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• TO! � ANALYnCALRESULTS GROUNDWATER MOORE PETROLEUM INC 14800 WE57 FRONTAGE ROAD MANTECA.CALIFORNIA (AN results In gA,parts-per-billion) Monitoring Date Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons I Gasoline Benzene Toluene Ethyl- Total EDB EDC benzene Xylenes MW 1 08/22/88+ < < < < < «0 1 36 05/11/89+ < 21 < < 50 «0 2 «0 2 01/08/90+ 1,000 03 19 < < «01 «01 06/28/90+ 110 08 130 04 63 «0 1 65 01/31/91 120* 09 06 < < «0 1 220 04/23/91 440* 110 < < 05 «0 1 350 07/22/91 < < < < < «0 5 140 10/21/91 220 25 < < 05 -- 110/91 - 11/21/91 130 13 < < 07 -- 01/31/92 390** 49 < < 12 - 04/20/92 < < < < < _ 07/26/92 140 60 30 05 30 10/20/92 600 94 < < < _ 01/21/93 350 6 5 12 < 09 -- 04/08/93 230 21 < < < — 38 M W 2 08/22/86+ 200 < < < 40 «0 1 04 05/11/89+ 100 17 70 < 50 «0 2 <<02 01/08/90+ 290 12 < < 05 «0 1 58 06/28/90+ 370 1 1 08 < 31 «01 «01 01/31/91 450* 12 05 < 06 «01 34 04/23/91 340* 09 < < 07 «0 1 «0 1 07/22/91 210 < 05 < 12 «0 5 14 10/21/91 150 < < < 24 11/21/91 140 15 < < 06 01/31/92 730** < < < < -- 04/20/92 < < < < < 07/28/92 180 < < < 06 10/20/92 360 39 < < < - -_ 01/21/93 62 06 < < 05 04/08/93 < < < < < 33 NOTES EDB - Ethylene dibromide EDC - 12 dlchloroethane + - Groundwater analytical results reprinted from previous consultant's reports < - 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 5 ppb TPH as gasoline and diesel-50 ppb) « - Below Indicated detection limit Not analyzed Laboratory reports Indicate this is weathered gasoline Laboratory reports Indicate total petroleum hydrocarbons as gasoline result is due to a petroleum hydrocarbon that does not appear to be gasoline Aegis Environmental Inc 90-097/June 11 1993