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CHAPIN BRO �S . , INC . <br /> 1203 N. Carlton Avenue Stockton', California 95203 <br /> Home: (209) 464-4349 Pager: (209) 775-02275 <br /> Fax (209)464-6947 <br /> l L� 61 <br /> AUG 21 J ?005 <br /> ENVIRONMENT HEALTH <br /> qP R��,FPT`SERV!CES <br /> August 27, 2006 <br /> Advanced GeoEnviornmental, Inc. <br /> 837 Shaw Rd. <br /> Stockton, Ca. 95215 <br /> Ref: Proposal for Work Plan No. 04-2820 <br /> Attn. Robert Marty <br /> Following our review of your June 15 2006 proposal for a limited Soil Gas investigation <br /> and collection of Ground Water Samples we have determined this proposal is not <br /> acceptable and needs expanding the scope of work proposed. <br /> Considering the ongoing monitoring and reporting of the site conditions as required the <br /> conclusion of this review will result in a denial of the petition for a low risk closure of <br /> the site or another course of action. Foremost of our concern at this time is the additional <br /> criteria required by the C.V.R.W. Q.C.B.for closure consideration <br /> Comparison of site data required with ESLs and CHHSL s of the San <br /> Francisco Bay Regional Water Quality Board with a iustification for containment <br /> levels that exceed the ESLs and CHHSLs <br /> An evaluation of the potential vapor intrusion into occupied buildings in the <br /> area, especially the adiacent residential structures. <br /> We do not believe the proposed work plan has satisfied criteria and health risk <br /> assessment such as contaminants remaining,the existing water supply wells and <br /> consideration be given that the plume is stable and sufficiently limited to lateral and <br /> vertical extent <br /> A more detailed proposal should include for consideration item ; <br /> 1 Up-date Vapor Extraction System <br /> 2 New extraction wells at various depth <br />