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6 q <br /> San Joaquin County <br /> °�'" Environmental Health Department DIRECTOR <br /> o?' ' "' c p Donna Heron,REHS <br /> o <br /> 2: 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco, REHS, RDI <br /> - ;.� Kasey Foley,REHS <br /> cq.. -,a P Website: www.sigov.org/ehd Linda Turkatte, REHS <br /> �iFOR Phone: (209)468-3420 Rodney Estrada, REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser,REHS <br /> June 13, 2013 <br /> Chevron Environmental Management <br /> c/o Brian Waite <br /> lg(t 1 -610-i--Bollinger Canyon Road BRIX-5321 <br /> San Ramon, CA 94583 <br /> Subject: Former Unocal <br /> 437 East Miner Avenue <br /> Stockton, CA 95202 <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 June 5, 2013, for the above subject site. It is now necessary to plan <br /> the destruction of all wells installed as part of your site investigation and remedial action, as the <br /> EHD will not issue a Case Closure Letter for this site until the wells have been properly <br /> destroyed and all onsite waste material have been removed and properly disposed of. The <br /> wells are to be destroyed within 90 days of the date of this letter. <br /> Please submit a work plan that details the conditions and construction of the wells and the <br /> methods and materials to be used to destroy them. To be issued a well destruction permit the <br /> proposal must comply with the San Joaquin County Well Standards requirements, including: <br /> • Wells that have laboratory data from the last groundwater sampling event that <br /> demonstrate the presence of any contaminants of concern are to be destroyed by <br /> removing all the contents of the original borehole (conductor casing, well casing, screen, <br /> filter pack, grout sealant); the cleared borehole is then to be sealed with neat cement by <br /> grouting from the bottom up to a depth of three feet below grade. <br /> • All wells with unknown construction and/or located in an area of known contamination <br /> are to be destroyed by removing all the contents of the original borehole as described <br /> above; the cleared borehole is then to be sealed with neat cement by grouting from the <br /> bottom up to a depth of three feet below grade. <br /> • Wells that have laboratory data from the last sampling event that report non-detectable <br /> concentrations of contaminants of concern, with acceptable laboratory detection limits, <br /> may be destroyed by pressure grouting with neat cement from the bottom up while <br /> leaving the well casing in place. Following that, a hole at least one foot larger in <br /> diameter than the originally drilled borehole shall be excavated around the outside of the <br /> well casing to a depth of 3 feet below the ground surface, and the well casing shall then <br />