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I Groundwater Analytical Data <br /> Parkinson's Arco <br /> 3250 West Hammer Lane <br /> Stockton,California <br /> Top of <br /> Casing Depth to Groundwater TPH as Ethyl- <br /> Sample Date Elevation Water Elevation Gasoline Benzene Toluene benzene Xylenes MtBE DIPE ETBE TAME TBA <br /> Identification Sampled MSL feet b s MSL u A (ug/1) (ug/l (ug/l (ug/1) u A (ug/l (ug/l u A u /l <br /> MW-4 07/29/02 4.801'1 13.28 -8.48 <50 1.1 <0.3 <0.3 <0.6 14,000 40 8.8 160 <50 <br /> 10/07/02 14.12 -9.32 <50 <0.30 <0.30 430 460 9,600 40 40 110 140 <br /> 01/02/03 13.56 -8.76 <50 33 0.73 <0.30 1.1 14,000 40 40 <5.0 <50 <br /> 04/03/03 13.35 -8.55 <50 450 <0.50 <0.50 <1.0 12,000 <5.0 <5.0 200 <50 <br /> MW-5 07/29/02 5.131' 13.61 -8.48 <50 <0.3 0.9 <0.3 1.2 18,000 <25 <25 150 5,700 <br /> 10/07/02 14.40 -9.27 <50 <0.30 0.42 <0.30 <0.60 29,000 <250 <250 <250 5,600 <br /> 01/02/03 13.87 -8.74 <50 <0.30 0.38 <0.30 <0.60 41,000 <5.0 40 230 12,000 <br /> 04/03/03 13.61 -8.48 <50 <0.50 <0.50 <0.50 <1.0 29,000 <5.0 <5.0 370 540 <br /> U94Micrograms per liter DIPE Di-isopropyl ether ETRE Ethyl tert-butyl ether <br /> MSL Mean sea level TPH Total petroleum hydrocarbons TAME Tert-amyl methyl ether <br /> bgs Below ground surface MtBE Methyl tert-butyl ether TBA Tert-butyl alcohol <br /> t'I Well casing elevations surveyed by Morrow Surveying on 7/2/02. <br /> m Sample contained compounds in the gasoline range,but the chromatogram pattern was not consistent with the expected pattem. <br /> i <br /> Shaw Environmental,Inc. <br /> N:\rmtcfpl\Projects\Projects\880\040\lA\0107\2gtt03 4/24/2003 <br />