2012-12-12_REVISION - P2010026 (3)

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located in the four ELHT wells between depths of approximately 2,100 ft (-80 ft below the dissolution surface) and surface will be retrieved. From a depth of approximately 2,100 ft down and in the horizontal section, the heater canister, heater, and associated instrumentation will be left in the heater wells. A metal bridge plug will be placed within the casing just above 2,100 ft TVD, and the well casing will be plugged with cement above the bridge plug to approximately 3 ft below the ultimate reclaimed ground surface. Well casings will then be cut 3 or more feet below final ground surface, per BLM Gold Book Standards. For ELHT the radial extent of thermal disturbance is expected to be small. Based on modeling, temperatures above 550 ° F are predicted to be localized to —2-ft radius around the heaters. As there is no thermal superposition in the heated volume, natural cooling is expected to be effective and will take approximately one year for the formation to cool to less than 200 ° F. Thermocouples installed along the heater canisters will be used for temperature monitoring. Abandonment of the heater wells will be completed after the temperature of the thermocouples indicates temperature along the heaters is less than 200 ° F. 5.2.5 Surface Reclamation Plan Surface reclamation will be completed to return the disturbed site to a beneficial post - mining land use. A synopsis of the surface reclamation plan follows. Details may be found in the Reclamation section of this NOI Modification. After the wells have been filled with cement, casings will be cut a minimum of 3 ft below the projected post grading ground surface level. Surface equipment not needed for steam recovery and oil water separation may be removed prior to or after decommissioning of the wells. Once all facilities are removed, concrete structures will be crushed on site, rebar will be removed and properly disposed off site, and concrete will be distributed evenly amongst the subsoil. Fill and cuts will be restored to approximate original contours, packed earth will be scarified, topsoil will be re- applied evenly, and the area will be re- seeded with the BLM- approved seed mix of native species. 5.3 Size, Location, Schematics of Structures, Facilities 5.3.1 Surface Facilities Descriptions The ELHT includes minimal additional surface facilities as it largely ties into the existing facility for East RDD Pilot discussed in Section 6.3A. The new facilities consist of a well pad, a variable voltage transformer (VVT) skid and a —600 ft long pipe rack enabling the tie in of the minimal production from the ELHT wells to the East RDD Pilot surface facility. The ELHT will be monitored and operated using the existing East RDD Pilot control system. All added operations infrastructure will be located inside the 8 -foot tall game fence. This area is gated to prevent access by wildlife and the public. Reclamation of the minimal additional facilities at the ELHT will be consistent with the East RDD. Incremental reclamation costs for the ELHT will be calculated based on the addition of a new well pad containing three horizontal wells and one inclined well and the foundation associated with VVT, and piping connecting the ELHT to the EAST RDD surface facilities. 6