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TABLE 11-7. WATER QUALITY IN RALSTON CREEK
<br />1998 - Mar 2010
<br />STATION SW-UP
<br />17_?
<br />•
<br /> SW-UP SW-UP SW-UP SW-UP SW-UP SW-UP SW-UP SW-UP SW-UP SW-UP SW-UP MIN MAX MEAN MEDIAN COUNT NO %ND
<br /> 11/24/98 10/21/98 12/21/98 1/19199 2/16/99 3/16/99 4/20/99 5118/99 6/14/99 7/21/99 9/14/99
<br />pH (std units) 8.0 7.8 7.5 7.4 7.7 7.7 7.7 7.1 7.4 7.8 7.1 8 7.6 7.7 10 0 0%
<br />Conductivity(umhos) 500 206 204 185 221 184 193 114 141 194 114 500 214 194 10 0 0%
<br />Total dissolved solids 400 127 138 80 131 135 133 101 115 131 80 400 149 131 10 0 0%
<br />Total suspended solids <t. 2 3 <1. 2 1 43 3 <10. 11.7 <1. 43 7.2 2.5 10 3 30%
<br />Hardness, total 81 84 82 73 73 84 80.0 81.5 4 0 0%
<br />Carbonate
<br />
<br />Bicarbonate 0
<br />
<br />0
<br />Alkalinity, Dissolved 55 39 51 74 39 74 55 53 4 0 0%
<br />Alkalinity, total 96 76 62 76 97 170 55 39 39 170 84 76 8 0 0%
<br />Nitrate Nitrogen <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.5 <0.5 <0.1 <0.5 0.09 0.05 10 10 100%
<br />Ammonia, total 0 0 0 0 0 0 0 <t. <t. <1. 0 1 0.2 0 10 3 30%
<br />Calcium 23 24 23 20 23 13.9 23 24.3 13.9 24.3 21.8 23 8 0 0%
<br />Sodium, dissolved 8 10 9 8 <5. 9.6 9.2 8.4 <5. 10 6.1 8.7 8 1 13%
<br />Magnesium, dissolved 5.8 62 5.8 5.4 2.5 4.5 6 6.4 2.5 6.4 5.3 5.8 8 0 0%
<br />Potassium, dissolved 1.3 1.7 1.4 1.3 0.7 1.1 1.5 1.4 0.7 1.7 1.30 1.35 8 0 0%
<br />Sulfate 14 28 21 15 21 15 17 8.2 7.4 9.1 7.4 28 16 15 10 0 0%
<br />Fluoride, total 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 0.3 5 0 0%
<br />Chloride 11 14 12 11 13 13 14 10 11 13 10 14 12.2 12.5 10 0 0%
<br />Phosphorous 0
<br />Aluminum, dissolved <0.5 <0.5 <0.5 <0.5 <0.1 <0.1 <0.5 0.21 0.25 5 5 100%
<br />Aluminum, total 0
<br />Antimony, dissolved <0.008 <0.03 <0.003 <0.003 <0.003 <0.006 <0.006 <0.006 <0.003 <0.03 0.004063 0.003 8 8 100%
<br />Antimony, total 0
<br />Arsenic, dissolved <0.003 <0.05 <0.005 <0.005 <0.005 <0.003 <0.05 0.00680 0.0025 5 5 100%
<br />Arsenic, total <0.003 <0.003 <0.003 <0.003 <0.003 0.0015 0.0015 3 3 100%
<br />Barium, dissolved 0.04 0.03 <0.1 <0.1 <0.1 0.03 <0.1 0.044 0.05 5 3 60%
<br />Barium, total 0.04 0.03 0.03 0.03 0.04 0.033333 0.03 3 0 0%
<br />Beryllium, dissolved <0.002 <0.001 <0.002 <0.002 <0.002 <0.001 <0.001 <0.001 <0.001 <0.002 0.00075 0.00075 8 8 100%
<br />Boron, total <0.05 <0.05 <0.05 <0.05 <0.05 0.025 0.025 3 3 100%
<br />Cadmium, dissolved <0.0002 <0.002 <0.0002 <0.001 <0.001 <0.001 <0.0002 <0.002 0.00045 0.0005 6 6 100%
<br />Chromium, dissolved <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 0.0025 0.0025 6 6 100%
<br />Chromium, total
<br />
<br />Cyanide, total
<br /><0.01
<br /><0.01
<br /><0.01
<br />0.0050
<br />0.005 0
<br />1
<br />1
<br />100%
<br />Capper
<br />
<br />Copper, dissolved
<br /><0.02
<br /><0.02
<br /><0.02
<br /><0.02
<br /><0.005
<br /><0.005 <0.005
<br /><0.005
<br /><0.02
<br />0.007
<br />0.01 0
<br />7
<br />7
<br />100%
<br />Copper, total
<br />
<br />Iron, dissolved
<br /><0.03
<br />0.06
<br /><0.03
<br /><0.03
<br /><0.1
<br />0.1
<br /><0.03
<br />0.1
<br />0.043
<br />0.0325 0
<br />6
<br />4
<br />67%
<br />Iron, total 0
<br />Iron, suspended
<br />0
<br />Iron, Ferrous (Fe2+) 0
<br />Iron, Ferric (Fe3+)
<br />0
<br />Lead, dissolved <0.002 <0.05 <0.005 <0.005 <0.005 <0.002 <0.05 0.0067 0.0025 5 5 100%
<br />Lead, total <0.002 <0.002 <0.002 <0.002 <0.002 0.00 0.001 3 3 100%
<br />Manganese, dissolved <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 0.005 0.005 5 5 100%
<br />Manganese, total 0
<br />Mercury, dissolved <0.0002 <0.0002 0.0003 <0.0002 <0.0002 <0.000 00.0003 0.0 0.0001 5 4 80%
<br />Mercury, total 0 0
<br />Molybdenum, dissolved <0.01 <0.005 <0.01 <0.01 <0.01 0.017 <0.005 <0.005 <0.005 0.017 0.01 0.005 8 7 88%
<br />Nickel, dissolved <0.04 <0.02 <0.04 <0.04 <0.04 <0.01 <0.01 <0.01 <0.01 <0.04 0.01 0.015 8 8 100%
<br />Selenium, dissolved <0.005 <0.05 <0.005 <0.005 <0.005 <0.01 <0.01 <0.01 <0.005 <0.05 0.00625 0.00375 8 8 100%
<br />Silver, dissolved <0.001 <0.005 0.0004 <0.0002 <0.0002 <0.01 <0.0002 <0.01 0.0014 0.00045 6 5 83%
<br />Silver, total
<br />
<br />Thallium, dissolved
<br /><0.001
<br /><0.05
<br /><0.001
<br /><0.001
<br /><0.001
<br /><0.001
<br /><0.001 <0.001
<br /><0.001
<br /><0.05
<br />0.004
<br />0.0005 0
<br />8
<br />8
<br />100%
<br />Vanadium, dissolved <0.01 <0.005 <0.01 <0.01 <0.01 <0.01 <0.005 <0.01 0.005 0.005 6 6 100%
<br />Thallium, total
<br />
<br />Zinc, dissolved
<br /><0.005
<br />0.006
<br /><0.005
<br /><0.005
<br /><0.01
<br /><0.01 <0.01
<br /><0.005
<br /><0.01
<br />0.004071
<br />0.005 0
<br />7
<br />6
<br />86%
<br />Zinc, total
<br />0
<br />Uranium, dissolved 0.0028 0.0024 0.0036 0.002 0.0024 0.0022 0.0013 0.0014 0.0011 0.0028 0.0011 0.0036 0.0022 0.0023 10 0 0%
<br />Uranium, suspended
<br />
<br />Uranium, total 0
<br />0
<br />Thoriurrr228, dis. (pCi/L) 0 0.1 0 0.1 0.050 0.05 2 1 50%
<br />Thorium-230, dis. (pCi/L) 0 0.1 0 0.1 0.05 0.05 2 1 50%
<br />Thorium-232, dis. (pCVL) 0 0 0 0 0.0000 0 2 2 100%
<br />Radium-226, dis. (pCi/L) 0.2 0.2 0.4 0 0 0 0.4 0.1600 0.2 5 2 40%
<br />Radiurrf226, susp. (pCi/L) 0
<br />Radiu-226, total (pCi/L) -
<br />
<br />Gross Alpha, dis. (pCVL)
<br />2.9
<br />1.8
<br />4.7
<br />1.4
<br />0.9
<br />0.9
<br />4.7
<br />2.34
<br />1.8 0
<br />5
<br />0
<br />0%
<br />Grass Beta, dis. (pCi/L) 0.9 1.2 0.8 <5. <5. 0.8 <5. 1.58 1.2 5 2 40%
<br />NOTES: Mean and median statistic calculated using one-half detection limit (1/2 D.L.)
<br />NO = number of non-detects NO, % No = number and percent of non detects
<br />Results are in mg/L unless otherwise noted
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<br />Page 1 of 31
<br />Whetstone Associates •
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