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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> F' Donna Heran,REHS <br /> _ 1868 East Hazelton Avenue <br /> a; <br /> .A PROGRAM COORDINATORS <br /> N: Y :< Stockton, California 95205-6232 Robert McClellon,REHS <br /> :. Jeff Carruesco, RENS,RDI <br /> ' Kasey Foley,REHS <br /> Website: www sjgov.org/ehd Linda Turkatte,REHS <br /> QL,Fo�� Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> ULTRAMAR, INC. <br /> ATTN: ROGER LEVIN <br /> 5590 B HAVANA STREET <br /> DENVER, CO 80239 <br /> RE: 2255 S. Airport Way Site Code: 0001335 <br /> Stockton, CA 95206 <br /> WORK PLAN: Work Plan 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)]: <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 /> DATED BY <br /> Harlin Knoll, Senior REHS (209) 468-3442 <br /> Cc: Horizon Environmental, 4970 Windplay Drive, #C5, EI Dorado Hills, CA 95762 <br />