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Y �J <br /> BBL [R COVED <br /> BLASLAND,BOLICK&LEE.INC. C� <br /> engines;s,sci HsK econo n <br /> Transmitted Via Email and First Class Mail <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> April 3,2006 <br /> Mr.Michael J.Infirrna <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue,Third Floor <br /> Stockton, California 95202 <br /> Re: Corrective Action Plan Revisions <br /> Former Chevron Facility 94054 <br /> 2103 Country Club Boulevard <br /> Stockton,California <br /> BBL Project#: 44636 <br /> Dear Mr. Infuma: <br /> Blasland, Bouck & Lee, Inc. (BBL), on behalf of Chevron Environmental Management Company <br /> (Chevron), has prepared this letter to propose revisions to SECOR International Incorporated's <br /> (SECOR's) Corrective Action Plan (CAP), dated June 28, 2004, for the former Chevron Service Station <br /> 94054 located at 2103 Country Club Boulevard in Stockton, California. The proposed revisions are <br /> intended to modify both the tasks, and the sequence of the tasks outlined in the CAP. The intention of <br /> this revision is to develop greater certainty regarding the need for excavation. Excavation may reduce <br /> groundwater concentrations beneath the site; however, without understanding the potential exposure <br /> pathways (vapor inhalation pathway and groundwater plume stability) the effect of the excavation will <br /> have unknown benefits. <br /> The current sequence of work activities as defined in the CAP are detailed below: <br /> 1. The excavation of petroleum hydrocarbon impacted soil located in the area of the former <br /> underground storage tank (UST) pit complex to a depth of approximately 23 feet below ground <br /> surface (bgs). The excavation will be limited to approximately 2,000 cubic yards (yd) and/or as <br /> conditions permit; <br /> 2. The completion of six cone penetrometer test (CPT) borings to assess soil lithology and <br /> stratigraphy; and <br /> 3. The installation of six groundwater monitoring well clusters to monitor deeper groundwater <br /> impacts. <br /> BBL proposes to modify both the sequence and proposed work activities as defined in the CAP as <br /> follows: <br /> 1. Confirm that the plume is stable within the deeper groundwater flow zones (i.e.; B-zone and C- <br /> zone) and is not migrating beyond the current plume limits as defined in the A-zone groundwater <br /> 08262822.dac <br /> 2033 North Main Street..Suite 340•Walnut Creek,CA 94596•Duns#14-848-7635 <br /> Tel(925)274-1100•Fax(925)274-1103•www.bbkinc.com•Offices Nationwide <br />