| Storm Water/Erosion Control | Form: (02A )
402634194
8/5/2022 | Measures for stormwater, erosion, and sediment control will be accomplished through a combination of construction techniques, structural and non-structural controls, vegetation, and re-vegetation, administrative controls, and good housekeeping practices. Control measures will be implemented and adjusted with changing site conditions, as well as phases of construction. All control measures deployed throughout construction, shall be identified on site specific stormwater management plan as-built maps. Control measure installation and maintenance procedures will defer to Urban Drainage and Flood Control District specifications, or as identified in Section 6.0 and the grading plans (Appendix B). |
| Storm Water/Erosion Control | Form: (02A )
402634194
8/5/2022 | BMPs for Construction
• Limits of Construction (LOC) will be delineated and marked with lathe and flagging prior to start of
construction.
• Access Road Construction will follow location delineation and serve as the primary route for
construction and operational purposes.
• Vehicle Tracking Controls (VTC) will be installed at the ingress/egress of the location access and be
the primary sediment control measure for equipment and vehicle traffic.
• Diversion Ditch (DD) will be installed around the location perimeter prior to commencement of
surface disturbing activities, and act as the primary stormwater control measure.
• Sediment control Log (SCL) will be used for inlet protection, as check dams to reduce flow velocity,
and on disturbed slopes to shorten flow lengths.
• Sediment Basin (SB) will be installed to capture eroded or disturbed soil transport, prior to discharge
from the location and the diversion ditch network.
• Culverts are used for diversion ditch crossing(s), or along access roads. Culverts will be 18” minimum,
or appropriately sized to accommodate design flows.
• Inlet Protection (IP) consists of a sediment control measure such as rock sock, sediment control log,
or proprietary inlet insert. Inlet protection will be maintained and based on manufacturer
recommendations.
• Outlet Protection (OP) includes both sediment control measures and riprap armoring at culvert
outlets. It will be specified based on culvert capacity and corrective action prescriptions during
construction operations.
• Fencing will be installed following completion of construction. Fencing will prevent wildlife from
entering equipment and secondary containment and remain in place until final reclamation is
achieved.
• Seed and Mulch (SM) will be used to stabilize all stockpiles, disturbed areas, and areas no longer in
use for production operations, or during interim reclamation. |
| Storm Water/Erosion Control | Form: (02A )
402634194
8/5/2022 | BMPs for Inspection
• During construction, inspections shall be conducted every 14 days, and after a major precipitation
or melt event, which has the potential to cause surface runoff.
• For sites earthwork and construction is completed, but final stabilization is not achieved due to
vegetative cover, inspections shall be conducted every 30 days and exclude precipitation or melt
event response. Inspections will continue until all reclaimed areas have achieved a cover of 70% the
pre-construction reference vegetation (i.e. final stabilization).
• Post-construction stormwater inspections will be conducted in accordance with COGCC Rules
1002.f and 1003.e, to document the status of the location, maintenance needs, effectiveness of
stormwater control measures, to evaluate pollution sources, and to document reclamation / final
stabilization progress. Inspections will be managed by the Stormwater Manager and conducted by
their designated representative(s).
• Findings, inspection records and site maps are documented electronically and available within 24
hours of any inspection. All inspection records are stored for a minimum of three years after the
location has achieved final stabilization. |
| Storm Water/Erosion Control | Form: (02A )
402634194
8/5/2022 | BMPs for Maintenance
For maintenance items discovered at active construction locations:
• Action and documentation towards completing repairs identified at the time of inspection shall
be made within 24 hours of discovery.
• For maintenance items during post-construction, items will be documented and coordinated with
production crews.
• Timeline for completion of maintenance items are a priority and will depend on scope; but in all
cases, shall not be completed until field conditions allow for safe access, and utility clearance has
been confirmed for actions requiring ground disturbance / earthwork. |
| Material Handling and Spill Prevention | Form: (02A )
402634194
8/5/2022 | Drilling and Completions
Frequent and thorough inspections throughout all stages of operations.
• Procedures and training on equipment use in place to avoid and mitigate spills.
• Double-walled storage tanks will used where applicable.
• Continuous monitoring and third-party systems will be used to track fluid volumes and monitor for leaks.
• Rig will be placed on an impervious plastic liner including four-inch to six-inch high berm walls.
• Closed loop drilling systems will be utilized.
• Temporary portable containers (e.g., drums) are stored inside plastic lined or other impervious containment.
• General secondary containment (impervious liner) will be placed under equipment.
• Active drilling fluid tanks will be equipped with a third-party measurement and alarm system (Pason Pit Volume Totalizer) to track tank volumes and changes during the drilling operation.
• Fluid storage tanks on the location will be equipped with mechanical (visual) level indicators that are inspected by operation personnel.
• Third-party continuous monitoring on integral systems in addition to routine inspections. In the event of an upset condition, Operators are
notified and respond immediately.
• Regular preventative maintenance schedules followed for equipment. |
| Material Handling and Spill Prevention | Form: (02A )
402634194
8/5/2022 | Facility Construction
• Qualified third-party inspectors will inspect equipment to evaluate compliance with COGCC Rules and Regulations and applicable technical
standards.
• Secondary containment will be installed with an impervious liner.
• Secondary containment will be sized to 150% of the largest storage tank.
• Production tanks will be lined where applicable.
• Pressure and Integrity testing prior to placing equipment into service.
• All equipment will be installed and tested in accordance with applicable American Society of Mechanical Engineers (ASME) and American
Petroleum Institute (API) standards.
• Underground piping on the facility will be electronically inspected prior to installation using coating deficiency detectors per COGCC 1102.I.(1).
• Flowlines will be inspected by a qualified third-party inspector who is trained in accordance with 1102.h prior to placing into service.
• Flowlines will be integrity tested per 1100 Series Rules.
• All production tanks are built in accordance with API 12F standards.
• Produced water production tanks at the facility utilize an internal liner.
• Test ports for integrity testing are installed on insulated tanks. |
| Material Handling and Spill Prevention | Form: (02A )
402634194
8/5/2022 | Spill Prevention and Material Handling
• Inspections of all production equipment including temporary equipment.
o Routine operational checks on the facility.
o Documented weekly inspections.
o Audio, Visual, Olfactory (AVO) inspections in accordance with COGCC Rule 609.d. and Air Quality Control Commission Regulation 7
o Annual Spill Prevention and Control Countermeasure Inspections.
• Periodic operator training on spill prevention best management practices and equipment operations.
• Fluid handling equipment will have valves and caps to mitigate leaks.
• Internal and External Tank integrity Inspections.
• Annual separator and flow through process equipment cleanouts and integrity evaluations.
• Pressure testing of all flowlines.
Spill Response
• Response to all spills and release in accordance with COGCC 900 Series Rules including timely reporting, response, and investigation. |
| Dust control | Form: (02A )
402634194
8/5/2022 | • 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. |
| Construction | Form: (02A )
402634194
8/5/2022 | Topsoil Removal: Depth of each soil horizon will vary with individual soil units, and determination of depth and proper removal will be monitored during construction by physical characteristics of color, density, and texture change of soil, and as determined during Site Investigation. Topsoil may not be removed during wet soil moisture conditions, as field determined considering soil texture.
Subsoil Horizon Separation: Lower soil horizons will be stockpiled separately from topsoil where it can be used for contouring during reclamation and preserved in order of original state. Distinctly visible soil horizons or soil types shall be stockpiled separately (i.e. gravel or
shale layers). Under no circumstances shall subsoil be mixed with topsoil, nor placed on top of the removed topsoil stockpile.
Topsoil Protection: If topsoil will be stockpiled for extended periods of time, it shall be protected from degradation due to erosion, compaction and contamination and to maintain soil microbial activity, using best management practices (BMPs) such as stabilizing with mulch, seeding, track walking, perimeter control or a combination of BMPs. Weeds on stockpiles shall be controlled as to prevent production of weed seed and/or enough biomass that would interfere with redistribution of soil or cause onsite debris. Signage shall be installed to identify topsoil stockpiles to facilitate subsequent reclamation and indicate to personnel that the area may not be disturbed during drilling and completion operations.
Topsoil Storage Requirements
A. Calculations: Stored topsoil volumes necessary to facilitate subsequent or final reclamation shall be calculated based off areas remaining for production operations and integrated as Crestone Peak Resources Site Specific Stormwater Management Plan for Construction Activities
Sky Ranch 4-65 10-9 & Prosper Farms 4-65 11-12 part of the interim reclamation area per Rule 1003. Topsoil salvage quantities are included
in the grading plans (Appendix B).
B. Interim Reclamation: Placement and distribution will be determined by disturbance area boundaries, surface owner input, land use, and topography.
C. Topsoil Protection: Stored topsoil shall be protected from erosion and to maintain soil microbial activity, using a combination of best management practices, such as proper design of stockpile depth and contour, stabilizing with mulch, seeding, track walking, perimeter control, establishment of vegetation and weed control.
D. Signage and Identification: Stored topsoil locations will be documented per Rule 1002.b. Signage identifying topsoil shall be installed, where feasible, and based on land use. |
| Noise mitigation | Form: (02A )
402634194
8/5/2022 | Site selection
• This site was selected to maximize distance to the nearest RBUs
2. Equipment selection
• Quiet-Fleet™ hydraulic fracturing technology will be utilized to decrease noise
3. Equipment placement
• Drilling – Ensign 140, V-door of the drilling rig facing north per site plan.
• Completions – Liberty Quiet fleet with the pump trucks west of the wells
4. Temporal factors:
• Shipments of tubular deliveries and unloading will be limited to daylight hours
Figure 10- Noise Monitoring Equipment
10
• Truck traffic will be limited to day times hours, whenever possible |
| Noise mitigation | Form: (02A )
402634194
8/5/2022 | Minimization:
1. 32-foot high STC-43 portable acoustical panels will be installed on 700 lineal feet of the well pad on
the south side of the Well Site (Figure 11)
2. 24-foot high panels installed in multiple locations on the pad to reduce or redirect as much of the noise
away from the RBUs
3. Sound panels, or SK8, will be used on this site to isolate noise from individual pieces of equipment as
needed
4. Drilling rig engine exhausts are pointed straight up so as not to be directed towards any
occupied buildings
5. Crestone will install “quash” sound damping material in all permanent buildings that house noise
sources
6. Crestone will conduct an ambient sound level survey, noise modeling analysis, and provided continuous
sound level monitoring in support of Rule 423 |
| Emissions mitigation | Form: (02A )
402634194
8/5/2022 | Operator will eliminate use of VOC paints and solvents |
| Emissions mitigation | Form: (02A )
402634194
8/5/2022 | Operator will follow the additional ozone mitigation measures, as feasible, on forecasted Ozone Action Days:
Minimize vehicle and engine idling
Reduce truck traffic and worker traffic
Postpone the refueling of vehicles
Postpone construction activities
Reschedule non-essential operational activities such as pigging, well unloading and tank cleaning
Postpone flowback if emissions cannot be adequately captured with a vapor recovery unit |
| Emissions mitigation | Form: (02A )
402634194
8/5/2022 | Operator will have a pipeline in place for oil takeaway within one year from the start of production. |
| Odor mitigation | Form: (02A )
402634194
8/5/2022 | 1. Drilling rig engine exhausts are pointed straight up so as not to be directed towards any occupied buildings.
2. 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.
3. Drilling mud chillers are used to keep drilling fluid temperatures low.
a. Low drilling fluid temperatures reduce the volume of fluid vaporized into the air.
4. All drilling fluids will be routed through a closed loop system.
5. No open earthen pits to store fluids or drill cuttings.
6. Drill piping is wiped down each time the drilling operation “trips” out of the hole.
7. Drill cuttings will be stored in metal bins; once full, the bins will be covered and the contents of the bins will be mixed with dry dirt in the bin and then loaded into trucks and transported from location to the designated waste management facilities. |
| Drilling/Completion Operations | Form: (02A )
402634194
8/5/2022 | • 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.
• Crestone’s development of the Sky Ranch Form 2A (the “Site”) 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 south 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 avid 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.
• As the photometric plan depicts, lighting does not go beyond the borders of the oil and gas operating area. |
| Interim Reclamation | Form: (02A )
402634194
8/5/2022 | Recontouring and Compaction Relief: The first material to backfill will be from excavated subsoil materials, and compacted to avoid subsidence, but not restrictive to root growth of plants. The stockpiled soil horizons will be replaced in order and graded with the adjacent
undisturbed land. Ripping/subsoiling will be required prior to topsoil redistribution if soil is very compacted from vehicle or equipment traffic.
Topsoil Redistribution: The stockpiled topsoil will be redistributed uniformly and to minimize compaction of soil. Topsoil may not be redistributed during wet soil moisture conditions. Topsoil should be leveled with the adjacent undisturbed land, irrigable land
being of importance for uniform coverage by flood irrigation water. |
| Interim Reclamation | Form: (02A )
402634194
8/5/2022 | The following BMPs will be utilized:
Landscape Description
• The surface water flow direction is to the south and southwest.
• The nearest intermittent streambed is First Creek and is located approximately 800 feet to the south. First Creek is a tributary to the South Platte river.
Erosion Control Measure Deployment
• Drill seed and mulching application will be completed within 24 hours of seedbed preparation, weather permitting.
• Seed mix will be cross drill seeded throughout the interim reclamation area.
• All seed will be certified weed free and pure live seed (PLS) rated per federal, state, county, and municipal standards.
• Certified weed free grass or wheat origin straw mulch will be uniformly applied at rate of 1,000 lbs./ per acre to cover 100% of the seed bed.
• Mulch will be properly anchored to the soil surface using a commercial straw crimper with a final orientation NE to SW on slopes less than 8% and on contour on greater slopes.
• Hydraulically applied tackifier/Ecomatrix BFM will be applied at a rate of 1,000 lbs./ per acre to sufficiently secure straw mulch through the first growing season on slopes greater than 8%, stabilize soils and increase moisture retention, promote seed germination and establishment, and assist in erosion prevention.
Soil Management and Placement
• Topsoil horizon depth will be identified based on changes in physical characteristics.
• Topsoil will be separated from the disturbance area to the depth of the topsoil horizon.
• Salvaged topsoil will be stockpiled, seeded with cover crop grasses, and the location marked or documented.
• Topsoil will not be comingled with subsoil materials during recontouring and subsoil preparation operations.
Grading
• The grading of the interim reclamation area is between 0-2 percent.
Seeding Method
• The seeding method for interim reclamation will be drill seeding.
Weed Management
• Certified weed free grass or wheat origin straw will be utilized for mulching operations.
• Mowing operations will be commenced when the height of weeds exceeds 6 inches or before seed development.
• Herbicide applications will be utilized as needed to treat prostrate, low growing, or perennial noxious weed species for which mowing methods are ineffective.
• Herbicide applications will be spot-specific and only broadleaf herbicides will be deployed.
Pre-Disturbance Landscape Assessment
• A landscape assessment will be conducted prior to ground disturbance to ensure that the recontoured reclamation surface matches pre-disturbance grade and topography.
• Any preexisting drainage features will be reestablished during recontouring.
Site-Specific Seed Mix
• Reseeding will be completed with species consistent with the adjacent plant community.
• The selected seed mix and rate for this location is the Loamy Plains Seed Mix (see Seed Mix Table above).
• Crestone will consult with the surface owner regarding the planned seed mix.
• Seeding will occur throughout the interim reclamation area, the screening berms, and at least 5 feet into the adjacent landscape using broadcast equipment.
Fence Installation
• A 4’ wildlife fence will be installed to mitigate wildlife access to the working surface and prevent vehicle traffic from entering the interim reclamation area. |