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[AL HELD <br /> UNITED STATES ENVIRONMENTAL PROTECTION AGENCY Y.. VICE <br /> A Region 9 <br /> 75 Hawthorne Street PM 1: 32 <br /> San Francisco CA 94105-3901 <br /> June 30, 1994 <br /> Marshall Cloud <br /> Environmental Protection Office <br /> DDRW-Tracy <br /> P.O. Box 960001 <br /> Stockton, CA 95296-0250 <br /> RE: DEFENSE DISTRIBUTION REGION WEST - TRACY, CALIFORNIA, DRAFT <br /> FINAL - WELL ABANDONMENT WORK PLAN, May 1994 <br /> Dear Marshall, <br /> The responses to EPA comments are acceptable except for the <br /> preferred location for duplicate and split samples from the <br /> agricultural wells . <br /> The comment response on page 9 of the Draft Final states that <br /> duplicate and split samples will be preferably collected from the <br /> "deeper sampling zones . " However, the text in Section B.5. 3 .4 and <br /> Table B-11 does not clarify the location of this sampling. EPA <br /> prefers that duplicate and split sampling be done in the uppermost <br /> portion of the Lower Tulare rather than the deeper portion of the <br /> Lower Tulare or any portion of the Upper Tulare. <br /> EPA believes that the final work plan should clearly state which <br /> zones are preferred for collection of duplicate and split samples. <br /> Duplicates and splits should be collected preferably from the first <br /> screened zone (s) below the Upper Tulare, presumably in or near the <br /> upper portion of the Lower Tulare. <br /> If you have any questions, please contact me at (415) 744-2392 . <br /> Sincerely, <br /> l/IM�lt�u ( Gu•-� <br /> Michael Work <br /> Federal Facilities Cleanup Office , (H-9) <br /> Hazardous Waste Management Division <br /> CC: (See Distribution List) <br />