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1 Iferman&Heir s Manna - Fourth Quarter 1999 Groundwater Momtormg February t 2000 Page -3- The purging and sampling sequence for the monitor wells was MW-1, MW-4, MW-3 and MW--2 1`ach well was purged with a new, disposable, polyethylene bailer until three well-casing volumes of water had been ' removed and the electrical conductivity, pH, and temperature of the water had stabilized The purge water was discharged to 55-gallon drums and left on site to await disposal Groundwater Monitoring Field Forms are included in Appendix C ' A groundwater sample was collected from each well by tilling a new, disposable, polyethylene bailer with groundwater and transferring the groundwater to two 40-milliliter glass vials fitted with Teflon®-lined caps The vials were checked to assure that no air bubbles were present Each sample container was labeled and placed in a cooler chilled with ice and delivered under chain-Of=custody procedures to GeoAnalytical Laboratories, Inc , in Modesto California, within 24 hours of sample collection Results of the laboratory analyses are discussed in Section 3 3 3.2 LABORATORY ANALYTICAL METHODOLOGY The analytical methods and detection limits for the laboratory analyses of the water samples collected during the December 22, 1999, groundwater monitoring event are summarized in Table 1 TABLE I Laboratory Analytical Methods Analytes BTEX TPH-G Gasoline Oxygenates/Additives Analytical Method 602 5030/1,UFT 8260 Detection Limit 0 3 rig/L (BTE) 0 05 mg/L 1 0 }Lg/L 0 6 µg/L (X) 10 0 p.g/L (tert Butanol) BTEX=benzene toluene ethyl benzene and total xylenes TPH-G=total petroleum hydrocarbons quantified as gasoline Ciasoline Oxygenates/Additives=methyl tertiary butyl ether(MTBE),ethanol tertiary-butanol di-isopropyl ether(DIPE) ethyl tertiary-butyl ether(ETBE)and tertiary amyl methyl ether(TAME) 3 3 LABORATORY ANALYTICAL RESULTS None of the analytes of interest were detected at or above the laboratory reported detection limits in the groundwater sample collected from MW-1 Toluene and MTBE were detected in the groundwater sample collected from MW-2 at concentrations of 15, and 100,000 micrograms per liter(µg/I), respectively TPH-G was detected in the groundwater sample collected from MW-2 at a concentration of 0 3 milligrams per liter (mg/1) Benzene, total xylenes, MTBE, and TPH-G were detected in the groundwater sample collected from MW-3 at concentrations of 18 µg/1, 5 1 µg/1, 10,000 µg/l, and 0 09 mg/l, respectively The laboratory reported detection limits associated with BTEX constituents and the gasoline oxygenates/additives were raised for the samples collected from MW-2 and MW-3 Benzene, total xylenes, and TPH-G were detected in the groundwater sample collected from MW-4 at concentrations of 3 0 µg/l, 26 µg11, and 0 1 mg/l, respectively The laboratory analytical results of the groundwater samples are presented in Table 2 on the next page and in Figure 3, Appendix A Historical groundwater monitoring data are included in Table 3, in Section 3 4 L� CONDOR