BOD. 2.3 Results and Discussion This section includes results from monitoring of the physical, biological, and chemical parameters at all stations for the time period January-December 2006. Discussion of the data focuses mainly on the river channel stations, but poor water quality conditions at stream stations will also be discussed. The contributions of the two large blackwater tributaries, the Northeast Cape Fear River and the Black River, are represented by conditions at NCF117 and B210, respectively. The Cape Fear Region did not experience any significant hurricane activity during this monitoring period (after major 11 hurricanes in 1996, 1998, and 1999). Therefore this report reflects low to medium flow conditions for the Cape Fear River and Estuary. Physical Parameters Water temperature Water temperatures at all stations ranged from 4.6 to 31.7 oC and individual station annual averages ranged from 16.2 to 20.9oC (Table 2.1). Highest temperatures occurred during July and August and lowest temperatures during February. Stream stations were generally cooler than river stations, most likely because of shading and lower nighttime air temperatures affecting the shallower waters. Salinity Salinity at the estuarine stations ranged from 0.0 to 33.2 practical salinity units (psu) and station annual means ranged from 0.9 to 24.1 psu (Table 2.2). Lowest salinities occurred in September and highest salinities occurred in November. Two stream stations, NC403 and PB, had occasional oligohaline conditions due to discharges from pickle production facilities. Annual mean salinity for 2006 was equivalent to that of the ten-year average for 1996-2005 for all stations, and slightly lower at the lower estuarine stations (Figure 2.1). Conductivity Conductivity at estuarine stations ranged from 0.08 to 50.60 mS/cm and from 0.0 to 3.33 mS/cm at the freshwater stations (Table 2.3). Temporal conductivity patterns followed those of salinity. Dissolved ionic compounds increase the conductance of water, therefore, conductance increases and decreases with salinity, often reflecting river flow conditions due to rainfall. Conductivity may also reveal point source pollution sources, as is seen at BC117, which is below a municipal wastewater discharge. Stations PB and NC403 are below an industrial discharge, and often have elevated conductivity. pH pH values ranged from 3.8 to 8.1 and station annual medians ranged from 3.9 to 7.9 (Table 2.4). pH was typically lowest upstream due to acidic swamp water inputs and highest downstream as alkaline seawater mixes with the river water. Low pH values at COL predominate because of naturally acidic blackwater inputs. 12 Dissolved Oxygen Dissolved oxygen (DO) problems are a major water quality concern in the lower Cape Fear River and its estuary, and several of the tributary streams (Mallin et al. 1999; 2000; 2001a; 2001b; 2002a; 2002b; 2003; 2004; 2005a; 2006). Surface concentrations in 2006 ranged from 0.4 to 12.8 mg/L and station annual means ranged from 4.0 to 9.2 mg/L (Table 2.5). Average annual DO levels at the river channel stations for 2006 were very similar to the average for 1996-2005 (Figure 2.2). Dissolved oxygen levels were lowest during the summer (Table 2.5), often falling below the state standard of 5.0 mg/L at several river and upper estuary stations. Working synergistically to lower oxygen levels are two factors: lower oxygen carrying capacity in warmer water and increased bacterial respiration (or biochemical oxygen demand, BOD), due to higher temperatures in summer. Unlike other large North Carolina estuaries (the Neuse, Pamlico and New River) the Cape Fear estuary rarely suffers from dissolved oxygen stratification. This is because despite salinity stratification the oxygen remains well mixed due to strong estuarine gravitational circulation and high freshwater inputs (Lin et al. 2006). Thus, hypoxia in the Cape Fear is present throughout the water column. There is a dissolved oxygen sag in the main river channel that begins at DP below a paper mill discharge and persists into the mesohaline portion of the estuary (Fig. 2.2). Mean oxygen levels were highest at the upper river stations NC11 and AC and in the middle to lower estuary at stations M23 and M18. Lowest mainstem mean 2006 DO levels occurred at the lower river and upper estuary stations NAV, HB, BRR and M61 (6.7-6.8 mg/L). Discharge of high BOD waste from the paper/pulp mill just above the AC station (Mallin et al. 2003), as well as inflow of blackwater from the Northeast Cape Fear and Black Rivers, help to diminish oxygen in the upper estuary. As the water reaches the lower estuary higher algal productivity, mixing and ocean dilution help alleviate oxygen problems. The Northeast Cape Fear and Black Rivers generally have lower DO levels than the mainstem Cape Fear River (NCF117 2006 mean = 6.1, NCF6 = 6.6, B210 2006 mean = 7.0). These rivers are classified as blackwater systems because of their tea colored water. As the water passes through swamps en route to the river channel, tannins from decaying vegetation leach into the water, resulting in the observed color. Decaying vegetation on the swamp floor has an elevated biochemical oxygen demand and usurps oxygen from the water, leading to naturally low dissolved oxygen levels. Runoff from concentrated animal feeding operations (CAFOs) may also contribute to chronic low dissolved oxygen levels in these blackwater rivers (Mallin et al. 1998; 1999; 2006; Mallin 2000). The Northeast Cape Fear River in general seems to be more oxygen stressed than the Black River; in 2006 NCF117 had DO concentrations below 4.0 mg/L 33% of the time sampled, while during that same period B210 had DO below 4.0 mg/L 0% of the occasions sampled (Table 2.5) Several stream stations were severely stressed in terms of low dissolved oxygen during the year 2006. ANC had DO levels below 4.0 mg/L 25% of the occasions sampled, 13 NC403 33%, GS 50% and SR 33% (Table 2.5). Some of this can be attributed to low water conditions and some potentially to CAFO runoff; however point-source discharges also likely contribute to low dissolved oxygen levels at NC403 and possibly SR, especially via nutrient loading (Mallin et al. 2001a; 2002a; 2004). Smith Creek had DO levels below 5.0 mg/L 36% of the time. Hypoxia is thus a widespread problem, with 47% of the sites impacted in 2006. Field Turbidity Field turbidity levels ranged from 0 to 78 nephelometric turbidity units (NTU) and station annual means ranged from 2 to 18 NTU (Table 2.6). Annual mean turbidity levels for 2006 were considerably lower than the long-term average (Fig. 2.3) probably a result of generally low rainfall and a lack of major storm activity. Highest mean turbidities were at NAV (18 NTU) followed by the upper river sites N11, AC and DP (14-15 NTU) with turbidities gradually decreases downstream through the estuary (Figure 2.3). Turbidity was lower in the blackwater tributaries (Northeast Cape Fear River and Black River) than in the mainstem river. Note: In addition to the laboratory-analyzed turbidity, the LCFRP uses nephelometers designed for field use, which allows us to acquire in situ turbidity from a natural situation. North Carolina regulatory agencies are required to use turbidity values from water samples removed from the natural system, put on ice until arrival at a State- certified laboratory, and analyzed using laboratory nephelometers. Standard Methods notes that transport of samples and temperature change alters true turbidity readings. Our analysis of samples using both methods shows that lab turbidity is nearly always lower than field turbidity; thus we do not discuss lab turbidity in this report. Total Suspended Solids Total suspended solid (TSS) values system wide ranged from 0 to 71 mg/L with station annual means from 2 to 20 mg/L (Table 2.7). The overall highest values were in the ICW at Station SPD. For the river channel stations TSS was highest in mid-estuary at M54, next in the upper estuary at NAV, and somewhat lower in the lower estuary. In the stream stations TSS was generally low, except for BC117. Although total suspended solids (TSS) and turbidity both quantify suspended material in the water column, they do not always go hand in hand. High TSS does not mean high turbidity and vice versa. This anomaly may be explained by the fact that fine clay particles are effective at dispersing light and causing high turbidity readings, while not resulting in high TSS. On the other hand, large organic or inorganic particles may be less effective at dispersing light, yet their greater mass results in high TSS levels. 14 Light Attenuation The attenuation of solar irradiance through the water column is measured by a logarithmic function (k) per meter. The higher this light attenuation coefficient is the more strongly light is attenuated (through absorbance or reflection) in the water column. River and estuary light attenuation coefficients ranged from 1.27 to 6.72/m and station annual means ranged from 1.70 at M18 to 4.00 /m at NCF6 (Table 2.8). High light attenuation did not always coincide with high turbidity. Blackwater, though low in turbidity, will attenuate light through absorption of solar irradiance. At NCF6 and BBT, blackwater stations with moderate turbidity levels, light attenuation was high. Compared to other North Carolina estuaries the Cape Fear has high average light attenuation. The high average light attenuation is a major reason why phytoplankton production in the major rivers and the estuary of the LCFR is generally low. Whether caused by turbidity or water color this attenuation tends to limit light availability to the phytoplankton (Mallin et al. 1997; 1999; 2004). Chemical Parameters – Nutrients Total Nitrogen Total nitrogen (TN) is calculated from TKN (see below) plus nitrate; it is not analyzed in the laboratory. TN ranged from 190 to 12,780 µg/L and station annual means ranged from 567 to 4,533 µg/L (Table 2.9). Mean total nitrogen in 2006 was equivalent to the ten-year mean at some channel stations and higher than the mean in the lower main river, the lower estuary, and the two major blackwater tributaries (Figure 2.4). Previous research (Mallin et al. 1999) has shown a positive correlation between river flow and TN in the Cape Fear system. Total nitrogen concentrations remained fairly constant down the river and declined from mid-estuary into the lower estuary, most likely reflecting uptake of nitrogen into the food chain through algal productivity and subsequent grazing by planktivores as well as through dilution and marsh denitrfication. The blackwater rivers maintained TN concentrations equal to or somewhat lower than those found in the mainstem Cape Fear River. One stream station, BC117, had a very high mean of 4,533 µg/L, likely from the upstream Town of Burgaw wastewater discharge. ANC, ROC, 6RCand SAR also had comparatively high TN values among the stream stations. Temporal patterns for TN were not evident. Nitrate+Nitrite Nitrate+nitrite (henceforth referred to as nitrate) is the main species of inorganic nitrogen in the Lower Cape Fear River. Concentrations system wide ranged from 5 (detection limit) to 11,610 µg/L and station annual means ranged from 86 to 2,182 µg/L 15 (Table 2.10). The highest riverine nitrate levels were at AC (545 µg/L) and NC11 (490 µg/L) indicating that much of this nutrient is imported from upstream. Moving downstream, nitrate levels decrease most likely as a result of uptake by primary producers, microbial denitrification in riparian marshes and tidal dilution. Despite this, the rapid flushing of the estuary (Ensign et al. 2004) permits sufficient nitrate to enter the coastal ocean in the plume and contribute to offshore productivity (Mallin et al. 2005b). Nitrate can limit phytoplankton production in the lower estuary in summer (Mallin et al. 1999). The blackwater rivers carried low loads of nitrate compared to the mainstem Cape Fear stations; i.e. the Northeast Cape Fear River (NCF117 mean = 180 µg/L) and the Black River (B210 = 187 µg/L). No clear temporal pattern was observable for nitrate. Several stream stations showed high levels of nitrate on occasion including SAR, NC403, PB, BC117, ROC, 6RC and LCO. NC403 and PB are downstream of industrial wastewater discharges and SAR, ROC and 6RC primarily receive non-point agricultural or animal waste drainage. BC117 frequently showed high nitrate levels. The Town of Burgaw wastewater plant, upstream of BC117, has no nitrate discharge limits. Over the past several years a considerable number of experiments have been carried out by UNCW researchers to assess the effects of nutrient additions to water collected from blackwater streams and rivers (i.e. the Black and Northeast Cape Fear Rivers, and Colly and Great Coharie Creeks). These experiments have collectively found that additions of nitrogen (as either nitrate, ammonium, or urea) significantly stimulate phytoplankton production and BOD increases. Critical levels of these nutrients were in the range of 0.2 to 0.5 mg/L as N (Mallin et al. 1998; Mallin et al. 2001a; Mallin et al. 2002a, Mallin et al. 2004). Thus, we conservatively consider nitrate concentrations exceeding 0.5 mg/L as N in Cape Fear watershed streams to be potentially problematic to the streams environmental health. Ammonium Ammonium concentrations ranged from 5 (detection limit) to 6,510 µg/L and station annual means ranged from 18 to 794 µg/L (Table 2.11). River areas with the highest mean ammonium levels this monitoring period included AC, which is below a pulp mill discharge, and DP, located downstream of AC. Ocean dilution and biological uptake accounts for decreasing levels in the lower estuary. At the stream stations, areas with periodic high levels of ammonium include LVC2, ANC, SAR, NC403, BRN, 6RC and PB. BC117 had very high concentrations in February and March (1,970 and 6,510 µg/L, respectively) – this station lies downstream of the Burgaw wastewater treatment plant. Total Kjeldahl Nitrogen Total Kjeldahl Nitrogen (TKN) is a measure of the total concentration of organic nitrogen plus ammonium. TKN ranged from 190 to 11,290 µg/L and station annual means 16 ranged from 483 to 2,352 µg/L (Table 2.12). TKN concentration drops down through the estuary, likely due to ocean dilution and food chain uptake of nitrogen. Total Phosphorus Total phosphorus (TP) concentrations ranged from 10 (detection limit) to 2,810 µg/L and station annual means ranged from 49 to 788 µg/L (Table 2.13). Mean TP for 2006 was lower than the ten-year mean from the upper river to mid-estuary, and higher than the mean at the lower estuary and the major blackwater tributaries (Figure 2.5). In the river TP is highest at the upper riverine channel stations and declines downstream into the estuary. Some of this decline is attributable to the settling of phosphorus-bearing suspended sediments, yet incorporation of phosphorus into the food chain is also responsible. A temporal pattern of higher summer TP is a result of increasing orthophosphate during the summer. The experiments discussed above in the nitrate subsection also involved additions of phosphorus, either as inorganic orthophosphate or a combination of inorganic plus organic P. The experiments showed that additions of P exceeding 0.5 mg/L led to significant increases in bacterial counts, as well as significant increases in BOD over control. Thus, we consider concentrations of phosphorus above 0.5 to be potentially problematic to blackwater streams. Streams periodically exceeding this critical concentration included GS, NC403, GCO and BC117. Some of these stations (BC117, NC403) are downstream of industrial or wastewater discharges, while GS and GCO are in non-point agricultural areas. Orthophosphate Orthophosphate ranged from 0 to 1,860 µg/L and station annual means ranged from 11 to 568 µg/L (Table 2.14). Much of the orthophosphate load is imported into the Lower Cape Fear system from upstream areas, as NC11 typically has the highest levels. The Northeast Cape Fear River had higher orthophosphate levels than the Black River. Orthophosphate can bind to suspended materials and is transported downstream via particle attachment; thus high levels of turbidity at the uppermost river stations may be an important factor in the high orthophosphate levels. Turbidity declines toward the estuary because of settling, and orthophosphate concentration also declines. In the estuary, primary productivity helps reduce orthophosphate concentrations by assimilation into biomass. Orthophosphate levels typically reach maximum concentrations during summertime, when anoxic sediment releases bound phosphorus. Also, in the Cape Fear Estuary, summer algal productivity is limited by nitrogen, thereby allowing the accumulation of orthophosphate (Mallin et al. 1997; 1999). In spring, productivity in the estuary is usually limited by phosphorus (Mallin et al. 1997; 1999). The stream station BC117 had high orthophosphate levels while ANC, NC403, ROC and GCO had moderate levels. BC117 and NC403 are strongly influenced by industrial and municipal wastewater discharges, and ANC, ROC and GCO by agriculture/animal waste runoff. 17 Chemical Parameters - EPA Priority Pollutant Metals Aluminum levels in the Lower Cape Fear system were generally higher in the upper estuary and decreased toward the lower estuary (Table 2.15). Stream stations were generally low except COL, which is considered pristine, although acidic swamp water. There is no North Carolina aquatic standard for aluminum. Arsenic, cadmium, and chromium all maintained concentrations below detection limits at all stations (except As had measurable levels at SAR in June) throughout the year (Tables 2.16, 2.17, and 2.18). The As concentrations were all below the N.C. standard. Copper concentrations exceeded the state tidal saltwater standard of 3 µg/L once at estuarine station M18 (Table 2.19). The freshwater standard of 7 µg/L was exceeded once at the Stream DP. The LCFRP is an iron-rich system (Table 2.20). Stations SAR, LRC, 6RC and GCO maintained average iron concentrations above the state standard of 1000 µg/L. Iron concentrations generally decreased down-estuary. Water-column concentrations of lead, mercury, and nickel were below the analytical detection limit except once for lead at DP and once for nickel at COL; the peak at COL did exceed the N.C. state standard (Tables 2.21, 2.22, 2.23). Zinc concentrations exceeded the state standard once each at M18 and DP (Table 2.24). Biological Parameters Chlorophyll a During this monitoring period chlorophyll a was generally low to moderate at the river and estuarine stations (Table 2.25). System wide, chlorophyll a ranged from 0.1 to 36.5 µg/L and station annual means ranged from 0.7 –8.1 µg/L. Production of chlorophyll a biomass is low to moderate in this system primarily because of light limitation by turbidity in the mainstem and high organic color and low inorganic nutrients in the blackwater rivers. Spatially, highest values are normally found in the mid-to-lower estuary stations because light becomes more available downstream of the estuarine turbidity maximum (Figure 2.11). Flushing time of the Cape Fear estuary is rapid, ranging from 1-22 days with a median of 6.7 days (Ensign et al. 2004). This does not allow for much settling of suspended materials, leading to light limitation of phytoplankton production. Chlorophyll a production is extremely limited in the large 18 blackwater tributaries. Highest chlorophyll a concentrations were found during spring and summer. Substantial phytoplankton blooms occasionally occur at the stream stations (Table 2.25). These streams are generally shallow, so vertical mixing does not carry phytoplankton cells down below the critical depth where respiration exceeds photosynthesis. Thus, when flow conditions permit, elevated nutrient conditions (such as are periodically found in these stream stations) can lead to algal blooms. In areas where the forest canopy opens up large blooms can occur. When blooms occur in blackwater stream stations they can become sources of BOD upon death and decay, reducing further the low summer dissolved oxygen conditions common to these waters (Mallin et al. 2001; 2002; 2004). Stream algal blooms in 2006 occurred at GS, PB, and BCRR. Biochemical Oxygen Demand For the mainstem river, mean annual five-day biochemical oxygen demand (BOD5) concentrations were highest at AC, on average about 19% higher than at NC11 suggesting influence from the pulp/paper mill inputs (Table 2.26). BOD was somewhat lower during the winter. From 2000 until April 2004 we performed a project aimed at assessing rural Black River system stream contributions to BOD. In May 2004 we changed the stream sampling to the Northeast Cape Fear River watershed. Results of BOD analyses from several stream stations can be seen in Table 2.26. The data show generally greater BOD concentrations at the Northeast Cape Fear Watershed streams than the Black River Watershed streams. GS, BC117, LVC2 and N403 all showed large (> 3.3 mg/L) individual BOD5 measurements during 2006. Stations N403, LVC2 and BC117 are below point sources, but the other two sites are non-point runoff areas. Fecal Coliform Bacteria Fecal coliform (FC) bacterial counts ranged from 1 to >6,000 CFU/100 mL and station annual geometric means ranged from 15 to 1,111 CFU/100 mL (Table 2.27). The state human contact standard (200 CFU/100 mL) was exceeded at several mainstem sites during July and September in 2006. FC counts in 2006 were lower in the upper estuary compared with the ten-year average, but much higher than the long term average in mid-estuary and the two major blackwater tributaries (Figure 2.6). All stream stations surpassed the state standard for human contact of 200 CFU/100 mL on at least one occasion and several were particularly problematic. During 2006 PB exceeded the state standard 42% of the time, HAM 50%, BCRR 75%, BC117 and SAR 67%, LRC and ROC 33%, and ANC, GS, NC403, LVC2, SC-CH and BRN exceeded the 19 standard 25% of the time. BC117, NC403, LVC2 and PB are located below point source discharges and the other sites are primarily influenced by non-point source pollution. Overall, elevated fecal coliform counts are very problematic in this system, with 57% of the stations impacted in 2006. 2.4 References Cited APHA. 1995. Standard Methods for the Examination of Water and Wastewater, 19th ed. American Public Health Association, Washington, D.C. Ensign, S.H., J.N. Halls and M.A. Mallin. 2004. Application of digital bathymetry data in an analysis of flushing times of two North Carolina estuaries. Computers and Geosciences 30:501-511. Lin, J. L. Xie, L.J. Pietrafesa, J. Shen, M.A. Mallin and M.J. Durako. 2006. Dissolved oxygen stratification in two microtidal partially-mixed estuaries. Estuarine, Coastal and Shelf Science. 70:423-437. Mallin, M.A., L.B. Cahoon, M.R. McIver, D.C. Parsons and G.C. Shank. 1997. Nutrient limitation and eutrophication potential in the Cape Fear and New River Estuaries. Report No. 313. Water Resources Research Institute of the University of North Carolina, Raleigh, N.C. Mallin, M.A., L.B. Cahoon, D.C. Parsons and S.H. Ensign. 1998. Effect of organic and inorganic nutrient loading on photosynthetic and heterotrophic plankton communities in blackwater rivers. Report No. 315. Water Resources Research Institute of the University of North Carolina, Raleigh, N.C. Mallin, M.A., L.B. Cahoon, M.R. McIver, D.C. Parsons and G.C. Shank. 1999. Alternation of factors limiting phytoplankton production in the Cape Fear Estuary. Estuaries 22:985-996. Mallin, M.A. 2000. Impacts of industrial-scale swine and poultry production on rivers and estuaries. American Scientist 88:26-37. Mallin, M.A., M.H. Posey, M.R. McIver, S.H. Ensign, T.D. Alphin, M.S. Williams, M.L. Moser and J.F. Merritt. 2000. Environmental Assessment of the Lower Cape Fear River System, 1999-2000. CMS Report No. 00-01, Center for Marine Science, University of North Carolina at Wilmington, Wilmington, N.C. Mallin, M.A., L.B. Cahoon, D.C. Parsons and S.H. Ensign. 2001a. Effect of nitrogen and phosphorus loading on plankton in Coastal Plain blackwater streams. Journal of Freshwater Ecology 16:455-466. 20 Mallin, M.A., M.H. Posey, T.E. Lankford, M.R. McIver, S.H. Ensign, T.D. Alphin, M.S. Williams, M.L. Moser and J.F. Merritt. 2001b. Environmental Assessment of the Lower Cape Fear River System, 2000-2001. CMS Report No. 01-01, Center for Marine Science, University of North Carolina at Wilmington, Wilmington, N.C. Mallin, M.A., L.B. Cahoon, M.R. McIver and S.H. Ensign. 2002a. Seeking science- based nutrient standards for coastal blackwater stream systems. Report No. 341. Water Resources Research Institute of the University of North Carolina, Raleigh, N.C. Mallin, M.A., M.H. Posey, T.E. Lankford, M.R. McIver, H.A. CoVan, T.D. Alphin, M.S. Williams and J.F. Merritt. 2002b. Environmental Assessment of the Lower Cape Fear River System, 2001-2002. CMS Report No. 02-02, Center for Marine Science, University of North Carolina at Wilmington, Wilmington, N.C. Mallin, M.A., M.R. McIver, H.A. Wells, M.S. Williams, T.E. Lankford and J.F. Merritt. 2003. Environmental Assessment of the Lower Cape Fear River System, 2002-2003. CMS Report No. 03-03, Center for Marine Science, University of North Carolina at Wilmington, Wilmington, N.C. Mallin, M.A., M.R. McIver, S.H. Ensign and L.B. Cahoon. 2004. Photosynthetic and heterotrophic impacts of nutrient loading to blackwater streams. Ecological Applications 14:823-838. Mallin, M.A., M.R. McIver, T.D. Alphin, M.H. Posey and J.F. Merritt. 2005a. Environmental Assessment of the Lower Cape Fear River System, 2003-2004. CMS Report No. 05-02, Center for Marine Science, University of North Carolina at Wilmington, Wilmington, N.C. Mallin, M.A., L.B. Cahoon and M.J. Durako. 2005b. Contrasting food-web support bases for adjoining river-influenced and non-river influenced continental shelf ecosystems. Estuarine, Coastal and Shelf Science 62:55-62. Mallin, M.A., M.R. McIver and J.F. Merritt. 2006. Environmental Assessment of the Lower Cape Fear River System, 2005. CMS Report No. 06-02, Center for Marine Science, University of North Carolina at Wilmington, Wilmington, N.C. U.S. EPA 1997. Methods for the Determination of Chemical Substances in Marine and Estuarine Environmental Matrices, 2nd Ed. EPA/600/R-97/072. National Exposure Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Cincinnati, Ohio. Welschmeyer, N.A. 1994. Fluorometric analysis of chlorophyll a in the presence of chlorophyll b and phaeopigments. Limnology and Oceanography 39:1985-1993. 21 Ta b l e 2 . 1 W a t e r t e m p e r a t u r e ( oC) f o r 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P B B T I C N C F 6 JA N 9. 0 8 . 9 9 . 1 9 . 4 9 . 9 1 0 . 1 1 0 . 5 1 0 . 9 1 1 . 3 1 1 . 6 JA N 9.4 9 . 6 9 . 8 9 . 7 9 . 6 1 0 . 0 FE B 9. 2 9 . 6 9 . 1 1 0 . 0 9 . 7 9 . 4 9 . 8 9 . 5 9 . 3 8 . 8 FE B 8.3 8 . 6 8 . 6 8 . 9 8 . 9 9 . 7 MA R 14 . 6 1 5 . 0 1 4 . 5 1 4 . 2 1 3 . 9 1 3 . 3 1 3 . 3 1 5 . 5 1 5 . 4 1 7 . 7 MA R 15 . 2 1 5 . 6 1 6 . 3 6 . 4 1 6 . 1 1 5 . 4 AP R 18 . 6 1 8 . 9 1 8 . 4 1 8 . 7 1 8 . 0 1 7 . 9 1 7 . 6 1 7 . 2 1 6 . 5 1 7 . 2 AP R 18 . 8 1 9 . 1 1 8 . 5 1 8 . 7 1 8 . 8 1 8 . 9 MA Y 19 . 8 2 0 . 0 2 0 . 2 2 0 . 0 1 9 . 9 1 9 . 6 1 9 . 8 1 9 . 8 1 9 . 8 2 1 . 1 MA Y 19 . 4 1 9 . 3 1 9 . 6 1 9 . 5 1 9 . 6 2 0 . 4 JU N 26 . 1 2 6 . 5 2 6 . 2 2 5 . 9 2 5 . 7 2 5 . 4 2 5 . 5 2 5 . 2 2 4 . 9 2 5 . 6 JU N 26 . 6 2 6 . 2 2 5 . 9 2 5 . 4 2 6 . 1 2 5 . 6 JU L 28 . 3 2 8 . 4 2 8 . 6 2 8 . 8 2 9 . 2 2 8 . 8 2 9 . 2 2 8 . 9 2 8 . 8 3 0 . 3 JU L 27 . 5 2 7 . 5 2 7 . 6 2 7 . 1 2 7 . 6 2 7 . 5 AU G 30 . 9 3 1 . 4 3 1 . 3 3 1 . 7 3 1 . 3 3 1 . 1 3 0 . 9 3 0 . 5 3 0 . 0 3 0 . 5 AU G 30 . 2 3 0 . 3 3 0 . 9 3 1 . 0 3 1 . 1 3 1 . 2 SE P 25 . 0 2 5 . 1 2 5 . 1 2 4 . 8 2 5 . 4 2 5 . 4 2 5 . 7 2 6 . 6 2 6 . 8 2 8 . 2 SE P 25 . 3 2 5 . 2 2 5 . 4 2 4 . 4 2 4 . 8 2 4 . 0 OC T 22 . 8 2 3 . 7 2 3 . 8 2 4 . 1 2 4 . 1 2 4 . 1 2 4 . 6 2 4 . 7 2 4 . 7 2 4 . 0 OC T 23 . 3 2 3 . 3 2 2 . 6 2 2 . 1 2 2 . 7 2 3 . 4 NO V 15 . 4 1 6 . 6 1 6 . 3 1 6 . 2 1 6 . 7 1 7 . 1 1 7 . 1 1 7 . 1 1 7 . 7 1 7 . 3 NO V 14 . 4 1 4 . 6 1 4 . 1 1 3 . 9 1 4 . 3 1 5 . 8 DE C 11 . 3 1 1 . 3 1 1 . 4 1 1 . 8 1 1 . 8 1 2 . 1 1 2 . 2 1 2 . 8 1 2 . 8 1 2 . 5 DE C 10 . 4 1 0 . 4 1 0 . 6 1 0 . 3 1 0 . 4 1 1 . 6 me a n 1 9 . 3 1 9 . 6 1 9 . 5 1 9 . 6 1 9 . 6 1 9 . 5 1 9 . 7 1 9 . 9 1 9 . 8 2 0 . 4 m e a n 1 9 . 1 1 9 . 1 1 9 . 2 1 8 . 1 1 9 . 2 1 9 . 5 st d d e v 7. 2 7 . 2 7 . 3 7 . 2 7 . 2 7 . 1 7 . 1 6 . 9 6 . 8 7 . 1 st d d e v 7.2 7 . 1 7 . 1 7 . 8 7 . 1 6 . 8 ma x 30 . 9 3 1 . 4 3 1 . 3 3 1 . 7 3 1 . 3 3 1 . 1 3 0 . 9 3 0 . 5 3 0 . 0 3 0 . 5 ma x 30 . 2 3 0 . 3 3 0 . 9 3 1 . 0 3 1 . 1 3 1 . 2 mi n 9. 0 8 . 9 9 . 1 9 . 4 9 . 7 9 . 4 9 . 8 9 . 5 9 . 3 8 . 8 min 8.3 8 . 6 8 . 6 6 . 4 8 . 9 9 . 7 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 S C - C H JA N 8. 0 8 . 2 7 . 5 8 . 7 8 . 9 1 0 . 7 1 0 . 5 1 1 . 3 9 . 3 JA N 11 . 2 1 0 . 8 1 2 . 4 1 1 . 4 1 2 . 6 1 2 . 2 JA N 9. 9 9 . 9 1 0 . 2 1 0 . 8 FE B 8. 8 9 . 8 9 . 1 9 . 3 1 0 . 2 9 . 5 9 . 1 9 . 4 9 . 0 FE B 6. 0 5 . 8 4 . 6 4 . 6 6 . 7 6 . 4 FE B 9. 2 9 . 1 8 . 2 9 . 2 1 1 . 7 MA R 12 . 7 1 3 . 8 1 1 . 3 1 3 . 1 1 4 . 7 1 5 . 4 1 4 . 4 1 5 . 9 1 2 . 5 MA R 17 . 5 1 7 . 7 1 8 . 2 1 9 . 2 1 9 . 8 1 8 . 9 MA R 16 . 3 1 6 . 2 1 4 . 9 1 8 . 2 1 5 . 3 AP R 14 . 5 1 6 . 6 1 4 . 6 1 5 . 7 1 8 . 8 1 7 . 2 1 6 . 9 1 8 . 1 1 5 . 7 AP R 14 . 5 1 4 . 9 1 4 . 4 1 5 . 0 1 5 . 5 1 4 . 6 AP R 18 . 4 1 7 . 4 1 2 . 6 1 2 . 6 2 1 . 9 MA Y 19 . 0 1 7 . 5 1 8 . 0 1 8 . 1 1 9 . 0 1 7 . 7 1 7 . 3 1 7 . 3 1 6 . 7 MA Y 17 . 4 1 7 . 5 1 7 . 1 1 6 . 3 1 7 . 1 1 6 . 3 MA Y 20 . 0 1 7 . 4 1 5 . 8 1 7 . 8 2 2 . 8 JU N 21 . 4 2 1 . 8 2 1 2 1 . 5 2 0 . 6 1 8 . 5 2 0 . 0 1 8 . 6 1 8 . 1 JU N 22 . 7 2 2 . 6 2 2 . 5 2 2 . 5 2 2 . 4 2 1 . 3 JU N 25 . 8 2 4 . 0 2 1 . 2 2 3 . 0 2 3 . 6 JU L 25 . 7 2 5 . 0 2 5 . 2 2 6 . 4 2 7 . 1 2 5 . 8 2 5 . 8 2 7 . 1 2 4 . 2 JU L 26 . 1 2 5 . 5 2 6 . 0 2 5 . 5 2 6 . 1 2 5 . 8 JU L 26 . 9 2 6 . 4 2 4 . 8 2 6 . 5 2 9 . 8 AU G 28 . 2 2 6 . 9 2 5 . 8 2 6 . 8 2 6 . 1 2 5 . 6 2 5 . 6 2 4 . 9 2 4 . 5 AU G 23 . 6 2 3 . 6 2 3 . 5 2 3 . 9 2 3 . 8 2 2 . 6 AU G 30 . 8 2 8 . 9 2 6 . 4 2 6 . 7 3 0 . 6 SE P 23 . 0 2 2 . 8 2 2 . 9 2 3 . 0 2 2 . 8 2 2 . 2 2 2 . 8 2 1 . 9 2 1 . 6 SE P 22 . 8 2 2 . 2 2 2 . 6 2 2 . 8 2 2 . 9 2 2 . 1 SE P 23 . 8 2 3 . 8 2 3 . 0 2 4 . 2 2 4 . 2 OC T 20 . 4 1 9 . 9 1 9 . 3 2 1 . 2 2 1 . 1 2 0 . 2 1 8 . 9 2 0 . 7 1 8 . 5 OC T 18 . 3 1 8 . 6 1 8 . 5 1 8 . 6 1 8 . 6 1 7 . 3 OC T 21 . 8 1 9 . 6 1 6 . 6 1 9 . 8 2 3 . 2 NO V 16 . 7 1 5 . 0 1 5 . 4 1 4 . 9 1 6 . 5 1 5 . 1 1 4 . 8 1 5 . 4 1 5 . 1 NO V 9. 3 9 . 5 8 . 9 8 . 9 1 0 . 5 9 . 2 NO V 14 . 2 1 3 . 7 1 3 . 7 1 3 . 3 1 5 . 8 DE C 10 . 1 8 . 3 8 . 6 9 . 3 1 0 . 4 1 0 . 3 9 . 0 1 1 . 8 1 0 . 2 DE C 9. 6 8 . 2 7 . 7 7 . 9 8 . 7 8 . 2 DE C 11 . 5 1 0 . 4 8 . 1 1 1 . 1 1 1 . 5 me a n 1 7 . 4 1 7 . 1 1 6 . 6 1 7 . 3 1 8 . 0 1 7 . 4 1 7 . 1 1 7 . 7 1 6 . 3 m e a n 1 6 . 6 1 6 . 4 1 6 . 4 1 6 . 4 1 7 . 1 1 6 . 2 m e a n 1 9 . 1 1 8 . 1 1 6 . 3 1 7 . 8 2 0 . 9 st d d e v 6. 4 6 . 1 6 . 2 6 . 2 5 . 8 5 . 3 5 . 6 5 . 2 5 . 2 st d d e v 6. 2 6 . 3 6 . 6 6 . 6 6 . 1 6 . 0 st d d e v 6. 7 6 . 4 6 . 0 6 . 1 6 . 3 ma x 28 . 2 2 6 . 9 2 5 . 8 2 6 . 8 2 7 . 1 2 5 . 8 2 5 . 8 2 7 . 1 2 4 . 5 ma x 26 . 1 2 5 . 5 2 6 . 0 2 5 . 5 2 6 . 1 2 5 . 8 ma x 30 . 8 2 8 . 9 2 6 . 4 2 6 . 7 3 0 . 6 mi n 8. 0 8 . 2 7 . 5 8 . 7 8 . 9 9 . 5 9 . 0 9 . 4 9 . 0 mi n 6. 0 5 . 8 4 . 6 4 . 6 6 . 7 6 . 4 mi n 9. 2 9 . 1 8 . 1 9 . 2 1 1 . 5 22 Ta b l e 2 . 2 S a l i n i t y ( p s u ) f o r 2 0 0 6 a t t h e L o w er C a p e F e a r R i v e r P r o g r am e s t u a r i n e s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C F 6 JA N 0. 1 0 . 1 0 . 1 0 . 2 1 . 3 2 . 5 4 . 2 1 2 . 5 1 3 . 6 2 1 . 1 0 . 1 FE B 0. 2 1 . 2 1 . 0 5 . 1 6 . 3 9 . 3 1 5 . 2 2 1 . 5 2 7 . 2 2 4 . 3 0 . 1 MA R 0. 1 1 . 6 5 . 1 9 . 9 1 1 . 0 1 3 . 6 1 8 . 1 2 8 . 6 2 9 . 3 2 6 . 8 0 . 1 AP R 2. 1 6 . 2 6 . 8 1 2 . 1 1 3 . 2 1 4 . 4 1 8 . 7 2 4 . 4 2 8 . 6 2 7 . 9 1 . 7 MA Y 0. 1 0 . 2 1 . 5 6 . 7 7 . 5 8 . 8 1 0 . 4 1 9 . 5 2 1 . 2 2 4 . 6 0 . 3 JU N 5. 0 7 . 5 8 . 6 1 2 . 8 1 4 . 3 1 3 . 7 1 5 . 5 2 1 . 8 2 4 . 8 2 8 . 1 0 . 6 JU L 0. 1 0 . 1 0 . 1 0 . 9 1 . 6 2 . 9 4 . 2 1 2 . 2 1 2 . 9 2 2 . 9 0 . 1 AU G 1. 5 3 . 6 6 . 3 1 0 . 1 1 2 . 3 1 5 . 5 1 8 . 8 2 5 . 4 2 8 . 7 2 9 . 4 3 . 0 SE P 0. 0 0 . 0 0 . 0 0 . 0 0 . 4 1 . 0 1 . 7 6 . 8 9 . 3 1 5 . 8 0 . 0 OC T 0. 1 2 . 0 5 . 5 1 0 . 5 1 1 . 1 1 3 . 6 1 5 . 4 2 2 . 6 2 4 . 0 2 7 . 7 0 . 9 NO V 1. 4 2 . 6 1 . 9 3 . 2 9 . 9 1 3 . 2 2 0 . 8 2 6 . 9 3 3 . 2 2 7 . 6 3 . 9 DE C 0. 0 0 . 0 0 . 1 0 . 1 0 . 1 0 . 6 2 . 1 6 . 6 1 4 . 0 1 3 . 1 0 . 0 me a n 0 . 9 2 . 1 3 . 1 6 . 0 7 . 4 9 . 1 1 2 . 1 1 9 . 1 2 2 . 2 2 4 . 1 0 . 9 st d d e v 1.4 2 . 4 3 . 0 4 . 8 5 . 1 5 . 5 6 . 9 7 . 3 7 . 6 4 . 9 1 . 2 ma x 5. 0 7 . 5 8 . 6 1 2 . 8 1 4 . 3 1 5 . 5 2 0 . 8 2 8 . 6 3 3 . 2 2 9 . 4 3 . 9 mi n 0. 0 0 . 0 0 . 0 0 . 0 0 . 1 0 . 6 1 . 7 6 . 6 9 . 3 1 3 . 1 0 . 0 23 Ta b l e 2 . 3 S p e c i f i c C o n d u c t i v i t y ( m S / c m ) f o r 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P B B T I C N C F 6 JA N 0.1 3 0 . 1 2 0 . 1 3 0 . 3 4 2 . 5 5 4 . 5 9 7 . 5 0 2 0 . 6 7 2 2 . 6 4 3 3 . 7 0 JA N 0. 1 1 0 . 1 8 0 . 1 7 0 . 1 0 0 . 1 2 0 . 1 1 FE B 0.4 7 2 . 3 1 1 . 9 5 9 . 0 7 1 1 . 0 9 1 5 . 3 3 2 5 . 0 0 3 4 . 4 4 4 2 . 5 4 3 8 . 5 0 FE B 0. 1 2 0 . 1 2 0 . 1 4 0 . 1 4 0 . 1 6 0 . 1 8 MA R 0.2 5 3 . 1 1 8 . 9 9 1 6 . 7 0 1 8 . 5 5 2 2 . 5 4 2 9 . 0 4 4 4 . 2 4 4 5 . 1 7 4 1 . 6 7 MA R 0. 1 3 0 . 2 0 0 . 1 6 0 . 1 6 0 . 1 8 0 . 1 9 AP R 4.0 2 1 0 . 7 3 1 1 . 9 1 2 0 . 2 0 2 1 . 9 3 2 3 . 7 4 2 9 . 9 7 3 8 . 3 1 4 4 . 3 3 4 3 . 2 3 AP R 0. 1 5 0 . 2 0 0 . 2 1 0 . 2 0 0 . 2 1 3 . 1 5 MA Y 0.1 4 0 . 4 7 2 . 7 7 1 1 . 6 0 1 2 . 9 6 1 5 . 0 9 1 7 . 6 4 3 0 . 7 3 3 3 . 6 7 3 8 . 6 2 MA Y 0. 1 1 0 . 1 4 0 . 1 4 0 . 1 1 0 . 1 3 0 . 5 8 JU N 8.9 9 1 3 . 0 6 1 4 . 7 7 2 1 . 4 1 2 3 . 6 7 2 2 . 7 4 2 5 . 4 5 3 4 . 6 6 3 8 . 9 9 4 4 . 9 3 JU N 0. 1 4 0 . 3 1 0 . 2 2 0 . 1 5 0 . 2 2 1 . 1 6 JU L 0.1 3 0 . 1 2 0 . 1 3 1 . 7 7 3 . 1 6 5 . 4 0 7 . 6 8 2 0 . 5 7 2 1 . 3 5 3 6 . 4 4 JU L 0. 1 3 0 . 2 5 0 . 1 7 0 . 0 9 0 . 1 3 0 . 1 1 AU G 2.8 3 6 . 6 1 1 1 . 1 2 1 7 . 3 7 2 0 . 7 9 2 5 . 6 0 3 0 . 6 8 4 0 . 0 0 4 2 . 1 8 4 5 . 5 8 AU G 0. 1 2 0 . 1 4 0 . 1 8 0 . 1 7 0 . 1 9 5 . 6 7 SE P 0.0 8 0 . 0 8 0 . 0 9 0 . 0 9 0 . 8 0 1 . 8 9 3 . 2 7 1 1 . 9 0 1 5 . 8 9 2 6 . 0 1 SE P 0. 0 9 0 . 1 2 0 . 1 3 0 . 0 6 0 . 0 8 0 . 0 5 OC T 0.2 6 3 . 7 0 9 . 7 4 1 7 . 8 1 1 8 . 7 9 2 2 . 5 6 2 5 . 2 4 3 5 . 8 0 3 7 . 8 7 4 3 . 0 8 OC T 0. 1 3 0 . 1 7 0 . 1 8 0 . 1 4 0 . 1 8 1 . 6 7 NO V 2.7 3 4 . 8 7 3 . 5 2 5 . 8 8 1 6 . 6 6 2 1 . 8 4 3 3 . 2 0 4 1 . 9 0 5 0 . 6 0 4 2 . 8 7 NO V 0. 1 3 0 . 1 3 0 . 1 6 0 . 1 6 0 . 1 8 7 . 0 1 DE C 0.1 0 0 . 1 0 0 . 1 0 0 . 1 0 0 . 1 1 1 . 1 6 3 . 9 3 1 1 . 5 7 2 3 . 1 1 2 1 . 7 0 DE C 0. 1 1 0 . 1 1 0 . 1 2 0 . 0 8 0 . 1 0 0 . 0 9 me a n 1 . 6 8 3 . 7 7 5 . 4 3 1 0 . 1 9 1 2 . 5 9 1 5 . 2 0 1 9 . 8 8 3 0 . 4 0 3 4 . 8 6 3 8 . 0 3 m e a n 0 . 1 2 0 . 1 7 0 . 1 7 0 . 1 3 0 . 1 6 1 . 6 6 st d d e v 2.5 7 4 . 2 0 5 . 2 3 8 . 0 2 8 . 4 4 9 . 0 0 1 0 . 8 1 1 0 . 9 2 1 0 . 8 5 7 . 2 3 st d d e v 0. 0 1 0 . 0 6 0 . 0 3 0 . 0 4 0 . 0 4 2 . 2 8 ma x 8.9 9 1 3 . 0 6 1 4 . 7 7 2 1 . 4 1 2 3 . 6 7 2 5 . 6 0 3 3 . 2 0 4 4 . 2 4 5 0 . 6 0 4 5 . 5 8 ma x 0. 1 5 0 . 3 1 0 . 2 2 0 . 2 0 0 . 2 2 7 . 0 1 mi n 0.0 8 0 . 0 8 0 . 0 9 0 . 0 9 0 . 1 1 1 . 1 6 3 . 2 7 1 1 . 5 7 1 5 . 8 9 2 1 . 7 0 mi n 0. 0 9 0 . 1 1 0 . 1 2 0 . 0 6 0 . 0 8 0 . 0 5 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 S C - C H JA N 0.0 8 0 . 1 5 0 . 1 6 0 . 3 5 0 . 7 9 0 . 1 2 0 . 1 3 0 . 3 1 0 . 1 6 JA N 0. 1 3 0 . 0 9 0 . 1 3 0 . 1 0 0 . 1 1 0 . 1 3 JA N 0.1 1 0 . 0 9 0 . 0 7 0 . 0 7 0 . 0 0 FE B 0.1 2 0 . 1 7 0 . 1 7 0 . 3 7 1 . 3 3 0 . 1 3 0 . 1 4 0 . 4 8 0 . 1 4 FE B 0. 1 2 0 . 0 9 0 . 1 4 0 . 0 9 0 . 1 1 0 . 1 2 FE B 0.2 0 0 . 1 5 0 . 0 7 0 . 1 3 0 . 5 7 MA R 0.1 1 0 . 1 8 0 . 1 9 0 . 4 6 1 . 3 5 0 . 1 2 0 . 1 4 0 . 5 9 0 . 1 4 MA R 0. 1 2 0 . 0 9 0 . 1 6 0 . 0 9 0 . 1 1 0 . 1 4 MA R 0.1 4 0 . 0 8 0 . 0 6 0 . 1 0 0 . 9 8 AP R 0.0 9 0 . 1 7 0 . 1 8 0 . 6 0 3 . 3 3 0 . 1 6 0 . 1 2 0 . 6 1 0 . 2 2 AP R 0. 1 2 0 . 0 8 0 . 1 7 0 . 0 9 0 . 1 1 0 . 1 5 AP R 0.1 9 0 . 1 0 0 . 0 6 0 . 1 1 1 1 . 6 2 MA Y 0.0 8 0 . 1 4 0 . 1 5 0 . 2 7 1 . 4 1 0 . 1 0 0 . 0 9 0 . 3 0 0 . 1 1 MA Y 0. 0 9 0 . 1 0 0 . 1 0 0 . 0 7 0 . 0 7 0 . 0 7 MA Y 0.1 4 0 . 0 7 0 . 0 6 0 . 1 0 2 . 5 8 JU N 0.0 9 0 . 2 0 0 . 2 0 0 . 6 5 0 . 9 3 0 . 1 9 0 . 1 3 0 . 2 7 0 . 2 2 JU N 0. 1 3 0 . 0 7 0 . 2 2 0 . 0 9 0 . 1 0 0 . 1 5 JU N 0.1 9 0 . 1 0 0 . 0 6 0 . 1 2 2 . 0 2 JU L 0.1 3 0 . 1 6 0 . 2 0 0 . 2 2 2 . 2 3 0 . 1 6 0 . 1 5 0 . 7 9 0 . 2 9 JU L 0. 1 3 0 . 0 6 0 . 1 2 0 . 0 8 0 . 1 2 0 . 1 6 JU L 0.1 1 0 . 0 7 0 . 0 6 0 . 0 9 0 . 4 3 AU G 0.0 9 0 . 1 9 0 . 2 4 0 . 2 8 1 . 4 5 0 . 0 7 0 . 0 9 0 . 3 2 0 . 0 9 AU G 0. 1 2 0 . 0 9 0 . 1 8 0 . 1 3 0 . 1 1 0 . 1 5 AU G 0.1 5 0 . 0 9 0 . 0 6 0 . 1 0 1 1 . 1 9 SE P 0.0 6 0 . 1 2 0 . 1 3 0 . 1 7 0 . 3 9 0 . 0 6 0 . 0 7 0 . 1 3 0 . 0 6 SE P 0. 0 7 0 . 0 6 0 . 0 9 0 . 0 9 0 . 0 9 0 . 0 4 SE P 0.0 5 0 . 0 6 0 . 0 6 0 . 0 6 0 . 0 6 OC T 0.0 6 0 . 1 8 0 . 1 8 0 . 3 1 3 . 1 5 0 . 1 1 0 . 1 4 0 . 9 3 0 . 1 7 OC T 0. 1 2 0 . 0 9 0 . 1 5 0 . 1 0 0 . 1 2 0 . 1 8 OC T 0.1 3 0 . 0 9 0 . 0 7 0 . 1 1 9 . 0 2 NO V 0.0 9 0 . 1 7 0 . 1 8 0 . 2 9 1 . 0 4 0 . 1 1 0 . 1 2 0 . 1 3 0 . 0 6 NO V 0. 1 3 0 . 1 0 0 . 1 5 0 . 1 0 0 . 1 2 0 . 1 7 NO V 0.1 3 0 . 0 9 0 . 0 6 0 . 1 1 6 . 2 1 DE C 0.0 7 0 . 1 3 0 . 1 3 0 . 2 0 0 . 9 0 0 . 1 2 0 . 1 0 0 . 3 4 0 . 0 8 DE C 0. 1 1 0 . 0 8 0 . 1 0 0 . 0 8 0 . 1 0 0 . 1 2 DE C 0.0 9 0 . 0 7 0 . 0 6 0 . 0 8 0 . 0 9 me a n 0 . 0 9 0 . 1 6 0 . 1 7 0 . 3 5 1 . 5 2 0 . 1 2 0 . 1 2 0 . 4 3 0 . 1 5 m e a n 0 . 12 0 . 0 8 0 . 1 4 0 . 0 9 0 . 1 0 0 . 1 3 m e a n 0 . 1 3 0 . 0 9 0 . 0 6 0 . 1 0 3 . 7 3 st d d e v 0.0 2 0 . 0 2 0 . 0 3 0 . 1 4 0 . 8 8 0 . 0 4 0 . 0 2 0 . 2 4 0 . 0 7 st d d e v 0. 0 2 0 . 0 1 0 . 0 4 0 . 0 2 0 . 0 1 0 . 0 4 st d d e v 0.0 4 0 . 0 2 0 . 0 0 0 . 0 2 4 . 3 3 ma x 0.1 3 0 . 2 0 0 . 2 4 0 . 6 5 3 . 3 3 0 . 1 9 0 . 1 5 0 . 9 3 0 . 2 9 ma x 0. 1 3 0 . 1 0 0 . 2 2 0 . 1 3 0 . 1 2 0 . 1 8 ma x 0.2 0 0 . 1 5 0 . 0 7 0 . 1 3 1 1 . 6 2 mi n 0.0 6 0 . 1 2 0 . 1 3 0 . 1 7 0 . 3 9 0 . 0 6 0 . 0 7 0 . 1 3 0 . 0 6 mi n 0. 0 7 0 . 0 6 0 . 0 9 0 . 0 7 0 . 0 7 0 . 0 4 mi n 0.0 5 0 . 0 6 0 . 0 6 0 . 0 6 0 . 0 0 24 Ta b l e 2 . 4 p H f o r 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P B B T I C N C F 6 JA N 6. 8 6 . 6 6 . 8 6 . 7 7 . 0 7 . 2 7 . 4 7 . 8 7 . 9 7 . 8 JA N 7.0 7 . 0 7 . 0 6 . 3 6 . 6 6 . 3 FE B 7. 1 7 . 9 7 . 8 7 . 6 7 . 8 7 . 9 8 . 0 8 . 0 8 . 0 7 . 5 FE B 6.7 6 . 9 6 . 7 6 . 8 6 . 9 6 . 7 MA R 7. 1 7 . 3 7 . 2 7 . 4 7 . 5 7 . 7 7 . 8 8 . 1 8 . 1 7 . 8 MA R 7.0 7 . 1 6 . 8 6 . 8 6 . 9 6 . 8 AP R 7. 4 7 . 6 7 . 4 7 . 5 7 . 7 7 . 8 7 . 8 7 . 9 7 . 9 7 . 5 AP R 7.2 7 . 3 7 . 0 6 . 9 7 . 0 7 . 0 MA Y 6. 6 6 . 9 7 . 1 7 . 2 7 . 4 7 . 5 7 . 6 7 . 9 7 . 9 7 . 6 MA Y 6.7 6 . 8 6 . 8 6 . 5 6 . 7 6 . 8 JU N 7. 1 7 . 2 7 . 1 7 . 3 7 . 5 7 . 5 7 . 7 8 . 0 8 . 0 7 . 7 JU N 6.6 7 . 1 6 . 8 6 . 6 6 . 8 6 . 7 JU L 6. 6 6 . 6 7 . 1 6 . 8 7 . 2 7 . 3 7 . 3 7 . 6 7 . 7 7 . 6 JU L 6.8 7 . 1 7 . 0 6 . 3 6 . 7 6 . 4 AU G 6. 9 6 . 9 6 . 9 7 . 1 7 . 2 7 . 5 7 . 7 7 . 9 7 . 9 7 . 6 AU G 6.7 6 . 8 6 . 8 6 . 8 6 . 7 6 . 8 SE P 6. 1 6 . 2 6 . 2 6 . 1 6 . 4 6 . 7 7 . 2 7 . 3 7 . 5 7 . 3 SE P 6.4 6 . 5 6 . 5 5 . 8 6 . 0 5 . 8 OC T 6. 8 6 . 8 6 . 9 6 . 9 7 . 0 7 . 3 7 . 4 7 . 7 7 . 7 7 . 4 OC T 6.7 6 . 8 6 . 7 6 . 6 6 . 7 6 . 4 NO V 7. 4 7 . 3 7 . 8 7 . 7 7 . 9 7 . 9 8 . 0 8 . 0 8 . 0 7 . 8 NO V 6.6 6 . 9 6 . 8 6 . 8 6 . 9 7 . 0 DE C 6. 5 6 . 5 6 . 8 6 . 5 6 . 7 7 . 1 7 . 1 7 . 6 7 . 8 7 . 6 DE C 6.7 6 . 7 6 . 8 6 . 2 6 . 5 6 . 2 me d i a n 6 . 9 6 . 9 7 . 1 7 . 2 7 . 2 7 . 5 7 . 7 7 . 9 7 . 9 7 . 6 m e d i a n 6 . 7 6 . 9 6 . 8 6 . 6 6 . 7 6 . 7 st d d e v 0. 4 0 . 5 0 . 4 0 . 5 0 . 4 0 . 3 0 . 3 0 . 2 0 . 2 0 . 2 st d d e v 0.2 0 . 2 0 . 1 0 . 3 0 . 3 0 . 3 ma x 7. 4 7 . 9 7 . 8 7 . 7 7 . 9 7 . 9 8 . 0 8 . 1 8 . 1 7 . 8 ma x 7.2 7 . 3 7 . 0 6 . 9 7 . 0 7 . 0 mi n 6. 1 6 . 2 6 . 2 6 . 1 6 . 4 6 . 7 7 . 1 7 . 3 7 . 5 7 . 3 min 6.4 6 . 5 6 . 5 5 . 8 6 . 0 5 . 8 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 S C - C H JA N 5. 4 6 . 7 6 . 7 6 . 6 6 . 7 7 . 1 6 . 9 7 . 4 7 . 1 JA N 6. 9 6 . 4 6 . 4 6 . 1 6 . 7 6 . 9 JA N 6. 1 6 . 0 3 . 9 6 . 3 FE B 6. 5 6 . 8 6 . 5 6 . 5 6 . 6 7 . 2 7 . 0 7 . 6 7 . 2 FE B 6. 7 6 . 4 6 . 4 6 . 1 6 . 7 6 . 8 FE B 6. 5 6 . 3 3 . 9 7 . 3 7 . 3 MA R 6. 1 6 . 6 6 . 4 6 . 4 6 . 6 7 . 3 7 . 0 7 . 3 7 . 0 MA R 6. 9 6 . 6 6 . 6 6 . 2 6 . 9 6 . 9 MA R 6. 6 6 . 2 3 . 9 6 . 2 6 . 3 AP R 6. 0 6 . 7 6 . 4 6 . 4 6 . 5 7 . 6 7 . 1 7 . 4 7 . 2 AP R 6. 5 6 . 5 6 . 5 6 . 2 6 . 8 6 . 8 AP R 6. 9 6 . 5 4 . 0 6 . 9 7 . 1 MA Y 5. 9 6 . 6 6 . 4 6 . 3 6 . 6 6 . 9 6 . 6 7 . 2 6 . 6 MA Y 6. 4 6 . 3 6 . 2 6 . 1 6 . 3 6 . 1 MA Y 6. 2 5 . 7 3 . 9 6 . 8 6 . 9 JU N 5. 9 7 . 0 6 . 3 6 . 3 6 . 5 7 . 7 7 . 1 7 . 1 6 . 9 JU N 6. 6 6 . 5 6 . 6 6 . 3 6 . 9 6 . 9 JU N 6. 8 6 . 5 4 . 2 6 . 6 7 . 0 JU L 6. 6 6 . 5 6 . 4 6 . 2 6 . 8 7 . 6 6 . 9 7 . 7 7 . 2 JU L 7. 0 6 . 4 6 . 4 6 . 2 7 . 0 7 . 0 JU L 6. 3 6 . 0 3 . 9 6 . 6 6 . 8 AU G 6. 1 6 . 7 6 . 4 6 . 2 6 . 6 6 . 3 6 . 5 7 . 2 6 . 6 AU G 6. 9 6 . 8 6 . 7 6 . 3 6 . 7 6 . 8 AU G 6. 4 6 . 1 4 . 0 6 . 8 6 . 4 SE P 4. 3 6 . 1 6 . 2 6 . 0 6 . 3 6 . 0 6 . 0 6 . 3 5 . 5 SE P 5. 7 4 . 8 5 . 7 5 . 9 5 . 9 5 . 9 SE P 5. 7 5 . 5 4 . 0 5 . 9 5 . 9 OC T 4. 8 7 . 0 6 . 6 6 . 7 6 . 9 7 . 1 7 . 2 7 . 6 6 . 3 OC T 6. 5 6 . 2 6 . 2 6 . 0 6 . 6 6 . 7 OC T 6. 5 6 . 2 3 . 9 5 . 9 5 . 8 NO V 5. 6 6 . 6 6 . 5 6 . 4 6 . 7 6 . 8 6 . 6 6 . 4 5 . 8 NO V 6. 2 6 . 2 6 . 2 6 . 2 6 . 6 6 . 6 NO V 6. 0 5 . 7 4 . 0 6 . 5 6 . 0 DE C 4. 8 6 . 5 6 . 5 6 . 4 6 . 5 6 . 9 6 . 7 7 . 3 6 . 6 DE C 6. 1 5 . 6 6 . 0 6 . 0 6 . 3 6 . 5 DE C 5. 8 5 . 5 3 . 8 6 . 2 5 . 9 me d i a n 5 . 9 6 . 7 6 . 4 6 . 4 6 . 6 7 . 1 6 . 9 7 . 3 6 . 8 m e d i a n 6 . 6 6 . 4 6 . 4 6 . 2 6 . 7 6 . 8 m e d i a n 6 . 4 6 . 1 3 . 9 6 . 6 6 . 4 st d d e v 0. 7 0 . 2 0 . 1 0 . 2 0 . 1 0 . 5 0 . 3 0 . 4 0 . 5 st d d e v 0. 4 0 . 5 0 . 3 0 . 1 0 . 3 0 . 3 st d d e v 0. 4 0 . 3 0 . 1 0 . 4 0 . 5 ma x 6. 6 7 . 0 6 . 7 6 . 7 6 . 9 7 . 7 7 . 2 7 . 7 7 . 2 ma x 7. 0 6 . 8 6 . 7 6 . 3 7 . 0 7 . 0 ma x 6. 9 6 . 5 4 . 2 7 . 3 7 . 3 mi n 4. 3 6 . 1 6 . 2 6 . 0 6 . 3 6 . 0 6 . 0 6 . 3 5 . 5 mi n 5. 7 4 . 8 5 . 7 5 . 9 5 . 9 5 . 9 mi n 5. 7 5 . 5 3 . 8 5 . 9 5 . 8 25 Ta b l e 2 . 5 D i s s o l v e d O x y g e n ( m g / l ) f o r 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . T h e N C S t a t e s t a n d a r d i s l i s t e d a b o ve e a c h s t a t i o n . 5. 0 5 . 0 5 . 0 5 . 0 5 . 0 5 . 0 5 . 0 6 . 0 6 . 0 6 . 0 5 . 0 NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P B B T I C N C F 6 JA N 10 . 4 1 0 . 2 1 0 . 2 9 . 6 9 . 7 9 . 7 9 . 8 9 . 8 9 . 8 9 . 0 JA N 11 . 4 1 1 . 2 1 1 . 0 1 0 . 0 1 0 . 3 8 . 6 FE B 11 . 3 1 0 . 4 1 0 . 9 1 0 . 1 1 0 . 7 1 1 . 3 1 0 . 6 1 0 . 6 1 0 . 4 1 1 . 4 FE B 12 . 7 1 2 . 2 1 1 . 8 1 1 . 5 1 1 . 4 1 0 . 1 MA R 8. 2 8 . 2 8 . 5 8 . 4 8 . 8 8 . 3 8 . 9 9 . 1 9 . 0 8 . 0 MA R 10 . 3 9 . 7 8 . 8 8 . 8 8 . 7 9 . 4 AP R 8. 0 8 . 3 7 . 9 8 . 2 8 . 2 8 . 4 8 . 5 8 . 4 8 . 2 7 . 8 AP R 9.9 9 . 5 7 . 9 7 . 8 7 . 7 7 . 8 MA Y 6. 2 6 . 2 6 . 0 6 . 4 6 . 8 7 . 3 7 . 3 7 . 6 7 . 6 6 . 5 MA Y 8.0 7 . 8 7 . 6 5 . 9 6 . 6 6 . 2 JU N 4. 5 4 . 9 5 . 0 6 . 1 6 . 3 6 . 2 6 . 6 6 . 2 6 . 2 4 . 7 JU N 6.8 6 . 0 4 . 8 4 . 5 4 . 3 5 . 9 JU L 4. 9 4 . 9 5 . 2 4 . 2 4 . 7 4 . 7 5 . 4 5 . 8 5 . 9 6 . 5 JU L 6.7 6 . 3 5 . 8 4 . 1 4 . 8 3 . 8 AU G 3. 9 4 . 0 4 . 1 4 . 4 4 . 7 5 . 6 5 . 9 6 . 0 6 . 1 5 . 1 AU G 6.4 5 . 7 4 . 6 4 . 6 4 . 6 4 . 9 SE P 3. 9 4 . 0 4 . 1 3 . 3 3 . 8 3 . 6 4 . 1 4 . 8 5 . 2 4 . 5 SE P 6.9 6 . 1 5 . 7 3 . 7 4 . 0 3 . 0 OC T 5. 3 4 . 9 4 . 5 4 . 5 4 . 6 5 . 1 5 . 3 5 . 6 5 . 8 5 . 3 OC T 7.2 6 . 6 5 . 3 5 . 2 5 . 0 3 . 9 NO V 7. 5 7 . 6 7 . 6 7 . 7 7 . 4 8 . 1 8 . 0 7 . 8 7 . 5 8 . 0 NO V 9.3 9 . 1 9 . 0 9 . 0 9 . 0 8 . 7 DE C 7. 6 7 . 5 7 . 6 7 . 2 7 . 4 7 . 8 8 . 1 8 . 6 8 . 7 8 . 5 DE C 9.6 9 . 3 9 . 1 7 . 2 7 . 9 7 . 0 me a n 6 . 8 6 . 8 6 . 8 6 . 7 6 . 9 7 . 2 7 . 4 7 . 5 7 . 5 7 . 1 m e a n 8 . 8 8 . 3 7 . 6 6 . 9 7 . 0 6 . 6 st d d e v 2. 3 2 . 2 2 . 2 2 . 1 2 . 1 2 . 1 1 . 9 1 . 8 1 . 6 2 . 0 st d d e v 2.0 2 . 1 2 . 3 2 . 5 2 . 4 2 . 3 ma x 11 . 3 1 0 . 4 1 0 . 9 1 0 . 1 1 0 . 7 1 1 . 3 1 0 . 6 1 0 . 6 1 0 . 4 1 1 . 4 ma x 12 . 7 1 2 . 2 1 1 . 8 1 1 . 5 1 1 . 4 1 0 . 1 mi n 3. 9 4 . 0 4 . 1 3 . 3 3 . 8 3 . 6 4 . 1 4 . 8 5 . 2 4 . 5 min 6.4 5 . 7 4 . 6 3 . 7 4 . 0 3 . 0 6. 0 5 . 0 5 . 0 6 . 0 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 S C - C H JA N 8. 8 8 . 8 8 . 7 8 . 4 1 0 . 1 1 1 . 2 1 0 . 4 1 0 . 5 1 0 . 6 JA N 10 . 2 1 0 . 3 7 . 3 7 . 6 1 0 . 1 9 . 9 JA N 9. 0 1 0 . 1 8 . 7 9 . 7 FE B 9. 7 9 . 8 7 . 2 8 . 6 1 0 . 3 1 1 . 4 1 0 . 9 1 0 . 9 1 0 . 5 FE B 11 . 9 1 1 . 9 1 0 . 6 1 0 . 1 1 2 . 6 1 2 . 4 FE B 10 . 9 1 0 . 7 9 . 7 9 . 9 1 1 . 2 MA R 7. 3 8 . 7 4 . 8 6 . 8 9 . 2 1 0 . 2 9 . 4 5 . 0 8 . 6 MA R 8. 5 8 . 5 6 . 1 5 . 4 9 . 0 8 . 0 MA R 8. 2 7 . 8 7 . 3 6 . 3 9 . 2 AP R 6. 9 7 . 9 3 . 8 6 . 2 7 . 8 1 1 . 1 8 . 8 1 2 . 8 6 . 2 AP R 8. 8 9 . 0 7 . 1 6 . 6 1 0 . 2 8 . 2 AP R 7. 5 7 . 8 8 . 1 8 . 1 6 . 6 MA Y 6. 6 6 . 5 4 . 3 4 . 3 7 . 5 8 . 6 7 . 5 7 . 7 7 . 2 MA Y 7. 8 7 . 1 5 . 4 5 . 2 7 . 3 8 . 9 MA Y 6. 3 6 . 9 7 . 3 5 . 4 5 . 8 JU N 4. 6 7 . 0 0 . 4 0 . 4 5 . 2 9 . 1 6 . 9 6 . 3 5 . 5 JU N 6. 9 7 . 0 4 . 4 4 . 2 7 . 6 5 . 6 JU N 5. 0 5 . 6 6 . 0 4 . 2 5 . 5 JU L 1. 3 4 . 1 1 . 0 0 . 9 6 . 0 8 . 7 6 . 1 7 . 2 2 . 3 JU L 6. 5 6 . 6 3 . 1 2 . 5 7 . 5 5 . 7 JU L 3. 6 4 . 4 4 . 3 3 . 3 3 . 8 AU G 1. 8 5 . 1 1 . 4 0 . 8 3 . 4 6 . 2 4 . 8 5 . 5 5 . 7 AU G 6. 9 7 . 1 4 . 3 0 . 9 7 . 2 6 . 0 AU G 3. 7 4 . 8 5 . 8 4 . 6 4 . 0 SE P 0. 8 4 . 2 2 . 8 1 . 8 5 . 2 5 . 9 3 . 3 6 . 3 6 . 1 SE P 3. 6 4 . 3 3 . 1 0 . 6 5 . 7 7 . 1 SE P 3. 6 4 . 7 3 . 7 4 . 9 3 . 1 OC T 4. 3 6 . 1 1 . 3 4 . 2 6 . 8 8 . 0 7 . 3 5 . 6 5 . 5 OC T 8. 1 8 . 2 5 . 8 1 . 1 8 . 6 6 . 2 OC T 3. 6 6 . 6 6 . 6 5 . 2 4 . 7 NO V 5. 6 6 . 3 4 . 6 4 . 7 7 . 5 9 . 3 7 . 9 8 . 3 8 . 2 NO V 10 . 6 1 0 . 2 7 . 9 1 0 . 4 9 . 6 7 . 4 NO V 7. 0 7 . 5 6 . 6 7 . 5 7 . 6 DE C 7. 1 9 . 3 8 . 2 8 . 0 9 . 1 1 0 . 3 1 0 . 2 9 . 5 9 . 7 DE C 9. 2 8 . 5 7 . 9 6 . 5 7 . 8 7 . 6 DE C 5. 0 7 . 3 7 . 5 4 . 5 7 . 3 me a n 5 . 4 7 . 0 4 . 0 4 . 6 7 . 3 9 . 2 7 . 8 8 . 0 7 . 2 m e a n 8 . 3 8 . 2 6 . 1 5 . 1 8 . 6 7 . 8 m e a n 6 . 1 7 . 0 6 . 8 6 . 1 6 . 3 st d d e v 2. 8 1 . 9 2 . 7 2 . 9 2 . 0 1 . 7 2 . 2 2 . 4 2 . 3 st d d e v 2. 1 1 . 9 2 . 1 3 . 2 1 . 8 1 . 9 st d d e v 2. 3 1 . 9 1 . 6 2 . 1 2 . 3 ma x 9. 7 9 . 8 8 . 7 8 . 6 1 0 . 3 1 1 . 4 1 0 . 9 1 2 . 8 1 0 . 6 ma x 11 . 9 1 1 . 9 1 0 . 6 1 0 . 4 1 2 . 6 1 2 . 4 ma x 10 . 9 1 0 . 7 9 . 7 9 . 9 1 1 . 2 mi n 0. 8 4 . 1 0 . 4 0 . 4 3 . 4 5 . 9 3 . 3 5 . 0 2 . 3 mi n 3. 6 4 . 3 3 . 1 0 . 6 5 . 7 5 . 6 mi n 3. 6 4 . 4 3 . 7 3 . 3 3 . 1 26 Ta b l e 2 . 6 F i e l d T u r b i d i t y ( N T U ) f o r 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . T h e N C S t a t e s t a n d a r d f o r L a b T u r b i d i ty i s l i s t e d a b o v e e a c h s t a t i o n . 25 2 5 2 5 2 5 2 5 2 5 2 5 2 5 2 5 2 5 5 0 5 0 5 0 5 0 5 0 5 0 NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P B B T I C N C F 6 JA N 11 1 2 9 2 1 1 8 1 2 9 6 4 5 JA N 13 1 4 1 5 4 9 5 FE B 12 1 5 1 3 1 2 1 4 1 4 8 1 2 1 5 1 3 FE B 141 2 8 6 7 7 MA R 87 8 8 7 7 7 8 1 3 1 0 MA R 86 4 4 5 1 8 AP R 22 1 9 1 7 1 0 1 2 1 1 1 2 1 2 1 4 1 3 AP R 65 8 5 9 1 7 MA Y 19 1 1 2 5 1 4 8 8 7 6 1 0 1 3 MA Y 28 2 4 2 8 1 0 1 6 2 9 JU N 221 4 9 5 7 5 4 4 4 8 JU N 11 1 7 1 7 1 1 1 1 2 3 JU L 18 1 2 1 3 9 1 1 1 0 9 6 4 1 0 JU L 12 1 5 1 9 6 1 4 7 AU G 469 7 5 6 8 5 4 4 9 AU G 10 1 7 8 7 1 2 7 SE P 14 1 2 1 5 1 8 2 9 2 1 1 3 7 6 1 8 SE P 15 1 2 1 3 3 1 0 1 1 OC T 201 0 8 5 5 5 5 6 5 7 OC T 13 1 4 1 3 1 0 1 4 3 2 NO V 11 1 1 1 2 1 0 7 6 6 6 2 1 1 1 NO V 25 2 1 1 1 9 1 0 1 8 DE C 16 1 5 1 4 1 5 3 4 1 7 1 5 9 6 1 0 DE C 23 2 7 2 2 6 1 2 7 me a n 1 8 1 2 1 3 1 1 1 3 1 0 8 7 9 1 1 m e a n 1 5 1 5 1 4 7 1 1 1 5 st d d e v 93 5 5 9 5 3 3 5 3 st d d e v 76 7 3 3 9 ma x 46 1 9 2 5 2 1 3 4 2 1 1 5 1 2 2 1 1 8 ma x 28 2 7 2 8 1 1 1 6 3 2 mi n 87 7 5 5 5 4 4 4 5 min 65 4 3 5 5 50 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 5 0 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 S C - C H JA N 42 1 1 2 4 4 7 6 JA N 31 1 0 6 9 JA N 52 2 4 FE B 54 1 0 2 2 3 7 6 FE B 32 1 1 3 5 FE B 75 2 3 9 MA R 85 1 1 5 5 4 4 2 1 6 MA R 43 1 1 4 4 MA R 53 4 5 1 3 AP R 101 0 2 1 6 6 7 9 1 3 AP R 42 2 2 6 5 AP R 32 1 5 1 7 MA Y 84 1 1 3 1 5 7 1 0 1 5 MA Y 40 1 8 5 6 1 4 2 7 MA Y 45 2 9 1 5 JU N 64 6 9 1 1 4 8 2 3 2 7 JU N 60 6 3 2 3 1 2 JU N 33 1 5 1 5 JU L 66 8 9 2 1 5 1 0 1 1 1 0 JU L 56 1 1 1 6 8 JU L 42 1 5 7 AU G 3 9 6 6 7 1 7 1 1 1 5 1 3 AU G 92 6 1 8 1 0 5 AU G 23 2 7 8 1 0 SE P 36 2 2 5 1 7 8 1 9 1 3 SE P 64 3 4 9 1 5 SE P 94 0 3 8 OC T 44 2 1 5 3 4 9 8 OC T 84 4 5 6 5 OC T 34 3 7 1 9 NO V 10 7 2 3 5 1 8 1 2 2 6 1 9 NO V 44 2 2 4 5 NO V 33 2 1 0 2 9 DE C 43 2 1 4 1 0 4 5 9 DE C 41 0 8 6 5 DE C 33 1 3 1 1 mean 6 5 3 3 6 9 7 1 5 1 3 m e a n 8 4 4 4 8 9 m e a n 4 3 2 1 1 1 4 st d d e v 22 2 3 5 6 3 1 0 6 st d d e v 105 3 5 5 6 st d d e v 2 1 1 2 0 6 ma x 10 1 0 8 9 2 1 1 8 1 2 4 2 2 7 ma x 40 1 8 1 1 1 8 2 3 2 7 ma x 95 4 7 8 2 9 min 32 1 0 2 2 3 5 6 mi n 30 0 0 3 4 min 22 0 3 7 27 Ta b l e 2 . 7 T o t a l S u s p e n d e d S o l i d s ( m g / L ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NAV H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 JA N 9 1 2 9 1 8 1 8 1 4 1 2 7 7 7 JA N 10 1 2 1 2 8 5 FE B 9 1 5 9 1 3 1 2 1 7 8 1 3 2 8 2 6 FE B 88 5 6 7 MA R 9 1 0 1 4 1 8 1 7 1 9 2 1 3 6 1 8 5 5 MA R 11 8 6 8 5 0 AP R 18 1 8 1 5 8 1 9 1 2 1 1 1 2 1 5 1 5 AP R 86 6 1 2 2 3 MA Y 12 1 0 1 2 1 3 1 0 1 0 1 0 1 5 1 6 2 4 MA Y 26 2 2 2 0 2 0 4 1 JU N 141 5 1 4 9 1 1 8 1 0 8 1 2 1 5 JU N 76 1 0 7 2 2 JU L 13 9 7 6 9 8 9 1 3 1 1 2 7 JU L 13 2 4 2 2 1 2 3 AU G 56 1 8 1 5 1 0 1 6 2 3 1 9 2 2 2 8 4 4 AU G 81 4 6 4 7 SE P 14 1 0 9 1 6 7 1 1 6 1 1 7 1 5 4 5 SE P 99 8 9 1 0 OC T 22 9 7 5 5 8 6 8 7 1 4 OC T 56 8 1 0 1 1 NO V 87 8 9 8 6 7 8 1 9 2 0 NO V 12 1 0 6 6 1 1 DE C 13 1 4 1 2 1 4 4 2 1 8 1 4 1 0 1 2 2 0 DE C 21 2 5 1 9 1 1 6 me a n 1 6 1 2 1 1 1 2 2 0 1 3 1 2 1 3 1 6 2 6 m e a n 1 2 1 3 1 1 9 1 6 st d d e v 13 4 3 4 1 8 5 4 8 7 1 4 st d d e v 67 6 4 1 4 ma x 56 1 8 1 5 1 8 7 1 2 3 2 1 3 6 2 8 5 5 ma x 26 2 5 2 2 2 0 5 0 min 87 7 5 5 6 6 7 7 7 mi n 56 5 4 3 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6R C L C O G C O S R BR N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 33 2 1 2 4 5 5 3 JA N 43 2 1 1 0 1 0 JA N 20 0 1 FE B 32 1 0 4 2 2 6 2 FE B 33 1 1 4 3 FE B 32 1 1 MA R 56 2 2 7 3 4 1 4 3 MA R 54 4 2 5 2 MA R 54 5 3 AP R 69 3 5 7 3 8 6 7 AP R 20 0 2 4 2 AP R 31 2 4 MA Y 65 3 3 1 0 6 1 1 1 0 9 MA Y 30 2 2 6 6 1 4 1 6 MA Y 43 2 4 JU N 9 3 1 6 1 0 8 1 6 1 8 1 5 JU N 31 6 4 1 3 6 JU N 34 3 5 JU L 55 1 0 6 9 3 3 5 6 JU L 37 1 3 3 3 7 JU L 45 2 4 AU G 31 2 1 1 6 9 2 4 1 3 1 2 8 AU G 8 2 6 1 7 1 0 3 AU G 22 3 2 9 SE P 3 4 3 2 4 1 5 6 1 8 9 SE P 3 2 3 1 0 1 1 1 6 SE P 64 2 5 OC T 44 4 4 1 0 3 3 6 6 OC T 63 4 5 2 2 OC T 32 2 2 NO V 33 2 2 4 1 2 1 1 1 9 9 NO V 22 2 2 2 2 NO V 22 2 5 DE C 23 2 1 2 9 5 4 6 DE C 41 1 5 4 2 DE C 21 0 2 mean 4 5 5 4 6 7 6 1 0 7 m e a n 6 4 4 5 7 6 m e a n 3 3 2 5 st d d e v 23 5 3 3 7 3 5 3 st d d e v 76 3 4 4 5 st d d e v 11 1 7 ma x 9 1 2 1 6 1 0 1 0 2 4 1 3 1 9 1 5 ma x 30 2 2 1 3 1 7 1 4 1 6 ma x 65 5 2 9 min 22 1 0 2 1 2 4 2 min 20 0 1 2 2 mi n 20 0 1 28 Ta b l e 2 . 8 L i ght A t t e n u a t i o n ( k ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o gra m s t a t i o n s . Eq u i p m e n t p r o b l e m s r e s u l t e d i n d a t a gap s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 B B T JA N 2. 8 8 2 . 9 2 2 . 8 6 4 . 5 0 3 . 9 7 3 . 3 6 2 . 6 6 2 . 0 0 1 . 8 9 1 . 9 9 JA N 2. 1 8 2 . 6 7 2 . 6 7 2 . 4 5 3 . 1 6 2 . 2 9 FE B 2. 6 8 3 . 5 2 2 . 9 8 2 . 8 9 3 . 0 5 2 . 0 5 1 . 9 0 FE B 2. 1 6 2 . 0 5 1 . 9 0 2 . 3 1 2 . 2 4 2 . 2 8 MA R MA R 2. 0 3 AP R 2. 9 7 2 . 8 8 3 . 2 6 2 . 0 1 1 . 6 7 1 . 9 0 1 . 4 3 1 . 4 0 1 . 2 6 1 . 2 7 AP R 2. 1 0 2 . 2 0 3 . 1 5 2 . 9 5 4 . 6 4 3 . 0 5 MA Y 3. 6 4 3 . 6 1 3 . 6 0 3 . 1 4 2 . 7 4 2 . 8 1 2 . 6 0 1 . 7 3 1 . 8 3 2 . 1 5 MA Y 3. 5 4 3 . 3 2 3 . 6 3 3 . 8 9 6 . 7 2 3 . 8 5 JU N 2. 8 9 3 . 4 1 2 . 2 3 1 . 7 8 1 . 5 0 JU N 2. 2 2 JU L 4. 0 7 3 . 3 3 2 . 6 9 3 . 5 0 3 . 1 4 3 . 5 6 2 . 4 0 2 . 3 1 1 . 8 2 1 . 7 8 JU L AU G 2. 9 1 AU G 2. 3 5 2 . 5 7 2 . 8 3 2 . 4 8 3 . 2 6 3 . 0 8 SE P SE P OC T OC T NO V NO V DE C DE C me a n 3 . 1 9 3 . 2 8 2 . 9 4 2 . 9 7 2 . 6 8 2 . 9 1 2 . 2 3 1 . 8 6 1. 7 0 2 . 0 0 m e a n 2 . 3 7 2 . 5 6 2 . 8 4 2 . 8 2 4 . 0 0 2 . 9 1 st d d e v 0 . 5 0 0 . 2 8 0 . 4 3 0 . 9 1 0 . 8 6 0 . 6 4 0 . 4 5 0 . 3 4 0 .2 6 0 . 4 9 s t d d e v 0 . 4 9 0 . 4 4 0 . 5 7 0 . 5 8 1 . 5 6 0 . 5 9 ma x 4 . 0 7 3 . 6 1 3 . 6 0 4 . 5 0 3 . 9 7 3 . 5 6 2 . 6 6 2 . 3 1 1 . 8 9 2 . 9 1 m a x 3 . 5 4 3 . 3 2 3 . 6 3 3 . 8 9 6 . 7 2 3 . 8 5 mi n 2 . 6 8 2 . 8 8 2 . 2 3 1 . 7 8 1 . 5 0 1 . 9 0 1 . 4 3 1 . 4 0 1 . 2 6 1 . 2 7 m i n 2 . 0 3 2 . 0 5 1 . 9 0 2 . 3 1 2 . 2 4 2 . 2 8 29 Ta b l e 2 . 9 T o t a l N i t r o g e n ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 JA N 1, 0 0 0 8 6 0 1 , 1 0 0 1 , 5 2 0 1 , 6 9 0 1 , 0 2 0 1 , 0 0 0 7 8 0 1 , 7 7 0 1 , 2 1 0 JA N 1, 0 6 0 1 , 2 3 0 1 , 4 8 0 1 , 5 8 0 9 8 0 FE B 1, 1 8 0 8 8 0 1 , 0 0 0 9 5 0 1 , 3 2 0 1 , 0 5 0 8 1 0 7 2 0 6 2 0 4 7 0 FE B 1, 0 3 0 1 , 0 7 0 1 , 3 3 0 1 , 0 9 0 1 , 1 0 0 MA R 1, 3 0 0 1 , 4 2 0 1 , 3 5 0 8 6 0 8 1 0 1 , 1 7 0 4 4 0 1 9 0 1 9 0 2 8 0 MA R 1, 1 9 0 1 , 4 7 0 9 1 0 1 , 0 4 0 1 , 1 8 0 AP R 1, 5 2 0 1 , 2 1 0 1 , 1 0 0 1 , 0 9 0 1 , 1 2 0 1 , 2 1 0 7 6 0 1 , 2 0 0 4 0 0 5 , 3 1 0 AP R 1, 3 1 0 1 , 6 9 0 1 , 4 6 0 1 , 4 0 0 1 , 1 5 0 MA Y 1, 0 8 0 1 , 2 0 0 1 , 3 1 0 1 , 1 2 0 1 , 0 6 0 1 , 2 0 0 1 , 1 3 0 7 6 0 7 3 0 8 1 0 MA Y 1, 0 8 0 1 , 1 1 0 1 , 4 6 0 1 , 3 5 0 1 , 2 4 0 JU N 1, 1 7 0 1 , 1 9 0 8 9 0 9 0 0 9 5 0 9 7 0 8 1 0 2 8 0 1 9 0 1 9 0 JU N 1, 4 3 0 1 , 8 4 0 1 , 6 2 0 1 , 4 4 0 1 , 1 2 0 JU L 78 0 1 , 2 0 0 1 , 1 6 0 1 , 3 3 0 1 , 4 2 0 1 , 1 3 0 1 , 2 0 0 1 , 0 8 0 7 7 0 6 5 0 JU L 1, 5 7 0 1 , 0 0 0 1 , 9 5 0 1 , 5 0 0 1 , 6 4 0 AU G 1, 7 6 0 1 , 0 3 0 1 , 0 6 0 1 , 1 2 0 1 , 0 2 0 1 , 0 1 0 6 6 0 3 1 0 3 2 0 2 3 0 AU G 77 0 8 5 0 1 , 6 1 0 1 , 3 7 0 9 3 0 SE P 1, 3 9 0 1 , 0 6 0 1 , 0 3 0 1 , 5 6 0 1 , 3 7 0 1 , 1 8 0 8 2 0 9 6 0 9 6 0 1 , 1 4 0 SE P 1, 1 0 0 9 9 0 8 7 0 1 , 0 9 0 1 , 4 6 0 OC T 56 0 5 9 0 5 3 0 4 7 0 4 2 0 4 0 0 3 9 0 3 2 0 3 0 0 2 2 0 OC T 96 0 1 , 5 6 0 2 , 3 3 0 6 9 0 3 2 0 NO V 2, 4 8 0 1 , 7 6 0 1 , 2 6 0 1 , 4 3 0 1 , 4 1 0 3 8 0 3 2 0 1 , 0 9 0 2 0 0 2 6 0 NO V 1, 8 4 0 1 , 8 9 0 2 , 3 3 0 2 , 2 8 0 1 , 9 3 0 DE C 1, 8 4 0 1 , 7 4 0 2 , 0 2 0 1 , 7 1 0 1 , 5 3 0 2 , 1 8 0 2 , 0 6 0 2 , 4 8 0 3 5 0 3 8 0 DE C 2, 5 2 0 2 , 9 2 0 2 , 2 3 0 2 , 3 4 0 2 , 4 0 0 me a n 1 , 3 3 8 1 , 1 7 8 1 , 1 5 1 1 , 1 7 2 1 , 1 7 7 1 , 0 7 5 8 6 7 8 4 8 5 6 7 9 2 9 m e a n 1 , 3 2 2 1 , 4 6 8 1 , 6 3 2 1 , 4 3 1 1 , 2 8 8 st d d e v 49 3 3 2 7 3 3 4 3 3 9 3 3 7 4 3 2 4 4 7 5 9 6 4 3 8 1 , 3 6 4 st d d e v 45 6 5 5 2 4 7 5 4 5 8 5 0 5 ma x 2, 4 8 0 1 , 7 6 0 2 , 0 2 0 1 , 7 1 0 1 , 6 9 0 2 , 1 8 0 2 , 0 6 0 2 , 4 8 0 1 , 7 7 0 5 , 3 1 0 ma x 2, 5 2 0 2 , 9 2 0 2 , 3 3 0 2 , 3 4 0 2 , 4 0 0 mi n 56 0 5 9 0 5 3 0 4 7 0 4 2 0 3 8 0 3 2 0 1 9 0 1 9 0 1 9 0 mi n 77 0 6 9 0 8 5 0 8 7 0 3 2 0 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 1, 5 0 0 1 , 5 8 0 8 4 0 1 , 5 0 0 1 , 4 2 0 1 , 1 7 0 1 , 3 5 0 1 , 1 8 0 9 1 0 JA N 2,0 4 0 1 , 6 8 0 1 , 3 7 0 7 4 0 1 , 2 6 0 1 , 3 4 0 JA N 1,0 6 0 8 3 0 1 , 7 8 0 1 , 0 5 0 FE B 1, 3 4 0 1 , 7 3 0 7 3 0 9 8 0 1 , 7 2 0 6 2 0 1 , 0 8 0 3 , 4 6 0 7 7 0 FE B 1,1 6 0 1 , 4 0 0 1 , 1 6 0 7 6 0 1 , 0 5 0 1 , 1 2 0 FE B 1,3 9 0 1 , 4 4 0 9 2 0 8 6 0 MA R 1, 3 1 0 1 , 2 1 0 7 0 0 7 4 0 1 , 0 3 0 5 6 0 1 , 0 6 0 1 1 , 5 4 0 7 9 0 MA R 1,3 9 0 1 , 0 0 0 1 , 0 1 0 5 9 0 6 4 0 7 8 0 MA R 79 0 1 , 0 2 0 1 , 2 6 0 1 , 2 8 0 AP R 88 0 1 , 3 8 0 1 , 0 4 0 1 , 1 6 0 1 , 3 5 0 8 2 0 1 , 0 9 0 1 2 , 7 8 0 9 8 0 AP R 2,0 5 0 1 , 5 2 0 9 , 5 0 0 1 , 2 9 0 8 8 0 6 6 0 AP R 1,3 0 0 8 5 0 1 , 1 8 0 4 , 8 1 0 MA Y 1, 6 2 0 9 9 0 8 4 0 9 2 0 7 2 0 7 9 0 9 6 0 1 , 5 0 0 6 0 0 MA Y 39 0 1 , 6 4 0 1 , 0 3 0 1 , 0 3 0 5 6 0 1 , 2 0 0 MA Y 1,3 4 0 9 9 0 1 , 0 3 0 9 8 0 JU N 1, 5 5 0 1 , 2 8 0 1 , 4 0 0 1 , 1 7 0 1 , 0 0 0 1 , 0 2 0 1 , 3 7 0 5 , 1 1 0 3 , 9 4 0 JU N 1,0 7 0 1 , 1 5 0 1 , 1 7 0 9 3 0 1 , 1 6 0 7 3 0 JU N 78 0 1 , 0 0 0 1 , 3 4 0 1 , 0 2 0 JU L 1, 8 2 0 2 , 3 4 0 2 2 0 1 , 5 6 0 1 , 0 5 0 9 9 0 2 , 2 1 0 7 , 0 3 0 1 , 3 9 0 JU L 90 0 1 , 3 0 0 7 5 0 1 , 2 2 0 1 , 2 1 0 1 , 0 5 0 JU L 1,6 7 0 2 , 0 6 0 1 , 6 2 0 1 , 0 6 0 AU G 1, 7 0 0 1 , 3 4 0 1 , 3 0 0 1 , 6 0 0 1 , 3 0 0 1 , 0 7 0 1 , 4 4 0 1 , 7 6 0 6 5 0 AU G 1,2 5 0 1 , 0 3 0 1 , 6 4 0 1 , 9 0 0 1 , 2 3 0 7 9 0 AU G 90 0 8 5 0 1 , 1 0 0 7 1 0 SE P 1, 8 0 0 1 , 3 6 0 2 , 0 3 0 1 , 0 8 0 2 , 0 1 0 1 , 4 1 0 1 , 5 7 0 1 , 7 5 0 9 7 0 SE P 1,9 9 0 1 , 5 7 0 1 , 0 0 0 1 , 5 0 0 1 , 4 9 0 1 , 4 8 0 SE P 1,3 2 0 1 , 3 5 0 1 , 2 0 0 7 4 0 OC T 1, 4 2 0 4 4 0 2 2 0 6 0 0 1 , 7 3 0 1 , 1 2 0 2 , 3 7 0 1 , 9 8 0 1 , 2 3 0 OC T 1,0 0 0 7 2 0 2 8 0 2 3 0 4 3 0 2 6 0 OC T 27 0 4 4 0 2 2 0 1 , 0 6 0 NO V 1, 8 1 0 1 , 5 3 0 1 , 8 2 0 2 , 5 6 0 1 , 1 3 0 2 , 2 8 0 2 , 3 1 0 3 , 3 7 0 2 , 3 0 0 NO V 2,5 7 0 1 , 6 1 0 1 , 2 5 0 2 , 0 6 0 2 , 4 0 0 1 , 2 0 0 NO V 32 0 1 , 7 7 0 2 , 2 0 0 1 , 5 1 0 DE C 2, 3 0 0 2 , 2 6 0 2 , 0 2 0 2 , 8 5 0 2 , 2 6 0 1 , 9 1 0 1 , 4 9 0 2 , 9 4 0 2 , 3 6 0 DE C 2,5 7 0 1 , 7 6 0 3 5 0 1 , 8 6 0 1 , 7 9 0 2 , 2 0 0 DE C 1,3 8 0 2 , 1 4 0 2 , 1 0 0 1 , 3 4 0 me a n 1 , 5 8 8 1 , 4 5 3 1 , 0 9 7 1 , 3 9 3 1 , 3 9 3 1 , 1 4 7 1 , 5 2 5 4 , 5 3 3 1 , 4 0 8 m e a n 1 ,5 3 2 1 , 3 6 5 1 , 7 0 9 1 , 1 7 6 1 , 1 7 5 1 , 0 6 8 m e a n 1 , 0 4 3 1 , 2 2 8 1 , 3 2 9 1 , 3 6 8 st d d e v 33 5 4 9 1 6 0 2 6 5 9 4 3 7 4 8 6 4 8 2 3 , 7 7 6 9 4 8 st d d e v 66 6 3 1 2 2 , 3 7 8 5 4 6 5 2 5 4 7 1 st d d e v 42 2 5 0 8 5 1 8 1 , 0 6 2 ma x 2, 3 0 0 2 , 3 4 0 2 , 0 3 0 2 , 8 5 0 2 , 2 6 0 2 , 2 8 0 2 , 3 7 0 1 2 , 7 8 0 3 , 9 4 0 ma x 2,5 7 0 1 , 7 6 0 9 , 5 0 0 2 , 0 6 0 2 , 4 0 0 2 , 2 0 0 ma x 1,6 7 0 2 , 1 4 0 2 , 2 0 0 4 , 8 1 0 mi n 88 0 4 4 0 2 2 0 6 0 0 7 2 0 5 6 0 9 6 0 1 , 1 8 0 6 0 0 mi n 39 0 7 2 0 2 8 0 2 3 0 4 3 0 2 6 0 mi n 27 0 4 4 0 2 2 0 7 1 0 30 Ta b l e 2 . 1 0 N i t r a t e / N i t r i t e ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r s t a t i o n s . T h e N C S t a t e s t a n d a r d ( 1 0 . 0 m g / L ) o n l y a f f e c t s N C 1 1 b e c a u s e o f it s c l a s s i f i c a t i o n a s a w a t e r s u p p l y . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 B B T JA N 30 0 1 1 0 3 5 0 3 0 2 4 0 4 0 1 6 0 3 0 1 4 0 5 1 0 JA N 22 0 2 5 0 4 1 0 5 1 0 1 4 0 5 0 5 FE B 20 0 1 3 0 2 1 0 1 1 0 1 1 0 1 2 0 1 1 0 7 0 6 0 5 0 FE B 42 0 4 2 0 3 0 0 3 0 0 1 7 0 5 7 6 MA R 46 0 4 4 0 4 6 0 3 0 0 2 5 0 2 4 0 2 1 0 1 3 1 3 1 3 MA R 54 0 5 4 0 3 0 0 4 3 0 1 1 0 4 8 8 AP R 45 0 4 2 0 4 0 0 3 4 0 2 8 0 2 8 0 2 0 0 1 3 0 7 0 4 0 AP R 61 0 6 2 0 5 3 0 4 7 0 1 2 0 MA Y 29 0 2 7 0 3 8 0 2 8 0 1 3 0 2 2 0 3 4 0 1 1 0 1 2 0 1 1 0 MA Y 38 0 4 1 0 5 7 0 4 2 0 1 2 0 4 6 5 JU N 24 0 1 6 0 1 4 0 1 1 0 1 1 0 8 0 6 0 1 3 1 3 1 3 JU N 68 0 7 2 0 5 5 0 4 6 0 1 9 0 4 5 4 JU L 41 0 4 1 0 4 6 0 3 5 0 3 5 0 2 9 0 2 7 0 1 9 0 1 6 0 1 3 JU L 52 0 4 9 0 5 0 0 3 8 0 2 4 0 1 7 5 AU G 27 0 3 3 0 3 1 0 2 8 0 2 7 0 1 7 0 1 5 0 8 0 4 0 1 3 AU G 49 0 4 3 0 3 5 0 3 9 0 2 3 0 4 8 8 SE P 90 6 0 1 3 0 6 0 7 0 8 0 1 2 0 1 6 0 1 6 0 1 4 0 SE P 20 0 1 9 0 1 7 0 9 0 6 0 1 8 0 OC T 36 0 3 9 0 3 3 0 2 7 0 2 2 0 2 0 0 1 9 0 1 2 0 1 0 0 1 0 OC T 76 0 1 3 6 0 5 3 0 4 9 0 1 2 0 5 2 3 NO V 38 0 2 6 0 3 6 0 2 3 0 2 1 0 1 8 0 1 2 0 9 0 1 0 6 0 NO V 64 0 6 9 0 4 3 0 4 8 0 2 3 0 5 2 3 DE C 34 0 3 4 0 3 2 0 3 1 0 2 3 0 2 8 0 2 6 0 2 8 0 1 5 0 1 8 0 DE C 42 0 4 2 0 4 3 0 3 4 0 3 0 0 3 0 3 me a n 31 6 2 7 7 3 2 1 2 2 3 2 0 6 1 8 2 1 8 3 1 0 7 8 6 9 6 me a n 49 0 5 4 5 4 2 3 3 9 7 1 6 9 4 2 5 st d d e v 10 3 1 2 7 1 0 5 1 0 9 8 0 8 2 7 6 7 4 5 7 1 3 6 st d d e v 16 5 2 8 9 1 1 8 1 1 0 6 7 1 3 4 ma x 46 0 4 4 0 4 6 0 3 5 0 3 5 0 2 9 0 3 4 0 2 8 0 1 6 0 5 1 0 ma x 76 0 1 , 3 6 0 5 7 0 5 1 0 3 0 0 5 7 6 mi n 90 6 0 1 3 0 3 0 7 0 4 0 6 0 1 3 1 0 1 0 mi n 20 0 1 9 0 1 7 0 9 0 6 0 1 7 5 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6R C L C O G C O S R BR N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 19 0 5 1 0 9 0 8 9 0 7 7 0 3 8 0 4 2 0 3 4 0 1 6 0 JA N 1, 1 1 0 7 9 0 4 8 0 9 0 6 5 0 4 1 0 JA N 80 4 0 4 3 0 4 4 0 FE B 80 5 2 0 1 7 0 5 6 0 6 0 0 2 5 0 3 3 0 4 3 0 6 0 FE B 41 0 4 2 0 3 7 0 6 0 3 0 0 3 7 0 FE B 36 0 5 1 0 2 5 1 1 0 MA R 13 4 0 1 3 4 0 1 3 1 3 8 0 2 5 0 1 3 MA R 46 0 3 9 0 1 2 0 3 0 1 3 0 1 3 0 MA R 18 0 2 3 0 1 3 7 0 AP R 37 0 2 1 0 6 0 3 7 0 9 0 7 0 1 6 0 1 1 6 1 0 9 0 AP R 98 0 3 5 0 7 0 3 0 1 3 0 5 0 AP R 27 0 1 5 0 6 0 3 6 4 0 MA Y 80 6 0 1 3 3 0 1 6 0 4 0 7 0 3 3 0 4 0 MA Y 60 5 0 1 3 1 3 5 0 1 3 0 MA Y 22 0 1 5 0 5 0 9 0 JU N 10 0 3 0 0 1 3 1 3 7 0 1 8 0 2 5 0 3 1 0 0 1 9 3 0 JU N 14 0 1 2 0 1 3 1 3 4 0 3 0 JU N 13 0 1 1 0 3 0 1 3 0 JU L 10 0 1 9 0 3 0 7 0 2 0 6 0 1 0 0 0 5 7 2 0 8 0 JU L 200 4 0 1 3 5 0 1 8 0 7 0 JU L 18 0 1 5 0 3 0 8 0 AU G 13 1 4 0 1 3 1 3 1 3 7 2 1 4 0 3 6 0 5 0 AU G 15 0 1 3 0 4 0 1 3 3 0 9 0 AU G 15 0 1 0 0 2 6 0 6 0 SE P 13 6 0 2 3 0 8 0 7 1 0 2 1 0 1 7 0 6 5 0 7 0 SE P 29 0 1 7 0 1 3 1 3 9 0 1 8 0 SE P 12 0 1 5 0 1 3 4 0 OC T 10 2 4 0 2 0 4 0 0 5 3 0 1 2 0 1 3 7 0 1 7 8 0 3 0 OC T 80 0 5 2 0 8 0 3 0 2 3 0 6 0 OC T 70 2 4 0 1 0 1 6 0 NO V 21 0 1 3 0 2 0 3 6 0 2 3 0 2 8 0 3 1 0 7 7 0 2 0 0 NO V 87 0 5 1 0 5 0 6 0 2 0 0 1 0 NO V 12 0 1 7 0 1 0 1 1 0 DE C 10 2 6 0 3 2 0 1 2 5 0 9 6 0 5 1 0 2 9 0 8 4 0 6 0 DE C 77 0 4 6 0 1 5 0 6 0 3 9 0 3 0 0 DE C 28 0 2 4 0 1 0 4 0 me a n 99 2 2 2 8 3 3 4 0 3 4 7 1 8 2 3 8 3 2 , 1 8 2 2 3 2 me a n 52 0 3 2 9 1 1 8 3 9 2 0 2 1 5 3 me a n 18 0 1 8 7 7 8 4 1 4 st d d e v 10 5 1 5 3 9 8 3 7 9 3 3 0 1 4 5 3 8 0 3 , 2 3 4 5 1 5 st d d e v 35 2 2 2 0 1 4 6 2 4 1 7 0 1 3 0 st d d e v 84 1 1 3 1 2 5 9 7 8 ma x 37 0 5 2 0 3 2 0 1 , 2 5 0 9 6 0 5 1 0 1 , 3 7 0 1 1 , 6 1 0 1 , 9 3 0 ma x 1, 1 1 0 7 9 0 4 8 0 9 0 6 5 0 4 1 0 ma x 36 0 5 1 0 4 3 0 3 , 6 4 0 mi n 10 4 0 1 3 1 3 1 3 1 3 7 0 2 5 0 1 3 mi n 60 4 0 1 3 1 3 3 0 1 0 mi n 70 4 0 1 0 4 0 31 Ta b l e 2 . 1 1 A m m o n i u m ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 B B T JA N 70 6 0 6 0 7 0 9 0 1 0 0 9 0 6 0 6 0 3 0 JA N 40 9 0 8 0 5 0 3 0 FE B 70 6 0 5 0 8 0 2 4 0 6 0 4 0 2 0 1 0 1 0 FE B 40 3 0 3 0 4 0 6 0 4 8 MA R 10 0 2 0 1 2 0 1 1 0 1 2 0 1 0 0 3 0 2 0 2 0 2 0 MA R 20 6 0 5 0 7 0 6 0 4 5 AP R 13 0 1 3 0 1 1 0 1 0 0 1 7 0 7 0 3 0 2 0 1 0 1 0 AP R 30 5 0 1 1 0 6 0 4 0 1 0 7 MA Y 11 0 1 3 0 1 2 0 1 1 0 1 2 0 1 2 0 1 2 0 4 0 4 0 4 0 MA Y 80 1 1 0 1 0 0 1 1 0 4 0 9 9 JU N 13 0 1 2 0 1 1 0 1 1 0 1 1 0 1 1 0 5 0 1 0 1 0 1 0 JU N 60 2 6 0 1 8 0 1 7 0 2 0 1 2 9 JU L 50 5 0 6 0 6 0 5 0 6 0 7 0 2 0 2 0 5 JU L 40 9 0 7 0 5 0 4 0 AU G 20 2 0 1 0 2 0 2 0 2 0 1 0 5 5 5 AU G 20 3 0 4 0 4 0 3 0 6 8 SE P 30 4 0 4 0 4 0 5 0 5 0 6 0 5 0 3 0 5 0 SE P 60 1 0 0 1 0 0 5 0 3 0 1 7 OC T 60 7 0 9 0 8 0 7 0 8 0 6 0 4 0 4 0 2 0 OC T 30 5 0 8 0 7 0 4 0 5 7 NO V 70 5 0 6 0 7 0 6 0 4 0 2 0 1 0 5 5 NO V 30 5 0 7 0 6 0 6 0 7 0 DE C 30 3 0 3 0 4 0 4 0 4 0 4 0 3 0 2 0 5 DE C 60 6 0 7 0 4 0 3 0 me a n 7 3 6 5 7 2 7 4 9 5 7 1 5 2 2 7 2 3 1 8 m e a n 4 3 8 2 8 2 6 8 4 0 7 1 st d d e v 36 3 9 3 6 2 9 6 0 3 0 3 0 1 6 1 6 1 5 st d d e v 18 5 9 3 8 3 6 1 3 3 3 ma x 13 0 1 3 0 1 2 0 1 1 0 2 4 0 1 2 0 1 2 0 6 0 6 0 5 0 ma x 80 2 6 0 1 8 0 1 7 0 6 0 1 2 9 mi n 20 2 0 1 0 2 0 2 0 2 0 1 0 5 5 5 mi n 20 3 0 3 0 4 0 2 0 1 7 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 40 3 0 1 0 2 0 3 0 3 0 4 0 5 0 4 0 JA N 120 3 0 4 0 3 0 4 0 2 5 0 JA N 30 1 0 2 0 7 0 FE B 60 1 9 0 4 0 4 0 4 0 5 0 4 0 1 9 7 0 5 0 FE B 50 2 0 2 0 2 0 2 0 1 4 0 FE B 60 4 0 3 0 2 6 0 MA R 60 1 0 0 1 0 3 0 4 0 3 0 2 0 6 5 1 0 1 0 MA R 80 5 0 2 0 3 0 4 0 5 0 MA R 50 4 0 7 0 6 6 0 AP R 50 8 0 3 0 5 0 7 0 4 0 4 0 1 6 0 5 0 AP R 40 4 0 4 0 5 0 3 0 2 0 AP R 80 5 0 7 0 2 4 0 MA Y 110 5 0 3 0 5 0 8 0 8 0 5 0 1 4 0 8 0 MA Y 14 0 2 1 0 5 0 4 0 3 0 6 0 MA Y 50 4 0 3 0 1 8 0 JU N 80 5 0 6 0 1 4 0 1 0 0 7 0 5 0 2 1 0 3 6 0 JU N 70 0 5 0 1 8 0 4 0 5 0 5 0 JU N 40 6 0 1 5 0 2 8 0 JU L 80 5 0 8 0 1 0 0 3 0 5 0 6 0 1 5 0 3 0 JU L 20 2 0 7 0 3 0 4 0 4 0 JU L 60 3 0 4 0 1 2 0 AU G 40 5 0 1 9 0 9 0 6 0 5 0 5 0 1 1 0 5 0 AU G 40 3 0 2 1 0 2 8 0 6 0 4 0 AU G 20 1 0 4 0 3 0 SE P 10 0 3 0 5 0 9 0 6 0 8 0 1 2 0 6 0 5 0 SE P 90 4 0 5 0 7 0 1 3 0 6 0 SE P 20 2 0 2 0 9 0 OC T 10 0 5 0 4 0 7 0 1 0 0 7 0 8 0 8 0 4 0 OC T 40 3 0 8 0 4 0 4 0 2 0 OC T 60 3 0 3 0 1 4 0 NO V 10 1 0 1 0 2 0 3 0 4 0 2 0 6 0 4 0 NO V 60 1 0 5 1 0 3 0 1 0 NO V 20 1 0 1 0 1 7 0 DE C 15 0 2 0 1 0 5 0 9 0 3 7 0 4 0 3 0 2 0 DE C 130 2 0 5 0 4 0 1 4 0 7 0 DE C 30 1 0 1 0 6 0 me a n 7 3 5 9 4 7 6 3 6 1 8 0 5 1 7 9 4 6 8 m e a n 1 2 6 4 6 6 8 5 7 5 4 6 8 m e a n 4 3 2 9 4 3 1 9 2 st d d e v 36 4 6 4 8 3 5 2 6 8 9 2 6 1 7 9 9 9 0 st d d e v 177 5 1 6 1 6 9 3 8 6 4 st d d e v 19 1 7 3 7 1 6 1 ma x 15 0 1 9 0 1 9 0 1 4 0 1 0 0 3 7 0 1 2 0 6 5 1 0 3 6 0 ma x 70 0 2 1 0 2 1 0 2 8 0 1 4 0 2 5 0 ma x 80 6 0 1 5 0 6 6 0 mi n 10 1 0 1 0 2 0 3 0 3 0 2 0 3 0 1 0 mi n 20 1 0 5 1 0 2 0 1 0 mi n 20 1 0 1 0 3 0 32 Ta b l e 2 . 1 2 T o t a l K j e l d a h l N i t r o g e n ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 JA N 70 0 7 5 0 7 5 0 1 , 4 9 0 1 , 4 5 0 9 8 0 8 4 0 7 5 0 1 , 6 3 0 7 0 0 JA N 84 0 9 8 0 1 , 0 7 0 1 , 0 7 0 8 4 0 FE B 98 0 7 5 0 7 9 0 8 4 0 1 , 2 1 0 9 3 0 7 0 0 6 5 0 5 6 0 4 2 0 FE B 61 0 6 5 0 1 , 0 3 0 7 9 0 9 3 0 MA R 84 0 9 8 0 8 9 0 5 6 0 5 6 0 9 3 0 2 3 0 1 9 0 1 9 0 2 8 0 MA R 65 0 9 3 0 6 1 0 6 1 0 1 , 0 7 0 AP R 1,0 7 0 7 9 0 7 0 0 7 5 0 8 4 0 9 3 0 5 6 0 1 , 0 7 0 3 3 0 5 , 2 7 0 AP R 70 0 1 , 0 7 0 9 3 0 9 3 0 1 , 0 3 0 MA Y 79 0 9 3 0 9 3 0 8 4 0 9 3 0 9 8 0 7 9 0 6 5 0 6 1 0 7 0 0 MA Y 70 0 7 0 0 8 9 0 9 3 0 1 , 1 2 0 JU N 93 0 1 , 0 3 0 7 5 0 7 9 0 8 4 0 8 9 0 7 5 0 2 8 0 1 9 0 1 9 0 JU N 75 0 1 , 1 2 0 1 , 0 7 0 9 8 0 9 3 0 JU L 37 0 7 9 0 7 0 0 9 8 0 1 , 0 7 0 8 4 0 9 3 0 8 9 0 6 1 0 6 5 0 JU L 1, 0 5 0 5 1 0 1 , 4 5 0 1 , 1 2 0 1 , 4 0 0 AU G 1,4 9 0 7 0 0 7 5 0 8 4 0 7 5 0 8 4 0 5 1 0 2 3 0 2 8 0 2 3 0 AU G 28 0 4 2 0 1 , 2 6 0 9 8 0 7 0 0 SE P 1,3 0 0 1 , 0 0 0 9 0 0 1 , 5 0 0 1 , 3 0 0 1 , 1 0 0 7 0 0 8 0 0 8 0 0 1 , 0 0 0 SE P 90 0 8 0 0 7 0 0 1 , 0 0 0 1 , 4 0 0 OC T 20 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 OC T 20 0 2 0 0 1 , 8 0 0 2 0 0 2 0 0 NO V 2,1 0 0 1 , 5 0 0 9 0 0 1 , 2 0 0 1 , 2 0 0 2 0 0 2 0 0 1 , 0 0 0 2 0 0 2 0 0 NO V 1, 2 0 0 1 , 2 0 0 1 , 9 0 0 1 , 8 0 0 1 , 7 0 0 DE C 1,5 0 0 1 , 4 0 0 1 , 7 0 0 1 , 4 0 0 1 , 3 0 0 1 , 9 0 0 1 , 8 0 0 2 , 2 0 0 2 0 0 2 0 0 DE C 2, 1 0 0 2 , 5 0 0 1 , 8 0 0 2 , 0 0 0 2 , 1 0 0 me a n 1 , 0 2 3 9 0 2 8 3 0 9 4 9 9 7 1 8 9 3 6 8 4 7 4 3 4 8 3 8 3 7 m e a n 8 3 2 9 2 3 1 , 2 0 9 1 , 0 3 4 1 , 1 1 8 st d d e v 49 9 3 2 2 3 2 0 3 7 4 3 4 3 4 1 3 4 1 5 5 3 4 4 0 1 1 , 3 6 1 st d d e v 46 8 5 5 6 4 1 9 4 5 6 4 6 9 ma x 2,1 0 0 1 , 5 0 0 1 , 7 0 0 1 , 5 0 0 1 , 4 5 0 1 , 9 0 0 1 , 8 0 0 2 , 2 0 0 1 , 6 3 0 5 , 2 7 0 ma x 2, 1 0 0 2 , 5 0 0 1 , 9 0 0 2 , 0 0 0 2 , 1 0 0 mi n 20 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 1 9 0 1 9 0 1 9 0 min 20 0 2 0 0 6 1 0 2 0 0 2 0 0 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 1,3 1 0 1 , 0 7 0 7 5 0 6 1 0 6 5 0 7 9 0 9 3 0 8 4 0 7 5 0 JA N 93 0 8 9 0 8 9 0 6 5 0 6 1 0 9 3 0 JA N 98 0 7 9 0 1 , 3 5 0 6 1 0 FE B 1,2 6 0 1 , 2 1 0 5 6 0 4 2 0 1 , 1 2 0 3 7 0 7 5 0 3 , 0 3 0 7 1 0 FE B 75 0 9 8 0 7 9 0 7 0 0 7 5 0 7 5 0 FE B 1, 0 3 0 9 3 0 8 9 0 7 5 0 MA R 1,3 1 0 1 , 1 7 0 7 0 0 7 0 0 1 , 0 3 0 5 6 0 9 8 0 1 1 , 2 9 0 7 9 0 MA R 93 0 6 1 0 8 9 0 5 6 0 5 1 0 6 5 0 MA R 61 0 7 9 0 1 , 2 6 0 1 , 2 1 0 AP R 51 0 1 , 1 7 0 9 8 0 7 9 0 1 , 2 6 0 7 5 0 9 3 0 1 , 1 7 0 8 9 0 AP R 1,0 7 0 1 , 1 7 0 9 , 4 3 0 1 , 2 6 0 7 5 0 6 1 0 AP R 1, 0 3 0 7 0 0 1 , 1 2 0 1 , 1 7 0 MA Y 1,5 4 0 9 3 0 8 4 0 8 9 0 5 6 0 7 5 0 8 9 0 1 , 1 7 0 5 6 0 MA Y 33 0 1 , 5 9 0 1 , 0 3 0 1 , 0 3 0 5 1 0 1 , 0 7 0 MA Y 1, 1 2 0 8 4 0 9 8 0 8 9 0 JU N 1,4 5 0 9 8 0 1 , 4 0 0 1 , 1 7 0 9 3 0 8 4 0 1 , 1 2 0 2 , 0 1 0 2 , 0 1 0 JU N 93 0 1 , 0 3 0 1 , 1 7 0 9 3 0 1 , 1 2 0 7 0 0 JU N 65 0 8 9 0 1 , 3 1 0 8 9 0 JU L 1,7 2 0 2 , 1 5 0 1 9 0 1 , 4 9 0 1 , 0 3 0 9 3 0 1 , 2 1 0 1 , 3 1 0 1 , 3 1 0 JU L 70 0 1 , 2 6 0 7 5 0 1 , 1 7 0 1 , 0 3 0 9 8 0 JU L 1, 4 9 0 1 , 9 1 0 1 , 5 9 0 9 8 0 AU G 1,7 0 0 1 , 2 0 0 1 , 3 0 0 1 , 6 0 0 1 , 3 0 0 1 , 0 0 0 1 , 3 0 0 1 , 4 0 0 6 0 0 AU G 1,1 0 0 9 0 0 1 , 6 0 0 1 , 9 0 0 1 , 2 0 0 7 0 0 AU G 75 0 7 5 0 8 4 0 6 5 0 SE P 1,8 0 0 1 , 3 0 0 1 , 8 0 0 1 , 0 0 0 1 , 3 0 0 1 , 2 0 0 1 , 4 0 0 1 , 1 0 0 9 0 0 SE P 1,7 0 0 1 , 4 0 0 1 , 0 0 0 1 , 5 0 0 1 , 4 0 0 1 , 3 0 0 SE P 1, 2 0 0 1 , 2 0 0 1 , 2 0 0 7 0 0 OC T 1,4 0 0 2 0 0 2 0 0 2 0 0 1 , 2 0 0 1 , 0 0 0 1 , 0 0 0 2 0 0 1 , 2 0 0 OC T 20 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 OC T 20 0 2 0 0 2 0 0 9 0 0 NO V 1,6 0 0 1 , 4 0 0 1 , 8 0 0 2 , 2 0 0 9 0 0 2 , 0 0 0 2 , 0 0 0 2 , 6 0 0 2 , 1 0 0 NO V 1,7 0 0 1 , 1 0 0 1 , 2 0 0 2 , 0 0 0 2 , 2 0 0 1 , 2 0 0 NO V 20 0 1 , 6 0 0 2 , 2 0 0 1 , 4 0 0 DE C 2,3 0 0 2 , 0 0 0 1 , 7 0 0 1 , 6 0 0 1 , 3 0 0 1 , 4 0 0 1 , 2 0 0 2 , 1 0 0 2 , 3 0 0 DE C 1,8 0 0 1 , 3 0 0 2 0 0 1 , 8 0 0 1 , 4 0 0 1 , 9 0 0 DE C 1, 1 0 0 1 , 9 0 0 2 , 1 0 0 1 , 3 0 0 me a n 1 , 4 9 2 1 , 2 3 2 1 , 0 1 8 1 , 0 5 6 1 , 0 4 8 9 6 6 1 , 1 4 3 2 , 3 5 2 1 , 1 7 7 m e a n 1 , 0 1 2 1 , 0 3 6 1 , 5 9 6 1 , 1 4 2 9 7 3 9 1 6 m e a n 8 6 3 1 , 0 4 2 1 , 2 5 3 9 5 4 st d d e v 40 3 4 7 6 5 5 4 5 5 3 2 4 1 4 0 6 3 1 5 2 , 7 9 7 5 9 5 st d d e v 49 1 3 5 4 2 , 3 9 2 5 4 8 5 1 7 4 1 1 st d d e v 37 6 4 9 5 5 2 0 2 5 2 ma x 2,3 0 0 2 , 1 5 0 1 , 8 0 0 2 , 2 0 0 1 , 3 0 0 2 , 0 0 0 2 , 0 0 0 1 1 , 2 9 0 2 , 3 0 0 ma x 1,8 0 0 1 , 5 9 0 9 , 4 3 0 2 , 0 0 0 2 , 2 0 0 1 , 9 0 0 ma x 1, 4 9 0 1 , 9 1 0 2 , 2 0 0 1 , 4 0 0 mi n 51 0 2 0 0 1 9 0 2 0 0 5 6 0 3 7 0 7 5 0 2 0 0 5 6 0 mi n 20 0 2 0 0 2 0 0 2 0 0 2 0 0 2 0 0 mi n 20 0 2 0 0 2 0 0 6 1 0 33 Ta b l e 2 . 1 3 T o t a l P h o s p h o r u s (µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 JA N 90 8 0 6 0 6 0 6 0 5 0 6 0 4 0 2 0 9 0 JA N 11 0 1 2 0 1 3 0 8 0 5 0 FE B 10 0 7 0 8 0 8 0 1 0 0 6 0 5 0 4 0 4 0 4 0 FE B 11 0 1 1 0 1 3 0 8 0 5 0 MA R 100 8 0 7 0 7 0 6 0 6 0 5 0 1 0 1 0 2 0 MA R 10 0 1 0 0 7 0 8 0 9 0 AP R 14 0 2 3 0 1 1 0 8 0 1 4 0 9 0 6 0 1 2 0 6 0 1 0 0 AP R 13 0 1 4 0 1 3 0 4 6 0 1 0 0 MA Y 170 1 5 0 1 1 0 7 0 8 0 7 0 6 0 4 0 3 0 3 0 MA Y 20 0 2 6 0 2 5 0 1 7 0 2 4 0 JU N 90 6 0 3 0 4 0 3 0 7 0 4 0 3 1 0 1 2 0 4 0 JU N 80 1 7 0 7 0 1 0 0 8 0 JU L 50 7 0 9 0 1 1 0 1 0 0 9 0 6 0 4 0 5 0 5 0 JU L 15 0 1 6 0 1 2 0 1 1 0 1 1 0 AU G 19 0 1 1 0 1 0 0 9 0 1 0 0 9 0 1 0 0 7 0 6 0 9 0 AU G 16 0 1 2 0 1 5 0 1 3 0 1 3 0 SE P 80 8 0 8 0 9 0 1 2 0 1 0 0 6 0 5 0 8 0 8 0 SE P 12 0 1 2 0 1 1 0 1 2 0 1 5 0 OC T 150 1 2 0 9 0 1 0 0 7 0 6 0 5 0 2 0 4 0 2 0 OC T 15 0 1 8 0 1 4 0 1 2 0 1 5 0 NO V 80 7 0 7 0 7 0 4 0 4 0 3 0 1 0 3 0 2 0 NO V 15 0 1 0 0 1 0 0 1 2 0 1 8 0 DE C 90 9 0 9 0 1 0 0 1 5 0 9 0 9 0 1 3 0 5 0 3 0 DE C 12 0 1 1 0 9 0 6 0 8 0 me a n 1 1 1 1 0 1 8 2 8 0 8 8 7 3 5 9 7 3 4 9 5 1 m e a n 1 3 2 1 4 1 1 2 4 1 3 6 1 1 8 st d d e v 40 4 6 2 2 1 9 3 6 1 8 1 8 8 0 2 8 2 9 st d d e v 31 4 4 4 5 1 0 2 5 3 ma x 19 0 2 3 0 1 1 0 1 1 0 1 5 0 1 0 0 1 0 0 3 1 0 1 2 0 1 0 0 ma x 20 0 2 6 0 2 5 0 4 6 0 2 4 0 mi n 50 6 0 3 0 4 0 3 0 4 0 3 0 1 0 1 0 2 0 min 80 1 0 0 7 0 6 0 5 0 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 13 0 8 0 5 0 1 4 0 8 0 3 0 8 0 2 9 0 1 2 0 JA N 50 1 0 1 4 0 3 0 6 0 8 0 JA N 40 3 0 5 0 3 0 FE B 70 7 0 5 0 8 0 6 0 4 0 8 0 5 9 0 3 0 FE B 50 3 0 1 9 0 4 0 6 0 6 0 FE B 40 2 0 1 0 1 0 MA R 10 0 9 0 5 0 1 5 0 1 5 0 2 0 2 3 0 8 4 0 4 0 MA R 60 3 0 3 1 0 6 0 6 0 7 0 MA R 40 5 0 3 0 4 0 AP R 17 0 1 4 0 9 0 1 2 0 1 6 0 6 0 1 5 0 5 6 0 1 0 0 AP R 70 4 0 2 4 0 7 0 4 0 0 1 3 0 AP R 70 8 0 7 0 6 0 MA Y 24 0 1 4 0 1 2 0 1 8 0 1 7 0 7 0 1 5 0 7 1 0 8 0 MA Y 15 0 3 5 0 2 6 0 7 0 1 0 0 1 3 0 MA Y 10 0 9 0 3 0 7 0 JU N 22 0 1 5 0 4 1 0 7 6 0 1 8 0 3 0 2 2 0 3 9 0 3 1 0 JU N 15 0 7 0 7 8 0 8 0 1 5 0 1 5 0 JU N 60 1 3 0 6 0 8 0 JU L 28 0 1 8 0 5 5 0 5 1 0 3 6 0 4 0 3 4 0 1 , 9 2 0 1 6 0 JU L 10 0 6 0 6 6 0 1 0 1 1 0 1 1 0 JU L 15 0 1 3 0 5 0 8 0 AU G 24 0 2 2 0 4 2 0 6 4 0 4 4 0 1 0 0 2 3 0 6 9 0 1 1 0 AU G 17 0 8 0 3 5 0 2 3 0 2 3 0 2 2 0 AU G 16 0 1 6 0 1 1 0 1 5 0 SE P 27 0 1 8 0 1 4 0 2 6 0 1 7 0 1 2 0 2 0 0 2 1 0 1 2 0 SE P 17 0 9 0 3 4 0 1 4 0 1 7 0 1 6 0 SE P 17 0 1 0 0 4 0 3 0 OC T 15 0 1 1 0 1 1 0 1 9 0 2 0 0 8 0 3 9 0 2 , 8 1 0 4 0 OC T 10 0 4 0 1 6 0 1 0 0 8 0 1 2 0 OC T 14 0 1 0 0 5 0 8 0 NO V 36 0 9 0 6 0 9 0 1 6 0 8 0 1 3 0 1 5 0 9 0 NO V 80 4 0 8 0 4 0 6 0 1 1 0 NO V 80 6 0 3 0 4 0 DE C 11 0 9 0 5 0 6 0 1 1 0 5 0 1 1 0 2 9 0 2 0 DE C 80 5 0 8 0 6 0 1 1 0 1 1 0 DE C 80 7 0 4 0 3 0 me a n 1 9 5 1 2 8 1 7 5 2 6 5 1 8 7 6 0 1 9 3 7 8 8 1 0 2 m e a n 1 0 3 7 4 2 9 9 7 8 1 3 3 1 2 1 m e a n 9 4 8 5 4 8 5 8 st d d e v 83 4 6 1 7 0 2 2 6 1 0 5 2 9 9 3 7 5 7 7 5 st d d e v 44 8 6 2 0 9 5 6 9 5 4 2 st d d e v 47 4 0 2 4 3 6 ma x 36 0 2 2 0 5 5 0 7 6 0 4 4 0 1 2 0 3 9 0 2 , 8 1 0 3 1 0 ma x 17 0 3 5 0 7 8 0 2 3 0 4 0 0 2 2 0 ma x 17 0 1 6 0 1 1 0 1 5 0 mi n 70 7 0 5 0 6 0 6 0 2 0 8 0 1 5 0 2 0 mi n 50 1 0 8 0 1 0 6 0 6 0 mi n 40 2 0 1 0 1 0 34 Ta b l e 2 . 1 4 O r t h o p h o s p h a t e (µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 B B T JA N 40 5 0 4 0 3 0 4 0 3 0 3 0 2 0 1 0 1 0 JA N 70 7 0 7 0 4 0 2 0 2 1 FE B 40 4 0 5 0 3 0 8 0 3 0 2 0 1 0 1 0 1 0 FE B 60 5 0 4 0 4 0 2 0 3 9 MA R 50 4 0 4 0 3 0 2 0 3 0 2 0 0 0 0 MA R 70 7 0 4 0 5 0 3 0 2 1 2 AP R 60 5 0 4 0 3 0 3 0 2 0 2 0 1 0 0 1 0 AP R 80 9 0 7 0 7 0 3 0 MA Y 60 7 0 6 0 5 0 4 0 4 0 4 0 2 0 2 0 1 0 MA Y 80 1 2 0 1 0 0 7 0 4 0 2 4 JU N 60 6 0 3 0 4 0 4 0 3 0 3 0 1 0 1 0 1 0 JU N 80 1 2 0 7 0 8 0 4 0 2 7 JU L 50 7 0 7 0 8 0 6 0 4 0 5 0 3 0 3 0 1 0 JU L 70 7 0 6 0 6 0 8 0 1 7 AU G 60 4 0 5 0 6 0 4 0 1 0 4 0 3 0 2 0 1 0 AU G 70 6 0 7 0 7 0 3 0 3 1 SE P 10 4 0 3 0 4 0 4 0 3 0 3 0 4 0 2 0 1 0 SE P 60 5 0 5 0 4 0 9 0 1 7 OC T 60 6 0 4 0 3 0 3 0 3 0 3 0 2 0 2 0 1 0 OC T 90 1 3 0 7 0 8 0 8 0 2 8 NO V 50 5 0 6 0 5 0 4 0 4 0 3 0 1 0 1 0 2 0 NO V 70 8 0 5 0 7 0 4 0 2 7 DE C 20 3 0 3 0 3 0 3 0 3 0 3 0 2 0 2 0 2 0 DE C 30 3 0 3 0 2 0 3 0 8 me a n 4 7 5 0 4 5 4 2 4 1 3 0 3 1 1 8 1 4 1 1 m e a n 6 9 7 8 6 0 5 8 4 4 4 1 st d d e v 16 1 2 1 3 1 5 1 5 8 9 1 1 9 5 st d d e v 14 3 0 1 8 1 8 2 4 5 5 ma x 60 7 0 7 0 8 0 8 0 4 0 5 0 4 0 3 0 2 0 ma x 90 1 3 0 1 0 0 8 0 9 0 2 1 2 min 10 3 0 3 0 3 0 2 0 1 0 2 0 0 0 0 mi n 30 3 0 3 0 2 0 2 0 8 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 70 1 0 1 0 9 0 3 0 1 0 3 0 2 0 0 3 0 JA N 20 1 0 1 0 0 1 0 2 0 3 0 JA N 20 1 0 1 0 1 0 FE B 50 2 0 3 0 6 0 2 0 1 0 6 0 4 3 0 1 0 FE B 10 3 0 1 5 0 1 0 2 0 2 0 FE B 20 1 0 1 0 1 0 MA R 60 4 0 3 0 1 3 0 8 0 1 0 1 2 0 5 5 0 1 0 MA R 20 3 0 2 4 0 1 0 2 0 4 0 MA R 20 2 0 2 0 2 0 AP R 100 4 0 3 0 8 0 3 0 1 0 6 0 5 6 0 2 0 AP R 20 4 0 2 2 0 2 0 2 0 3 0 AP R 30 3 0 1 0 3 0 MA Y 110 4 0 3 0 8 0 5 0 1 0 5 0 1 1 0 1 0 MA Y 11 0 1 2 0 1 9 0 2 0 3 0 5 0 MA Y 40 1 0 3 0 2 0 JU N 100 4 0 1 0 8 0 4 0 1 0 7 0 3 0 0 1 0 0 JU N 40 7 0 1 8 0 2 0 2 0 5 0 JU N 40 3 0 5 0 6 0 JU L 18 0 7 0 7 0 2 8 0 7 0 4 0 2 0 0 1 8 0 0 4 0 JU L 40 6 0 1 4 0 1 0 4 0 1 1 0 JU L AU G 15 0 4 0 2 0 2 5 0 6 0 2 0 6 0 4 7 0 3 0 AU G 40 5 0 1 3 0 1 0 6 0 5 0 AU G 60 4 0 4 0 0 SE P 27 0 9 0 8 0 1 7 0 9 0 4 0 1 4 0 1 3 0 6 0 SE P 10 0 8 0 1 9 0 2 0 8 0 6 0 SE P 11 0 4 0 1 0 1 0 OC T 13 0 5 0 6 0 1 2 0 5 0 2 0 2 8 0 1 8 6 0 1 0 OC T 40 4 0 8 0 2 0 1 0 5 0 OC T 70 1 0 2 0 3 0 NO V 270 4 0 3 0 7 0 5 0 1 0 6 0 1 0 0 3 0 NO V 20 3 0 8 0 1 0 2 0 4 0 NO V 10 1 0 1 0 1 0 DE C 100 3 0 2 0 5 0 6 0 2 0 5 0 3 0 0 0 DE C 30 2 0 5 0 1 0 4 0 3 0 DE C 40 2 0 1 0 0 me a n 1 3 3 4 3 3 5 1 2 2 5 3 1 8 9 8 5 6 8 2 9 m e a n 4 1 4 8 1 4 6 1 4 3 2 4 7 m e a n 4 2 2 1 2 0 1 8 st d d e v 71 2 0 2 2 7 2 2 0 1 1 7 2 5 8 6 2 7 st d d e v 30 2 9 5 8 5 2 0 2 2 st d d e v 28 1 2 1 3 1 6 ma x 27 0 9 0 8 0 2 8 0 9 0 4 0 2 8 0 1 , 8 6 0 1 0 0 ma x 11 0 1 2 0 2 4 0 2 0 8 0 1 1 0 ma x 11 0 4 0 5 0 6 0 min 50 1 0 1 0 5 0 2 0 1 0 3 0 1 0 0 0 mi n 10 1 0 5 0 1 0 1 0 2 0 mi n 10 1 0 1 0 0 35 Ta b l e 2 . 1 5 A l u m i n u m ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r T a b l e 2 . 1 6 A r s e n i c ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r Pr o g r a m s t a t i o n s . T h e r e i s n o N C S t a t e s t a n d a r d . P r o g r a m s t a t i o n s . T h e N C S t a t e s t a n d a r d i s 1 0 m g / L f o r a l l s t a t i o n s . NA V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P N A V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P FE B 30 9 3 9 3 1 7 6 2 9 0 3 9 2 4 3 8 3 9 0 FE B 00 0 0 0 0 0 AP R 31 5 1 8 5 2 6 7 1 1 0 1 6 1 1 4 8 2 0 1 AP R 00 0 0 0 0 0 JU N 287 1 7 3 8 4 1 3 1 2 6 4 1 2 JU N 00 0 0 0 0 0 AU G 40 2 3 7 4 4 6 4 3 1 8 3 6 7 2 5 5 8 AU G 00 0 0 0 0 0 OC T 67 4 2 5 1 2 1 6 2 0 3 1 6 2 3 1 7 4 3 1 OC T 00 0 0 0 0 0 DE C 60 1 8 9 8 6 1 1 4 0 5 2 5 1 2 6 9 6 0 1 DE C 00 0 0 0 0 0 me a n 4 3 1 3 5 3 2 9 5 2 2 8 2 2 3 2 2 1 3 4 9 m e a n 0 0 0 0 0 0 0 st d d e v 15 2 2 7 4 1 9 0 1 2 4 1 3 3 1 3 6 1 7 4 st d d e v 00 0 0 0 0 0 ma x 67 4 8 9 8 6 1 1 4 0 5 3 9 2 4 3 8 6 0 1 ma x 00 0 0 0 0 0 mi n 287 1 7 3 8 4 1 3 2 5 5 8 mi n 00 0 0 0 0 0 SA R L R C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 S A R L R C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 FE B 12 7 1 4 0 2 8 7 2 7 6 1 0 0 3 5 2 6 4 3 2 7 8 FE B 00 0 0 0 0 0 0 AP R 36 1 1 5 9 2 1 5 1 4 8 8 3 2 6 3 7 9 9 1 4 0 AP R 00 0 0 0 0 0 0 JU N 22 3 4 3 7 1 1 9 3 7 1 5 8 6 9 6 7 6 JU N 22 0 0 0 0 0 0 0 AU G 15 7 4 5 2 0 2 3 3 3 5 3 8 9 7 5 AU G 00 0 0 0 0 0 0 OC T 39 7 5 5 1 3 6 5 2 8 6 3 5 3 6 9 3 1 0 0 4 4 0 3 OC T 00 0 0 0 0 0 0 DE C 15 0 3 3 0 2 2 4 3 7 4 9 0 4 8 5 1 0 2 5 1 9 8 DE C 00 0 0 0 0 0 0 me a n 1 7 9 3 2 1 2 8 8 2 0 1 1 1 1 3 2 6 6 8 0 4 4 5 m e a n 4 0 0 0 0 0 0 0 st d d e v 15 0 2 5 6 8 7 1 2 4 1 1 3 2 2 3 3 2 5 2 9 4 st d d e v 80 0 0 0 0 0 0 ma x 39 7 7 4 5 4 3 7 3 7 4 3 5 3 6 9 3 1 0 2 5 9 7 5 ma x 22 0 0 0 0 0 0 0 mi n 15 3 2 0 2 3 3 3 6 9 1 4 0 mi n 00 0 0 0 0 0 0 36 Ta b l e 2 . 1 7 C a d m i u m ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m T a b l e 2 . 1 8 C h r o m i u m ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r st a t i o n s . T h e N C S t a t e s t a n d a r d i s 2 . 0 µg/ L f o r f r e s h w a t e r a n d 5 . 0 µg/ L f o r s t a t i o n s . T h e N C S t a t e s t a n d a r d i s 5 0 µg/ L f o r f r e s h w a t e r a n d 2 0 µg/ L sa l t w a t e r . sa l t w a t e r . NA V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P N A V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P FE B 00 0 0 0 0 0 FE B 00 0 0 0 0 0 AP R 00 0 0 0 0 0 AP R 00 0 0 0 0 0 JU N 00 0 0 0 0 0 JU N 00 0 0 0 0 0 AU G 00 0 0 0 0 0 AU G 00 0 0 0 0 0 OC T 00 0 0 0 0 0 OC T 00 0 0 0 0 0 DE C 00 0 0 0 0 0 DE C 00 0 0 0 0 0 mean 0 0 0 0 0 0 0 m e a n 0 0 0 0 0 0 0 st d d e v 00 0 0 0 0 0 st d d e v 00 0 0 0 0 0 ma x 00 0 0 0 0 0 ma x 00 0 0 0 0 0 mi n 00 0 0 0 0 0 mi n 00 0 0 0 0 0 SA R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 S A R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 FE B 00 0 0 0 0 0 0 FE B 00 0 0 0 0 0 0 AP R 00 0 0 0 0 0 0 AP R 00 0 0 0 0 0 0 JU N 00 0 0 0 0 0 0 JU N 00 0 0 0 0 0 0 AU G 00 0 0 0 0 0 0 AU G 00 0 0 0 0 0 0 OC T 00 0 0 0 0 0 0 OC T 00 0 0 0 0 0 0 DE C 00 0 0 0 0 0 0 DE C 00 0 0 0 0 0 0 mean 0 0 0 0 0 0 0 0 m e a n 0 0 0 0 0 0 0 0 st d d e v 00 0 0 0 0 0 0 st d d e v 00 0 0 0 0 0 0 ma x 00 0 0 0 0 0 0 ma x 00 0 0 0 0 0 0 mi n 00 0 0 0 0 0 0 mi n 00 0 0 0 0 0 0 37 Ta b l e 2 . 1 9 C o p p e r ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m T a b l e 2 . 2 0 I r o n ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m st a t i o n s . T h e N C S t a t e s t a n d a r d i s 7 . 0 µg/ L f o r f r e s h w a t e r a n d 3 . 0 µg/ L f o r s t a t i o n s . T h e N C S t a t e s t a n d a r d i s 1 , 0 0 0 µg/ L . sa l t w a t e r . NA V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P N A V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P FE B 00 0 0 0 0 0 FE B 59 3 6 7 1 2 2 5 4 1 2 3 4 7 7 5 7 6 2 3 AP R 0 0 0 0 8 6 0 0 AP R 77 6 3 4 3 3 9 3 2 4 5 3 7 5 4 2 8 5 4 9 JU N 00 0 0 0 0 7 8 JU N 94 8 1 7 4 2 8 5 2 9 4 4 6 8 5 2 5 1 4 AU G 00 0 0 0 0 0 AU G 54 6 4 9 7 3 3 7 2 6 3 3 5 2 5 3 3 6 3 5 OC T 00 0 0 0 0 0 OC T 97 1 5 2 9 3 4 2 2 6 2 2 8 4 7 6 4 9 8 0 DE C 00 0 0 0 0 0 DE C 78 5 1 , 0 8 0 9 2 3 5 7 3 3 9 3 6 7 6 9 2 7 me a n 0 0 0 0 1 4 0 1 3 m e a n 7 7 0 5 4 9 4 1 8 3 4 2 3 0 0 6 6 8 7 0 5 st d d e v 0 0 0 0 3 2 0 2 9 st d d e v 16 0 2 8 4 2 3 2 1 1 7 1 1 8 1 4 5 1 8 1 ma x 0 0 0 0 8 6 0 7 8 ma x 97 1 1 0 8 0 9 2 3 5 7 3 3 9 3 8 5 2 9 8 0 mi n 00 0 0 0 0 0 mi n 54 6 1 7 4 2 2 5 2 4 5 4 6 4 2 8 5 1 4 SA R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 S A R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 FE B 00 0 0 0 0 0 0 FE B 41 1 4 2 7 6 0 4 5 0 9 2 4 3 4 5 6 3 3 8 6 5 5 AP R 00 0 0 0 0 0 0 AP R 13 2 0 8 2 1 9 2 1 8 1 5 5 2 7 5 7 9 7 7 6 1 0 9 1 JU N 00 0 0 0 0 0 0 JU N 14 8 0 2 2 0 0 1 8 9 0 3 4 8 0 2 5 2 0 7 5 6 1 1 8 5 1 1 6 3 AU G 00 0 0 0 0 0 0 AU G 12 4 0 1 0 6 0 7 3 0 1 8 9 0 1 5 9 0 5 2 5 9 5 4 1 8 8 OC T 00 0 0 0 0 0 0 OC T 14 9 0 3 1 6 0 1 1 3 0 1 3 2 4 9 9 7 9 2 7 1 6 5 2 9 8 6 DE C 00 0 0 0 0 0 0 DE C 55 3 1 3 3 8 4 7 5 6 8 1 2 4 8 6 7 3 9 7 3 5 6 5 me a n 0 0 0 0 0 0 0 0 m e a n 1 0 8 2 1 5 0 1 9 5 8 1 4 5 0 1 0 2 1 6 5 3 9 8 0 7 7 5 st d d e v 00 0 0 0 0 0 0 st d d e v 43 5 9 2 0 4 6 7 1 0 1 7 8 1 8 1 5 6 3 9 8 3 4 1 ma x 00 0 0 0 0 0 0 ma x 14 9 0 3 1 6 0 1 8 9 0 3 4 8 0 2 5 2 0 9 2 7 1 6 5 2 1 1 6 3 mi n 00 0 0 0 0 0 0 mi n 41 1 4 2 7 4 7 5 5 0 9 2 4 3 4 5 6 3 3 8 1 8 8 38 Ta b l e 2 . 2 1 L e a d ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m T a b l e 2 . 2 2 M e r c u r y ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m st a t i o n s . T h e N C S t a t e s t a n d a r d i s 2 5 µg/ L . s t a t i o n s . T h e N C S t a t e s t a n d a r d i s 0 . 0 1 2 µg/ L f o r f r e s h w a t e r a n d 0 . 0 2 5 fo r s a l t w a t e r . NA V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P N A V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P FE B 00 0 0 0 0 0 FE B 00 0 0 0 0 0 AP R 00 0 0 0 0 0 AP R 00 0 0 0 0 0 JU N 00 0 0 0 0 1 3 JU N 00 0 0 0 0 0 AU G 00 0 0 0 0 0 AU G 00 0 0 0 0 0 OC T 00 0 0 0 0 0 OC T 00 0 0 0 0 0 DE C 00 0 0 0 0 0 DE C 00 0 0 0 0 0 mean 0 0 0 0 0 0 2 m e a n 0 0 0 0 0 0 0 st d d e v 00 0 0 0 0 5 st d d e v 00 0 0 0 0 0 ma x 00 0 0 0 0 1 3 ma x 00 0 0 0 0 0 mi n 00 0 0 0 0 0 mi n 00 0 0 0 0 0 SA R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 S A R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 FE B 00 0 0 0 0 0 0 FE B 00 0 0 0 0 0 0 AP R 00 0 0 0 0 0 0 AP R 00 0 0 0 0 0 0 JU N 00 0 0 0 0 0 0 JU N 00 0 0 0 0 0 0 AU G 00 0 0 0 0 0 0 AU G 00 0 0 0 0 0 0 OC T 00 0 0 0 0 0 0 OC T 00 0 0 0 0 0 0 DE C 00 0 0 0 0 0 0 DE C 00 0 0 0 0 0 0 mean 0 0 0 0 0 0 0 0 m e a n 0 0 0 0 0 0 0 0 st d d e v 00 0 0 0 0 0 0 st d d e v 00 0 0 0 0 0 0 ma x 00 0 0 0 0 0 0 ma x 00 0 0 0 0 0 0 mi n 00 0 0 0 0 0 0 mi n 00 0 0 0 0 0 0 39 Ta b l e 2 . 2 3 N i c k e l ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m T a b l e 2 . 2 4 Z i n c ( µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m st a t i o n s . T h e N C S t a t e s t a n d a r d i s 8 8 µg/ L f o r f r e s h w a t e r a n d 8 . 3 µg/ L s t a t i o n s . T h e N C S t a t e s t a n d a r d i s 5 0 µg/ L f o r f r e s h w a t e r a n d 8 6 µg/ L fo r s a l t w a t e r . fo r s a l t w a t e r . NA V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P N A V M 5 4 M 3 5 M 2 3 M 1 8 N C 1 1 D P FE B 00 0 0 0 0 0 FE B 00 1 5 0 0 0 0 AP R 0 0 0 0 1 6 0 0 AP R 22 0 0 1 4 1 3 3 1 5 1 3 JU N 00 0 0 0 0 0 JU N 00 0 0 0 0 1 3 5 AU G 00 0 0 0 0 0 AU G 00 0 0 0 0 0 OC T 00 0 0 0 0 0 OC T 00 0 0 0 0 0 DE C 00 0 0 0 0 0 DE C 00 0 0 0 0 0 mean 0 0 0 0 3 0 0 m e a n 4 0 3 2 2 2 3 2 5 st d d e v 00 0 0 6 0 0 st d d e v 80 6 5 5 0 6 5 0 ma x 0 0 0 0 1 6 0 0 ma x 22 0 1 5 1 4 1 3 3 1 5 1 3 5 mi n 00 0 0 0 0 0 mi n 00 0 0 0 0 0 SA R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 S A R LR C B C 1 1 7 6 R C G C O N C F 1 1 7 C O L L V C 2 FE B 00 0 0 0 0 0 0 FE B 00 1 2 0 0 0 0 0 AP R 00 0 0 0 0 0 0 AP R 13 1 4 3 1 0 0 1 8 1 4 1 7 JU N 00 0 0 6 0 0 0 JU N 00 0 0 0 0 0 0 AU G 00 0 0 0 0 0 0 AU G 00 0 1 4 0 0 0 0 OC T 00 0 0 0 0 1 0 0 OC T 00 0 0 0 0 0 0 DE C 00 0 0 0 0 0 0 DE C 00 0 0 0 0 0 0 mean 0 0 0 0 1 0 2 0 m e a n 2 2 7 2 0 3 2 3 st d d e v 00 0 0 2 0 4 0 st d d e v 55 1 2 5 0 7 5 6 ma x 00 0 0 6 0 1 0 0 ma x 13 1 4 3 1 1 4 0 1 8 1 4 1 7 mi n 00 0 0 0 0 0 0 mi n 00 0 0 0 0 0 0 40 Ta b l e 2 . 2 5 C h l o r o p h y l l a (µg/ l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . T h e N C S t a t e s t a n d a r d i s 4 0 µg/ L . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P B B T I C N C F 6 JA N 1. 4 1 . 0 1 . 5 1 . 6 1 . 7 1 . 7 1 . 5 3 . 6 1 . 9 2 . 2 JA N 1.6 1 . 2 1 . 4 0 . 8 1 . 0 1 . 9 FE B 4. 7 5 . 2 5 . 9 4 . 4 5 . 3 4 . 9 6 . 6 5 . 6 7 . 5 5 . 7 FE B 4.0 4 . 1 4 . 5 2 . 2 6 . 0 0 . 7 MA R 3. 6 2 . 2 2 . 8 3 . 2 3 . 2 1 . 9 2 . 4 3 . 4 9 . 5 4 . 8 MA R 6.2 5 . 1 3 . 6 2 . 9 3 . 6 1 . 6 AP R 2. 3 2 . 5 6 . 3 5 . 3 3 . 2 4 . 7 4 . 9 4 . 0 3 . 5 4 . 7 AP R 15 . 2 1 1 . 9 1 1 . 0 5 . 2 5 . 2 4 . 0 MA Y 1. 7 1 . 5 1 . 2 1 . 6 2 . 6 3 . 6 3 . 4 4 . 5 3 . 6 4 . 1 MA Y 2.4 2 . 0 2 . 1 0 . 9 1 . 5 6 . 7 JU N 3. 2 6 . 1 4 . 6 8 . 0 1 1 . 4 1 2 . 4 1 2 . 7 9 . 8 JU N 7.4 9 . 5 4 . 4 1 . 1 2 . 1 1 0 . 6 JU L 0. 3 0 . 5 1 . 3 0 . 2 1 . 5 1 . 4 1 . 6 1 . 3 0 . 9 0 . 6 JU L 1.2 1 . 0 1 . 1 0 . 4 0 . 7 0 . 2 AU G 5. 4 5 . 1 9 . 6 1 1 . 7 5 . 6 1 3 . 6 9 . 5 1 0 . 0 8 . 5 1 7 . 2 AU G 9.7 9 . 1 7 . 0 4 . 3 4 . 7 8 . 3 SE P 1. 0 1 . 0 1 . 5 1 . 6 2 . 7 2 . 3 2 . 5 3 . 1 2 . 3 1 0 . 2 SE P 1.2 0 . 7 1 . 0 0 . 3 0 . 5 0 . 5 OC T 1. 5 1 . 3 3 . 7 1 . 7 2 . 1 2 . 9 3 . 0 3 . 6 3 . 0 5 . 5 OC T 8.4 3 . 1 1 . 5 0 . 9 1 . 1 1 . 4 NO V 1. 2 2 . 2 1 . 2 1 . 4 2 . 7 2 . 5 2 . 3 3 . 3 6 . 2 3 . 3 NO V 0.7 0 . 7 0 . 5 0 . 4 0 . 5 1 . 6 DE C 1. 7 1 . 8 1 . 8 2 . 0 0 . 9 1 . 2 0 . 9 0 . 8 1 . 7 2 . 0 DE C 1.8 2 . 1 2 . 5 0 . 6 1 . 4 0 . 6 me a n 2 . 3 2 . 5 3 . 5 3 . 2 3 . 3 4 . 3 4 . 3 4 . 7 4 . 4 5 . 8 m e a n 5 . 0 4 . 2 3 . 4 1 . 7 2 . 4 3 . 2 st d d e v 1. 5 1 . 8 2 . 6 3 . 0 1 . 9 3 . 8 3 . 4 3 . 3 2 . 8 4 . 4 st d d e v 4.3 3 . 7 2 . 9 1 . 6 1 . 9 3 . 3 ma x 5. 4 6 . 1 9 . 6 1 1 . 7 8 . 0 1 3 . 6 1 2 . 4 1 2 . 7 9 . 5 1 7 . 2 ma x 15 . 2 1 1 . 9 1 1 . 0 5 . 2 6 . 0 1 0 . 6 mi n 0. 3 0 . 5 1 . 2 0 . 2 0 . 9 1 . 2 0 . 9 0 . 8 0 . 9 0 . 6 mi n 0.7 0 . 7 0 . 5 0 . 3 0 . 5 0 . 2 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6R C L C O G C O S R BR N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 JA N 1. 4 5 . 1 6 . 4 3 . 5 2 . 3 1 . 6 2 . 9 1 . 2 3 . 5 JA N 1.2 1 . 4 1 . 7 3 . 6 1 . 0 3 . 0 JA N 1.6 0 . 9 0 . 3 1 . 1 FE B 2. 1 0 . 7 1 . 4 2 . 0 8 . 0 1 . 4 0 . 7 2 . 6 1 . 5 FE B 0.9 0 . 8 0 . 5 0 . 8 1 . 1 1 . 1 FE B 0.3 0 . 6 1 . 1 1 . 1 MA R 2. 8 0 . 6 0 . 9 1 . 1 1 1 . 4 1 . 2 0 . 5 2 . 6 2 . 0 MA R 0.5 0 . 6 0 . 8 1 . 0 1 . 1 1 . 1 MA R 1.5 0 . 4 2 . 1 1 . 2 AP R 2. 6 1 . 5 1 . 5 0 . 9 6 . 1 0 . 3 1 . 1 3 . 1 2 . 2 AP R 0.5 0 . 5 1 . 1 2 . 9 3 . 7 1 . 0 AP R 0.3 0 . 4 1 . 4 1 . 1 MA Y 3. 9 1 . 1 1 . 3 2 . 3 4 . 9 0 . 7 0 . 9 0 . 9 0 . 6 MA Y 2.5 2 . 2 2 . 1 2 . 5 1 . 2 2 . 0 MA Y 0.4 0 . 4 1 . 1 0 . 8 JU N 1. 9 1 . 4 7 . 5 5 . 1 3 . 8 0 . 4 0 . 8 7 . 0 6 . 0 JU N 0.5 0 . 5 1 . 1 2 . 6 0 . 9 0 . 9 JU N 1.4 1 . 0 2 . 5 2 . 8 JU L 4. 3 1 . 3 3 0 . 4 8 . 7 3 6 . 5 1 9 . 7 0 . 6 3 . 0 2 9 . 8 JU L 0.2 0 . 5 2 . 0 1 . 1 0 . 4 0 . 8 JU L AU G 4. 5 4 . 4 1 7 . 1 1 3 . 0 1 4 . 4 3 . 8 2 . 3 1 . 3 4 . 1 AU G 1.4 0 . 4 1 . 0 7 . 3 1 . 3 0 . 6 AU G 1.2 1 . 9 0 . 9 7 . 8 SE P 0. 3 0 . 6 1 . 4 1 . 6 1 . 0 1 . 7 0 . 8 0 . 6 0 . 4 SE P 0.8 0 . 3 0 . 9 2 . 1 1 . 7 1 . 3 SE P 0.6 1 . 1 0 . 4 0 . 8 OC T 0. 7 0 . 4 1 . 4 2 . 4 4 . 8 1 . 3 0 . 3 1 . 1 7 . 7 OC T 0.4 1 . 1 1 . 5 3 . 9 0 . 7 2 . 5 OC T 0.2 0 . 3 0 . 2 1 . 4 NO V 0. 8 1 . 2 0 . 8 1 . 5 2 . 0 7 . 3 1 . 0 0 . 7 0 . 5 NO V 0.3 0 . 6 0 . 7 0 . 8 0 . 4 0 . 2 NO V 0.1 0 . 2 0 . 3 0 . 6 DE C 0. 7 0 . 6 0 . 7 3 . 7 2 . 1 1 . 8 0 . 5 0 . 5 0 . 2 DE C 0.9 0 . 7 0 . 9 1 . 4 0 . 8 0 . 6 DE C 0.4 0 . 4 0 . 3 1 . 0 me a n 2 . 2 1 . 6 5 . 9 3 . 8 8 . 1 3 . 4 1 . 0 2 . 1 4 . 9 m e a n 0 . 8 0 . 8 1 . 2 2 . 5 1 . 2 1 . 3 m e a n 0 . 7 0 . 7 1 . 0 1 . 8 st d d e v 1. 4 1 . 5 8 . 7 3 . 5 9 . 4 5 . 2 0 . 7 1 . 8 7 . 8 st d d e v 0.6 0 . 5 0 . 5 1 . 8 0 . 8 0 . 8 st d d e v 0.5 0 . 5 0 . 7 2 . 0 ma x 4. 5 5 . 1 3 0 . 4 1 3 . 0 3 6 . 5 1 9 . 7 2 . 9 7 . 0 2 9 . 8 ma x 2.5 2 . 2 2 . 1 7 . 3 3 . 7 3 . 0 ma x 1.6 1 . 9 2 . 5 7 . 8 mi n 0. 3 0 . 4 0 . 7 0 . 9 1 . 0 0 . 3 0 . 3 0 . 5 0 . 2 min 0.2 0 . 3 0 . 5 0 . 8 0 . 4 0 . 2 mi n 0.1 0 . 2 0 . 2 0 . 6 41 Ta b l e 2 . 2 6 B i o c h e m i c a l O x y g e n D e m a n d ( m g / l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o g r a m s t a t i o n s . 5- D a y B i o c h e m i c a l O x y g e n D e m a n d NC 1 1 A C A N C S A R G S N 4 0 3 R O C B C 1 1 7 N C F 1 1 7 B 2 1 0 L V C 2 B B T JA N 0. 7 1 . 1 1 . 4 1 . 1 1 . 2 1 . 1 1 . 9 1 . 9 0 . 9 1 . 2 1 . 1 0 . 7 FE B 1. 0 1 . 0 1 . 3 1 . 3 2 . 0 1 . 6 1 . 2 2 . 4 1 . 5 1 . 4 1 . 7 1 . 3 MA R 1. 1 1 . 2 2 . 9 1 . 5 0 . 9 1 . 1 1 . 1 8 . 8 0 . 6 0 . 8 1 . 7 1 . 1 AP R 1. 6 1 . 9 2 . 1 1 . 7 1 . 2 1 . 3 2 . 0 1 . 4 0 . 9 1 . 7 1 . 5 MA Y 1. 3 1 . 3 2 . 3 1 . 4 1 . 4 1 . 5 1 . 8 1 . 7 1 . 4 1 . 2 1 . 5 1 . 1 JU N 1. 7 2 . 4 2 . 2 1 . 5 3 . 4 2 . 8 1 . 4 4 . 1 0 . 9 1 . 6 1 . 7 1 . 6 JU L 1. 3 2 . 2 1 . 6 1 . 4 2 . 6 2 . 3 1 . 2 1 . 5 1 . 2 AU G 1. 2 1 . 7 2 . 5 2 . 1 1 . 7 1 . 4 3 . 6 3 . 5 1 . 4 SE P 1. 5 2 . 1 2 . 2 1 . 9 1 . 9 2 . 3 1 . 5 2 . 1 1 . 8 2 . 1 1 . 7 OC T 1. 7 1 . 7 0 . 9 0 . 8 2 . 0 2 . 3 1 . 9 1 . 0 1 . 2 1 . 1 1 . 0 1 . 3 NO V 2. 0 1 . 1 1 . 9 1 . 3 0 . 9 4 . 7 1 . 9 1 . 3 1 . 2 1 . 5 2 . 3 2 . 3 DE C 1. 3 1 . 4 0 . 9 0 . 7 0 . 8 0 . 9 1 . 1 0 . 9 0 . 8 0 . 8 0 . 9 0 . 9 me d i a n 1. 3 1 . 6 1 . 9 1 . 4 1 . 4 1 . 8 1 . 9 1 . 6 1 . 2 1 . 2 1 . 7 1 . 3 me a n 1. 4 1 . 6 1 . 8 1 . 3 1 . 7 2 . 0 1 . 7 2 . 4 1 . 2 1 . 4 1 . 7 1 . 3 ma x 2. 0 2 . 4 2 . 9 1 . 7 3 . 4 4 . 7 2 . 3 8 . 8 2 . 1 3 . 6 3 . 5 2 . 3 mi n 0. 7 1 . 0 0 . 9 0 . 7 0 . 8 0 . 9 1 . 1 0 . 9 0 . 6 0 . 8 0 . 9 0 . 7 st d e v 0. 4 0 . 5 0 . 6 0 . 3 0 . 8 1 . 0 0 . 4 2 . 2 0 . 4 0 . 8 0 . 7 0 . 4 20 - D a y B i o c h e m i c a l O x y g e n D e m a n d NC 1 1 A C A N C S A R G S N 4 0 3 R O C B C 1 1 7 N C F 1 1 7 B 2 1 0 L V C 2 B B T JA N 2. 3 3 . 2 3 . 8 3 . 2 3 . 1 2 . 3 4 . 5 4 . 7 2 . 7 2 . 1 3 . 0 2 . 0 FE B 2. 8 2 . 9 3 . 7 4 . 6 5 . 3 4 . 4 3 . 1 8 . 4 4 . 4 4 . 3 5 . 9 3 . 2 MA R 2. 7 3 . 5 6 . 4 4 . 1 3 . 4 2 . 8 3 . 1 2 3 . 8 2 . 6 2 . 5 5 . 9 3 . 2 AP R 4. 1 4 . 8 5 . 6 4 . 6 3 . 0 3 . 5 5 . 0 6 . 6 2 . 4 4 . 8 6 . 9 MA Y 3. 3 3 . 5 5 . 2 3 . 4 2 . 7 3 . 1 3 . 8 4 . 0 3 . 8 3 . 5 3 . 8 3 . 3 JU N 4. 3 6 . 4 6 . 2 3 . 9 8 . 5 8 . 2 3 . 7 8 . 7 2 . 6 3 . 9 4 . 6 4 . 4 JU L 3. 0 5 . 0 5 . 4 3 . 7 6 . 1 6 . 0 3 . 4 5 . 3 3 . 5 AU G 3. 1 4 . 0 6 . 5 6 . 0 5 . 3 3 . 5 6 . 8 8 . 2 3 . 4 SE P 3. 8 5 . 1 6 . 1 4 . 7 4 . 7 5 . 9 4 . 1 5 . 0 4 . 6 4 . 1 4 . 4 OC T 3. 6 3 . 8 4 . 7 2 . 9 4 . 8 5 . 4 4 . 9 3 . 2 3 . 7 2 . 9 3 . 1 3 . 4 NO V 4. 6 3 . 6 5 . 8 4 . 3 2 . 6 8 . 6 4 . 2 3 . 3 3 . 5 3 . 6 6 . 1 5 . 7 DE C me d i a n 3. 3 3 . 8 5 . 5 3 . 9 4 . 1 4 . 7 4 . 2 5 . 3 3 . 5 3 . 6 4 . 7 3 . 4 me a n 3. 4 4 . 2 5 . 3 3 . 9 4 . 4 5 . 0 4 . 3 7 . 0 3 . 5 3 . 7 5 . 0 3 . 9 ma x 4. 6 6 . 4 6 . 4 4 . 6 8 . 5 8 . 6 6 . 0 2 3 . 8 5 . 0 6 . 8 8 . 2 6 . 9 mi n 2. 3 2 . 9 3 . 7 2 . 9 2 . 6 2 . 3 3 . 1 3 . 2 2 . 6 2 . 1 3 . 0 2 . 0 st d e v 0. 7 1 . 0 1 . 0 0 . 6 1 . 9 2 . 1 1 . 0 5 . 9 0 . 8 1 . 4 1 . 6 1 . 4 42 Ta b l e 2 . 2 7 F e c a l C o l i f o r m ( c f u / 1 0 0 m l ) 2 0 0 6 a t t h e L o w e r C a p e F e a r R i v e r P r o gra m s t a t i o n s . T h e N C S t a t e s t a n d a r d i s 2 0 0 c f u / 1 0 0 m L f o r a l l s t a t i o n s ex c e p t S P D a n d M 2 3 d u e t o t h e i r s t a t u s a s s h e l l f i s h i n g w a t e r s ( 1 4 c f u / 1 0 0 m L ) . NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C 1 1 A C D P I C N C F 6 JA N 25 2 5 2 0 5 2 3 6 4 4 2 5 7 9 9 JA N 22 1 8 9 2 4 4 4 FE B 181 1 1 3 9 7 5 1 1 5 1 FE B 5 5 1 8 1 8 2 5 MA R 11 2 0 9 1 1 1 4 2 4 4 2 7 1 3 MA R 11 1 4 2 7 4 6 6 0 AP R 13 4 2 2 2 1 1 1 5 2 1 4 1 0 6 AP R 16 8 8 4 6 MA Y 66 6 2 2 7 4 0 5 6 2 5 3 3 5 1 3 8 MA Y 54 7 2 6 6 6 4 6 4 JU N 50 4 0 8 4 1 9 3 0 4 8 1 7 2 1 1 0 JU N 22 0 2 4 1 1 5 8 JU L 33 1 7 2 0 7 1 4 0 0 1 1 0 0 7 5 0 4 1 2 8 2 2 JU L 11 1 7 1 9 2 6 2 0 AU G 40 5 8 1 2 0 2 0 7 4 1 9 6 1 4 2 AU G 18 0 1 2 0 0 3 5 3 0 1 6 0 SE P 48 0 3 2 0 1 2 0 1 4 0 4 8 0 2 2 0 1 8 0 1 2 0 8 0 5 6 SE P 14 8 2 1 2 2 8 9 1 2 0 2 2 8 OC T 22 4 0 4 0 2 6 3 9 8 1 1 6 1 0 OC T 11 6 1 7 3 7 6 0 NO V 84 7 8 9 2 9 4 5 2 4 0 6 2 1 6 NO V 68 4 6 1 6 0 1 1 2 1 0 4 DE C 37 8 8 4 0 8 4 3 1 4 0 3 3 4 4 1 3 6 0 DE C 48 6 0 7 6 5 4 4 0 me a n 7 3 6 7 5 1 4 8 1 0 3 1 3 1 8 8 1 9 1 5 1 7 m e a n 4 7 1 4 0 6 2 4 6 7 6 st d d e v 124 8 0 4 0 4 0 1 5 3 2 9 7 2 0 5 3 4 2 1 1 9 st d d e v 57 3 2 4 8 0 3 5 5 8 ma x 48 0 3 2 0 1 2 0 1 4 0 4 8 0 1 1 0 0 7 5 0 1 2 0 8 0 6 0 ma x 18 0 1 2 0 0 2 8 9 1 2 0 2 2 8 mi n 111 1 9 9 7 2 1 1 1 1 mi n 15 8 8 2 0 Ge o m e a n 38 4 4 3 6 3 3 4 6 3 1 1 2 5 7 9 Ge o m e a n 18 3 1 3 4 3 4 6 0 AN C S A R G S N C 4 0 3 P B L R C R O C B C 1 1 7 B C R R 6 R C L C O G C O S R B R N H A M N C F 1 1 7 B 2 1 0 C O L L V C 2 S C - C H JA N 18 0 2 4 0 6 2 1 4 0 1 2 4 1 0 8 1 1 6 6 5 0 5 4 0 JA N 80 1 0 8 1 2 0 7 6 1 6 0 8 8 0 JA N 50 5 3 2 0 2 9 FE B 52 4 4 2 7 3 5 6 0 1 8 0 9 0 6 3 3 5 0 FE B 47 4 6 2 5 3 0 5 8 1 1 0 FE B 18 4 8 2 9 2 4 9 0 MA R 44 6 7 2 9 1 6 4 1 6 0 5 9 5 2 4 0 0 3 1 4 MA R 86 2 9 2 0 4 6 7 3 1 4 0 MA R 52 3 6 2 7 2 5 7 4 AP R 78 9 6 1 4 6 5 2 7 5 0 4 1 8 0 4 1 3 0 8 AP R 19 1 5 1 2 3 3 4 9 1 2 0 AP R 35 1 9 3 5 6 6 1 8 0 MA Y 84 2 3 7 6 2 8 4 1 2 4 8 6 1 4 9 8 0 0 2 7 1 MA Y 12 0 0 1 8 0 0 5 6 0 1 2 0 0 1 5 0 1 2 0 0 MA Y 35 4 0 3 8 8 0 4 2 JU N 22 0 2 2 0 2 0 0 1 8 0 1 , 3 0 0 2 5 0 2 6 0 4 2 0 0 3 8 0 0 JU N 1 3 1 1 0 9 2 2 2 1 2 8 JU N 33 4 0 4 2 6 8 8 8 JU L 52 3 0 0 3 4 0 9 2 6 0 0 1 2 8 1 5 6 6 4 1 4 4 JU L 55 1 6 4 3 8 9 1 8 0 0 1 4 6 JU L 42 4 2 2 2 8 8 7 2 AU G 70 0 9 0 0 3 0 0 0 8 0 0 3 , 0 0 0 7 5 0 3 0 0 0 1 6 0 0 1 8 0 0 AU G 14 4 5 6 2 6 3 0 0 0 2 0 0 2 3 2 AU G 50 0 1 3 7 1 6 0 1 2 0 0 7 0 0 SE P 14 5 8 0 0 1 0 0 6 5 0 1 0 0 0 2 2 5 0 9 0 0 2 7 0 0 2 1 5 0 SE P 17 0 7 3 1 0 0 1 6 0 1 2 5 0 7 0 0 SE P 12 0 0 4 0 0 2 2 0 1 2 0 0 5 6 0 OC T 73 2 0 0 2 8 0 1 7 3 6 0 0 0 4 6 7 3 4 3 0 4 6 OC T 55 4 5 4 5 9 1 1 8 5 2 5 0 OC T 46 5 4 4 6 4 2 1 1 6 NO V 56 0 3 6 0 8 4 4 4 0 1 1 2 8 8 0 4 0 0 6 2 0 3 6 0 NO V 62 7 0 1 7 1 8 8 4 9 8 NO V 76 2 6 0 1 4 0 1 5 6 0 3 8 0 DE C 80 4 0 0 1 0 8 8 0 9 6 1 2 0 8 0 1 6 4 1 3 DE C 25 5 2 0 0 9 1 9 1 6 0 0 0 7 0 0 DE C 42 6 4 3 5 7 0 3 5 me a n 1 8 9 3 2 2 3 7 0 2 4 1 1 1 1 1 4 0 8 4 4 6 9 7 8 8 4 1 m e a n 1 8 1 2 2 0 8 9 4 1 1 7 5 3 3 9 2 m e a n 1 7 7 9 9 6 8 3 7 1 2 1 2 st d d e v 20 6 2 5 9 7 9 9 2 4 1 1 6 8 1 6 1 6 8 0 3 1 2 2 0 1 1 0 5 st d d e v 31 5 4 7 9 1 4 7 8 4 1 1 6 2 1 3 6 1 st d d e v 33 3 1 1 0 6 4 5 5 5 2 1 9 ma x 70 0 9 0 0 3 0 0 0 8 0 0 6 0 0 0 2 2 5 0 3 0 0 0 4 2 0 0 3 8 0 0 ma x 12 0 0 1 8 0 0 5 6 0 3 0 0 0 6 0 0 0 1 2 0 0 ma x 12 0 0 4 0 0 2 2 0 1 5 6 0 7 0 0 mi n 44 4 4 2 7 3 5 6 0 4 1 5 2 4 1 1 3 min 1 1 5 1 0 1 8 2 2 9 8 mi n 18 1 9 2 0 2 4 3 5 Ge o m e a n 12 1 2 3 0 1 3 0 1 5 4 4 0 0 1 7 9 1 8 5 4 1 7 3 3 8 Ge o m e a n 67 7 8 4 2 1 0 8 1 8 9 2 6 1 Ge o m e a n 66 6 5 4 8 1 1 1 1 3 1 43 051015202530 NA V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 S P D N C F 6 Salinity (psu) Fi g u r e  2. 1    Sa l i n i t y  at  th e  Lo w e r  Ca p e  Fe a r  Ri v e r  Pr o g r a m  es t u a r i n e   st a t i o n s ,  19 9 5 ‐20 0 5  ve r s u s  20 0 6 . 19 9 5 ‐20 0 5 20 0 6 44 0. 0 1. 0 2. 0 3. 0 4. 0 5. 0 6. 0 7. 0 8. 0 9. 0 10 . 0 NC 1 1 A C D P I C N A V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 N C F 1 1 7 N C F 6 B 2 1 0 B B T Dissolved Oxygen (mg/L) Fi g u r e  2. 2    Di s s o l v e d  Ox y g e n  at  th e  Lo w e r  Ca p e  Fe a r  Ri v e r  Pr o g r a m   ma i n s t e m  st a t i o n s ,  19 9 5 ‐20 0 5  ve r s u s  20 0 6 . 19 9 5 ‐20 0 5 20 0 6 45 051015202530 NC 1 1 A C D P I C N A V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 N C F 1 1 7 N C F 6 B 2 1 0 B B T Field Turbidity (NTU) Fi g u r e  2. 3    Fi e l d  Tu r b i d i t y  at  th e  Lo w e r  Ca p e  Fe a r  Ri v e r  Pr o g r a m   ma i n s t e m  st a t i o n s ,  19 9 5 ‐20 0 5  ve r s u s  20 0 6 . 19 9 5 ‐20 0 5 20 0 6 46 0 20 0 40 0 60 0 80 0 10 0 0 12 0 0 14 0 0 16 0 0 18 0 0 NC 1 1 A C D P I C N A V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 N C F 1 1 7 N C F 6 B 2 1 0 Total Nitrogen (µg/L) Fi g u r e  2. 4    To t a l  Ni t r o g e n  at  th e  Lo w e r  Ca p e  Fe a r  Ri v e r  Pr o g r a m   ma i n s t e m  st a t i o n s ,  19 9 6 ‐20 0 5   ve r s u s  20 0 6 . 19 9 5 ‐20 0 5 20 0 6 47 020406080 10 0 12 0 14 0 16 0 18 0 20 0 NC 1 1 A C D P I C N A V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 N C F 1 1 7 N C F 6 B 2 1 0 Total Phosphorus (µg/L) Fi g u r e  2. 5    To t a l  Ph o s p h o r u s  at  th e  Lo w e r  Ca p e  Fe a r  Ri v e r  Pr o g r a m   ma i n s t e m  st a t i o n s ,  19 9 5 ‐20 0 5  ve r s u s  20 0 6 . 19 9 5 ‐20 0 5 20 0 6 48 020406080 10 0 12 0 14 0 16 0 18 0 20 0 NC 1 1 A C D P I C N A V H B B R R M 6 1 M 5 4 M 4 2 M 3 5 M 2 3 M 1 8 N C F 1 1 7 N C F 6 B 2 1 0 Fecal Coliform Bacteria (cfu/100 mL) Fi g u r e  2. 6    Fe c a l  Co l i f o r m  Ba c t e r i a  at  th e  Lo w e r  Ca p e  Fe a r  Ri v e r  Pr o g r a m   ma i n s t e m  st a t i o n s ,  19 9 6 ‐20 0 5  ve r s u s  20 0 6 . 19 9 6 ‐20 0 5 20 0 6 49 3.0 Water Quality Evaluation by Subbasin in the Lower Cape Fear River System Matthew R. McIver, Michael A. Malin and James F. Merritt Aquatic Ecology Laboratory Center for Marine Science University of North Carolina Wilmington This section details an evaluation of water quality within each subbasin for dissolved oxygen, turbidity, chlorophyll a, fecal coliform bacteria and some nutrient species at the LCFRP sampling sites. Monthly data from January to December 2006 are used in the comparisons. 3.1 Introduction The NC Division of Water Quality prepares a basinwide water quality plan for each of the seventeen major river basins in the state every five years (NCDENR, DWQ Cape Fear River Basinwide Water Quality Plan, October 2005). The basinwide approach is a nonregulatory watershed-based approach to restoring and protecting the quality of North Carolina’s surface waters. The first basinwide plan for the Cape Fear River was completed in 1996 and five-year interval updates have been completed in 2000 and 2005. The goals of the basinwide program are to: - Identify water quality problems and restore full use to Impaired waters. - Identify and protect high value resource waters. - Protect unimpaired waters while allowing for reasonable economic growth. DWQ accomplishes these goals through the following objectives: - Collaborate with other agencies to develop appropriate management strategies. - Assure equitable distribution of waste assimilative capacity. - Better evaluate cumulative effects of pollution. - Improve public awareness and involvement. The US Geological Survey (USGS) identifies 6 major hydrological areas in the Cape Fear River Basin. Each of these hydrologic areas is further divided into subbasins by DWQ. There are 24 subbasins within the Cape Fear River basin, each denoted by 6- digit numbers, 03-06-01 to 03-06-24 (NCDENR-DWQ, October 2005). All surface waters in the state are assigned a primary classification that is appropriate to the best uses of that water. North Carolina’s Water Quality Standards Program adopted classifications and water quality standards for all the state’s river basins by 1963. The program remains consistent with the Federal Clean Water Act and its amendments. DWQ assesses ecosystem health and human health risk through the use of five use support categories: aquatic life, recreation, fish consumption, water supply and shellfish 50 harvesting. [Note: All waters east of Interstate 95 are considered impaired for fish consumption due to mercury levels in fish tissue.] These categories are tied to the uses associated with the primary classifications applied to NC rivers and streams. Waters are supporting if data and information used to assign a use support rating meet the criteria for that use category. If these criteria are not met then the waters are Impaired. Waters with inconclusive data and information are Not Rated. Waters where insufficient data or information are available to make an assessment are rated No Data. For ambient water quality monitoring criteria, DWQ uses water quality data collected by both their own monitoring system as well as several NPDES discharger coalitions including the Lower Cape Fear River Program. The parameters used to assess water quality in the aquatic life category include dissolved oxygen (DO), pH, chlorophyll a and turbidity as well as benthos and fish data. DWQ rates use support based on whether the NC State Water Quality Standard is exceeded as listed below: Standard exceeded in < 10% of samples = Supporting Standard exceeded in > 10% of samples = Impaired Less than 10 samples collected = Not Rated DO and pH standard exceeded in swamps = Not Rated *Some standards are written with more specific criteria and the reader should refer to the Basinwide Water Quality plan for complete details about the DWQ rating system (refer). 3.2 Methods The UNCW Aquatic Ecology Laboratory (AEL) has developed an evaluation system that incorporates some of the guidelines used by DWQ and utilizes data collected by the Lower Cape Fear River Program. This approach determines a water quality “rating” for the parameters dissolved oxygen, chlorophyll a, fecal coliform bacteria, field turbidity and the nutrient species nitrate-nitrite (referred to as nitrate) and total phosphorus. For dissolved oxygen, chlorophyll a, and fecal coliform bacteria we compare LCFRP data to the N.C. State Water Quality Standards (http://h2o.enr.state.nc.us/csu/index.htm). Fecal coliform bacteria data is analyzed considering human contact standards, not shellfishing standards. The NC DWQ does not have surface water quality standards for nitrate and total phosphorus. The AEL water quality status is based on levels noted to be problematic in the scientific literature and our own published research. Based on data from four years of nutrient addition bioassay experiments using water from the Black and Northeast Cape Fear Rivers, Colly Creek and Great Coharie Creek: the UNCW-AEL considers total phophorus levels of 500 µg/L potentially harmful to water quality in all the waters of the Cape Fear River watershed. Nitrate levels of 200 µg/L, 500 µg/L and 1,000 µg/L in small streams, mainstem blackwater stations (NCF117, NCF6, B210) and mainstem Cape Fear River stations, respectively, are considered harmful to water quality. These nutrient levels may lead to algal blooms, high bacteria levels and high biochemical 51 oxygen demand (BOD) in blackwater streams (Mallin et al., 2001; 2002; 2004). Water quality status for nutrient species at the mainstem Cape Fear River stations was evaluated with a higher standard for nutrients because its waters are quite different than the blackwater areas and are able to better assimilate higher nutrient levels. Our system lists a sampling location as having good quality (G) if the standard is exceeded in none or 1 sample out of 12 measurements (<10%), fair quality (F) if standard is exceeded in 2 or 3 or 12 of measurements (11-25%), or poor quality (P) if standard is exceeded in 4-12 out of 12 measurements (>25%). The 36 stations monitored by the LCFRP by subbasin: Subbasin # LCFRP Stations 03-06-16 BRN, HAM, NC11 03-06-17 LVC2, AC, DP, IC, NAV, HB, BRR, M61, M54, M42, M35, M23, M18, SPD 03-06-18 SR 03-06-19 6RC, LCO, GCO 03-06-20 COL, B210, BBT 03-06-21 N403 03-06-22 SAR, GS, PB, LRC, ROC 03-06-23 ANC, BC117, BCRR, NCF6, NCF117, SC-CH Each subbasin is addressed separately with a description and map showing the LCFRP stations. This will be followed by a summary of the information published in the October 2005 Cape Fear River Basinwide Water Quality Plan and water quality status discussion using the UNCW-AEL approach for the 2006 LCFRP data. 52 3.3 Cape Fear River Subbasin 03-06-16 Location: Cape Fear River upstream and downstream of Elizabethtown Counties: Bladen, Columbus, Cumberland, Pender Water bodies: Cape Fear River Municipalities: Elizabethtown, Dublin, White Lake, East Arcadia, Tar Heel NPDES Dischargers: 7 @ 13.7 million gallons per day Concentrated Swine Operations: 50 LCFRP monitoring stations (DWQ #): BRN (B8340050), HAM (B8340200), NC11 (B8360000) NC DWQ monitoring stations (DWQ #): Six ambient monitoring stations BRN HAM NC1 53 Subbasin 03-06-16 includes the Cape Fear River and many streams that drain coastal plain wetlands and bay lakes. Most of the watershed is forested with some agriculture present. The CFR Basinwide Water Quality Plan lists the following ratings for this subbasin: Aquatic Life Recreation Supporting 101.5 freshwater miles Supporting 115.1 freshwater miles Not Rated 40.1 freshwater miles Not Rated 4.8 freshwater miles Not Rated 1,593.2 freshwater acres No Data 153.1 freshwater miles No Data 131.4 freshwater miles No Data 2,510.8 freshwater acres No Data 917.6 freshwater acres *Brown’s Creek, rated as impaired in the 2000 CFRBWQP, was upgraded in the 2005 plan (NCDENR DWQ CFRWQBP, July 2000 and NCDENR DWQ CFRWQBP, October 2005). Lower Cape Fear River Program Evaluation Data collection: NC11 since June 1995, BRN & HAM since February 1996 Sampling relevance: Represents water entering the Lower Cape Fear River watershed from the middle basin (NC11). There are also concentrated animal operations within the area (BRN and HAM). BRN - representative of small tributaries of the Cape Fear River NC11 - main stem of Cape Fear River, deep channel, freshwater with slight tidal influence 54 All three sites in this subbasin had a good rating for dissolved oxygen, meeting the North Carolina State standard in all sampled months (Table 3.3.1). All sites within this subbasin had a good rating for chlorophyll a concentrations (Table 3.3.1). The North Carolina State standard for chlorophyll a of 40 µg/L was not exceeded at any station during 2006. Fecal coliform bacteria concentrations were low at NC11 which had a good rating with no sample over the NC State Standard for human contact waters of 200 CFU/100mL in 2006 (Table 3.3.1). BRN and HAM received a poor rating for fecal coliform bacteria concentrations exceeding the standard 33% of the time (Figure 3.3.1). All sites within this subbasin were found to have a good rating for field turbidity concentrations (Table 3.3.1). The North Carolina State Standard for turbidity of 50 NTU was not exceeded at any station during 2006. For nitrate, BRN rated as poor (42% above standard) and HAM rated as fair (25% above standard). A good rating was found at NC11 for both nutrient species and for total phosphorus at BRN and HAM. Table 3.3.1 UNCW AEL 2006 evaluation for subbasin 03-06-16 Station Dissolved Oxygen Chlorophyll a Fecal Coliform Field Turbidity Nitrate Total Phosphorus BRN G G P G P G HAM G G P G F G NC11 G G G G G G 55 Aquatic Ecology Laboratory, UNC Wilmington 56 Aquatic Ecology Laboratory, UNC Wilmington 57 3.4 Cape Fear River Subbasin 03-06-17 Location: Cape Fear River near Riegelwood, downstream to estuarine area near Southport Counties: Columbus, Pender, Brunswick, New Hanover Waterbodies: Cape Fear River and Estuary Municipalities: Wilmington, Southport NPDES Dischargers: 41 @ 99.9 million gallons per day Concentrated Swine Operations: 7 LCFRP monitoring stations (DWQ #): LVC2 (B8445000), AC (B8450000), DP (B8460000), IC (B9030000), NAV (B9050000), HB (B9050100), BRR (B9790000), M61 (B9750000), M54 (B9795000), M42 (B9845100), M35 (B9850100), M23 (B9910000), M18 (B9921000), SPD (B9980000) DWQ monitoring stations: NAV (B9050000), M61 (B9750000), M54(B9795000) LV A DP IC NAV HB BRR M61 M54 M42 M35 M23 M18 SPD 58 Subbason 03-06-17 includes the mainstem of the Cape Fear River, the Cape Fear River Estuary and many streams that drain the areas west of the River. Most of the watershed is forested with some urban areas including Wilmington and Southport. CFR Basinwide Water Quality Plan lists the following ratings for this subbasin: Aquatic Life Recreation Supporting 14,125.4 saltwater acres Supporting 21,092.3 saltwater acres Not Rated 2.0 saltwater acres Impaired 96.6 saltwater acres Impaired 6,457.0 saltwater acres Supporting 44.1 freshwater miles Supporting 75.4 freshwater miles Not Rated 5.6 coast miles Not Rated 22.3 freshwater miles Impaired 4.7 coast miles Not Rated 406.9 freshwater acres No Data 2,254.6 saltwater acres No Data 2,859.2 saltwater acres No Data 269.1 freshwater miles No Data 215.4 freshwater miles No Data 1,251.5 freshwater acres No Data 844.5 freshwater acres No Data 12.5 coast miles No Data 22.8 coast miles Lower Cape Fear River Program Assessment Data collection: Most stations since 1995, all sampled since 1998 Sampling relevance: Highly important estuary for fisheries productivity. Also receives point source discharge and non-point source pollution. AC - representative of riverine system channel HB - riverine station, upstream of HB – upper estuary, upstream of Wilmington 59 M35 – represents wide estuary Sites given a good rating for dissolved oxygen include LVC2, AC, DP, IC, M35, M23 and M18 (Table 3.4.1). Sites having a fair rating for dissolved oxygen, with the percentage of samples not meeting the standard shown in parentheses, are BRR (25%), M42 (17%) and SPD (17%). Sites having poor rating for dissolved oxygen, with the percentage of samples not meeting the standard shown in parentheses, are NAV (33%), HB (42%), M61 (33%) and M54 (33%). All sites within this subbasin had a good rating in terms of chlorophyll a concentrations (Table 3.4.1). None of the sampled locations exceeded the 40 µg/L North Carolina State standard on any sample occasion during 2006. Sites within this subbassin rated as good quality for fecal coliform bacteria concentrations include DP, IC, NAV, HB, BRR, M61, M35, M23, M18, SPD (Table 3.4.1). Sites having a fair rating for Fecal coliform bacteria, with the percentage of samples not meeting the standard shown in parentheses, are LVC2 (25%), AC (17%), M54 (17%) and M42 (17%). No sites had a poor rating during 2006. All the LCFRP sites in this subbasin had a good rating for field turbidity except M54 (rated fair with 17% of samples above the standard) in the middle estuary (Table 3.4.1). The station NAV and those upstream were evaluated using the NC State Standard for freshwater of 50 NTU while all stations downstream of NAV were evaluated with the NC State Standard for brackish waters of 25 NTU. All the LCFRP sites in this subbasin had a good rating for nitrate and total phosphorus except LVC2 (Table 3.4.1). LVC2 exceeded the standard for nitrate 17% of the time for a fair quality status. 60 Table 3.4.1 UNCW AEL 2006 evaluation for subbasin 03-06-17 Station Dissolved Oxygen Chlorophyll a Fecal Coliform Field Turbidity Nitrate Total Phosphorus LVC2 G G F G F G AC G G F G G G DP G G G G G G IC G G G G G G NAV P G G G G G HB P G G G G G BRR F G G G G G M61 P G G G G G M54 P G F F G G M42 F G F G G G M35 G G G G G G M23 G G G G G G M18 G G G G G G SPD F G G G G G 61 Figure 3.4.1 Dissolved oxygen concentrations (mg/L) at NAV, HB and M61 for 2005. The dashed line shows the NC State Standard of 5.0 mg/L. 0 2 4 6 8 10 12 JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC Di s s o l v e d O x y g e n ( m g / L ) NAV HB M61 62 3.5 Cape Fear River Subbasin 03-06-18 Location: South River headwaters above Dunn down to Black River Counties: Bladen, Cumberland, Harnett, Johnston, Sampson Waterbodies: South River, Mingo Swamp Municipalities: Dunn, Roseboro NPDES Dischargers: 2 @ 0.08 million gallons per day Concentrated Swine Operations: 105 LCFRP monitoring stations (DWQ #): SR (B8470000) DWQ monitoring stations: none This subbasin is located on the inner coastal plain and includes the South River which converges with the Great Coharie Creek to form the Black River, a major tributary of the Cape SR 63 Fear River. Land use is primarily agriculture including row crops and concentrated animal operations. CFR Basinwide Water Quality Plan lists the following ratings for this subbasin: Aquatic Life Recreation Not Rated 52.1 freshwater miles Supporting 52.1 freshwater miles Not Rated 1,454.2 freshwater acres No Data 242.5 freshwater miles No Data 242.5 freshwater miles No Data 1,454.2 freshwater acres Lower Cape Fear River Program Assessment Data collection: Since February 1996 Sampling relevance: Below City of Dunn, hog operations in watershed SR – a slow black water tributary SR was found to have a poor rating for dissolved oxygen concentrations (Table 3.5.1). The North Carolina State Standard of 5.0 mg/L was not met 42% of the time and the swampwater standard of 4.0 mg/L was not 33% of the time. The lowest levels were found in late summer and early fall (Figure 3.5.1). SR had a good rating for chlorophyll a, with no samples exceeding the 40 µg/L North Carolina State Standard (Table 3.5.1). SR had a fair water quality status for fecal coliform bacteria concentrations, exceeding the NC State Standard of 200 CFU/100mL in 17% of samples (Table 3.5.1). The highest concentrations were in August (3,000 CFU/100mL) and May (1200 CFU/100mL). SR had a good rating for field turbidity, nitrate and total phosphorus (Table 3.5.1). 64 Table 3.5.1 UNCW AEL 2006 evaluation for subbasin 03-06-18 Station Dissolved Oxygen Field Turbidity Chlorophyll a Fecal Coliform Nitrate Total Phosphorus SR P G G F G G Figure 3.5.1 Dissolved oxygen concentrations (mg/L) at SR during 2006. The dashed line shows the NC State Standard for swampwater of 4.0 mg/L. 65 Aquatic Ecology Laboratory, UNC Wilmington 66 3.6 Cape Fear River Subbasin 03-06-19 Location: Three main tributaries of Black River near Clinton Counties: Sampson Waterbodies: Black River, Six Runs Ck., Great Coharie Ck., Little Coharie Ck. Municipalities: Clinton, Newton Grove, Warsaw NPDES Dischargers: 8 @ 6.8 million gallons per day Concentrated Swine Operations: 374 LCFRP monitoring stations (DWQ #): LCO (B8610001), GCO (B8604000), 6RC (B8740000) DWQ monitoring stations: none LC GCO 6R 67 This subbasin is located in the coastal plain within Sampson County. Land adjacent to the Black River is primarily undisturbed forest. There are numerous concentrated swine operations within this subbasin. CFR Basinwide Water Quality Plan lists the following ratings for this subbasin: Aquatic Life Recreation Supporting 71.3 freshwater miles Supporting 153.0 freshwater miles Not Rated 99.7 freshwater miles Not Rated 8.8 freshwater miles No Data 338.4 freshwater miles No Data 347.6 freshwater miles Lower Cape Fear River Program Assessment Data collection: February 1996 to present Sampling relevance: Many concentrated animal operations (CAOs) within the watershed, reference areas for point and nonpoint source pollution GCO - blackwater stream, drains riparian wetlands LCO and 6RC had a good rating for dissolved oxygen concentrations, with one measurement below the NC State Standard of 4.0 mg/L (Table 3.6.1). GCO had a fair rating for dissolved oxygen concentrations, not meeting the swampwater standard of 4.0 mg/L in 17% of the samples. All sites within this subbasin had a good rating for chlorophyll a and field turbidity concentrations (Table 3.6.1). GCO had a fair rating for fecal coliform bacteria with 17% of samples exceeding the NC State human contact standard of 200 CFU/100mL (Table 3.6.1). Both LCO and 6RC had a good rating for fecal coliform bacteria. Nitrate levels were rated poor at 6RC and LCO, exceeding 200 µg/L in 67% and 58% of the samples, respectively (Table 3.6.1, Figure 3.6.1). GCO had a fair rating for nitrate, having nitrate levels above 200 µg/L in 17% of the samples. 68 Total phosphorus was rated good at 6RC and LCO, and rated fair at GCO with levels above 500 µg/L 17% of the time (Table 3.6.1). Table 3.6.1 UNCW AEL 2006 evaluation for subbasin 03-06-19 Station Dissolved Oxygen Field Turbidity Chlorophyll a Fecal Coliform Nitrate Total Phosphorus 6RC G G G F P G LCO G G G G P G GCO F G G G F F Figure 3.6.1 Nitrate concentrations (µg/L) at 6RC, LCO, and GCO during 2006. The dashed line shows levels considered problematic in black water streams. 0 200 400 600 800 1,000 1,200 JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC Ni t r a t e - N i t r i t e ( µg/ L ) 6RC LCO GCO 69 Aquatic Ecology Laboratory, UNC Wilmington 70 Aquatic Ecology Laboratory, UNC Wilmington 71 Aquatic Ecology Laboratory, UNC Wilmington 72 3.7 Cape Fear River Subbasin 03-06-20 Location: Lower reach of Black River Counties: Pender Waterbodies: Black River, Colly Creek, Moores Creek Municipalities: Town of White Lake, Currie, Atkinson NPDES Dischargers: 2 at 0.82 million gallons per day Concentrated Swine Operations: 18 LCFRP monitoring stations (DWQ #): COL (B8981000), B210 (B9000000), BBT (none) DWQ monitoring stations: none COL B21 BBT 73 This subbasin is located on the coastal plain in Pender County and the land is mostly forested with some agriculture. The streams in this watershed typically have acidic black waters. The Black River in this area has been classified as Outstanding Resource Waters (ORW) (NCDENR DWQ Cape Fear River Basinwide Water Quality Plan, October 2005). The CFR Basinwide Water Quality Plan lists the following ratings for this subbasin: Aquatic Life Recreation Supporting 13.0 freshwater miles Supporting 34.9 freshwater miles Not Rated 77.9 freshwater miles No Data 199.8 freshwater miles Not Rated 576.0 freshwater acres No Data 576.0 freshwater miles No Data 143.8 freshwater acres Lower Cape Fear River Program Assessment Data collection: February 1996 to present Sampling relevance: Colly Creek is a pristine swamp reference site, B210 and BBT are middle and lower Black River sites COL – blackwater stream, drains large swamp area, very low pH B210 - Black River at Hwy 210 bridge 74 All three sites had a good rating for dissolved oxygen when using the NC State swampwater standard of 4.0 mg/L (Table 3.7.1). Chlorophyll a and field turbidity concentrations were low for each site within this subbasin and all sites had a good rating for these parameters (Table 3.7.1). Fecal coliform bacteria concentrations were generally low with COL rating as good and B210 rating as fair with samples exceeding the NC State standard 17% of the time (Table 3.7.1). BBT samples were not analyzed for fecal coliform bacteria. B210 rated good for nitrate concentrations and COL rated fair with samples exceeding the UNCW AEL recommended stream standard of 200 µg/L 17% of the time. For total phosphorus B210 and COL rated good (Table 3.7.1). BBT samples were not analyzed for total phosphorus. Table 3.7.1 UNCW AEL evaluation for subbasin 03-06-20 Station Dissolved Oxygen Field Turbidity Chlorophyll a Fecal Coliform Nitrate Total Phosphorus B210 G G G F G G COL G G G G F G BBT G G G na G na 75 Aquatic Ecology Laboratory, UNC Wilmington 76 3.8 Cape Fear River Subbasin 03-06-21 Location: Headwaters of NE Cape Fear River below Mount Olive Counties: Duplin, Wayne Waterbodies: Northeast Cape Fear River Municipalities: Mount Olive NPDES Dischargers: 6 @ 1.4 million gallons per day Concentrated Swine Operations: 75 LCFRP monitoring stations (DWQ#): NC403 (B9090000) DWQ monitoring stations: NC403 This subbasin includes the headwaters of the Northeast Cape Fear River and small tributaries. This section of the NE Cape Fear River is very slow moving and somewhat congested with macrophytic growth. Most of the watershed is forested and there is significant agriculture in the basin. NC403 77 The CFR Basinwide Water Quality Plan lists the following ratings for this subbasin: Aquatic Life Recreation Supporting 21.7 freshwater miles Supporting 57.3 freshwater miles Not Rated 38.9 freshwater miles No Data 88.1 freshwater miles No Data 84.7 freshwater miles Lower Cape Fear River Program Assessment Data collection: June 1997 – present Sampling relevance: Below Mount Olive Pickle Plant NC403 - slow moving headwaters of NE Cape Fear River NC403 had a poor rating for dissolved oxygen concentrations, not meeting the NC State swampwater standard of 4.0 mg/L in 33% of the samples (Table 3.8.1, Figure 3.8.1) NC403 had a good rating for chlorophyll a, yet there is very high aquatic macrophyte biomass present, often times completely covering and blocking the waterway (Table 3.8.1). As we have noticed at several of our stations over the years, chlorophyll a, a measurement of phytoplankton biomass, and often used as an indicator of eutrophic conditions, is not always adequate to determine problematic conditions with regard to aquatic flora. Field turbidity was rated as good at NC 403 (Table 3.8.1). NC403 had a fair rating for fecal coliform bacteria with samples exceeding the NC State standard for human contact (200 cfu/100 mL) 25% of the time. High nitrate levels at NC403 led to a poor rating, with nitrate concentrations >200 µg/L for 50% of the samples (Table 3.8.1, Figure 3.8.1). UNCW AEL researchers are concerned about the elevated nitrate levels that are periodically found at this site since these levels increase the likelihood of algal blooms and excessive aquatic macrophyte growth. Total phosphorus concentrations exceeded the UNCW AEL recommended harmful level on three occasions, giving this site a fair rating. 78 Table 3.8.1 UNCW AEL 2006 evaluation for subbasin 03-06-21 Station Dissolved Oxygen Field Turbidity Chlorophyll a Fecal Coliform Nitrate Total Phosphorus NC403 P G G F P F Figure 3.8.1 Dissolved oxygen (mg/L) and nitrate (µg/L) concentrations at NC403 during 2006. The dashed lines show the NC State DO standard of 4.0 mg/L for swampwater and the UNCW AEL recommended level of 200 µg/L for nitrate. 79 3.9 Cape Fear River Subbasin 03-06-22 Location: NE Cape Fear River and tributaries in the vicinity of Kenansville Counties: Duplin Waterbodies: Northeast Cape Fear River, Rockfish Creek Municipalities: Beulaville, Kenansville, Rose Hill and Wallace NPDES Dischargers: 13 @ 9.9 million gallons per day Concentrated Swine Operations: 449 LCFRP monitoring stations (DWQ #): PB (B9130000), GS (B9191000), SAR (B9191500), LRC (9460000) ROC (B9430000) DWQ monitoring stations: none PB GS SAR ROC LRC 80 Land coverage in this watershed is mostly forested with significant agriculture, including row crops and a dense concentration of animal operations (poultry and swine). The CFR Basinwide Water Quality Plans lists the following ratings for this subbasin: Aquatic Life Recreation Supporting 51.1 freshwater miles Supporting 73.2 freshwater miles Not Rated 72.1 freshwater miles Not Rated 3.0 freshwater miles Impaired 50.1 freshwater miles No Data 505.9 freshwater miles No Data 408.8 freshwater miles Lower Cape Fear River Program Assessment Data collection: February 1996 to present Sampling relevance: Below point and non-point source discharges PB – slow moving swamp-like stream ROC - Rockfish Creek below Wallace 81 All sites in this subbasin were rated using the dissolved oxygen NC State swampwater standard of 4.0 mg/L. SAR, PB, LRC and ROC all had a good rating (Table 3.9.1). GS had a poor rating with DO values dropping below the standard 50% of the time. All sites had a good rating for field turbidity concentrations (Table 3.9.1). Mean levels were less than 10 NTU for all sites within this subbasin for the 2006. For chlorophyll a concentrations all sites had a good rating, with no value exceeding the NC State standard of 40 µg/L (Table 3.9.1). For fecal coliform bacteria concentrations, using the NC State standard of 200 CFU/100 mL for human contact, GS had a fair rating (Table 3.9.1). SAR, PB, LRC and ROC all had a poor rating with 67%, 50%, 33% and 33% of samples above the standard, respectively. Fecal coliform bacteria concentrations are shown graphically in Figure 3.9.1. For nitrate, GS had a fair rating (Table 3.9.1). SAR, PB, LRC, and ROC all had a poor rating with levels exceeding the UNCW AEL standard (200 µg/L) 50%, 50%, 42% and 58% of the time, respectively. Nitrate levels for SAR, PB, LRC and ROC are shown graphically in Figure 3.9.2. For total phosphorus all sites had a good rating (Table 3.9.1). Table 3.9.1 UNCW AEL 2006 evaluation for subbasin 03-06-22 Station Dissolved Oxygen Field Turbidity Chlorophyll a Fecal Coliform Nitrate Total Phosphorus SAR G G G P P G GS P G G F F G PB G G G P P G LRC G G G P P G ROC G G G P P G 82 Figure 3.9.1 Fecal coliform bacteria concentrations (CFU/100mL) during 2006. The dashed line is the NC State Standard for human contact of 200 cfu/100mL. Figure 3.9.2 Nitrate-N concentrations (µg/L) at SAR, PB, LRC and ROC during 2006. The dashed line represents the UNCW AEL suggested threshold for good water quality. 83 Aquatic Ecology Laboratory, UNC Wilmington 84 Aquatic Ecology Laboratory, UNC Wilmington 85 3.10 Cape Fear River Subbasin 03-06-23 Location: Area near Burgaw and Angola swamp Counties: Pender Waterbodies: Northeast Cape Fear River,Burgaw Creek Municipalities: Burgaw NPDES Dischargers: 7 @ 3.8 million gallons per day Concentrated Swine Operations: 52 LCFRP monitoring stations (DWQ #): ANC (69), BCRR (82), BC117 (83), NCF117 (84), NCF6 (85) DWQ monitoring stations: NCF117 ANCBCRR BC117 NCF117 NCF6 86 This subbasin is located in the outer coastal plain where many streams are slow flowing blackwater streams that often dry up during the summer months. Most of the watershed is forested with some agriculture and increasing human development. The CFR Basinwide Water Quality Plan lists the following ratings for this subbasin: Aquatic Life Recreation Supporting 73.8 freshwater miles Supporting 39.5 freshwater miles Not Rated 36.8 freshwater miles Supporting 1.0 saltwater acre Impaired 23.4 freshwater miles Not Rated 11.6 freshwater miles Not Rated 8.3 freshwater miles No Data 324.5 freshwater miles No Data 233.2 freshwater miles Not Rated 1.0 saltwater acre Lower Cape Fear River Program Assessment Data collection: NCF117 & NCF6 since June 1995, others from February 1996 Sampling relevance: point and non-point source dischargers ANC - Angola Creek BC117 - Burgaw Canal at US 117 87 NCF117 - Northeast Cape Fear River at at US117 This subbasin had extensive dissolved oxygen problems with BC117 and BCRR having a good rating when using the 4.0 mg/L standard (Table 3.10.1). ANC, NCF6 and SC-CH had a fair rating with sub-standard samples 25%, 25% and 27% of the time, respectively. NCF117 had a poor rating, with substandard samples 33% of the time. DO levels for NCF117 are seen in Figure 3.10.1. NCF6 and SC-CH had fair ratings for field turbidity, while all other sites were rated good (Table 3.10.1). All sites in this subbasin had a good rating for chlorophyll a with averages for 2006 well below the standard of 40 µg/L. For fecal coliform bacteria, NCF6 had a good rating (Table 3.10.1). ANC, NCF117 and SC-CH had a fair rating, exceeding the human contact standard 25%, 17% and 27% of the time, respectively. BC117 and BCRR had a poor rating, exceeding the standard 67% and 75% of the time. Fecal coliform bacteria concentrations for BCRR and BC117 are shown in Figure 3.10.2. Nutrient loading of nitrate and total phosphorus was problematic at BC117 which had a poor rating for both (Table 3.10.1). BC117 had the highest nitrate and tp levels seen in the LCFRP system. These levels were far above the concentrations known to lead to algal bloom formation, bacterial increases and increased biochemical oxygen demand (BOD) in blackwater streams (Mallin et al. 2001, Mallin et al. 2002). 88 Table 3.10.1 UNCW AEL evaluation for subbasin 03-06-23 Station Dissolved Oxygen Field Turbidity Chlorophyll a Fecal Coliform Nitrate Total Phosphorus ANC F G G F F G BC117 G G G P P P BCRR G G G P G G NCF117 P G G F G G NCF6 F F G G G G SC-CH F F G F na na Figure 3.10.1 Dissolved oxygen concentrations (mg/L) at NCF117for 2006. The dashed line shows NC State swampwater standard of 4.0 mg/L. 89 Figure 3.10.2 Fecal coliform bacteria concentrations (CFU/100mL) at BC117 and BCRR during 2006. The dashed line shows the NC State Standard for human contact waters of 200 CFU/100mL. 90 Aquatic Ecology Laboratory, UNC Wilmington 91 Aquatic Ecology Laboratory, UNC Wilmington 92 3.11 References Cited Mallin, M.A., L.B. Cahoon, D.C. Parsons and S.H. Ensign. 2001. Effect of nitrogen and phosphorus loading on plankton in Coastal Plain blackwater streams. Journal of Freshwater Ecology 16:455-466. Mallin, M.A., L.B. Cahoon, M.R. McIver and S.H. Ensign. 2002. Seeking science-based nutrient standards for coastal blackwater stream systems. Report No. 341. Water Resources Research Institute of the University of North Carolina, Raleigh, N.C. Mallin, M. A., M.R. McIver, S.H. Ensign and L.B. Cahoon. 2004. Photosynthetic and heterotrophic impacts of nutrient loading to blackwater streams. Ecological Applications14: 823-838. NCDENR-DWQ (North Carolina Department of Environment and Natural Resources-Division of Water Quality), Cape Fear River Basinwide Water Quality Plan. July 2000, Raleigh, N.C. NCDENR-DWQ (North Carolina Department of Environment and Natural Resources-Division of Water Quality), Cape Fear River Basinwide Water Quality Plan. October 2005, Raleigh, N.C.