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• ANALYTICAL RESU2GROUNDWATER 4445 PERSHING AVENUE STOCKTON CALIFORNIA (Results m parts-per-rndhon/parts-per-billion) Monitoring Date Total Aromatic Volatile Organics EDB Total Organic Coliform Well Petroleum (ppb) Lead Lead Total/Fecal Hydrocarbons (ppm) (ppm) (MPN/100ml) Gasoline Benzene Toluene Ethyl- Total (ppm) (ppb) (ppb) benzene Xylenes (ppb) (ppb) I MW-1 07/23/90 < < < < < «0 01 <<1 0 — --- 10/09/90 < < < < < «0 01 --- <<1 0 --- — 01/09/91 < < < < < «0 01 --- --- -- >16 04/09/91 < < < < < «0 01 --- <<1 0 --- -- 07/17/91 < < < < < «0 01 0 005 -- -- --- 10/08/91 < < < < < «0 01 <<1 0 01/21/92 < < < < < «0 01 0 030 — --- -- 04/21/92 < < < < < «0 02 --- --- - --- 07/13/92 < < < < < - 10/08/92 < < < < < --- --- --01/01/11/93 11/93 < < < < < --- --- --- --- --- MW-1D 01/11/93 < < < < < _-- _-- --- --- --- ("MW-5") MW-2 07/23/90 < < < < < <<O 01 --- <<1 0 --- 10/09/90 < < < < < «0 01 --- «1 0 --- --- 01/09/91 < < < < < <<O 01 --- --- --- 16 04/09/91 < < < < < «0 01 --- <<1 0 6 9 6 9 07/17/91 0 060 < < < < «0 01 <<1 0 --- >23 >23 10/08/91 0 060 < < < < «0 01 0 005 --- 6 9 69 01/21/92 < < < < < «0 01 0 01 1 --- --- <38 04/21/92 < < < < < «0 02 --- --- --- 19 07/13/92 < < < < < --- --- --- --- <38 10/08/92 < < < < < --- --- --- --- <<2 0 /93 < < < < < --- --- --- --- 50 NOTES EDS = Ethylene dibromide = Below Practical Quantitation Reporting Limits per "Tri Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of Underground Tank Sites"(August 10, 1990) (PQL for BTEX=0 0005 ppm TPH,as gasoline and diesel= 0 05 ppm) MPN/100 ml = Mostprobable number per 100 milliliters of sample = Not analyzed << = Less than indicated detection limit/mpn as indicated on laboratory analytical report D = Duplicate sample Aegis Environmental fnc 89 016/March 23 1993