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1 <br /> GeoStrategies Inc. <br /> UNOCAL Corporation <br />► September 23, 1993 <br /> Page 2 <br /> Each well was checked for the presence of floating product Floating <br />► product was not observed in the wells this quarter and has not been <br /> previously observed at this site The field data sheets are included in <br /> Appendix A <br /> Groundwater samples were collected on July 26, 1993 Samples were <br />► analyzed for Total Petroleum Hydrocarbons calculated as Gasoline <br /> (TPH-Gasoline) according to EPA Method 8015 (Modified), and for <br /> Benzene, Toluene, Ethylbenzene and Xylenes (BTEX) according the EPA <br /> Method 8020 These groundwater samples were analyzed by Anametrix <br /> Inc , a California state certified laboratory located in San Jose, California <br /> 1 The laboratory analytical report and Chain-of-Custody form are presented <br /> in Appendix B Current TPH-Gasoline and BTEX data are presented with <br /> historical chemical analytical data in Table 2 A chemical <br /> isoconcentration map for benzene is presented on Plate 4 Groundwater <br /> sampling field methods and procedures are included in a previous GSI <br /> IWell report dated August 4, 1992 <br /> I <br /> i <br /> I 785580-6 <br /> r <br />