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MARION COUNTYICENTURY WESTS ESTIMATE <br />TASK IIIB: ADDITIONAL CHARACTERI7ATIO~UREMEDIATION • USED OIL UST <br />Assumptbns: <br />Remove contaminated soil: lafeet thkk (5~15 feal bgs) by 20.tee1 diertrota =120 abic yards <br />Excavafe 130 cubk yards overburden (slopad sidewalls) to aaess contaminated soil <br />Dewaler compkted excavation, dispose ol water, sampb racharge wata IMo excavefion <br />Pumped groundwater. 4 teet deep by 24tee1 diameter x 1.5 recharge volumes =14,100 galbns <br />Soil samples from 4 excavation walls end floor + 1 stockp~e (disposaq analyzed fa used oil camponents <br />B~II wilh 120 cubic yards imparted Gean fill with dean overburden <br />RepoRing included h Task IV <br />1.4 tanslCY fa soil <br />Pro)ect Manager (work plan, contraGing) $80 3U S2,4W 52,400 <br />GeologisUEngineer $50 50 $2,500 52,500 <br />Soll TPWquantAfcaGon E125 6 $750 5750 <br />SaIBTEX 370 6 S420 5420 <br />Sai PCBs S9U 6 $~ S~ <br />Soil3 TCLP metals 5124 6 $7A4 5744 <br />Soil halogenated volatile organics 510.5 6 5630 5630 <br />GroundwaferTPIW18.1 S65 2 5130 5130 <br />Graundwater PAH 3215 2 5430 5430 <br />Graundwater BTEX 570 2 $14U 5140 <br />Excavate soil (250 CY) 320 250 85,000 3~~~ <br />Sailtransporlatbnldisposal(120C1~ $43.50 120 55,220 $5,220 <br />Groundwater disposal (14,100 galbns) $0.40 14,100 55,640 $5,640 <br />Impoded fill (12o Cl~ S6 t20 372o S72o <br />Ex nses S~ $300 <br /> <br />TASK IIIC: ADDITIONAL CHARACTERIZATIONRtEMEDIATION • SOUTHEAST <br />Assumptions: <br />Install 1 well to southeast in viGnity ot CouA and Church SVeet mtersectian (to 25 feeq <br />Instatl 2 air sparge poinls and connect to remediation system <br />Malne 2 soil sampkslbodng +~ qA <br />Sampielanalyze groundwater trum new monRoring well quaAerty <br />RepoAing inciuded in Tasks II and IV <br />DriUh9 rates based on quotes from GeaTech Expbrations, Inc. <br />Pro}eG Manager (wak plan, contrading) S80 25 SZ,000 ~Z~000 <br />GeologisNEngineer 5~ ~ 52,500 i2,500 <br />Soil TPHlquaMification 5125 9 $1,125 51,125 <br />Soi18TEX S10 2 5140 $140 <br />GroundwalerBTEX S70 20 51,400 51,400 <br />DrillingConVacta-airspargepoints $876 2 $1,752 51,752 <br />DrillingConlraGa-well 51,036 1 $1,036 51,036 <br />Connedion to system 51,000 S1,OOU <br />Ex nses a~ ~ <br /> <br />COURTHOUSESQUARE <br />CHEVRON'S REMEDIATION SCENARIO <br />COST ESTIMATE <br />CHEVR~NIPACIFIC ENYIRONMENTAL GROUP'S ESTIMATE <br />TASK IIIB: ADDITIONAL CHARACTERIZATIONRtEMEDIATION - USED OIL UST <br />Assumptiais: <br />pacil'~e reporled'Excavation and disposal of 100 yards of soiP fa 56,500 <br />H doas not appeaz that cosU to rertwve overburden to eaess contaminated subsurface soil wero included <br />H does not appeu ihat costs to dewater the excavatlon, sampb weter, a dispose oi wata were included <br />H does rrol appear ihat costs to replace tha excavated ~oil wero included <br />1.4lonslCY fa soil <br />Laba <br />SoB TPWquantification 4 <br />Soil BTEX ~ <br />SoiIPCBs ~ <br />So13 7CLP metals ~ <br />Soil halogenated volatile organia 1 <br />Groundwater TPF+418.1 ~ <br />Groundwater PAH ~ <br />Groundwaler BTEX ~ <br />Excavafe sail (100 CY) 1D0 51,000 <br />SoilVansportatbNdisposal(t00C`~ $51.80 iD0 <br />Groundwater disposal ~ <br />Imported fn ~ <br />Ex nses <br />TASK IIIC: ADDITIONAL CHARACTERIZATIONfREMEDIATION • SOUTHEAST <br />Assumpdons: <br />It dces not appear thal wsts to address potentlal ofl-site contaminatbn to Ne souVieast were inGuded, <br />aHhough some portbn of the 3 air sparge welis and 2 groundwater wells included in Task IIIA may <br />be intended fa this bcation <br />~ ~ <br />COMMENTS <br />a6,500 to excavate contaminated soil, including oversight labor, field and olfice <br />expenses, and anarylical costs appears to be inadequate. <br />Number oi sail samples inadequale fa walis, fbor, and disposal. <br />Soil BTEX required fa used ofl sites. <br />Groundwater PAH required fa used oil sRes. <br />Grcwndwater BTEX required fa used dl siles. <br />Chevron must inGude costs to remove overburden to access contaminaled <br />subsuAace soil. <br />Chevron must inGude costs to dewater the excavaHon, sample water, and <br />dispose of water. <br />Chevron must include costs ro replace the excavated soil. <br />Chevron will likety ba required to delneate ihe extent ot soil and groundwater <br />contamination southeasl ot the UST nest to oblain cbsuro; the'r estimate doea <br />not appear fa indude sampl~g and anayses of wil and groundwater to <br />delineata contaminatbn. <br />~entury West Engineering Page 2 DRAFT- CONFIDENTIAL ATTORNEYICLIENT WORK PRODUCT 2&May97 <br />