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��ED 9i„FS • • <br /> UNITED STATES ENVIRONMENTAL PROTECTION AGENCY <br /> 4,p,ptE REGION IX <br /> 75 Hawthorne Street <br /> San Francisco, Ca. 94105-3901 <br /> December 19, 1991 <br /> Marshall Cloud <br /> Superfund Project Manager <br /> Environmental Protection Office <br /> Bldg. 231, Tracy Location IiIo 1 , ,ffiAW <br /> Defense Distribution Region West DEC 2 3 tm31 <br /> PO Box. 96001 <br /> Stockton, CA 95296-0250 ENVIRONMENTALHFAL1H <br /> PERMIT/5ERVICrS <br /> RE: DDRW-Tracy Draft Quarterly Monitoring Report (August 1991) <br /> Dear Mr. Cloud: <br /> Attached are EPA' s comments on the Draft Quarterly <br /> Monitoring Report of the August 1991 Sampling Round for the Well <br /> Monitoring Program at DDRW-Tracy (received in our offices on <br /> 11/12/91) . Our comments are attached. <br /> EPA's major concerns include (1) the extent and routes of <br /> migration both horizontally and vertically in the groundwater, <br /> (2) the level of metals (specifically lead) in the groundwater, <br /> (3) the lack of an established background level for the metals, <br /> and (4) the method detection limits that sometimes do not meet <br /> the stringent State of California and EPA standards. Per our <br /> meeting of 12/16/91, EPA recommends that DDRW-Tracy continue in <br /> its efferts to establish acceptable background concentrations for <br /> inclusion in the Draft Remedial Investigation (RI) Report for <br /> Operable Unit No. 1 that is due on February 16, 1992 . <br /> Please contact me at (415) 744-2392 should you have any <br /> questions. <br /> Sincerely, <br /> C44AtJI4..C,r (-4J <br /> Michael Work <br /> Remedial Project Manager <br /> Federal Enforcement Section I (H-9-1) <br /> Federal Facilities Enforcement Branch <br /> Office of Superfund <br /> Attachment <br /> cc: (see distribution list) <br /> Printed on Recycled Paper <br />