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i <br /> ONE <br /> f-+ <br /> _" � M <br /> September 13, 1991 <br /> Unocal Station No- 6981, Stockton, California <br /> ocarb <br /> ils is <br /> ntered <br /> surface grade and soil suspected w llcnotabei(trilledrtto 75�feet belowlsurface <br /> above the clay layer, the g of the site, and one <br /> grade. Two borings will be near the north <br /> boundary <br /> boring near the southwest boundary ro�imately 45 feet <br /> o Observe drilling of four 10-inch soil borings onsite to3 jicenscd well driller, <br /> below surface grade, The borings will be drilled by ` s OR the north side <br /> One boring will be drilled °n the south side and two boring <br /> dispenser islands, and one boring near the northwest corner of the <br /> of the disP <br /> underground storage lank cavity. <br /> o <br /> Collect and classify relatively undisturbedosQc samples <br /> c anges t zn po t intervals2 1/1 �of <br /> 55 feet below surface grade, or at lit io g <br /> intervals from 55 to 75 feet below grade, or at lithological changes, for <br /> possible laboratory analysis. cter <br /> rade. Tile <br /> Observe const:action of three 2-ii �i di at 75 fee�ibelowasurfaceter lgrade wells <br /> ° s to be terminated in the three boring .r licensed well driller. <br /> wells will be constructed by <br /> o Observe cos in the <br /> nstructi°n of four 4-inch uthi s deter vapor <br /> of the dispenser i�landsl andtile <br /> borings drilled an the north an <br /> boring near the northwest corner of the underground storage tank cavity, <br /> wells will be constructed by a licensed well driller. <br /> 0 <br /> Develop, purge, and sample the groundwater monitoring wells. <br /> ry for <br /> o h drocarbons as gasoline{'1`pHg)and for benzene, <br /> Submit three soil samples from each boring to aState-certified ibsoiltsample <br /> analysis of total petroleum y <br /> One <br /> ust above ground water will be submitted for <br /> toluene, ethylbeenaz h <br /> and <br /> dgtj tat xylene isomers water <br /> boring submitted <br /> ill be selected <br /> collected from les from each g <br /> laboratory analyses_ The other two sampVe evidence of hydrocarbons. <br /> for laboratory analysis based on subj <br /> tory for <br /> Submit water samples from the threeinealddition,State-certified <br /> tile gr°und•waterasamles <br /> ° and for BTEX <br /> analysis of TPHg zed for n'strate-N and total <br /> 8 f collected from wells MW-7 and NIW-8 will be analyzed <br /> and fecal coliform bacteria. <br /> 6 <br /> 386:'W <br /> j <br />