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San Joaquin County <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202-3029 <br />Website: www.sjgov.org/ehd <br />Phone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />DIRECTOR <br />Donna Heran, REHS <br />ASSISTANT DIRECTOR <br />Laurie Cotulla, REHS <br />PROGRAM COORDINATORS <br />Carl Borgman, REHS <br />Mike Huggins, REHS, RDI <br />Margaret Lagorio, REHS <br />Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Kasey Foley, REHS <br />GURPAL S. SIDHU <br />5410 STAPLES WAY <br />LINDEN CA 95236-9556 <br />RE: 3032 East Waterloo Road, Stockton Site Code: 1758 <br />WORK PLAN: Interim Remediation Addendum and Site Assessment <br />DATED: 23 May 2007 <br /> <br />PREPARED BY: AGE <br />APPROVED: [X] <br />DISAPPROVED: <br />ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25296.10 (c)(3)]: <br />To install 4 additional shallow on-site groundwater extraction wells to improve the removal and reduce <br />the migration of contaminated groundwater down-gradient of the source area. <br />To install and monitor one deep on-site MW down-gradient of and near the identified source area. The <br />MW will be installed with a screen from approximately 175 feet to 185 feet BGS in previously <br />identified HU6 (water bearing unit E). <br />To install 12 off-site MWs at four locations to monitor the lateral and the vertical groundwater <br />contamination migrating from the site. <br />To install 4 Twin CPTs in the previously identified groundwater down-gradient direction to define the <br />extent of MTBE migration. <br />COMMENTS AND CONDITIONS: <br />1. EHD has not received permits applications, access agreements, or fees for any of the approved <br />off-site work. Please refer to the 21 May 2007 EHD directive letter for guidance and required deadlines. <br />DATED <br /> By WA <br />Harlin Knoll, Senior REHS (209) 468-3442 <br />.\ (;K/Williarn