SITE INFORMATION AND CORRESPONDENCE FILE 2

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r San Joaquin County r oP` "" Environmental Health Department DIRECTOR Donna Heran, REHS 600 East Main Street C Stockton California 95202-3029 PROGRAM COORDINATORS � Robert McClellon,REHS - - — Jeff Carruesco,REHS,RDI Website: www.sjgov.org/ehd Kasey Foley, REHS 4 v o R d Phone: (209) 468-3420 Linda Turkatte,REHS Fax: (209) 464-0138 January 23, 2012 Mr. Eric Hetrick Hardev & Amarjit Khinda Etal ConocoPhillips 27000 S. Leeward 76 Broadway Tracy, CA 95304 Sacramento, CA 95812 Subject: Circle K / Service Station #01205 RO#: 0138 16470 Cambridge Drive AP#: 196-430-32 Lathrop, CA 95330 Global ID#: T0607700822 The San Joaquin County Environmental Health Department (EHD) has reviewed Revised Work Plan for Well Abandonment and Replacement, (Plan) dated January 3, 2012 that was submitted by Blaes Environmental Management, Inc. The Plan was submitted in response to the EHD's requirement to replace monitoring wells MW-1 and MW-2 that were damaged during the underground storage tank (UST) removal December 20, 2011. In addition, unstable and crumbling UST excavation dirt walls did not allow for the safe collection of required soils samples below the USTs. The Plan includes a proposal to collect the three required sidewall soil samples to complete the UST removal procedures and also provides for the removal of damaged MW-1 and MW-2 and the installation of replacement monitoring wells, MW-1 R and MW-2R. The Plan proposes drilling out and removing damaged monitoring wells MW-1 and MW- and replacing them by installing MW-1R and MW-2R in close proximity to each. Since these two new wells will be in the area soil samples are required to complete the UST removal plan, the Plan proposes that two initial monitoring well boreholes will be sampled at 9' (feet), 14', and 25' below ground surface (bgs) before proceeding to construct MW- 1R and MW-2R. The EHD UST-Unit III has advised that only a 14.5' to 15.0' bgs soil sample is required. The EHD Unit IV remediation unit (LOP) concurs. After two of the UST soil samples have been collected, one additional soil boring will be advanced along the northern edge of the former UST excavation to collect the last required soil sample. No monitoring well is proposed to be installed in this hole. Please ensure that the soil sample from this northern UST boring is collected from 14.5' to 15.0' bgs also. The procedures included in the Plan for the well destructions, new well installations, and soil sampling procedures are adequate and necessary and approved. [Health and Safety Code, 25296.10(c)(3)]