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* Corporation <br /> �t W 39 Cambridge Road, Suite 220 <br /> \\\ Cameron Park, CA 95682-9007 <br /> Tel 530 676 6884 <br /> theVF*OUP. <br /> Fax 530 676 6885 <br /> • A Member of The IT Group <br /> Q ' <br /> C:7 - <br /> June 1, 2000 c <br /> Project 911-011 1B <br /> 4/7_r <br /> Mr Ed Ralston <br /> Tosco Marketing Company a <br /> 1380 Lead Hill Road <br /> Roseville, California 95661 cn <br /> Re Work Plan Addendum <br /> Tosco (Former Unocal) Service Station #4409 <br /> 1502 North El Dorado <br /> Stockton, California <br /> Dear Mr Ralston <br /> This letter, prepared by IT Corporation (IT) on behalf of Tosco Marketing Company (Tosco), <br /> presents an addendum to the May 18, 2000 Additional Site Assessment Work Plan The Work <br /> Plan proposed three borings for vertical delineation of soil and groundwater impacts at the <br /> subject site After reviewing the proposed scope of work, the San Joaquin County Public Health <br /> Services Environmental Health Division (PHSEHD) requested an addendum to include <br /> collecting one groundwater sample at a location east of MW-3 The purpose of the additional <br /> sampling point is to provide lateral delineation of groundwater impacts at the water table <br /> Borings GP-1 through GP-3 will be completed prior to GP-4 to provide information on depth to <br /> water A water level measurement in MW-3 will also be recorded <br /> PROPOSED SCOPE OF WORK <br /> The scope of work will be expanded to include boring GP-4 and collection of the groundwater <br /> sample from first-encountered groundwater at the location shown in Figure 1 <br /> The specific scope of work is discussed below <br /> • Geoprobe Boring. Geoprobe boring GP-4 will be driven using a CPT rig at the <br /> general location shown on Figure 1 The boring will be advanced approximately <br /> 2 to 3 feet into first-encountered groundwater Anticipated depth to groundwater <br /> based upon monitoring well data is approximately 29 feet below ground surface <br /> Because boring MW-3 provided lateral delineation of soil impacts, no further soil <br /> sampling and analysis are proposed A groundwater sample will be collected <br />