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o 1 Water Level Data and Ground Water Analytic Results - Former Chevron Service Station #9-0959, 103 West 11th Street, Tracy, California (continued) D/ DTW GWE Product Analytic TPPH(G) B T E X Ft) Date (ft) (msl) Thickness' Method <------------------------------------ppb----------------------------------> 2/15/94 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 6/1/94 --- -- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 9/2/94 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 12/21/94 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 Blank 3/23/93 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 6/22/93 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 8/13/93 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 11/18/93 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 2/15/94 --- --- --- 8015/8020 <50 <0 5 <0 5 <0 5 <0 5 NATION NOTES DTW=Depth to water ' Product thickness was measured with an MMC Ilexi-dip interface TOC=Top of casing elevation probe GWE=Ground water elevation msl=Measurements referenced relative to mean sea level Top of casing elevations and analytic data prior to March 23, 1993 TPPH(G)=Total Purgeable Petroleum Hydrocarbons as Gasoline were compiled from the Environmental Assessment Report prepared B=Benzene for Chevron by Groundwater Technology,Inc January 7 1993 T=Toluene E=Ethylbenzene i Laboratory reports a hydrocarbon pattern not characteristic of X=Xylenes gasoline ppb=Parts per billion --=Not analyzed/Not applicable 2 Top of casing elevations resurveyed February 23 1994 by Ron Miller,P E #15816 TIC METHODS 3 Water level measurement only was collected due to apparent B015=EPA Method 8015/5030 for TPPH(G) obstruction in well 3020=EPA Method 8020 for BTEX Hydrocarbons in the gasoline range do not match the gasoline standard pattern(GTEL) NLG