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KLEIN FELVER <br /> i !1 <br /> , <br /> x '; :k PROPOSED EXCAVATIONAND SOIL SAMPLING .' <br /> >" w SAN JOAQUIN COUNTY MOTOR POOL `t <br /> STOCKTON, CALIFORNIA ' <br /> '' SCOPE OF WORK AND COST ESTIMATE <br /> X x ` 247'YY2479 r <br /> E June 24, 1991 <br /> INTRODUCTION <br /> The San Joaquin County 6 Motor Pool is':located at X144 SouthVIJilson Way; Stockton, <br /> r California: The facility operated two underground waste oil storage,tanks (USTs) onsite at <br /> two separate locations. A 500-gallon UST wa."s located north of the auto repair.shop (Tank <br /> -v� 7� # #5 :location) and a 1,000-gallon UST was ,located 'south of the tire shop''(Tank '#3 <br /> ° r location.):'-The locati6ns of the'tanks,'and :buildin s are-shown_on.:tile Site Plan Plate :1: <br /> t f.=, Both storage tanks-were excavated;reindved and the excavations sampled in May 1998. <br /> I '- L2 Soil Soil sampling. results indicated "extractable ` total petroleum 'hydrocarbons (TPH) <br /> 14 , concentrations of 26 mg/kg in one `of the two samples collected from the 500-gallon tank <br /> excavation bottom and 620 and 320 mg/kg iiii'two samples collected from'the:1;000-gallon <br /> y 1..., -tank excavation bottom,' Based on:i these"res ults, the.San Joaquin County .Department:of <br /> ' <br /> He <br /> Public Health .Services, Environmental- alth Department .(SJCEHD)., requested. .an . : . <br /> assessment of the lateral and vertical extent,of;the affected soil: I' <br /> In November :1989; Kleinfelder advanced'`three soil borings �4round.each of the former <br /> " tanks. Analytical results indicated TPH concentrations of 12 mg/kg at a depth of 21.5 feet <br /> below the, surface in one baring drilled adjacent to the former 5.00-gallon UST: TPH ; <br /> concentrations ;_were not detected in the sarr���ipples 'ar <br /> drilled adjacent toialyzed from the three ,soil borings . h <br /> the former 1,0007gallon UST. t`' <br />� �A.ryi G,r c s ;;, <br /> ' tt# �� The SJCEHD in a letter dated April' 12,: 1991, .requested tlie'. Sail Joaquin County <br /> � <br /> 'Department of Government Buildings SJCD.GB further excavate', the Tank;#3 location <br /> former 1;000-gallon UST) to remove soil affe,cCed by petroleum hydrocarbons beneath the ;. <br /> ormer tank The request includes sampling to verify that;the affected soil',has been <br /> i�:removed. F Y <br /> ` SCOPE OF SERVICES ft <br /> t , <br /> Task.1 - Work Plan°: <br /> .y dl <br /> Kleinfelder will prepare a soil remediation work plan for the review and consideration of ri <br /> the SJCEHD. .;The work plan will present the proposed scope of work to provide a clear x <br /> understanding of the required ,remedial apro"cedures. The work:plan will,-outline the <br /> following: 5i F r w ('�`y`rr/■y <br />,, ,p s <j* "{55 ► ' Soil Sample Locations <br /> r� ► Methods of Soil Removal aiid�Sampling <br /> 1J <br /> Laboratory Analysis <br /> Report Preparation s <br /> PF2-91-19 11A j h f; <br /> Copyright 1991 Kleinfelder, Inc. <br />