DOI-BLM-CA-ES-2013-002+1793-EIS

NEPA Document Collection for: DOI-BLM-CA-ES-2013-002+1793-EIS
EIS at Long Valley Caldera Geothermal Area for Geothermal/Power Plant

Casa Diablo IV Geothermal Development Project EIS at Long Valley Caldera Geothermal Area for Geothermal/Power Plant

Proposed Action

Casa Diablo IV (CD-IV) Geothermal Development Project. ORNI 50 LLC, a wholly-owned subsidiary of Ormat Nevada Inc., (the Applicant) proposes to construct, operate, maintain and decommission a 33 megawatt (MW) geothermal power generating facility and related infrastructure near Mammoth Lakes in Mono County, California.

Data Completion Notes

Same problem as when populating the other EIS. The Wildlife mitigation text is so long that when I try to save it, I get the OpenEI error screen saying OpenEI will be down for up to 10 minutes. Same problem in Chrome and Mozilla. Note left in Wildlife section saying measures are too long to paste in and to refer to EIR/EIS.

Public Health and Safety measures placed under Wastes Hazardous and Solid.

Data entry complete.

Documents

EA/EIS Report:

• Cd4 final eis-eir volume 1
• Cd4 final eir volume 2 appendices a-f
• Cd4 final eir volume 2 appendices g-h
• Cd4 final eir volume 2 attachment g1 part 1
• Cd4 final eir volume 2 attachment g1 part 2
• Cd4 final eir volume 2 attachment g1 part 3
• Cd4 final eir volume 2 attachment g2 econbenefits 2012

FONSI:

• CD-IV Final BLM ROD 081213.pdf
• CD-IV ROD APPX1 MAPS.pdf
• CD-IV ROD APPX2 MMRP.pdf
• CD-IV ROD APPX3 MOA.pdf
• CD-IV ROD APPX4 FWS.pdf
• CD-IV ROD APP5 AppealForm.pdf

 

Resource Analysis

Resource	Not Present	Present, Not Affected	Present, Potentially Affected	Not Indicated	Comment	Applicant Proposed Mitigation	Agency Imposed Mitigation

Air Quality "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

Close1. AQ-1: ORNI 50, LLC will apply water during the construction and utilization of pads and access roads as necessary to control dust. Dust will not be discharged into the air for a period or periods aggregating more than three minutes in any one-hour that is as dark or darker in shade as that designated as No. 1 on the Ringelmann Chart. 2. AQ-2: ORNI 50, LLC will also comply with any requirements prescribed by the GBUAPCD concerning emissions of air pollutants from construction engines or hydrogen sulfide from operating geothermal wells. The drilling rigs will be registered in the CARB Portable Engine Registration Program. 3. AQ-3: ORNI 50, LLC will utilize best available equipment and design to minimize emissions of n-pentane. 4. AQ-4: ORNI 50, LLC will apply for an air permit to construct and operate the wells and power plant. The Project will conform to GBUAPCD requirements for controlling emissions.

CloseMitigation Measure AQ-1: ORNI 50, LLC shall develop and implement a plan that demonstrates that the mobile off-road equipment (more than 50 horsepower) to be used in the Proposed Action (i.e., owned, leased, and subcontractor vehicles) would achieve a Project wide fleet-average 20 percent NOx reduction compared to the most recent CARB fleet average. The plan shall be approved by GBUAPCD prior to the commencement of construction activities. Acceptable options for reducing emissions include the use of late model engines, low-emission diesel products, alternative fuels, engine retrofit technology, after-treatment products, and/or other options as they become available. Mitigation Measure AQ-2: ORNI 50, LLC shall require that all drill rig engines meet either USEPA and CARB Tier 2 or higher emissions standards for off-road engines. Prior to commencement of drilling, ORNI 50, LLC shall provide documentation to GBUAPCD that demonstrates that each drill rig will be equipped with Tier 2 and Tier 3 engines. Mitigation Measure AQ-3: ORNI 50, LLC shall develop a fugitive dust control plan to be implemented during construction of the Proposed Action. The plan shall be submitted to the GBUAPCD for review and approval prior to the commencement of construction activities. The plan shall include, but not be limited to the following dust control measures: � All on-site unpaved roads and off-site unpaved access roads shall be effectively stabilized to control dust emissions using water. � All ground disturbance, including land clearing, grubbing, scraping, excavation, grading, and cut & fill activities shall effectively control fugitive dust emissions by utilizing application of water or by presoaking. � Limit traffic speed on unpaved access roads to 15 mph and post visible speed limit signs at construction site entrances. � Suspend excavation and grading activity when gusts produce wind speeds exceeding 20 mph. � Reduce land disturbance activities as much as possible so that natural, stable soil conditions remain. � The plan shall include provisions for monitoring fugitive dust based on the requirements of PDM AQ-1, and if the requirements identified in PDM AQ-1 are exceeded, construction activities shall cease until it can be determined that the requirements can be achieved. Mitigation Measure AQ-4: ORNI 50, LLC shall monitor H2S concentrations during all well drilling and testing at GBUAPCD-approved locations for each well location. If the well H2S emissions exceed 2.5 kg/hr or the State�s H2S ambient air quality standard for one hour is exceeded, further venting will be curtailed until an H2S abatement plan, approved by the GBUAPCD, is implemented to reduce H2S well emissions below 2.5 kg/hr and the ambient concentrations below the State standard of 0.03 parts per million. The plan shall include (1) a description of the abatement technology, the degree of control expected from such technology, and the test data indicating that such degree of control can be expected in a geothermal well application; and (2) air quality analysis showing that the use of such abatement technology will not result in any violation of the State ambient air quality standard for H2S. Mitigation Measure AQ-5: ORNI 50, LLC shall prepare and implement an Emission Management Plan for review and approval by the GBUAPCD Air Pollution Control Officer, which shall contain the following: � A description of the method to determine the daily n-pentane volume in the plant. � An explanation of how to calculate n-pentane loss rates over a given period. � An action plan for detecting and reporting breakdown events under GBUAPCD Rule 403.B, when n-pentane leaks emit more than 410 pounds per day. � An action plan for repairing leaks associated with breakdown events. A maintenance plan for routine monitoring and prevention of n-pentane leaks. � A format for quarterly reports on n-pentane losses and purchases. The Emissions Management Plan shall be updated as necessary in order to ensure compliance with federal, state, and/or district rules and to incorporate management plan improvements if necessary. Mitigation Measure AQ-6: ORNI 50, LLC shall obtain a portable Volatile Organic Compound (VOC) leak detector capable of meeting the performance specifications described in USEPA's Source Test Reference Method 21. This instrument shall be properly maintained, calibrated, and made readily available at all times on the property site. The instrument shall be used at least on a monthly basis to assist ORNI 50, LLC personnel in detecting n-pentane leaks from all flanges, valves, pump seals, safety relief valves, n-pentane accumulator vessels, and turbine gland seals. Whenever a leak is detected that is greater than 10,000 ppmv from any aforementioned equipment, ORNI 50, LLC shall initiate repairs as soon as practical. Once a leak is discovered, ORNI 50, LLC shall tag and log its location, record the leak concentration, record the date, and record the dates of each repair attempt. A report that includes the six-month average daily emission calculations and n-pentane purchases shall be submitted electronically to the GBUAPCD within 30 days from the end of each calendar quarter. A summary record of the leak repairs made shall also be submitted to the GBUAPCD when reporting n-pentane losses.�

Vegetation "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseBIO-2: After construction is complete, erosion control measures including revegetation and periodic maintenance activities will be implemented. Disturbed areas that will not be used after construction will be revegetated with the proper seed mixture and planting procedures prescribed by the USFS. Any topsoils enriched in organic material stockpiled from previously disturbed areas (see GEO-1) may be applied to enhance areas to be reclaimed by revegetation.

CloseRevegetation of Temporarily Disturbed Areas. Per PDM BIO-2, ORNI 50, LLC shall prepare and implement a Revegetation Plan to restore all areas subject to temporary disturbance to pre-Project grade and conditions. The Revegetation Plan will not be implemented until it is approved by an Inyo NF botanist who is familiar with the project environment and the District Ranger. Temporarily disturbed areas within the Project area include, but are not limited to: the transmission line corridor, construction staging areas for well pad sites, and temporary access roads. The Revegetation Plan shall include a description of topsoil salvage and seeding techniques and a monitoring and reporting plan. The following success standards shall be met at the end of the third growing season following seed application. a. Success standards for revegetation in the Jeffrey pine forest are as follows: i. At least 1 tree, 1 shrub, and 6 perennial native grasses and/or forbs per 4 square meters will be established on site. ii. Perennial grasses will account for at least 10 percent of the relative cover. iii. All non-native weed species that are already present in the area will account for no more than 5 percent total of the relative cover at the end of a three year evaluation period. New non-native species introduced as a result of the Project will be eradicated (i.e., 0 percent cover). b. Success standards for revegetation in the Sagebrush Scrub are as follows: i. At least 3 shrubs and 8 perennial native grasses and/or forbs per 4 square meters will be established on site. ii. Perennial grasses will account for at least 10 percent of the relative cover. iii. All non-native weed species that are already present in the area will account for no more than 5 percent total of the relative cover at the end of a three year evaluation period. New non-native species introduced as a result of the Project will be eradicated (i.e., 0 percent cover). 5. Landscaping. Any vegetation planted for landscaping or visual shielding purposes shall be reviewed by USFS personnel prior to installation.

Invasive, Nonnative Species "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseBIO-3: During construction, prior to entering and upon exiting the Project area, all trucks and construction equipment that will operate off of previously existing roads shall be washed to remove soil and plant parts. A central washing facility will be provided for this purpose, either at equipment area at the ORNI 50, LLC equipment area at Casa Diablo on private land, or at a location approved by the authorized officer. BIO-4: All materials used in erosion control and/or rehabilitation efforts (e.g. straw bales, seeds, etc.) on the Project will be certified as being free of noxious weed materials. BIO-5: New non-native species introduced as a result of the Project, will be eradicated (i.e., 0 percent cover). Where this standard is not met, appropriate weed control measures will be implemented in order to comply with the standard for a period of three years following Project completion. (This measure is supplemented by Mitigation Measure VEG-2 � see Section 4.3.9 below) BIO-6: With the exception of cheatgrass, all non-native weed species already present in the Project area will account for no more than 5 percent total of the relative cover of the disturbed areas, including roadsides at the end of a 3-year evaluation period following completion of revegetation measures. Weed control will be implemented immediately following implementation of the Project, and throughout the Project life to meet this standard. BIO-7: Cheatgrass is largely absent from the forested portions of the Project area. In order to maintain this condition, cheatgrass will be removed from all areas where ground disturbance occurs west of drill sites 56-25, 57-25 or 58-25. Appropriate weed control measures will be implemented as necessary, in order to prevent the invasion and spread of cheatgrass, throughout the life of the Project, and for a period of three years following Project completion.

CloseLimit Disturbance Areas. The boundaries of all disturbed areas (including staging areas, access roads, and sites for temporary placement of spoils) shall be delineated with stakes and flagging prior to construction activities. Spoils and topsoil shall be stockpiled in disturbed areas lacking native vegetation that do not provide habitat for special-status species. The stockpiles shall not be placed in areas with existing weed populations. All disturbances, CD-IV Project vehicles and equipment shall be confined to the flagged areas. All personal vehicles shall be parked off-site or at existing MPLP facilities. All above ground pipelines and transmission lines shall be installed using low pressure tracked equipment to minimize impacts on vegetation. Understory vegetation and surface soils may be trampled during pipeline and transmission line installation but not removed. All Jeffrey pine trees in the installation routes outside of the footprint of the power plant site and the well pad sites shall be preserved where feasible. For construction activities outside of the plant site (transmission line, pipeline alignments, well pad sites) access roads, pulling sites, and storage and parking areas shall be designed, installed, and maintained with the goal of minimizing impacts to native plant communities and sensitive biological resources. Mitigation Measure VEG-2: Weed Management Plan. ORNI 50, LLC shall implement a Weed Management Plan that meets the approval the USFS. The objective of the Weed Management Plan shall be to prevent the introduction of any new weeds and the spread of existing weeds as a result of Project construction, operation, and decommissioning. The Weed Management Plan shall include at a minimum the following information: specific weed management objectives and measures for each target non-native weed species; baseline conditions; a map of existing weed populations; weed risk assessment and measures to prevent the introduction and spread of weeds; monitoring and surveying methods; and reporting requirements. The Weed Management Plan shall include specific implementation requirements for each phase of the Project. The Plan would be consistent with USFS practices and would be implemented by ORNI 50, LLC to reduce the potential for the introduction of invasive species during construction, operation and maintenance, and decommissioning of the CD-IV Project. The draft plan would be reviewed and approved by the USFS. The following measures are required in the Plan and would be implemented by ORNI 50, LLC to monitor and control invasive species: 1. Preventative Measures During Construction. Equipment Cleaning: To prevent the spread of weeds into new habitats prior to entering the Project work areas, construction equipment and personal vehicles shall be cleaned of dirt and mud that could contain weed seeds, roots, or rhizomes. Equipment shall be inspected to ensure it is free of any dirt or mud that could contain weed seeds and the tracks, feet, tires, and undercarriage shall be carefully washed, with special attention paid to axles, frame, cross members, motor mounts, underneath steps, running boards, and front bumper/brush guard assemblies. Other construction vehicles (e.g. pick-up trucks) and vehicles from different areas of the Project that frequently enter and exit the site shall be inspected and washed on an as-needed basis. A vehicle log shall be maintained at the washing facility to document vehicle cleaning. a. All vehicles shall be washed off-site when possible. Should off-site washing prove infeasible, an on-site cleaning station shall be set up to clean equipment before it enters the work area. Either high-pressure water or air shall be used to clean equipment and the cleaning site shall be situated away from any sensitive biological resources. If possible, water used to wash vehicles and equipment shall be collected and re-used. Before re-using the vehicle wash water, any vegetative matter or soil should be removed. b. Site Soil Management: Ground disturbance shall be limited to the minimum necessary for construction activities, using dust suppressants to minimize the spread of seeds. Disturbed vegetation and topsoil shall be re-deposited at or near the removal area to eliminate the transport of soil-borne noxious weed seeds, roots, or rhizomes. Areas of topsoil removal should be surveyed for weeds pre-project. If weeds are present, topsoil should not be re-used for revegetation purposes. BLM-approved dust suppressants (e.g. water) shall be minimized on the site as much as possible, but shall be used during construction to minimize the spread of airborne weed seeds, especially during very windy days. c. Weed-free Products: Any use of hay or straw bales on the Project site shall be limited to certified weed-free material. Other products such as gravel, mulch, and soil may also carry weeds and these products, too, shall be certified weed-free. If needed, mulch shall be made from the local, on-site native vegetation cleared from the Project area. Soil shall not be imported onto the Project site from off-site sources. 2. Containment and Control Measures. When Project monitoring (see below) indicates that invasive species are spreading, invasive species shall be removed using mechanical or effect on native plant species. Chemical control is not included as part of these containment and control measures because site specific information on target weed species are not known at this time. 3. Monitoring. Baseline weed conditions shall be assessed during the pre-construction phase of the CD-IV Project, during pre-construction surveys and staking and flagging of construction areas. A stratified random sampling technique shall be used to identify and count the extent of weeds on the site. Monitoring shall take place each year during construction, and annually for the lifespan of the Project following the completion of construction. The purpose of annual monitoring shall be to determine if weed populations identified during baseline surveys have increased in density or are spreading as a result of the CD-IV Project. With the exception of cheatgrass, all non-native weed species already present in the Project area will account for no more than 5 percent total of the relative cover of the disturbed areas, including roadsides. Control methods shall be implemented when measurable weed increases or visually verified increases occur that span two or more consecutive years of monitoring results collected at the end of the growing season. General management and monitoring of the Project area shall be conducted by designated site personnel each year during both the germinating and early growing season to eliminate new weed individuals prior to seed set. The early growing season for weedy annuals is February or March in the warmest zones of the thermally disturbed habitat, and from April to June outside of thermally disturbed habitat. Throughout construction and long-term monitoring, personnel shall be trained to identify weedy and native species and work with a trained vegetation monitor to determine where elimination is necessary. 4. Reporting. Results of monitoring and management efforts shall be included in annual reports. Copies of these reports shall be kept on file at the site. Copies of each annual report shall be sent to the BLM and USFWS for review and comment. BLM and USFS shall use the results of these reports to determine if any additional monitoring or control measures are necessary. 5. Success Criteria. Weed control shall be ongoing on the Project site for the life of the CD-IV Project, but plan success shall be determined by BLM and USFS after three years of operations monitoring through the reporting and review process. Success criteria shall be defined as the following: a. non-native weed species that are already present in the area shall account for no more than 5 percent total of the relative cover at the end of a three year evaluation period. b. New non-native species introduced as a result of the Project shall be eradicated (i.e., 0 percent cover). Mitigation Measure VEG-3: This mitigation measure shall modify PDMs BIO-5, BIO-6, and BIO-7: All weed monitoring and weed control remediation efforts shall commence at the start of construction activities and shall continue for the duration of the permit.

Water Quality Surface and Ground "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseHYD-1: Appropriate erosion control measures will be used to control any offsite discharges, and the Project will adopt any relevant LRWQCB and USFS best management practices to prevent soil erosion, including the preparation of a SWPPP. HYD-2: To the extent possible, the pipeline route and any access roadways shall be located outside of any riparian conservation areas delineated by the USFS. HYD-3: Existing roads will be evaluated and properly graded and repaired in areas that show evidence of enhanced erosion. HYD-4: Exposed, disturbed soils in construction areas will be watered to minimize wind erosion and dust. Topsoil piles will be covered to minimize erosion during wind storms. See also AQ-1. HYD-5: A site drainage and runoff management plan will be prepared. All new access roads will comply with the plan to minimize erosion and off-site sedimentation. Off-site stormwater will be intercepted in ditches and channeled around the well sites to energy dissipaters as necessary to minimize erosion. HYD-6: The pipeline route will not be cleared or graded to minimize soil disturbance. HYD-7: The Project will obtain coverage under, and comply with, the California Construction General Storm Water Permit. Containment of Geothermal Fluids HYD-8: The well bores will be cased with steel casing to prevent interzonal migration of the fluids, protect groundwater, and reduce the possibility of uncontrolled well flow (“blowouts”). HYD-9: Containment basins/sumps constructed at each drill site for the containment and temporary storage of all drilling fluid, drilling mud and cuttings and stormwater runoff shall be constructed to meet RWQCB requirements. Upon completion of drilling activities, the solids remaining in the pit will be dried and tested in accordance with the requirements of the SWRCB Water Quality Order No. 2003-0003 – Statewide General Waste Discharge Requirements for Discharges to Land with a Low Threat to Water Quality or the project-specific requirements of the LRWQCB and, if authorized by the Regional Water Quality Control Board, USFS and BLM, buried in the pit. HYD-10: The power plant site will be constructed to prevent offsite discharge from accidental spills of geothermal fluid, binary working fluid, or other materials stored or used on the site. The plant and well pads will be designed so that spills will be contained on-site. HYD-11: Isolation valves will be located within the pipeline to prevent any backflow of geothermal fluid, should a pipeline rupture or major leak occur. HYD-12: In-line sensing equipment and automatic shutdown controls will be installed to detect pipeline leaks or ruptures and shut-in the wells in the event of an electric failure or detected sudden drop in pipeline pressure. HYD-13: Ormat shall prepare and implement a “Spill or Discharge Contingency Plan” and “Well Blowout Contingency Plan” to prevent, control, contain, clean up and mitigate the impacts of any large spills of geothermal fluid.

CloseMitigation Measure SW-1: Comprehensive Site Drainage and Runoff Management Plan (Drainage Plan). According to PDM HYD-5, the Applicant would prepare a Drainage Plan. Additionally, the Applicant shall ensure that the Drainage Plan adheres to the following: The Applicant shall prepare and submit to the LRWQCB, BLM and USFS for review the Drainage Plan that shall encompass all proposed facilities. The Drainage Plan shall evaluate potential changes in stormwater flow that would result from implementation of the Proposed Action, to the extent required to determine implementation of appropriate measures to minimize, avoid, retain, or otherwise prevent increases in stormwater runoff from leaving the site and minimize potential for associated erosion or sedimentation. The Drainage Plan shall also delineate location and sizing for proposed stormwater retention facilities, on-site drainages, and other required facilities as warranted to ensure that proposed stormwater facilities are sized appropriately. All stormwater and drainage facilities shall be sized to ensure that the implementation of the Proposed Action would result in no net increase in stormwater discharge from the site during at least a 20-year, 24-hour storm event. With respect to decommissioning, a drainage plan will be included in the reclamation plan, which will be submitted to relevant agencies for approval prior to the initiation of the decommissioning process. This will ensure that final post-decommissioning grading reflects natural site contours and minimizes potential for concentration of stormwater flows, erosion, and sedimentation. All proposed facilities shall comply with the all aspects of the Drainage Plan as indicated here and in PDM HYD-5, including existing and new/proposed access roads and roads that would be plowed during the winter due to proposed operations. Mitigation Measure SW-2: To ensure that sediment and other pollutants contained in the proposed well construction period containment basins/sumps would not be released into downstream waters, the Applicant shall ensure that all containment basins/sumps are constructed so as to be able to contain anticipated drill cuttings, drilling mud, other drilling liquids, and on-site flows anticipated from a 100-year event with at least one foot of freeboard to prevent overtopping. Upon completion of drilling activities and disposal of drill cuttings, all containment basins/sumps shall be backfilled and graded to match natural topography. Mitigation Measure SW-3: Following well completion, in the event that coverage under the Statewide General Waste Discharge Requirements for Discharges to Land with a Low Threat to Water Quality cannot be acquired in support of disposal of drill cuttings, the Applicant shall remove all drill cuttings from each well site where on-site disposal is not available. Removed drill cuttings shall be disposed of in a landfill or other facility approved to accept hazardous wastes (or in accordance with classification of drill cutting waste from the site), in accordance with local and state law. Remaining pits on-site shall be filled and graded to match natural conditions. Mitigation Measure SW-4: During well testing, the Applicant shall ensure that all storage tanks and piping for geothermal fluid storage and conveyance at the well pad site would be contained within a temporary facility that would contain spilled fluid on-site. Containment structures may include berms, containment basins, sumps, or other structures with sufficient capacity to contain the maximum volume of geothermal fluid stored on-site, with sufficient freeboard to prevent accidental release. Mitigation Measure SW-5: Prior to the initiation of operations, the Applicant shall ensure that the proposed spill containment facilities at the power plant site incorporate measures to prevent the infiltration to groundwater of spilled fluids at the plant site, including geothermal fluid and n-pentane. The capacity of the proposed containment facilities shall be equal to at least twice the volume of the entire fluid contents of the power plant facility, including pipeline capacity and the amount that would flow onto the site until automatic shutdown devices would stop the flow. Spill containment facility design shall be reviewed by the USFS and BLM prior to the initiation of construction activities for the power plant. Mitigation Measure SW-6: During Project operation, the applicant shall ensure that equipment and vehicles are routinely inspected for fluid leaks. Equipment and vehicles shall be maintained so as to prevent equipment leaks from infiltrating into soils or being washed off-site during storm events. When discovered, the applicant will repair fluid leaks prior to use on the Project site. If fluids do leak onto the Project site, contaminated soil will be removed immediately and disposed of at an approved facility, in accordance with federal, state, and local requirements. Mitigation Measure SW-7: This mitigation measure shall modify PDM HYD-2 – To the extent feasible, the pipeline route and any access roads shall avoid RCAs. Any additional action, requirements, and/or designations with respect to RCAs shall be based upon guidance from USFS staff and consistent with the relevant USFS policy.

Soils "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseMinimize Road Impacts. New and existing roads that are planned for construction, widening, or other improvements shall not extend beyond the flagged impact area as described above. All vehicles passing or turning around would do so within the planned impact area or in previously disturbed areas. Where new access is required outside of existing roads or the construction zone, the route shall be clearly marked (i.e., flagged and/or staked) prior to the onset of construction. Implement Erosion Control Measures. Standard erosion control measures shall be implemented for all phases of construction and operation where sediment run-off from exposed slopes threatens to enter "Waters of the State". All disturbed soils and roads within the Project site shall be stabilized to reduce erosion potential, both during and following construction. Areas of disturbed soils (access and staging areas) that slope toward a drainage shall be stabilized to reduce erosion potential. Water used for dust suppression purposes will not come from Casa Diablo power plant geothermal injection fluids.

Range Resources "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseGrazing. The USFS will ensure that grazing in the Sherwin/Deadman Sheep and Goat Allotment avoids active or revegetation monitoring areas in Basalt Canyon and Upper Basalt Canyon, as required by the Revegetation Plan (see Mitigation Measure VEG-1.4, above). Mitigation Measure GRZ-1: To facilitate livestock management, upon submission of the Facility Utilization Permit, the USFS Authorized Officer would review the affected grazing allotments and recommend appropriate locations for additional under-crossings, if any, in any continuous segment of above-ground pipeline extending one-half mile or longer. Mitigation Measure GRZ-2: The USFS may seek reimbursement from the geothermal lessee for the permanent loss of 15.3 acres of grazing habitat and for the costs of implementing the livestock escape management plan if it is demonstrated that the lessee’s Project operations directly result in stray livestock. The USFS Authorized Officer would coordinate with the Term Grazing Permittee to mitigate the loss.

Wildlife Resources "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseBIO-1: A qualified wildlife biologist will walk the pipeline route once each year for the first three years following completion of construction to survey for any signs that the pipeline is impeding wildlife movement. If such evidence is found, the USFS may require ORNI 50, LLC to clear one or more areas under the pipeline of at least 16 inches height, or sufficient to allow wildlife to pass under the pipeline, at the points where movement is impeded. BIO-2: After construction is complete, erosion control measures including revegetation and periodic maintenance activities will be implemented. Disturbed areas that will not be used after construction will be revegetated with the proper seed mixture and planting procedures prescribed by the USFS. Any topsoils enriched in organic material stockpiled from previously disturbed areas (see GEO-1) may be applied to enhance areas to be reclaimed by revegetation.

CloseMitigation too long to paste. Please refer to EIR/EIS.

Noise "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseNOI-1: Mufflers will be used on all drilling rig engines. NOI-2: Construction noise will be minimized through operational practices which avoid or minimize those practices which may typically generate greater noise levels, or generate distinctive impact noise. NOI-3: Prior to commencing any construction activity associated with the Project, Ormat will submit, and secure the approval of the USFS, a program designed to adequately respond to noise complaints. As part of the program, Ormat will publish a telephone number for use by individuals for the lodging of complaints or inquiries regarding the level of noise from construction operations. A designated representative of the permittee will be available 24 hours a day to record any lodged complaints or inquiries, and Ormat will make reasonable efforts to investigate and respond to any such complaint or inquiry within 24 hours of the complaint or inquiry. Ormat will record each lodged complaint or inquiry, and the results of its investigation and response, on a form, a copy of which will be delivered to the BLM and USFS staff designated to receive these forms within 24 hours of the complaint or inquiry.

CloseMitigation Measure NO-1: ORNI 50, LLC shall prepare and implement a Noise Management Plan to ensure that operational noise levels associated with CD-IV Project well pumps do not increase ambient noise levels at Shady Rest Park by more than 3 dBA. The plan shall be submitted to USFS for review and approval prior to the commencement of well pump operations. The plan shall include a proposal designed by an acoustical engineer to perform baseline noise measurements at Shady Rest Park at locations developed through consultation with USFS and the Town of Mammoth Lakes. The plan shall include a requirement for an acoustical engineer to collect additional measurements at the same locations as the baseline survey once the well pumps are operational to verify that well pump noise levels do not increase ambient noise levels by more than 3 dBA. The plan shall identify specific acoustical engineer-recommended measures to be implemented by ORNI 50, LLC in order to reduce noise levels to within 3 dBA of baseline conditions if the measurements that include pump operations exceed the baseline measurements by more than 3 dBA. Noise control techniques may include, but not be limited to: locating the well pump within an enclosed concrete building, use of noise walls or equivalent sound attenuation structures, and the use of pumps and equipment with special noise control specifications designed to specifically achieve the desired noise reductions. The plan shall require an acoustical engineer to take additional noise measurements after the noise reduction improvements are implemented to ensure the required noise level is met. In the event that the measured noise levels still exceed the baseline level by more than 3 dBA, additional noise control techniques shall be initiated to correct the violation.

Cultural Resources "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseCUL-1: All grading and site construction activities will avoid all cultural resource sites identified in the cultural resource survey report prepared for the Project areas. If identified cultural resource sites cannot be avoided, ORNI 50, LLC will comply with all requirements of the BLM, USFS, and the SHPO prior to any grading or site construction activities that will affect the cultural resources. CUL-2: If buried cultural deposits are discovered during site construction activities which were not identified in earlier cultural resource clearances for the Project, grading and site construction activities in the vicinity of the cultural deposit will be evaluated by an Inyo National Forest archaeologist, BLM archaeologist, or by a cultural resource specialist pursuant to the requirements of SHPO. CUL-3: ORNI 50, LLC employees, contractors, and suppliers will be informed about the sensitivity of the cultural resources in the Project area and reminded that all cultural resources are protected and, if uncovered, shall be left in place and reported to the ORNI 50, LLC representative and/or their supervisor.

CloseMitigation Measure CUL-1: A MOA shall be prepared and shall detail: 1) procedures to resolve adverse effects under Section 106; 2) coordination between the CEQA process and Section 106 compliance; 3) procedures for treatment of inadvertent discoveries; 4) procedures for determining treatment and disposition of human remains; 5) compliance monitoring; 6) dispute resolution; 7) development of an Historic Properties Avoidance Plan; and 8) Tribal consultation and participation. Mitigation Measure CUL-2: On the basis of preliminary National Register eligibility assessments made under the MOA, particularly concerning contributing resources to the Casa Diablo Obsidian National Register District, the USFS and BLM may require the relocation of Project components to avoid or reduce damage to cultural resource values. Where operationally feasible, Project redesign shall protect potentially National Register-eligible resources from direct Project impacts within previously surveyed and analyzed areas. Mitigation Measure CUL-3: The CD-IV Project Alternative 3 design of September 19, 2012, was in part developed to avoid historic properties. Where the USFS and BLM decide that National Register-eligible or -listed cultural resources cannot be protected from direct impacts by Project redesign, ORNI 50, LLC shall comply with appropriate mitigative treatment(s) that will be detailed in the MOA. Mitigation Measure CUL-4: A Historic Properties Avoidance Plan shall be developed and included in the MOA that defines and maps all known cultural resources within 150 feet of the Project APE. That Plan shall also detail how resources will be marked and protected as Environmentally Sensitive Areas during construction. The Plan shall detail provisions for monitoring construction in locations deemed to be high-sensitivity areas for buried sites currently without surface manifestations. It shall also detail procedures for halting construction, making appropriate notifications to agencies, officials, and Native Americans, and assessing register-eligibility in the event that unknown cultural resources are discovered during construction. For all unanticipated cultural resource discoveries, the Historic Properties Avoidance Plan shall detail the methods, consultation procedures, and timelines for assessing register-eligibility, formulating a mitigation plan, and implementing treatment. Mitigation and treatment plans for unanticipated discoveries shall be approved by the USFS, BLM, and the SHPO prior to implementation. Mitigation Measure CUL-5: Archaeological monitoring shall be conducted by a qualified archaeologist familiar with the types of historic and prehistoric resources that could be encountered within the APE, and under direct supervision of a principal archaeologist. All cultural resources personnel will be approved by the BLM and USFS. A Native American monitor may be required at culturally sensitive locations specified by the USFS following government-to-government consultation with Indian tribes. The Historic Properties Avoidance Plan shall indicate the locations where Native American monitors will be required and shall specify the tribal affiliation of the required Native American monitor for each location. ORNI 50, LLC shall retain and schedule any required Native American monitors. Mitigation Measure CUL-6: Prior to construction, the BLM will ensure that the boundaries of historic properties for which Project facilities appear to overlap is clearly marked on the ground with wood lathe and flagging set no more than 10 meters apart. Historic properties planned for avoidance and protection shall be designated as Environmentally Sensitive Areas (ESAs). Historic properties that are within 20 meters (65 feet) of the Direct APE will be identified and labeled as ESAs on engineering plans. ORNI 50, LLC will retain a qualified archaeologist to conduct mandatory cultural sensitivity training for all Project staff and contractors prior to construction activities associated with this undertaking. Mitigation Measure CUL-7: In the event of inadvertent discoveries during construction, operation and maintenance, or decommissioning, procedures outlined in the MOA and the HPTP shall be adhered to. At a minimum this shall include: 1) stop work orders in the vicinity of the find’ 2) recordation and evaluation of the find by a qualified archaeologist’ 3) notification of the find to BLM and USFS; 4) and implementation of appropriate treatment measures, such as avoidance or data recovery. Mitigation Measure CUL-8: Following language developed in the MOA, the BLM shall continue to consult with Indian tribes to identify sacred sites, properties of traditional religious and cultural importance, and traditional use areas that might be affected by the CD-IV Project. If such places are identified, the BLM will consult further with tribes to resolve access impediments or other identified impacts.

Geology and Minerals "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseGEO-4: ORNI 50 LLC commits to continuing to operate the existing geothermal projects in conformance with the Plans of Operation for Development, Injection and Utilization, approved by the BLM and USFS, as well as in conformance with monitoring through the Long Valley Hydrologic Advisory Committee, and remedial action programs, which are designed to prevent, or mitigate, potential hydrothermal impacts to the Owens tui chub critical habitat, Hot Creek Hatchery and Hot Creek Gorge springs from geothermal operations conducted on federal geothermal leases in the Mono-Long Valley KGRA. ORNI 50 LLC also commits to operating the proposed geothermal project in conformance with these requirements. Natural Hazards GEO-5: The CD-IV plant will be constructed to handle the maximum credible earthquake in the Project area. The power plant and all Project construction will comply with Seismic Zone D standards, the most stringent under the IBC. GEO-6: The CD-IV power plant and pipelines will be designed and constructed to reasonably minimize the potential for failure or rupture in the event of fault offset in these zones. GEO-7: The emergency contingency plans will include actions to be taken in the event responsible agencies declare a volcanic hazard warning or alert, or in the event of a volcanic eruption.

CloseMitigation Measure GEO-1: Soil Erosion Control Plan Review and Approval. Project design measures HYD-1, HYD-3, and HYD-5 should be reviewed and approved by a USFS watershed specialist before implementation. Erosion control and drainage plans for new and existing roads to be utilized for the Project shall be aimed at maintaining to the greatest extent feasible the soil quality objectives contained in the USFS Pacific Southwest Region (Region 5) Watershed and Air Management Manual (Supplement R5-2500-50-2012-1). In developing the plan, ORNI 50, LLC and/or its contractor shall consult with the USFS to determine the appropriate soil quality objective(s) to be met following construction (for temporary construction disturbances), and following decommissioning (for total site restoration). As part of the erosion control and drainage plans, ORNI 50, LLC and/or its contractor shall implement an appropriate combination of BMPs, selected from the USFS Water Quality Management Handbook (R5 FSH 2509.22, Chapter 10, Amendment 2509.22-2011-1), that are necessary to meet or exceed the applicable soil quality objective(s) (i.e., maintain or enhance soil quality and function). Mitigation Measure GEO-2: Soils and Geotechnical Investigation. Prior to issuance of a grading permit or use permit, a qualified California-licensed geotechnical engineer shall prepare and submit to the USFS a final geotechnical investigation that provides recommendations to address seismic safety, including determination of the appropriate IBC Seismic Performance Category for the site, and design requirements for foundations, retaining walls/shoring and excavation. The scope of the geotechnical report shall include the proposed plant site as well as the pipeline route and well sites. The geotechnical investigation shall identify and evaluate the presence of expansive, compressible or liquefiable soils and, if present, shall make recommendations for site preparation or design necessary to avoid or reduce adverse structural impacts. Structural foundations shall not be founded on engineered fill, or on native soil, unless it is demonstrated that the soils would be adequate to support the foundation. A California-licensed geotechnical engineer shall be retained by ORNI 50, LLC to be present on the Project site during excavation, grading, and general site preparation activities to monitor the implementation of the recommendations specified in the geotechnical investigation. When/if needed, the geotechnical engineer shall provide structure-specific geologic and geotechnical recommendations that shall be documented in a report approved by the permitting agency. Mitigation Measure GEO-3: Subsidence Monitoring and Mitigation. The existing subsidence monitoring program conducted by the USGS will be reviewed by the USGS and LVHAC members to ensure adequate subsidence monitoring is conducted for the CD-IV Project. Based on recommendations by the USGS and LVHAC members, the subsidence monitoring program would be expanded to include additional monitoring in the CD-IV Project area and any areas outside the Project area that may be impacted by the expanded geothermal development. If additional subsidence monitoring is deemed necessary, the Project applicant would develop a monitoring plan. The monitoring plan would include subsidence and uplift tolerances for potential impacts to infrastructure and resources, and shall prescribe particular actions (e.g., require discontinued or reduced pumping rates) in the event tolerances are exceeded. Additional monitoring may include installation of new or updated monitoring equipment and use of current methods that can detect small-scale changes (for example utilizing InSAR data or high precision leveling methods). Mitigation Measure GEO-4: Surface Fault Rupture Hazard Investigation. ORNI 50, LLC shall include in PDM GEO-7 a requirement to provide the USFS the results and findings of the surface fault rupture hazard investigation and demonstrate that such findings have been incorporated where necessary into the final layout and design of the CD-IV Project. The Surface Fault Rupture Hazard Investigation shall conform to California Geological Survey Note 49, Guidelines for Evaluating the Hazard of Surface Fault Rupture (CGS, 2002) and shall be prepared and certified by a California-licensed geotechnical engineer.

Lands and Realty "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseLU-1: Geothermal exploration and development projects will be carried out with the fewest visual intrusions reasonably possible (consistent with Mono County Conservation/Open Space Element, Goal I, Objective F). LU-2: Prior to operation of the Project, Ormat will prepare a Site Abandonment-Reclamation Plan in conformance with BLM and USFS requirements. When Project operations are complete, Ormat will restore the site to approximate pre-Project land uses according to the plan requirements.

Fire Resources "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseHAZ-3: All construction equipment will be equipped with spark arresters. All vehicles will be equipped with fire extinguishers and shovels. HAZ-4: Fire extinguishers will be available during all construction activities. Water that is used for construction and dust control will be available for fire fighting. HAZ-5: The power plant will have an emergency fire pump to provide water for fire suppression. HAZ-6: Cooking, campfires, or fires of any kind shall not be allowed. HAZ-7: Personnel will be allowed to smoke only in designated areas, and they will be required to follow applicable Inyo National Forest regulations regarding smoking. HAZ-8: Any special permits required for welding or other similar activities will be applied for through, and received from, the District Ranger before these operations are conducted.

Wastes Hazardous or Solid "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseHAZ-1: ORNI 50, LLC will comply with all local, state, and federal regulations regarding the use, transport, storage, and disposal of hazardous materials and wastes. Its Hazardous Materials Business Plan (HMBP) will be updated to incorporate the new power plant. HAZ-2: N-pentane usage and storage at the CD-IV facility will be incorporated into ORNI 50, LLC’s Risk Management Plan and Process Safety Management program. HAZ-9: ORNI 50, LLC shall prepare an emergency plan to provide guidance to field personnel and management in the event of an uncontrolled well flow, pipeline break or other field related emergency. The plan shall address the various hazards or problems that might be encountered and it specify appropriate preventive or anticipatory actions, equipment requirements, as well as specific responses, notifications and follow up. HAZ-10: ORNI 50, LLC and/or its contractors shall conduct daily routine visual inspections of the construction areas during construction to identify and correct any operational problems that could lead to a hazardous materials release. ORNI 50, LLC operators stationed at the Casa Diablo operations center will continuously monitor the well and pipeline operations through the data transmitted to the center by the well and pipeline monitoring sensor. In addition, these operators will also conduct regular, routine visual inspections of the well sites and pipeline.

CloseMitigation Measure PHS-1: ORNI 50, LLC shall prepare emergency contingency plans, including a Spill or Discharge Contingency Plan, a Hazardous Gas Contingency Plan, and an Injury Contingency Plan, and submit these plans for technical review to the USFS, the BLM, the LVFPD, and the MLFPD prior to construction. The Spill or Discharge Contingency Plan shall be designed to apply to spills or other releases at all proposed facilities where potential water quality pollutants would be utilized or stored, including proposed geothermal fluid pipelines, the power plant, the substation, and other proposed facilities where fuels, oils, and other chemicals may be stored or utilized. In consultation with the local agencies, the BLM and USFS will determine any additional measures that shall be included in the emergency contingency plans and these measures shall be implemented by ORNI 50, LLC. The emergency contingency plans shall include, but not be limited to, the following: 1. Identification of blowout prevention equipment and emergency containment equipment that shall be maintained and readily accessible at all times. Equipment could include construction equipment, water trucks, tanks, and absorbents. 2. Specific procedures to shut-in or control the flow, and appropriate control procedures if the means to control the flow is lost. 3. Specific procedures and equipment to construct sumps, dikes and contain flows, spills or leaks of geothermal fluid, drilling mud, and petroleum products. 4. Hazardous gas monitoring, action levels, and emergency procedures. 5. Identification of emergency response providers and appropriate regulatory agencies to be notified in the event of an emergency. 6. Training of all site personnel and construction workers in emergency contingency procedures described in the plans and maintenance of records of worker training. Mitigation Measure PHS-2: ORNI 50, LLC shall prepare a Fire Protection and Prevention Plan for construction, operation, and maintenance activities. The Fire Protection and Prevention Plan must be submitted to and approved by the Inyo National Forest, the LVFPD, and the MLFPD prior to construction. In consultation with the local agencies, the USFS will determine any additional BMPs that shall be implemented. The Fire Protection and Prevention Plan shall include, but not be limited to, the following: 1. Requirement for the number and size of water trucks equipped with 50 feet of fast response hose with fog nozzles that shall be maintained on-site during construction for immediate response to fire incidents 2. Training of all construction workers on fire prevention methods, the proper use of firefighting equipment and procedures to be followed in the event of a fire. 3. Maintenance of fire extinguishers and fire-fighting equipment at each construction site sufficient to extinguish small fires. 4. Definition of appropriate defensible spaces that shall be maintained around permanent structures for acceptable wildland fire protection There would be no adverse secondary impacts of Mitigation Measures PHS-1 and PHS-2.

Access and Transportation "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseTR-2: Project vehicles will not block Sawmill Road or Sawmill Cutoff Road by either waiting or parking on either road. TR-3: Where the pipeline will be constructed under existing roads by open trench construction and restricting public access, appropriate traffic control measures will be established to warn traffic of temporary road closures. 4. TR-4: For those sections of the pipeline not immediately adjacent to an access road, pipeline construction equipment will “catwalk” over the top of the existing vegetation without removing it to avoid the need to grade the pipeline route or an access road and minimize both ground disturbance and visual impact. Vehicle access to these off-road construction areas will be limited to that specifically necessary for construction. No vehicles will be allowed to turn or drive in any area beyond a 20-foot wide temporary construction corridor along the pipeline route. TR-5: ORNI 50, LLC will attempt to work with the Town of Mammoth Lakes and the USFS to plow the road to and the parking lot at Shady Rest Park in the winter to better accommodate recreational traffic and parking for cross-country skiers and snowmobilers. This plan will provide the majority of the winter access for the new well pads proposed for the Project. TR-6: All vehicle traffic will be restricted to designated access roads. Project-related vehicles will be restricted to travelling no faster than 25 mph on Sawmill Cutoff Road and on other unimproved roads in the project area.

CloseMitigation Measure TRA-1: Prior to construction and/or decommissioning, ORNI 50, LLC shall develop a Coordinated Transportation Management Plan and work with Mono County to prepare and implement a transportation management plan for roadways adjacent to and directly affected by the planned CD-IV Project facilities, and to address the transportation impact of the overlapping construction projects within the vicinity of the CD-IV Project in the region. The transportation management plan shall include, but not be limited to, the following requirements: 1. Coordination of individual traffic control plans for the Project and nearby projects. 2. Coordination between the contractor and Mono County in developing circulation and detour plans that include safety features (e.g., signage and flaggers). The circulation and detour plans shall address: a. Full and partial roadways closures b. Circulation and detour plans to include the use of signage and flagging to guide vehicles through and/or around the construction zone, as well as any temporary traffic control devices c. Bicycle/Pedestrian detour plans, where applicable d. Parking along public roadways e. Haul routes for construction trucks and staging areas for instances when multiple trucks arrive at the work sites f. Repairing and restoring affected roadway rights-of way to their original condition or better after construction and decommissioning are completed, where applicable. 3. Protocols for updating the transportation management plan to account for delays or changes in the schedules of individual projects.

Recreation "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseREC-1: Sections of the pipeline route not located next to existing roads will be monitored for evidence of use by OHVs. If such evidence is found, ORNI 50, LLC will notify the USFS and comply with its requirements for funding or implementation of actions to prevent use by OHVs, such as the posting of signs and the physical blocking of access. REC-2: ORNI 50, LLC will prepare and implement a winter access contingency plan in accordance with the requirements of the USFS. The plan will be designed to ensure that there is at least one location along Sawmill Road which is maintained to provide a safe and easy crossing by cross country skiers. REC-3: For public safety, an appropriate temporary fence will be constructed around each drilling sump/pit when the associated drill site is not continuously staffed by personnel and until the pit is backfilled.

CloseMitigation Measure REC-1: ORNI 50, LLC shall post informational materials about the CD-IV Project at, but not limited to: nearby recreation sites / campgrounds, access points, the Mammoth Lakes Trail System website, and the Mammoth Welcome Center. This material shall include construction schedules and safety information regarding trucks and other heavy equipment use on local roads and NFSRs, and identify route closures. Signage shall be designed to function during winter and non-winter conditions, and shall be consistent with USFS and Town of Mammoth signage requirements, as appropriate. In addition, construction vehicle speed shall be limited to 15 miles per hour; with temporary signage warning construction vehicles to reduce speeds in areas with blind corners, narrow roads, or hills. Mitigation Measure REC-2: ORNI 50, LLC shall monitor all pipeline routes for evidence of OHV use and if such use is identified, further OHV use shall be prevented through posting of signs and the physical blocking of access, or other restriction measures. ORNI 50, LLC shall also monitor revegetation of pipeline alignments and replant vegetation if necessary. Mitigation Measure REC-3: ORNI 50, LLC shall provide information regarding pipeline crossing locations and road closures at, but not limited to: nearby recreation sites / campgrounds, access points, the Mammoth Lakes Trail System website, and the Mammoth Lakes Visitor Center. Signage shall be designed to function during winter and non-winter conditions, and shall be consistent with USFS and Town of Mammoth signage requirements, as appropriate. In addition, operational vehicle speed shall be limited to 15 miles per hour road and signage shall be installed, consistent with USFS and County requirements. ORNI 50, LLC shall also coordinate with the Town of Mammoth and the USFS to ensure that a Shady Rest OSV staging area and access to the staging area is plowed to provide winter access. In addition, banks formed by road plowing shall be shaped such that crossing grade changes are gradual in areas where cross country use is prevalent.

Visual Resources "NEPA_Resource_Analysis" is not in the list of possible values (Not Present, Present, Not Affected, Present, Potentially Affected, Not Indicated) for this property.

CloseVIS-1: Any pipeline route selected within the pipeline corridor will either be located at least 300 feet from the developed portions of Shady Rest Park or will be substantially screened from view from the developed portions of the park by topography or vegetation. VIS-2: In sections of the Project area with a USFS Visual Quality Objective (VQO) of “partial retention” and “retention”, ORNI 50, LLC will, with the approval of the USFS, locate the pipeline so that it is not immediately adjacent to existing roads where possible, and takes advantage of existing vegetation or terrain screening opportunities to reduce the visibility of the pipeline from these roads. VIS-3: The pipeline segments to be constructed (a) in areas with a VQO of “retention” in the vicinity of Sawmill Cutoff Road, and (b) in Inyo National Forest managed-land in areas with the VQO of “retention” and visible from SR 203 and/or U.S. Highway 395 will use texture and color or colors (approved by the authorized officer) selected to blend with the color and texture of the characteristic landscape. VIS-4: All power plant and well pad facilities will be painted a neutral color to blend in with the environment, using a color that was approved and used for the existing Basalt Canyon facilities and/or another color scheme approved by the USFS.

CloseMitigation Measure VIS-1: Landscape Plan. Prior to construction, ORNI 50, LLC shall prepare, submit for approval by the USFS, and implement a landscape plan that includes planting of native trees and shrub vegetation at select locations to further screen well site facilities and the geothermal pipeline from view from Sawmill Cutoff Road (NFSR 03S08), Sawmill Road (03S25), Shady Rest Park, U.S. Highway 395, SR 203, and Knolls Loop. The landscape plan shall be coordinated with the revegetation plan (refer to Mitigation Measure VEG-1) including a monitoring and reporting plan. Permanent fencing shall be precluded to reduce potential barriers to wildlife. To minimize adverse visual effects from the abovementioned roads and park, ORNI 50, LLC shall landscape the following areas such that direct views and corners of the well facilities and pipeline are at least 65% obstructed from any location within a ten-year period. Monitoring at the end of the third growing season shall be conducted to determine if success standards are being met. If it is determined that success standards are not being met, ORNI 50, LLC shall take immediate action to re-implement the Landscape Plan to ensure compliance by the tenth-year period. At the following sites, ORNI 50, LLC shall also surround landscaped sites during construction with dark colored protective fencing: a. The northern side of well facility site 38-25 (near Shady Rest Park) b. Along Sawmill Cutoff Road (NFSR 03S08) (between well facility sites 15-25 and 14-25, and at the pipeline crossing near well facility site 34-25) c. Along Sawmill Road (03S25) (between well facility sites 81-36, 12A-31, 23-31, 35-31, and 55-31) d. At pipeline crossover near Knolls Loop (approximately 700 feet southeast of well facility site 34-25) e. At pipeline crossovers adjacent to Sawmill Road (03S25) and Pole Line Road (NFSR 03S123) (near well facility sites 56-25,66-25, 77-25, 81-36, 12A-31, 23-31, 35-31, and 55-31) Once the locations of proposed crossovers and expansion loops are determined, the need for implementing this measure will be determined. Mitigation Measure VIS-2: Pipeline Crossovers and Expansion Loops. At locations where one pipeline crosses over another adjacent to Sawmill Road (03S25) and Pole Line Road (NFSR 03S123) (near well facility sites 56-25,66-25, 77-25, 81-36, 12A-31, 23-31, 35-31, and 55-31) and where the terrain is not a constraining factor, ORNI 50, LLC shall reduce the height of crossovers and expansion loops by: a. Lowering the existing pipeline or new pipeline (whichever is easiest) belowground or within a 3-foot deep trench and design the pipeline crossover with pairs of 30, 45 or 90 degree ells to ensure that the overall height of the crossover is at or below 5.5 feet aboveground. b. All expansion loops shall be horizontal to minimize overall height of installed pipelines to less than 5.5 feet aboveground. Mitigation Measure VIS-3: Power Plant Landscape Plan. Prior to construction, ORNI 50, LLC shall prepare, submit for approval by the USFS, and implement a landscape plan that includes planting of native trees, shrubs, and perennial vegetation to screen views from Antelope Springs Road (03S05). The landscape plan shall be coordinated with the revegetation plan (refer to Mitigation Measure VEG-1) including a monitoring and reporting plan. ORNI50, LLC shall landscape the area immediately adjacent to Antelope Springs Road and at select locations such that direct views and corners of the power plant are at least 65% obstructed from any location within a ten-year period. Monitoring shall be conducted at the end of the fifth growing season to determine whether success standards are being met. If it is determined that success standards are not being met, ORNI 50, LLC shall take immediate action to re-implement the Landscape Plan to ensure compliance by the tenth-year period.