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Geocon will retain Cascade Drilling (C574 938110) and McMillan's Well Service, LLC. for the well <br /> destruction activities. Prior to destruction activities, the pump assembly will be removed and disposed of <br /> properly. The field staff will note the material of the casing, measure the diameter of the well, depth to <br /> groundwater, and total depth of the well. Measurements will be used to confirm specifications for wells <br /> that have well construction records. Measurements from wells with unknown specifications will be used <br /> to create well specifications. At each well, Cascade will perforate the well casing using depth-discrete <br /> explosive charges packed with projectiles. Explosive charges connected to detonating cord will be placed <br /> from the bottom of each well casing to the surface at 10-foot intervals. After the explosive charges are <br /> placed, a neat cement grout will be pumped into each well to the surface with tremie pipe. When the <br /> grout level stabilizes in each well, the charges will be detonated perforating the well casing and permitting <br /> neat cement to enter into the formation. Following blast perforation. additional grout will be added to <br /> each well as necessary. The following table summarizes the approximate amount of explosives and grout <br /> required for each well. <br /> Estimated Approximate Initial Grout <br /> Well ID Diameter Total Depth Estimated Amount of Volume <br /> (I n) (ft bgs) charges Required (gallons) <br /> 495 87.75 17 456 <br /> .......................... _ _ ... ....... ... ........ .. .. .. . ....................... <br /> 11717 6 170 17 249 <br /> .................... .......... ......... . .............................. ................................................. <br /> 17737 6 55 5 80 <br /> _. ........ _..__......_ - - .. ... _ .._... .............. <br /> 17821 6 115 11 168 <br /> ....__... .........__ ..... .... ........ ._..... ..... ............................................__.._.............._.........._.... <br /> 17904 5.5 69.6 6 85 <br /> ............_. _ _......... ........ ......_.. ..__._.....__ ........... . . .... ................. _.......... ... .. ......._................._... <br /> 17926 4.75 69 6 63 <br /> - _.._. _. _......._ .__ -... _. .. .......... <br /> _ __.._....... <br /> 17933 5.5 83 8 102 <br /> - --.. ... — ...... __ _ .__.—__._._..__ _._.._.... _.... <br /> 17950 6 59 5 86 <br /> - _..._... ........ ......... ._ _...... ...... ......._. _......_....._ ......... <br /> 17793 Unknown Unlwown <br /> __ _ ........._...__ _...._ <br /> 17850 Unknown Unknown <br /> ...__........... - ..._......................_......_ ....._..._.._ ..........-..........._.._._.._ <br /> 17883 Unknown Unknown 1 charge per 10 feet of well 5.8 gallons of grout per <br /> 17899 Unknown Unknown depth cubic foot of well volume <br /> ............. <br /> - <br /> 17911 Unknown Unknown <br /> .............................. <br /> 2145Unknown Unknown <br /> Geocon Project No.S 1358-03-05 -2- June 13,2019 <br />