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PPSP-MP-50 SURVEY OF WATER QUALITY AND FLOW IN MARYLAND COASTAL ZONE STREAMS: A DATA REPORT Prepared by Ecological Analysts, Inc. HUNT VALLEY/LETON CENTER 15 Loveton Circle Sparks, Maryland 21152 'I aT H O L |T. I 0 4ONIT I iNCOZ 'Ivj.vOD May 1983 TD M 1983 ION )~183~' l~~~~O ~11| Imi PPSP-MP-50 SURVEY OF WATER QUALITY AND FLOW IN MARYLAND COASTAL ZONE STREAMS: A DATA REPORT U - S. DEPARTMENT OF COMMERCE NOAA COASTAL SERVICES CENTER 2234 SOUTH HOBSON AVENUE CHARLESTON, SC 29405-2413 Prepared for Department of Natural Resources Power Plant Siting Program Tawes State Office Building, B-3 Annapolis, Maryland 21401 Prepared by Ecological Analysts, Inc. HUNT VALLEY/LOVETON CENTER 15 Loveton Circle Sparks, Maryland 21152 lroperty of CSc Library J~~L~~~May 1983 g ~~~~~~~~~~May 1983 CONTENTS Page ABSTRACT FOREWORD 1. INTRODUCTION 1-1 2. METHODS 2-1 3. RESULTS 3-1 FOR EWARD The purpose of this report is to present data collected during a two- month pilot study of water chemistry of freshwater tributaries to the Chesapeake Bay. The streams studied represent spawning habitat for various species of anadronious fish. This report is one of a series in a program directed toward assessing the significance of acid deposition to Maryland's resources. Ecological Analysts, Inc. performed this study under Contract P 57-83-02 with the Maryland Department of Natural Resources Power Plant Siting Program. Michael L. Bowman Associate Administrator Technical Affairs Power Plant Siting Program 1. INTRODUCTION Ecological Analysts was retained by the Maryland Department of Natural Resources Power Plant Siting Program to gather data pertaining to the potential impact of acid deposition on the water quality of small fresh- water tributaries in the Chesapeake Bay drainage system. The 23 streams chosen for this study, identified in Table I. and Figure 1, were selected from a list of 50 known spawning sites for anadromous species (alewife, blueback herring, white perch, and yellow perch) based upon a consider- ation of stream width (generally less than 6 m [20 ft]), stream cover (including both forested and open areas), and accessibility. In addition, an effort was made to include tributaries to each of the major drainage systems of the upper Bay--Potomac, Patuxent, Susquehanna, Choptank, and Nanticoke river basins. Each site was visited weekly during the months of March and April 1983. Streamflow, pH, temperature,. dissolved oxygen, and specific conductance were determined in the field, and samples were collected for laboratory analysis (alkalinity, dissolved aluminum, sulfate, and nitrate). Three streams--Broad Run, Church Creek, and Deer Creek--were designated for additional sampling associated with "precipitation events," defined operationally as the passage of a closed low-pressure system, a frornt, or a thunderstorm producing a minimum of 0.64 centimeters (0.25 in.) of rainfall. The purpose of this wet weather sampling was to provide a means of detecting changes in water quality in response to storm events; however, the period of study proved so unusually wet that the regular weekly data cannot be considered representative of dry weather conditions. The field and laboratory methods used in the study are described in Section 2. Section 3 presents the data. TABLE 1 SAMPLING STATION LOCATION AND LAND USE Site Land Use(a) No. Stream Name Station Location Flood Plain Upland County 1 Nanjemoy Creek Md. 6 DF DF Charles 2 Mattawoman Creek Bumpy Oak Road DF DF Charles unnamed tributary 3 Wheatley Run Md. 6 DF DF Charles 4 Plum Point Creek Md. 263 DF/M DF/AG/G Calvert 5 Lyons Creek Md. 4 DF DF Calvert 6 Magothy River Md. 648 DF DF Anne Arundel 7 Severn Run Dicus Mill Road DF DF Anne Arundel 8 North River Md. 450 DF/M DF Anne Arundel 9 Muddy Creek Md. 468 DF DF Anne Arundel 10 Stocketts Run Sands Road DF DF Anne Arundel 11 Broad Run Mt. Vista Road DF DF/AG Baltimore 12 Deer Creek Md. 161 DF DF/G Harford 13 Church Creek U.S. 40 M/DF DF Harford 14 Winters Run Md. 755 DF DF/G Harford 15 Great Bohemia Creek Telegraph Road DF AG Cecil 16 Long Branch Md. 213 M/MF MF Cecil 17 Stony Run Razor Strap Road DF DF/G Cecil 18 Cypress Branch Md. 291 DF DF/R Kent 19 Morgan Creek Perkins Hill Road DF DF/AG Kent 20 Herring Branch Md. 299 DF DF/AG Kent 21 Granny Finley Branch Sparks Mill Road DF DF Queen Anne's 22 Choptank River Red Bridges Road DF DF Caroline 23 Tull Branch Smithville Raod DF MF Caroline (a) Land Use G = grassland M = marsh R = residential AG = agricultural land DF = deciduous forest MF = mixed deciduous and coniferous forest KEY MAP Cecil Harford17 13, Baltimore 8 ~~0 4 8 12 16 Fig~~~~~~~~~~ure1.LctoofamlnsttosseeTb 1frnamso stream adpcielciosfsamlngonts) 2. METHODS 2.1 FLOW MEASUREMENT Either a Teledyne Gurley Model 665 or Pygmy Model 625 current meter was used to measure streamflow. The former was used primarily when measure- ments had to be made from bridges, whereas the latter was used when wading was possible. These instruments were calibrated before and after use at the controlled velocity flume maintained at the Chesapeake Bay Institute. Water depth and velocity readings were taken at 10 stations across the stream. Velocity measurements were made at 0.6 depth below the surface in water depths less than 0.75 meters (2.5 ft). In depths greater than 0.75 meters, measurements were made at 0.2 and 0.8 depth below the surface. Stream discharge (m3/sec) was calculated by adding the products of cross-sectional area and average velocity for the 10 stations across the stream. The estimated accuracy of the stream discharge value is + 10 percent. At Deer Creek, high water usually prevented use of the method described above, and flows were estimated from measurements of current velocity and depth of water flowing over the spillway of a dam upstream of Md. Route 161. 2.2 ANALYTICAL METHODS Summaries of the methods of chemical analysis employed in this study are listed in Table 2. TABLE 2 SUMMARY OF ANALYTICAL METHODS Accuracy (% Recovery Detection Parameter Method No.(a) Sumlnary of Method except as Indicated) Precision Limit Conductance 120.1 Conductivity meter (in situ) 95-105 <5 -- pll 150.1 Electracetric (in situ) +0.1 unit O 0.1 unit -- Temperature 170.1 Thennistor (in situ) �0.2 C �0.2 C -- Dissolved oxygen 360.1 Membrane electrode (in situ) 95-105 tO.1 mg/l -- Dissolved aluminum 200 (Sec. 4.1.1) Filtration through 0.45 micron filter 202.2 Atomic absorption spectraoetry, 85-110 <3(b) 3 pg/l furnace Total alkalinity 310.1 Titrimetric to pll 4.5 -- <4(b) I mg/I Nitrite and nitrate 352.3 Colorihnetric, automated cadmium 95-120 <3(b) 0.01 mg/l reduction Sulfate 375.2 Colorimetric, automated methyl- 80-115 <5(b) 2 mg/l thymol blue (a) U.S. Environmental Protection Agency, 1979. Methods for Chemical Analysis of Water and Wastes. Environmental Monitoring and Support Laboratory, Cincinnati. (b) As percent coefficient of variation = 100 percent x (standard deviation/mean). 3. RESULTS Tables 3 through 10 contain the results of the weekly data collection at all 23 sampling stations. The results for Broad Run, Church Creek, and Deer Creek on 7, 18, and 21 March 1982 during or following precipitation events are presented in Tables 11 through 13. Caution should be used in the analysis and interpretation of the data for two reasons. First, two of the streams, Church Creek and Long Branch, are tidal . Consequently, any attempt to relate streamnflow to rainfall intensity is not likely to be productive. (Flow measurements were termiinated when it became obvious that the streams were tidal.) Second, it should not be inferred that the data in Tables 3 through 10 correspond to dry weather. In many cases, there was either rain on the day of sampling or high water as a result of heavy rain in the period prior to sampling. 3-1 TABLE 3 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURING THE WEEK OF 6-12 MARCH 1983 Stream Name (and Site Number) Mattawoman Creek Plum Nanjemoy Unnamed Wheatley Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter (1) (3) (4 _ (64) Date 8 MAR 8 MAR 8 MAR 8 MAR 8 MAR 7 MAR Time 0930 1127 1310 1435 1615 1630 Temp (C) 10.1 8.2 10.2 8,7 8.8 10.1 pH 5.5 6.3 6.2 6.7 6.3 6.9 DO (mg/1) 10.5 12.6 11.4 10.7 11.8 11.8 Conductivity (umho/cm) 56 94 80 123 123 185 Width (m) 9.75 3.35 3.50 6.10 5.18 4.72 Avg. depth (m) 0.65 0.18 0.11 0.54 0.57 0.15 Flow (m /sec) 1.19 0.15 0.09 0.37 1.47 0.08 Alkalinity (mg CaCO /1) 5 6.2 6.9 21.9 9.4 13.1 Dissolved Al (mg/1) 0.36 0,5 0.16 0.23 0.5 0.28 N03-N (mg/1) 0.04 0.53 0.30 0.13 0.98 1.24 S04 (mg/l) 11 12 10 17 24 18 Stream Name (and Site Number) Severn North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter (.. 8) (9) (10) (11) (12) Date 9 MAR 11 MAR 9 MAR 9 MAR 9 MAR 9 MAR Time 1140 1400 0832 0938 1614 1535 Temp(C) 7.7 7.8 7.2 7.2 7.5 7.5 pH 6.0 6.1 5.4 6.4 6.9 6.9 DO (mg/l) 11.5 11.4 10.2 12.2 11.7 12.7 Conductivity (pmho/cm) 108 80 104 90 70 128 Width (m) 7.32 10.97 3.35 4.32 3.96 28.65 Avg. deeth (m) 0.52 1,23 0.14 0.24 0.20 0.52 Flow (ma/sec) 1.52 0.90 0.04 0.45 0.17 9.33 Al kali nity (mg CaCO /1) 5.6 3.1 3.1 9.4 22.5 24.4 Dissolved Al (mg/1) 0.8 0.37 0.26 0.27 0.24 0.4 NO -N (mg/1) 0.49 0.24 0.51 0.97 1.21 2.2 S04 (mg/1) 16 14.5 25 24 12 10 3-2 TABLE 3 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) (14) (15) (16) (17) (18) Date 10 MAR 7 MAR 10 MAR 10 MAR 10 MAR 10 MAR Time 0932 1435 1247 1203 1055 1519 Temp(C) 6.7 10.6 8.3 7.3 6.4 7.7 pH 6.6 7.4 6.9 6.4 6.6 5.8 DO (mg/l) 11.7 12.6 11.8 11.6 12.9 11.7 Conductivity (pmho/cm) 109 99 171 101 2 2 Width (m) 10.06 23.16 5.18 7.92 9.75 16.15 Avg. depth (m) 1.31 0.64 0.16 0.89 0.49 0.64 Flow (m /sec) 3.26 2.52 0.18 1.08 5.36 4.57 Alkalinity (mg CaCO /1) 14.4 26.9 38.8 10.0 6.9 1.9 Dissolved a1 (mg/l) 2.1 0.19 0.25 0.6 4.0 0.6 N03-N (mg/l) 0.36 1.76 2.4 0.91 0.49 0.71 SO4 (mg/l) 13 10 19 17 12 13 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) (21) (22) (23) Date 10 MAR 10 MAR 11 MAR 11 MAR 11 MAR Time 1611 1402 0848 1004 1133 Temp (C) 8.0 7.7 7.7 8.2 9.1 pH 7.1 6.0 6.5 6.0 6.2 DO (mg/1) 10.0 11.8 11.2 10.7 11.0 Conductivity (Pmho/cm) 186 2 152 105 154 Width (m) 4.36 3.05 5.03 15.24 4.27 Avg. depth (m) 0.45 0.38 0.49 0.85 0.49 Flow (m /sec) 0.69 0.45 0.42 10.64 0.21 Al kalinity (mg CaCO /1) 41.5 6.2 18.1 7.2 7.2 Dissolved Al (mg/i) 2.2 0.5 0.6 0.8 0.27 NO3-N (mg/i) 1.21 0.56 2.2 0.99 6.1 so4 (mg/l) 10.3 10.8 12.4 17.4 9.1 3-3 TABLE 4 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURING THE WEEK OF 13-19 MARCH 1983 Stream Name (and Site Number) Mattawoman Creek Plum Nanjemoy Unnamed Wheatley Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter (1) (2) (3) (4) L (6) Date 14 MAR 14 MAR 14 MAR 14 MAR 14 MAR 15 MAR Time 0953 0830 1122 1342 1509 1128 Temp (C) 6.3 4.4 8.9 10.6 9.6 9.5 pH 5.6 5.9 5.8 6.3 6.3 6.3 DO (mg/1) 11.0 12.0 10.8 12.4 11.8 11.8 Conductivity (umho/cm) 55 82 76 123 144 155 Width (m) 9.60 3.35 3.50 3.66 4.72 3.96 Avg. denth (m) 0.40 0.12 0.11 0.22 0.40 0.15 Flow (m/sec) 0.27 0.05 0.06 0.17 0.86 0.06 Alkalinity (mg CaCO /1) 4.8 6.2 5,0 18.8 8.1 12.5 Dissolved 1l (mg/1) 0.26 0.10 0.06 0.12 0.09 0.31 N03-N (mg/l) 0.03 0,59 0.26 0.18 0.19 1.00 so0 (mg/l) 11 12 11 21 28 20 Stream Name (and Site Number) Severn North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter __ _(8) (9) (10) (11) (12) Date 15 MAR 15 MAR 14 MAR 14 MAR 15 MAR 15 MAR Time 1013 0856 1612 1704 1302 1409 Temp(C) 8,1 5.9 10.6 9.3 10.8 9.5 pH 6.0 5.6 5.6 6.3 6,5 6.8 DO (mg/1) 11.7 11.6 12.3 11.7 11.6 13.1 Conductivity (imho/cm) 108 87 109 128 122 116 Width (m) 6.02 4.27 3.20 4.27 3.73 28.35 Avg. death (m) 0.34 0.26 0.13 0.20 0.16 0.36 Flow (m6/sec) 0.40 0.21 0.03 0.35 0.08 4.91 Alkalinity (mg CaCO /1) 7.5 37.5 2.5 8.8 27.8 23,1 Dissolved a1 (mg/l) 0.29 0.07 0.09 0.11 0.14 0.06 No -N (mg/l) 1.03 0.23 0.47 1.01 1.51 2.7 SO (mg/l) 16 15 28 27 10 10 Note: NDT - Not determined because stream is tidal. 3-4 TABLE 4 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) (14) (15) (16) (17) (18) Date 16 MAR 15 MAR 16 MAR 16 MAR 16 MAR 16 MAR Time 0800 1543 1426 1223 1120 1650 Temp(C) 8.6 10.8 11.0 9.0 7.9 11.6 pH 6.0 6.8 7.8 6.2 6.4 5.9 DO (mg/l) 9.2 12.8 12.6 11.1 11.5 11.1 Conductivity (4mho/cm) 127 123 160 220 84 73 Width (m) NDT 23.16 4.88 13.11 7.09 5.69 Avg. deeth (m) NDT 0.45 0,68 0.71 0.16 0.35 Flow (m /sec) NDT 1.74 0.14 0.46 0.23 1.65 Alkalinity (mg CaCO /1) 30.6 24.4 39.4 11.2 12.5 4.4 Dissolved A1 (mg/i) 0.20 0.10 0.12 0.17 0.14 0.31 NO3-N (mg/l) 0.09 2.1 3.0 1.30 0.57 0.95 S04 (mg/l) 13 12 20 19 13 13 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) (20) (21) (22) (23) Date 17 MAR 16 MAR 17 MAR 17 MAR 17 MAR Time 0845 1537 1007 1136 1255 Temp (C) 6.0 11.8 7.2 9.0 9.5 pH 6.7 6.1 6.6 6.1 6.2 DO (mg/l) 10.6 11.2 11.8 11.1 11.8 Conductivity (Vmho/cm) 140 74 155 113 148 Width (m) 4.27 2.74 4.88 15.24 4.27 Avg. death (m) 0.26 0.39 0.67 0.38 0.15 Flow (m /sec) 0.16 0.13 0.26 3.96 0.19 Alkalinity (mg CaCO /1) 32.1 10.0 25.9 8.5 7.0 Dissolved Al (mg/1) 0.25 0.31 0.20 0.31 0.11 NO3-N (mg/l) 2.3 0.90 4.0 1.07 6.8 S04 (mg/l) 9 13 12 19 9 3-5 TABLE 5 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURING THE WEEK OF 20-26 MARCH 1983 Stream Name (and Site Number) Mattawoman Creek Plum Nanjemoy Unnamed Wheatley Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter (1) (2) (3) (4) (_ (6) Date 22 MAR 22 MAR 22 MAR 22 MAR 22 MAR 23 MAR Time 1000 0830 1200 1340 1500 1200 Temp (C) 9.8 7.2 11.2 9.8 9.9 9.5 pH 6.3 6.7 6.4 6.6 6.6 6.5 DO (mg/l) 10.4 12.2 11.9 11.4 11.8 10.6 Conduct ivity (omho/cm) 48 74 73 112 124 126 Width (m) 9.55 3.35 3.66 5.94 5.18 3.96 Avg. depth (m) 0.69 0.18 0.19 1.08 0.69 0.16 Flow (m3/sec) 1.76 0.15 0.22 1.17 1.90 0.14 Alkalinity (mg CaCO /1) 4.1 7.2 6.2 16.6 6.2 14.0 Dissolved Al (mg/l) 0.5 0.30 0.19 0.02 2.2 1.5 NO3-N (mg/l) 0.01 0.54 0.30 0.13 0.90 0.69 s04 (mg/l) 12 12 12 19 24 16 Stream Name (and Site Number) Severn f North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter (7) __8j_ L10) ()12 Date 23 MAR 23 MAR 22 MAR 23 MAR 23 MAR 23 MAR Time 1050 0950 1710 0840 1400 1510 Temp(C) 6.8 4.5 9.2 5.0 8.0 6.5 pH 6.4 6.9 6.6 7.1 6.9 6.9 DO (mg/l) 11.8 13.0 12.9 13.5 12.0 13.6 Conductivity (umho/cm) 96 67 110 118 120 122 Width (m) 6.10 4.57 3.40 4.57 3.40 39.93 Avg. denth (m) 0.75 0.34 0.18 0.27 0.30 0.18 Flow (mj/sec) 0.73 0.47 <0.06* 0.49 0.13 4.45 Alkalinity (mg CaCO /1) 4.1 2.1 3.1 7.2 21.2 20.2 Dissolved Al (mg/1) 0.5 0.18 0.34 0.20 0.16 0.38 NO3-N (mg/l) 0.61 0.16 0.52 1.06 1.40 2.5 S04 (mg/l) 20 16 26 25 10 11 Note: * - Stream clogged with debris; velocity below instrument threshold. NDT - Not determined because stream is tidal. 3-6 TABLE 5 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) (14) (15) (16) (17) (18) Date 23 MAR 24 MAR 24 MAR 24 MAR 24 MAR 24 MAR Time 1545 0830 1145 1100 1000 1325 Temp(C) 8.2 4.2 7.5 5.0 3.8 6.3 pH 6.8 6.4 6.8 6.6 7.0 6.6 DO (mg/i) 13.7 13.0 12.2 12.8 13.2 11.6 Conductivity (Umho/cm) 121 116 90 82 74 58 Width (m) NDT 22.25 4.88 NDT 7.48 16.46 Avg. depth (m) NDT 0.52 0.16 NOT 0.19 0.67 Flow (mn/sec) NDT 2.60 0.24 NDT 0.39 3.03 Alkalinity (mg CaCO /1) 19.7 18.6 17.6 6.2 10.4 5.2 Dissolved Al (mg/l) 0.02 0.14 3.7 0.5 0.14 0.8 NO3-N (mg/1) 0.27 4.0 0.99 1.12 0.68 0.70 S04 (mg/1) 12 22 18 19 22 13 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) ( 20) (21) (22) (23) Date 24 MAR 24 MAR 24 MAR 25 MAR 25 MAR Time 1430 1235 1600 0845 1000 Temp (C) 5.5 6.7 5.6 4.7 4.9 pH 6.6 6.7 6.7 6.4 6.6 DO (mg/1) 12.0 11.9 13.2 11.4 13.2 Conductivity (4mho/cm) 141 53 137 92 155 Width (m) 4.27 2.90 4.88 15.24 4.36 Avg. depth (m) 0.36 0.37 0.48 0.78 0.53 Flow (m3/sec) 0.23 0.32 0.49 8.53 0.28 Alkalinity (mg CaCO /1) 22.8 4.1 24.8 18.6 21.7 Dissolved a1 (mg/l) 1.8 0.8 0.5 0.8 0.18 N03-N (mg/1) 2.5 0.54 3.0 1.01 6.7 SO4 (mg/1) 13 13 16 20 12 3-7 TABLE 6 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURING THE WEEK OF 27 MARCH - 2 APRIL 1983 Stream Name (and Site Number) Mattawoman Creek P1 um Nanjemoy Unnamed Wheatley Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter ( 1) (2) (3)L (4) (5) (6) Date 29 MAR 29 MAR 29 MAR 29 MAR 29 MAR 28 MAR Time 0845 0745 1005 1135 1235 1200 Temp (C) 7.4 6.6 8.8 8.9 8.8 4.0 pH 5.2 5.7 5.3 5.3 5.6 6.2 DO (mg/1) 9.9 11.3 11.3 11.1 11.1 10.4 Conductivity (Umho/cm) 1075 68 1263 111 128 118 Width (m) 9.60 3.35 3.35 5.79 5.18 3.96 Avg. depth (m) 0.65 0.16 0.16 0.82 0.56 0.29 Flow (m /sec) 1.58 0.11 0.15 0.57 1.51 0.42 Alkalinity (mg CaCO /1) 1.0 4.1 3.1 17.6 8.3 9.8 Dissolved A1 (mg/i) 0.22 0.27 0.22 <0.002 0.12 0.18 NO3-N (mg/l) <0.01 0.51 0.31 0.16 1.06 0.84 SO4 (mg/i) 16 16 15 22 28 17 Stream Name (and Site Number) Severn North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter (7L_ (8) (9) (10) (11) (12) Date 28 MAR 28 MAR 28 MAR 28 MAR 28 MAR 28 MAR Time 1300 1400 1515 1615 0745 0915 Temp (C) 8.0 8,6 9.9 8.5 6.5 6.2 pH 5.1 5.1 5.4 7,0 6.4 6.3 DO (mg/l) 10.4 10.5 10.6 10.7 11.6 12.0 Conductivity (umho/cm) 54 57 273 105 89 87 Width (m) NDF 4.57 3.54 4.51 3.81 39.93 Avg. depth (m) NDF 0.44 0,16 0.30 0.35 0.36 Flow (m5/sec) NDF 0.72 0.08 0.70 0.28 17.36 Alkalinity (mg CaCO /1) 0.5 <0.5 1.0 7.2 16.6 17.6 Dissolved Al (mg/i) 2.1 0.08 0.26 0.28 1.1 0.8 NO3-N (mg/1) 0.26 0.15 0.47 0.86 1,06 1.61 S04 (mg/l) 15 16 26 26 18 15 Note: NDF - Not determined because of flooding. NDT - Not determined because stream is tidal. 3-8 TABLE 6 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) (14) (15) (16) (17) (18) Date 28 MAR 28 MAR 30 MAR 30 MAR 30 MAR 30 MAR Time 0945 1025 1015 0945 0845 1150 Temp (C) 6.5 6.7 7.9 5.3 3.6 7.8 pH 6.5 6.4 5.8 5.6 5.4 5.5 DO (mg/1) 11.7 11.4 11.0 11.1 12.9 10.8 Conductivity (umho/cm) 59 61 127 76 69 52 Width (m) NDT 22.71 4.88 NDT 7.47 15.24 Avg. depth (m) NDT 0.99 0.18 NDT 0.19 0.75 Flow (m /sec) NDT 9.94 0.48 NDT 0.47 3.17 Alkalinity (mg CaCO /1) 9.3 10.4 24.8 16.7 9.3 3.1 Dissolved A1 (mg/i) 1.1 0.5 1.8 0.19 <0.002 0.8 NO3-N (mg/l) 0.27 0.72 7.6 1.12 0.87 0.85 so04 (mg/l) 14 13 19 14 18 10 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) (20) (21) (22) (23) Date 30 MAR 30 MAR 30 MAR 30 MAR 30 MAR Time 1250 1100 1400 1525 1640 Temp (C) 6.1 8.0 7.5 8.6 10.1 pH 5.6 5.4 5.8 5.6 5.5 DO (mg/1) 10.5 10.1 10.7 10.1 10.7 Conductivity (Umho/cm) 130 49 130 76 141 Width (m) 4.27 2.90 4.91 15.39 4.42 Avg. depth (m) 0.36 0.36 0.47 1.04 0.58 Flow (md/sec) 0.26 0.31 0.45 12.25 0.24 Al kalinity (mg CaCO /1) 24.8 7.2 14.5 8.3 4.1 Dissolved Al (mg/l) 3.0 1.1 0.16 1.8 0.12 N03-N (mg/l) 2.9 0.60 2.9 0.87 6.6 SO4 (mg/l) 13 11 13 16 10 3-9 TABLE 7 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURING THE WEEK OF 3-9 APRIL 1983 Stream Name (and Site Number) Mattawoman Creek Plum Nanjemoy Unnamed Wheatley Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter (1) (2) (3) (4) (5) (6) Date 5 APR 5 APR 5 APR 5 APR 5 APR 4 APR Time 0900 0810 1030 1135 1240 1230 Temp (C) 10.1 7.3 11.0 10.0 10.6 11.8 pH 5.7 5.9 5.7 6.0 6.0 5.9 DO (mg/l) 9.3 11.0 10.3 11.5 10.6 9.2 Conductivity (umho/cm) 44 69 70 119 141 131 Width (m) 9.60 3.35 3.50 5.79 4.88 3.99 Avg. death (m) 0.60 0.15 0.16 0.84 0.47 0.18 Flow (m /sec) 0.75 0.09 0.17 0.40 1.15 0.14 Alkalinity (mg CaCO /1) 5.2 5.2 5.2 21.7 9.3 12.4 Dissolved a1 (mg/1) 0.21 0.17 0.16 0.20 0.40 0.5 NO-N (mg/l) 0.04 0.57 0.36 0.20 1.01 0.95 so4 (mg/l) 8 10 8 16 23 15 Stream Name (and Site Number) Severn North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter (7) _(8 (9) (10) (11) 12 Date 4 APR 4 APR 4 APR 4 APR 4 APR 4 APR Time 1330 1520 1700 1615 1100 0945 Temp (C) 11.2 15.6 14.8 12.6 9.5 9.6 pH 6.0 5.6 5.8 6.0 5.9 5.9 DO (mg/1) 9.6 9.5 10.5 9.6 10.7 10.7 Conductivity (umho/cm) 97 71 1381 1458 109 111 Width (m) 6.71 4.42 3.20 4.57 3.72 39.93 Avg. denth (m) 0.79 0.32 0.15 0.27 0.27 0.21 Flow (m /sec) 0.89 0.42 0.04 0.49 0.15 5.19 Alkalinity (mg CaCO /1) 4.1 3.1 3.1 7.2 23.8 21.7 Dissolved ;1 (mg/1) 0.5 0.17 0.18 0.20 0.32 0.15 NO3-N (mg/l) 0.57 0.12 0.55 0.94 1.22 2.2 so04 (mg/l) 14 11 23 20 7 9 Note: NOT - Not determined because stream is tidal. 3-10 TABLE 7 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) (14) (15) (16) (17) _I18) Date 4 APR 4 APR 6 APR 6 APR 6 APR 6 APR Time 0915 0800 1005 0915 0825 1150 Temp (C) 9.8 10.4 12.9 10.6 9.0 11.9 pH 5.8 5.7 6.0 5.9 6.0 5.9 DO (mg/1) 10.2 10.6 9.8 9.3 10.3 8.7 Conductivity (pmho/cm) 1489 98 164 105 77 71 Width (m) NDT 22.40 4.88 NDT 7.32 14.02 Avg. death (m) NDT 0.70 0.15 NDT 0.18 0.47 Flow (m /sec) NDT 2.08 0.21 NDT 0.36 1.81 Alkalinity (mg CaCO /1) 19.7 17.6 31.0 11.4 11.4 6.2 Diss lved Al (Xi/l) 0.6 1.2 0.24 0.23 0.21 0.26 N03-N (mg/l) 0.24 1.36 2.7 1.33 0.62 0.99 so4 (mg/l) 11 10 19 14 10 11 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) (20) (21) (22) (23) Date 6 APR 6 APR 6 APR 6 APR 6 APR Time 1350 1102 1450 1530 1651 Temp (C) 11.8 12.8 10.9 11.8 11.7 pH 5.9 6.0 6.2 6.0 6.1 DO (mg/1) 8.8 9.3 9.1 8.8 9.7 Conductivity (pmho/cm) 139 69 129 94 113 Width (m) 4.33 2.83 4.88 15.39 4.27 Avg. death (m) 0.36 0.31 0.41 0.78 0.47 Flow (m /sec) 0.22 0.20 0.34 7.65 0.24 Al kalinity (mg CaCO /1) 29.0 10.3 24.0 8.3 7.2 Dissolved Al (mg/i) 0.28 0.25 0.28 0.7 0.20 NO3-N (mg/l) 1.9 0.80 2.8 0.92 6.2 SO4 (mg/l) 8 10 11 17 9 3-11 TABLE 8 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURING THE WEEK OF 10-16 APRIL 1983 Stream Name (and Site Number) Mattawoman Creek Plum Nanjemoy Unnamed Wheatl ey Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter 2(1 (4) (5) Date 12 APR 12 APR 12 APR 12 APR 12 APR 11 APR Time 0845 0755 1017 1130 1245 1137 Temp (C) 8.8 7.5 11.6 13.0 12.2 10.0 pH 4.5 4.8 4.8 4,9 4.8 5.6 DO (mg/1) 10.4 12.1 11.4 11,0 10.5 11.0 Conductivi ty (pmho/cm) 41 65 71 120 124 104 Width (m) 9.60 3.35 3.66 5.94 6.70 4.11 Avg. depth (m) 0.82 0.19 0.23 1.04 0.66 0.28 Flow (m /sec) 2.65 0.23 0,43 0.83 2.40 0.51 Alkali nity (mg CaCO /1) 1.6 4.1 5.2 17.6 7.2 13.0 Dissolved Al (mg/l) 0.7 0.4 0.4 0.3 1.2 0.7 N03-N (mg/1) <0.01 0.56 0.32 0.11 0.96 0.64 s0o4 (mg/l) 9 10 9 17 20 11 Stream Name (and Site Number) Severn North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter l (7__ _. (10) (11) (1 2) Date 11 APR 11 APR 11 APR 11 APR 11 APR 11 APR Time 1240 1335 1545 1450 0736 0830 Temp (C) 9.6 10.7 12.5 10.6 8.3 8.1 pH 5.3 5.0 4.7 4.8 5.5 5.7 DO (mg/1) 10,9 10.2 10.0 10.6 11.7 11.6 Conductivity (pmho/cm) 68 53 81 86 107 94 Width (m) NDF 4.57 3.96 5.49 3.96 39.93 Avg. degth (m) NDF 0.66 0.29 0.48 0.33 0.30 Flow (mJ/sec) NDF 1.74 0.27 1.60 0.43 12.98 Alkalinity (mg CaCO /1) 6.2 2.1 2.6 5.7 22.0 17.6 Dissolved A1 (mg/l) 1.8 1.2 1.0 1.8 0.8 1.2 NO3-N (mg/l) 0.31 0,10 0.31 0.70 1.1 1.7 s04 (mg/i) 11 10 16 16 8 8 Note: NDF - Not determined because of flooding. NDT - Not determined because stream is tidal, 3-12 TABLE 8 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) (14) (15) (16) (17) (18) Date 11 APR 11 APR 13 APR 13 APR 13 APR 13 APR Time 0920 0947 0940 0910 0825 1105 Temp (C) 8.2 8.5 11.0 8.8 7.0 12.2 pH 5.8 5.4 7.5 7.6 7.8 7.2 DO (mg/l) 11.7 11.9 10.9 10.2 11.5 10.1 Conductivity (Vmho/cm) 86 85 120 91 76 57 Width (m) NDT 22.86 5.18 NDT 7.31 15.24 Avg. degth (m) NDT 0.87 0.19 NOT 0.20 0.87 Flow (md/sec) NDT 5.56 0.26 NDT 0.50 4.36 Alkalinity (mg CaCO /1) 18.6 15.0 22.8 9.3 10.4 5.2 Dissolved Al (mg/i) 1.0 2.9 2.0 1.1 0.2 0.7 NO -N (mg/l) 0.30 0.98 1.3 1.1 0.61 0.71 S04 (mg/l) 8 9 12 11 10 9 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) (20) (21) (22) (23) Date 13 APR 13 APR 13 APR 13 APR 13 APR Time 1205 1045 1310 1410 1525 Temp (C) 11.1 11.3 12.3 12.8 14.4 pH 7.4 7.6 7.4 7.6 7.4 DO (mg/l) 10.2 11.0 10.7 9.4 10.7 Conductivity (jmho/cm) 147 55 136 77 149 Width (m) 4.27 2.90 5.03 15.24 4.72 Avg. de th (m) 0.38 0.44 0.57 1.38 0.66 Flow (m3/sec) 0.31 0.38 0.66 17.52 0.39 Alkalinity (mg CaCO /1) 29.0 7.2 21.0 6.2 7,2 Dissolved ~1 (mg/i) 1.6 0.7 0.3 1.3 0.3 NO3-N (mg/l) 2.7 0.62 2.6 0,74 6.1 So4 (mg/l) 9 9 11 14 9 3-13 TABLE 9 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURING THE WEEK OF 17-23 APRIL 1983 Stream Name (and Site Number) Mattawoman Creek Plum Nanjemoy Unnamed Wheatley Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter j (1) 14) (5) Date 18 APR 18 APR 18 APR 18 APR 18 APR 18 APR Time 1200 1100 1334 1445 1540 0935 Temp (C) 9.3 8.2 12.5 12.3 11.1 10.2 pH 5.4 5.4 5.2 5.5 5.4 5.3 DO (mg/1) 11.0 12.5 11.6 11.4 11.9 11.1 Conductivity (pmho/cm) 37 57 56 109 123 96 Width (m) 9.60 3.20 3.66 NDE NDE 3.96 Avg. depth (m) 0.60 0.21 0.21 NDE NDE 0.18 Flow (m /sec) 0.93 0.15 0.44 NDE NDE 0.20 Alkalinity (mg CaCO /1) 0.3 0.3 11.8 16.6 8.3 13.4 Dissolved Al (mg/i) 0.7 0.1 1.0 0.2 0.2 1.6 NO3-N (mg/1) 0.05 1.1 0.57 0.15 2,3 0.72 s04 (mg/l) 11 11 11 18 25 16 Stream Name (and Site Number) Severn North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter _LL 1L. 2 (10 (11) (12) Date 19 APR 19 APR 18 APR 18 APR 19 APR 19 APR Time 0845 0750 1614 1700 1057 1150 Temp (C) 8.4 6.5 12.0 10.5 7.6 8.1 pH 504 4.9 5.1 5.5 5.6 5.6 DO (mg/1) 11.4 11.9 12.7 11.7 12.5 12,2 Conductivity (umho/cm) 88 60 88 103 98 100 Width (m) NDE 4.42 3.35 4.72 3.90 39.92 Avg. depth (m) NDE 0,35 0.17 0.31 0.30 0.27 Flow (mJ/sec) NDE 0.48 0.10 0.86 0.19 10.33 Alkali nity (mg CaCO /1) 5.2 2.1 2.1 7.2 22.8 17.6 Dissolved Al (mg/i) 0,5 0.1 0.1 0.1 0.2 0.1 NO-N (mg/1) 0.82 0.18 1.4 1.9 1.4 2.8 so4 (mg/i) 17 14 26 22 9 10 Note: NDE - Not determined because of equipment malfunction, NDT - Not determined because stream is tidal. 3-14 TABLE 9 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) (14) (15) (16) (17) (18) Date 19 APR 19 APR 20 APR 20 APR 20 APR 20 APR Time 1230 1250 0947 0910 0825 1105 Temp (C) 7.7 8.6 7.7 5.3 4.6 6.0 pH 5.7 5.6 5.6 5.6 5.6 5.5 DO (mg/1) 12.7 12.1 12.1 12.7 13.9 12.6 Conductivity (Umho/cm) 103 102 126 88 78 60 Width (m) NDT NDE 5.33 NDT 7.47 14.32 Avg. depth (m) NDT NDE 0.18 NDT 0.21 0.62 Flow (mJ/sec) NDT NDE 0.33 NDT 0.50 3.11 Alkalinity (mg CaCO /1) 22.8 22.8 21.7 10.3 10.3 10.3 Dissolved Al (mg/i) 0.3 0.2 0.6 0.4 0.2 0.9 NO3-N (mg/1) 0.28 2.0 2.0 1.5 0.61 1.4 So4 (mg/l) 11 13 17 14 12 12 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) (20) (21) (22) (23) Date 20 APR 20 APR 20 APR 20 APR 20 APR Time 1200 1030 1305 1405 1535 Temp (C) 6.3 7.2 6.2 7.3 9.5 pH 5.5 5.6 5.7 5.4 5.2 DO (mg/i) 12.0 12.0 12.5 11.8 11.6 Conductivity (umho/cm) 133 55 131 76 127 Width (m) 4.27 2.83 5.03 15.24 4.57 Avg. depth (m) 0.38 0.43 0.49 1.05 0.65 Flow (m3/sec) 0.27 0.30 0.52 9.66 0.42 Alkalinity (mg CaC0 /1) 29.0 10.3 11.4 6.2 5.2 Dissolved A1 (mg/i) 0.5 0.3 0.6 0.8 0.3 N03-N (mg/l) 2.4 1.0 2.8 1.1 6.0 SO4 (mg/l) 12 12 13 17 11 3-15 TABLE 10 WATER QUALITY AND STREAMFLOW DATA FOR 23 MARYLAND COASTAL ZONE STREAMS DURItrG THE WEEK OF 24-30 APRIL 1983 Stream Name (and Site Number)_ Mattawoman Creek Plum Nanjemoy Unnamed Wheatley Point Lyons Magothy Creek Tributary Run Creek Creek River Parameter (1) (3)(4) (5) (6) Date 30 APR 30 APR 30 APR 30 APR 30 APR 29 APR Time 1015 0900 1115 1230 1320 1340 Temp (C) 18.2 14.4 16.4 18.4 17.4 19.4 pH 6.4 6.4 6.5 6.8 6.6 6.7 DO (mg/1) 5.5 10.3 10.3 11.9 10.0 9.9 Conductivi ty (pmho/cm) 52 64 68 136 153 143 Width (m) 9.44 3.35 2.66 3.66 5.03 3.96 Avg. degth (m) 0.65 0.15 0.12 0.28 0.48 0.16 Flow (m /sec) 0.25 0.07 0.19 0.34 1.29 0.16 Alkali nity (mg CaCO /l) 6.6 11.0 7.7 23.0 10.0 14.2 Dissolved Al (mg/l) 0.50 0.25 0.68 0.32 0.18 0.87 NO -N (mg/l) 0.12 0.55 0.41 0.11 1.1 0.95 so4 (mg/i) 8 10 10 17 26 18 Stream Name (and Site Number) Severn North Muddy Stocketts Broad Deer Run River Creek Run Run Creek Parameter (7) L (9 (10) (11) 412) Date 29 APR 29 APR 29 APR 29 APR 29 APR 29 APR Time 1415 1530 1700 1615 0800 0955 Temp (C) 17.3 21.0 20.5 17.0 12.5 14.6 pH 7.0 6.8 6.6 7.0 6.5 6.6 DO (mg/l) 9.2 10.6 10.7 9.9 11.1 10,8 Conductivity (umho/cm) 107 75 124 117 119 111 Width (m) 6.10 4.72 3.20 4.57 3.87 39.93 Avg. depth (m) 0.76 0.30 0.13 0.23 0.26 0.21 Flow (ms/sec) 0.92 0.39 0.06 0.50 0,16 7.25 Alkalinity (mg CaCO /1) 10,0 5.5 4.4 9.0 28.5 17.5 Dissolved Al (mg/l) 0.55 0.14 0.32 0.21 0.31 0.13 N03-N (mg/l) 0,93 0.19 0.66 0.88 1.3 3.0 SO4 (mg/l) 15 14 27 23 7 8 Note: N DT - Not determined because stream is tidal. 3-16 TABLE 10 (CONT.) Stream Name (and Site Number) Great Church Winters Bohemia Long Stony Cypress Creek Run Creek Branch Run Branch Parameter (13) ([14) (15) (16) (17) (18) Date 29 APR 29 APR 1 MAY 1 MAY 1 MAY 1 MAY Time 1030 1130 0925 0900 0815 1040 Temp (C) 18.2 16.5 19.4 17.1 15.3 19.5 pH 6.7 6.9 6.5 6.4 6.5 6.3 DO (mg/1) 8.4 11.0 9.3 8.2 10.0 7.3 Conductivity (wmho/cm) 138 117 169 125 85 9.6 Width (m) NDT 22.40 4.88 NDT 7.31 13.72 Avg. depth (m) NDT 0.74 0.19 NDT 0.16 0.43 Flow (m3/sec) NDT 4.02 0.26 NDT 0.32 1.48 Alkalinity (mg CaCO /1) 1.1 19.0 29.6 14.2 13.1 12.0 Dissolved al (mg/i) 0.70 0.23 0.25 0.30 0.19 0.58 NO -N (mg/1) 0.62 2.0 2.9 1.8 0.86 1.3 so4 (mg/l) 11 9 18 14 4 10 Stream Name (and Site Number) Granny Morgan Herring Finley Choptank Tull Creek Branch Branch River Branch Parameter (19) (20) (21) (22) (23) Date 1 MAY 1 MAY 1 MAY 1 MAY 1 MAY Time 1140 1010 1300 1410 1520 Temp (C) 18.4 20.2 18.7 20.3 18.6 pH 6.4 6.3 6.6 6.4 6.6 DO (mg/l) 7.6 8.3 9.4 8.1 8.9 Conductivity (pmho/cm) 140 9.5 159 112 151 Width (m) 4.30 2.74 4.88 15.24 4.30 Avg. delth (m) 0.37 0.36 0.43 0.74 0.47 Flow (m3/sec) 0.22 0.15 0.29 5.88 0.20 Alkalinity (mg CaCO /1) 3.40 29.6 29.6 12.0 12.0 Dissolved A1 (mg/i) 0.34 0.55 0.28 0.62 0.20 NO3-N (mg/1) 2.1 1.3 3.3 1.1 6.6 so 4 (mg/i) 7 10 10 16 9 3-17 TABLE 11 WATER QUALITY AND STREAMFLOW DATA FOR BROAD RUN, CHURCH CREEK, AND DEER CREEK, 7 MARCH 1983 Stream Name (and Site Number) Broad Church Deer Run Creek Creek Parameter (11) (12) (13) Time 0835 1240 1050 Temp (C) 8.7 9.8 9.4 pH 6.5 7.1 7.1 DO (mg/1) 11.2 11.6 12.0 Conductivity (Umho/cm) 125 191 127 Width (m) 4.27 NDT 28.96 Avg. death (m) 0.20 NDT 0.39 Flow (m3/sec) 0.13 NDT 6.01 Alkalinity (mg CaCO /1) 26.2 26.5 30.2 Dissolved Al (mg/,) 0.8 0.28 0.16 NO -N (mg/l) 1.02 0.30 2.4 so4 (mg/1) 10 12 8 Note: NDT - not determined because stream is tidal. 3-18 TABLE 12 WATER QUALITY AND STREAMFLOW DATA FOR BROAD RUN, CHURCH CREEK, AND DEER CREEK, 18 MARCH 1983 Stream Name (and Site Number) Broad Church Deer Run Creek Creek Parameter (11) (12) (13) Time 1255 1530 1408 Temp (C) 8.0 8.2 7,6 pH 6.7 6.6 6.8 DO (mg/1) 12.1 11.9 12.2 Conductivity (umho/cm) 117 303 126 Width (m) 3.56 NDT 39.92 Avg. depth (m) 0.31 NDT 0.12 Flow (m /sec) 0.22 NDT 1.93 Alkalinity (mg CaCO /1) 25.6 33.1 24.4 Dissolved A1 (mg/l) 0.29 0.19 0.07 N03-N (mg/l) 1.26 0.28 2.8 SO4 (mg/l) 8 24 8 Note: NDT - Not determined because stream is tidal. 3-19 TABLE 13 WATER QUALITY AND STREAMFLOW DATA FOR BROAD RUN, CHURCH CREEK, AND DEER CREEK, 21 MARCH 1983 Stream Name (and Site Number) Broad Church Deer Run Creek Creek Parameter (11) (12) (13) Time 0800 1330 1130 Temp (C) 9.9 10.0 10.5 pH 6.2 6.5 6.4 DO (mg/1) 9.7 11.3 10.6 Conductivity (Pmho/cm) 78 49 109 Width (m) 5.18 NDT 39.92 Avg. depth (m) 0.47 NDT 0.46 Flow (m3/sec) 1.40 NDT 27.82 Alkalinity (mg CaCO /1) 14.5 12.4 16.6 Dissolved Al (mg/') 1.3 1.1 3.4 NO -N (mg/1) 0.48 0.74 2.1 s0o4 (mg/l) 10 10 10 Note: NDT - Not determined because stream is tidal. 3-20