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'1 <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> .O Donna Heran,REHS <br /> `i 600 East Main Street <br /> W: I 1 PROGRAM COORDINATORS <br /> .,. Stockton, California 95202-3029 Robert McClellon,REHS <br /> Jeff Carruesoo,RENS,RDI <br /> Kasey <br /> Linda <br /> T <br /> Website: www.sjgov.org/ehd Loiey,RE <br /> HS Foa Phone: (209)468-3420 Linda urkatte,REE <br /> HS <br /> Fax: (209)464-0138 <br /> January 23, 2012 <br /> Mr. Eric Hetrick Hardev &Amarjit Khinda Etal <br /> ConocoPhillips 27000 S. Leeward <br /> 76 Broadway Tracy, CA 95304 <br /> Sacramento, CA 95812 <br /> Subject: Circle K/Service Station#01205 RO#: 0138 <br /> 16470 Cambridge Drive AP#: 196-430-32 <br /> Lathrop, CA 95330 Global ID#: T0607700822 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Revised <br /> Wnrk Plan for Well Abandonment and Replacement (Plan) dated January 3, 2012 that <br /> v .s submnted by Blaes Environmental Management, Inc. <br /> The Plan was submitted in response to the EHD's requirement to replace monitoring wells <br /> MW-1 and MW-2 that were damaged during the underground storage tank (UST) removal <br /> December 20, 2011. In addition, unstable and crumbling UST excavation dirt walls did not <br /> Flow for the safe collection of required soils samples below the USTs. The Pian includes <br /> a proposal to collect the three required sidewall soil samples to complete the UST removal <br /> procedures and also provides for the removal of damaged MW-1 and MW-2 and the <br /> installation of replacement monitoring wells, MW-1 R and MW-2R. <br /> The Plan proposes drilling out and removing damaged monitoring wells MW-1 and MW- <br /> and replacing them by installing MW-IR and MW-2R in close proximity to each. Since <br /> these two new wells will be in the area soil samples are required to complete the UST <br /> removal plan, the Plan proposes that two initial monitoring well boreholes will be sampled <br /> a 9 (feet), 14', and 25' be,ow around surface (bgs) before proceeding to construct MW- <br /> 1f and MW-2R. The EHD UST-Unit III has advised that only a 14.5' to 15.0' bgs soil <br /> sample is required. The EHD Unit IV remediation unit (LOP) concurs. <br /> After two of the UST soil samples have been collected, one additional soil boring will be <br /> a-iv3nced along the northern edge of the former US-1 excavation to collect the last <br /> required soil sample. No monitoring well is proposed to be installed in this hole. Please <br /> ensure that the soil sample from this northern UST boring is collected from 14.5' to 15.0' <br /> bgs also. <br /> The procedures included in the Plan for the well destructions, new well installations, and <br /> soil sampling procedures are adequate and necessary and approved. (Health and Safety <br /> Code, 25296.10(c)(3)j <br />