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Ms. Karen McLaughlin 03 March 2016 <br /> City of Manteca Page 4 of 4 <br /> Former Police Firing Range <br /> of interest addressed by this corrective action and separate it from areas not of concern in the <br /> former firing range matter. The EHD agrees with these recommendations. <br /> To address the issues and comments above, please take the following actions: <br /> • Collect sufficient soil samples from the area mapped as less impacted than TCLP > 5 mg/L <br /> and analyze for lead, antimony, arsenic and copper to better define the STLC > 5mg/L <br /> contour and refine the California hazardous waste mass estimate. <br /> • Collect and analyze sufficient soil samples from areas outside the impacted area to establish <br /> site-specific background concentrations for lead, antimony, arsenic, and copper. <br /> • Utilize sufficiently low analytical method reporting limits to determine if background <br /> concentrations naturally exceed relevant RSLs. <br /> • Evaluate the potential for the presence of polyaromatic hydrocarbons (PAHs) on the firing <br /> range floor and propose how these compounds will be addressed if present. <br /> • Provide a history of land use of the area of interest prior to use as a firing range. <br /> • Provide a legal description of the area addressed by this investigation and corrective action <br /> of the former police firing range. <br /> Following excavation of any soil as part of an approved remediation work plan, collect confirmation <br /> soil samples from sidewalls and excavation floor and analyze for all chemicals of concern with <br /> analytical method detection and reporting limits sufficiently low to demonstrate post remediation <br /> residual soils meet relevant RSLs or other agreed upon cleanup goals. Please submit a work plan <br /> to the EHD to address the concerns noted above. <br /> The EHD notes that all characterization, handling, treatment and disposal of soil potentially <br /> impacted by the metals of concern addressed by this investigation and cleanup must comply with all <br /> relevant provisions of Title 22 California Code of Regulations and Title 40 Code of Federal <br /> Regulations. <br /> Comments and questions regarding this letter should be directed to Nuel Henderson at (209) 468- <br /> 3436 or by email at nhendersonna.sicehd.com. <br /> Sincerely, <br /> Nuel C. Henderson, Jr., PG <br /> Engineering Geologist <br /> CC: Nabaz Saieed, TY Lin Inc., 2010 Crow Canyon Pl., Ste. 350, San Ramon, CA 94583 <br /> Richard Day, Geocon Consultants, Inc., 6671 Brisa St., Livermore, CA 94550-2505 <br /> Leona Winner, DTSC, 8800 Cal Center Dr., Sacramento, CA 95826 <br /> Steven Meeks, CVRWQCB, 11020 Sun Center Dr., Ste 200, Rancho Cordova, CA 95670 <br />