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1 <br /> GeoStrategies Inc. <br /> UNOCAL Corporation <br /> February 19, 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 102 gallons of purge water <br /> was collected and transported to Gibson Environmental TSD Recycling in <br /> Redwood City for disposal <br />► Ground-water samples were collected on January 13, 1993 <br /> Ground-water monitoring wells MW-1 , MW-2, MW-3, MW-4 and MW-5 <br /> were dry and therefore, not sampled Samples were analyzed for Total <br /> Petroleum Hydrocarbons calculated as Gasoline (TPH-Gasoline) according <br /> to EPA Method 8015 and for Benzene, Toluene, Ethylbenzene and Xylenes <br /> (BTEX) according the EPA Method 8020 These ground-water samples <br /> were analyzed by National Environmental Testing (NET) Pacific Inc , a <br /> California state certified laboratory located in Santa Rosa, California <br /> Groundwater samples were also analyzed for Total Coliform and Fecal <br /> Coliform The laboratory analytical reports and Chain-of-Custody forms are <br /> presented in Appendix B TPH-Gasoline and BTEX data are presented in <br /> Table 2 A chemical isoconcentration map for benzene is presented on <br /> Plate 4 Ground-water sampling field methods and procedures are <br /> included in a previous GSI report dated August 4, 1992. <br /> i 785580-4 <br />