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44 01 <br />ENVIRON MFA 'FAL I. EA LTH DEPAI.m%IENI. <br />SAN JOAQUIN COUNTY <br />304 East Weber Avenue, Third Floor <br />Stockton, California 95202-2708 <br />Telephone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />. <br />' Douala K. Heran, <br />Director <br />Al Olsen, R.E.H.S. <br />Program A.lanager <br />.aurie A. Cotulla, <br />Program Manager <br />Unit Supervisors <br />Carl Bergman, R.E.H.S. <br />Mike Huggins, R.E.H.S., R,D.1. <br />Douglas W. Wilson, <br />Margaret 1..agario, R.E.H.S. <br />Robert McClellan, R.E.I3.S. <br />Mark Barcellos,R.E.H.S. <br />GURPAI, S. SIDHIJ <br />5410 STAPLES WAY <br />LINDEN CA 95236-9556 <br />1 ieN "T":(11 14-1, <br />tir <br />RE: 3032 East Waterloo Road, Stockton <br />Site Code: 1758 <br />WORK PLAN: Interim Soil Remediation and Additional Site Assessment <br />DATED: 12 November 2004 <br />PREPARED BY: AGE <br />APPROVED: [X) <br />DISAPPROVER:, [ I <br />ADDENDUM NEEDED: [ [ Submit by: <br /> <br />ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25296.10 (c)(3)]: <br />To install 8 soil vapor extraction wells. <br />To install and operate a soil vapor extraction system to reduce contamination mass in the <br />source area. <br />To perform additional soil and groundwater sampling at three locations to determine the <br />vertical and lateral extent of contamination. <br />To Install and sample a MW to replace the upgradient MW-8 destroyed due to a land use <br />issue. <br />COMMENTS AND CONDITIONS: <br />Well pilot borings should be continuously cored to accurately determine the placement of <br />screen intervals, especially in the shallow zone finer-grained soil, to avoid penetration of <br />underlying coarse-grained soil interval. <br />The deep (180 feet logs) groundwater sampling near former CTP-2 in the identified <br />unauthorized release area is acceptable, hut the other 2 sampling locations would be more <br />beneficial if located closer to MW-5 and former CPT-4, unless AGE can offer a justification for <br />the 2 locations/points proposed. <br />The proposed location and construction details for the MW to replace MW-8 are <br />unacceptable. The proposed off-site location is approximately 200+ feet upgradient of the <br />on-site source of contamination. The distance is too far from the unauthorized release <br />location. Information obtained from the well would be more valuable if the MW was located <br />closer to the source of the release. The MW should be constructed in a more conventional <br />manner to allow for proper destruction at the end of its use, unless AGE can demonstrate an <br />adequate and acceptable destruction technique for the CMT well decommissioning. <br />DATED Li/4 BY L. <br />Harlin Knoll, Senior REHS (2091 466-3442 <br />Cc ACE-Willam I uric