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Court <br /> ve <br /> ►►► R E l M 1 C Ir � L f RN E R sac amento,IC 95864 <br /> ENGINEERING AND ENVIRONMENTAL SERVICESTelephone: (916) 485-7222 <br /> FAX: (916)485-8098 <br /> i <br /> 6 February 1998 <br /> Mr. Charles Leubner <br /> Stockton Unified School District 3 2 <br /> 1932 N. El Pinal Drive ' <br /> Stockton, California 95205 <br /> Subject: Work Plan for Soil Investigation <br /> Transportation Center/Corporation Yard <br /> Stockton Unified School District <br /> HLI 00817 <br /> Dear Mr. Leubner: <br /> i <br /> i <br /> This work plan describes a proposed soil investigation at three areas within the Stockton Unified <br /> School District's Transportation Center located at 1932 North El Pinal Drive (see Figure 1). It is <br /> submitted in response to the 10 December 1997 letter from Mr. Steve Sasson of the Public <br /> Health Services, San Joaquin County Environmental Health Division (PHS/EHD) requesting <br /> soil investigations at the former sites of an underground gasoline and diesel tank, and at one <br /> location along the remote fill pipeline for the diesel tank. . . <br /> 1 <br /> The soil investigation is intended to evaluate the vertical and lateral extent to which petroleum <br /> hydrocarbons have migrated into native soil. In order to accomplish this task, we recommend the <br /> drilling of soil borings to collect soil samples for laboratory analysis. A scope of work and <br /> 1f schedule for this investigation is presented below. <br /> t <br />' BACKGROUND <br /> Diesel Tanks and Remote Fill Pipeline <br /> On 23 December 1996, three diesel tanks (Tanks T5, T6, and T7- see Figure 2) and the remote <br /> fill pipeline (see Figure 3) were removed. Soil samples were collected from the tank excavation <br /> and from a depth of 2 feet below the bottom of the pipeline trench at 20-foot intervals. <br /> Due to staining noted in the east sidewall near the north end of Tank T7, the base of the <br /> excavation near Tank T7 was overexcavated to a depth of approximately 18 feet, the maximum <br /> depth the backhoe could reach. Sample 604 was collected at the base of the excavation and <br /> contained diesel hydrocarbons at a concentration of 6,150 mg/Kg (refer to Table 1). Clean pea <br />