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1.10 General Application MaterialsPart11
Wheeler Gulch – Phase I ESA Photos Taken: October 18, 2022 13 Photo 25 Photo Direction Tires and boulders in the grassy field within the northeast portion of the Subject Property. N Photo 26 Photo Direction An abandoned power pole on hill within the northeast portion of the Subject Property. N Wheeler Gulch – Phase I ESA Photos Taken: October 18, 2022 14 Photo 27 Photo Direction A monitoring well in north central part of the Subject Property. S Photo 28 Photo Direction A monitoring well in north central part of the Subject Property. S Wheeler Gulch – Phase I ESA Photos Taken: October 18, 2022 15 Photo 29 Photo Direction A Natural Gas Plant to the northwest of the Subject Property. NW Photo 30 Photo Direction Abandoned power infrastructure in the western portion of the Subject Property. S Wheeler Gulch – Phase I ESA Photos Taken: October 18, 2022 16 Photo 31 Photo Direction Abandoned power infrastructure in the western portion of the Subject Property. SE Photo 32 Photo Direction Cement slab and abandoned transformer in the northwest corner of the Subject Property. SE Wheeler Gulch – Phase I ESA Photos Taken: October 18, 2022 17 Photo 33 Photo Direction Active and abandoned power infrastructure near the western edge of the Subject Property. N Photo 34 Photo Direction Gas infrastructure adjacent to the northwest corner of the Subject Property. SW Wheeler Gulch – Phase I ESA Photos Taken: October 18, 2022 18 Photo 35 Photo Direction Excluded area containing an oil/gas well pad and infrastructure within the northwest corner of the Subject Property. NE Photo 36 Photo Direction Gate and broken culvert in the northwest portion of the Subject Property. N Wheeler Gulch – Phase I ESA Photos Taken: October 18, 2022 19 Photo 37 Photo Direction Bucket of unknown sludge near the center of the Subject Property SW Wheeler Gulch Solar Project This page intentionally left blank. Wheeler Gulch Solar Project I Glare Analysis Wheeler Gulch Solar Project This page intentionally left blank. FORGESOLAR GLARE ANALYSIS Summary of Results No glare predicted PV Array Tilt Orient Annual Green Glare Annual Yellow Glare Energy ° ° min hr min hr kWh PV array 1 SA tracking SA tracking 0 0.0 0 0.0 - PV array 2 SA tracking SA tracking 0 0.0 0 0.0 - Total annual glare received by each receptor; may include duplicate times of glare from multiple reflective surfaces. Receptor Annual Green Glare Annual Yellow Glare min hr min hr Route 1 0 0.0 0 0.0 OP 1 0 0.0 0 0.0 Project: Wheeler Gulch Solar Ground mount system Site configuration: Untitled Created 30 Jan, 2023 Updated 30 Jan, 2023 Time-step 1 minute Timezone offset UTC-7 Site ID 83287.14707 Category 5 MW to 10 MW DNI peaks at 1,000.0 W/m^2 Ocular transmission coefficient 0.5 Pupil diameter 0.002 m Eye focal length 0.017 m Sun subtended angle 9.3 mrad PV analysis methodology V2 Page 1 of 6 Component Data PV Arrays Name: PV array 1 Axis tracking: Single-axis rotation Backtracking: None Tracking axis orientation: 180.0° Tracking axis tilt: 0.0° Tracking axis panel offset: 0.0° Max tracking angle: 60.0° Rated power: - Panel material: Smooth glass with AR coating Reflectivity: Vary with sun Slope error: correlate with material Vertex Latitude (°) Longitude (°) Ground elevation (ft) Height above ground (ft) Total elevation (ft) 1 39.482529 -108.106814 5388.74 6.00 5394.74 2 39.483059 -108.102533 5403.94 6.00 5409.94 3 39.481833 -108.101138 5407.63 6.00 5413.63 4 39.480715 -108.101568 5397.17 6.00 5403.17 5 39.479902 -108.103019 5380.76 6.00 5386.76 6 39.481020 -108.103867 5381.25 6.00 5387.25 7 39.481542 -108.103824 5384.04 6.00 5390.04 8 39.482064 -108.103985 5386.05 6.00 5392.05 9 39.481923 -108.106914 5381.57 6.00 5387.57 10 39.482511 -108.106999 5388.05 6.00 5394.05 Name: PV array 2 Axis tracking: Single-axis rotation Backtracking: None Tracking axis orientation: 180.0° Tracking axis tilt: 0.0° Tracking axis panel offset: 0.0° Max tracking angle: 60.0° Rated power: - Panel material: Smooth glass with AR coating Reflectivity: Vary with sun Slope error: correlate with material Vertex Latitude (°) Longitude (°) Ground elevation (ft) Height above ground (ft) Total elevation (ft) 1 39.483058 -108.102529 5403.94 6.00 5409.94 2 39.484648 -108.103876 5409.72 6.00 5415.72 3 39.485774 -108.105995 5415.04 6.00 5421.04 4 39.484698 -108.107464 5399.70 6.00 5405.70 5 39.483936 -108.108376 5389.64 6.00 5395.64 6 39.483190 -108.107100 5387.94 6.00 5393.94 7 39.482511 -108.107014 5387.85 6.00 5393.85 Page 2 of 6 Route Receptors Discrete Observation Point Receptors Name ID Latitude (°)Longitude (°)Elevation (ft)Height (ft) OP 1 1 39.482790 -108.098899 5439.24 6.00 Name: Route 1 Path type: Two-way Observer view angle: 50.0° Vertex Latitude (°) Longitude (°) Ground elevation (ft) Height above ground (ft) Total elevation (ft) 1 39.491049 -108.111076 5481.78 5.00 5486.78 2 39.488996 -108.107514 5477.24 5.00 5482.24 3 39.487373 -108.105197 5464.18 5.00 5469.18 4 39.485717 -108.103437 5436.53 5.00 5441.53 5 39.481544 -108.099618 5419.46 5.00 5424.46 6 39.480550 -108.098545 5412.08 5.00 5417.08 7 39.480020 -108.097472 5399.26 5.00 5404.26 8 39.479722 -108.096313 5382.49 5.00 5387.49 9 39.479424 -108.094296 5368.74 5.00 5373.74 10 39.478993 -108.090992 5360.55 5.00 5365.55 Page 3 of 6 Glare Analysis Results Summary of Results No glare predicted PV Array Tilt Orient Annual Green Glare Annual Yellow Glare Energy ° ° min hr min hr kWh PV array 1 SA tracking SA tracking 0 0.0 0 0.0 - PV array 2 SA tracking SA tracking 0 0.0 0 0.0 - Total annual glare received by each receptor; may include duplicate times of glare from multiple reflective surfaces. Receptor Annual Green Glare Annual Yellow Glare min hr min hr Route 1 0 0.0 0 0.0 OP 1 0 0.0 0 0.0 PV: PV array 1 no glare found Receptor results ordered by category of glare Receptor Annual Green Glare Annual Yellow Glare min hr min hr Route 1 0 0.0 0 0.0 OP 1 0 0.0 0 0.0 PV array 1 and Route 1 Receptor type: Route No glare found PV array 1 and OP 1 Receptor type: Observation Point No glare found Page 4 of 6 PV: PV array 2 no glare found Receptor results ordered by category of glare Receptor Annual Green Glare Annual Yellow Glare min hr min hr Route 1 0 0.0 0 0.0 OP 1 0 0.0 0 0.0 PV array 2 and Route 1 Receptor type: Route No glare found PV array 2 and OP 1 Receptor type: Observation Point No glare found Page 5 of 6 Assumptions Default glare analysis parameters and observer eye characteristics (for reference only): • Analysis time interval: 1 minute • Ocular transmission coefficient: 0.5 • Pupil diameter: 0.002 meters • Eye focal length: 0.017 meters • Sun subtended angle: 9.3 milliradians 2016 © Sims Industries d/b/a ForgeSolar, All Rights Reserved. "Green" glare is glare with low potential to cause an after-image (flash blindness) when observed prior to a typical blink response time. "Yellow" glare is glare with potential to cause an after-image (flash blindness) when observed prior to a typical blink response time. Times associated with glare are denoted in Standard time. For Daylight Savings, add one hour. The algorithm does not rigorously represent the detailed geometry of a system; detailed features such as gaps between modules, variable height of the PV array, and support structures may impact actual glare results. However, we have validated our models against several systems, including a PV array causing glare to the air-traffic control tower at Manchester-Boston Regional Airport and several sites in Albuquerque, and the tool accurately predicted the occurrence and intensity of glare at different times and days of the year. Several V1 calculations utilize the PV array centroid, rather than the actual glare spot location, due to algorithm limitations. This may affect results for large PV footprints. Additional analyses of array sub-sections can provide additional information on expected glare. This primarily affects V1 analyses of path receptors. Random number computations are utilized by various steps of the annual hazard analysis algorithm. Predicted minutes of glare can vary between runs as a result. This limitation primarily affects analyses of Observation Point receptors, including ATCTs. Note that the SGHAT/ ForgeSolar methodology has always relied on an analytical, qualitative approach to accurately determine the overall hazard (i.e. green vs. yellow) of expected glare on an annual basis. The analysis does not automatically consider obstacles (either man-made or natural) between the observation points and the prescribed solar installation that may obstruct observed glare, such as trees, hills, buildings, etc. The subtended source angle (glare spot size) is constrained by the PV array footprint size. Partitioning large arrays into smaller sections will reduce the maximum potential subtended angle, potentially impacting results if actual glare spots are larger than the sub-array size. Additional analyses of the combined area of adjacent sub-arrays can provide more information on potential glare hazards. (See previous point on related limitations.) The variable direct normal irradiance (DNI) feature (if selected) scales the user-prescribed peak DNI using a typical clear-day irradiance profile. This profile has a lower DNI in the mornings and evenings and a maximum at solar noon. The scaling uses a clear-day irradiance profile based on a normalized time relative to sunrise, solar noon, and sunset, which are prescribed by a sun-position algorithm and the latitude and longitude obtained from Google maps. The actual DNI on any given day can be affected by cloud cover, atmospheric attenuation, and other environmental factors. The ocular hazard predicted by the tool depends on a number of environmental, optical, and human factors, which can be uncertain. We provide input fields and typical ranges of values for these factors so that the user can vary these parameters to see if they have an impact on the results. The speed of SGHAT allows expedited sensitivity and parametric analyses. The system output calculation is a DNI-based approximation that assumes clear, sunny skies year-round. It should not be used in place of more rigorous modeling methods. Hazard zone boundaries shown in the Glare Hazard plot are an approximation and visual aid based on aggregated research data. Actual ocular impact outcomes encompass a continuous, not discrete, spectrum. Glare locations displayed on receptor plots are approximate. Actual glare-spot locations may differ. Refer to the Help page at www.forgesolar.com/help/ for assumptions and limitations not listed here. Page 6 of 6 Wheeler Gulch Solar Project J Operation & Maintenance Plan Wheeler Gulch Solar Project This page intentionally left blank. Solar facility Operations and Maintenance Plan 1 Operations and Maintenance Plan The operations and maintenance of the Wheeler Gulch Solar Facility focuses on 5 main areas, Solar Arrays, Inverters, Above-ground conduit, Points of Interconnection, and the Data Acquisition System (DAS). Planned maintenance activities occur on a yearly basis. In addition, remote monitoring of the site and equipment facilitates immediate operational requirements to ensure safety and uptime. Yearly planned maintenance activities focus on the physical inspection of the Facility while performing manufacturer required maintenance. Once a year, 1- 2 operators will be onsite to inspect the entire solar array for broken modules, racking damage, loose racking and module clamps, and electrical connections and wiring. In addition, operators will perform both handheld and aerial InfraRed (IR) inspections on each solar module and wire connections to ensure correct operating temperatures. As conditions warrant, washing of the solar panels may be done to maintain peak performance. These types of physical inspections occur for each of the 5 main areas of the Facility as mentioned above. Normal operations will not require personnel to be onsite. Continuous observation of the facility will be conducted by remote monitoring technology. Remote monitoring serves a dual purpose in the daily operations of the Facility. First, remote monitoring ensures the Facility is operating safely and within the engineered criteria. Remote monitoring will allow both Caerus and the utility to immediately and safely shutdown if the Facility operates outside the normal operating parameters. In these rare cases of unexpected operation outside design criteria, 1-2 operators will be sent to site immediately to assess the state of the Facility and verify it is in a safe state. Once the Facility is verified to be in a safe state, operators will begin identifying corrective actions. This type of unplanned outage could last anywhere from a few minutes to hours depending on the cause. In the case of an emergency shutdown, the remote monitoring operator will notify the appropriate authorities in addition to Caerus’ Operations Center which is staffed on a 24x7 basis so that Caerus can dispatch personnel to the site to quickly ensure that there is no hazard or safety concern relating to unplanned outages of the solar equipment. Secondly, remote monitoring allows operators to respond to performance issues in a timely fashion, maximizing the facility’s operational uptime. Performance issues include but are not limited to dirty panels, tracking rack malfunction, inverter errors, network errors, and minor equipment failure. These types of operating activities will require 1-2 operators for a few hours to correct and will likely occur 2 to 4 times a year. An example of a typical Operations and Maintenance scope summary is attached below. 2 Service Descriptions for Preventive Maintenance of Solar Facilities Consult equipment manuals for maintenance activities and intervals as required by the manufacturer. Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit General cleaning General cleaning/vegetation mobilization Cleaning PV array Condition or study dependent Mower/ trimmer N/A Site Array cleaning Array cleaning Cleaning PV array Condition or study dependent Cleaner N/A Acre Snow cleaning Snow removal Cleaning PV module Condition or study dependent Cleaner N/A Acre Dust cleaning Dust removal: agricultural/industrial Cleaning PV module Condition or study dependent Cleaner N/A Acre Pollen cleaning Pollen cleaning Cleaning PV module Condition or study dependent Cleaner N/A Acre Vegetation management Determine if any new objects, such as vegetation growth, are causing shading of the array and move them if possible; remove any debris from behind collectors and from gutters Cleaning PV array As needed Mower/ trimmer N/A Acres Bird cleaning Bird cleaning Cleaning PV array Bi-annual Cleaner N/A Acres 3 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit Battery enclosure cleaning Container or enclosure cleaning Cleaning Battery Condition or study dependent Cleaner N/A Battery bank Contractor response Contractor available by email and phone 24x7x365 Emergency Response PV array Ongoing Administrator N/A System Corrosion inspection Inspect electrical boxes for corrosion or intrusion of water or insects; seal boxes if required Inspection AC wiring Annual Inspector N/A Combiner box AC disconnect switch inspection Check position of disconnect switches and breakers Inspection AC wiring Annual Inspector N/A Disconnect box Protection device inspection Exercise operation of all protection devices Inspection AC wiring Annual Journeyman electrician N/A AC disconnect box inspection AC disconnect box inspection Inspection Electrical Annual Electrician N/A Disconnect box Grounding inspection Test system grounding with "megger"Inspection DC wiring Annual Master electrician N/A Strings Cable inspection Inspect cabling for signs of cracks, defects, pulling out of connections, overheating, arcing, short or open circuits, and ground faults Inspection DC wiring Annual Inspector N/A Strings DC disconnect switch inspection Check proper position of DC disconnect switches Inspection DC wiring Annual Inspector N/A Combiner box inspection Open each combiner box and check that no fuses have blown and that all electrical connections are tight; check for water incursion and corrosion damage; use an infrared camera for identifying loose connections because they Inspection DC wiring Annual Journeyman electrician N/A Combiner box 4 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit are warmer than good connections when passing current Electrical box inspection Look for any signs of intrusion by pests such as insects and rodents; remove any nests from electrical boxes (junction boxes, pull boxes, combiner boxes) or around the array; use safe sanitation practices because pests may carry disease Inspection DC wiring Annual Pest control N/A Inverter inspection Observe instantaneous operational indicators on the faceplate of the inverter to ensure that the amount of power being generated is typical of the conditions; compare current readings with diagnostic benchmark; inspect inverter housing or shelter for physical maintenance required if present. Inspection Inverter (electrical)Annual Inspector N/A Inverter Instrument inspection Spot-check monitoring instruments (e.g., pyranometer) with hand- held instruments to ensure that they are operational and within specifications Inspection Monitoring Annual Inspector N/A String inspection Test open-circuit voltage of series strings of modules Inspection PV array Annual PV module/ array specialist N/A Strings Corrosion inspection Check all hardware for signs of corrosion and remove rust and re-paint if necessary Inspection PV array (mechanical)Annual Inspector N/A Connection 5 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit Array inspection Walk through each row of the PV array and check the PV modules for any damage; report any damage to rack and damaged modules for warranty replacement; note location and serial number of questionable modules Inspection PV array Annual Inspector N/A Acres Mounting system inspection Inspect ballasted, non- penetrating mounting system for abnormal movement Inspection PV array Annual Inspector N/A Rows Hot-spot inspection Use infrared camera to inspect for hot spots; bypass diode failure Inspection PV module Annual Inspector N/A Strings Transformer inspection Inspect transformer, oil and temperature gauges, include housing container, or concrete housing if present Inspection Transformer Annual Master electrician N/A Tracker inspection Check electrical connection and enclosure for tracking motor/controller Inspection Tracker Annual Inspector N/A Controller Electrical connection inspection Check electrical connections Inspection Tracker Annual Inspector N/A Motor Grounding braids inspection Check grounding braids for wear Inspection Tracker Annual Inspector N/A Structure Switchgear inspection Switchgear inspection Inspection Electrical Annual Inspector N/A Transformer Anemometer inspection Anemometer Inspection Inspection Tracker Annual Inspector N/A Driveshaft inspection Driveshaft torque check and visual inspection Inspection Tracker Annual Inspector N/A Driveshaft 6 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit Inclinometer inspection Inclinometer inspection Inspection Tracker Annual Inspector N/A Limit switch inspection Limit switch inspection Inspection Tracker Annual Inspector N/A Block Module table inspection Module table inspection Inspection Tracker Annual Inspector N/A Connection Screw jack inspection Screw jack inspection Inspection Tracker Bi-annual Inspector N/A Block Slew gear inspection Slew gear torque check and wear inspection Inspection Tracker Annual Inspector N/A Slew gear Torque inspection Torque inspection Inspection Mechanical Annual Inspector N/A Block Tracking controller inspection Tracking controller inspection Inspection Tracker Annual Inspector N/A Gear inspection Universal joint inspection, gears, gear boxes, and bearings as required or documented by manufacturer Inspection Tracker Annual Inspector N/A Driveshaft Module torque inspection PV module torque check and visual inspection Inspection Mechanical 5 years PV module/array specialist N/A Rail/fastener Racking torque inspection Racking torque check and inspection Inspection Mechanical 5 years Inspector N/A Structure Galvanization inspection Galvanization inspection Inspection Mechanical Annual Inspector N/A Connection Corrosion inspection Check all hardware for signs of corrosion and remove rust and re-paint if necessary Inspection Battery Annual Inspector N/A Battery bank String inspection Chemistry dependent, test voltage, and resistance at module, cell, and connection level as appropriate Inspection Battery Condition or study dependent Battery specialist N/A Battery bank 7 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit Ventilation inspection Inspect ventilation or air filtration system, replace air filters as needed Inspection Battery Quarterly Inspector N/A Battery bank Visual inspection Visual survey of battery bank to check for cracks in cases, bulging, integrity of battery enclosure, and support structure Inspection Battery Annual Inspector N/A Battery bank Manage operations Daily operations and performance monitoring Management Asset management Ongoing Administrator N/A Manage alarms Monitor alarms and site- specific alert parameters Management Asset management As needed Administrator N/A Manage inventory Manage inventory of spare parts Management Asset management As needed Administrator Monitoring Manage service package Monitoring annual service package Management Asset management Ongoing Administrator Monitoring System Manage O&M services Document all O&M services in a workbook available to all service personnel Management Documents Ongoing Administrator N/A Manage documentation Confirm availability and take any measures to secure operating instructions, warranties and performance guarantees, and other project documentation Management Documents Annual Administrator N/A Manage O&M agreements Review O&M agreements and ensure that services are actually provided Management Documents As needed Administrator N/A Manage preventive services Update record with preventive maintenance services and track any problems or warranty issues and secure the record on site Management Documents Ongoing Administrator N/A 8 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit Meet with site staff Meet with key site staff to continue awareness, question any issues, and report on findings Management Documents Annual Administrator N/A Maintain log Maintain a log of cumulative power delivery (kWh to date) and chart this value against date; chart the value even for uneven or infrequent intervals; explain variation by season or weather Management Meter Monthly Administrator N/A Mobilize electrical labor Electrical labor mobilization Management Electrical Annual Master electrician EPC Site Mobilize mechanical labor Mechanical labor mobilization Management Mechanical Annual Mechanic EPC Site Check central supervisory control and data acquisition (SCADA) Check central SCADA/network manager, include software IT and IT hardware updates as required Management Electrical Annual Network/ IT N/A NCU Re-torque AC connection Re-torque all electrical connections on AC side of system Service AC wiring Annual Journeyman electrician N/A Re-torque combiner box connections Re-torque all electrical connections in combiner box Service DC wiring Annual Electrician N/A Combiner box Replace weather sensors Calibrate or replace weather sensors and meters Service Electrical As per manufacturer Network/ IT N/A Weather station Replace transient voltage surge suppression device Replace transient voltage surge suppression devices Service Inverter As per manufacturer Master electrician Inverter 9 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit Install software upgrades Install any recent software upgrades to inverter programming or DAS and monitoring systems Service Electrical As upgrades become available, maximum 5 years Inverter specialist EPC NCU Dust cleaning from heat rejection fins Clean (vacuum) dust from heat rejection fins Service Inverter Annual Cleaner N/A Inverter Replace air filters Replace any air filters on air-cooled equipment such as inverter Service Inverter As needed Inverter specialist N/A Inverter Remove bird nest Remove bird nests from array and rack area Service PV array Annual Pest control N/A Acres Tracker lubrication Lubricate tracker mounting bearings/gimbals as required by manufacturer Service Tracker Annual Mechanic N/A Gearbox lubrication Lubricate gearbox as required by manufacturer Service Tracker Bi-annual Mechanic N/A Block Screw jack greasing Screw jack greasing as required by manufacturer Service Tracker Bi-annual Mechanic N/A Block Slew gear lubrication Slew gear lubrication as required by manufacturer Service Tracker 3 years Mechanic N/A Slew gear Universal joint greasing Universal joint greasing (zerk fitting) as required by manufacturer Service Tracker Bi-annual Mechanic N/A Driveshaft Re-torque connections Re-torque all electrical connections on battery bank Service Battery Annual Electrician N/A Battery string Watering Watering flooded lead-acid batteries Service Battery (flooded lead- acid only) As per manufacturer Electrician N/A Battery bank Equalizing Perform equalization charge Service Battery (flooded lead- acid only) As per manufacturer Battery specialist N/A Battery bank 10 Service Name Service Description Service Category O&M Category Interval Service Provider Warranty Type Applicable Unit Performance testing Perform performance test: measure incident sunlight and simultaneously observe temperature and energy output; calculate PV module efficiency as a function of temperature and calculate the balance-of- system efficiency; compare readings with diagnostic benchmark (original efficiency of system) Testing Inverter Annual Inspector N/A Overvoltage surge suppressor testing Test overvoltage surge suppressors in inverter Testing Inverter 5 Years Inverter specialist Inverter Inverter Module output testing Test output of modules that exhibit cracked glass, bubble formation oxidation of busbars, discoloration of busbars, or PV module hot spots (bypass diode failure) Testing PV module 5 years Journeyman electrician N/A Modules Module testing Test modules showing corrosion of ribbons to junction box Testing PV module 5 years Journeyman electrician N/A Modules Combiner box inspection DC circuit test and combiner-box inspection Testing Electrical Annual PV module/ array specialist N/A Combiner box Module electrical connection testing PV module electrical connection check Testing Electrical 5 years PV module/ array specialist N/A PV module Grounding hardware testing Check grounding hardware Testing Electrical Annual Master electrician N/A Structure Battery capacity testing Test battery capacity Testing Battery Condition or study dependent Electrician N/A Battery bank Wheeler Gulch Solar Project K Cultural Resources File Search & Review Wheeler Gulch Solar Project This page intentionally left blank. Metcalf Archaeological Consultants, Inc. WeAreMetcalf.com April 5, 2022 Jason Eckman Caerus Oil & Gas, LLC Re: Files Search & Literature Review for 88-acre Proposed Solar Development, in Parachute, Garfield County, Colorado Dear Jason, Metcalf Archaeological Consultants, Inc. (Metcalf) was contacted to assist Caerus Oil & Gas, LLC (Caerus) to complete a cultural resources files search and literature review for a proposed 88-acre solar development along County Road 215 northwest of Parachute (Map 1). The parcel subject to review comprises roughly 88 acres of private land located primarily in Section 33s and 34, in Township 6 South, Range 96 West, 6th prime meridian (Map 1). This letter provides results of a files search conducted using the Office of Archaeology and Historic Preservation’s on-line Compass database on 3/23/2022. Historic topographic Parachute quadrangle (formerly named Grand Valley quad; 1962) was also reviewed for potential historic cultural resources. This research constitutes a formal files search and is valid for 60 days. The files search results included 5 previous inventories and 6 previously recorded resources within or adjacent to the proposed project area. These results are summarized in Table 1 and Table 2, respectively. Table 1 Previous survey adjacent to and overlapping the proposed project area OAHP Doc TITLE/DESCRIPTION INVESTIGATOR TYPE OF SURVEY DATE GF.AE.R197 UNION OIL PARACHUTE CREEK SHALE OIL PROGRAM, PHASE II-CULTURAL RESOURCES STUDY Grand River Institute Block 1983 GF.LM.200 A CULTURAL RESOURCE INVENTORY OF THE UNION OIL COMPANY PROPERTY IN PARACHUTE CREEK, GARFIELD COUNTY, COLORADO Laboratory of Public Archaeology for the Bechtel Corp Block 1975 GF.LM.R851 A CLASS I AND CLASS III CULTURAL RESOURCE INVENTORY FOR THE GRAND VALLEY 3-D GEOPHYSICAL EXPLORATION PROJECT, GARFIELD COUNTY, COLORADO Grand River Institute Linear 2001 MC.LM.R96 GREASEWOOD COMPRESSOR STATION TO PARACHUTE CREEK, A CLASS III CULTURAL RESOURCE INVENTORY ON PHASE I and II OF A PROPOSED PIPELINE FOR COLORADO INTERSTATE GAS COMPANY, RIO BLANCO AND GARFIELD COUNTIES, COLORADO Metcalf Archaeological Consultants, Inc. Linear 1994 GF.LM.R410 CLASS III CULTURAL RESOURCE INVENTORY REPORT FOR LINEAR AND BLOCK AREAS IN STARKLEY AND RILEY GULCHES GARFIELD COUNTY, COLORADO, FOR WILLIAMS PRODUCTION RMT (GRI NO. 2768) Grand River Institute Block, Linear 2007 Table 2. List of cultural resources located within or near the proposed project area. SITE ID SITE NAME/TYPE RESOURCE AGE NRHP STATUS WITHIN OR NEAR 5GF142 Open Camp Prehistoric Not Eligible (Official) Out 5GF143 Riley Gulch Dugout Historic Eligible (Field) Near; 30m outside of boundary 5GF1185 Riley Gulch Rockshelter Prehistoric Eligible (Official) Out; 125m outside of boundary 5GF1186 Open Architectural Protohistoric; Historic Native American Needs Data (Field) Near; 30m outside of boundary 5GF1187 Open Camp Prehistoric Needs Data (Field) Out; 100m outside of boundary 5GF2113 Homestead Historic Not Eligible (Official) In, but destroyed Previous survey overlaps with portions of the 88-acre parcel, primarily in Section 34, but the most recent work was completed 15 years ago which exceeds the typical agency age threshold for validity. One site (5GF2113) is located within the proposed development; however, it has been officially evaluated as not eligible for the NRHP. The site is noted as having been destroyed at the time of recording in 1994 (McDonald and Metcalf 1994). Four NRHP- eligible or needs data sites (5GF143; 5GF1185; 5GF1186; 5GF1187) are located within 125m of the proposed development. Even though the sites are slightly outside of the development boundary, they are likely within the visual or indirect APE and may need to be considered if setting is an aspect that contributes to the eligibility of the resources. The historic topographic map for Parachute (Grand Valley 196) was reviewed for potential historic resources. Aside from the 1962 county road and local road alignments that were reconfigured after 1962, there are two historic buildings and the Low Cost Ditch plotted on the quad likely within the project area that may or may not be extant. Additionally, historic wells or infrastructure may be present. In sum, the results of this files search and literature review indicate: • one previously recorded cultural resource is within the parcel • four eligible or needs data resources outside but within 125m of the development boundary • a moderate potential exists for additional historic-aged resources within the proposed project area. If you have any questions, or need additional information, please do not hesitate to contact me. Sincerely, Kimberly Kintz, M.A., RPA | Principal Investigator Metcalf Archaeological Consultants, Inc. References Cited McDonald, Kae, and Michael D. Metcalf 1994 Greasewood Compressor Station to Parachute Creek: A Class III Cultural Resource Inventory on Phase I of a Proposed Pipeline for Colorado Interstate Gas Company, Rio Blanco and Garfield Counties, Colorado. OAHP Doc #MC.LM.R96. On file at the Office of Archaeology and Historic Preservation. 1994 Site form for 5GF2113. On file at the Office of Archaeology and Historic Preservation. Map 1. 88-acre proposal solar development. Wheeler Gulch Solar Project This page intentionally left blank. Wheeler Gulch Solar Project L Decommissioning Plan Wheeler Gulch Solar Project This page intentionally left blank. Decommissioning Plan Wheeler Gulch Solar Farm Garfield County, Colorado FINAL June 29, 2023 Prepared for: Wheeler Gulch Solar LLC Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | i Contents 1 Introduction .......................................................................................................................................... 1 1.1 Decommissioning Requirements .............................................................................................. 1 1.2 Project Description .................................................................................................................... 1 1.3 Decommissioning Plan Description ........................................................................................... 2 2 Decommissioning Procedures............................................................................................................. 2 2.1 Overview.................................................................................................................................... 2 2.2 General Environmental Protections .......................................................................................... 2 2.3 Pre-decommissioning Activities ................................................................................................ 2 2.4 Decommissioning and Restoration Activities ............................................................................ 2 2.5 Waste Management Procedures ............................................................................................... 4 2.6 Emergency Response and Communications Plans .................................................................. 5 3 Material and Salvage Plan .................................................................................................................. 5 3.1 Material Quantities .................................................................................................................... 6 4 Decommissioning Cost Estimates ....................................................................................................... 6 APPENDIX A: DECOMISSIONING COST BREAKDOWN .......................................................................... 8 Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 1 1 Introduction Wheeler Gulch Solar LLC engaged HDR Engineering, Inc. (HDR) to provide a physical plan to complete decommissioning of the planned Wheeler Gulch Solar Project (Project) and an estimation of the subsequent net decommissioning cost (i.e. the decommissioning cost less salvage value). The Project is expected to consist of a solar photovoltaic (PV) system and a project collector substation located in Garfield County, Colorado (County). This decommissioning plan (Plan) describes the general measures and procedures that should be developed and implemented to decommission the Project and restore the site, and safely dispose of or recycle recovered project materials. 1.1 Decommissioning Requirements This decommissioning plan outlines a typical program for decommissioning the Project at the end of the project life cycle. This Plan describes the general measures and procedures that should be developed and implemented to decommission the site. Before commencing decommissioning activities, the Project’s owner (Owner) at the time of decommissioning will verify with the local, state, or federal agencies any additional requirements and submit a revised plan for approval as required. Per input from Wheeler Gulch Solar LLC, Garfield County is requiring that the Project must submit a decommissioning plan that includes a description of the manner in which the facility will be decommissioned, an estimate of the decommissioning cost in current costs. The Owner will complete the decommissioning of the facility within 12 months of ceasing operations and restore the site within 12 months after completion of decommissioning. 1.2 Project Description The Project is located in Garfield County, CO, on approximately 54 acres of agricultural zoned property and is currently under development in the final design phase. The Project is planned to consist of 10.0 MWac of single-axis tracker solar PV facility and a 34.5 kV to 230 kV project collector substation. The project will interconnect to an existing overhead 230 kV transmission line owned by the Owner. Major features of the Project are outlined below: · Solar PV array consisting of 10.0 MWac of solar power · Single axis steel trackers and racking in a north-south alignment to support the PV panels that allow for east-west rotation · Steel piles to support panels/racks and miscellaneous equipment · DC Collection system (removal up to 3 feet below ground surface elevation as required by decommissioning ordinance) · AC Collection system (removal up to 3 feet below ground surface elevation as required by decommissioning ordinance) · 3 central inverters and corresponding medium voltage transformers rated at 3600 kVA, and associated data collection equipment for metering and monitoring · Interior gravel access roads · On-site project collector substation (to remain after solar decommissioning) The Project is planned to be designed with a project life of 30 years. Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 2 1.3 Decommissioning Plan Description This Plan has been developed to outline typical procedures and considerations for decommissioning the Project. Decommissioning may occur because the project has fulfilled its intended purpose and term, or because it has been abandoned. The costs for eventual removal of project infrastructure and site restoration, are included in this report. 2 Decommissioning Procedures 2.1 Overview As part of decommissioning, the solar project site would be restored to substantially the same physical condition as existed prior to the development of the Project. The decommissioning includes removal of solar project equipment and all site restoration activities noted in this section. All site activities described below will commence after the site has been de-energized and secured. Because decommissioning activities are not anticipated to occur until project end of life, and regulatory requirements may change, any applicable permitting or regulatory requirements would be reviewed with appropriate local and state agencies prior to decommissioning activities to ensure compliance. 2.2 General Environmental Protections During decommissioning activities, general environmental protection measures and all applicable site safety procedures would be implemented as required. Many activities during decommissioning would be comparable to the construction phase, including the use of heavy equipment on site, preparing staging areas, and restoring disturbed areas around project infrastructure. The project decommissioning activities shall meet environmental, stormwater, erosion control and permitting requirements per local, state, and federal regulations. 2.3 Pre-decommissioning Activities Prior to engaging in decommissioning activities, the Owner will update this decommissioning plan in accordance with appropriate requirements at the time of decommissioning. Decommissioning and restoration activities will be performed in accordance with the latest ordinance in place at the time of decommissioning and in accordance with the Project’s other environmental permits. At the end of the Project's useful life, it will first be de-energized and isolated from all external electrical lines prior to initiating dismantling or ground-disturbing decommissioning work. These activities include coordination and advanced communication with the interconnection utility. 2.4 Decommissioning and Restoration Activities The major components of the Project are PV modules, steel tracker system and support piles, electrical cabling, inverters, and transformers. Except for the project substation, electrical equipment (except when left in place at a depth of 3 feet below grade as noted herein), will be removed from the project property upon decommissioning. Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 3 PV Modules and Tracking System Removal All modules will be disconnected, removed from the trackers, packaged, and transported to a designated location for disposal, recycling, or resale. Module recycling and/or disposal will be performed in accordance with applicable laws and requirements. The connecting cables and the combiner boxes will be de-energized, disconnected, and removed. The steel tracking system supporting the PV modules will be unbolted and disassembled by laborers using standard hand tools, possibly assisted by small portable crane. All steel support structures will be completely removed by mechanical equipment and transported off site for salvage or reuse. Any demolition debris that is not salvageable will be transported to an approved disposal area. Other salvageable equipment and/or material will be removed from the site for resale, scrap value or disposal. The modules and tracking systems are supported via driven steel piles. Any cabling and related equipment (e.g., combiner boxes) are also supported via steel piles. Piles will be removed and salvaged. Electrical Equipment Removal All decommissioning of electrical devices, equipment, and wiring/cabling will be in accordance with local, State and Federal laws. Any electrical decommissioning will include obtaining required permits, and following applicable safety procedures before de-energizing, isolating, and disconnecting electrical devices, equipment, and cabling. The decommissioning contractor (Contractor) is responsible for complying with all applicable site safety and procedures. All electrical equipment will be removed from the project property upon decommissioning. The equipment will be disconnected and transported off site. The following is the sequence for removal: · De-energize inverters, transformers, and other energized equipment and disconnect from the project substation by means of irreversible isolation · De-energize each DC collection circuit by means of irreversible isolation · Disconnect DC and AC collection circuits · Dismantle and remove inverters, transformers, and combiner boxes · Remove and recover aboveground cables. Underground cables will be removed and recovered to 3 feet below grade. The concrete foundations and support pads will be broken up by mechanical equipment (e.g., backhoe-hydraulic hammer/shovel, jackhammer), loaded in to dump trucks and removed from the site. Smaller pre-cast concrete support pads will be removed intact by cranes and loaded onto trucks for reuse or will be broken up and hauled away by dump trucks. Prior to removal of any transformers, any oil will be pumped out into a separate industry approved disposal container and sealed to prevent any spillage during storage and/or transportation. Salvaged oil from transformers will be transported to the nearest oil recycling or disposal center. Equipment and material may be salvaged for resale or scrap value depending on the market conditions. Project Substation In accordance with a request by the Owner, the project collector substation will not be removed at the time of decommissioning because this facility will have value to the landowner relative to future potential uses of the land. Therefore, the project substation is not included in this decommissioning plan. To maintain public safety, Owner will maintain the 6 foot tall fence, barb wire parapet and locking Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 4 gate surrounding the substation. Signs warning of possible hazard due to high voltage equipment will be attached to the substation fence and displayed in accordance with electrical and safety codes applicable at the time of solar project decommissioning. Road Rehabilitation and Removal At the time of decommissioning, the Owner will coordinate with the landowners and easement holders (if applicable) to determine if any internal access roads should remain. If any of these roads serve no future purpose (or as agreed upon by landowner agreement), they will be decommissioned and restored to preconstruction conditions. The decommissioning will involve the removal of the gravel or aggregate and filling the remaining voids with on-site surface materials by grading. Where on-site surface materials are not sufficiently available for filling the remaining voids, suitable earthen fill will be provided from an off-site source. Removed materials will be taken to an appropriate recycling area (possibly on site) where the gravel or aggregate materials can be processed for salvage value or future use. Remaining ground surfaces will be rough graded to merge with the surrounding elevations and returned to near preconstruction conditions by means of grading and discing, using a tractor and disc attachment to restore the soil structure and to aerate the soil. Additionally, if any of the existing roads (previous to project development) are damaged during decommissioning, they shall be repaired back to the same condition they were previous to decommissioning. Site Restoration Following decommissioning, the Project shall be stabilized to prevent adverse environmental effects. The site shall be restored to a clean, safe, and environmentally stable condition to substantially the same physical condition as existed prior to the development of the Project. Site restoration will commence once all above ground and below ground structures and materials have been removed and disposed of appropriately. Also, site restoration will consist of re-seeding of disturbed areas with an appropriate perennial vegetation mixture as required (or as agreed upon with landowner). The site is to be restored to preconstruction conditions or as directed by applicable local, state, federal regulations, or landowner agreement at the time of decommissioning as appropriate. Fences and Gates Except for the project substation fence, the site security fence will be dismantled, removed, and recycled offsite only after all other ground-disturbing decommissioning and site restoration work has been completed. Most line posts are assumed to be direct embedded. Line posts encased in concrete will be removed including concrete. The Project will be accessed through manually operated swing gates located at multiple permanent access points. It is anticipated that the fence, gates, wire, and hardware would be removed and recycled at decommissioning (or as agreed upon with landowner). 2.5 Waste Management Procedures During decommissioning, debris and waste generated will be recycled to the extent feasible and as required by local, state, and federal regulations. The Contractor will facilitate recycling of all construction waste through coordination with licensed contractors, local waste haulers, and/or other facilities that recycle construction/demolition wastes. The Contractor will also be responsible for ensuring that wastes requiring special disposal (e.g., electrical equipment) are handled according to regulations that are in effect at the time of disposal. Although hazardous waste is not anticipated on the site, any hazardous waste would be removed and disposed of in accordance with applicable laws and regulations. Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 5 2.6 Emergency Response and Communications Plans During decommissioning, the Owner and decommissioning Contractor will coordinate with local authorities, the public, and others as required to provide information about the ongoing activities. Besides regular direct/indirect communication, signs will be posted at the Project facility to inform the local public and visitors. The Owner and Contractor’s project representatives contact information (such as telephone number) will be made public for those seeking more information about the decommissioning activities and/or for reporting emergencies and complaints. All inquiries will be directed to the project representative. In the event of an emergency, the Owner will mobilize its resources to the site to respond to the event. Personnel involved in decommissioning will be trained in the emergency response and communications procedures. Emergency response procedures will be prepared prior to decommissioning. 3 Material and Salvage Plan This section identifies major material and equipment quantities on the Project. Any bids from decommissioning contractors will be responsible for verification of quantities (per record drawings), construction costs and salvage rates. The salvageable material quantities were estimated based on the drawing details for the Project and the associated components, weights have been estimated for salvageable material. Salvageable material quantities are derived from the estimated makeup of the materials of the tracking system, piles, inverters, transformers, and power cabling material to be removed and the corresponding steel, aluminum, copper, etc. Copper/Aluminum salvage quantity estimates were derived from cable quantities, lengths, and approximate weights. The following notes and assumptions are applicable regarding salvage recovery rates: · Depending on the component, equipment, and anticipated decommissioning activity, various material recovery percentages ranging from 75% to 100% were assumed. Salvage rate accounts for imperfect removal or intentional partial removal of salvageable material. · The current and future market is not clear on the usability or value of recently deployed solar panels after the approximate component lifecycle of 25 to 30 years. There are multiple options for PV panel end of life: o Solar panels may be recycled by a panel recycler at a cost of approximately $20 per panel according to observed industry trends. This can be further impacted by transportation costs for the recycler or the Owner. As related to this Project, there are currently no local regulations that require this option, but this may likely change in the future and thus is the selected approach. o Solar panel salvage, recycling and reuse is likely to remain dynamic; alternatives should be evaluated for and reassessed periodically. · All excess material that is not salvageable is anticipated to be removed off-site and transported to approved landfill locations. Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 6 3.1 Material Quantities Major materials on the Project are listed in the table below based on conceptual design documents and other design information provided by the Owner. Quantities listed below may not reflect final installed quantities and should be updated to reflect final designs. Detailed material breakdowns are listed in Appendix A. Solar Major Material Quantity Summary* Item Description/Details Unit Estimated Quantity Notes PV Modules/Panels Vsun model 550- 144BMH-DG Each 22,000 Inverters/MV Step Up Transformers Sungrow SG3600UD-MV Each 3 Tracker Assembly System Sunfolding Single Axis Tracker Each 440 ~2000 lbs each Steel Piles Various ‘W’ Shape Each 4,827 Majority W6x9 LV Cable/Wiring Various Sizes LF 266 MV Cable/Wiring Various Sizes LF 2,600 Interior Roads 20 ft width LF 7,500 Gravel roads 12 in depth Fencing Assume 7 ft Tall and Buried Posts LF 7,886 Excludes Substation *Current project design is still in design development, most quantities in table are assumed for estimating purposes. See Appendix A for additional breakdown of materials. 4 Decommissioning Cost Estimates It is anticipated that there will be costs associated with the decommissioning of the Project. These current estimates of costs for the Project presented in this plan are based on design quantities and are to be updated as the project design is finalized. Table 1 shows the summary of the estimated decommissioning costs for the Project including the salvage value. Decommissioning Cost The estimated decommissioning costs are associated with construction costs of a contractor decommissioning the site. This includes but is not limited to activities listed in Section 2. Decommissioning costs consisting of labor, equipment, and materials are based on labor activities from RSMeans1, a construction cost estimating database. Labor activities most closely associated with each step in the decommissioning process were selected to build up the decommissioning cost estimate. Because the PV modules are planned to be recycled at end of life a recycling cost is included the cost estimate. Further breakdown of these costs can be found in Appendix A. 1 RSMeans Data Online from Gordian®. www.rsmeans.com/online. Accessed May 2023 Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 7 Table 1. Summary of Estimated Decommissioning Costs Net Decommissioning Activity/Cost Amount (USD) Cost Basis Amount ($/kWac) Decommissioning Costs $821,000 $82.1 Solar Array $821,000 $82.1 Net Salvage Cost or (Value) ($18,000) ($1.8) Solar Array (less PV modules) ($458,000) ($45.8) PV Module Recycle Fee $440,000 $44.0 Estimated Net Decommissioning Cost $803,000 $80.3 The following assumptions apply to the tabulation of quantities and costs associated with this decommissioning, see Appendix A for additional assumptions and basis for estimate. · Decommissioning costs are in 2023 dollars. · The labor costs are based on average labor costs for Glenwood Springs, CO. · All material quantities are tabulated via available preliminary design information and may not reflect final installed quantities. · Cost estimates are for budgetary purposes only and do not represent guaranteed costs. The estimates are anticipated to be subject to adjustment at the time decommissioning is initiated. · Total cost includes salvage credits and any recycling or disposal fees as noted. · PV panels and other major equipment may have resale value on a secondary market depending on the market and the condition of the equipment. This value depends on such market at the time of decommissioning. · No biological, environmental monitoring or testing is included or anticipated per current requirements. · This cost estimate does not include contingency. Decommissioning Plan FINAL Wheeler Gulch Solar Farm June 2023 | 8 APPENDIX A: DECOMISSIONING COST BREAKDOWN Decommissioning Plan Wheeler Gulch Solar Farm June 2023 | 9 Decommissioning Cost Solar Array Decommissioning Cost Decommissioning Estimated Quantity Unit Estimated Unit Cost ($/Unit)Total Cost ($)Remarks / Assumptions Mobilization / Demobilization / Management 1 project $35,370.00 $35,000 Single mobilization and establishment of necessary services, labor & material. Percent of decommissioning total. PV Module removal 22,000 module $6.10 $134,000 Dismantle, palletize and load on flatbed truck for disposal or sale; assume 25% of reported module installation cost Racking/Tracking Assembly Removal 451 ton $298.67 $135,000 Dismantle, load on flatbed truck for disposal or sale; assume removed to average 30 lb sizes Tracker Motor/Drive Removal 440 each $35.36 $16,000 Disconnect, electrical demolition, remove, incl accessories Steel Pile Removal 71,997 LF $3.22 $232,000 Remove all and load on flatbed, assume 33% of the RSMeans unit cost due to smaller crew size and smaller pile size/length Above ground Cable Removal 154,400 LF $0.34 $52,000 Disconnect, remove all above ground DC cabling (total DC cable quantity less DC trenching length) Underground Cable Removal and Excavating 39 BCY $7.97 $0 Excavate, remove all cable, and backfill; assume only 5% of UG cable is recovered due small amount above the 3ft below grade threshold Central Inverter Removal 3 each $2,776.35 $8,000 Disconnect, electrical demolition, remove, load on truck for disposal Combiner Box Removal 88 each $209.58 $18,000 Disconnect, electrical demolition, remove, load on truck for disposal (50% of installation cost) Step-up Transformer Removal 0 each $1,017.86 $0 Assume equal to the cost of labor and equipment to install. Road and Aggregate Removal 5,556 CY $8.55 $48,000 Excavation, 50' haul to dump truck, gravel removed to local storage at 4 mile haul Fence Removal 7,888 LF $3.48 $27,000 8' height; 1' Barbed Parapet (3-Wire), 10' post spacing, includes gate and direct embeded posts Corner Fence Post Removal 616 each $19.36 $12,000 Selective demolition, chain link fences & gates, fence, posts, steel in concrete Rough Grade Site (as required by disturbance)13 acre $2,434.59 $30,000 Return to smooth contours where needed; not all acres will need to be graded. Converted unit cost from $ per 100,000 sq. ft to $ per acre Site restoration / Seeding 25 acre $1,571.45 $39,000 Assume seeding only disturbed areas as percentage of developed site; Native seed mix/species and no fertilizer. O&M Building, demolish 0 CF $0.37 $0 Dismantling and haul of small building, assume wood construction. O&M Building, foundation removal 0 SF $0.99 $0 Assume 6" concrete foundation Salvaged Material Hauling 2,134 CY $16.20 $35,000 Assume 20 mile haul for all steel, recovered cable, fencing, and electical equipment are hauled to material handling location for purchase Total Decommissioning $821,000 Decommissioning Plan Wheeler Gulch Solar Farm June 2023 | 10 Salvage Value Solar Array Salvage Value Salvage Value Potential Salvage Quantity Unit Estimated Unit Value/(Cost) ($/Unit) Total Salvage Value ($)Remarks PV Module Recycling / Disposal 1,649,120 lbs ($0.27) ($440,000)Cost based on panel recycling cost, not included in mobilization cost Central Inverters 119,050 lbs $0.26 $31,000 Assume scrap value in line with electronic scrap (includes MV Transformer) Combiner Boxes 8,800 lbs $0.26 $2,300 Assume scrap value in line with electronic scrap MV Step-Up Transformers - Oil Recovery 0 gallon $1.80 $0 Assumption; oil age and contamination will determine recyclability, 75% recovery assumed Fence and Fence Posts 12 ton $376.59 $4,500 Assume steel scrap value Steel Tracker & Inverter support piles 497 ton $376.59 $187,200 Assume steel scrap value; Pile weights and lengths vary - tonnage estimated on full removal Tracker Motors 22,000 lbs $0.23 $3,700 Assume electric motors scrap value but reduced percent due to rubber bladders Racking Assembly 0 ton $376.59 $0 Assume steel scrap value Tracker Assembly 440 ton $376.59 $165,700 Assume steel scrap value DC Grounding 2,094 lbs $2.69 $5,400 Assume copper scrap value; Salvage rate reflects shallower depth. LV Wire and Cabling, copper 7,500 lbs $2.69 $18,200 Copper DC feeder Cable LV Wire and Cabling, aluminum 4,334 lbs $0.57 $2,200 Aluminum DC feeder Cable MV Wire and Cabling, copper 0 lbs $2.69 $0 Copper AC feeder Cable. Assumed 5% Salvage rate due to depth. MV Wire and Cabling, aluminum 3,224 lbs $0.57 $100 Aluminum AC feeder Cable. Assumed 5% Salvage rate due to depth. Tracker LV Power Wire and Cabling 571 lbs $2.69 $1,500 Assume copper scrap value Assorted PVC Conduit 0 lbs $0.49 $0 Assume average PVC CRV scrap price Aggregate Recovery 5,556 CY $8.28 $34,500 Aggregate, crushed bank gravel, per C.Y., includes material only (assume partial value; 50% of new gravel) Fiber Optic Cable Recovery 65 lbs $0.00 $0 Includes PV array and Tracker communications cabling Control/Communications Equipment 6,000 lbs $0.26 $1,600 Assume scrap value in line with electronic scrap MET Stations 300 lbs $0.26 $100 Assume scrap value in line with electronic scrap Total Salvage (less PV Module)$458,000 Total PV Module Fee ($440,000)