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Jersey Valley Geothermal Development Project Environmental Assessment: NV063 -EAO8 -091 2.1.2.2 Well Operations Once the well is drilled and well head completed, an industrial grate is placed over the hole to prevent humans and wildlife from falling into the cellar. Each of the production wells would be equipped with a pump to bring the geothermal fluid to the surface under pressure. The electricity to power the well pump motors would be supplied via an electric conductor installed from the power plant along the connecting pipelines. Wellhead dimensions for the production wells are not expected to exceed a height of fifteen feet above the ground surface or four feet in diameter. Welihead dimensions for the injection wells would be much smaller. An approximately 15-foot by 15-foot by 10-foot high motor control building may be located within approximately 50 feet of each production well. 2.1.3 GEOTHERMAL PIPELINES Geothermal production pipelines bring the geothermal fluid from the production wells to the power plant. Geothermal injection pipelines deliver the cooled geothermal fluid from the power plant to the injection wells. Approximately 4.72 miles of production pipeline and 2.85 miles of injection pipeline would be constructed within the Jersey Valley Unit Area (see Figure 4). The production and injection pipeline routes generally follow the shortest distance from each well pad to the next well pad or the power plant in order to minimize the amount of pipe required, reduce heat losses, reduce the energy required to move the fluids, and to minimize the amount of ground disturbance. Additionally, the proposed pipeline routes generally follow existing or proposed roads to facilitate ongoing monitoring and future maintenance. The final alignment of the pipeline routes would be dictated by the specific wells completed for the project and the need to match fluid characteristics and balance fluid volumes in these pipelines. Permanent and temporary surface disturbance associated with pipeline construction activities can be found in Table 5. 2.1.3.1 Operation and Maintenance Procedures of Pipeline The pipelines would be periodically inspected for leak detection, safety and vandalism during normal operations. The pipelines also would be subject to periodic ultrasonic thickness testing to detect any substantial thinning of the pipe wall. -14-
Jersey Valley Geothermal Development Project Environmental Assessment: NV063 -EAO8-09 1 2.1.4 Rights-of-Way for the Power Line and Access Road The Proposed Action also includes the construction and operation of an approximately 27.59-mile overhead electrical transmission line (NVN-87409) originating at the proposed Jersey Valley power plant and terminating at the proposed SPPCo. Bannock substation (see Figure 3). An additional ROW is requested from Lander County’s Buffalo Valley Road to the proposed SPPCo. Bannock substation and/or switching station. The proposed road is located seven (7) miles west of the junction of Highway 305 and the Buffalo Valley junction, and extends south approximately 0.50 miles to the substation and/or switching station (see Figure 11). 2.1.5 Transmission Line Corridor Ormat is also proposing to construct, operate and maintain an approximately 27.59 mile overhead 120 kV transmission line, originating at the proposed Jersey Valley power plant site and terminating at a proposed SPPCo. Bannock substation in the NE1/4, SE1/4 Section 28, T3ON, R43E; which is located on private lands (see Figure 3). The proposed transmission line would require a 200-foot wide ROW (90-foot permanent width and an additional 110-foot temporary width required for construction). Design characteristics can be found in Table 3. Table 3: Transmission Line Typical Design Characteristics Line length Approximately 27.59 miles Type of structure Single pole Structure height Single pole: 55 to 70 feet Span length Single pole: Approximately 300 to 400 feet Number of structures/mile Single pole: Approximately 14 to 18 per mile Voltage 120,000 2.1.5.1 Facility Design Factors and Additional Components The transmission line would be designed to meet all temperature, wind, voltage, span and structure height clearance requirements. The proposed transmission line would also provide raptor protection in compliance with the standards described in the “Suggested Practices for Raptor Protection on Power Lines, The State of the Art in 2006” (APLIC 2006). To prevent perching, a cone (Kaddas Enterprises type KE1058 or equal) would be installed on the top of each transmission line pole along the entirety of the transmission line (see Figure 12 and Figure 13). Staging areas would be located on public land and would be used to temporarily store materials required for construction (see Table 4 and Figure 5). - 15-
Page 1 and 2: In Reply Refer To: N-881 18 3200 (N
Page 3 and 4: The BLM MLFO has determined that in
Page 5 and 6: APPEAL PROVISIONS Decisions may be
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Jersey Valley Geothermal Developmen
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Finding of No Significant Impact Fo
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The “wetlands” potentially impa
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The EA’s mitigation and permit ap
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Form 2800- Issuing Office 14 (Augus
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I Table 1: Legal Description of Tra
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Jersey Valley Master Title Plat and
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— Figure 12: Jersey Valley Unit A
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9. The Holder shall comply with all
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shall be supported by a stipulation
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Form 2800- 14 (August 1985) UNITED
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Table 1: Legal Description of Trans
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Buffalo Valley (NVN-83484X) E Jerse
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May 10, 2010 N-87409 EXHIBIT B 1.0
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approved in writing by the Authoriz
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Form 2800- Issuing Office 14 (Augus
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____________ Buffalo Valley Jersex
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May 10, 2010 N-88390 EXHIBIT B 1.0
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shall be supported by a stipulation
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Form 2800- 14 (August 1985) UNITED
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The Authorized Officer must approve
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Attachment E CONDITIONS OF APPROVAL
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Migratory Birds Attachment E CONDIT
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Migratory Birds Attachment E CONDIT
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Lands & Realty Attachment E CONDITI
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ATTACHMENT F EA COMMENT RESPONSES T
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for increased patrols to the Jersey
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