ARCHIVED REPORTS XR0006990 - Laserfiche WebLink

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hmit in tht- tiu11p1L L01leLted atom this well f lo,itulCy product or 'Acle not obSLrvLd cn the, Mroundwater rLmoyLd Item the nlolirinr wLlls 1 Slight pLtlnlLunl IiNdrocaibon odor \Nas noted In thL groundx�atcr sample LC711LLtLd i:om 1ti1W-, I ahoiatory aiiah ttLal results of the groundwater samples LolleLted during the, second quarter 1999 molutonng Lyent wLie �Ienetally Lonslstent with historical quarterly groundwater analytical data C01ILLnnatlons of MTBE dctcLted M the Sample~ Lollected from MW-2 and MW-3 on June 26 1998 appeared to reyer,L a trend of ulLrLaSI[Ig LnnLLntlatlons 11IStOl IL,1[]y detected Ili wimples LolleLted trom these welly (rtoundwatLr LIL�atlorn nreasurernnentN LolleLted at thL site monitor v~ells oil Ione 26 1998 indic,lted that the avLragL depth honl thL �_,trnrnd tiutfd,,L to groundwatLr was approximately 5 feet 11-he LveragL depth to water at thL SILL Bras LYs0111ally thL SannL ren March 1998 and IunL 1_6 1998 Groundwater Llevation Lorltours LstrrrlatLd 1151111/ CIL dLpth-to-water mLasurements LolleLted on June 26 1998 mdlLatLd that the .;toundwater gradient at the SitL vgas L;Lne:ally Lontiltitent 1v Ith the Lstimated ,Iadlent on Septemb(.1 18 199; D"Lmber 31 1997 and .MarLii _'7 I998 On SLptcmhL.r 30 1998 a ( ondor reprLsc,ntatike was on site to Londuet quarterly groundwater monitoring aLtivtties laboratory analyses of rroundwatel tramples LollcctLd from the site monitor wells indicated that 1 ILX TPH-(j and the SelectLd gasoline oxygenates/additives were not detected at or above the laboratory reported detLLt1OII limits In the, sarnpIL collected i7om MW--1 I thanol tertiary-butanol, RIPE: and 1'3'131- were not detected at of above. the laboratory reported detection limits Ili any of the groundwatc r samples The laboratory reported dCteLtiOn Innits were raised for the groundwater samplLS collected from MW-2 and MW-3 due to relatively I11!,h cnnLentrat:ons of M 1131 In thL groundwater samples Lu1leLted fiom those wells (as dLSLribed hLlow) 1 AMI wati dcteLtLd In II1L gromidwater SarliplLS LolleLted from MW-2 and MW-3 MTBE' was dct"tcd in thL groundwatLr SarilplLS LoIILLtLd from MW-2 MW-3, and MW-4 BenZCnL Ltllyl benzene, total xylenes -( and 1 PIIr were not detcc.tLd 1t or above raisedm laboratory reported detection Itrts to the groundwatLr samp[L c011LLtLd from MW-2 A low concentration of tolULne was detected In the groundwater Samp[L L01ILLted Irom MW-' 1311 X and I P][-(r wcrL not dLtLetLd at or above the laboratory reported detection limits In the groundwatet sample collected from MW-3 Elie laboratory detection Ilinits associated with the 1311A LonstltLILnts werL raised for this salnple Relatively low Loncentrations of benzene, ethyl benzene total xylenes and l PH-(j were detected tri the groundwater sample Lollected irom MW-4 Toluene was not dLtected ' at or above a i arsLd laboratory detection 1rn11t In the groundwater sample collected from this well F Ioating product o1 sheens wete not observed In the groundwater purged from the monitor wells Petroleum hydrocarbon odors weir not deteLted In the groundwater samples collected from the four monitor wells I aboratoiv analytiLal results of the groundwater ,amplL,s Lollected during thL third quarter, 1999 monitoring event were generally Lonsistent with historical quaitei ly groundwater analytical data Concentrations of MTBE detectLd In thL SaMpILS Lollected trona MW-2 and MW-3 rnLreased signtficantly with respect to the second quarter 1998 laboratory analytical results Ilie Loncentration of MTBE, reported for the sample collected from MW-3 on September 30 1998, was a historical high for thts constituent in samples collected from this well (Groundwater elevation measurements colleLted at the site monitor wells on September 30, 1998 indicated that the average dLpth horn the ground surface to groundwater was approximately 5 6 feet the average depth to water at the site mLrcased by approximately one-half foot between June 26, 1998 and September 30 1998 Groundwatei elevation contours estimated using the depth-to-water measurements collected on September 30, 1998 Indrc.awd that groundwater gradient at the site was generally consistent with the estimated gradient on September 18 1997, DeLembet 31 1997 March 27 1998, and June 26, 1998 On October 1 1998 a ( ondor representative was on site to conduct quarter ly surface water sampling activities and collect a Sample of the marina s pre-treated and treated drinking water from the facility's water treatment system 1_abolatory analyses of the surface water samples indicated that a low concentration of toluene was