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GeoStrategies Inc. <br /> UNOCAL Corporation <br /> June 9, 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 The field data sheets <br /> are included in Appendix A Approximately 153 gallons of purge water <br /> was collected and transported to Gibson Environmental TSD Recycling in <br /> Redwood City for disposal <br /> Groundwater samples were collected on April 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 /> Beginning the second quarter of 1993, groundwater will not be analyzed <br /> for Total Coliform or Fecal Coliform The laboratory analytical reports and <br /> Chain-of-Custody forms are presented in Appendix B TPH-Gasoline and <br /> BTEX data are presented in Table 2 A chemical isoconcentration map <br /> . for benzene is presented on Plate 4 Groundwater sampling field methods <br /> and procedures are included in a previous GSI report dated August 4, <br /> 1992 <br /> 785580-5 <br />