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Herman&Helen N Marina-First Quarter 1999 Groundwater Monitoring April 11 1999 Page-3 vials were checked to assure that no air hubbies were present Each sample container was labeled and placed in a I cooler chilled with Ict, and delivered under chain-of-custody procedures to GeoAnalytical Laboratories, Inc, in Modesto California within 24 hours of sample collection Results of laboratory analyses are discussed to Section 3 3 ' 3 2 LABORATORY ANALYTICAL METHODOLOGY Fhe analytical methods for laboratory analyses of the water samples collected during the March 26, 1999 ' groundwater monitoring event are summarized In Table l I TABLE 1 Laboratory Analytical Methods Analytes BTEX TPH-G Gasoline Oxygenates/Additives I Analytical Method 602 5030/LUFT 8260 Detection Limit 0 3 }ig/L (BTE) 0 OS mg/L 1 0 µ� 0 6 gg/L. (X) 10 0 }tg/L (tert Butanol) rBTF X ben/enc,to[uenc ethyl benzene and total xylenes TPI{-(, total petroleum hydrocarbon-, quantified as gasoline (ra%oline Oxygenates/Additives=methyl tertiary butyl ether(M]BF) ethanol tc tiary-butanol di-isopropy I ether(DIPF) eth)[ternary-hut)€ ethLr(ETRE)and tcstiary amyl methyl ether(TAMC) 3.3 LABORATORY ANALYTICAL RESULTS ' BTEX constituents and TPM-G were not detected at or above the laboratory reported detection limits in the groundwater samples collected from MW-1, MW-2, and MW-3 Laboratory reported detection limits were raised for the samples collected from MW-2 and MW-3,however Benzene and total xylenes were each detected in the groundwater sample collected from MW-4 at a concentration of I2 micrograms per Iiter (pg/1) TPH-G was detected in the groundwater sample collected from MW-4 at a concentration of 0 07 milligrams per liter (mg/1) MTBE was detected in the groundwater samples collected from MW-2 and MW-3 at concentrations of I 130,000 and 7,200 jig/I, respectively TAME was detected in the groundwater sample collected from MW-2 at a concentration of 1,300 µg/1 The gasoline oxygenates other than MTBE and TAME were not detected at or above the laboratory reported detection limits in any of the groundwater samples Laboratory reported detection I limits for the sample collected from MW-2 were raised, however The laboratory analytical results of the groundwater samples are presented in Table 2 on the next page and in I-igure 3, Appendix A Historical groundwater monitoring data are included in Table 3, in Section 3 4 t� CONDOM