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San Joaquin County <br /> Environmental Health De artment DIRECTOR <br /> Pp u N (] Linda Turkatte,REHS <br /> '�—"Ag-5-- c°c 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> N <br /> %,A Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> P" Kasey Foley,REHS <br /> Website: www.sjgov.org/ehd Rodney Estrada,REHS <br /> �r FOR Phone: (209)468-3420 Adrienne Ellsaesser,REHS <br /> Fax: (209)464-0138 <br /> September 10, 2015 <br /> City of Manteca �O o <br /> Attn: Karen McLaughlin, City Manager <br /> 1001 W. Center Street <br /> Manteca, CA 95337 <br /> Subject: Approval of Revised Work Plan for Soil and Groundwater Investigation <br /> Former City of Manteca Police Firing Range <br /> 2516 W. Yosemite Avenue <br /> Manteca, CA 95336 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> t Workplan for Soil and Groundwater Investigation (initial WP), dated 28 July 2015, and Revised <br /> Workplan for Soil and Groundwater Investigation (revised WP), dated 26 August 2015, both <br /> prepared by your consultant Geocon Consultants, Inc. (GCI). The initial WP was revised to <br /> incorporate suggestions made by Ms. Leona Winner of the California Department of Toxic <br /> Substances Control (DTSC). In addition, Geocon responded by email to various recommendations <br /> and questions from the EHD regarding the impending investigation. The EHD has determined that <br /> the revised WP and responses by email to EHD concerns and questions provide an adequate basis <br /> for the initial site investigation and addresses the comments and questions raised by the DTSC. <br /> The EHD therefore approves the WP as amended in the revised WP and detailed by email dated 10 <br /> September 2015. <br /> The proposed scope of work includes initially screening the potentially affected areas of the former <br /> range utilizing a hand-held metal detector (Minelab Explorer SE with 5, 8, and 12 inch coils and <br /> Sunray integral pinpointer; and/or a Fischer F75 with Sunray probe.), followed by a portable X-ray <br /> fluorescence devise to identify areas of potential concern for soil sampling. The apparently <br /> impacted XRF and metal detection locations will be recorded in the field using a handheld Trimble <br /> GPS unit with submeter accuracy. The XRF readings will be recorded in mg/kg. The metal detection <br /> findings (i.e., presence or absence of lead shot) will be described on the daily field log. <br /> Surface soil samples from within the apparently impacted area(s) will be collected for total lead and <br /> CAM 17 metals analysis and surface soil samples from outside of this area will also be collected to <br /> confirm the metal detections and XRF findings. Within the range floor, hand tools (e.g., shovel) <br /> along the screening devices, will be utilized to determine the depth of lead impacts. Soil samples <br /> will be collected at various depths that exhibit elevated screening concentrations the process will be <br /> continued until no lead impacts are noted and confirmation samples will be collected for total lead <br /> analysis. The samples that have no apparent lead impact will be inferred to be representative of <br /> background concentrations. <br /> Soil sampling will occur in areas identified as being potentially impacted by lead during the site <br /> screening process. Soil samples will be collected from the range floor, primary impact berm, and <br />