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Mr Kyle Christie Project 0805-140 03 <br /> • July 23, 1996 <br /> Page 6 <br /> 2.2 Well Abandonment Activities <br /> • Contract a licensed well driller to dell out monitoring well MW-3 using <br /> 10-inch-diameter augers The well will be drilled out to an approximate depth of <br /> 65 feet bgs, and the well casing filter pack, and surface seal will be removed The <br /> former well location will be grouted to ground surface using neat cement <br /> 2.3 Well Installation Activities <br /> • Once the old tank cavity has been backfilled, EMCON will observe a licensed well <br /> driller drill one 10-inch-diameter soil bonng in the old tank cavity The proposed <br /> boring location is shown on Figure 2 The boring will be drilled to groundwater <br /> (approximately 40 feet bgs) Based on field screening data (using a PID) of soil <br /> samples, EMCON will construct a dual completion 2-inch-diameter vapor <br /> extraction well (VW-5) The dual completion will consist of installing two <br /> 2-inch-diameter casings m the borehole The lower portion of the well is <br /> expected to be screened from approximately 22 to 42 feet bgs using 0 10 slotted <br /> screen The upper portion of the well is expected to be screened from <br /> • approximately 4 to 19 feet bgs using 0 10 slotted screen The purpose of the <br /> boring is to assess the vertical extent of hydrocarbons below the former USTs, <br /> and the dual completion we is o prove a sod vapor extraction coverage m the <br /> old tank cavity and below the cavity <br /> • Undisturbed soil samples will be collected from the boring located in the former <br /> tank cavity for classification and laboratory analyses at 5-foot intervals, or at soli <br /> changes, from the ground surface to the total depth of the boring <br /> • Dill cuttings will be stored on site and placed on and covered with visqueen <br /> Four soil samples will be collected from the drill cuttings to be composited into <br /> one sample at the laboratory for evaluation of disposal options <br /> • A minimum of two soil samples from the boring and the composite sample from <br /> the drill cuttings will be submitted to a state-certified analytical laboratory The <br /> samples will be analyzed for TPHG and BTEX by modified USEPA Methods <br /> 8015 and 8020, respectively In addition, the samples collected from the drill <br /> cuttings will be analyzed for total lead using USEPA Method 7410 and for <br /> corroslvity, ignitability, and reactivity <br /> SAON TJM805�08051400 3DS-95 pis 1 <br />