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O <br />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 />Well ID <br />495 <br />11717 <br />..........1............1..1..1... <br />17737 <br />17821 <br />17904 <br />17926 <br />17933 <br />17950 <br />17793 <br />17850 <br />.._........... . _.1111... .. <br />17883 <br />17899 <br />-.... ...... ..................... <br />. <br />17911 <br />...... ...... . ........... <br />2145 <br />Diameter <br />(in) <br />8 <br />_ ........ _....._..................... <br />6 <br />--------- --. _. _............... <br />6 <br />_1111. ,11_11 <br />6 <br />................. <br />5.5 <br />_...... _..... <br />4.75 <br />--.1-1.11-1 ................... .... - <br />5. <br />1.111.. ....................._..- <br />5.5 <br />6 <br />............- _. <br />Unknown <br />..- ................................. . <br />Unknown <br />Unknown <br />Unknown <br />.__.......... _._..._ -- - <br />Unknown <br />......................... _ .......... <br />Unknown <br />Estimated <br />Total Depth <br />(ft bgs) <br />175 <br />170 <br />-.... _.. _ _........... . <br />55 <br />....................... <br />115 <br />... _.... _................................... <br />69.6 <br />......................... _.... <br />69...._..... <br />...83 _.... <br />.....--.__..59 . <br />......... _..111_.1.. _11.1 ......... _1.. <br />Unknown <br />.............................................. _.. <br />Unknown <br />._.-.... _.._....._.__....._1111... <br />Unknown <br />Unknown <br />Unknown <br />..111 <br />...1 ........................... <br />Unknown <br />1 charge per 10 feet of well <br />depth <br />5.8 gallons of grout per <br />cubic foot of well volume <br />Geocon Project No. S1358-03-05 - 2 - June 13, 2019 <br />H <br />