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l � 3 <br /> kn KLEINFELDER <br /> SAN JOAQUIN COUNTY MOTOR POOL <br /> WASTE OIL TANK CLOSURES <br /> SITE ASSESSMENT WORK PLAN AF2 2 ,. ; ► <br /> SCOPE OF SERVICES <br /> BACKGROUND <br /> According to a letter from the San Joaquin Local Health District (SJLHD) an <br /> unauthorized leak from two underground waste oil storage tanks has apparently occurred <br /> at the San Joaquin Motor Pool, 444 S. Wilson, Stockton (Plate 1). In the letter, the SJLHD <br /> requests that a soil remediation work plan be prepared for the site and states that the <br /> extent and origin of the contamination is unknown. The letter also states that additional <br /> sampling must be conducted to allow proper remediation. Depth to groundwater in the <br /> vicinity of the project is approximately 50 feet based on a ground water contour map <br /> developed for the "Semi-Annual Ground Water Report, Spring 1988" by San Joaquin <br /> County Flood Control And Water Conservation District. This work plan is for a limited <br /> soil assessment to evaluate the lateral and vertical extent of soil contamination at the <br /> former waste oil tank locations. <br /> SCOPE OF WORK d1- <br /> Soil Boring 0 <br /> .9 pr`�� <br /> Three borings will be drilled around each former tank location for a total of six borings at <br /> the approximate locations shown on Plates 2 through 4. <br /> The soil borings will be drilled using a truck-mounted drill rig equipped with 6- or 8-inch <br /> hollow-stem augers. During the drilling, an experienced Kleinfelder geologist will classify <br /> OqDilling <br /> subsurface soil, collect soil sam les, and log the borehole. Upon completion of the soil <br /> ng and samp ing, t e ormg willa ac i e With neat cement. oma. <br /> augers will be steam cleaned prior a initiation of each borehole. The <br /> piing equipment will be cleaned wi resod' a wash and a distilled water <br /> e prior to the collection of,each s i sample. � `LJLA <br /> Sampling Procedures <br /> Soil samples will be collected for the ' al analysis and to 1 the subsurface lithology. <br /> Samples will be collected eve 5 feet t a de . a 1 20 feet. Drilling and soil <br /> sampling below 20 feet can be performed upon written change or er approval of San <br /> Joaquin County. Drilling will not extend beyond 40 feet or first encountered ground water. <br /> Soil samples will be collected by advancing the boring to a point immediately above the <br /> sampling depth and then driving a Modified California Sampler lined with three brass <br /> tubes into the undisturbed soil. -The sampler will.then be removed from the bottom of the <br /> boring and the bottom (third) tube sealed with Teflon tape and tight-fitting plastic caps. <br /> The sealed tube will be immediately stored in an iced cooler. <br /> 170-89-387 1 <br />