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Herman& Helen ti Marina -Third Quarter 1999 Groundwater Moratonng October 26 1999 Page 3 A groundwater sampie was collected from each well by filling a new, disposable, polyethylene bailer with ' groundwater and transferring the groundwater to two 40-milliliter glass vials fitted with Teflon®-Ilned caps The vials were checked to assure that no air bubbles were present Each sample container was labeled and placed ►n 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 September 23 1999, groundwater monitoring event are summarized in Table 1 ' TABLE 1 Laboratory Analytical Methods Analytes BTEX TPH-G Gasoline Oxygenates/Additives Analytical Method 602 503OfLUFT 8260 ' Detection Limit 0 3 gg/L (BT) ) 0 05 mg(L 1 0 gg/l, 0 6 4g/L (X) 10 0 4g/L. (tert Butanol) B= benzene, toluene ethyl benzene and total xylenes TPH-(j total petroleum hydrocarbons quantified ay gasoline vasolme Oxygenates/Additives—methyl tertiary butyl(-cher(M FB ), ethanol tertiary-butanol di-isopropyl ether(T)IPI-) ethyl tertiary-butyl ether(1-,TBF)and tertiary amyl methyl ether(TANH-) ' 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, MTBE, and TAME were detected In the groundwater sample collected from MW-2 at concentrations of 1 6, 92,000, and 520 micrograms per liter (pg/1), respectively TPH-G was detected in the groundwater sample collected from MW-2 at a concentration of 0 05 milligrams per ' liter (mg/1) Benzene, total xylenes, MTBE, tertiary butanol, and TAME were detected in the groundwater sample collected from MW-3 at concentrations of 3 8, 1 4, 9,400, 290, and 33 pg/l, respectively The laboratory reported detection limits associated with 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 10 lug/l, 49 µg/l, and 0 20 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 1 IL� CONDOR