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EEV{RONME9!iTALIN - <br /> 2460 Countryside Drive, Plac6rville, California 95667 Phone(530)295-1992 Fax(530)642-1760 <br /> F <br /> August 30, 1999 <br /> 2001-0103-01 <br /> Mr. George Takemori <br /> A. Teichert & Son, Inc. <br /> F.O. Box 15002 <br /> Sacramento, CA 95851 <br /> Re: Work Plan to Assess the Vertical Extent of Hydrocarbon Impact for A. Teichert and <br /> Son, Inc. Facility, Located at 103 NoA E. Street, Stockton, <br /> Dear Mr. Takemori: <br /> Stratus Environmental Inc. (Stratus) has prepared this work plan to conduct an additional <br /> assessment to evaluate the vertical extent of hydrocarbon impact beneath the site and to <br /> evaluate the effectiveness of the soil vapor extraction system that previously operated at <br /> the A. Teichert and Son, Inc. facility located at 103 North E. Street in Stockton(figure 1). <br /> Stratus has prepared the following proposed',�scope of work to complete the requirements <br /> associated with the project objectives. The proposed scope of work is based on <br /> information that Teichert has provided Stratus and from discussions with Mr. Harlin <br /> Knoll of San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD). Work will be performed in accordance with the RWQCB Tri-Regional <br /> Guidelines. <br /> SCOPE OF WORK <br /> The primary objective is to determine the vertical extent of hydrocarbon impact in the ! <br /> vicinity of MW-13 and MW-14, where petroleum hydrocarbons were observed at depths E <br /> of 90 feet below ground surface (bgs) durmg;Pa previous investigation. To accomplish this <br /> objective, one soil boring drilled to a depth�of 100' feet bgs is being proposed. Figure 2 <br /> presents the proposed boring location and oilier site features. However, as requested by <br /> PHS-EHD in their July 27, 1999 letter, the boring should continue until field observations <br /> and field screening indicates no contamination exists. The proposed drilling activity will <br /> also enable collection of soil samples from',approximately 30 to 90 feet bgs to evaluate <br /> the effectiveness of the soil vapor extractionsystem that targeted that depth. <br /> Teichert-work plan 1 <br />