ARCHIVED REPORTS XR0006998 - Laserfiche WebLink

Home Browse Search

r , Iierrnan&iieicn N Marna v.t Quarter, 1998 Groundwater Monitoring April 16 1998 r Pagc 4 decontaminated as debcnbed above After the ansate sample was collected, the pump was used to sample monitor well MW-1 Results of laboratory analyses are discussed in Section 3 2 and Section 3 3 r 3.2 LABORATORY ANALYTICAL METHODOLOGY 1'he methods used for laboratory analysis for the March 27, 1998, monitoring event are summarized in fable 1 rTable 1 Laboratory Methods rAnalyte(s) ]31] X 1PII-(r GdSolme Alkalinity Nitrate Sulfate. Perrous Iran Oxygenate,;/Additives rMethod 602 5070/1 UI 1 8260 710 1 700X00 SM-7500-I c Det I unit 0 7 µg/I 1 0 ng/I 1 0 µg/I 10 Mn-/I 1 0 mg/I I ng/I 0 1 ng/I r (BTI') 10 0µg/I (tert 0 b µ91I, Butanol) (X) r 131PX—berverie„tnluCne ethyl benzene,and total xylene-, 1 P,1-1, =total petroleum hydrocarbons, quantified as ga-,olunL (rasolme Oxygenate ,/Addutr%,e-, methyl tertiary butyl ether(lei 1-131 ),ethinol,tertiary-butanol,du-isopropyl Lthcs(DIPI ) ethyl ti.rtiary-bulyl Lthcr(P ITB] )and tertiary amyl methyl ether(iAMI-) r3 3 LABORATORY ANALYTICAL RESULTS Laboratory analyses of groundwater samples collected from the site monitor wells indicated that BTPX, TPH-G rand the selected gasoline oxygenates/additives were not detected at or above the laboratory reported detection limits in the sample collected from MW-I or the rinsate sample (1432-MW5-3127198) Ethanol, tertiary-butanol, rDIPh, ETBE, and TAME were not detected at or above the laboratory reported detection limits in any of the groundwater samples Detection limits for the analysis of the samples collected from MW-2 and MW-3 were rraised, however, due to relatively high concentrations of MTBE, in the samples collected from those wells (as described below) Ben/ene and TPH-G were not detected at or above raised detection limits and toluene, ethyl rbenzene and xylene were detected ranging from 3 6 µg/I to 43 µg/1 in the sample collected from MW-2 MTBE was detected at 110,000 µg/1 in the sample collected from MW-2 BTEX and TPH--G were not detected at or rabove the laboratory reported detection limits in the sample collected from MW-3 MTBE was detected at 1,900 µg/1 in the MW-3 sample TPH-G was detected at 0 52 mg/I and BTEX constituents were detected ranging from r1 5 µ911 to 100 µg/1 in the sample collected from MW-4 MTBE was not detected at or above the laboratory reported detection limit in the MW-4 sample The laboratory results of the groundwater samples are presented in Table 2,below Historical groundwater monitoring and analytical data are included in Table 4, in Section 3 4 rL� CONDOR