ARCHIVED REPORTS XR0006987 - Laserfiche WebLink

Home Browse Search

1 limit ,n ihL santplL LOJILLted from this well Floating product of sheens were not observed in the -roundwater rc,moved from thL monitor wLlls A slight pLtroleum hydrocarbon odor was noted In thL groundwater sample • collected from \/[W--" ' 1 aboratory arnalvtiLal results of the rroundwatLr samples collected during the second quarter 1998 monitoring LVLnt wLie ,LnL[allr LonsistLnt With 111StOr[La1 quarterly groundwater analytical data CUnLLntraIlons of MTBE ' dLtLLtLd in the saniplcs Lollected from MW-'- �tnd MW-3 on June 26, 1999 appeared to iLversL a trLnd of inc,rLasIne LonLcntrntions historical]} detLLted in samples Lollected tiom these wells (,rot:ndw ltL[ LlLtiation llleasuremuits LoIILLtLd at the site monitoi v+ells t7n lunL 26 1998 indicated that the average dLpth from the mound surfaLe to groundwater was appioximately 5 feet the average dLpth to water at thL sitL Ntas LssLntia]ly the same tin March 27 1998 and lune 26 1998 Groundwater L]Lvation Lontours Lstirnated usinLI thL dLptlt-to-water measurements Lollected on June 26 1998 indicated that the groundwater ' giad]Lnt at the site was gencially consistent with thL estimated giadtent on September 18 1997 I)Lcember 31 1997 and March 27 ]998 ' On September 30 1998 a ( ondor representative was on site to conduct quarterly groundwater monitoring activities €,aboiatory analyses of groundwater samples collected from the site monitor wells indicated that ' BTEX, TPE1-(j and the selLcted gasoline oxygLnates/addLtives were not detected at or abovL the laboratory reported detection limits in the sample collected ti om M W-1 f.thanol, tertiary-butanol, DIPL, and L FBE were not detected at of above the laboratory reported detection limits in any of the groundwater samples File laboratory reported detection limits were raised for the groundwater samples collected from MW-2 and MW-3 ' due to relatively high concentrations of MTBE in the groundwater samples collected from those wells (as described below) FAM[_ was detected in the groundwater samples collected from MW-2 and MW-3 WIRE was dLteLted in the groundwater samples collected From MW-2 MW-3, and MW-4 Ben/ene ethyl beivene, I. total xylenes and FPH-Cr were not detected at or above raised laboratory reported detection limits In the groundwater samplL col ILeted from MW-2 A low concentration of toluene was detected in the groundwater samplt, collected from MW-2 B`11.X and TPFE-(j were not detected at or above the laboratory reported detection limits m the groundwater sample collected from MW-3 [he laboratory detection lit-nits associatLd with the BT1 X constituents were raised for this sample Relatively low concentrations of benzene, ethyl benzene total xylenes, and TP11-G were detected in the groundwater sample collected from MW-4 Toluene was not detected at of abovL a taisLd laboratory detection limit in the groundwater sample collected from this well Floating product of sheens were not observed in the groundwater purged from the monitor wells Petroleum hydrocarbon odors were not detected in the groundwatci samples wllected from the four monitor wells laboratory analytical rLSLIltS of the groundwater samples collected during the third quarter, 1998 monitoring event were generally consistent with historical quarterly groundwater analytical data Concentrations of MTBE; detected in the samples collected fiom MW-2 and MW-3 increased significantly with respect to the second quarter 1998 laboratory analytical results The concentration of MTBE reported for the sample collected from MW-3 on SLptLmbLi 30 1998 was a historical high for this constituent to samples collected fiorn this well Groundwater elevation measurements collected at the site monitor wells on September 30 1998 indicated that the average depth tion the ground surtace to groundwater was approximately 5 6 feet The average depth to ' water at the site increased by approximately one-half foot between June 26, 1998 and September 30 1998 GroundxNatet ele,.ation contours estimated tlsing the depth-to-tiNatei measurements collected on September 30, 1998, indicated that groundwater gradient at the site was generally consistent with the estnnated gradient on September 18, 1997 December 31, 1997 Match 27, 1998, and June 26, 1998 • On Octobei l 1998 a Condor representative was on site to conduct quarterly surface water sampling activities and collect a sample of the mai ina's pre-treated and treated di inking water from the facility s water treatment system Laboratory analyses of the surface water samples indicated that a low concentration of toluene was