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To 2 <br /> ANALYTICAL RESULTS: GROUNDWATER <br /> SHELL SERVICE STATION,6131 PACIFIC AVENUE,STOCKTON,CALIFORNIA <br /> (All results in parts-per-billion, accept as militated) <br /> Total Aromatic Volatile Organics <br /> Monitoring Date Petroleum Total Total Fecal <br /> Well Collected Hydrocarbons Lead Coliform Coliform <br /> (MPN/100ml) (MPN/100ml) <br /> Gasoline Benzene Toluene Ethyl- Total <br /> (ppm) benzene Xylenes <br /> MW-1 07/23/90 035 1 9 1 5 0 6 2 0 — 5 <<2 <br /> 10/09/90 < 0 8 < < < 5 13 <<2 <br /> 01/10/90 0 070 0 9 < < < --- 136 Neg <br /> 04/09/91 < < < < < --- «10 «1.0 <br /> 07/17/91 013 10 < < < --- 23 23 <br /> 10/08/91 0 16* 1 6 < < < -- 92 92 <br /> 02/26/92** 043 8 3 26 0 6 1 4 -- <<2 <<2 <br /> 05/12/92** 0 090 5 0 < < 06 -- 7.0 <<3 8 <br /> 07/08/92** 53 5 9 0 52 < 089 -- <<3 8 <<3 8 <br /> MW-2 07/23/90 1 9 440 420 7.1 21 0 --- 33 <<2 <br /> 10/09/90 057 78 0 430 < 270 «0 002 21 <<2 <br /> 01/10/90 1 2 3600 750 < 530 --- <<2 2 Neg <br /> 04/09/91 45 1,200 0 1000 120 2100 — 1 1 1.1 <br /> 07/17/91 72 3,6000 4400 1400 7100 --- >23 >23 <br /> 10/08/91 100 7,6000 3500 2600 6000 --- 12.0 120 <br /> 02/26/92 170 7,4000 2200 3200 1,3000 --- <<2 <<2 <br /> 05/12/92 0 071 260 < 085 2 4 -- «1 <<3 8 <br /> 07/08/92 4,900 1,6000 < 600 2100 --- <<3 8 <<3 8 <br /> MW-2D 07/08/92** 5,000 1,700 < 610 230 --- --- — <br /> NOTES = Not analyzed <br /> < = Results are 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 Sites'(50 ppb for TPH, <br /> 0 5 ppb for BTEX) <br /> MPN/100ml - 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 /> MW-3 was not sampled due io the presence of floating liquid hydrocarbons <br /> Aegis Enwronmental Inc <br /> 90 02010etober 14 1992 <br />