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December 17, 2003 Project: 100933/03000000 Ms. Patricia Bonnifield Ladd's Stockton Marina, Inc. 4911 Buckley Cove Way Stockton, California 95219 Re: Post Clean-up Confirmation Testing Report of the Sandblast Debris Area at Ladd's Marina, Stockton, Ca. Dear Patty: The purpose of this report is to submit the results of the post clean-up confirmation testing of the sandblast debris area at Ladd's Marina. The location of the marina is shown on Sketch 1. The post clean testing was conducted in accordance with a work plan that was approved by the Department of Toxic Substances Control (DTSC). Background The post clean-up confirmation testing was performed after the following activities were conducted at Ladd's Marina. • The San Joaquin County Environmental Health Department (SJCEHD) conducted an inspection on May 12, 2003, in which three sandblast debris samples were collected and analyzed for total metals. The results of the testing are shown on Table 1. The only metal that exceeded the Total Threshold Limit (TTLC) was copper (2,500 milligrams per kilogram [mg/kg]), which varied from 1,510 to 10,200 mg/kg. The TTLC is used to define a Non-RCRA hazardous waste (this is a waste that is classified as a hazardous waste under California regulations, but not Federal regulations). • Ladd's Marina removed the sandblast debris in the soil after the results of the testing performed by SJCEHD were provided. In addition to removing the known impacted soil, the upper soil surface surrounding the sand blast area from the edge of the pad to approximate 20 feet from the edge was removed. This soil material was stockpiled with in the concrete -lined sandblast compound. These actions comprise the clean-up activities that have been conducted at the marina. CAWINDOWS\Temporary Internet Files\Content.IE5\UTCIOUZE\Ladd's Investigation Report[I].doc