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3i 0308 Tabic 1 Summary of Results of Ground Water Sampling Chevron Service Station # 9-4275 2905 West Benjamin Holt Drive, Stockton, California Concentrations in parts Pei billion (Ppb ) WELL DATE OF TOP OF DEPTH GROUND TPH-G TOG 8 1 1 X 112 1,2 1,3 1.4 F113 ICE LOS ID SAMPLING/ CASING TO WATER DCA DEB DCB DCB MONITORING ELEVATION WATER ELEVATION RINSATE 07/03/90 NA NA NA NNSO NO(O 5 NO(O 5 NON 5 NNO 5 --- --- PACE RINSATE 10/19/90 NA NA NA NX50 --- ND(O 5 NNO 5 ND(O 5 ND(O 5 PACE RINSATE 01117/91 NA MA NA ND(50 NDO 5 ND(O 5 NNO S ND(O 5 --- -- SAL RINSATE 03/19/91 NA NA NA ND(50 NO(O 5 ND(O 5 NOW 5 NOW 5 --- NDO 5 00 5 NNO 5 --- SAL RINSATE 07118/91 NA NA NA ND(50 ND(O 5 ND(O 5 ND(O 5 NO(O 5 --- -- --- --- --- SAL RINSATE 10/31/91 NA NA NA NNSO --- NDQ 5 NNO 5 NOO 5 NNO S --- SAL R105ATE 01/16/92 NA NA MA MOOD --- ND(c 5 N9(0 5 NOW 5 00 5 --- SAL -------------------------------- -- ----------------------------------------------- - - EXPLANATION OF ABBREVIATIONS TPH-G Total Pet) oieum Hydrocarbons as Gasoline F113 Freon 113 (EPA method 8015 modified ) TCE Trichloroethylene TOG Total Oil and Grease ( EPA method 503D & 503E ) --- Not Analyzed/Not Measured E3 Benzene (EPA method 8020 or 8240 ) D Duplicate T Toluene (EPA methud 80210 of 8240 ) NA Not Applicable/Not Available E Ethylbenzene (EPA method 8020 of 8240) ND Not Detected X Xylenes (EPA method ts020 or 8240 ) TB. Trip Blank 1 ,2-DCA 1 , 2-Dichloroethan, SAL Supeilo) Analyticdl Lab> 1 ,2-DCB 1 , 2-Dichlorobenzene CCAS Central Coast Analytical Service 1 ,3-DCB 1 , 2-Dichlorobenzene PACE PACE Analytical Laboratoiy 1 4-DCB 1 , 2-Dichlorobenzene Does riot match typical gasoline pattern Note Top of casing and ground water elevations ate expressed as feet above mean sea level ( NCVD 1929) --------------- ------------- ----------------------------------------------------------------I------- -------------- ----- 05-Feb-92 Page 4