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w w � www >'■ a, as T 2wwr wws ww � � <br /> ANALYTICAL RESULTS: GROUNDWATER <br /> SHELL SERVICE STATION,6131 PACIFIC AVENUE,STOCKTON,CALIFORNIA <br /> (All results in parts-per-billion, except as indicated) <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 < 08 < < < 5 13 <<2 <br /> 01/10/90 0 070 0 9 < < < --- 136 Neg <br /> 04/09/91 < < < < < «10 «10 <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 2 6 0 6 1 4 --- <<2 <<2 <br /> 05/12/92 0 090 5 0 < < 0 6 --- 7 0 <<3 8 <br /> MW-2 07/23/90 1.9 440 420 71 21 0 --- 33 <<2 <br /> 10/09/90 057 780 430 < 270 «0 002 21 <<2 <br /> 01/10/90 1 2 3600 750 < 530 — <<2 2 Neg <br /> 04/09/91 4.5 1,200 0 1000 12 0 2100 -- 1 1 1 1 <br /> 07/17/91 7 2 3,6000 4400 1400 7100 --- >23 >23 <br /> 10/08/91 100 7,6000 3500 2600 6000 — 12 0 12 0 <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 /> NOTES - - Not analyzed <br /> < _ Results are less than Practical Ouantltatlon 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 response for petroleum hydrocarbons as gasoline,is due to the presence of an unknown hydrocarbon not gasoline <br /> MW 3 was not sampled due to the presence of floating liquid hydrocarbons <br /> i <br /> Aegis Enwronmenlal Inc <br /> July 27 1992 <br />