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1 <br /> PACIFIC <br /> .10 ENVIRONMENTAL , <br /> GROUP INC. <br /> December 2, 1997 <br /> Project 311-165.7A <br /> Mr. Edward Ralston <br /> Tosco Marketing Company <br /> 2000 Crow Canyon Place, Suite 400 <br /> San Rai-non, California 94583 <br /> Re: Addendum Work Plan <br /> Unocal Service Station 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Dear Mr. Ralston: <br /> The following addendum work plan is presented in response to'a letter request from San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD), <br /> dated September 26, 1997, regarding the site referenced above. This is a contingent <br /> work plan, the implementation of which is dependent upon a decision on a closure <br /> request already submitted to the State Water Resources Control Board, Division of <br /> Clean Water Programs, UST Cleanup Fund (the Fund). if the Fund concurs with the <br /> closure request, the work plan will not be implemented. if closure is not granted, the <br /> findings of the appeal would be applied to amend or modify this work plan's presented <br /> scope of work. <br /> In a series of correspondences, PHS/EHD has requested Tosco Marketing Company <br /> (Tosco) to prepare an assessment work plan which will include the following tasks: <br /> • Installation of a minimum of four new groundwater monitoring wells. <br /> • Performance of a soil investigation to assess the ethectiveness of the <br /> soil vapor extraction (SVE) system. <br /> • Measurement of the radius of influence of the operating SVE system. <br /> • Installation of air sparge wells to assess air sparging as a supplemental <br /> remedial method for residual hydrocarbons in saturated soil and- <br /> Qroundwater. <br /> 2025 Gateway Place, Suite 440, San lose, California 95110 (408)441-7500 FAX(408)441-7539 <br />