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1 <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> .O <br /> Donna Heran,REHS <br /> :.A 600 East Main Street <br /> < PROGRAM COORDINATORS <br /> I 3 Stockton, California 95202-3029 Robert McClellon,REHS <br /> • Jeff Carruesco,REHS, RDI <br /> Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> Linda Turkatte,REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> January 9, 2012 <br /> Mr. Gerald L. Thiemann <br /> 327 Blossom Drive <br /> Ripon, California 95366 <br /> Subject: Former Thiemann's Service Station LOP Case No. : 0001479 <br /> 106 West Second Street <br /> Ripon, California 95366 <br /> The San Joaquin County Environmental Health Department (EHD) has received a No Further <br /> Action Required Concurrence letter from the Central Valley Regional Water Quality Control <br /> Board (CVRWQCB) dated 21 December 2011 for the above referenced site. It is now <br /> necessary to plan and execute the destruction of all wells installed as part of your site <br /> investigation and remedial action, as the EHD will not issue a Case Closure Letter for this site <br /> until the wells have been properly destroyed and all onsite waste material has been removed <br /> and properly disposed. The wells are to be destroyed within 90 days of the date of this letter, or <br /> current analytical data for groundwater collected quarterly from the wells shall be submitted for <br /> review until the wells have been properly destroyed. <br /> Please submit a scope of work proposal that details the conditions and construction of the wells <br /> and the methods and materials to be used to destroy them. To be issued a well destruction <br /> permit, the proposal must address the concerns of the EHD and the San Joaquin County Well <br /> Standards requirements, such as: <br /> • Wells that have laboratory data from the last sampling event that demonstrate the <br /> presence of any contaminants of concern are to be destroyed by removing all the <br /> contents of the well (conductor casing, well casing, screen, filter pack, grout sealant); <br /> the cleared borehole is then to be sealed with neat cement by pressure grouting from <br /> the bottom upward to a depth of three to five feet below grade. <br /> • All wells with unknown construction and/or located in an area of known or suspected <br /> area of contamination are to be destroyed by removing all the contents of the well <br /> (conductor casing, well casing, screen, filter pack, grout sealant); the cleared borehole <br /> is then to be sealed with neat cement by pressure grouting from the bottom upward to a <br /> depth of three to five feet below grade. <br /> • Wells that have laboratory data from the last sampling event that report non-detectable <br /> concentrations of contaminants of concern and with acceptable laboratory detection <br />