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Di Salvo Tmdcing-Repxt <br /> 0M)bW27.1995 T <br /> PW.y <br /> WELL CONSTRUCTION <br /> 1 <br /> The monitor well was drilled using 8-inch O.D.,hollow-stern, continuous-flight augers and ' <br /> constructed with 2-inch I.D., Schedule 40, flush-threaded 0.020 machine-slotted PVC screen. The <br /> PVC screen extended from a depth of approximately 18.5 feet to 10.5 feet below ground surface <br /> (bgs). Blank PVC casing was installed above the well sc reen up-to the ground surface. A sand pack <br /> of 2112 Lonestar sand was placed in the annular space from the total depth to approximately 10 feet <br /> bgs. Bentonite pellets were placed from approximately 0 feet to 7.5 feet. A surface seal of neat <br /> cement containing five percent bentonite by weight was placed from the top of the bentonite seal to the <br /> ground surface. A water-tight traffic box was installed at the ground surface. A diagram of the final <br /> construction of MW 1 is attached. <br /> s <br /> WORK SCOPE <br /> The well will be destroyed by Spectrum Explorat on(C57 License#512268)under the <br /> supervision of a Condor geologist. Prior to decommissi ning, the total depth of well will be measured <br /> and compared to the construction depth to check for do -hole obstructions. The monitor well travel <br /> box will be removed from the ground surface and the PVC casing will be pulled out of the ground. <br /> The monitor well will then be re-drilled with 8-inch O.D., hollow-stem, continuous-flight augers to a <br /> total depth of approximately 18.5 feet bgs. A cement slurry containing five percent by weight <br /> bentonite will then be pumped into MW1 using a tremie iose. The augers will remain in the bore hole, <br /> as necessary, to insure the bore hole remains open during backfilling with the cement slurry. The <br /> estimated volume of grout required to fill MW 1 is equal o: <br /> V—n-eH <br /> where r= radius of bore hole(0.33 ft) <br /> H = height of bore hole (18.5 ft). <br /> The estimated volume of grout to destroy MW 1 s approximately 6.3 feet3 (48-gallons). The <br /> actual volume of grout placed in the well will be recorded and compared to the estimated volume. If <br /> L� CONDOR <br /> r — <br />