Laserfiche WebLink
COURTHOUSE SQUARE <br />PRE-CONSTRUCTION REMEDIAL ACTIVITIES - FORMER CHEVR~N PARCEL <br />PARTIAL SOIL REMOVAL <br />DRAFT COST ESTIMATE ~ <br />General Assumptions: <br />~ Site remediation activities will be conducted prior to construction excavation ' <br />Chevron will decommission their remediation system prior to excavation, including subsurFace ~nd <br />aboveground components <br />1-level subsurface garage will be constructed on former Chevron parcel ' <br />Soil will be excavated to approbmately 12 feet bgs for parking garage; therefore, remedial soil ~xcavations <br />will extend to a minimum of 12 feet bgs <br />The extent of soil excavation may leave some soil above the DEQ Level II cleanup stanqards <br />Soil and groundwater samples collected from the former Chevron parcel will be analyzed by a' <br />mobile laboratory, which will provide DEQ-acceptable data in rush turnaround to prevent dela~s <br />in excavation and disposal activities <br />Remedial excavations on the parcel will take approbmately 2 weeks <br />Backfilling excavations to slab grade (if necessary) would be conducted by the construction corttractor <br />Units rates for contractors are appro~amate and will be replaced by bid rates ' <br />Task IV (3 years groundwater monitoring) may not be necessary if soil excavation/dewatering r$sults <br />fully support site closure <br />Chevron is responsible for decommissioning their monitoring/sparge wells <br />TASK I EXCAVATION - UST NEST ~~~I <br />Assumptions: ', <br />Excavate 600 cubic yards of gasoline-contaminated soil in the vicinity of the UST nest (12-16 fe~t bgs) <br />Soil confirmation samples will be collected from the walls at the soiVwater intertace and from the!floor <br />8-day mobile lab rental fee is shown entirely in this task, and is independent of the quantity of sa~nples <br />Dewatering costs included in Task III <br />Repo~ting included i~ Task V ~ <br />Labor costs include project management, excavation oversight, and sampling I <br /> Project Manager - <br />$88 -. ...__.~..._....~ ::::,-:-:~.~..,~r.~~-: <br />40 $3,520 . . . - <br />, . > . ~~a <br />$3 <br />520 <br />~ Geologist/Engineer $60 80 $4,800 , <br />$4,800 <br /> Soa overburden excavation (cubic yards) $6 1100 $6 <br />600' $6 <br />600 <br /> PCS excawation (cubic yards) <br />Soil transportation $8.25 600 , <br />$4,950 ~ , <br />$4,950 <br /> <br />Soa disposal $21.30 <br />531 <br />50 600 <br />600 $12,780' $12,780 <br /> <br />Mobile lab . <br />$1,610 <br />8 518,900 I <br />512 <br />880 i $18,900 <br />$12 <br />88 <br /> <br />Ex~enses , , <br />0 <br />TASK II: EXCAVATION - USED OIL UST ' <br />Assumptions: <br />Remove contaminated soil: 10-feet ~ick (5-15 feet bgs) by 20-feet diameter = 120 cubic yards <br />Excavate 130 cubic yards overburden (sloped sidewalls) to access contaminated soil <br />Soil samples from 4 excavation walls and floor + 1 stockpile (disposal) analyzed for used oil com{~onents <br />Analybcal costs (mobile lab) included in Task I except for metal analyses <br />Dewatering costs included in Task III ~ <br />Repofing induded in Task V <br />1.4 tons/CY for soil ' <br /> <br />ro~ect Manager . .__ <br />$88 .._ ___"_._.'-_. ._ -.... ~~~.vaS~~<CCV . <br />20 a1,760 . {1IJRi• .... _s:~~ <br />$1 <br />760 <br /> Geologist/Engineer $60 40 $2,400 , <br />$2,400 <br /> Soil 3 TCLP metals $~24 3 $3~2 $3~2 <br /> Soil overburden excavation (cubic yards) $6 130 $780 j $780 <br /> PCS excavation (cubic yards) $8.25 120 $990 '' $990 <br /> <br />~ Soil transportation <br />Soil disposal $21.30 <br />$31.50 120 <br />120 $2,556 ' <br />' $2,556 <br /> <br />Ex enses $3,780 <br />; <br />,,~,,,, , $3,780 <br />Century West Engineerinp ~e ~ <br />24-Ju1-97 <br />