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J�tEO Sure • • <br /> s UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br /> + REGION IX <br /> 75 Hawthorne Street <br /> San Francisco, CA 94105.3901 <br /> RECEIVED <br /> April 12, 1993 APR 16 1993 <br /> Marshall Cloud ENVIRONMENTAL HEALTH <br /> Superfund Project Manager, DDRW-Tracy PERMIT/SERVICES <br /> Env-Protection Office, Bldg. 108 <br /> P.O. Box 960001 <br /> Stockton, CA 95296-0250 <br /> RE: Draft Amendment to DDRW-Tracy Comprehensive RI/FS Work Plan <br /> Thank you for the Draft Work Plan Amendments for the Phase I Remedial <br /> Investigation (RI) including the baseline risk assessment (BRA) amended portions to <br /> accompany the Comprehensive Remedial Investigation/Feasibility Study (RI/FS). These <br /> draft work plan amendments were received in our offices on February 12, 1993. Per the <br /> terms of the FFA, we are providing comments (attached) within 60 days of receipt of the <br /> primary document. <br /> EPA's major concerns are that the Work Plan Amendment: (1) should clarify the <br /> objectives of Phase I sampling, (2) describe in greater detail the specific plans to establish <br /> background levels for metals and pesticides, (3) appears to question the representativeness <br /> of the total metals data, yet does not articulate a proposed corrective action, and (4) should <br /> provide more definitive plans for the Baseline Risk Assessment. <br /> Should you have any questions, please contact me at (415) 744-2392. <br /> Sincerely, <br /> V1Jq 1 <br /> Michael Work <br /> Federal Enforcement Section I (H-9-1) <br /> Office of Superfund <br /> Attachment <br /> cc: (See Distribution List) <br /> Punted an Rerrr(ed Paper <br />