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v <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> Q: < Stockton, California 95205-6232 Robert McClellon,REHS <br /> . ` Jeff Carruesco,REHS,RDI <br /> PKasey Foley,REHS <br /> • �q Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> tiFOR Phone: (209) 468-3420 <br /> Fax: (209) 464-0138 <br /> September 5, 2012 <br /> Gabe Karam, Director <br /> County Facilities Management <br /> 44 N. San Joaquin Street <br /> Stockton, CA 95202 <br /> Subject: San Joaquin County Human Services <br /> 145 S Sutter Street <br /> Stockton, CA 95202 <br /> LOP Site: 1257 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Low Risk <br /> Closure Request Report (the Report), dated May 2012, submitted on your behalf by Weston <br /> Solutions. In the Report, Weston Solutions recommends that this site be considered for Low <br /> Risk Closure. In order for the EHD to give further consideration for this request the following <br /> concerns should be addressed: <br /> 1) Demonstrate the down-gradient extent of impacted groundwater from MW-2, the most <br /> impacted monitoring well. <br /> 2) Provide estimates of residual dissolved and sorbed contaminant masses. <br /> 3) Provide an estimate of the time required for dissolved contaminant concentrations to <br /> achieve background conditions of groundwater. <br /> 4) Provide a demonstration that the secondary source in the area of MW-2 has been <br /> remediated to the extent practicable. <br /> 5) Completion of the conceptual site model (CSM) with plume map and description of <br /> plume disposition and behavior. <br /> 6) If site qualifies for Low Threat Closure Policy criteria, demonstrate how each of the <br /> criteria is met. <br /> If you have any questions please call Lisa Medina at (209) 468-3455. <br /> Sincerely, <br /> Lisa Medina, REHS_ Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive, Suite 200, Rancho Cordova, CA 95670 <br /> Weston Solutions, 1575 Trout Blvd. Suite 212, Walnut Creek, CA 94598 <br />