WORK PLANS - Laserfiche WebLink

Home Browse Search

Ms. Elena Reyes, City Manager January 10, 2017 City of Manteca Page 3 of 3 Former Police Firing Range The EHD is concerned with the identification and delineation of soil impacted at low concentrations of lead exceeding the cleanup goal of 80 mg/kg that was not addressed in the SREW, as noted in the EHD letter of 03 March 2016. Geocon, based on prior experience, utilized an XRF reading of 50 mg/kg as the breakpoint for soil to be excavated or left in place. However, without a demonstrable correlation between XRF and total lead data, the EHD requires that the confirmation sampling density outside the excavated area be one sample per 25-foot by 25-foot square immediately adjacent to the excavation area and one sample per 50-foot by 50-foot square over the remainder of the firing range area included in the legal description. The EHD will consider the cleanup goal achieved if the total lead data also demonstrates that soil exceeding 80 mg/kg total lead and the other COPC RSLs has been removed. In addition, because of the uncertainty associated with the screening samples in and around the berm areas, the EHD does not recommend using this soil as backfill for the finished excavation. Should this soil be used as backfill, sufficient total lead analytical data showing compliance with the appropriate RSLs must be demonstrated before being utilized as backfill in the excavation. The EHD approves the SREW with the condition that the modifications required by the EHD, as noted above, are fully implemented with the proposed actions. The EHD notes that all characterization, handling, treatment and disposal of soil potentially impacted by the metals of concern addressed by this investigation and cleanup must comply with all relevant provisions of Title 22 California Code of Regulations and Title 40 Code of Federal Regulations. The EHD will issue a certificate of completion pursuant to California Health and Safety Code Section 101480(e) upon demonstration that all cleanup goals established to protect human health for the proposed land use have been met, assuming no other environmental concerns are discovered during the course of this cleanup action. Please be advised that a certificate of completion issued by the EHD under the voluntary program only covers the scope of work as noted in the Local Voluntary Cleanup Program Remedial Action Agreement and does not constitute a 'closure" or "no further action" designation under any other authority or program, or on behalf of any other agency. Comments and questions regarding this letter should be directed to Nuel Henderson at (209) 468-3436 or by email at nhenderson(vDsicehd.com. Sincerely, / Nuel C. Henderson, Jr., PG Engineering Geologist CC: Nabaz Saieed, TY Lin Inc., 2010 Crow Canyon PI., Ste. 350, San Ramon, CA 94583 Richard Day, Geocon Consultants, Inc., 6671 Brisa St., Livermore, CA 94550-2505 Gregory Dickinson, Pacific Edge, 26431 Crown Valley Parkway, Ste 270, Mission Viejo, CA Leona Winner, DTSC, 8800 Cal Center Dr., Sacramento, CA 95826 Steven Meeks, CVRWQCB, 11020 Sun Center Dr., Ste 200, Rancho Cordova, CA 95670 (All distributed by email)