HomeMy WebLinkAbout1.13 Grading and Drainage Plan Narrative
Administrative Review CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
TPR 176-25
Underground Injection Control
Well
Grading and Drainage Plan Narrative
CPX TPR 176-25 UIC Well
Article 4 Section 203.E
Grading and Drainage Plan Narrative
Administrative Review 1 CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
1. Introduction
The following narrative addresses the requirements for the Grading and Drainage Plan
under Article 4 Section 203.E. of the Garfield County Land Use and Development Code
(LUDC).
2. Section 4-203.E.1. Site Map.
A Site Map showing locations of any existing structures, Waterbodies or hydrologic
features on the site, including intermittent water features, Wetlands, and the 100-year
Floodplain boundaries.
The 176-25 UIC Well Site Plan, depicting the site features, are provided in the Site Plan
tab. TPR Well Pad 25A is an existing, previously constructed, and established well pad.
There are no streams, floodplain areas, intermittent water features, wetlands, or other
hydrological features located within the perimeter of Well Pad 25A. There are no 100-
year Floodplain boundaries located within the vicinity of the site. The Surface Hydrology
Map and a narrative exhibit describing the hydrology surrounding Well Pad 25A is
located in the Grading and Drainage Plan tab.
3. Section 4-203.E.2. Drainage Structures.
Section 4-203.E.2.a. Locations of existing and proposed drainage structures or natural
drainage features affecting site drainage on the parcel and within 10 feet adjacent to the
site boundary, including street gutters, storm sewers, drainage channels, and other
water conveyance structures; and Wetlands or other Waterbodies receiving storm
Runoff from the site.
Section 4-203.E.2.b. Preliminary engineering design and construction features for
drainage structures to be constructed.
Well Pad 25A was constructed in 2008 and the TPR 176-25 well was drilled in 2013.
Well Pad 25A has no uncontrolled stormwater on the well pad. The well pad has a 6-
inch-diameter drain at the center of the well pad. The drain is piped outside of the berm
to a trench. The trench drains to a catchment basin. Solids settle in the catchment basin
for removal. The stormwater evaporates.
A construction layout showing the Well Pad 25A stormwater controls is located in the
Grading and Drainage Plan tab.
4. Section 4-203.E.3. Topography.
Existing topography at reasonable contour intervals to provide necessary detail of the
site. The map should extend a minimum of 10 feet beyond the property line and show
the location of the property line.
The proposed injection well will be located on Well Pad 25A, an existing, established
location. The nearest adjacent parcel is owned by CPX, the Applicant. The nearest
CPX TPR 176-25 UIC Well
Article 4 Section 203.E
Grading and Drainage Plan Narrative
Administrative Review 2 CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
parcel boundary owned by a different surface owner (the White River National Forest) is
located approximately 2,200 feet to the north.
The Stormwater Figure located in the Grading and Drainage Plan tab, the 176-25 UIC
Well Site Plan located in the Site Plan tab, and the Hydrology Map located in the
Grading and Drainage Plan tab all show reasonable contour intervals at the site.
5. Section 4-203.E.4. Grading Plan.
A grading plan showing the proposed topography at reasonable contour intervals that
provides necessary detail of the site. The plan shall show elevations, dimensions,
location, extent, and Slope of all proposed clearing, and Grading including building site
and driveway grades.
There are no proposed grading, construction, or site clearing activities associated with
the development of the proposed injection well.
Below is a description of the current acreage disturbance of the existing Well Pad 25A
and the estimated footprint following interim reclamation required by COGCC.
Surface Use Disturbance – Well Pad 25A
Approximate Acres of
Disturbance
Existing Disturbance - Well Pad 25A (including
Cuts/fills)
5.5
Disturbance After Interim Reclamation (Long-term
Disturbance)
1.8
The Stormwater Figure located in the Grading and Drainage Plan tab and the 176-25
UIC Well Site Plan located in the Site Plan tab show the as-built details for the site.
6. Section 4-203.E.5. Soil Stockpile and Snow Storage Areas.
Probable locations of soil stockpiles and snow storage areas.
An existing soil stockpile is located at the edge of Well Pad 25A. It contains an
estimated 8,450 cubic yards of soil salvaged during construction of Well Pad 25A. The
soil stockpile is protected from wind and water erosion by a stable 2:1 slope and
vegetation. The proposed UIC well will not result in additional soil disturbance.
Snow within the site perimeter will be stockpiled only as needed to allow operations and
will be placed near the outer boundary of the pad.
7. Section 4-203.E.6. Drainage Plan.
CPX TPR 176-25 UIC Well
Article 4 Section 203.E
Grading and Drainage Plan Narrative
Administrative Review 3 CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
Proposed drainage plan.
TPR Well Pad 25A is an existing, previously constructed, and established well pad. No
well pad construction activities will be associated with the development of the proposed
injection well.
CPX will utilize engineering and operational BMPs to limited runoff. The Well Pad 25A
drainage features and stormwater controls are detailed in the Stormwater Figure located
in the Grading and Drainage tab.
8. Section 4-203.E.7. Equipment Storage Areas.
Location of storage areas designated for equipment, fuel, lubricants, chemical, and
waste storage with an explanation of spill containment structures.
The TPR 176-25 UIC well TPR Well Pad 25A will have approximately 4,750 barrels of
on-pad storage for produced water, part of which will be used to store produced water
for injection in the proposed UIC well.1 Produced water tanks will be installed in lined
secondary containment providing capacity of 150% of the volume of the largest tank.
9. Section 4-203.E.8 Temporary Roads.
Location of temporary roads designed for use during the construction period.
No temporary road are required to develop the proposed injection well. A site-specific
access road was constructed during the initial development of Well Pad 25A in 2008.
This access road will be utilized during the life of the UIC well and associated well pad.
10. Section 4-203.E.9. Areas of Steep Slope.
Areas with Slope of 20% or greater shall be identified by location and percentage of
Slope, both for the existing site conditions and within the developed area.
The proposed injection well involves the conversion of an existing drilled but
uncompleted well into an injection well. The injection well will be located on an existing,
established well pad that is fully constructed and graded. There are no slopes that
exceed 20% within the developed well pad.
1 Not all of the produced water storage on TPR Well Pad 25A will be devoted to supporting the
proposed injection well. At the maximum anticipated injection rate, CPX anticipates that
approximately 3,000 barrels of storage will be needed to support the injection well operations.
In addition to the produced water storage, Pad 25A will also contain one 750 bbl condensate
tank and a 300 bbl blowdown tank that will be used to control wellbore emissions from the
natural gas wells on Pad 25A in the event a well on Pad 25A needs to be unloaded. The
condensate tank and blowdown tank will not support the proposed UIC well.
CPX TPR 176-25 UIC Well
Article 4 Section 203.E
Grading and Drainage Plan Narrative
Administrative Review 4 CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
11. Section 4-203.E.10. Construction Schedule.
Construction schedule indicating the anticipated starting and completion time periods of
the site Grading and/or construction sequence, including the installation and removal of
erosion and sediment control measures, and the estimated duration of exposure of each
area prior to the completion of temporary erosion and sediment control measures.
The proposed UIC well involves the conversion of an existing drilled but not completed
well located on an existing well pad. Additional construction activities associated with
the conversion of the subject well to develop the well into a UIC well are listed below.
Stage/ Activity Time Interval (Days) Projected
Schedule
Well Conversion 14 2023*
Injection Equipment
installation
20 2023*
*Subject to permit approval and equipment availability.
12. Section 4-203.E.11. Permanent Stabilization.
A brief description of how the site will be stabilized after construction is completed.
Cut and fill work for Well Pad 25A is complete. The well pad was constructed in
approximately 2008. The well pad surface and cut slopes are stable and compacted.
The berms on fill slopes are compacted and vegetated. The well pad has no
uncontrolled stormwater. The well pad berms have approximately 80 percent vegetative
cover on the outside slopes to stabilize the berms. Well Pad 25A has a surface layer of
1-inch aggregate base coarse screened to 3-inch minus. CPX will add an additional 4 to
6 inches of aggregate to support proposed activities, including the conversion of the
TPR 176-25 well into an injection well.
The Well Pad 25A fill slopes have 2-foot-high earthen berms, compacted to 95 percent
soil/moisture density. Stormwater controls on the well pad consist of the 6-inch-diameter
drain at the center of the well pad. The drain is piped outside of the berm to a trench.
The trench drains to a catchment basin where solids settle for removal and the
stormwater evaporates. The access road has a borrow ditch on the upslope side where
stormwater is diverted to 18-inch and 24-inch culverts placed at 600-foot intervals along
the roadway.
Areas of interim reclamation will be seeded for long term stabilization. Interim
reclamation measures will comply with all COGCC requirements.
13. Section 4-203.E.12. Erosion Control Measures.
Plan view drawings of all erosion and sediment control measures showing approximate
locations and site drainage patterns for construction phases and final design elements.
CPX TPR 176-25 UIC Well
Article 4 Section 203.E
Grading and Drainage Plan Narrative
Administrative Review 5 CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
Text may be necessary to accompany and explain the drawings. Typical erosion control
measures should be depicted using standard map symbols.
The Well Pad 25A drainage features and stormwater controls are detailed in the
Stormwater Figure located in the Grading and Drainage tab. CPX and/or its certified
contractors will perform regular maintenance of BMPs. These controls and BMPs will be
modified after interim reclamation of Well Pad 25A.
14. Section 4-203.E.13. Estimated Cost.
Estimated total cost, including installation and maintenance, of the required temporary
soil erosion and sediment control measures.
There are no temporary soil erosion and sediment control measures associated with the
proposed UIC well.
15. Section 4-203.E.14. Calculations.
Any calculations made for determining rainfall, Runoff, sizing any sediment basins,
diversions, conveyance, or detention/retention facilities.
There are no new construction activities associated with the conversion of the TPR 176-
25 Well into an injection well. Well Pad 25A is a fully constructed and established well
pad. The now fully revegetated sediment basin has always been adequate to contain
stormwater from storm events and snowmelt runoff.
16. Section 4-203.E.15. Neighboring Areas.
A description of neighboring areas with regard to land use and existing pertinent
features such as lakes, streams, structures, roads, etc.
The subject parcel is zoned Rural. All adjacent parcels are zoned Rural or Public Lands
in Garfield County. Existing use of adjacent property and neighboring properties are
natural resources extraction, public lands, and limited agricultural.
A private network of access roads exists in the Tepee Park Ranch operations area.
CPX owns, maintains, and utilizes private access roads that are adjacent to the site.
There are no streams, areas subject to flooding, high ground water areas, and lakes
within the perimeter of the site. Surface Hydrology Map and a narrative exhibit
describing the hydrology surrounding Well Pad 25A is located in the Grading and
Drainage Plan tab.
17. Section 4-203.E.16. Stormwater Management.
A description of the stormwater management planning concept for the site, including
both structural and nonstructural best management practices.
CPX TPR 176-25 UIC Well
Article 4 Section 203.E
Grading and Drainage Plan Narrative
Administrative Review 6 CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
Well Pad 25A was designed and constructed with site specific stormwater controls
depicted in the Stormwater Figure in the Grading and Drainage Plan tab.
18. Section 4-203.E.17. Stormwater Management Plan.
Copy of the stormwater management plan application to CDPHE with date of submittal.
CPX will adhere to the Tepee Park Ranch Stormwater Management Plan (SWMP)
detailing stormwater BMPs, controls, and inspections. Due to the size of the SWMP, the
plan was not provided in the Administrative Review application, but CPX can provide any
information to Garfield County upon request.
The approved Stormwater Permit (Certification Number: COR401163) issued by CDPHE
on April 1, 2019, is located in the Grading and Drainage Plan tab..
19. Section 4-203.E.18. Reclamation, Revegetation and Soil Plan.
A plan that includes the following information and is consistent with the standards in
section 7-208.
The expected lifespan of the proposed UIC well is approximately 30 years. Wells in the
Piceance Basin may produce for up to 30 years; therefore, the proposed support facility
will operate the same duration as the wells may produce. Interim reclamation will occur
at the site after CPX’s 34 natural gas wells are drilled and completed and will adhere to
BMPs and requirements set forth by COGCC. Reclaimed areas will be vegetated with
approved seed mix in order to reduce erosion and prevent fugitive dust.
CPX has provided a Weed Management Plan in the Maps and Plans tab.
20. Section 4-203.E.19. Hydraulic Calculations.
Hydrologic, hydraulic, and all other calculations used to size and design drainage
facilities and/or structural BMPs.
There are no new construction activities associated with the conversion of the TPR 176-
25 Well into an injection well. Well Pad 25A is a fully constructed and established well
pad. The now fully revegetated sediment basin has always been adequate to contain
stormwater from storm events and snowmelt runoff.
21. Section 4-203.E.20. Maintenance Requirements.
Maintenance requirements for all proposed BMPs should be discussed including
access, schedules, costs, and designation of a responsible party.
CPX TPR 176-25 UIC Well
Article 4 Section 203.E
Grading and Drainage Plan Narrative
Administrative Review 7 CPX Piceance Holdings, LLC
Garfield County, Colorado 34 S. Wynden Drive, Suite 240
2022 Houston, TX 77056
CPX will oversee maintenance of the TPR 176-25 UIC Well during conversion, interim
reclamation, and operations. CPX will comply with all COGCC and other state and
federal requirements.
There are no new construction or grading activities associated with the conversion of
the TPR 176-25 Well into an injection well. Well Pad 25A is a fully constructed and
established well pad. No specific grading, construction, or stormwater BMPs are being
proposed as part of this application.
22. Section 4-203.E.21. Spill Prevention Control and
Countermeasures Plan, if Applicable.
A SPCC Plan will be required for any facility with the potential to discharge oil of any
kind or in any form including, but not limited to, petroleum, fuel oil, sludge, oil refuse and
oil mixed with wastes, in quantities that may be harmful to navigable water and
adjoining shoreline, per EPA regulations.
CPX maintains a Spill Prevention, Control, and Countermeasure (SPCC) Plan
developed in March 2020.