| Emissions mitigation | Form: (02A )
401658502
12/20/2018 | Green Completions -Test separators and associated flow lines, sand traps and emission control systems shall be installed on-site to accommodate green completions techniques. When commercial quantities of salable quality gas are achieved at each well, the gas shall be immediately directed to a sales line or shut in and conserved. If a sales line is unavailable or other conditions prevent placing the gas into a sales line, the operator shall not produce the wells without an approved variance per Rule 805.b.(3)C. |
| Planning | Form: (04 )
402872189
1/7/2022 | Lighting Mitigation: - During construction, no night work and no permanent lighting will be installed on the Site. Daylight operations only are performed during this phase of operation. – The Operator’s development of the Yellow location necessitates work activities to be performed 24 hours a day during drilling and completion phases, requiring the use of temporary and transient lighting to conform with nationally recognized industry and federally mandated safety standards. - A proposed 32-foot-high sound/visual wall (32-foot wall) will be installed on the North, South and East side of the site. - There will be 3-Fixture LED Telescoping Mobile Temporary Lighting Towers and 2- Fixture LED Flood Wall Mounted Lights that may be affixed to the 32-foot wall and lights permanently affixed to equipment. All lighting capable of adjustment will be directed inward, downward and shielded to avoid glare on public roads and to prevent light shining beyond the boundary of the Site, while at the same time providing a safe workplace that is free from recognizable hazards and complies with OSHA, ANSI and IESNA standards. - Drilling rig lights shall be angled and shielded to avoid direct light shining beyond the boundary of the site. - The lights will be inward, pointing away from residents and none of the lights are directed outward. - Concurrent to the commencement of any operational changes (e.g., at the end of drilling operations and at the start of hydraulic stimulation operations), a lighting self-audit of the site will be performed to ensure that there is not any rogue light coming from the site that may become a nuisance. - Once wells are in the production phase, no night work is anticipated, and no permanent lighting will be installed on the site. - Will use automation, timers, or motion sensors to control and minimize lighting when not needed. - Will use full cut-off lighting to better direct light, lighting colors that reduce lighting intensity and low-glare or no-glare lighting when possible. |
| Storm Water/Erosion Control | Form: (04 )
402872189
1/7/2022 | During the drilling phase, the perimeter swales will capture runoff from the exposed cut slopes and any
runoff from the graded pad. The swales are designed to provide 1 foot of freeboard above the 100-year
storm peak flow rate. The swales direct any runoff from the proposed site to the sediment basin,
located along the southern edge of the pad, where the water will be detained and treated for water
quality before outletting into the historic drainage path. The sediment basin provides 3 feet of detained
volume (approx. 40,830 cubic feet) before being discharged at the historic runoff flow rate. In summary,
any runoff from the pad will be captured and detained within the sediment basin for treatment and
removal of any sediment before being discharged into the historic drainage path to protect the Box
Elder drainage.
While site is under construction, an inspection is required at least every 14 calendar days;
Post storm event inspections must be conducted within 24 hours after the end of any precipitation or snowmelt event that causes surface erosion.
Inspection records will be kept on file for a minimum of three (3) years from expiration or inactivation of permit coverage. These records will be made available to the regulatory agencies upon request.
After interim reclamation, the pad size will be reduced and the perimeter swales will be reconstructed
around the reduced pad edges. The swale sizing will continue to maintain a minimum of 1-foot of
freeboard above the 100-year storm peak flow rate and collect any runoff from the cut slopes and pad
surface. The sediment basin will be converted to an extended detention basin that is outfitted with a
water quality orifice plate and historic flow rate restrictor plate on the outlet pipe. |
| Material Handling and Spill Prevention | Form: (04 )
402872189
1/7/2022 | Material Handling and Spill Prevention: To ensure protection for the surface during construction, drilling and completions, the location will be specifically constructed to contain any releases or spills. Secondary containment from any chemical spills or leaks will surround any trucks that carry, mix, or add chemicals to the flow stream as well as connections that could possibly leak fluid. Should any spill or release occur, every reasonable step will be taken to quickly remediate the area disturbed. One to seven inspections per week will be recorded and kept in the district office and available to regulatory agencies. Records will be kept electronically indefinitely.
Berm Construction: A steel containment berm or structure will be erected around the oil and water storage tanks. The berm will enclose an area sufficient to contain and provide secondary containment for 150% of the largest single tank. The berm will be inspected at least every 14 calendar days while the site is under construction and within 24 hours of a precipitation event. Inspection records will be kept on file for a minimum of three (3) years from expiration or inactivation of permit coverage. These records will be made available to the regulatory agencies upon request. |
| Dust control | Form: (04 )
402872189
1/7/2022 | Application of fresh water to disturbed areas during earth moving activities.
- Application of fresh water or magnesium chloride to graveled surfaces of the Site and associated roads.
- Use of high-quality construction materials such as crushed granite road base, which generates less dust than other aggregates.
- Limit disturbance of natural vegetation to only that area that is reasonably necessary for construction. - Re-establishment of vegetation on disturbed areas not graveled.
- Covered storage containers to be used for sand, silica, proppant or similar material during hydraulic fracturing.
- Establish speed limit on all access roads of 20MPH or less. Personnel failing to comply will be subject to disciplinary action.
- Establish speed limit on the Site of 5MPH or less. Personnel failing to comply will be subject to disciplinary action.
- Curtail scope of work during high wind conditions (sustained winds 25MPH or greater).
- Regular road maintenance will include adding gravel and grading when needed per the executed Road Maintenance Agreement between the Operator and City of Aurora.
- Additional management practices such as road surfacing, natural wind breaks and barriers, or automation of wells to reduce truck traffic may also be utilized to minimize fugitive dust emissions.
- Crestone will use a rock base tracking pad at the access point to help remove dirt and prevent debris from collecting on all access roads. As necessary, Crestone will sweep roads nearest the access point of dirt and debris to maintain a clean entrance.
- Vertically track the stockpile by heavy equipment to prevent wind and water erosion.
- During construction, salvaged topsoil will be seeded and monitored for erosion and the establishment of undesirable and noxious weeds routinely.
- Seeding and straw mulch application will occur on the long-term topsoil storage stockpile during interim reclamation.
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| Noise mitigation | Form: (04 )
402872189
1/7/2022 | A proposed 32-foot-high sound/visual wall (32-foot wall) will be installed on the South and East side of the site.
- Acoustical panels will be added to equipment during fracing operations in order to remain in compliance with COGCC limits.
- During production phase, acoustical walls will be placed around production equipment. |
| Odor mitigation | Form: (04 )
402872189
1/7/2022 | Drilling rig engine exhausts are pointed straight up so as not to be directed towards any occupied buildings.
- To mitigate the effects of odor from Crestone's operations, Crestone will employ only International Association of Oil & Gas Producers (IOGP) Group III drilling base fluids with <0.5 weight % aromatics and will not use drilling fluids based on diesel. These Group III drilling fluids are odorless and contain no BTEX.
- Drilling mud chillers are used to keep drilling fluid temperatures low. (Low drilling fluid temperatures reduce the volume of fluid vaporized into the air.)
- All drilling fluids will be routed through a closed loop system.
- No open earthen pits to store fluids or drill cuttings. - Drill piping is wiped down each time the drilling operation trips out of the hole.
- Drill cuttings are placed in metal bins and covered to minimize odors prior to being transported to the designated waste management facilities.
- During the hydraulic fracturing process, diesel-fueled equipment is placed in a way that exhausts are pointed straight up to not direct exhaust towards any occupied buildings.
- Tier II or Tier IV diesel engines are used during hydraulic fracturing operations where available. - During operations, tanks are sealed with a thief hatch to prevent emissions.
- Emission Control Devices (Combustors) will be used to combust any flash gas from tanks.
- During oil loadout operations, a Truck Loadout Vapor Recovery (TLVR) system will be used to capture and direct odorous air contaminants and emissions to a combustor
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