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Herman&Helen ti Marina First Quarter 20W Groundw-iter Monitoring <br /> April 20 2OW <br /> Page 3 <br /> . The purging and sampling seclur,nce for the monitor wells was MW-I, MW-4, MW-3, and MW-2 Each well <br /> was purged with a new, disposable, polyethylene bailer until three well-casing volumes of water had been <br /> removed and the electrical conductivity, pH and temperature of the water had stabilized I he purge water was <br /> discharged to 55-gallon drums and left on stte to await disposal Groundwater Monitoring Field Forms are <br /> included in Appendix C <br /> A groundwater ,ample was collected trom each well by filling a ni,w disposable, polyethylene bailer with <br /> groundwater and transferring the groundwater to two 40-milliliter glass vials fitted with Feflon&hned caps The <br />' vials were LhCLked to assure that no air bubbles were present teach sample container was labeled and placed in a <br /> cooler chilled with ice and delivered under chain-ot-Lustody procedures to GeoAnalytical Laboratories Inc , in <br /> Modesto, California, within 24 hours of sample collection Results of the laboratory analyses are discussed in <br /> Section 3 3 <br /> 3 2 LABORATORY A_\'ALYTICAL METHODOLOGY <br /> rFhe analytical methods and deti,ction limits for the laboratory analyses of the water samples collected during the <br /> March 17, 2000, groundwater monitoring event are summarized in Fable I <br /> TABLE 1 <br /> Laboratory Analytical Methods <br /> F- Analytes <br /> • —_ — BTFX TPH_G Gasoline Oxygenates/Additives <br /> Analytical Method 602 5030I1,UFT 8260 <br /> Detection I imit 0 3 gg/t, (B IT) 0 05 mg/L 1 0 }igfl. <br /> (X) 10 0 lig/L (tert Butanol) <br /> mg/L milligrams per liter(parts per million) µg/L -micrograms pLr liter(parts per billion) <br /> BTEX -benzene toluene ethyl benzene. and total xylenes <br /> TPH-G=total petroleum hydrocarbons quantified as gasoline <br /> (,asoline Oxygenates/Additives methyl tertiary butyl ether(MTBE), ethanol tertiary-butanol <br /> di-:sopropyl ether(DiPF) ethyl tertiary-butyl ether(FTBF)and tertiary amyl methyl ether(TAME) <br />' 3 3 LABORATORY ANALYTICAL RESULTS <br /> None of the analytes of interest were detected at or above the laboratory reported detection limits in the <br /> groundwater sample collected from MW-1 Benzene and MTBE were detected in the groundwater sample <br /> collected from MW-2 at concentrations of 9 2 and 59,000 ltg/l, respectively The laboratory reported detection <br /> limits were raised for the sample collected from MW-2 Benzene and MTBE were detected in the groundwater <br /> sample collected from MW-3 at concentrations of 1 7 and 3,600 lig/l, respectively The laboratory reported <br /> detection limits associated with the gasoline oxygenates/additives were raised for the sample collected from <br /> MW-3 Benzene, ethyl benzene, total xylenes, and TPH-G were detected in the groundwater sample collected <br /> from MW-4 at concentrations of 3 2 pg/l, 0 46 µg/l, 58 lig/l and 0 30 mg/l, respectively The laboratory <br /> analytical results of the groundwater samples are presented in Table 2 on the next page and in Figure 3, <br /> Appendix A flistorical groundwater monitoring data are included in Table 3, in Section 3 4 <br /> • <br /> I <br /> L� CONDOR <br />