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To 2 <br /> ANALYTICAL RESULTS: GROUNDWATER <br /> SHELL_SERVICE STATION,6131 PACIFIC AVENUE,STOCKrON,CALIFORNIA <br /> (All hydrocarbon results in parts-per-bilPion) <br /> Total Aromatic Volatile Organics <br /> Monitoring Date Petroleum Total Total Fecal <br /> Well Collected Hydrocarbons Lead Coliform Coliform <br /> Gasoline (MPN/100ml) (MPN/100ml) <br /> Benzene Toluene Ethyl- Total <br /> benzene Xylenes <br /> MW-1 07/23/90 350 1 9 1 5 0 6 20 --- 5 <<2 <br /> 10/09/90 < 0 8 < < < 5 13 <<2 <br /> 01/10/90 70 0 9 < < < --- 136 Neg <br /> 04/09/91 < < < < < -- «10 «10 <br /> 07/17/91 130 10 < < < --- 23 23 <br /> 10/08/91 160* 1 6 < < < --- 92 9.2 <br /> 02/26/92** 430 8 3 26 0 6 14 --- <<2 <<2 <br /> 05112/92** 90 5 0 < < 06 --- 70 <<3 8 <br /> 07/08/92** 53 59 052 < 089 --- <<3 8 <<3 8 <br /> 10/15/92 76 5 6 068 < < --- <<3 8 <<3 8 <br /> MW-2 07/23/90 1,900 440 420 71 21 0 --- 33 <<2 <br /> 10/09/90 570 780 430 < 270 «0 002 21 <<2 <br /> 01/10/90 1,200 3600 750 < 530 -- <<2 2 Neg. <br /> 04/09/91 4,500 1,200 0 1000 12 0 2100 — 1 1 1 1 <br /> 07/17/91 7,200 3,6000 4400 1400 710.0 -- >23 >23 <br /> 10/08/91 10,000 7,6000 3500 2600 6000 --- 120 120 <br /> 02/26/92** 17,000 7,4000 2200 3200 1,3000 — <<2 <<2 <br /> 05/12/92** 71 260 < 0 85 24 — «1 <<3 8 <br /> 07/08/92** 4,900 1,6000 < 600 2100 — <<3 8 <<3 8 <br /> 10/15/92 2,500 94 30 42 94 --- <<3 8 <<3 8 <br /> NOTES = Not analyzed <br /> < = Less than Practical Quantitation Reporting limits stated In the August 10 1990, "Tri-Regional Board <br /> Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Saes"(50 ppb for TPH, <br /> 0 5 ppb for BTEX) <br /> MPN/100m1 = Most Probable Number(MPN)of bacteria per one hundred milliliters <br /> << = Less than the indicated detection limit <br /> = Greater than or equal to <br /> * = Positive responsefor petroleum hydrocarbons,as gasoline,Is due to the presence of an unknown hydrocarbon,not gasoline <br /> Data collected by Emcon Associatesof Sacramento,California <br /> D = Duplicate sample <br /> Aegis Environmental Inc <br /> 90-020/Deccmher 15 1992 <br />