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MARION COUNTYICENTURY WESTS ESTIMATE <br />TASKIV: CLOSUREACTMTIESRtEPORiING <br />Assumptiais: <br />Abandon 11 monilaring welb and 9 arc sparge poiMa <br />Since ak monMaing is an k~d(red meature of soil remediatan, confirtnation soil samples <br />are required by DEQ to evaluate Ne eBecthrenas of remediatlon <br />Drill 4 borings (to 25 feet) wilhin UST nest and to southeast <br />Anayze 2 soil sampleslbaing +i QA <br />Report findings from Tasks IIIA, B, and C and IV and justity unresUiCed NFA to DEQ <br />Projed Manager (contracting, fieM, rpt) S80 40 53~200 $3,200 <br />Review S90 4 a360 $360 <br />GeobgisUEngineer (field, reporting) a50 60 53,000 $3,00p <br />Drafla $45 8 $360 s360 <br />ProjectAssistaM $40 6 $240 5240 <br />SopTPWquanlificatbn $125 9 $1,125 51,125 <br />SoiIBTEX S70 4 $260 a280 <br />Drillin9Contractor•borings 5526 4 $p,104 $2,ipq <br />DrillingCanVada•weNabandonment 510,147 510,147 <br />Field Expenses ~pp ~ <br />Olfice Expenses 5150 5150 <br /> <br />TASKV CONTINGENCY <br />Assumptions: <br />Groundwater remediation may not he wmplete afier 5 years al operation <br />Contingency to operate Veatment system fa an addilional 3 years (3!5 x costs hom 7asks I and II) <br />COSTSUMMARY <br />TASK I: SYSTEM OPERATIOWMAINTENANCE 588,800 a17,800 5106,600 <br />TASKII: QUARTERLYMONITORINGIREPORTING s40,900 513,400 a54,300 <br />TASK IIIA: ADDITIONAL CHARIREMEDIATION - UST NEST yt,9D0 532,049 $36,949 <br />TASK IIIB: ADDITIONAL CHARIREMEDIATION • USED OIL UST y1,900 ;20,664 a25,564 <br />TASKIIIC: ADDITIONALCHARJREMEDL4TION-SOUTHEAST a4,500 a6,753 a11,253 <br />TASKN: CLOSUREACTIVITIESIREPORTING $7,160 $14,106 $21,266 <br />TASK V: CONTiNGENCY sgg gqp <br />COURTHOUSESQUARE <br />CHEVRON'S REMEDIATION SCENARIO <br />COST ESTIMATE <br />CHEVRO~UPACIfIC ENVIRONMENTAL GROUP'S ESTIMATE <br />TASK N: CLOSURE ACfiIRIESIREPORTING <br />Pacfic repated "Well abandonments (9 AS wells and 9 GW wells)" fa E8,325 and'Cbsure repaing" <br />fa 51,000 <br />ft doea not appear thal costs to confirtn adequate soil treatment fa dosure were incWded <br />Akhaugh there are artently 9 groundwaler wells instalkd and Pacific proposed fo instaq 2 additi~onal <br />groundwater wells, Pacific specified abandonment of ony 9 GW wells <br />7ASK V: CONTINGENCY <br />Assumptions: <br />Chevron has not ~Guded such a contingancy <br />ws i <br />non~. a~o~cmurtrc~siiun~mRirvitrvr~nct s7~gOp <br />ASKII: QUARTERLYMONITORINGIREPORTING §Zq,7pp <br />ASK IIIA: ADDITIONAL CHARJf2EMEDIATION - UST NEST 514,650 <br />ASK IIIB: ADDITIONAL CHAR.IREMEDIATION - USED OIL UST 56,500 <br />ASK IIIC: ADDITIONAL CHAR.IREMEDIATION • SOUTHEAST Sp <br />ASK IV: CLOSURE ACTIVITIESlREPORTIN~ $9,325 <br />ASKV: CONTINGENCY en <br />~~ <br />COMMENTS <br />So7 cbsure confirmatlon sampks will likety be required to address exposure <br />pathways consisteM wilh the hrture use of ihe property. <br />51,000 to report all chareder¢atlon and remedial activities han Task III and <br />juslity site cbsure based on hiture use of the property (exposure azsessmems) <br />appears to be inadequa4q. <br />Chevron must hclude costs to confirm adequate sotl 1reaUnent fa cbsure. <br />Eleven monitaing wells wouM requiro abandonmem, no1 nine welb. <br />Since it was ony assumed fhat groundwala remediatbn woukl be compkted <br />in fna years, adding a contingency ta edditlonal years M operetbn, <br />maintenance, rtanitoring, and repoA(ng h approprlate. <br />~entury West Engineerhg Page 3 DRAFT- CONFIDENTIAL ATTORNEYICLIENT WORK PRODUCT 21May-97 <br />