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i ,i&0 [brines Y} 41onnu m,,Rrixs[ Ilr—ml[r[ Il I'r•�l • Groundwater Elevation 1 he average depth to groundwater was approximately 30 G feet below the ground surface (bgs) at the site The groundwater elevation ranged Irom 20 42 to 18 43 feet beloxv mein sea level (bins]) Groundwater elevation contours are shown in Figure 3 Appendix A 3 QUARTERLY GROUNDWATER MONITORING - OCTOBER 1997 The work conducted during the, quarterly 4groundwatcr monitoring was in accordance with the. approved protocol lormerly established at the site The. %cope-of-work prc.%eiated in the report was approved by Mr Ronald Rove of the PHS/EHD IOn October 23, 1997, Condor personnel made field observations and collected groundwater samples from the seven monitor wells at the site (see Figure 2 Appendi♦ A for well locations) All field equipment was decontaminated in tlae field with a solution of laboratory-grade non-phosphate detergent and hydrocarbon-free water and rinsed -,N ith hydrocarbon-free water prior to use in each well All field instruments were calibrated to the manufacturer's recommended standards The \.iter level m each well N%as measured to the nearest 0 0l foot with a standard battcrN-operated flat-tape water-level meter A new, disposable polyeth}]ene bailer was lowered into each -,\ell to collect a field-nispcction %ample The bailer sample was inspected for floating product sheen discoloration and/or odor Floating product was not observed in any of the monitor wells during the groundwater sampling However, water levels in the wells were abo'�c the top of the well screens Petrolcaina odors were detected in MW-2 and MW-5 Each well was purged v all a dedicated bailer until at least three well-casing volumes of water were removed and until the plf specific conductance and temperature of the water had stabilized Groundwater Monitoring, Field Forms are included in Appendix 13 Prior to sampling the \s iter was allowed to recover to at least 80% of the pre-purge «alter level The purge water «as discharged to 55-gallon drums and left oil Site to await disposal For each well • A groundwater sample was collected with a disposable, one-time-use polyeth}lene bailer The sample was transferred to three (3) 40-m1 glass VOA vials fitted with Teflon-lined caps Each ial was inverted and tapped to assure that no air bubbles were present • Each vial was labeled and placed in a cooler chilled with ice and delivered und4r chain-of- custody procedures to GeoAnalytical Laboratories Inc in Modesto, California within 24 ' hours of sample collection The results of laboratory analyses are discussed in Section 4 2 ' 4 INVESTIGATION RESULTS 4 1 Laboratory, Analyses ' The groundwater samples were andly7ed for total petroleum hydrocarbons quantified as ga%ohne ( FPl I-G) by Method 5010/1,UFT and for benne IL, toluene, ethyl benzene and total xylene.% (BTEX) by LPA Method 602 ' �� CONDOR