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Herman do Helen s Marina third Quarter 1998 C,ruundw.ater Moniuinng Novernhcr 23 1998 Page. 3- Groundwater Samples were, collected by filling the sample containers directly from the pump discharge tubing 3-he groundwater was transferred to three 40-milliliter glass volatile organic analysis (VOA) vials fitted with Teflon-lined caps (fur petroleum hydrocarbon analysts) and to a one-liter polyethylene bottle (for laboratory tested intrinsic bioremcdiation parameters - alkalinity nitrate, sulfate, and ferrous iron) rhe vials were checked ' to assure that no air bubbles were present l;ach sample container was labeled and placed in a cooler chilled with ice and delivered under chain-of-custody procedures to CGeoAnalytical Laboratories, inc , in Modesto, California, within 24 hours of sample collection l-or quality control, one rinsate sample was colleLtcd and labeled 1432-MW5-9130198 the rinsate sample was collected by pumping hydrocarbon-free water through the Grundfos Readitlo 11 submersible pump and into the sampling containers after the pump was decontaminated After the rinsate Sample was collected, the pump was used to sample monitor wel l MW-1 Results of laboratory analyses are discussed in Section 3 3 3 2 LABORATORY ANALYTICAL METHODOLOGY The methods used for laboratory analyses for the September 30, 1998, groundwater monitoring event arc summarized in Table 1 Table I Laboratory Methods 1 Analyte(s) BTFX TPH-G Gasoline Oxygenates/Additives Alkalinity Nitrate Sulfate Ferrous Iron Method 602 5030/1 UFT 8260 310 1 300 300 SM-3500-Fe MDet I imit 0 3 ug/1 (13TI-) 0 05 rngil 1 0 4g/1 10 mg/] l 0 mg/1. 1 mg/i 0 1 mg/L 0 6µg/1 (X) 10 0µg/l (tert Butanol) ' BTFX beniene toluene, ethyl bensene and total xylenes TP11-G=total petroleum hydrocarbons,quantified as gasoline Gasoline Oxygenates/Additives methyl tertiary butyl ether(MTBE),ethanol tertiary-butanol,di-isopropyl ether(DiPP) ethyl tertiary-butyl ether(ETBE)and tertiary amyl methyl ether(TAME) ' 3 3 LABORATORY ANALYTICAL RESULTS BTEX, TPH-G and the selected gasoline oxygenates/additives were not detected at or above the laboratory ' reported detection limits in the sample collected from MW-1 or the rinsate sample (1432-MW5-9/30198) Ethanol, tertiary-butanol, DIPS, and ETBE were not detected at or above the laboratory reported detection limits in any of the groundwater samples Toluene was detected at a concentration of 7 0 µg/l in the groundwater ' sample collected from MW-2 Benzene, ethyl benTene, and total xylenes were not detected at or above raised laboratory detection limits in the sample collected from monitor well MW-2 BTEX constituents were not detected at or above raised laboratory reported detection limits in the groundwater sample collected from MW-3 ' TAME was detected in the groundwater samples collected from monitor wells MW-2 and MW-3 in concentrations of 270 µg/l and 22 gg/l, respectively TPH-G constituents were not detected at or above a raised and a standard laboratory reported detection limit in the samples collected from MW-2 and MW-3, respectively The analytical detection limits associated with BTEX constituents for the samples collected from monitor wells MW-2 and MW-3 were raised, due to relatively high concentrations of MTBE in the samples collected from those wells MTBE was detected at 59,000 pg/1 and 5,900 4g11 in the samples collected from MW-2 and MW-3, ' respectively The analytical detection limits associated with BTEX constituents for the sample collected from MW-4 were also raised due to the presence of petroleum hydrocarbons in the sample Benzene, ethyl benzene, . total xylenes, and MTBE were detected in concentrations of 35 gg/l, 15 4g/1, 13 gg/l, and 3 7 pg/l, respectively, ' in the sample collected from MW-4 A concentration of 0 2 mg/I of TPH-G was detected in the sample collected ow NZ6—w ' t� CONi)OR