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BBL RECENED <br /> BIASLAND,BOUCK&LEE,INC. <br /> engineers,scinnnsa,ecorian8h <br /> JUN 12 2006 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Transmitted Via First Class Mail <br /> I <br /> June 5,2006 <br /> Mr.Michael J. hLf irna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,California 95202 <br /> Re: Response to Comments—Corrective Action Plan Revisions <br /> Former Chevron Facility 94054 <br /> 2103 Country Club Boulevard <br /> Stockton, California <br /> BBL Project#: 44636 <br /> Dear Mr. Infurna: <br /> Blasland, Bouck & Lee, Inc. (BBL), on behalf of Chevron Environmental Management Company <br /> (Chevron), has prepared this letter in to address comments to BBL'S Corrective Action Plan Revisions, <br /> dated April 3, 2006 provided by Mr. Michael Infuma of the San Joaquin County Environmental Health <br /> Department (County) during a phone conversation with David Evans of BBL late April, 2006. The <br /> County's comments to the CAP Revisions are shown in bold Italics. A response follows each comment <br /> below. <br /> Provide generalized well construction details for B-and C-zone wells. <br /> The A-zone well (MW-1 well cluster location) will be screened from a depth of approximately 25 to 30 <br /> feet below ground surface (bgs). The B-zone wells (MW-1, MW-2, MW4 and MW-9 well cluster <br /> locations) will be screened from a depth of approximately 40 to 50 feet bgs. To prevent the potential for <br /> cross contamination between the A- and B- flow zones the B-zone wells will be double cased. The first <br /> casing will be set and sealed at a depth of approximately 35-feet bgs. Once the outer casing is set, the <br /> bore hole will be advanced to the 50-foot depth to allow for installation of the B-zone monitoring wells. <br /> A generalized well construction detail for B-zone wells is shown on Figure 1. <br /> The C-zone wells(MW-1, MW-2,MW4 and MW-9 well cluster locations)will be screened from a depth <br /> of approximately 70 to 80 feet bgs. To prevent the potential for cross contamination between the B- and <br /> C- flow zones the wells will be double cased. The first casing will be set and sealed at a depth of <br /> approximately 60-feet bgs. Once the outer casing is set, the bore hole will be advanced to the 80-foot <br /> depth to allow for installation of the C-zone monitoring wells. A generalized well construction detail for <br /> C-zone wells is shown on Figure 2. <br /> 001603054_95045 Response Lo Cosnsnents.dm <br /> 10470 Old Placerville Road,Suite 110•Sacramento California,95827 <br /> Tel(916)857-0124•Fax(916)843-1965•www.bbi-ine.com•Offices Nationwide <br />