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Beacon Station No.474 December 23, 1997 <br /> Stockton-California Additional Subsurface Investigation Repo <br /> Table 2 - Groundwater Data <br /> I <br /> GROUNDWATER LEVEL MEASUREMENTS LABORATORY ANALYTICAL DATA <br /> I <br /> Well No./ Sample Total Depth to Groundwater TPHg MTBE (8020)/ Benzene Toluene Ethyl- Xylenes <br /> Elev. Date Depth Water Elevation MTBE (82601) Benzene <br /> (feet) (feet) (feet) (feet) (ppb) (ppb) (ppb) (ppb) (ppb) (ppb) <br /> MW-6 10/01/97 76.71 65.47 -40.03 58,000 <1000/<0.50 16,000 7,900 1,000 7,100 <br /> 25.44 11/21197$ 53,000 <500/----- 19,000 5,500 970 5,900 <br /> MW-7 09/30/97 77.22 65.83 -40.17 <50 <5.0/<0.50 <0.50 <0.50 <0.50 <0.50 <br /> 25.66 11121/97$ <50 <0.50/---- <0.50 <0.50 <0.50 <0.50 <br /> MW-8 10/01/97 76.60 65.65 -39.97 79 <5.01<0.50 <0.50 <0.50 <0.50 <0.50 <br /> 25.68 11/21/97: 55 <0.50/---- <0.50 <0.50 <0.50 <0.50 <br /> i <br /> MW-9 10/01/97 76.55 66.68 -40.10 <50 <5.0/<0.50 <0.50 <0.50 <0.50 <0.50 <br /> 26.58 11/21/97T <50 <0.50/---- <0.50 <0.50 <0.50 <0.50 <br /> MTBE=methyl tertiary-butyl ether TPHg=Total Petroleum Hydrocarbons as gasoline ppb=parts per billion <br /> t =Analyzed for oxygenates:di-isopropyl ether(DIPE),ethyl-t-butyl ether(ETBE),tert-amyl methyl ether(TAME),tert-butanol,methanol,and ethanol by <br /> EPA Method 8260. All analytical results were below laboratory detection levels. See lab reports for detection limits(Appendix 1). <br /> $=Groundwater sampling on 11/21/97 conducted by Doulos Environmental. Field sampler did not have the new Horizon well numbers and labeled <br /> the wells as MW-IA(=MW-9),MW-2A(=MW-6),MW-3A(=MW-8),MW-5(=MW-5),and MW-7(-MW-7). <br /> i <br /> i <br /> 1474-12.rpt HORIZON ENVIRONMENTAL INC. <br />