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V"� BY FACSIMILE AND U.S. MAIL <br /> ft <br /> press , ,,+� <br /> nvironmental ` ��J # <br /> August 23, 1995 <br /> Ms. Diane Hinson and Mr.Steve Sasson <br /> San Joaquin County <br /> Public Health Services, <br /> Environmental Health Division <br /> 445 North San Joaquin Street <br /> Stockton, California 95201-0388 <br /> Re: Workplan for Soil Excavation and Additional Testing in Former Acetone <br /> Pipeline Area, 950 Industrial Drive, Stockton, California <br /> Dear Ms. Hinson and Mr. Sasson: <br /> This letter presents the scope of work for soil excavation and additional testing at 950 <br /> Industrial Drive, Stockton (see Figure 1). This workplan is based on the results of soil <br /> sampling conducted at the site on July 25, 1995, and discussions with Mr. Steve Sasson <br /> on August 2 and 3, 1995. The following sections summarize the results of the recent soil <br /> sampling event and present the proposed scope of work. <br /> RESULTS OF JULY 1995 SAMPLING EVENT <br /> In accordance with Cypress Environmental's June 23, 1995 Revised Workplan for Soil <br /> Sampling at Former Acetone Tanks Area, four soil borings were drilled on July 25, 1995 <br /> in the area of the former acetone tanks and pipeline (see Figure 2). Borings CE-1 and <br /> CE-4 were drilled near the east and west ends of the former acetone product tank (Tank <br /> 1). Boring CE-2 was drilled near the north end of the former waste acetone tank (Tank <br /> 2). Boring CE-3 was drilled near the former pipeline. As agreed to by the County, soil <br /> samples for analysis of volatile organic compounds (VOCs) were collected in the native <br /> material beneath the former tank and pipeline excavations. The boring logs and certified <br /> analytical reports for the recent work are attached. <br /> Soil samples collected at depths of 17.5 to 20.5 feet from borings CE-1, CE-2, and CE-4 <br /> did not contain detectable concentrations of VOCs. The soil sample collected at a depth <br /> of 4 feet from boring CE-3, drilled in the area of the former pipeline, was reported to <br /> contain acetone (0.140 milligrams per kilogram [mg/kg]), benzene (0.017 mg/kg), and <br /> 2-butanone (0.025 mg/kg). <br /> Based on the U.S. Environmental Protection Agency's Preliminary Remediation Goals <br /> (PRGs) for residential sites (February 1, 1995), the concentrations of VOCs in the <br /> 111 W. Evelyn Avenue - Suite 305 - Sunnyvale,CA 94086 - Tel. (408) 774-6767 - Fax (408) 774-6757 <br />