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San Joaquin County <br /> " '•� Environmental Health Department DIRECTOR <br /> 1868 East Hazelton Avenue Linda Turkatte, REHS <br /> U). # :{ <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon, REHS <br /> Jeff Carruesco, REHS, RDI <br /> Cq`r ci�P Website: www.sjgov.org/ehd Kasey Foley, REHS <br /> FOR Rodney Estrada, REHS <br /> Phone: (209) 468-3420 Adrienne Ellsaesser, REHS <br /> Fax: (209) 464-0138 <br /> April 9, 2015 <br /> Carl Knowles <br /> PO Box 640 <br /> Woodbridge, CA 95258 <br /> Subject: Request for Closure—Closure Concurrence Site Code: 1124 <br /> 1140 West Hammer Lane (a.k.a. 7835 Thornton Rd.) <br /> Stockton, CA 95209 <br /> By letter dated March 12, 2015, the San Joaquin County Environmental Health Department <br /> (EHD) denied the request for case closure review included in Fourth Quarter 2014 Groundwater <br /> Monitoring and Remediation Status Report and Request for Environmental Case Closure <br /> Review (GWMR 1) dated January 28, 2015, prepared and submitted by Stratus Environmental, <br /> Inc. (Stratus). Since then, the EHD has reviewed First Quarter 2015 Groundwater Monitoring <br /> and Remediation Status Report (GWMR 2) dated April 3, 2015, prepared and submitted by <br /> Stratus, and has discussed the site with Central Valley Regional Water Quality Control Board <br /> staff. <br /> After review of analytical data presented from GWMR 2 and further review of site conditions and <br /> the case closure criteria established under the Low-Threat Underground Storage Tank Case <br /> Closure Policy, the EHD considers the site eligible for case closure. According to GWMR 2, <br /> benzene concentrations decreased below 1,000 micrograms per liter (pg/1) in groundwater <br /> monitored by MW-12. In addition, a 30-foot bioattenuation zone exists at the subject site; <br /> therefore, vapor intrusion poses a minimal threat. <br /> The EHD directs the following: discontinuation of groundwater monitoring; discontinuation of <br /> ozone injection remediation; submittal of the estimated time to reach water quality goals (WQG) <br /> and initial and removed contaminate mass estimates; preparation of a well destruction work <br /> plan; and preparation of a public participation notice regarding the pending case closure. Prior <br /> to the destruction of wells associated with this case, a 60-day public notification period must be <br /> conducted. As required by the Low-Threat Underground Storage Tank Case Closure Policy <br /> (LTCP) enacted by the State Water Resources Control Board (State Water Board) on 17 August <br /> 2012, `Municipal and county water districts, water replenishment districts, special act districts <br /> with groundwater management authority, agencies with authority to issue building permits for <br /> land affected by the petroleum release, owners and occupants of the property impacted by the <br /> petroleum release, and the owners and occupants of all parcels adjacent to the impacted <br /> property shall be notified of the proposed case closure and provided a 60-day period to <br /> comment." Those to be notified include, but are not limited to: California Water Service <br /> Company in Stockton, Stockton East Water District, San Joaquin County Public Works Utilities <br /> Maintenance, Stockton Municipal Utilities Department, Stockton Community Development <br /> Department and Stockton Public Works Department. <br />