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2 JULY 2001 GROUNDWATER MONITORING <br /> PSC's groundwater monitoring procedures and findings are contained in this section <br />' 2.1 Groundwater Monitoring Procedures <br />' A geologist from Kleinfelder (PSC's subcontractor), of Sacramento, <br /> California, performed groundwater monitoring on July 18 and 19, 2001 <br /> Groundwater samples were collected from monitoring wells MW-1, MW-4, <br />' MW-9, MW-10, MW-12, MW-13, SP-1, SP-2,PZ-1 and PZ-2 as directed by <br /> Ms Carol Oz with the PHS/EHD <br />' Prior to sample collection, KleinfeIder's geologist measured groundwater <br /> levels in these wells, and the potential presence of free phase gasoline product <br /> with an electronic oil/water interface probe Free phase gasoline product has <br />' never been observed in any well <br /> Kleinfelder's geologist purged a minimum of three well volumes of <br /> groundwater from each well into 55-gallon drums using a downhole pump and <br /> clean, dedicated tubing Field parameters pH, temperature, and electrical <br /> conductivity were monitored for stability The 55-gallon drums were <br /> temporarily stored on-site, then removed and transported to PSC's licensed, <br /> California waste disposal facility <br /> Groundwater samples were collected with clean, disposable bailers, and <br /> transferred into clean laboratory-provided containers Sample containers were <br /> sealed, labeled, and stored in an iced chest for subsequent delivery to the <br /> analytical laboratory <br /> Samples were delivered, with chain-of-custody control, to Acculabs Inc in <br /> Davis California Samples were analyzed for benzene, toluene, ethylbenzene, <br /> xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPH-G) using <br /> EPA Method 602/8015(modified) These samples were also analyzed for <br /> 1 oxygenate compounds TBA, MTBE, DIPE, ETBE, and TAME using EPA <br /> Method 8260 <br /> s <br /> July 2001 <br /> Groundwater Monitoring and <br /> Remedial Action Results <br /> The Earthgrams Company <br /> 2651 South Airport Way <br /> Stockton,Callfornta <br /> Prepared for TI{E EARTrICRAINS COMPANY Prepared by Philip Services Corp <br /> H TNV162400132U21382EG1Sao kton55tockton10701mon dm August 14,2001 <br />