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12 Geocon will retain Cascade Drilling (C57# 9381 10) and McMillan's Well Service, LLC. for the well destruction activities. Prior to destruction activities, the pump assembly will be removed and disposed of properly. The field staff will note the material of the casing, measure the diameter of the well, depth to groundwater, and total depth of the well. Measurements will be used to confirm specifications for wells that have well construction records. Measurements from wells with unknown specifications will be used to create well specifications. At each well, Cascade will perforate the well casing using depth -discrete explosive charges packed with projectiles. Explosive charges connected to detonating cord will be placed from the bottom of each well casing to the surface at 10 -foot intervals. After the explosive charges are placed, a neat cement grout will be pumped into each well to the surface with tremie pipe. When the grout level stabilizes in each well, the charges will be detonated perforating the well casing and permitting neat cement to enter into the formation. Following blast perforation, additional grout will be added to each well as necessary. The following table summarizes the approximate amount of explosives and grout required for each well. Well ID Diameter (i n) Estimated -� otal Depth (ft bgs) Estimated Amount of Charges Required Approximate Initial Grout Volume (gallons) 495 ..................... ... .__...._ 8 ......... 175 _....... ............. _.......... _.... 17 .... . ......._.._.. .... ..... .-. -.._.. 456 11717 ............. 6 170 _............... ..... ......... I ... 17 .. _...... _.... .................... _...... __......... _ ..................... . ......... _ ......... __.................. _...... _...... 249 17737 ................ 6 _... __ _ 55 ._................. ..... ._.-................................... 5 -...... .... _..... __..... _._...----...................... _............................... .......... ...... ....................... _. _._._ _................ _... ..... 80 _.... _..... _... _................ _................... _.............._.._---..._._.__. 17821 ._ .- --... . _ ..---- 6 - ..- ...... 115 11 _....... _._....... -- -- .................. _..._ ...... ------- _...... ...........168 17904 ---- ....... 5.5 _ . __ .._..... 69.6 ......____ .... 6 ...... _._....-.. ---.._..-..._...._... _._..... ...... ....._. _................._......._......... ..... ...... _...... __....... _ _.......... 85 17926 4.75 69 6 63 17933 ._......_......._._.__._..._..__.- 5.5 83 8 _........ _.... ......... _.._._._..-.--._...... . . . ........................... ._ . ...... ._.............. 102 17950 ..... 6 ......... 59 5 ............ .............. _.............. ....... _.............................. I......._ ...... _ ............ _.............. 86 17793 Unknown Unknown __... ...._.....__...... ......... 17850 Unknown Unknown _.._.._......_ .......... .... _._._.._.._._.........._.._...._......._....._.._..._.........._................... 17883 ......... Unknown . ......... .___.._..._....._ ... _................. _..._.. Unknown ._._...... 1 charge per 10 feet of well 5.8 gallons of grout per 17899 Unknown Unknown depth cubic foot of well volume .... ... _ 17911 ... Unknown ...._..------....._ _ Unknown 2145 Unknown Unknown Geocon Project No. S1358-03-05 - 2 - .lune 13, 2019