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HisWry Well 21,3 • ~ • Well 21~ History •~ (Includes UinMa, A Groove, B Groove, and DlseoluUon Surface) Location Coordinates Collar Elevation Duration of Drilling Total Drilled Depth Summary Report by Section 21, T1S, R97W, 6"' PM Northing 14414.14, Easting 16623.32 6122.26 ft amsl July 1, 1999 through July 8, 1999 1420 ft American Soda July 1999 'StrafOgraphic Inter_Yals: and Maricers_= .~ ;: , ~ ,_, _ _ ., ~.w~ ...~ '~~. _.~ ~ ._ ~t ,__ 3 Uint • Formation Surface - 536 ft A -Groove 699 - 725 ft B -Groove 906 - 930 ft Dissolution Surface 1307 ft Total Depth (TD) 1420 ft Drilling and V11ell Completion Drilling began on well 21-3 on July 1, 1999. Drilling to a TD of 1420 ft was completed on July 8, 1999. Drilled from surface to 62 ft with a 19 -inch-diameter tri-cone rock bit. A 14-inch-outside diameter (OD) surface conductor casing was run to 62 ft and cemented in place. After the conductor casing cement hardened, a 12.25-inch-diameter tri- • cone long tooth button bit was used to advance the well to a TD of 1420 ft. Rock chip samples were separated from drilling fluids in a cyclone separator and passed over a shaker table for recovery at 5-ft intervals. Drilling fluid consisted of clear water, with a light bentonite and polymer mud additive. Geophysical logs were recorded on July 9, 1999. Dissolution Surface To prepare the borehole for the first and deepest monitor well installation, the hole was cemented from 1420 ft (TD) up to 1316 ft with 77 sacks of Class A Type II cement with ' 1 % calcium chloride. The cement was placed via a string of 1.75-inch-OD tremie line composed of nominal ZO-ft pipe joints. The Dissolution Zone well (21-3D) was installed after the cement set, and completed with a 10-ft fiberglass, #20 slot screen at 1273 to 1283 ft near the Dissolution Surface (1307 ft). The silica sand filter pack was placed from 1262 to1292 ft. Bentonite hole plug was placed immediately above and below the sand filter pack at 1238 to 1262 ft and 1292 to 1316 ft, respectively. All annular fill materials were placed via the 2.19-inch-OD tremie line. The Dissolution Zone well casing was constructed with a string of Centron 2.375-inch, 1.29 Ib/ft, upset end fiberglass casing in nominal 29-ft lengths from surface to 1273 ft.