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1-07-1998 5: 10PM FP,CM PACIFIC SACRAMENTO 916 858 2355 P• 2 <br /> PACIFIC <br /> ENVIRONMENTAL <br /> GROUP INC. <br /> January 7, 1997 <br /> Project 920-119.1A <br /> Ms. Mary Meays <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue <br /> Stockton,California 95202 <br /> Re: Work Plan Addendum for Waste 09 Tank,Hoist,and Product Line <br /> Removal <br /> Chevron Station 9-6171 <br /> 6663 Pacific Strect at Benjamin Holt Drive, <br /> Stockton, California <br /> Dear Ms. Meays: <br /> On behalf of Chevron Products Company(Chevron),Pacific Environmental Group Inc. <br /> (PACIFIC) is performing environmental services associated with the removal of a waste <br /> oil tank,three hoists,and product lines at the above referenced site(Figure 1). A Work <br /> Plan for Waste Oil Tame Hoist and Product Line Removal,dated November 4, 1997, <br /> was submitted to San Joaquin County Environmental Health Department(SJCEHD) <br /> describing the anticipated work scope prior to the commencement of field work <br /> Subsequent analysis of collected soil samples revealed soil beneath thercruoved waste <br /> oil tank and fuel dispensers was impacted. <br /> Pcrsuant to your request,the following addendum to the Work PIan was prepared to <br /> address specific aspects of soil over-excavation,the type of excavation equipment to be <br /> used, confirmation soil samling frequencies and locations,and target analytes proposed <br /> for confirmation sampling. <br /> PROPOSED ADDITIONAL SCOPE OF WORK <br /> Soil confirmation samples will be collected from the product lines per the Tri Regional <br /> Board Staff Recommendations for Preliminary Evaluation and Investigation of <br /> Underground Tank Sites. Additional soil samples will be collected at dispenser areas <br /> previously determined by laboratory analysis to be impacted by hydrocarbons. <br /> The vertical and horizontal extent of impacted soil will be delineated by collecting one <br /> sample from each side wall and one sample from each floor area of over-excavation <br /> pits. Over-excavation will be conducted at the former waste oil tank location and at the <br /> 1 1315 Sunncc Cold Circle, Suite M, Rancho Cordova.Califomia 95742 (91(7)858-2350 FAX(91 fit 858-2355 <br />