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�A Unnitoring Well Destruction Work Plan Raymond Investment Corporation November 20,2012 Page 4 The soil cuttings, pieces of PVC casing, and any broken asphalt will be placed in roll-off containers or Department of Transportation-(DOT) approved 55-gallon drums, sealed, Iabeled,and left on-site pending laboratory analyses for characterization and disposal. Traffic boxes will be recycled or disposed of in the trash. Samples will be analyzed for TPH-G and TPH-D by EPA Method 8015M, for benzene, toluene, ethyl benzene, total xylenes (BTEX) by EPA Method 8020B, and for lead (soil only) by EPA Method 6060 or equivalent method. A representative from the SJCEHD, if available, will verify that an adequate seal has been installed. The estimated volume of grout required for each monitoring well was calculated assuming 30% sand pack porosity or that the boring will be over-drilled with 10-inch hollow stem augers. Estimated volumes are shown in Table 2 and Table 3. Table 2: Estimated Grout Volumes for Over-Drilled Wells Well Condition Method TD BD ODD TV MW-4 Dirt Drill 45 10 10 184 1 MW-5 Dirty Drill 45 8 10 184 V VW-4 Clean Drill 5.3 4 4 3.4 tl VW-5 Clean Drill 5.3 4 4 3.4 VW-6 Clean Drill 5.3 4 4 3.4 Clean or Dirty=clean if laboratory data from the last sampling event reported non-detectable concentrations of constituents of concern,with acceptable laboratory reported detection limits Drill=over-drilling TD=total depth,in feet BD=Boring Diameter in inches,volume is 4.08 gallons per linear foot for a 10 inch diameter,volume is 2.61 gallons per linear foot for a 8 inch diameter,volume is 0.65 gallons per linear foot for a 4 inch diameter - ODD=over-drilling auger diameter TV=estimated grout volume required in gallons Table 3: Estimated Grout Volumes for Pressure Grouted Wells Well Condition Method TD CD CV BD Sand Int. SV TV Y MW-1 Clean Press 47 2 7.67 8 30-47-17 10.64 18 X MW-2 Clean Press 47 2 7.67 8 30-47=17 10.64 18 Y MW-3R Clean Press 47 2 7.67 $ 30-47=17 10.64 18 �- MW-4D Clean Press 70 2 11.4 8 56-70=14 8.72 20 V MW-6 Clean Press 45 2 7.34 8 23-45=22 13.61 21 MW-7 Clean Press 45 2 7.34 8 23-45=22 13.61 21 Press=pressure grout TD=total depth,in feet BD=Boring Diameter in inches CD=casing diameter in inches,volume is 0.163 gallons per linear foot j CV=casing volume in gallons l Sand Int.=sand interval,in feet SV=sand interval volume is 0.620 gallons per linear foot when BD is 8-inch and assuming 30%porosity TV=CV+sV=estimated grout volume required in gallons 5.0 REPORTING Condor will prepare a report detailing the well destruction to be submitted to the SJCEHD. The report will include a discussion of the field and laboratory procedures used, a presentation of the analytical results, manifests from waste disposal, and recommendations. �. CONDOR