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� 1 <br /> at <br /> 0BA <br /> _e wea location res the gradual slope of land <br /> 206 <br /> epand delpalsforaydrosce, and wa rable elevations (AMEC, 20091, <br /> The <br /> urlare ddeposition darn, dwmer <br /> The water <br /> table (e-zone) occurs at approximately ss to 30 feet this on-Site and varies seasonally, with <br /> highest elevation In the first and second quarters and the lowest elevation generally In the fourth <br /> quarter 'oaober). TheWry hydraulic gradient eefNgior (HaleyIt Aldrricch, 219),en north-neurflonal In the <br /> Upper <br /> anamtenmehate Anrmanam nmew wells n ua 19adinferred <br /> r monitoring <br /> i groundwatera senta oaa er emTg z <br /> dof groundwatertions measured <br /> area . <br /> 2etle promptivpnmateaaseries of remedial aamun upon discovery ofTce in Site groundwater in Icing, <br /> meduame Ifipok?phases of so a au and ggroundwogress �'nex cleanup. <br /> sail�and re roundwater <br /> commitments <br /> medimwne nave translated <br /> tudeto is levels below des goals vemlwells within the <br /> on Site <br /> sitesourceareaveral orders of magnitude tole ups removed <br /> mov of <br /> aura pounds <br /> ofVemeceareas ecurrsn groundwater <br /> reme efforts rantarewaldes two expanded <br /> e sof U,dt . Theul current n mthe oxzm reactive <br /> north endof Walnut Snwellsrtreatment <br /> reat ntbE Iroata mated grounr� er ai me to zone via x wells at <br /> for <br /> on(In1-11IU carbon 2Am on-Site (Figure 2).Theo llow rate forthe groundwater <br /> treatment syste reach approximately 21 gallons per rumors. <br /> n began <br /> ore than 30 <br /> ars <br /> concegM1munsProgress U and has <br /> ts less chlorinance ted biodegradation nProductz cis1, 3CEE and vinyldtmr , <br /> er <br /> co be defected acted some <br /> gg grofingundwater <br /> Maximumwelts. TheCorporatise ns Levels V re he m craineshemicals <br /> oIftf con xim (coal for this report. Chwrobrmitoring was detected In loll vapor near the former on Sitem <br /> kasfrom nearby groundwaterwel`s and therefore salsa <br /> laboratory and in samplesn groundwater samples, methylerw chloride will also be considered <br /> WC for Igo iAlthough malrganoten due <br /> to as <br /> i ve o duem 'rtsPast use at the faaliry. <br /> 2.3 PRIOR VAPOR RITRUSION ASSESSMENTS <br /> The most recent soil vapor and Indoor air sampling was completed between July 2006 and August 2008 <br /> at Iocatiom on-Site, west of the Site and at 519 Shelton Avenue (ECM, 2009).These inveseigatbns <br /> focused on areas where <br /> higher <br /> B-Airm moratoriummoratoriumll car andp proximity former vaamse zone son use auns. Soil vz par <br /> ma samples <br /> o <br /> ff&CH <br />