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I Herman& IULn s Marin - l uunh(quarter 2000 Gwuntlwarer Monrtortng January I2 2001 ' Page � TABLE 1 ' Laboratory Analytical Methods Analytes t _ BTEX TPH-G Gasoline Oxygenates/Additives Analytical Method 8021 B 5030/1 UFT 8260B ' Detection ).Smit 0 3 �tg/L (BTI/) 0 05 ino 1 0 µg/L 0_6 4g/I (X) 10 0 l-g/L (tert Butanol, ethanol) ' mg/1 milligrams per liter(parts per million) µg/1 micrograms per liter(parts per billion) BTI-X hen7t,nL toluene ethyl beniene and total xylenes TPIt-(r total petroleum hydrocarbons quantified as gasolme. ' Gasoline Oxygenates/Additives methyl tertiary butyl ether(,MTBE),ethanol,tertiary-butanol di-Isopropyl ether(DIPF•) ethyl tertiary-butyl ether(ETBL)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 MTBE was detected in the groundwater samples collected from MW-2 and MW-3 at concentrations of 14,000 and 4,100 micrograms per liter (}Lg/L), respectively BTEX, TPH-- G and the other gasoline oxygenates/additives were not detected at or above the laboratory reported detection limits in the groundwater samples collected from MW-2 and MW-3 The laboratory reported detection limits associated with the gasoline oxygenates/additives were raised for the groundwater samples collected from MW-2 and MW-3, however Benzene, ethyl benzene, total xylenes, MTBE and TPH-G were detected in the ' groundwater sample collected from MW-4 at concentrations of 3 4 pg/L, 4 2 µg/L, 120 µg/L, 1 4 pg/L and 0 67 milligrams per liter (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 on page 6 1 1 1 ' 4"• CONDOR