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{ <br /> San Joaquin County <br /> Environmental Health Department <br /> o?' "" • c DIRECTOR <br /> G Linda Turkalte,REHS <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> • Jeff Carruesco,REHS,RDI <br /> C4�IF o.��j�P Website:www.sjgov.org/ehd Kasey Foley,REHS <br /> Phone: (209)468-3420 Adrienne Ellsaesser,REHS <br /> Rodney Estrada,REHS <br /> Fax: (209)464-0138 Willy Ng,REHS <br /> March 3, 2016 <br /> City of Manteca <br /> Attn: Karen McLaughlin, City Manager <br /> 1001 W. Center Street <br /> Manteca, CA 95337 <br /> Subject: Site Investigation Report Comment Letter <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 Site <br /> Investigation Report, Former Police Firing Range, Manteca, California (SIR), dated 14 October <br /> 2015, prepared by your consultant Geocon Consultants, Inc. (GCI). In SIR, GCI documents the <br /> scope of work performed to investigate the extent of soil and groundwater impacted by the historical <br /> use of the site as a police firing range, including the methodologies employed, the distribution and <br /> density of soil and groundwater sampling, the laboratory methods utilized, the analytical results, the <br /> methods of data analysis, the resulting waste characterizations of impacted soil, conclusions of the <br /> investigation and estimated remediation costs. <br /> The site was characterized by: <br /> • Advancing three direct push soil borings on the firing range floor to ten feet below surface <br /> grade (bsg) to collect soil samples and then as deep as 25 feet bsg to collect grab <br /> groundwater samples <br /> • Excavating seven trenches in the primary impact and side berms, <br /> • Screening surface soil and trench walls with a Minelab Explorer SE metal detector and an <br /> Innov-X Alpha 2000 X-Ray Fluorescence (XRF) device for lead, <br /> • Collecting 30 soil samples for laboratory analysis for total lead or Title 22 metals and <br /> selected samples for soluble lead. <br /> Soil sampling occurred in areas identified as being potentially impacted by lead during the site <br /> screening process utilizing the metal detector and XRF device. Sample locations were recorded in <br /> the field using a handheld Trimble GPS unit with submeter accuracy. The XRF readings were <br /> recorded in milligrams per kilogram (mg/kg). The metal detection findings (i.e., presence or absence <br /> of lead shot) were reported as described on the daily field log. <br /> Surface soil samples were collected from the range floor, primary impact berm, and side berms, and <br /> deeper soil samples were collected from the three borings advanced on the range floor to assess <br /> the vertical extent of impacted soil; groundwater samples were also collected from the borings to <br /> assess the impact on groundwater. The penetration depth of lead in soil comprising the berm was <br />