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DIRECTOR <br /> San Joaquin County Linda Turkatte,REHS <br /> 'oPqu IN o0 <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> _• y <br /> .-� 1868 E Hazelton Avenue Kasey Foley,REHS <br /> m { <br /> Stockton, California 95205 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> • �, `p • Jeff Carruesco,REHS,RDI <br /> 4</PORN Website: www.sjcehd.com Rodney Estrada,REHS <br /> Phone: (209)468-3420 Willy Ng,REHS <br /> Fax: (209)464-0138 Muniappa Naidu,REHS <br /> January 10, 2017 <br /> City of Manteca <br /> Attn: Elena Reyes, City Manager <br /> 1001 W. Center Street <br /> Manteca, CA 95337 <br /> Subject: Soil Remedial Excavation Work Plan (SREW)Approval 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 Soil <br /> Remedial Excavation Work Plan, Former Police Firing Range, Manteca, California (SREW), dated <br /> December 2016, prepared by Pacific Edge Engineering, Inc. (Pacific Edge) for Innovative <br /> Construction Solutions (ICS) on your behalf. In addition, the EHD met with a representative of <br /> Geocom Consultants, Mr. Richard Day, to discuss modifications to the previous work plan, Remedial <br /> Action Plan, Former Police Firing Range, Manteca, California (RAP), dated August 2016, also <br /> prepared by Pacific Edge, to limit its scope to those actions specified in California Health and Safety <br /> Code Section 101480 under which the EHD can provide regulatory oversight. <br /> The SREW addresses shallow soil impacted by various metals as described below. Groundwater as <br /> characterized by three grab groundwater samples collected in the initial investigation was not <br /> impacted by any COPCs above their respective California Maximum Contaminant Level (MCL). <br /> In the SREW, Pacific Edge stated the goal of the proposed removal action is to place the Site in a <br /> condition that allows it to be permanently used for its planned use without any significant risk to human <br /> health or any significant potential for future environmental damage. The removal action proposed for <br /> the site includes excavation and offsite disposal of soil with chemicals of potential concern (COPCs) <br /> concentrations that exceed proposed cleanup goals. The cleanup goals proposed are the United <br /> States Environmental Protection Agency (EPA) Regional Screening Levels (RSLs), which are risk- <br /> based screening levels protective of human health, but that for lead is the California Human Health <br /> Screening Level (CHHSL). <br /> Based on the Geocon report Site Investigation Report, Former Police Firing Range, Manteca, <br /> California, (SIR) dated October 2015, Pacific Edge identified the following COPCs impacting shallow <br /> soil and proposed cleanup goals, in milligrams per kilogram (mg/kg) for each: antimony — 31 mg/kg; <br /> copper - 3,100 mg/kg; lead — 80 mg/kg; tin — 47,000 mg/kg; and zinc — 23,000 mg/kg. With the <br /> exception of lead and possibly arsenic, none of the other metals are thought to be present at <br /> concentrations that exceed their respective RSL. As the previous agricultural land use and natural <br /> background arsenic concentrations may cause arsenic concentrations to exceed its RSL of 0.67 <br /> mg/kg, Pacific Edge proposes to utilize the screening concentration of 12 milligrams per kilogram <br /> (mg/kg) used in the Schools Program by the California Department of Toxic Substances Control <br />