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Department of Toxic Substances Control <br />Terry Tamminen <br />Agency Secretary <br />Cal/EPA <br />May 13, 2004 <br />Ms. Patricia Bonnifeld <br />Owner/Operator <br />Ladd's Stockton Marina, Inc. <br />4911 Buckley Cove Way <br />Stockton, California 95219 <br />Edwin F. Lowry, Director <br />8800 Cal Center Drive <br />Sacramento, California 95826-3200 <br />Arnold Schwarzenegger <br />Governor <br />MAY 1 4 2004 <br />ENVIRONMENT HEALTH <br />PERMIT/SERVICES <br />VOLUNTARY CLEANUP AGREEMENT, DOCKET NUMBER HSA -A 03/04-142, <br />LADD'S STOCKTON MARINA, INC., STOCKTON, CALIFORNIA <br />Dear Ms. Bonnifeld: <br />The Department of Toxic Substances Control (DTSC) has reviewed the Work Plan to <br />Perform Environmental Consulting for Sandblast Debris at Ladd's Marina in Stockton, <br />California, dated October 20, 2003 and the Post Clean-up Confirmation Testing Report <br />of the Sandblast Debris Area at Ladd's Marina, dated December 24, 2003. A site visit <br />was conducted on May 7, 2004 to confirm the sandblast debris has been removed and <br />sample locations are appropriate. Our review is in response to a San Joaquin County <br />Environmental Health Department (SJCEHD) complaint inspection on May 12, 2003 in <br />which sample results for the sandblast debris exceeded Total Threshold Limit <br />Concentrations (TTLC) for copper. Three samples were collected of the sandblast <br />debris with copper concentrations ranging from 1,510 mg/kg to 10,200 mg/kg. The <br />TTLC for copper is 2,500 mg/kg. <br />As a result of the complaint inspection, the sandblast debris and the upper few inches of <br />soil surrounding the sandblast pad, from the edge of the pad to approximately 20 feet <br />from the pad, were removed. The soil/sandblast debris was characterized, determined <br />to not be hazardous and is currently stored on site for future off-site disposal. Three soil <br />confirmation samples were then collected from 0- to 3- inches and tested for total <br />metals to document the clean-up actions. Copper concentrations in these samples <br />ranged from 77 mg/kg to 150 mg/kg. <br />Our review indicates hazardous levels of copper have been removed from the sand <br />blast area and the copper concentrations remaining in site soil around the sandblast <br />area do not pose a health risk. No further clean-up actions are required for the <br />sandblast area. This decision is limited only to the sandblast area of the site. This <br />15 Printed on Recycled Paper <br />