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rCalifornia Redonal Water Oualitv Control Board' X., '22" <br />Terry Tamminen <br />O�relaryfw-, <br />onmental <br />otection <br />1 December 2004 <br />Mr. Peter Palomino <br />6420 7th Street <br />Riverbank, CA 95367 <br />Central Valley Region <br />Robert Schneider, Chair <br />11020 Sun Center Drive #200 Rancho Cordova, CA 95670-6114 <br />(916) 464-3291 • Fax (916) 464-4775 <br />http://www.swrcb.ca.gov/rwgcb5 <br />WORKPLAIA FOR SITEMITIJUX <br />JOAQUIN COUNTY <br />Arnold;Schwaraenegger <br />Governor <br />Central Valley Regional Water Quality Control Board staff (staff) has reviewed the Summary of Soil <br />Boring Investigation and Workplan for Site Mitigation, 23023 S. Santa Fe Road Riverbank (Workplan) <br />submitted on your behalf by Ground Zero Analysis Inc. Staff has the following comments: <br />1. The 23023 Santa Fe Road site is part of the former Snyder Sanitary Dump site and the site is a <br />Closed, Illegal, and Abandoned landfill. Responding to an investigation by the CIWMB in <br />September 2003, staff concluded that waste piles at the Snyder site are designated waste due to <br />lead concentrations and should either be clean closed or closed as landfill (covered). <br />2. The workplan reports the results of a soil and groundwater investigation that was limited to <br />23023 S. Santa Fe Road, a part of the Snyder site. The investigation found groundwater at 25 <br />to 40 feet below ground surface; soils are composed of intercalated sand, silt and clay; and <br />downgradient groundwater does not have detectable concentrations of VOCs or soluble lead. <br />Soil samples collected at 5 and 10 feet below ground surface did not detect soluble lead. It is <br />reasonable to conclude from these results that for the area covered by this investigation, the <br />waste as it is currently situated is not a threat to groundwater. <br />3. Staff understands that you pian on mitigating the waste piles and redeveloping the 23023 S. <br />Santa Fe Road site. The San Joaquin County Environmental Health Department is the lead <br />agency for this work. The Snyder site waste is still designated waste and if not handled <br />properly has the potential to degrade surface water or groundwater. Staff is concerned that re- <br />development should not inadvertently release waste constituents to surface water or <br />groundwater. Based on CIWMB's previous site investigation the threat to water quality comes <br />from burn dump ash and municipal solid waste. Construction debris found on site are unlikely <br />to be a threat to water quality. Ash and municipal solid waste that is exposed by redevelopment <br />should be discharged to an appropriate landfill. Also, any ash that remains on site should be <br />protected with a complete cover that prevents erosion of the ash into surface water drainages <br />and water from ponding on the ash, which should prevent the percolation of water through the <br />waste. With as little disturbance as possible, areas where ash will be left should be graded to <br />drain and covered with asphalt or other impermeable material. <br />®Cali ornia Environmental Protection Agency <br />CRecycled Paper <br />