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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REBS <br /> Jeff Carruesco,REHS,RDI <br /> Kasey <br /> Website: www.sjgov.org/ehd Linda Foley, REHS <br /> o Phone: (209) 468-3420 Linda Turkatte,REHS <br /> Fax: (209) 464-0138 <br /> December 8, 2011 <br /> Thrifty Oil Company <br /> Mr. Chris Panaitescu <br /> 13116 Imperial Highway <br /> Santa Fe Springs, CA 90670 <br /> Subject: Thrifty Gas Station #171 LOP Case#: 1299 <br /> 1250 North Wilson Way APN: 117-310-01 <br /> Stockton, CA 95205 Geotracker ID#: T0607700132 <br /> The San Joaquin County Environmental Health Department (EHD) has received a <br /> Concurrence to No Further Action Request letter from the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) dated December 2, 2011. The site is now qualified to <br /> apply for monitoring/remediation well removal. Please submit an EHD Master File Record <br /> Form (MFR) and a Well and Boring Permit Application form that details the methods and <br /> materials to be used to destroy the wells, which addresses the following well destruction <br /> concerns and requirements of the EHD: <br /> • Wells that have laboratory data as of the last sampling event that found contaminants <br /> present or are in the area of residual contamination are to be destroyed by removing <br /> the contents of the well (PVC, sand, bentonite). The cleared borehole is to be sealed <br /> with neat cement by grouting from the bottom up, to five feet below grade. <br /> Contaminated wells may also be wire-line destroyed. (exploded in place) Please <br /> contact Mr. Michael Infurna for details on this procedure. The EHD has reviewed the <br /> data for the wells at this site and has determined that wells, TB-6, TB-7, TB-9, TB-11, <br /> VW-5, EW-5S, and EW-5D were either contaminated at the last reported sampling <br /> event or are in the area of residual contamination. These wells do not qualify for <br /> pressure grouting and must have the contents removed. For single cased wells that <br /> are to have the contents removed and your plan includes over-boring the wells, please <br /> plan on using the same auger diameter as used for installation. Triple nested wells <br /> proposed for over-bore (TB-9 and TB-11) must use an auger of an adequate size that <br /> when centered on the deepest casing, is capable of reaching the outside most radius <br /> of the original borehole. <br /> • Wells that were found at their last sampling event to be non-detect for contaminants, <br /> with acceptable detection limits, may be destroyed by pressure grouting with the well <br /> casing left in place. The top five feet of the well shall be drilled out with the same size <br /> auger as originally installed, and the top of the well sealed in a mushroom cap with at <br /> least 18 inches of neat cement grout over it after the pressurized grout has stabilized. <br />