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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 /> ft b <br /> ( g ) <br /> _ (i n) s charges Required <br /> (gallons) <br /> 495 8 175 17 456 <br /> .............. .. .................... .......... .................- ._........................................................... ................................._.............. <br /> 11717 6 170 17 249 <br /> .......__.................... .................... .... ......... .... ........ .............._....................._.... _...._....................._.... <br /> 17737 6 55 5 80 <br /> _ ..__............. .. ... _ ...... _.....__ ........ .. . __.._...__....__...... <br /> .__.... <br /> 17821 6 115 11 168 <br /> ­­­_1.. - . ..._..._. ..... .. .._..._....._ .... ..... .. . ._..._ __ _.... .............--- <br /> 17904 5.5 69.6 6 85 <br /> -- _._.._ . __ ......._ _. _ ._.............. _...... _.._... . ....--- <br /> 17926 4.75 69 6 63 <br /> _ ............. ...._.. .._ ......... _.. __._ .. _......... _.... <br /> 17933 5.5 83 8 102 <br /> _ __ <br /> _..__._......._....._ ..-_.._._.-.- _.._.._..._.._..._..__.._...._._......._... --.._.._..---...--......_ _ _...._-....__......_.................._...._.. ..............................................................--...._......._..........................._.._.. <br /> 17950 6 59 5 86 <br /> __-....... _ _.....__..__..._..._.. -- - _._._ _._...- ---..-- .......... . ......._...... ................. ...._. <br /> 17793 Unknown Unknown <br /> ................._...................___......_....._.._...__....._.___.,..._.. ----- <br /> 17850 Unknown Unknown <br /> _.-__.._._...................._._........_.__......................... _........._.......... <br /> . <br /> 17883 Unknown Unknown 1 charge per 10 feet of well 5.8 gallons of grout per <br /> _..._......_ _..........._._.... <br /> 17899 Unknown Unknown depth cubic foot of well volume <br /> ............ ....__..__. ._................ <br /> 17911 Unknown Unknown <br /> ................................................. <br /> 2145 Unknown Unknown <br /> Geocon Project No.S1358-03-05 -2- June 13.2019 <br />