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San Joaquin County <br />Environmental Health Department <br />1868 East Hazelton Avenue <br />Stockton, California 95205-6232 <br />ULTRAMAR, INC. <br />ATTN: ROGER LEVIN <br />5590 B HAVANA STREET <br />DENVER, CO 80239 <br />RE: 2255 S. Airport Way <br />Stockton, CA 95206 <br />Website: www.sjgov.org/ehd <br />Phone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />DIRECTOR <br />Donna Heran, REHS <br />PROGRAM COORDINATORS <br />Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Kasey Foley, REHS <br />Linda Turkaite, REHS <br />Site Code: 0001335 <br />WORK PLAN: Work Pian for DPE Well Installation and Soil Gas Investigation <br />DATED: May 5, 2012 <br />PREPARED BY: Horizon Environmental Inc. <br />APPROVED: [X] <br />ADEQUATE AND NECESSARY ELEMENTS OF THE WORK PLAN [H&S 25296.10 (c)(3)1: <br />1. To destroy MW -1 by over -boring to a total depth of 56 feet bgs and plugging the boring <br />with neat cement. <br />2. To install a replacement well with 4 inch PVC casing in a 10 inch diameter bore hole <br />with a total depth of 60 feet bgs and a screened interval from 30 feet to 60 feet bgs. <br />The well will be use for ground water monitoring initially and for Dual Phase Extraction <br />(DPE) if necessary. <br />3. To develop and sample the well for chemicals of concern. <br />4. To perform a soil gas investigation collecting soil gas samples from 5 feet bgs from 4 <br />separate on-site locations following the California Department of Toxic Substance <br />Control Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to <br />Indoor Air -Interim Final and the California Environmental Protection Agency Advisory - <br />Active Soil Gas Investigation along with current Agency advisories and guidance. <br />5. To plug all soil borings with neat cement after soil gas samples have been collected. <br />COMMENTS AND CONDITIONS: <br />1. To prepare and submit a report summarizing the well destruction, the well installation, <br />the soil gas evaluation, and ground water evaluation along with comments and <br />recommendations to the EHD, the CVRWQCB, and GeoTracker within 90 day of the <br />completion of the related work. <br />I.)- BY L-_� <br />Harlin Knoll Senior REHS (209) 468-3442 <br />Cc: Horizon Environmental, 4970 Windplay Drive, #C5, EI Dorado Hills, CA 95762 <br />