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• W2 i ANALYTICAL RESULTS GROUNDWATER MOORE PETROLEUM INC. 14800 WEST FRONTAGE ROAD MANTECA, CALIFORNIA (All results in %4-parts-per-0IWon) Monitoring Date Total Petroleum Aromatic Volatile Organics Well Collected Hydrocarbons Gasoline Benzene Toluene Ethyl Total EDB EDC benzene Xylenes MW-1 08/22188+ < < < < < «0 1 36 05/11189+ < 21 < < 50 «0 2 «0 2 01/08/90+ 1,000 03 19 < < «01 «01 06/28190+ 110 08 130 0 4 63 «01 6 5 01/31/91 120* 09 06 < < «01 220 04/23/91 440* 110 < < 05 «0 1 350 07/22/91 < < < < < «0 5 140 10121/91 220 25 < < 0 5 --- 11/21/91 130 13 < < 0 7 — - 01/31/92 390** 49 < < 12 — 04/20/92 < < < < < — — 07/28/92 140 6 0 3 0 0 5 3 0 — - 10/20/92 600 94 < < < — MW-2 08122188+ 200 < < < 4 0 «01 0 4 05/11/89+ 100 17 7 0 < 5 0 «0 2 «0 2 01108/90+ 290 12 < < 0 5 «0 1 58 06/28/90+ 370 1 1 08 < 31 «01 «01 01/31/91 450* 1 2 0 5 < 06 «01 3 4 04/23/91 340* 09 < < 0 7 «0 1 «01 07/22/91 210 < 05 < 12 «0 5 14 10/21/91 150 < < < 2 4 11/21/91 140 1 5 < < 0 6 — 01/31/92 730** < < < < — — 04/20/92 < < < < < - — 07/28/92 180 < < < 0 6 - — 10/20/92 360 3 9 < < < NOTES EDS = Ethylene dibromide EOC 1 2 dichloroethane + Groundwater analytical results reprinted from previous consultant's reports < = Below Practical Quantitation Reporting Limas per 'Tri Regional Board staff Recommendations for Preliminary Evaluation and investigation of Underground Tank Sites (August 10 1990) (PQL for BTEX -0 S 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