2009-08-10_GENERAL DOCUMENTS - M1977300 (2)

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TABLE 11-7. WATER QUALITY IN RALSTON CREEK 1998 - Jan 2009 STATION SW-PL C • W PL SW-PL SW-PL SW-PL SW-PL SW-PL SW-PL SW-PL SW-PL SW-PL MIN MAX MEAN MEDIAN COUNT NO % ND SW-PL 1 S 1/24/98 1 2/16/98 1/18/99 2/16/99 3/16/99 4/20/99 5/18/99 6/15/99 7/21/99 9/14/99 10/20/98 7 7 7 6 4 1 8 7.4 8.1 7.76 7.75 10 0 0% H (std units) 7.9 8.1 7.6 7.4 8.1 . 7.8 . . 322 339 10 0 0% p 348 196 501 330 441 396 282 143 152 426 0% Conductivity (umhos) 370 212 274 272 182 123 123 272 216.1 213 10 0 Total dissolved solids 214 119 5 1 55 9 16 7 17 3 F 10.8 3 10 1 10% Total sus ended solids 3 <1. 1 3 1 . . . 140 135 4 0 0% Hardness, total 120 180 150 110 0 0 Carbonate 0 0 Bicarbonate 58 92 59 100 58 100 77 75.5 4 0 0 Alkalinity, Dissolved 58 92 58 120 90 94 8 0 0% Alkalinity, total 97 120 100 82 96 76 5 0 <0 1 <0 5 0.8 <0.1 2.9 0.9 0.65 10 2 20% Nitrate Nitrogen 0.4 2.9 1.7 0.4 0.8 . 0.8 . 1 <1 . <1 0 <1. 0.15 0 10 10 100% Ammonia, total 0 0 0 0 0 0 0 < . 14 . . 5 32 34 14 40 30.2 31.75 8 0 0% Calcium 29 40 34 27 31 3 9 . 36 7 34.1 9.3 55 31.9 31.1 8 0 0% Sodium, dissolved 28 55 45 25 22 . 4 4 . 14 2 15.2 4.4 20 12.7 12.6 8 0 0% Magnesium, dissolved 11 20 16 10 11 . 1 1 . 2 4 2.3 1.1 2.9 2 2.35 8 0 0% Potassium, dissolved 2.3 2.9 2.5 1.9 2.4 . 18 9 9 . 93 9.9 170 80.9 80.5 10 0 0% Sulfate 65 170 140 70 96 91 56 . 4 0 0.6 0.5 0.5 5 0 0% Fluoride, total 0.4 0.6 0.6 0.4 0.5 17 10 11 15 . 10 21 14.6 15 1 0 0 0% Chloride 21 15 15 11 15 16 0 0 Phosphorous 0 2 0.2 <0.5 0.24 0.25 5 4 80 Aluminum, dissolved <0.5 <0.5 <0.5 <0.5 0 0 Aluminum, total 003 0 0 005 006 <0 <0.006 <0.006 <0.003 <0.03 0.0051 0.0035 8 6 75% Antimony, dissolved <0.03 <0.008 0.006 < . . . 0 0 Antimony, total <0 005 <0.005 <0.005 <0.003 <0.05 0.0068 0.0025 5 5 100% Arsenic, dissolved <0.05 <0.003 . <0.003 <0.003 0.0015 0.0015 3 3 100% Arsenic, total <0.003 <0.003 <0.003 <0 1 <0.1 <0.1 0.03 <0.1 0.042 0.05 5 3 60% Barium, dissolved 0.03 0.03 . 03 0 0.03 0.03 0.03 3 0 0% Barium, total 0.03 0.03 0.03 <0 001 001 <0 <0.001 . <0.001 <0.002 0.0008 0.00075 8 8 100 Beryllium, dissolved <0.001 <0.002 <0.002 <0.002 <0.002 . <0 05 . 08 0 06 0 <0.05 <0.08 0.0550 0.06 3 1 33% 60ron, total dissolved dmium C <0.002 <0.0002 <0.0002 <0.0002 <0.001 . <0.001 . . <0.0002 <0.002 0.000 0.0003 0025 0 6 6 6 6 100% 100% , a Chromium, dissolved <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 <0.005 0.003 . 0 0 Chromium, total <0.01 <0.01 <O.Ot 0.0050 0.005 1 1 100% Cyanide, total 0 0 Copper 02 <0 <0 02 <0.005 <0.005 <0.005 <0.005 <0.02 0.01 0.01 7 7 100% Copper, dissolved <0.02 <0.02 . . 0 0 Copper, total 0 1 <0 1 <0.03 0.1 0.039 0.0275 6 4 67 Iron, dissolved 0.04 <0.03 <0.03 <0.03 . . 0 0 Iron, total 0 0 Iron, suspended 0 0 Iron, Ferrous (Fe2+) 0 0 Iron, Ferric (Fe3+ 005 <0 005 <0 005 <0 002 <0.05 0.0067 0.0025 5 5 100% Lead, dissolved <0.05 <0.002 <0. . . . 002 <0 <0.002 0.0010 0.001 3 3 100% Lead, total <0.002 <0.002 <0.002 . <0 01 <0 01 005 0 0.005 5 5 100% Manganese, dissolved <0.01 <0.01 <0.01 <0.01 <0.01 . . . 0 0 Manganese, total <0 0002 0.0003 0.0002 0.0001 5 3 60 Mercury, dissolved <0.0002 0.0002 <0.0002 <0.0002 0.0003 . 0 0 Mercury, total 0 09 19 0 0.015 0.114 0.119 0.015 0.35 0.150 0.1165 8 0 0% Molybdenum, dissolved 0.108 0.35 0.21 . . <0 01 01 <0 <0.ol <0.01 <0.04 0.0131 0.0150 8 8 100% Nickel, dissolved <0.02 <0.04 <0.04 <0.04 <0.04 . <0 01 . <0 01 <0.01 <0.005 <0.05 0.0063 0.0038 8 8 100% Selenium, dissolved <0.05 <0.0o5 <0.005 <0.005 <0.005 . . 0002 <0 01 <0 0.0014 0.0003 6 6 100% Silver, dissolved <0.005 <0.001 <0.0002 <0.0002 <0.0002 <0.01 . . 0 0 Silver, total 05 <0 <0 001 <0 001 001 <0 <0.001 <0.001 <0.001 <0.001 <0.001 <0.05 0.0036 0.0005 8 8 100% Thallium, dissolved Vanadium, dissolved . <0.005 . <0.01 . <0.01 . <0.01 <0.01 <0.01 <0.005 <0.01 0.0046 0.005 6 0 6 0 100% Thallium, total <0 01 <0 01 <0.01 < 0.005 <0.01 0.004 0.0025 7 7 100% Zinc, dissolved <0.005 <0.005 <0.005 <0.005 . . 0 0 Zinc, total 0 0014 0014 0 0036 0 0014 0 0.0039 0.003 0.00315 1 0 0 0 Uranium, dissolved 0.0039 0.0035 0.0032 0.0031 0.0038 0.0029 0.0021 . . . . 0 0 Uranium, suspended 0 0 Uranium, total 0 1 0 0.1 0.05 0.05 2 1 50% Thorium-228, dis. (Ci/L) 0 . 0 0 1 0.05 0.05 2 1 50% Thorium-230, dis. (pCi(L) 0 0.1 0 . 0 0 0 2 2 100% Thorium-232, dis. (pCi/L) 0 0 1 0 0 2 0.1 0.6 0.3 0.2 5 6 0 0% Radium-226, dis. (pCi/L) 0.2 0.4 0.6 0.3 . . 0 0 Radium-226, sus p. (Ci/L 0 0 Radium-226, total (pCi/L) 1 1 2.2 1.1 1 9 6.08 2. 4 5 0 0 Gross Alpha, dis. (pCVL) 2.4 5.7 19 . <5 2 4 6 3.4 2. 5 5 2 40 Gross Beta, dis. Ci/L 2.4 3.6 6 <5. . . NOTES: mean ana median suausuc ca?cmu.cu u?,,,y...??•_??•?••••-•••••••••.-- ND = number of non-detects ND, %ND =number and percent of non detects Results are in mg/L unless otherwise noted • Page 12 of 30 WhetstoneAssoclates