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i TABLE .�. �■� ■ttllll■ ANALYTICAL RESULTS: OUNDWATER SHELL SERVICE STATION,6131 PACIFIC AVENUE,STOCKTON CALIFORNIA (AD results in parts-per-billion, except as indicated) Total Aromatic Volatile Organics Monitoring Date Petroleum Total Total Fecal Well Collected Hydrocarbons Lead Coliform Coliform (MPN/100ml) (MPN/100ml) Gasoline Benzene Toluene Ethyl- Total (ppm) benzene Xylenes MW-1 07/23/90 035 1 9 1 5 0 6 2 0 --- 5 <<2 10/09/90 < 0 8 < < < 5 13 <<2 01/10/90 0 070 0.9 < < < --- 136 Nag 04/09/91 < < < < < --- «10 «10 07/17/91 013 10 < < < -- 23 23 10/08/91 0 16* 1 6 < < < --- 92 92 02/26/92 043 83 26 0 6 1 4 -- <<2 <<2 MW-2 07/23/90 1 9 440 420 71 21.0 --- 33 <<2 10/09/90 057 780 430 < 270 «0 002 21 <<2 01/10/90 1 2 3600 750 < 530 --- <<2 2 Neg 04/09/91 4 5 1,200 0 1000 12.0 2100 -- 1 1 1 1 07/17/91 72 3,6000 4400 1400 7100 — >23 >23 10/08/91 100 7,6000 3500 2600 6000 --- 120 120 02/26/92 170 7,4000 2200 3200 1,3000 --- <<2 <<2 MW-3 07/23/90 63 10,000.0 18,0000 118000 11,0000 -- 540 33 10/09/90 69 7,9000 12,0000 1,200 0 9,0000 «0 002 >2,400 920 01/10/90 63 10,0000 17,0000 1,200 0 7,200 0 --- 16 Pos 04/09/91 — --- — — — 07/17/91 --- --- -- _ --- __ 10/08/91 -- --- --- --- --- — -- 02/26/92 --- -- --- .-- — NOTES = Not analyzed < = Results are less than Practical Quantitation Reporting limits stated in the August 10, 1990, 'Tri-Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites"(50 ppb for TPH, 0 5 ppb for BTEX) MPN/100ml = Most Probable Number(MPN)of bacteria per one hundred milliliters << = Less than the Indicated detection limit > = Greater than or equal to " = Positive responsefor petroleum hydrocarbonsas gasoline is due to the presence of an unknown hydrocarbon,not gasoline MW 3 was not sampled due to the presence of floating liquid hydrocarbons Aegis Environmental Inc April 21 1992