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Nestle USA, Inc.—Ripon, CA January 28, 2011 <br /> 2011 Revised Feasibility Study <br /> Ripon Study Area Feasibility Study Executive Summary <br /> SITE HISTORY <br /> TCE PLUME CONTOURS AND SURFACE AREA <br /> Lateral extem and surface area of TCE in groundwater above 5 parts per billion(PPB)at specific points in time. <br /> Aquifer System Upper Aquifer Intermediate Aquifer Lower Aquifer <br /> _,•-_.` •Low level CE,OCE,and vC <br /> Ripon Aquifer System Conceptual Diagram - <br /> � impacts at disnete bcations <br /> - � I •TCS,oC�and VC impacts <br /> are primarily a msuh of <br /> Tti6�� fir` Vertical conduits(wells <br /> rnnorudeacl.1-and / screened across multiple <br /> E aquifers) <br /> •Vertical conduits have been <br /> _- identified and properly dosed <br /> 1 <br /> TV <br /> 71 '� <br /> i <br /> i s..r•c•>,rer W vac r,- r rtrpr I tecta.>tre•of Y�'rrae fn IMwmedl•!e <br /> .. T M•�Vt•rnl i +lq• d 7 <br /> 9 <br /> C 1 <br /> clox 200 om o ,coo auto scaa.otic W � 1 <br /> T 0 <br /> Lateral extent of TCE]5trg/L Lateral extent of TCE]5ugfL "° "'° °°° rte° "'• •'° °'° <br /> rr I <br /> Surface area of TCE 7 5ug/L Surrace area of TCE>5ug/L <br /> Hume reaps and surface area calculations forfetrke Years are based on Ripan groundwater model preditbons <br /> REMEDIATION TIMELINE <br /> It1t1t1t1t1t=11t11a IlIMIn bi.0 1 <br /> Ex-situ UV In situ bio In situ bia In situ bici In situ bio <br /> S0M � � <br /> VE VVSVE <br /> 5VE P&T <br /> P&T at N-1(production weft) P&T(remedial system) IRAP _ <br /> intrinsic remediation and fnstitudonal mrwols <br /> 19a6 'aa '95 '9Z 94 •96 98 'eo 122 'e4 'as 'Sa '16 '12 '14 2M <br /> industrial Avenue•Stockton Avenue•Ripon Study Area <br /> FEASIBILITY STUDY RESULTS <br /> T_h* Sol-ted <br /> AlternativeJ <br /> to 1 2 3 4 5 1 2 3 4 5 F asbnig sy>fems have removed oiler 1 Sop lbs of <br /> y Pump and Treat YW Y" lid VOCs and mitis offsite migration <br /> ff 1 2 3 4 5 1 2 3 4 5 Barrier technologies not necessary due W ow4nued <br /> Impermeable Barrier AO S US VOC containment provided via pump and teat <br /> systems <br /> 1 z 3 4 5 1 2 3 4 5 Barrier technologies not necessary due to continued <br /> Permeable Barrier lIi• ifs VOC Qwtainment provided via pump and treat <br /> .I. <br /> Only effective in shallow sols,vadabe tone has <br /> 1 2 3 4 5 1 2 3 4 5 been remediated.Estimated SW pounds of VOCs <br /> SVE YY ftp 1988 and 199 Estimated TICE and chloroform) <br /> 2.4r ppoounndds[primarily <br /> TCE)removed from 1999 to 2wo. <br /> 1 2 3 4 5 I 2 3 4 5 Presence of day lenses and site heterogeneity make <br /> Air Spalging No N• ■ ■ this technology ineffective <br /> Elevated TM and metal concentration is a conceal. <br /> RedUctve pehalogenatian yesH 1 2 3 4 5 1 2 3 4 5 �! In addition,a full scale pilot study may be necessary <br /> necessary' ■ Ti to determine the success of complete degradation <br /> of 7CE <br /> Chernkal CbMation/ bf r 2 3 4 5 t 2 3 4 5 Mod effective in areas where VOC Gonoerltdtons <br /> Aerobic Cametabalism Y■i neemaw ■ are]tnoo ugA <br /> r 2 3 4 5 1 2 3 4 5 provides VOC mass reduction with minimal Impact <br /> 1nV <br /> insic Remediation Ytai Yes on groundwater resources <br /> testers�t t 2 3 4 5 I 2 3 + s 1Nater Replaoemem Cont mgeruy Plan has been <br /> prepared <br /> Vicon Destnx;�on(wells acting asn` 1 2 3 4 5 t 2 3 4 5 Prevents vertical migration and pretedfs longer <br /> conduits or already impecb4 aquifers. <br /> Municipal and odor r 2 3 4 5 1 2 3 4 5 IllsMinimizes addWmm[migration of VOCs in g olnd- <br /> pumping Coordination wateT <br /> Property use Restrictions 1 2 3 4 5 1 2 3 4 5 Protects reavlors and promotes wC Migration <br /> [e g,well drilling restrictions) no Y control <br /> '[hese remedial technologies may be utilized H pump and treat noes not svffidently reduce VOC mma at the Industrial Ave.Source Area <br /> SELECTED REMEDIAL ALTERNATIVE <br /> Containment Pump and tree[(at ki&tWWl Avenue) • ■ ■ • ■ ■ / r ■ <br /> Irrpr 7reetrnerrt kthi rs c renoeetiation r ■ • • • • ■ r I • <br /> •Protea human heakh and file errvirnnrricrt r _ <br /> • <br /> 15 years to meet remedial owls lteduxrive faucet <br /> Suliidenty rani plume migration In-Sftir treatment Chemical aoddadorJ bit cometabolism <br /> Promotes efficient use of groundwater resources •Cd necessary.following assessment of permeablech baffler <br /> a a ■ ■ a ■ a r • <br /> Optinhes environmental atiaty 3 years of pump and treat) Impermeable barter <br /> •Considers input from Joey stakeholders <br /> water supply replarsrrrad <br /> Insthrtanal Controls Yvan destruction • ■ • • ■ • a ■ ■ <br /> Municipal pumping opordnatlprm <br /> Evaluatorllresl<ictien on new well ralaYation <br /> •-Yes Effectiveness:5—Very Effective;1-Not EfkK*m _Varlr V Cost U —Upper Aquifer SVE-Soil Vapor Fxtraclion <br /> •:NO Implementahility:5=Very Easy;t=Very Hard High Cost 1 =Intemrediate Aquifer P&7=Pump and Treat <br /> R Necessary Time to meet RAOs:1.30 years MV&um Cast L e Lower Aqulter In Situ 9io—In situ SiorernMistion <br /> =Low Cost IRAP—Imetim Remedial Action Han <br /> I I <br />