HomeMy WebLinkAbout20200821.tiffUSE BY SPECIAL REVIEW (USR) APPLICATION
FOR PLANNING DEPARTMENT USE:
AMOUNT
APPLICATION RECEIVED BY
DATE RECEIVED:
CASE # ASSIGNED:
PLANNER ASSIGNED:
PROPERTY INFORMATION (Attach additional sheets if necessary.)
Is the property currently in violation? o No I ❑ Yes Violation Case Number:
Site Address: N/A
Parcel Number: °
0 4 3 _3 3 g _0 0 _g 0 2
Le al Description: ALL 33 12 63 EXC UPRR RE Section: 33
g
, Township 12
N, Range 63
Zoning District: A Acreage: 636 Within subdivision? 0 No / ■ Yes Townsite?
0
No O Yes
If yes, subdivision or townsite name:
Floodplain No / Yes Geological Hazard 0 No I ■ Yes Airport Overlay 0 No I ■ Yes
0
PROPERTY OWNER(S) (Attach additional sheets if necessary)
Name:
Company: Peters 313 Ranch, Inc.
Name of proposed business:
Phone #: 970-895-2305
Email:
Street Address: Po Box M
City/State/Zip Code: Carpenter, WY 82054
Name:
Company:
Phone #:
Email:
Street Address:
City/State/Zip Code:
APP LI ANT/AUTHORIZED AGENT (Authorization must be included if there is an Authorized Agent.)
Name: Doug Dennison
Company: HighPoint Operating Corporation
Phone #: 970-353-0407 x6015
Email: ddennison@hpres.00m
Street Address: 33105 WCR 33
City/State/Zip Code: Greeley, CO 80631
I (We) hereby depose and state under penalties of perjury that all statements, proposals, and/or plans
submitted with or contained within the application are true and correct to the best of my (our) knowledge.
All fee owners of the property must sign this application. If an Authorized Agent signs, an Authorization
Form signed by all fee owners must be included with the application. If the fee owner is a corporation,
evidence must be included indicating the signatory has the legal authority to sign for the corporation.
•
S�ture
Doug Dennison
Print
11/27/19
Date
Signature Date
Print
7/29/2019 7
DEPARTMENT OF PLANNING AND BUILDING
DEPARTMENT OF PUBLIC HEALTH AND ENVIRONNMENT
1555 NORTH 17TH AVENUE
GREELEY, CO 80631
AUTHORIZATION FORM FOR BUILDING, PLANNING AND HEALTH DEPARTMENT PERMITS
AND SERVICES
Peters 313 Ranch, Inc.
I, (We), , g i re permission to
Doug Dennison (HighPoint Resources)
(Owner — please print) (Applicant/Agent — please print)
to apply for any Planning, Building or Health Department permits or services on our behalf, for the property
located at:
Parcel 004333000002
NW 33 12 63.00
Legal Description: of Section , Township N, Range
Subdivision Name: Lot Block
Property Owners Information:
970-895-2305
Phone: E-mail:
Applicant/Agent Contact Information:
970-353-0407 x6015
Phone: E -Mail:
ddennison@hpres corn
Email correspondence to be sent to: Owner _E_ Applicant/Agent Both__
■
Postal service correspondence to be sent to: (choose only one) Owner IL ApplicantlAgent
Additional Info:
,rte 2Owner Signature: -t,-_, Date:
10/
Owner Signature:
Date:
0
/1
7/29/2019 9
HighPoint
RESOURCES
USR QUESTIONNAIRE
FOX CREEK 33 Compressor Station
Planning Questions: Planner on Call 970-400-6100
1. Explain, in detail, the proposed use of the property. Include, at a minimum, the following:
a. Type of use for which the application is being made.
HighPoint Operating Corporation (HPOC) is proposing to construct a compressor
station in the Agriculture (A) zone district in the NWSW Section 33, T 12N, R 63W. The
station will be located on property owned by Peters 313 Ranch, Inc. The station will be
permitted for three natural gas -powered compressors; however, it is possible that only
1-2 compressors will be installed initially. In additional, associated equipment such as
control room building, production equipment, tanks and meters will be installed at the
site. The station will be fenced to keep livestock and unauthorized individuals out and
will be equipped with lights that can be controlled so that they are only on when
personnel are present during nighttime hours.
b. Current or previous use of the land, if any.
The proposed facility will be located on lands that are currently non -irrigated rangeland
located in a rural area with existing oil and gas activity. The placement and size of the
facility will allow for the current agricultural to persist.
c. Include a statement delineating the need for the proposed use.
Due to increased production of oil and gas in the area surrounding the proposed
compressor station, there is a need for additional compression to serve two purposes
that are critical to ongoing and expanded production. Compressors on this location will
be used to compress natural gas so that it can be introduced into third -party gathering
systems to be transported to processing plants and, ultimately, to the market. The
second function of these compressors will be for gas lift which is a technique by which
natural gas produced on nearby well locations is compressed and reinjected down hole
into those wells to lift liquids (oil and water) to the surface without the need for pump
jacks or other mechanical pumping systems.
d. Describe the uses surrounding the site and explain how the proposed use is compatible
with them.
The proposed Fox Creek 33 Compressor Station is surrounded by agricultural
properties and is located in an area with existing oil and gas activity. The compression
of natural gas is a necessary component of the oil and gas industry; therefore, the
proposed use is compatible to the surrounding land use.
e. Describe the proximity of the proposed use to residential structures.
There are no residential structures within approximately 7,400 feet of the proposed Fox
Creek 33 Compressor Station.
f. Describe the hours and days of operation (e.g. Monday thru Friday 8:00 a.m. to 5:00
p.m.).
g
The facility will operate 24 hours a day, seven days a week. However, typical access in
and out of the facility will occur during daylight hours except during maintenance
situations in which the station is not operating at peak efficiency or other situations that
could require immediate attention.
. Describe the number of shifts and the maximum number of employees per shift.
After construction has been completed, the station will be unmanned. The station will
be monitored and operated remotely, and personnel will visit the station on an as -
needed basis.
h Describe the maximum number of users, patrons, members, buyers or other visitors
that the use by special review facility is designed to accommodate at any one time.
As noted above, the station will be unmanned, so no personnel will work at the station
on a full-time basis. HPOC and contractor personnel will visit the station intermittently
and, excluding off -normal situations, primarily during daylight hours.
During the construction phase, upwards of 20 personnel could be on site at peak
construction times. The construction phase is slated to last approximately 19 weeks.
During operations phase, the station will be visited by up to 2 people (pumper,
mechanic) each day for maintenance for short periods. In addition, at least once a
month, for a period of two to three days, the site would be visited by approximately
three trucks for schedule monthly maintenance. Approximately one tanker truck per
day will visit the station to transport oil.
i. List the types and maximum numbers of animals to be on the site at any one time (for
dairies, livestock confinement operations, kennels, etc.).
Not Applicable.
j. List the types and numbers of operating and processing equipment to be utilized.
3 natural-gas compressors in skid -mounted buildings
4 combustors
2 fuel -gas scrubbers
1 knockout drum
3 840 -barrel oil tanks
1 840 -barrel water tank
1 slug catcher
1 heater treater
3 2 -phase separators
3 filter coalescers
1 vapor recovery tower (VRT)
4 vapor recovery units (VRU)
1 air compressor with possible building
Meters with possible building
k. List the types, number and uses of the proposed structures to be erected.
Each of the 3 natural-gas compressors will be contained in pre -fabricated (Resolution
35 certified) skid -mounted steel frame buildings. It is possible that the air compressor
and meters will be housed in small buildings, and the appropriate permits for these
buildings will be obtained from Weld County.
I. Describe the size of stockpile, storage or waste areas to be utilized, if any.
See below under "Environmental Health Questions" for detail of how wastes will be
managed.
m. Describe the method and time schedule of removal or disposal of debris, junk and
other wastes associated with the proposed use.
As noted below under "Environmental Health Questions", contractors will be utilized
to empty/replace dumpsters and other waste containers on a regular basis.
n. Include a time table showing the periods of time required for the construction of the
operation.
The following is a general time table for the major phases of construction -
- Civil/dirt work — 1 week
- Delivery and installation of equipment —16 weeks
- Commissioning — 2 weeks
Describe the type of lot surface proposed and the square footage of each type (e.g.
asphalt, gravel, landscaping, dirt, grass, buildings).
All access roads and the compressor station site and associated equipment area will
be graveled.
o. How many parking spaces are proposed? How many handicapped (ADA) parking
spaces are proposed?
Not applicable.
p. Describe the proposed screening for all parking and outdoor storage areas.
Not applicable.
q. Describe the existing and proposed landscaping for the site.
All access roads and the compressor site and associated equipment area will be
graveled. No vegetation will be within the station footprint for safety (fire hazard)
reasons.
r. Describe the type of fence or other screening proposed for the site.
The facility will be surrounded by a barbed-wire fence to preclude livestock from
entering the facility. No screening is proposed at this time.
s. Describe reclamation procedures to be employed as stages of the operation are
phased out or upon cessation of the Use by Special Review activity.
If the station is removed in the future, HPOC would reclaim the site to its original
state.
t. Describe the proposed fire protection measures.
This facility will be constructed with equipment that will detect conditions where fire or
explosion could occur. This equipment includes LEL (lower explosive limit) meters and
fire eyes that will be configured to immediately and automatically shut the facility down
if a dangerous situation is present. Additionally, appropriate fire extinguishers will be
installed throughout the facility and BBC personnel will receive regular training on the
maintenance and use of the extinguishers.
The primary fire response agency for this facility will be the Pawnee Fire Protection
District. Prior to operation of the facility, HP0C will provide an emergency response
plan to the fire district and conduct a walk-through of the facility with district personnel
to familiarize them with the facility.
2. Explain how this proposal is consistent with the Weld County Comprehensive Plan.
HPOC has reviewed the Comprehensive Plan as outlined in Chapter 22 of the Weld
County Code and believes this project is consistent with its guiding principles. Section 22-
2-10(D) emphasizes extraction of natural resources as an important part of the economy
and should minimize impacts to agricultural lands. The proposed facility will be located on
lands that are currently non -irrigated rangeland located in a rural area with existing oil and
gas activity►. The placement and size of the facility will allow for the current agricultural to
persist
3. Explain how this proposal is consistent with the intent of the zone district in which it is
located. (Intent statements can be found at the beginning of each zone district section in
Article III of Chapter 23.)
The natural gas compressor station is classified by Weld County as an Oil and Gas
Support and Services facility. Section 23-3-40.A.2 of the Weld County Code states that
these facilities are uses allowed to be constructed, occupied, operated and maintained in
the A (Agricultural) Zone District only upon approval of a Use by Special Review permit in
accordance with the requirements and procedures set forth in Article II, Division 4 of
Chapter 23.
4. Explain how this proposal will be compatible with future development of the surrounding
area or adopted master plans of affected municipalities.
The surrounding area is used for agricultural (dry -land grazing) and oil and gas production.
The facility will be constructed and maintained to limit the impact to agricultural operations.
The facility is a key component to existing and future oil and gas development in this area.
5. Explain how this proposal complies with Article V and Article XI of Chapter 23 if the
proposal is located within any Overlay Zoning District (Airport, Geologic Hazard, or Historic
Townsites Overlay Districts) or a Special Flood Hazard Area identified by maps officially
adopted by the County.
The proposed Fox Creek 33 Compressor Station location is not located within an Overlay
Zoning District.
6. If the proposed use is to be located in the A (Agricultural) Zone District, explain your efforts
to conserve prime agricultural land in the locational decision for the proposed use.
The location for the proposed Fox Creek 33 Compressor Station is classified as High
Potential Dry Cropland — Prime if they Become Irrigated. At the current time, there are no
plans for these lands to be irrigated and the lands likely will continue to be used for
livestock grazing. The location for the compressor station was chosen to be in close
proximity to an existing well pad to limit the overall impact to ongoing agricultural
operations and the station will be fenced to prevent livestock from being able to access the
facility
7. Explain whether this proposal interferes with the protection of the health, safety and
welfare of the inhabitants of the neighborhood and the County.
Because of the rural and relatively isolated location proposed for this compressor station, it
will not interfere with the protection of the health, safety and welfare of neighbors and the
County.
Environmental Health Questions: 970-400-2702
1. What is the drinking water source on the property? If utilizing a drinking water well include
either the well permit or well permit application that was submitted to the State Division of
Water Resources. If utilizing a public water tap include a letter from the Water District, a
tap or meter number, or a copy of the water bill.
Because the site will be unmanned, no drinking water source is required. Personnel who
visit the station will be provided with bottled water.
2. What type of sewage disposal system is on the property? If utilizing an existing septic
system provide the septic permit number. If there is no septic permit due to the age of the
existing septic system, apply for a septic permit through the Department of Public Health
and Environment prior to submitting this application. If a new septic system will be installed
please state "a new septic system is proposed." Only propose portable toilets if the use is
consistent with the Department of Public Health and Environment's portable toilet policy.
The station will be equipped with a portable toilet that will be serviced by a licensed
contractor.
3. If storage or warehousing is proposed, what type of items will be stored?
No storage or warehousing is proposed.
4. Describe where and how storage and/or stockpile of wastes, chemicals, and/or petroleum
will occur on this site.
HPOC maintains a corporate Waste Management Plan that covers the management of
wastes typically associated with our operations. This plan is used to determine how to
manage common wastes. The objective of the plan is to ensure that generation of wastes
is minimized and materials are reused or recycled whenever possible. When that is not
possible, the plan is utilized to ensure that wastes are managed in accordance with all
Local, State, and Federal regulations. HPOC personnel are trained on waste
management practices. HPOC anticipates that the following wastes will be generated at
the site.
• Used oil
• Used antifreeze (ethylene glycol)
• Tank bottoms
• Spent filters
• Light bulbs
• Spent batteries
• Rags and absorbent socks and pads
• Hydrocarbon impacted oil from minor leaks and vehicle traffic
• Used packaging material, including cardboard, scrap lumber from crates,
metal strapping, etc.
A small dumpster will be placed on site and municipal solid waste will be managed by
Waste Management Incorporated or similar company. The dumpster will be emptied
weekly or bi-weekly. A RCRA Universal Waste program will be set up and managed by
Clean Harbors Incorporated for the proper management or recycling of universal wastes
such as spent batteries and light bulbs. Used oil, antifreeze, filters, and rags and pads will
be managed by either January Environmental Services Incorporated or Tri-State Oil
Reclaimers. When necessary, tank bottoms will be removed and sent to an authorized
disposal facility. This activity will be coordinated by Clean Harbors Incorporated. In
addition, a licensed contractor will provide portable toilet service on location. Spills and
releases will be managed in accordance with the facilities SPCC Plan and HPOC's
Emergency Response Plan. Hydrocarbon impacted soils will be removed from the facility
as needed and disposed of at Waste Management Incorporated's landfill in Ault, Colorado.
In the event a change in contractors is necessary in the management or disposal of waste,
a state authorized provider would be utilized.
Oil and produced water that are separated from the natural-gas stream on this location will
be stored in 840 -bbl tanks prior to being transported from the location. These tanks will be
surrounded by a steel -ring and synthetic liner secondary -containment system. The oil and
water will be transported from the location periodically via tanker truck.
5. If there will be fuel storage on site, indicate the gallons and the secondary containment.
State the number of tanks and gallons per tank.
Not applicable.
6. If there will be washing of vehicles or equipment on site, indicate how the wash water will be
contained.
Not applicable.
7. If there will be floor drains, indicate how the fluids will be contained.
Not applicable.
8. Indicate if there will be any air emissions (e.g. painting, oil storage, etc.).
The Fox Creek 33 Compressor Station will have air emissions associated with the
proposed equipment. The facility will be permitted through and subject to the regulations
promulgated by the Colorado Department of Public Health and Environment (CDPHE).
9. Provide a design and operations plan if applicable (e.g. composting, landfills, etc.).
Not applicable.
10. Provide a nuisance management plan if applicable (e.g. dairies, feedlots, etc.).
Not applicable.
11. Additional information may be requested depending on type of land use requested.
Not applicable.
Public Works Questions: 970-400-3767
1. Include a traffic narrative with the information below. A traffic impact study may be required.
Improvements to adjacent streets/roads may be necessary to provide adequate safe and
efficient transportation to and from the site. A.n Improvements Agreement may be required.
a. The projected number of vehicle trips (average per day, maximum per day, peak hour
data) to and from the site and the type of vehicles (passenger, semi -truck, etc.).
Post -construction traffic will consist of 2-3 round trips per day for passenger vehicles
(pickup trucks) and one round trip per day for a semi -truck. The peak hours for this
traffic will vary but will generally be between the hours of 8 a.m. and 5 p.m.
b. Describe how many roundtrips/day are expected for each vehicle type: Passenger
Cars/Pickups, Tandem Trucks, Semi-Truck/Trailer/RV (Roundtrip = 1 trip in and 1 trip
out of site).
Post -construction traffic at the station will consist of 2-3 round trips per day for
passenger vehicles (pickup trucks) and one round trip per day for semi -trucks.
c. Describe the expected travel routes for site traffic.
All traffic accessing the station will travel west of WCR 71 on WCR 132 to an access
point that has been permitted with Weld County (API9-00013).
d. Describe the travel distribution along the routes (e.g. 50% of traffic will come from the
north, 20% from the south, 30% from the east, etc.).
100 percent of the traffic will come west from WCR 71 as described above. It is
estimated that approximately 90 percent of the traffic on WCR 71 will come from the
south with the remainder coming from the north.
e. Describe the time of day that you expect the highest traffic volumes to and from the
site.
The majority of traffic will occur during the hours of 8 a.m. to 5 p.m.
2. Describe where the access to the site is planned.
Proposed access to the site would be from WCR 132 and an access point that has been
permitted with Weld County (AP19-00013).
3. Drainage Design: Design and construction of a detention pond as described in an approved
Drainage Report is required unless the project falls under an exception to stormwater
detention requirements per code. (See below.) Does your site qualify for an exception to
stormwater detention? If so, describe in a drainage narrative the following:
a. Which exception is being applied for? Include supporting documentation.
b. Does the water flow onto the property from an offsite source? If so, from where?
c. Describe where the water flows to as it leaves the property.
d. Describe the direction of flow across the property.
e. Describe the location of any irrigation facilities adjacent to or near the property.
f. Describe any previous drainage problems with the property.
HPOC has prepared a Drainage Report for the proposed site; it is included in the
application package and includes the above requested information demonstrating the
exception to stormwater detention requirements.
4. If your site does not qualify for an exception, the following applies:
a. A Drainage Report summarizing the detention pond design with construction drawings
and maintenance plan shall be completed by a Colorado Licensed Professional
Engineer and adhere to the drainage related sections of the Weld County Code.
b. The Drainage Report must include a certification of compliance, which can be found on
the Public Works website, stamped and signed by the PE.
c. See the attached Drainage Report Review Checklist.
Not Applicable — see attached Drainage Report.
Building Questions: 970-400-6100
1. List the type, size (square footage), and number of existing and proposed structures. Show
and label all existing and proposed structures on the USR drawing. Label the use of the
building and the square footage.
Each compressor will be housed in a prefabricated, skid -mounted metal framed building of
approximate dimensions of 22' x 40' x 16.5'. All facilities are shown and labeled on the
USR drawing included in this USR Permit Application Package. It is also possible that the
air compressor and meters will be housed in small buildings that will be permitted through
Weld County.
2. Explain how the existing structures will be used for this USR.
There are no existing structures at this location.
3. List the proposed use(s) of each structure.
As noted above, each compressor will be housed in a metal framed building. It is also
possible that the air compressor and meters will be housed in small buildings that will be
permitted through Weld County.
Document
Right of Way Agreement
Pipeline Right of Way and Easement
Access Easement
Surface Facility Agreement
Surface Facility Agreement
Right of Way Agreement
Right of Way Agreement
Right of Way Grant Agreement
Right of Way Agreement
Pipeline Easement
Pipeline Right of Way Grant
Memorandum of Access and Damage Settlement Agreement
Right of Way Grant Agreement
Surface Owner's Agreement
Easement
Recording # Grantee
4520670 Summit Midstream Niobrara, LLC
4520341 High Point Operating Corporation
4489022
4489023
4489024
4489020
4489021
4479536
4371843
4192690
4140893
3766463
2579050
1869720
1786327
Summit Midstream Niobrara, LLC
Summit Midstream Niobrara, LLC
Summit Midstream Niobrara, LLC
Summit Midstream Niobrara, LLC
Summit Midstream Niobrara, LLC
Outrigger DJ Operating LLC
Summit Midstream Niobrara, LLC
Tallgrass Colorado Pipeline, Inc.
EOG Resources, Inc.
EOG Resources, Inc.
KN Interstate Gas Transmission Co.
Champlin Petroleum Company
Tri-State Generation & Transmission Association, Inc.
Address
999 18th St., #25005, Denver, CO 80202
555 17th St., #3700, Denver, CO 80202
999 18th St., #25005, Denver, Co 80202
999 18th St., #25005, Denver, CO 80202
999 18th St., #25005, Denver, CO 80202
999 18th St., #25005, Denver, CO 80202
999 18th St., #25005, Denver, CO 80202
1200 17th St., #900, Denver, CO 80202
999 18th St., #2500S, Denver, CO 80202
370 Gordon St., Lakewood, CO 80228
60017th St., #1100, Denver, CO 80202
600 17th St, #1100, Denver, CO 80202
PO Box 281304, Lakewood, CO 80228-8304
No Address Shown -possibly Anadarko, Oxy
12076 Grant St., Thornton, CO 80241
Weld County Treasurer
Statement of Taxes Due
Account Number R0041586
Parcel 004333000002
Legal Description
8204 ALL 33 12 63 EXC (JPRR RES (4R)
Account: R0041586
PETERS 313 RANCH INC
PO BOX M
CARPENTER, WY 82054-0397
Slats Address
•sa••••ai••••aaa■■■■a•awaa■■■aaaaasa.■■■■..■•a.assi.■■■a■a■ea•••saasa..■■■.*siiu uaaaaaS•auaaaasaaara■■•aa■■■■■■usaaatasaI
Year
2018
Charges
Tax
Billed
$92.46
Payments
$92.46
Balance
$0.00
Grand Total Due as of 10:-212019
S0.00
Tax Billed at 2018 Rates for Tax Area 1204 - 1204
Authority
WELD COUNTY
SCHOOL DIST RE 12
PAWNEE FIRE
AIMS JUNIOR COLLEGE
HIGH PLAINS LIBRARY
WEST GREELEY CONSERVATION
Taxes Billed 2018
* Credit Levy
Mill Levy
15.0380000*
9.0320000
1.2500000
6.3050000
3.25 20000
0.4140000
Amount
$39,41
$23.66
$127
$16.52
$8.52
$1.08
35.2910000
$92.46
Values
AG -GRAZING LAND
Total
Actual Assessed
$9,030 $2,620
$9,030 $2,620
ALL TAX LIEN SALE AMOUNTS ARE SUBJECT TO CHANGE DUE TO ENDORSEMENT OF CURRENT TAXES BY THE
LIENHOLDER OR TO ADVERTISING AND DISTRAINT WARRANT FEES.
CHANGES MAY OCCUR AND THE TREASURER'S OFFICE WILL NEED TO BE CONTACTED PRIOR TO REMITTANCE AFTER THE
L., •• a a as R•a A1• ■ 1 R • • • -
Weld County Treasurer's Office
1400 N 17th Avenue
PO Box 458
Greeley, CO 80632
Phone: 970-400-3290
Pursuant to the Weld County Subdivision Ordinance, the attached Statement of Taxes Due
issued by the Weld County Treasurer are evidence that as of this date, a I l current and prior year
taxes relater to this parcel have been paid in full,
Signed: Date:
WELD COUNTY, COLORADO
Drainage Report
HIGHPOINT OPERATING CORPORATION
Fox CREEK 33 NW
COMPRESSOR SITE
DRAINAGE REPORT
SECTION 33, TOWNSHIP 12 NORTH, RANGE 63 WEST, 6TH P.M.
COUNTY ROAD 136.5, WELD COUNTY, COLORADO
Prepared For.
HighPoint Operating Corporation
Contact: Doug Dennison
33105 WCR 33
Greeley, CO 80631
Phone: (970) 353-0407x6015
Prepared By:
Uintah Engineering & Land Surveying, LLC
Christopher J. Clark, PE
85 South 200 East
Vernal, UT 84078
Phone: (435) 789-1017
ftWit
uINrAH
ENAIP. I + r.L7 SURVEYING
Uintah Engineering & Land Surveying. LLC 85 South 200 East. Vernal, Utah 84078
Fox Creek 33 NW Compressor Site Drainage Report
TABLE OF CONTENTS
Table of Contents i
Certification ii
I. INTRODUCTION 1
II. General Location and Description 1
A. Location and Existing Conditions 1
B. Proposed Development 1
III. Drainage Basins and Subbasins 2
A. Major Basin Description 2
B. Offsite Drainage Basins 2
IV. Drainage Design Criteria 2
V. Drainage Facility Design 4
A. On -site Drainage 4
B. Water Quality and Detention 4
C. Conveyance Calculations (Hydraulic Capacities) S
VI. conclusion 5
VII. Appendix 6
Appendix A — Vicinity Map 6
Appendix B — Drainage Basin Plans 8
Appendix C — Flood Plain Map - FIRM Map Panel 11
Appendix D — Hydrologic Soil Group 13
Appendix E — NOAA Atlas 14 — Precipitation Values 18
Appendix F — Rational Method Runoff Calculations 20
Appendix G — Conveyance Calculations 26
Appendix H — Detention Pond Calculations 34
November 21, 2(119
I
CERTIFICATION OF COMPLIANCE
ENGINEERING DESIGNED TO WELD COUNTY CODE STANDARDS AND CRITERIA
I Christopher J. Clark, PE , Consultant Engineer for HighPoint Resources
("Applicant'), understand and acknowledge that Applicant is seeking land use approval of
Fox Creek 33 NW Compressor ("Application") for the property described in the attached Exhibit
"A." I have designed or reviewed the design ("Design") for the proposed land use set forth in the Application. I hereby
certify, on behalf of Applicant that the Design will meet all applicable drainage requirements of the Weld County Code
with the exception of variance(s) described below. This certification is not a guarantee or warranty either expressed or
implied.
(Engineer's Stamp)
VARIANCE REQUEST
1) Describe the Weld County Code criteria of which a variance is being requested.
2) Describe why it is not possible to meet the Weld County Code.
3) Describe the proposed alternative with engineering rational which supports the intent of the Weld County Code.
I understand and agree that the intention of the Code is to reduce impacts of development on neighboring downstream
properties and the public. I understand if this variance request is approved it is not precedent setting and is based on site
specific constraints.
Planning Director Approval indicated when signed by director or appointee:
Planning Director Name
Signature
Date of approval
1/13/15
Fox Creek 33 NW Compressor Site Drainage Report
I. INTRODUCTION
The purpose of this report is to present the proposed storm drainage improvements for the HighPoint
Operating Corporation's proposed Fox Creek33 NW Compressor site located in the NW1/4 NW 1/4 of Section
33, T12N, R63W, 6th P.M. With the development of a site, it can be expected to increase the impervious
ground cover and thus, an increase in peak storm water runoff. This report examines the undeveloped flow
patterns of off -site and on -site drainage basins and the proposed storm water facilities designed to mitigate the
downstream impact of increased storm water runoff. The contents of this report are prepared in accordance
with the Weld County Code for a Drainage Report in conjunction with a Use By Special Review submittal.
II. GENERAL LOCATION AND DESCRIPTION
N LOCATION AND EXISTING CONDITIONS
The proposed Fox Creek 33 NW Compressor site is located on an approximately 10.5 Acre parcel located
west of the end of WCR 136.5 in Weld County. The location is an existing oil and gas well pad that is currently
operating with (1) one wellhead located on the site. A topsoil stockpile is located on the south side of the pad.
The site will be accessed by a gravel access road located on the east side of the pad that accesses WCR 132
to the south. The vehicle travel areas of the site is surfaced with gravel. A vicinity map of the proposed site is
included in Appendix A. This site is zoned Agricultural and is Non -Urbanizing. The existing land use is
considered rangeland. HighPoint Operating Corporation is seeking to permit this development to operate an oil
and gas compressor facility.
Drainage at the proposed site currently sheet flows to the northeast across the rangeland. An unnamed
drainage lies approximately 500 feet to the northeast of the proposed site, which is a tributary of Little Crow
Creek. The Off -Site Drainage Plan for the site is included with this report in Appendix B.
PROPOSED DEVELOPMENT
The improvements will include the development of the existing well pad into a compressor site with a proposed
use area of approximately 6.16 Acres in size and will include (3) three compressors and ancillary equipment
including scrubbers, storage tanks, filters and separators. There will be one detention pond located in the
northeast corner of the proposed site.
Offsite stormwater runoff will be collected into diversion ditches and will discharge through a riprap apron before
being released into the historic drainage basin. Stormwater on the proposed pad will be collected into a series
of ditches and will be conveyed into a detention basin located at the northeast corner of the site.
The detention pond is sized to accommodate the 100 -year runoff volumes from the existing pad and newly
developed areas and will release the stormwater at a rate equivalent to the 10 -year historic (pre -development)
runoff rate. The release rate will be managed by the use of an outlet structure with an orifice plate to treat and
manage the Water Quality Capture Volume and then a second stage will discharge through an outlet pipe that
is outfitted with a restrictor plate.
The offsite drainage plan and developed drainage plan have been attached to this report in Appendix B.
November 21, 1)19
1
Fox Creek 33 NW Compressor Site Drainage Report
III. DRAINAGE BASINS AND SUBBASINS
A. MAJOR BASIN DESCRIPTION
The subject property is located in rural Weld County and is surrounded by agricultural land to the west and
rangeland to the north, south and east. Several mineral, oil and gas facilities operate in nearby vicinity. The
project site lies in a FEMA designated area. Zone X: "areas determined to be outside the 0.2% annual
chance floodplain". The development site is located in Flood Insurance Rate Map (FIRM), Community Panel
No. 08123C 0400E, attached to this report as Appendix C.
According to the NRCS Web Soil Survey, the off -site basin consists of Ascalon fine sandy loam, 0 to 6
percent slopes. The on -site soils consist of Ascalon fine sandy loam, 0 to 6 and Ascalon sandy loam, 5 to 9
percent slopes. The Ascalon fine sandy loam have high infiltration rates (low runoff potential) when
thoroughly wet. The hydrologic soil group types at the compressor pad are Type B. Refer to the web soil
survey reports included with this report in Appendix D.
OFFSITE DRAINAGE BASINS
Off -site drainage basin 1 (0S-1) flows from the northwest to directly west of the site. The runoff from OS -1 is
collected into Off -site Ditch -1. Off -site Ditch -1 conveys the runoff to a riprap apron where it is discharged into
the historic drainage basin. Off -site Ditch -1 is an existing ditch with 3 to 1 side slopes and an approximated
depth of 6 inches. It will need to be improved by increasing the depth of the ditch to a minimum of 12 inches.
Off -site drainage basin 2 (0S-2) flows from the west of the site to the south of the site. The runoff from OS -2 is
collected into Off -site Ditch -2, which conveys the flow to a riprap apron on the southeast of the site, where it is
discharged into the historic drainage basin.
Runoff coefficients are calculated for each site soil type using the methods detailed in the Urban Storm
Drainage Criteria Manual. Volume 1. Ch. 5. The Rational Method will be used to analyze the historic peak
flows. The time of concentration for the basin was estimated using the methods detailed within the Urban
Storm Drainage Criteria Manual, Volume 1. Ch. 5.
Peak flows for the 5 -year and 100 -year storm events for the off -site drainage basin have been provided in
the table below.
Table 1 - Off -site Drainage Basins Peak Runoff Flows.
Basin ID
Basin Size ( Ac
Peak Flow
5-Yr (cfs)
Peak Flow
100-Yr (cfs
Design Point
0S-1
81.4
4.0
37.2
1 _
0S-2
10.9
1.1
10.5
2
A Drainage Plan is included with this report showing the boundary of the off -site Drainage Basin. Reference
the Off -site Drainage Plan in Appendix B.
IV. DRAINAGE DESIGN CRITERIA
This report is prepared in compliance with the Urban Storm Drainage Criteria Manual. Volumes 1, 2, and 3:
November 21, 2019
Fox Creek 33 NW Compressor Site Drainage Report
Weld County Code; and the Weld County Storm Drainage Criteria Addendum to the Urban Storm Drainage
Criteria Manuals Volumes 1, 2. and 3. Based on this criterion. a 100 -year storm is used as the major storm
event and a 5 -year storm is used as the minor storm event when evaluating existing and proposed drainage
facilities.
Runoff Calculations: For drainage basins less than 160 acres in area, the Rational Method was used to
calculate the stormwater runoff. The time of concentraction for the basins was estimated using the methods
detailed within Urban Storm Drainage Criteria Manual. Volume 1, Ch. 5. The hydrologic runoff calculations
and time of concentration calculations are included with this report in Appendix F.
Rainfall Data: Site rainfall depth information was obtained from the National Oceanic and Atmospheric
Administration (NOAA) Atlas 14. Volume 8, Version 2, Precipitation -Frequency Atlas of the United States
(2013). This data supersedes the default rainfall depth information provided in the Urban Storm Drainage
Criteria Manual. The current NOAA data was used for the determination of the point rainfall data. The
NOAA data formed the basis of the inflow -duration -frequency (IDF) calculations for other storm frequencies
and durations using Urban Drainage methods. Rainfall data is presented in Appendix E.
Pipe and Culvert Sizing: Site storm infrastructure capacities have been evaluated using Manning's
Equation. The culverts on -site were sized to convey the 5 -year storm event. The storm drain piping was
also sized to convey the 5 -year storm event. Additionally, the outlet pipe from the detention pond is sized for
a specific release rate of the 5 -year historic flow with the use of a restnctor plate. Erosion control devices
will be provided at all culvert and swale outlets to protect against downstream erosion. Culvert sizes were
determined using Hydraflow Express software Pipe sizing calculations were determined using Hydraflow
Express software. The hydraulic calculations for Pipe and Culvert Sizing are included in this report in
Appendix F.
Drainage Channel Sizing: Irrigation ditch, diversion ditch, or swale capacities have been evaluated using
Manning's Equation. The channels are sized to convey the 5 -year storm event runoff flows. They were
checked to ensure that their capacities are capable of conveying the 100 -year storm event runoff. The
channel capacities were calculated using Hydraflow Express software. The hydraulic calculations for the
Drainage Channels are included with this report in Appendix F.
Detention Pond Sizing: The detention pond volume has been determined using the UDFCD's Detention
Design — UD-Detention v2.34 spreadsheet. Detention Ponds A and B are sized to detain the 100 -year
developed storm event runoff from the site's drainage basins (refer to the drainage basin plans in the
appendix). The detention ponds will be configured to release no more than the 10 -year historic flow at the
points of analysis in accordance with Weld County criteria A minimum of one foot of freeboard will be
provided for the detention pond. The required water quality capture volume will be contained within the
detention volume for the detention pond. An emergency spillway. in the form of a concrete weir and armored
slope, is proposed to convey the 100 -year flow rate under a plugged orifice condition with a maximum water
depth of 6 inches. Detailed detention pond calculations have been provided in Appendix G.
Water Quality Pond Sizing: Water quality ponds are required prior to releasing stormwater runoff from the
development. The ponds will include a water quality orifice plate on the outlet structure in accordance with
the Urban Storm Drainage Criteria Manual. The volume added to the detention pond to account for water
quality was determined following UDFCD's Detention Design - UD Detention v2.34 spreadsheet. Detailed
November 21, 2o 1'J
3
Fox Creek 33 NW Compressor Site Drainage Report
water quality pond sizing information is presented in Appendix G.
V. DRAINAGE FACILITY DESIGN
A. ON -SITE DRAINAGE
The compressor facility stormwater management will include the construction of a detention pond, which will
collect the runoff from the two on -site basins. Drainage Basin A includes the northwest portion of the
compressor site. The runoff from Basin A is collected into Pad Ditch -1, which runs along the west and north
edges of the facility and then discharges into the detention pond.
Drainage Basin B includes the southeastern portion of the facility, and the topsoil pile. Pad Ditch -2, which runs
along the southern and eastern edges of the site, will collect stormwater runoff and then convey it through
Culvert -1, which crosses the access road. From Culvert -1 the stormwater will continue to flow in Pad Ditch -2
before it discharges into the detention pond. Pad Ditches 1 and 2 are existing. with an average depth of
approximately 6 inches. They will be improved to have a depth of 12 inches with 3 to 1 side slopes.
Table 2 — On -site Drainage Basins Runoff Flows
Basin ID
Basin Size (Ac)
Peak FloNs
5-Yr (cfs)
Peak Floc
100-Yr (cfs)
Design Point
A
2.10
1.2
4.7
3
B
2.34
1.3
5.8
4 i
The 5 -year runoff flows were used to calculate the catchment ditch depths to convey the runoff to the
Detention Pond.
B. WATER QUALITY AND DETENTION
The proposed water quality feature for the site is a water quality capture pond. The water quality for the
detention pond was sized in accordance with the Urban Storm Drainage Criteria Manual, Volume 1, 2, and 3.
The water quality feature is designed to handle the runoff from the developed portions of the site.
Developed runoff flows are designed to route through the water quality feature. Per Urban Storm Drainage
standards, 120% of the water quality volume will be provided. The proposed water quality volume drain time
is 40 hours. An orifice plate is proposed as the water quality feature affixed to the pond s outlet structure.
The WQCV is included in the detention pond volume for the drainage basins.
WQCV calculations are presented in Appendix G. A storage volume summary is provided in the table below.
As mentioned previously, there is a detention pond designed to collect runoff from the developed site. The
detention ponds collects the runoff and discharges to the outfall point at a rate that does not exceed the 10 -
year historic runoff rate. The following tables presents a summary of the Detention Pond sizing.
November 21. 2019
4
Fox Creek 33 NW Compressor Site
Drainage Report
Table 4 - Detention Pond Summary
Detention Pond Calculations
Drainage Area (acres)
% Impervious of Drainage Area
Time of Concentration (minutes)
Water Quality Capture Volume (ac -ft)
Total Storage (ac -ft)
4.68
31.06
20
0.07
0.33
Additional detention pond calculations, including WQCV orifice plate design, outlet pipe restrictor plate design,
and emergency spillway design, are included in Appendix H of this report.
C. CONVEYANCE CALCULATIONS (HYDRAULIC CAPACITIES)
The conveyances will consist of pad ditches that will collect the runoff from the pad slopes tributary to the ditch.
These pad ditches will convey the runoff around the edges of the pad (perimeter) and discharge into detention
pond before they outfall to the historic drainage. The hydraulic calculations for the ditch and culvert conveyances
are included with this report in Appendix G. The geometric and hydraulic details are shown in the table below.
Table 3 - Conveyance Geometric and Hydraulic Details
Conveyance
Geometric Details
Min. Slope
(%)
5-Yr Peak Runoff
Flow (cfs
Depth at Design
Flow (ft)
Pad Ditch - 1
3:1 V -Ditch 12"D Min.
0.25%
1.2
0.5
Pad Ditch - 2
3:1 V -Ditch 12"D Min.
0.25%
1.3
0.5
Off -site Ditch - 1
3:1 V -Ditch 12"D Mm.
0.5%
3.5
0.8
Off site Ditch - 2
3:1 V -Ditch 12"D Min.
0.5%
1.1
0.5
Culvert -1
18' CMP
0.5%
1.3
1.0
The culvert outlets will be armored with a rip rap apron to dissipate energy and reduce erosion at the outfall
locations. Based on the flow and velocities from the culverts and diversion ditches, the rip -rap will consist of a
Type VL rip -rap (D5o — 6"). The aprons will be 6 feet wide (or to a horizontal plane at 1' depth) by 6 feet long by
12" thick. The hp -rap aprons were sized according to the Section 8.1.1 of the Urban Storm Drainage Criteria
Manual, Volume 1 method. Refer to the Drainage Plans in Appendix C for apron locations.
VI. CONCLUSION
This report was prepared in compliance with the Weld County Code and the Weld County Storm Drainage
Criteria Addendum to the Urban Storm Drainage Criteria Manual Volumes, 1, 2, and 3. The proposed
drainage system for the improvements to the Fox Creek 33 NW Compressor site will provide detention for
the areas section of the site, releasing flows at the 10 -year historic rate. Releases are as near to the points
of design as practical and are not expected to increase or cause adverse impacts on downstream property
owners.
This Drainage Report is being submitted to Weld County for review and approval.
November21. 'ill()
Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX A - VICINITY MAP
November 20, 2019
NOTE: PARCEL DATA SHOWN HAS BEEN OBTAINED FROM VARIOUS SOURCES AND SHOULD BE USED FOR MAPPING, GRAPHIC AND PLANNING
PURPOSES ONLY. NO WARRANTY IS MADE BY UINTAH ENGINEERING AND LAND SURVEYING (UELS) FOR ACCURACY OF THE PARCEL DATA.
PROPOSED LOCATION: FOX
CREEK 33 NW COMPRESSOR
T11N,
LEGEND:
EXISTING ROAD
PROPOSED ROAD
EXISTING PIPELINE
11,44.
I NT
'IGINE ERING R I AND SURVEYING
UELS, LLC
Corporate Office * 85 South 200 East
Vernal, UT 84078 * (435) 789-1017
N HIGHPOINT OPERATING CORPORATION
FOX CREEK 33 NW COMPRESSOR PAD
NW 1/4 NW 1/4, SECTION 33, T12N, R63W, 6th P.M.
WELD COUNTY, COLORADO
_ SI RVEYED BY
J B
08-17-18
SC AI.E _
DR t\%'N BV
S.O T.
11-15-19
1 : 24,000
ACCESS
ROAD MAP
TOPO
B
Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX B - DRAINAGE BASIN PLANS
1. Off -Site Drainage Plan — D-1
2. On -site Drainage Plan — D-2
November 20, 2019
3
I I
EXISTING GRADE
rrr=-'itr-ylt�ltt-�tlf-`�i-
TYPICAL DIVERSION BERM
3 MIN. f 3 MIN.
DIVERSION BERM
(TOPSOIL OR COMMON BORROW)
'II
t7 MIN. SWALE
DEPTH ;MIN.)
TYPICAL OFF -SITE DIVERSION DITCH
r _
3 MIN
17 MIN. SWALE
DEPTH (MIN.)
TYPICAL PAD DITCH
LEGEND:
Ian, DIRECTION OF FLOW ARROW
4 ot1rrLow
— — — DRAINAGE BASIN BOUNDARY
1
Nf(IAINO • I ANC) SURVFvIN.O
UELS. LLC
Corporate Office • 85 South 200 Eau
Vernal. UT 84078 • (435) 789-1017
3 MIN
N
DESIGN POINT
DRAINAGE BASIN DESIGNATION
5-YR WEIGHTED RUNOFF COEFFICIENT
DRAINAGE BASIN AREA (ACRES)
SUMMARY RUNOFF TABLE
DESIGN POINT
BASIN AREA
(Ac)
RUNOFF S-YR
(cfs)
PEAK 100-YR
(ds)
1
81.35
10.91
2.10
2.34
4.0
1.1
37.2
10.5
4.7
5.8
2
3
1.2
1.3
4
HIGHPOINT OPERATING CORPORATION
FOX CREEK 33 NW COMPRESSOR
33. TI2N, R63W, 6TH P.M.
WELD COUNTY, COLORADO
DRAWN BY: S.G.T.
DATE DRAWN: II -21-2019
SCALE I" = I i t
REVISED
OFF -SITE DRAINAGE PLAN
1)- I
OFFSITE DITCH -1
DEPTH - 12' MIN.
31 SIDE SLOPES.
SLOPE MIN 0.5%
5 Year Flow - 4.0 CFS
I
r
I
t
HP -51.8420
4-
on
•
on
/
Ss
1
TYP€ VL RIP -RAP
6Wx6Lx1D
Proposed Fox Creek 33 .VII' Compressor Sue
I
PAD DITCH -1
DEPTH-1TPAN.
3'.1 SIDE SLOPES.
SLOPE MIN. 0.25% 4
V -DITCH '
5 Year Flow • 1.2 CFS ,
Enseng 1 t h le
Be 'frothed
I
4•
PAD DITCH -2
DEPTH - 12' MIN.
DD
HP -5479.56
OFFSITE DITCH -2
DEPTH - 12' MIN.
3.1 SIDE SLOPES,
SLOPE MIN. 0.5%
5 Year Flow - 1.1 CFS
/ /01
ton
•
•
tie Hsi% Berm
I
I
I
I
I'
I
ee
I
'
SYMBOL LEGEND
A
DESIGN POINT
DRAINAGE BASIN DESIGNATION
5•YR WEIGHTED RUNOFF COEFFICIENT
DRAINAGE BASIN AREA (ACRES)
Oatmeal Pond
Detained Vol 13.940 CF
Ben Dims 60' x 100'
Bon ET 5471.9'
Crest El 5475.6'
Spillway B 5474.6
O J
DO
TYPE VL RIP -RAP
6Wx61x1'D
INV-5471.90
INV-5475.76
Culvert -1
I8' Dia x 48' CMP
0 5% Min Slope a-,
INV-5476.02
SOS
PAD DITCH -2
DEPTH - 12' MIN.
31 SIDE SLOPES,
SLOPE MIN. 0.25%
V -DITCH
Exatnj Ditch
To Be krgrored
PAD DITCH -2
DEPTH - 17 MIN.
3'1 SIDE SLOPES,
SLOPE MIN. 025%
V -DITCH
5 Year Flow - 1.3 CFS
A.
as
4
TYPE VL RIP -RAP
6Wx61x1D
J
4.,
INV-5471.74
a-
flax
SUMMARY RUNOFF TABLE
DESIGN POINT
BASIN AREA
(Ac)
RUNOFF 5-YR
(cfs)
PEAK 100-YR
()
1
81.35
1031
2.10
2.34
4.0
37.2
10.5
41
58
2
3
1,1
1.2
1.3
4
LEGEND:
_y DIRECTION OF FLOW ARROW
4. OUTFLOW
DRAINAGE BASIN BOCNDARY
u i NrAH
UELS,LLC
Corporate Office , 115 South 200 East
Vernal, UT 84078 • (435) 789-1017
HIGHPOINT OPERATING CORPORATION
FOX CREEK 33 NW COMPRESSOR
33, TI2N, R63W, 6TH P.M.
WELD COUNTY, COLORADO
DRAWN BY: S.G.T
DATE DRAWN: 11-21-2019
SCALE Is = 70'
REVISED:
ON -SITE DRAINAGE PLAN
D-2
Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX C - FLOOD PLAIN MAP - FIRM MAP PANEL
,, umber 20, 2019
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Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX D - HYDROLOGIC SOIL GROUP
November 20, 20 1 9
1.3
40° 58 sr N
40° 5B cr N
to
m_
m
N
8
544503
A
544700
544900
545130
Hydrologic Soil Group —Weld County, Colorado, Northern Part
Map Scale: 1:11,000 if punted on A landscape (11" x 8.5") sheet.
— — =Meters
0 150 300 600 900
Feet
0 500 1000 2000 3000
Map projection: Web Mercator Comer coordinates: WG584 Edge tics: UrM Zone 13N WGS84
USDA Natural Resources
Conservation Service
I I I I I I
545700 545900 546100 546O03 'i46500 546703
Web Soil Survey
National Cooperative Soil Survey
104° 26 3S W
11/15/2019
Page 1 of 4
40° 58' 51" N
40° 58' 0"N
Hydrologic Soil Group —Weld County, Colorado, Northern Part
MAP LEGEND MAP INFORMATION
Area of Interest (AO!)
Area of Interest (AO')
Soils
Soil Rating Polygons
U A
U
ND
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
..:• A
A/D
^r B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
® ND
■ B
B/D
D C The soil surveys that comprise your AOI were mapped at
1 24,000.
O C/D
D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
r -4-I Rails
ti Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map. Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Weld County, Colorado, Northern Part
Survey Area Data: Version 14. Sep 13, 2019
Soil map units are labeled (as space allows) for map scales
1.50,000 or larger.
Date(s) aerial images were photographed: Oct 22, 2014 —Oct 2,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
USDA Natural Resources Web Soil Survey
a Conservation Service National Cooperative Soil Survey
11/15/2019
Page 2 of 4
Hydrologic Soil Group —Weld County. Colorado, Northern Part
Hydrologic Soil Group
Map unit symbol
Map unit name
Rating
Acres in AOI
Percent of AOl
4
Ascalon fine sandy
loam, 0 to 6 percent
slopes
B
71.8
98.2%
5
Ascalon sandy loam. 5
to 9 percent slopes
B
1.3
1 8%
Totals for Area of Interest
73.1
100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long -duration storms.
The soils in the United States are assigned to four groups (A, B. C. and D) and
three dual classes (A/D. B/D. and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface. and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D. B/D, or C/D). the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
USDA
r
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
11/15/2019
Page 3 of 4
Hydrologic Soil Group —Weld County, Colorado, Northern Part
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff None Specified
Tie -break Rule: Higher
t SDA
a
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
11/15/2019
Page 4 of 4
Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX E - NOAA ATLAS 14 - PRECIPITATION VALUES
November _10, 7019
1$
5/15/2019 Precipitation Fregjency Data Server
NOAA Atlas 14, Volume 8, Version 2
Location name: Grover, Colorado, USA*
Latitude: 40.9724°, Longitude: -104.4466°
Elevation: 5477.63 ft**
* source: ESRI Maps
" source: USGS
POINT PRECIPITATION FREQUENCY ESTIMATES
Sanja Perica, Deborah Martin, Sandra Pavlovic. Ishani Roy, Michael St. Laurent, Carl Trypaluk, Dale
Unruh, Michael Yekta, Geoffery Bonnin
NOAA, National Weather Service, Silver Spring, Maryland
PF tabular I PF graphical I Maps & aerials
PF tabular
[_PDS-based
point precipitation frequency estimates
with 90% confidence
intervals (in inches)1
A verage recurrence interval (years)
Duration
- -_ _ _
1
2
5
10
L 25 j
50
100
Il 200 T
500
I 1000 i
5 -min I
0.256
(0.198-0.333)
0.307
((0.237-0.399)
0.398
((0.307-0.520)
I 0.482
(0.369-0.631)
0.608
(0.455-0.835)
0.714
1(0.521-0.990)
0.828
(0.584-1.17)
0.951
((0.645-1.38)J
1.13
(0.735-1.68)
1.27
(0.804-1.91)
[10 -mm
0.375 (
11(0.347-0.585)
0.450
0.583
1(0.449-0.761)
0.706
(0.540-0.924)
0.890
(0.667-1.22)
1.05
(0.763-1.45)
1.21
(0.855-1.72)
1.39
(0.944-2.03)
1.65
(1.08-2.46)
1.86
(1.18-2.79)
15 -min
1(0.353-0.594)
0.457
0.548
(0.423-0.713)
0.711
(0.547-0.928)
0.860
(0.658-1.13)
1.09
(0.813-1.49)
1.27
(0.930-1.77)
1.48
(1.04-2.10)
1.70
(1.15-2.47)
2.01
(1.31-3.00)
2.27
(1.44-3.40)
30 -min
0.605
(0.468-0.786)
0.727
(0.562-0.946)
0.945
(0.727-1.23)
1.14
(0.874-1.50
1.44
(1.08-1.97)
1.68
(1.23-2.33)
1.95
(1.37-2.76)
2.23
(1.51-3.24)
2.63
(1.72-3.92)
2.96
(1.87.4.44)
60 -min
0.730
(0.564-0.949)
0.892
(0.689-1.16)
1.18
(0.906-1.54)
1.43
(1.10-1.88)
1.82
(136-2.49)
2.13
(1.56-2.95)
2.47
(1.74-3.50)
2.83
(1.92-4.12)
3.35
(2.18-4.98)
3.76
(2.38-5.64)
2fir
0.855
(0.669-1.10)
1.06
(0.826-1.36)
1.41
(1.10-1.82)
1.73
(1.34-2.23)
2.20
(1.66-2.97)
2.58
(1.90-3.53)
3.00
(2.13-4.19)
3.44
(2.35-4.92)
4.06
(2.67-5.96)
4.55
(2.92-6.74)
3 -hr
0.922
(0.726-1.18)
1.15
(0.902-1.46)
1.54
(1.21-1.97)
1.89
(1.48-2.43)
2.42
(1.84-3.25)
2.85
(2.11-3.86)
3.31
(2.374.58)1
3.80
(2.62-5.40)
4.49
(2.98-6.54)
5.04
(3.25-7.40)
641r1.08
(0.857-1.35)
I 1.32
(1.05-1.66)
1.75
(1.39-2.21)
2.13
(1.68-2.70)
2.71
1 (2.09-3.60) i
3.19
(2.40-4.28)
3.71
(2.69-5.08) J
4.26
(2.97-5.98)
5.04
(3.39-7.25)
5.67
(3.70-8.21)
12 -hr
1.28
(1.03-1.59)
1.52
(1.23-1.89)
1.95
(1.57-2.43)
2.33
(1.87-2.92)
2.91
(2.28-3.82)
3.40
(2.59-4.49)
3.92
(2.88-5.29)
4.47
(3.16-6.19)
5.26
(3.58-7.46)
5.90
(3.89-8.42)
24-hr1.51
(1.23-1.85)
1.75
(1.43-2.15)
2.18
(1.77-2.68)
2.57
(2.08-3.17)
3.15
(2-49.4.07)
3.65
(2.81-4.75)
4.17
(3.11-5.56)
4.75
(3.39-6.47)
5.56
(3.82-7.76)
6.21
(4.15-8.74)
2 -day
1.71
(1.42-2.07)
2.01
(1.66-2.43)
2.51
(2.07-3.06)
2.96
(2.42-3.61)
3.59
(2.86-4.55)
4.11
(3.20-5.26)
I 4.65
' (3.49-6.08)
5.21
(3.76-6.98)
6.00
(4.16-8.23)
6.61
(4.47-9.17)
3 -day
1.89
(1.58-2.28)
2.20
(1.84-2.65)
2.73
(2.27-3.29)
3.18
(2.63-3.86)
3.83
(3.074.80)
4.36
(3.41-5.52)
4.90
(3.71-6.34)
5.47
(3.97-7.25)
6.24
1(4.37-8.49)
6.85
(4.66-9.42)
4Iday
2.05
(1.72-2.45)
2.36
(1.98-2.83)
2.89
(2.42-3.47)
3.35
(2.784.04)
4.01
(3.23-4.99)
4.53
(3.57-5.71)
I 5.08
(3.86-6.53)
5.64
(4.12-7.44)
6.42
(4.51-8.67)
7.03
(4.81-9.60)
7 -day
2.39
(2.03-2.83)
2.73
(2.32-3.24)
3.30 i
(2.79-3.92)
3.78
(3.18-4.51)
4.46
(3.63-5.48)
5.00
(3.97-6.21)
I 5.54
(4.26-7.04)
6.11
(4.50-7.94)
6.87
1(4.88-9.16)
7.47
(5.16-10.1)
1 10 -day
2.68
(2.29-3.16)
3.06
(2.60-3.60)
3.67
(3.12-4.33)
4.18
(3.53-4.95)
4.89
(4.00-5.95)
5.45
[(4.35-6.71)
6.01
6.58
(4.88.8.48)
7.34
1(5.24-9.70)
7.93
(5.51-10.6)
20 -day
3.51
(3.04-4.08) I
3.99
(3.454.63)
4.76
(4.09-5.53)
5.38
(4.61-6.28)
6.22
0(5.14-7.43)
6.86
(5.54-8.30)
7.48
I (5.84-9.24)
8.10
1(6.07-10.2) I
8.90
(6.42-11.5)
9.49
1(6.68-12.5)
30-day
(3.684.85)
4.79
i (4.17-5.51)
5.69
(4.94.6.57)
6.41
(5.53-7.43)
7.36
(6.12-8.70)
8.06
(6.56-9.65)
8.74
(6.87-10.7) I
9.39
(7.08-11.8)
10.2
(7.41-13.1)
lI 10.8
(7.66-14.1)
45 -day
5.12
(4.50-5.85)
5.81
(5.10-6.64)
6.89
(6.03-7.89)
7.73
(6.73-8.89) i
8.82
(7.37-10.3)
9.60
(7.85-11.4)
10.3
(8.17-12.5)
11.0
(8.35-13.6) i
11.8
(8.64-15.0) i
12.4
(8.85-16.1)
60 -day
5.91 I
(5.22-6.71)
6.70
(5.92-7.62)
7.93,_][
(6.97-9.03)
8.87
(7.76-10.1)
10.1
(8.44-11.7)
11.7
(9.27-14.0)
1�
(9.42-15.2)
13.2
(9.65-16.6)
13.7
I (9.83-17.6)
1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS).
Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates
(for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper
bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values,
Please refer to NOAA Atlas 14 document for more information.
Back to Top
https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?iat=40.9724&Ion=-104.4466&data=depth&units=english&series=pds 1/4
Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX F - RATIONAL METHOD RUNOFF CALCULATIONS
1. Drainage Basin Runoff Calculations
November 20, 2019
i
UINTAH
Weld County Rnguteenng & Construction Criteria Table 3.3 Recommended Percentage Imperviousness Values
COht'I) la( I • Table 6-3 Recommended Percentage Imperviousness Values
% Impervtnus
WEIGHTED IMPERVIOUS SURFACE CALCULATIONS
L'ndevdo • ed Areas
Historic Flow
Analysis
2%
Greenbelts,
Agricultural
Off -site flow analysis
(Land Use Not Defined)
Streets
Paved
Gravel
Recycled
Asphalts
Developed Areas
Concrete
Driveways
Sidewalks
Roofs
MISC.
Single -Family
Res.
0.75-2.5 Acres
Parks
Pond Area
Berm s/
Cut/Fill
Slopes/
Landscaping
45%
100%
40%
75%
90%
90%
90%
20%
10%
100%
oe,
11/21/2019
Basil!
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
'total
Area (Ac)
Percent
Imperv.
OS -1
81.35
XI 35
2 00%
OS -2
1091
1091
2 00%
A
1 0 7
_
.
2.10
;2 2%
B
1 29
� iiti
7,34
'�95a�p
0 00
it 00%
0 00
0.00%
0.00
0.00%
0.00
f
0.00%
0.00
0.00%
0.00
0.00%
0.00
0.00%x%
0.00
000%
0.00
0 00%
0 00
0 00%
1 0411
USIX'M Vol I - Section 6.0 Runoff
90 70
Page I
U I NTAH
WEIGHTED RUNOFF COEFFICIENT VERSUS WATERSHED IMPERVIOUSNESS
METHOD AS DETAILED IN URBAN STORM DRAINAGE CRITERIA MANUAL VOL. 1 (COLORADO)
CA=KA+(1.3113- 1.4412+ 1.135i-0.12)for CA > or= 0, otherwise CA=0
G, = (CA + Cc,Y2
CC!) = KC') + 0.85813- 0.78612 4 0.7741 + 0.04)
1 = %imperviousness/100 expressed as a decimal
KA = Correction factor for Type A soils
Kero = Correction factor for Type C and Type D soils
(RO-6)
(RO-7)
Correction Factors, KA & Ka)
Soil Type
Storm Return Period
2 -Year 5 -Year 10-Yr 100 -Year
A
0.00 -0.081 , 0.09 -0 141 + 0.17 -0.25, + 0.32
CorD
0,00 -0.10, + 0.11 -0.181 • 0.21 -0.39, + 0.46
11/21/2019
Basin ID
% lmperv.
i
Soil Type
Correction Factors, KA & KC])
RunoffCoefficients, C
Basin Area
(Ac)
Total Area
Ac
Weighted RunoffCoefficients, C
Suit I vile
5 -Year
10 -Year
100 -Year
2 -Year
I 5 -Year
10 -Year
100 -Year
2 -Year
5 -Year
10 -Year
I
100 -Year
A
0.09
0.1-7
0 32
0.00
O.
0.67
0.22
0 -To
-
OS -1
2.00%
0.02
13
-
-
-
0.03
0.08
0 17
0.36
81 15
81.35
0.03
0.08
0.17
0.36
('or1)
01I
021
045
0.06
016
026
0.51
IoU
I
1
1-
11
.-_
0.11
OS -2
2.00%
0.02
I3
-
0.03
0 08
0 17
U 36
10.91
10.91
0.03
0.08
0.17
0.36
(•orI)
021
0.06
(116
0.26
U5I
11(11)
A
32.22%
0.32
:\
13
C or ti
00G
-
0 08
0.12
I -
0.15
07I
I 0.33
0.14
0.19
0.24
020
0 26
I 0.31
027
0.33
0.39
0TS
(1.48
0.57
000
2.10
0.00
2,10
0.19
0.26
0.33
0 48
B
22.95%
0.23
A
B
C or D
0.07
-
0.09
0.14
I -
U 17
0.26
-
0.37
0.08
0.13
I 0.19
0 15
0 21
027
0.22
0.29
0.36
0.34
0.45
0.56
ii r~(i
2.34
0.00
2.34
0.13
0.21
0.29
U 45
A
0.09
0 17
0.32
0.05
0.05
0.03
3-70
000
U
0.00%
0.00
B
-
-
-
0.05
I
U 10
0.15
I
0.35
(1 OU
0 00
C or p
0.11
0 21
0.46
0.04
0 15
0.25
0.50
0 00
11'•
1
1 11
1,1
..1
1.
-
- -
U
0 0U°,,
0.00
B
-
-
0.02
0 08
0.15
0.35
a 00
0 00
C or D
0.11
0.46
0.04
0.15
025
0 50
0 00
0
0.00%
0 UU
13
1,1'•
-
0 17
-
031
-
0.00
0.02
M
0.70
0.35 I
0.00
0.00
U UU
( urI)
011
021
0.46
0.04
0.50
0.00
1,19
0.00%
0(10
13
-
-
-
0.02
008
0I5
035
0.00
U(RI
('orll
011
0.21
046
004
015
025
050
0-W
:\
009
017
017
000
000
005
020
1.1
0.00%
0 UU
13
-
-
-
U U2
0 08
0 15
0 35
0.00
0.00
('orU
011
U11
0.46
0.U4
015
025
050
000
-
-1
1
1 11
1 1
1 1
1 1'1
0 00%
0.00
13
0 02
0 08
0.15
0.35
0.00
0.00
or D
Oil
0.21
0.46
0.040.25
0.50
0.00
4.1••
1.
1..
1.1'1
1.11
1.4
- 1 1
-- 1 Et
0.00%
0.00
B
0.02
0 08
0.15
0.35
0.00
0.00
C or D
0.11
0.21
0.46
0.04
0 15
0.25
0.50
0.00
iou..,
OW
0.17
0.32
0.00
0.00
0 05
070
0 60
0.00%
0.00
13
0.02
(1 08
0.15
0 35
0 uO
0 (H)
(' or I)
0 I I
U 21
0 7G
0 Opt
U_ 1 S
0.25
U_50
0 00
1001
A
009
017
032
000
000
005
070
0Off
0.00%
0.00
13
-
-
-
0 02
0 08
0.15
0 35
0 00
0 00
Cor1)
011
021
046
004
015
025
0.50
0.00
1(h,-,
1..._
1.11
..1
-..
0.00%
000
13
-
-
-
0.02
008
015
035
000
000
C or 1)
0 11
0 21
0.46
0.04
0 15
0.25
0 50
0 00
10U°.c
l: SI)('M Vol I - Section 6.0 Runoff
Page 2
se.i
uINTAH
r sn,nr INC:r41a 1 ANn n1 rfV I r INn
STANDARD FORM SF -2
TIME OF CONCENTRATION
METHOD AS DETAILED IN URBAN STORM DRAINAGE CRITERIA MANUAL VOL. 1 (COLORADO)
NRCS Conveyance Factors, K
Heavy Meadow 2.50
Tillage/Field 5.00
Short Grass Pasture & Lawns 7.00
Nearly Bare Ground
Grassed Waterway 15.00
10.00 Paved Area & Shallow Gutter
20.00
Is the basin Urban or Non -Urban? Non-UrbaP
i
11/21/2019
Design
Point
Sub -Basin Data
Non -Urban - Eqn 6-3
Initial/Overland Time T(i)
Non -Urban - Eqn 6-4
Travel Time T(t)
Non -Urban
Urbanized Basin
he) e)
Check Flom.
Length
(Overland )
OK
Drainage Basin
Area (Ac)
C(5)
I.cnyth
( ft f
Slope (%)
TO) min
Length
(II)
Slope (%)
CoefY
(K)
Velocity
(fps)
T(t)
(min)
Comp. T(c)
Dotal
Length
Eqn 6-5
T(c)
Final
T(c) (mint.
I
OS -1
81.35
0.08
500
0.4
55.6
6570
0.40
,
00
0.32
346.3
401.9
'
7070
-
156.4
156.4
OS -2
10.91
0.08
500
0.8
44.3
2489
0.8
5.00
0.45
92.8
137.0
2989
54 9
54.9
OK
-1
A
2.10
0.26
234
0.3
34.5
697
0.5
10.0t'
0 71
16 4
51.0
931
21 ,
21.5
OK
B
2.34
0.21
234
0.3
36.5
100
1.0
10 00
I UU
17
38.1
334
15.5
15.50
OK
r,
0.00
300
10
100
1.0
10.00
400
10.0
OK
0.00
300
1 0
100
In
10.00
400
10.0
OK
OK
OK
OK
OK
OK
OK
OK
OK
8
0.00
X00
1.0
100
I.0
10.00
400
10.0
9
0.00
,
100
I0
100
1.0
10.00
400
10.0
I()
0.00
300
I 0
,
100
1.0
10 00
400
10.0
I I
0.00
300
I 0
10t '
r'.
10.00
400
10.0
I.'
0.00
300
1.0
100
I u
10.00
400
10.0
I ;
0.00
100
LO
100
1.0
10 00
400
10.0
! 1
0.00
,00
1 0
100
1 0
10.00
400
In n
I •
0, 00
300
I.0
100
I 0
10 00
I0 ' t i
USDCM Vol 1 - Section 6 (1 Runoff
Page 3
I Ml. W( CRAW. A LAND A4N V t * trio
11/21/2019
STANDARD FORM SF -3
5-YR RUNOFF - RATIONAL METHOD
METHOD AS DETAILED IN URBAN STORM DRAINAGE CRITERIA MANUAL VOL. 1 (COLORADO)
S-Yr Rainfall Depth -Duration -Frequency (l -hr)
1. IN in hr
Design Storm: .5 Year
BASIN INFORMATION
1)112 ECT RUNOF I
TOTAL RUNOFF
Design
Runoff
T(c)
I
( )
T(c)
Sum
1
Q
Point
Drainage Basin
Area (Ac)
Coeff.
(min)
c' x A
on. hr)
(cfs)
(min)
C x A
(in/hr)
(cfs)
RFM1ARKS
I OS -1 81.35 0.08
156.4 6.64 0.60
4.0
OS -2 10.91 0.08
54.9 0.89 1.27
1.1
A 2.10 0.26
21.5 0.54 223
1.2
B 2.34 0.21
15.5 0.50 2.64
1.3
0.00
0.00
s 0.00
', 0.00
0.00
0.00
0.00
0.00
I .) 0.00
I 0.00
USDCM Vol 1 - Section 6.0 Runoff
Page 4
ask
11/21/2019
f fill •11,1t f OIM%• • NANO ,eUN VP Y Wet
STANDARD FORM SF -3
100-YR RUNOFF - RATIONAL METHOD
METHOD AS DETAILED IN URBAN STORM DRAINAGE CRITERIA MANUAL VOL. 1 (COLORADO)
100-Yr katn%a11 Depth -Duration -Frequency (1 -hr)
2.47 of hr
Design Storm: 100 Year
BASIN INFORMATION
DIRECT RUNOFF
TOTAL RUNOFF
>
Runoff
T(c)
1
Q
Sum
I
Q
Point
Drainage Basin
Area (Ac
Coeff
(min)
C x A
(in/hr)
(cfs)
C A
(in/hi)
(cfs)
REMARKS
ir
OS -1 81.35
0.36
156.4
29.47 1.26
37.2
OS -2 10.91
0.36
54.9
3.95 2.65
10.5
I
A 2.10
0.48
21.5
1.00 4.68
4.7
B 2.34
0.45
15.5
1.05 5.52
5.8
,,
0.00
r
0.00
III
0.00
`'
0.00
iu
0.00
I I
0.00
G
'
0.00
id
I;
0.00
U I
0.00
i
0.00
3 ill
11SDCM Vol I - Section 6.0 Runoff
Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX G - CONVEYANCE CALCULATIONS
November 20, 2019
.26
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
PAD DITCH 1 - 5 YEAR
Triangular
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
5482.00
5481.50
5481.00
5480.50
5480 00
5479.50
= 3.00. 3.00
= 1.00
= 5480.00
= 0.25
= 0.020
Known Q
= 1.30
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sgft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth. Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Nov 15 2019
= 0.54
= 1.300
= 0.87
= 1.49
= 3.42
= 0.42
= 3.24
= 0.57
V
ommaile
0
1
2
3
4
5
6
7
8
Depth (ft)
2.00
1.50
1.00
0.50
0.00
-0.50
Reach (ft)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc
PAD DITCH 1 - 100 YEAR
Triangular
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
5482 00
5481.50
5481.00
5480 50
5480.00
5479.50
= 3.00. 3.00
= 1.00
= 5480.00
= 0.25
= 0.020
Known Q
= 4.70
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Thursday Nov 21 2019
= 0.88
= 4.700
= 2.32
= 2.02
= 5.57
= 0.69
= 5.28
= 0.94
v
0
1
2
3
4
5 6
7
8
Depth (ft)
2.00
1.50
1.00
0.50
0.00
-0.50
Reach (ft)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
PAD DITCH 2 - 5 YEAR
Triangular
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
5482.00
5481.50
5481.00
5480.50
5480.00
5479 50
= 3.00. 3.00
= 1.00
= 5480.00
= 0.25
= 0.020
Known Q
= 1.30
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth. Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Nov 15 2019
= 0.54
= 1.300
= 0.87
= 1.49
= 3.42
= 0.42
= 3.24
= 0.57
0
1
2
3
4
5 6
7
8
Depth (ft)
2.00
1.50
1.00
0.50
0.00
-0.50
Reach (ft)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk. Inc
PAD DITCH 1 - 100 YEAR
Triangular
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
5482.00
5481 50
5481.00
5480.50
5480.00
5479.50
= 3.00. 3.00
= 1.00
= 5480.00
= 0.25
= 0.020
Known Q
= 5.80
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth. Yc (ft)
Top Width (ft)
EGL (ft)
Thursday. Nov 21 2019
= 0.95
= 5.800
= 2.71
= 2.14
= 6.01
= 0.75
= 5.70
= 1.02
•
0
1
2
3
4
5 6
7
8
Depth (ft)
2.00
1.50
1.00
0.50
0.00
-0.50
Reach (ft)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc
Off -site Ditch 1
Triangular
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
5483.00
5482.50
5482.00
5481.50
5481.00
5480 50
5480.00
5479.50
= 3.00. 3 00
= 2.00
= 5480.00
= 0.50
= 0.020
Known Q
= 4.00
Section
Highlighted
Depth (ft)
Q (cfs)
Area (sgft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth. Yc (ft)
Top Width (ft)
EGL (ft)
Wednesday, Nov 20 2019
= 0.73
= 4.000
= 1.60
= 2.50
= 4.62
= 0.65
= 4.38
= 0.83
0
2
4
6
8
10 12
14
16
Depth (ft)
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
Reach (ft)
Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk. Inc
Off -site Ditch 2
Triangular
Side Slopes (z:1)
Total Depth (ft)
Invert Elev (ft)
Slope (%)
N -Value
Calculations
Compute by:
Known Q (cfs)
Elev (ft)
5483.00
5482.50
5482.00
5481.50
5481.00
5480.50
5480.00
5479.50
= 3.00. 3.00
= 2.00
= 5480.00
= 0.50
= 0.020
Known 0
= 1.10
Section
Highlighted
Depth (ft)
0 (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth. Yc (ft)
Top Width (ft)
EGL (ft)
Wednesday. Nov 20 2019
= 0.45
= 1.100
= 0.61
= 1.81
= 2.85
= 0.39
= 2.70
= 0.50
0
2
4
6
8
10 12
14
16
Depth (ft)
3.00
2.50
2.00
1.50
1.00
0.50
0.00
-0.50
Reach (ft)
Culvert Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
CULVERT 1
Invert Elev Dn (ft)
Pipe Length (ft)
Slope (%)
Invert Elev Up (ft)
Rise (in)
Shape
Span (in)
No. Barrels
n -Value
Culvert Type
Culvert Entrance
Coeff. K,M,c.Y.k
Embankment
Top Elevation (ft)
Top Width (ft)
Crest Width (ft)
Elev MI
5479 30
5478 30
5477 00
5476 00
647500
5474 00
= 5475.55
= 30.00
= 0.50
= 5475.70
18.0
= Circular
18.0
1
0.013
Circular Corrugate Metal Pipe
Mitered to slope (C)
0.021. 1.33. 0.0463; 0.75. 0.7
= 5478.20
= 18.00
= 10.00
CULVERT 1
Calculations
Qmin (cfs)
Qmax (cfs)
Tailwater Elev (ft)
Highlighted
Qtotal (cfs)
Qpipe (cfs)
Qovertop (cfs)
Veloc Dn (ft/s)
Veloc Up (ft/s)
HGL Dn (ft)
HGL Up (ft)
Hw Elev (ft)
Hw/D (ft)
Flow Regime
0
5
Carcass Curved
10
15
HGL
20
25
Embank
35
Wednesday, Nov 20 2019
= 1.30
= 1.30
= (dc+D)/2
= 1.30
= 1.30
= 0.00
= 1.08
= 3.14
= 5476.51
= 5476.13
= 5476.30
= 0.40
= Inlet Control
rfw Depth it
40
Inlet control
46
50
Reach at
3.30
230
030
470
-170
Fox Creek 33 NW Compressor Site Drainage Report
APPENDIX H - DETENTION POND CALCULATIONS
)vcmber 20, 2019
UINTAH
e N(•40••Y Sao a IAMO WSW • al,
.l
WelCounty F.nguwenng .4 C-anurwcnon (menu Table 5-3 Recommended Percentage Imperviousness Mahn
111)1•111 144. 1 - fable 6.3 Recommended Percentage lmpervrowne s Falwes
6/6 lmt)Cry iou s
WEIGHTED IMPERVIOUS SURFACE CALCULATIONS
Undeveloped Areas
historic Flow
Analysis
70,
Greenbelts,
Agricultural
2%
Off -site flow analysis
(Land Use Not Defined)
45%
Streets
Paved
100%
Recycled
Asphalts
Developed Areas
Concrete
Driveways
Sidewalks
Roofs
MISC.
Single -Family
Res.
0.75-2.5 Acres
Parks
Pond Area
Berms
( ul/F ill
Slopes
I.andscapint;
11/21/2019
Basin
Area (Ac)
Area (Ac)
Area (Ac)
r
e
Area (Ac)
Area (Ac)
Area (Ac)
Area (AO
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
Area (Ac)
loyal
.kr'ea (Ac)
Percent
lm pen.
Developed Area
2 96
0 24
1 48
4 68
31 06%
I listonc Area
4 OK
4 68
2 00%
0.00
0 00%
0.00
0 00%
0.00
0.00%
0.00
0 00%
000
000%
0.00
0 00%
0 00
0 00%
000
0 00%
0.00
0 00%
0.00
000%
000
000%
0 00
0.0(W/6
oral
') )t,
USDCM Vol I - Section 6.0 Runoff
Page I
DETENTION VOLUME BY THE MODIFIED FAA METHOD
Project: FOX CREEK 33 NW COMPRESSOR SITE
Basin I0: DETENTION POND
(For catchments less than 160 acres only. For larger catchments, use hydrograph routing method)
(NOTE for catchments larger than 90 acres, CUHP hydrograph and routing are recommended)
Determination of MINOR Detention Volume Using Modified FAA Method
Determination of MAJOR Detention Volume Using Modified FAA Method
Design Information (Input):
I, _
A =
Type =
T =
Tc =
q =
P, =
C. =
C; =
C. =
25. 50. or 100,
Design Information (input);
I, =
A =
Type =
T =
Tc =
et=
P, =
C. a
C: •
CI =
31 06
percent
acres
25. 50. or 1001
Catchment Drainage Imperviousness
Catchment Drainage Area
Predevelopment NRCS Sod Group
Return Period for Detention Coned
Time of Concentration of Watershed
Allowable Unit Release Rate
One -hour Precipitation
Design Rainfall IDF Formula i = C,' P,l(Cr+T,)•C,
Coefficient One
Coefficient Two
Coefficient Three
. ..
- _ent
Oatchment Drainage Imperviousness
Catchment Drainage Area
Predevelopment NRCS Sal Group
Return Period for Detention Control
rime of Concentration of Watershed
Allowable Unit Release Rate
One -hour Precipitation
Design Ratndtl IDF Formula I a C,' P,l(C,+TJ•C)
Coefficient One
Coefficient Two
Coefficient Three
e 686:
ages
A B. C, or D
years (2. 5. 10.
minutes
cfslacre
r+ctnes
4.680
B
B
A, 8. C. or 0
years (2. 5 10
10
100
20
20
minutes
cfslacre
inches
0 49
0.49
n 43
2 47
2810
28 50
10
10
0 789
0789
Determination of Average Outflow from the Basin (Calculated).
Determination of Average Outflow from the Basin (Calculated):
Runoff Coefficient
Inflow Pea
Allowable Peak
C =
Runoff Op -in =
Outflow Rate Op -out =
Mod. FAA Minor Storage Volume a
Mod. FAA Minor Storage Volume -
<- Enter Rainfall Duration Incremental Increase Value
0.32
cfs
cfs
Runoff Coefficient C =
inflow Peak Runoff Op in =
Allowable Peak Outflow Rate Op -out =
Mod. FAA Major Storage Volume a
Mod. FAA Major Storage Volume a
0.47
cis
do
cubic feet
atte-ft
4 17
10.58
2.30
2.30
2.568 cubic test
14,513
0.069
acts It
for 5•Minutes)
0.333
5
Here (e ➢ 5
Rainfall
Duration
minutes
(input)
Rainfall
Intensity
inches! hr
soutput)
Inflow
Volume
acre-feet
(output)
Adjustment
Factor
gym"
(qutput)
Average
Outflow
els
(oumutl
Outflow
Volume
acre-feet
(output)
Storage
Volume
acre-feet
(output)
Rainfall
Duration
minutes
(inputl
Rainfall
Intensity
inches/hr
(output)
Inflow
Volume
acre-feet
(output)
Adjustment
Factor
'm'
(output)
Average
Outflow
cfs
(output)
Outflow Storage
volume volume
acre-feet acre-feet
'. output ' :output)
0
000 0-000
000
000
0 000
0 000
0
000
0.000
000
0.00
0 000
0 000
5
4.81 0:050
1.00
230
0.016
0.034
3
8.31
0 126
1.00
2.30
0.018
0.110
10
383
0079
100
230
0 032
0 047
10
882
0.201
100
2.30
0032
0189
15
322
0.099
100
2.30
0.047
0.0633
0 052
15
5 55
0.252
1.00
2.30
0047
0.205
20
2 78
0 115
-
100
230
0.052
20
411
0.291
1.00
2.30
0.063
0.228
25
247
0127
090
207
0.071
0056
25
426
0.323
0.90
2 07
0071
0.251
30
222
0.137
0.83
1.91
0 079
0.058
30
3.83
0.348
0.83
1.91
0.079
0.289
35
202
0 146
0.79
/ 81
1.067
0 059
35
3 49
0.370
079
1.81
0 087
0263
40
106
0 154
0 75
172
0 095
0 059
40
3 21
0390
1
075
172
0095
0295
45
173
0.180
0.72
106
0103
0057
45
2.98
0406
0.72
1.66
0.103
0.304
50
1 81 0186
0 70
1 81
0 111
0 055
50
2 70
0422
070
1 61
0111
0 311
55 _
_ t 51
0 172
068
t 57
0119
0 053
86
2 61
0.435
088
1.57
0.119
0 31 7
60
1 43
0 177
0:87
153
0.127
0 050
69
246
0.448
067
1.53
0 127
0 321
85
135 0 161
0.65
150
0.135
0 047
65
2 33
0.460
065
150
0 135
0 325
70.
1.28
0.185
0.84
148
0 142
0 043
70
222
0.470
0:64
1.48
0.142
0 328_
75
1.22 -
0189
0.83
146
0150
0.039
75
211
0.481
0.83
1.48
0150
0330
80
1 17 0 193
063
144
0 158
0035
80
202
0.490
083
144
0156
0 332
85
112 0197
0.62
142.
0166
0:030
8S
194
0.499
062
1.42
0188
0333
90
108 0 200
0 61
140
0174
0 026
90
186
0.507
061
1 40
0174
0 333_
95
1.04 0 203
0.61
139
0 162
0.021
95
/ 79
0.515
0 61
139
0182
0 333
100
100 0206.
080
138
0190
0016
100
1 73
0 523
0.60
1.38
0 190
0 333
105
096 0209
0.00
1 37
0196
0 011
105
1 87
0.530
060
1 37
0198
0 332
110
0.93
0.212
059
136
0206
0.006
110
1 81
0 537
059
1.36
0206
0 331
115
090
0 214
0 59
135
0.214
0 001
115.
156
0 543
0.59
135
0214
0.330
120
088 0 217
056
134
0 222
-0 005
120
1 51
0 550
058
134
0.222
0 326
125
0.85
0.219
0:58
133
0.229
-0.010
125
147
0.558
058
1.33
0.229
0 237
0.328
130
0 83
0221
058
133
0.237
4.018
130
1 43
0 562
0.56
1.33
0.324
135
080
0224
057
132
0 245
-0 022
135
t 39
0.567
0.57
1.32
0 245
0 322
140
078
0.226
0.57
1 31
0 253
-0.027
140
1 35
0.573
057
1.31
0.253
0 320
145
076
0 228
057
1 31
0 261
-0 033 •
145
1 32
0 578
057
1.31
0251
0.317
150
0 74
0.230
0.57
130
0.269
-0039
150
1.28
0 583
0.57
1.30
0.269
0.314
155
073
0232
0.56
130
0 277
-0 045
1555
1 25
0 588
0.56
130
0 277
0.311
160
0 71 r
0.234
0.56
129
0285
-0 051
180
122
0 593
0 56
129
0 265
0308
165
0.69
0 236
0.56
129
0 293
-0 057
165
120
0 598
056
1.29
0.2930.305_
170
088
0 238
0.56
1 28
0301
-0.063
170
1 17
0
0.56
128
0 301
_803 0302
175
086
0239
0.56
126
0 308
-0.069
175
1 14
0607
056
1.28
0309
0 290
160
_ a85 .
0241
050
1 25.
0 317
-0.076 _
1_60
1 12
0 611
050
128
0317
0.295
185
064 1
0243
0 55
127
0 324
-0 082
185
1 10
0 616
055
127
0 324
0.291
190
062
0 244
0 55
127
0 332
-0.088
190
1.08
0.6220
0.55
1.27
0.332
0.267
195
081 J
0.248
0 55
1 27
0 340
-0 094 a
195
1 06
0.624
0 55
1.27
0340
0 283
200
060
0.247
0 55
126
0.348
-0 101
200
1.04
0.628
0 55
128
0348
0.290
205
0.59
_0.249
0 55
128
0 356
-0.107
205
102
0632
0 55
1.26
0356
0275
210
058
0.250
0 55
1.26
0.364
-0.114
210
100
0.835
0 55
126
0 364
0 271
215
057
0252
055
128
0 372
-0 120
215
096
0.639
0 55
128
0372
0 267
220
058
0.253
0.55
125
0.380
-0.127
220
0.96
0.643
0 55
1.25
0.380
0263
225
055
0 255
054
125
0 388
-0.133
22$
r 0.95
0 646
054
1 25
0 368
0258
230
054 0.256
0 54
125
0 396
-0140
230
0.93
0 690
054
125
O 396
0 254
235
053
0.257
0.54
1.25
0404
-0.148
235
0 92
0.653
0.54
125
0.404
0.250
240
052 I
0.259
054
124
0 411
-0 153
240
0.90
0 658
054
1 24
0 411
0 245
745
0.51 T 0.280.
0.54
1 24
0 419
-0 159
245
0.89
0 660
054
1 24
0.419
0 240
250
0 51
0.281
054
1 24
0.427
-0 166
250
0.86
0 683
054
1 24
0.427
0 236
%55
050
0263
0.54
124
0435
-0173
255
086
0608
054
124
0435
0231
260
265
0.49
048
0 264
0.54
1 24
0 443
-0 179
280
0.85
0.069
054
1.24
0.443
0228
0.265
054
1 24
0 451
-0 186
265
084
0.872
0 544
1.24
0.451
0221
270
048 0 206
054
123
0 459
-0 193
270
083
0 875
054
123
0 459
0 216
275
0.47 I
0.261 -
0.54
123
0 467
-0 199
275:
0 e
0678
054
123
0 487
0 211
280
0.46 0269
0.54
123
0 475
-0.206
280
080
0 681
054
1.23
0 475
0206
285
046
0270
054
123
0 483
-0 213
24'5
079
0684
0 54
t 23
0463
0201
290
0.45
0.271
0 53
1 23
0 491
0 220
290
0.78
0.687
053
1.23
0 491
0 198
295
0-45
0 272
0 53
1 23
0 499
-0 227
295
077
0690
053
1 23
0 499
0 191
300
044
0 273
0 53
1 23
0 506
.0 233
"300
078
0692
05-3 1 23
0 508
0.188
Mod. FAA Minor Storage Volume (cubic It) a 2,888 Mod. FAA Major Storage Volume (cubic It) a
Mod. FAA Minor Storage Volume (acre -ft) = 0.0589 Mod. FAA Major Storage Volume (acre -ft) -
UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2 34, Released November 2013
UD Detention. v2 34 (2). Modd:ed AAA
14,513
0.3332
11121/2019 3 52 PM
DETENTION VOLUME BY THE MODIFIED FAA METHOD
Project: FOX CREEK 33 NW COMPRESSOR SITE
Basin ID: DETENTION POND
I
Inflow and Outflow Volumes vs. Rainfall Duration
Volume (acre-feet)
08
07
06
0.5
04
0.3
02
0.1
••••••••••••••••••••••••
•
•
•
•
_
•
000000060000000
00000,,
0 4.
0
50
100
150 200
Duration (Minutes)
250
300
Seem Nome Mow Volume i•n.enof Steno Outflow Vohs O Maw !lane Uttar Volume Steam Storm labs VWe ef4yar Storm OWfbw Volta • NSW Storm Wage Vodu mm
350
UDFCD DETENTION BASIN VOLUME ESTIMATING WORKBOOK Version 2 34, Released November2013
UD-Detention v2 34 (2). Modified FAA
11121/2019, 3 52 PM
STAGE -STORAGE SIZING FOR DETENTION BASINS
Project: FOX CREEK 33 NW COMPRESSOR SITE
Basin ID: DETENTION POND
Design Information (Input):
Width of Basin Bottom, W =
Length of Basin Bottom, L =
Dam Side -slope (H V). 4 =
Stage -Storage Relationship:
Dam
W•
Sti Skp Z
4 _
ft
ft/ft
4 -
Silt Sklar I
r L -s
Check Basin Shape
Right Triangle OR.
Isosceles Triangle OR
Rectangle OR.
Circle / Ellipse OR.
Irregular (Use Overide values in cells G32 G52)
Storage Requirement from Sheet' Modified FAA':
Storage Requirement from Sheet 'Hydrograph':
Storage Requirement from Sheet'Full-Spectrum':
MINOR
0.06
MAJOR
0.33 acre -ft.
acre -ft.
acre -ft
Labels
for WQCV, Minor.
& Major Storage
Stages
(input)
Water
Surface
Elevation
ft
'i:'put 1
Side
Slope
(H -V)
ft/ft
Below El
Basin
Width at
Stage
ft
(output(
Basin
Length at
Stage
ft
(output)
Surface
Area at
Stage
ft2
(output)
Surface
Area at
Stage
ft2 User
Overide
Volume
Below
Stage
ft3
(output)
Surface
Area at
Stage
acres
(output)
Volume
Below
Stage
acre -ft
(output)
Target Volumes
for WQCV. Minor,
8 Major Storage
Volumes
(for goal seek)
5471.90
(input)
0
0
0.000
0.000
5472 00
0.00
0.00
253
13
0.006
0.000
547210
0.00
0.00
1.012
76
0.023
0.002
5472.20
0.00
0.00
2.277
240
0.052
0.006
5472 30
0.00
0.00
3.803
544
0.087
0.012
5472,40
0.00
0.00
5.097
989
0.117
0.023
5472 50
0.00
0.00
5.912
1,540
0.136
0.035
5472.60
0.00
0.00
6.248
2,148
0.143
0.049
5472 70
0.00
0.00
6.346
0.146
0.064
2,777
5472.80
0.00
0.00
6.444
3,417
0.148
0.078
WQCV
5472 90
0.00
0.00
6,542
4,066
0.150
0.093
5473.00
0.00
0.00
6.641
4,725
0.152
0.108
5473 10
0.00
0.00
6.741
5,394
0.155
0.124
5473 20
0.00
0.00
6,841
6,074
0.157
0.139
5473 30
0.00
0.00
6.942
6,763
0.159
0.155
5473 40
0.00
0.00
7.043
7,462
0.162
0.171
5473 50
0.00
0.00
7.145
8,171
0.164
0.188
5473 60
0.00
0.00
7.248
8,891
0.166
0.204
5473.70
0.00
0.00
7.351
9,621
0.169
0.221
5473 80
0.00
0.00
7.455
10,361
0.171
0.238
547390
0.00
0.00
7.559
_
11,112
0.174
0.255
5474 00
0.00
0.00
7,663
11,873
0.176
0.273
5474.10
0.00
0.00
7.769
12,645
0.178
0.290
547420
0.00
0.00
7,875
13,427
0.181
0.308
5474.30
0.00
0.00
7.981
14,220
0.183
0.326
5474 40
0.00
0.00
8.088
15.023
0.186
0.345
100-YR WSEL
5474.50
0.00
0.00
8.196
15,837
0.188
0.364
SPILLWAY
5474 60
0.00
0.00
8,304
16,662
0.191
0.383
5474.70
0.00
0.00
8.413
17,498
0.193
0.402
5474 80
0.00
0.00
8.522
18.345
0.196
0.421
5474.90
0.00
0.00
8.632
19,203
0.198
0.441
5475.00
0.00
0.00
8.742
20,071
0.201
0.461
547510
0.00
0.00
8.853
20,951
0.203
0.481
5475.20
0.00
0.00
8.965
21,842
0206
0.501
5475 30
0.00
0.00
9,077
22,744
0.208
0.522
5475.40
0.00
0.00
9.189
23,657
0211
0.543
5475 50
0.00
0.00
9.303
24,582
0.214
0.564
5475 60
0.00
0.00
9.417
25,518
0.216
0.586
#N/A
SN/A
#N/A
*NIA
#N/A
IN/A
*N/A
*WA
*NIA
*N/A
*NIA
*NIA
UD-Detention_v2.34 (2), Basin
11/21/2019, 3:52 PM
STAGE -STORAGE SIZING FOR DETENTION BASINS
Project:
Basin ID:
STAGE -STORAGE CURVE FOR THE POND
5475.90
5475.40
5474.90
5474.40
5473.90
5473.40
5472.90
5472 40
547190 -
0.00
0.10 0.20 0.30 0.40 0.50 0.60 0.70
Storage (acre-feet)
UD-Detention_v2.34 (2), Basin
11/21/2019, 3:52 PM
STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET
Project, FOX CREEK 33 NW COMPRESSOR SITE
Basin ID: DETENTION POND
y4QCV Desian Volume Ilnoutl�
Catchment Imperviousness i.=
Catchment Area A =
Depth at WQCV outlet above lowest perforation. H =
Vertical distance between rows h =
Number of rows, NL =
Orifice discharge coefficient C„ =
Slope of Basin Trickle Channel S
Time to Drain the Pond =
Watershed Dosran Information (Input)-
; 'ercent Soil Type A =
Percent Soil Type B =
Percent Sal Type C/D =
Outlet Design Information (Output):
3
31 1
4 68
2
800
3 00
0 67
0 004
40
0
100
0
percent
acres
feet
inches
ft f ft
hours
Diameter of holes. O =
Number of holes per row, N =
Height of Not. H
Width of slot W
0 714
1
28
Water Quality Capture Volume. WOCV = _
Water Quality Capture Volume (WQCV) =
Design Volume (WQCV 1 12 • Ares' 1.2) Vol a
Outlet area per row. A0 =
Total opening area at each row based on user -input above, A0 =
Total opening area at each row based on user -input above. A0
inches
inches
inches
0 149 watershed inches
0058 acre-feet
0.070 acre-feet
0 40 square inches
0 40 square inches
0 003 square feet
0
0
O
0
O
O
O
U
0
a
O 0
O r)
O 0
O 0 0 0
D 0
O O
o O 0
O 0
O 0
o a
•
O Q 0
o a
Perforated
Plate
Examples
4
Central Elevations of Rows of Holes in feet
E
Flow
Rawl Row 2 Row 3 Row 4 Row 5 Row 6 Row 7 Row 8 Row 9 Row 10 Row 11 Row 12 Row Li Row 14 Row 15 Row 18 Row 17 Row 18 Row 19 Row 20 Row 21 Row 22 Row 23 Row 23
MANI 517257 [547323 1 T 11 1 1 L1 T �_ L
—1 —
Collation Capacity for Each Row of Hoke in cfs
5471 90
0.0000
0.0000
0 0000
!
0.00
5472 00
0.0047
0 0000
0.0000
0.00
5472 10
0.0067
0 0000
0 0000
0.01
5472 20
0.0082
0.0000
0.0000
0.01
5472 30
0.0094
0 0000
0.0000
0.01
5472 40
0.0106
0.0000
0.0000
0.01
5472 50
0.0118
0 0000
0 0000
0.01
547260
0 0125
0 0026
0 0000
0.02
5472 70
0.0134
0.0054
0 0000
0.02
5472 80
0.0142
0 0072
0.0000
0.02
5472 90
0.0149
0 0086
0 0000
0.02
547300
0.0157
0 0098
0.0000
0.03
5473.10
0 0184
0 0109
0 0000
0.03
5473.20
0.0170
0 0119
0 0000
-
0.03
5473 30
0.0177
0.0128
0 0040
0.03
5473 40
0.0183
0 0136
0 0062
0.04
5473 50
0 0189
0.0144
0.0078
0.04
5473 60
0.0195
0 0152
0.0091
0.04
5473 70
0.0200
0 0159
0 0102
0.05
5473 80
0.0206
0 0168
0 0113
0.05
547390
0.0211
0 0172
0.0122
0.05
5474.00
0.0216
0.0179
0.0131
0.05
5474 10
0 0222
0 0185
0 0139
0.05
5474 20
0.0220
0 0191
0 0147
0.06
5474 30
0 0231
0 0190
0 0154
0.06
5474 40
0 0236
0 0202
0 0182
0.06
5474 50
0.0241
0 0207
0.0188
_
-
-
-
-
0.06
5474 60
00245
0 0213
0 0175
0.06
5474 70 ,
0 0250
0 0218
0.0181
0.06
5474 80 i
0 0254
0 0223
0.0167
0.07
5474 90 i
0 0259
0.0228
0.0193
0.07
5475 00
0 0263
0 0233
0.0199
0.07
5475 10
0.0287
0 0238
0.0204
0.07
5475 20
0.0271
0.0242
0.0210
0.07
5475.30
0.0275
0.0247
0 0215
0.07
5475 40
00279
0 0251
0.0220
0,Qe
5475 50
0 0283
0.0256
0.0225
0.Q$
5475.60
0.0287
0.0280
0.0230
-
-
-
9,08_
INA
Me
Me
_
A
IWA
*4/A
Mf/A
*
*WA
N11
*9*
/WA
IN/A
M47A
.—
IN/A
INA
py'A
INIA
/MA
IWA
MIA
8WA
IWA
tNI/A
IWA
i
r
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*4/A
Override Ovemde Override Override
Area Area Area Area
Row 1 Row 2 Row 3 Row 4
Override
Area
Row 5
Overnde
Area
Row 6
Override
Area
Row 7
Override
Area
Row 8
Override
Area
Row 9
Override
Area
Row 10
Override
Area
Row 11
Override
Area
Row 12
Override
Area
Row 13
Override
Area
Row 14
Override
Area
Row 15
Override
Area
Row 16
Override
Area
Row 17
Override Override
Area Area
Row 18 Row 19
Override
Area
Row 20
Override Override
Area Area
Row 21 Row 22
Override
Area
Row 23
Overnde
Area
Row 24
UD-Detention_v7 34 (7). WQCV
1121/2019, 3.52 PM
i
STAGE -DISCHARGE SIZING OF THE WATER QUALITY CAPTURE VOLUME (WQCV) OUTLET
i
Pro►ect: FOX CREEK 33 NW COMPRESSOR SITE
Basin ID: DETENTION POND
Stage (feet, elev.)
5476 00
547500
5474 00
5473.00
5472 00
5471 00
STAGE -DISCHARGE CURVE FOR THE WQCV OUTLET STRUCTURE
5470.00
0.00
0 01 0.02 0.03 0.04 0.05
Discharge (cfs)
0,06 0.07
0.08 009
UD-Oetennon_v2 34 (2), WQCV
11(21/2019, 352 PM
RESTRICTOR PLATE SIZING FOR CIRCULAR VERTICAL ORIFICES
Project: FOX CREEK 33 NW COMPRESSOR SITE
Basin ID: DETENTION POND
0 o
To _
X
O O
Yo
Sizing the Restrictor Plate for Circular Vertical Orifices or Pipes (Input)
Water Surface Elevation at Design Depth
Pipe/Vertical Orifice Entrance Invert Elevation
Required Peak Flow through Orifice at Design Depth
PipeNertical Orifice Diameter (inches)
Orifice Coefficient
Full -flow Capacity (Calculated)
Full -flow area
Half Central Angle in Radians
Full -flow capacity
Calculation of Orifice Flow Condition
Half Central Angle (0<Theta<3.1416)
Flow area
Top width of Orifice (inches)
Height from Invert of Orifice to Bottom of Plate (feet)
Elevation of Bottom of Plate
Resultant Peak Flow Through Orifice at Design Depth
Width of Equivalent Rectangular Vertical Orifice
Centroid Elevation of Equivalent Rectangular Vertical Orifice
O O
O O
Elev: WS =
Elev: Invert =
Q=
Dia =
Co =
Af =
Theta =
Qf =
Percent of Design Flow =
Theta =
Ao_
To =
Yo=
Elev Plate Bottom Edge =
O0=
#1 Vertical
Orifice
#2 Vertical
Orifice
5,474.60
5,471.90
2.30
8.0
0.55
0.35
3.14
2.4
103%
2.58
0.34
4.24
0.62
5,472.52
2.3
feet
feet
cfs
inches
sgft
rad
cfs
rad
sq ft
inches
feet
feet
cfs
Equivalent Width = 0.55 I feet
Equiv. Centroid El. = 5,472.21 feet
UD-Detention_v2.34 (2), Restrictor Plate
11/21/2019, 3:52 PM
STAGE -DISCHARGE SIZING OF THE SPILLWAY
Project: FOX CREEK 33 NW COMPRESSOR SITE
Basin ID: DETENTION POND
Design Information (input):
Bottom Length of Weir
Angle of Side Slope Weir
Elev for Weir Crest
Coef for Rectangular Weir
Coef for Trapezoidal Weir
Calculation of Spillway Capacity (output):
SPILLWAY
L=
Angle =
EL Crest =
C
C. _
9.00
68 20
5,474 60
3.00
3.00
Water
Surface
Elevation
ft
(linked)
Rect
Weir
Flowrate
cfs
(output)
Triangle
Weir
Flowrate
cfs
(output)
Total
Spillway
Release
cfs
(output)
Total
Pond
Release
cfs
(output)
5471.90
0 00
0.00
0.00
0.00
5472.00
0 00
0 00
0.00
0 00
5472.10
0.00
000
000
000
5472.20
0.00
0 00
0 00
0.00
5472.30
0 00
0.00
0.00
0.00
5472.40
0 00
0 00
0 00
0 00
5472.50
0 00
0.00
0 00
0 00
5472.60
0 00
0 00
0 00
0 00
5472.70
0.00
0.00
0 00
0.00
5472.80
0 00
0.00
0 00
0 00
5472.90
0 00
0 00
0 00
0 00
5473.00
000
000
000
000
5473.10
000
000
000
000
5473.20
0.00
0.00
0 00
0 00
547330
000
000
000
000
5473.40
0 00
0.00
0 00
0.00
5473.50
0 00
0.00
0 00
0 00
5473.60
0.00
0.00
0.00
0 00
5473.70
0 00
0.00
0 00
0 00
5473.80
0.00
0.00
0 00
0.00
5473.90
0 00
0 00
0 00
0 00
5474.00
0.00
0.00
0 00
0 00
5474.10
0 00
0 00
0 00
0 00
5474.20
000
000
000
000
5474.30
0 00
0 00
0 00
0.00
5474.40
0.00
0.00
0 00
0.00
5474.50
0.00
0.00
0 00
0 00
5474.60
000
000
000
000
5474.70
0 85
0.02
0 88
0.88
5474.80
2 41
0 13
2 55
2 55
5474.90
4 44
0.37
4 81
4 81
5475.00
6 83
0 76
7 59
7 59
5475.10
9.55
1.33
10.87
10.87
5475.20
12 55
2.09
14 64
14 64
5475.30
15 81
3.07
18.89
18.89
5475.40
19 32
4.29
23 61
23 61
5475.50
23 05
5.76
28.82
28 82
5475 60
27 00
7 50
34 50
34 50
#N/A
#NiA
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N'A
#N,A
#N,A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#N/A
#NIA
#N/A
#N A
#N.A
#N/A
MIA
#N/A
#N/A
#N/A
feet
degrees
feet
100 -YEAR 10 58 CFS
UD-Detention_v2.34 (2), Spillway 11/21/2019. 3 52 PM
STAGE -DISCHARGE SIZING OF THE SPILLWAY
Project: FOX CREEK 33 NW COMPRESSOR SITE
Basin ID: DETENTION POND
I
STAGE -STORAGE -DISCHARGE CURVES FOR THE POND
0
5476.3369
5475 7823
5475.2277
a)
w 5474.6731
a)
a)
a)
ccri v 5474.1185
vs
5473.5638
5473.0092
5472.4546
Storage (Acre -Feet)
0.1 0 2 0 3 0.4 0 5 0.6 0.7
F-
5471.9
0
5 10 15 20 25
Pond Discharge (cfs)
30 35 40
4Ips, TOTAL O'5CHAW3f
SAiLLVAYDSCRARGE
PCNOSTORAGE
1
UD-Detention_v2.34 (2), Spillway
11/21/2019, 3:52 PM
HighPoint
RESOURCES
EMERGENCY RESPONSE PLAN
FOX CREEK 33 NW COMPRESSOR STATION
LOCATED IN THE NW 1/4 NW 1/4 OF SECTION 33, TOWNSHIP 12
NORTH, RANGE 63 WEST OF THE 6th P.M.
COUNTY OF WELD, STATE OF COLORADO
DRAFT REVISION - NOVEMBER 20191126
HighPoint
=RESOURCES=
1.0 INTRODUCTION 1
2.0 FACILITY -SPECIFIC INFORMATION 1
3.0 EMERGENCY COMMUNICATIONS PROCEDURES 2
3.1 HPR INCIDENT LEVELS 2
3.2 HPR INCIDENT MANAGEMENT CHAIN OF COMMAND 3
3.3 COMMUNICATION TECHNIQUES 5
3.4 MEDIA COMMUNICATIONS 6
3.5 NOTIFICATION OF EMPLOYEE'S FAMILY 6
4.0 ON -SCENE INCIDENT COMMAND 6
5.0 PRESERVATION OF EVIDENCE AND SITE SECURITY 6
6.0 EMERGENCY RESPONSE SCENARIOS 7
6.1 RESPONSE TO AN INJURY OR ILLNESS 7
6.2 RESPONDING TO A LEAK OR SPILL (Coordinate with SPCC Plan as
applicable)
6.3 RESPONDING TO A FIRE
6.4 RESPONDING TO A H2S RELEASE
6.5 RESPONDING TO INCLEMENT WEATHER
6.6 RESPONDING TO A BOMB THREAT OR TERRORIST ACTIVITY 13
6.7 RESPONDING TO UNAUTHORIZED VISITORS / PROTESTORS 15
FIGURE
FIGURE 1
APPENDICES
APPENDIX A
APPENDIX B
APPENDIX C
APPENDIX D
APPENDIX E
APPENDIX F
8
9
9
12
FOX CREEK 33 NW COMPRESSOR STATION PLOT MAP
HPR CONTACT INFORMATION
EMERGENCY SERVICES CONTACT INFORMATION
EMERGENCY MEDICAL FACILITY DIRECTIONS
AGENCY CONTACT INFORMATION
HELICOPTER LANDING ZONE
PLAN REVIEW LOG
ii
HighPoint
RESOURCES -
1.0 INTRODUCTION
Serious incidents, unless properly and effectively managed, can result in loss of life and
damage to public or private property. Serious incidents can also generate complex technical,
legal, and public relations problems. It cannot be overemphasized that the best way to handle
emergency situations is to prevent their occurrence. However, when incidents do occur, prompt
and proper response can mitigate damage and minimize business interruption and financial
impact. This Emergency Response Plan (ERP) is designed to help HighPoint Operating
Corporation (HPR) field personnel respond quickly and effectively to the problems presented by
serious incidents.
Within this ERP you will find guidance for responding to emergency incidents and descriptions
of the duties that must be accomplished when a serious incident occurs. This ERP provides
field personnel with tools and procedures for handling such incidents effectively.
This ERP is for the Fox Creek 33 NW Compressor Station, and was prepared:
1. To serve as the basis for an organized action plan in dealing with emergencies and spills
of all magnitudes;
2. To spell out responsibilities and priorities in countering an emergency situation or major
spill;
3. To provide information on the means for handling serious incidents and provide the tools
to properly document incidents and incident response; and
4. To tabulate the contact information for the personnel and agencies that must be notified in
order to promptly and properly respond to an emergency incident.
Prompt action is mandatory. For this reason, the content of this ERP must be understood and
readily available to all HPR field personnel. All involved employees should be informed to take
quick action to protect life and property and to immediately report the incident.
The ERP will require modification from time to time, as field personnel change, as technologies
advance, and as experience indicates improvements. The ERP is to be reviewed annually by
Environment, Health, and Safety (EH&S) and operations staff to ensure that it is up to date.
This ERP is not intended to replace existing Spill Prevention, Control, and Countermeasures
(SPCC) plans or other required plans, but rather its purpose is to be a supplement providing
general guidelines for emergency situations.
2.0 FACILITY -SPECIFIC INFORMATION
This ERP has been developed for the HPR Fox Creek 33 NW LOCATED IN THE NW 1/4 SW
1/4 OF SECTION 26, TOWNSHIP 12 NORTH, and RANGE 63 WEST OF THE 6th P.M.
COUNTY OF WELD, STATE OF COLORADO
The HPR Fox Creek 33 NW Compressor Station consists of separation equipment, and
compressor buildings used for treatment and compression of gas for sale.
HighPoint
RESOURCES -
The entire facility is equipped with an Emergency Shut -Down (ESD) system that will incorporate
both manual and automatic compressor and gas supply shut -downs. The ESD system will
incorporate gas detection equipment in the compressor buildings to actuate automatic ESD of
the facility.
All electrical equipment installed will comply with appropriate hazard class locations or accepted
industry practice in order to minimize fire and explosion potential associated with this
equipment. Equipment will have guard posts installed when the potential for traffic impact with
the equipment is likely. Pressure relief valves will be in place on the compressors, the slug
catcher, the fuel gas scrubber, and the filter separators. These will minimize the potential for
hazardous pressure build-up and explosion.
The entire site will be fenced and will be a no smoking area. All appropriate hazard warning
signage will be in place on the site entrance and applicable equipment. 10-, 20-, and 30 -pound
rated fire extinguishers will be located in key locations throughout the site.
3.0 EMERGENCY COMMUNICATIONS PROCEDURES
Prompt reporting of EHS incidents is critical to ensure HPR Management and EHS staff have
been informed of an incident so they can provide guidance and resources as necessary.
Prompt reporting is also necessary to ensure that all appropriate regulatory agency notifications
are made in a timely fashion.
3.1 HPR INCIDENT LEVELS
HPR has created criteria to classify incidents by level of severity so appropriate and uniform
notifications and response actions can be taken. The criteria presented below are to be utilized
to determine if an incident is a Level 1, 2, or 3 incident. The level of the incident will then
determine what notifications are necessary and by what means incidents are to be
communicated within the HPR organization.
Level 1 - Lowest Level:
1.
An incident without fire, recordable injuries, public involvement, or adverse media
involvement, typically reported as a near miss or a first aid incident.
2.
Any reportable spill that does not reach water or a drainage feature.*
3.
Minor unplanned and uncontrolled gas or vapor release.
4.
Vehicle accident without injury and/or damage less than $5,000.
5.
Property damage less than $5,000.
*Note: Any spill of any level should be reported to EH&S.
Level 2 - Intermediate Level
1.
Incidents involving recordable or serious injury to employees, contractors, or the public.
2.
Gas or vapor release requiring employee or contractor evacuation.
3.
A fire that can be managed with internal resources immediately controlled and
extinguished.
4.
Any spill to water.
5.
Vehicle accident with injury and/or damage greater than $5,000 but less than $10,000.
HighPoint
RESOURCES -
6. Property damage greater than $5,000 but less than $50,000.
7. Significant Notices of Violation, fines, penalties, administrative orders, etc. received from
any government agency.
Level 3 - Highest Level
1.
Incidents involving death or multiple injured employees, contractors, or the public.
2.
Gas or vapor release requiring evacuation of third parties.
3.
Major spills, toxic gas releases, or other significant environmental damage.
4.
Blowouts.
5.
Fires not immediately controlled and extinguished, typically fires that involve third -party
emergency response.
6.
Vehicle accident with damage greater than $10,000.
7.
Property damage greater than $50,000.
3.2 HPR INCIDENT MANAGEMENT CHAIN OF COMMAND
When an emergency is identified, immediate notification must be made as soon as possible in
accordance with the guidance presented in this ERP.
The first person to identify the emergency will report it to their supervisor. If a person's
supervisor cannot be immediately reached with the known contact information (i.e., telephone
numbers of office, mobile phone, home, or pager) then the next person in the chain of
management must be notified. The supervisor or the first person ultimately notified by the
employee discovering the incident will initiate the appropriate HPR emergency incident
notification tree in accordance with the diagrams below.
HighPoint
RESOURCES
H POC Incident Colrmunication
EMPLOYEE
❑ISCCN ERI NG
INCIDENT
DR LLIRG OR COMPLET O4 J
ACTT ITr
DRILLING &
COMPLETIONS
MANAG ER
IFr1F1EE1IATE
SUPERVISOR
'311
appropriatel
FOREMAN AND! OR
AREA
SUPERINTENDENT
PRODUCTION
F.1ANAGER
V
coo
■ _
SENIOR DIRECTOR.
PRODUCTION
HUF. NRESYJRCES
I IrjuryrllInes:.
4
EHS
REPRESENTATI E
CEO
I _
GENERAL COUNSEL
DIRECTOR. EH&S
REGULATORY
AGENCIES
HighPoint
RESOURCES -
3.3 COMMUNICATION TECHNIQUES
The following guidance will be followed when making any notifications regarding an incident.
1. Communication must be through a two-way confirmed means. Use of messages on
voice mail or sending e-mail does not constitute notification. Level 1 incidents not
involving a spill may be communicated via e-mail. In all instances, a message may be left,
but the next person up the chain of command must also be contacted.
2. Supervisors or others dealing with the incident may delegate reporting responsibilities as
appropriate. However, when delegating these responsibilities, always instruct the person
to report back to you.
3. Make sure the person you are communicating with understands you. This can be done by
asking them to repeat the key parts of your discussion.
4. If you are calling someone you do not frequently talk to, make sure you identify yourself
and where you can be reached.
5. If working with radio communication, call out the person you want to talk to followed by
your name (e.g., "Kurt, this is Greg, do you read me?") Wait long enough for a response.
The person may be away from the radio and may need some time to get back.
6. If calling by telephone, let the phone ring at least six times before hanging up.
7. Do not hesitate to call above your supervisor if your supervisor is unreachable.
8. Have relevant information available before starting notification. This does not mean a
complete report of everything but has the following at a minimum.
a. Location or facility and call back phone number.
b. Type of emergency.
c. Time and date first noticed.
d. The magnitude of emergency (e.g., size of fire or spill, the number of people
involved, injuries, if other properties or companies are involved).
e. What you have done prior to making your notification.
f. What your plans are in responding to the emergency.
g. What are the weather conditions?
h. What, if any, outside notifications have been made.
i. What assistance you need.
j. When you will call back with a subsequent report.
HighPoint
RESOURCES -
3.4 MEDIA COMMUNICATIONS
Communications with media and local government officials are best handled by persons trained
in dealing with the media. All media inquiries should be directed to the Legal Department
unless the specific direction is given by these groups to individual personnel.
Estimates or speculations as to the cause or size of the problem must never be made. Assume
any camera or recorder in the area is ON at all times (it just may be). Encourage the media to
speak with Legal Department personnel in the Denver office for any detailed information.
33 NOTIFICATION OF EMPLOYEE'S FAMILY
All notification of family in the event of serious illness or injury will be the responsibility of the
Human Resources Department, with the assistance of the Area Superintendent. It is important
that family notification not be made prematurely and that certain facts are gathered before
notification.
4.0 ON -SCENE INCIDENT COMMAND
Refer to Section 3.2.
5.0 PRESERVATION OF EVIDENCE AND SITE SECURITY
In the aftermath of a serious incident, it becomes necessary to investigate the incident in order
to determine the cause and corrective actions. Perhaps the most important aspect of this
investigation is determining the facts, and as such, the preservation of the evidence is of great
importance.
With the assistance of field personnel involved at the incident scene, the evidence can be
preserved and a more beneficial investigation performed. The following are basic guidelines
which should be followed.
Secure the Area
Rope off or otherwise control access into the incident site. Access by non -company personnel
(including contractor personnel even if involved in the incident) is NOT allowed unless specific
management approval has been obtained. Establish a gate guard and ensure that a sign -in sheet
is maintained so anyone who entered the facility can be identified at a later date. ALWAYS ask
agency personnel to present identification and try to get a business card. The only exception is
necessary to access by emergency medical rescuers and firefighters.
Preserve the Evidence
As much as possible, do not disturb objects relating to the incident. If unavoidable, stake or mark
its location and record what was there, preferably by taking a series of photographs that show the
object in question and nearby permanent landmarks so the scene can be recreated if necessary.
Never allow evidence to leave the scene without approval.
HighPoint
RESOURCES -
Document the Evidence
Take notes, photographs, and or voice notes about EVERYTHING. You cannot create too much
documentation. Remember, you are documenting site conditions for reference YEARS in the
future. Take immediate steps to protect all documentation and immediately provide any
documentation to the leader of the incident investigation team after the initial emergency response
actions have concluded.
Identify Witnesses
If persons who witnessed the incident cannot remain on the scene to be interviewed during the
investigation, get their names and pertinent information so they can be located later.
6.0 EMERGENCY RESPONSE SCENARIOS
6.1 RESPONSE TO AN INJURY OR ILLNESS
1. Shut down all work activity.
2. Assess the situation and severity. If safe to do so, remove or mitigate any immediate
hazards that could further injury or cause injury to other emergency responders.
3. Contact 911/Emergency services (as needed).
• Follow the instructions of the operator at all times.
• Provide as much information as possible to the operator.
4. Send a designated person to the nearest county road or street intersection to wait for
emergency services. If you think a helicopter evacuation may be necessary, direct an
individual to establish a landing zone.
5. The employee(s) at the scene who is/are most qualified to do so will render first aid or
assistance and assign field personnel to initiate HPR emergency notification protocol.
Notification will include, at a minimum, the following.
• Date and time of the incident.
• Location of incident (with directions to the site).
• Description of incident and nature of injuries.
• Location where injured employee was moved to.
• The identity of emergency services present at the site.
Other considerations (media attention, regulatory agencies at the site, etc.)
6. All unneeded field personnel, contractors, and visitors who are not assisting the victim
should be evacuated from the site by directing them to assemble at the facility's
designated primary area.
HighPoint
RESOURCES -
7. Area Superintendent or Foreman (or designee) will complete the appropriate incident
report form and submit to local Health and Safety (H&S) coordinator or EHS Manager.
8. EHS Manager or designee will notify appropriate regulatory agencies and the Legal
Department in accordance with the HPR incident communication protocol.
6.2 RESPONDING TO A LEAK OR SPILL (Coordinate with SPCC Plan as applicable)
1. Shut down all work activity.
2. Evacuate all unneeded field personnel, contractors, and visitors from the site.
• Send all unneeded persons to appropriate muster area.
• Keep all persons uphill and crosswind from the chemical source.
3. Assess the situation and severity. If safe to do so, take actions to safely stop the release,
contain it to the location, and prevent the spill from reaching surface water.
4. Contact 911/Emergency services (as needed).
• Follow the instructions of the operator at all times.
• Provide as much information as possible to the operator.
5. Send a designated representative to the nearest county road or street intersection to wait
for emergency services.
6. Notify the appropriate supervisor who will, in turn, initiate the HPR incident
communications protocol. Provide details of the estimated volume spilled, the status of
discharge, and other details that will facilitate response and cleanup.
7. The Area Foreman will mobilize material, equipment, and manpower to stop, contain, and
clean up the discharge of the spill. The Area Foreman will also complete the appropriate
HPR incident reporting forms.
8. EH&S personnel will:
a. Notify appropriate regulatory agencies and the Legal Department;
b. Complete the appropriate agency incident reports; and
c. Provide remediation guidance.
Notes:
a. For the guidance of the proper handling and disposal of wastes generated during
spill response and cleanup, contact EH&S Dept.
b. All spills (crude oil, condensate, produced water, hazardous chemicals, or
exploration and production waste) greater than one barrel or any volume that affects
surface water or groundwater needs to be reported to the Area Foreman and the
EH&S Department immediately.
HighPoint
RESOURCES -
c. What is "surface water"? In addition to ponds, lakes, streams, and rivers, "surface
water (or navigable waters)" can be defined as dry ditches, irrigation canals,
wetlands, sloughs, and any other natural or man-made surface feature that contains
water at least part of the time.
6.3 RESPONDING TO A FIRE
1. Shut down all work activity.
2. Evacuate all unneeded field personnel, contractors, and visitors from the site.
a. Send all unneeded persons to appropriate muster area.
b. Keep all persons uphill and crosswind from the chemical source.
3. Assess the situation and severity. If safe to do so, take actions to safely extinguish the fire
and/or eliminate the fuel source. Attempt to fight the fire if:
• You know what is burning,
• You have adequate training to fight a fire,
• You have the adequate tool to fight a fire, and
• You have a safe exit out.
4. Contact 911/Emergency services (as needed).
Follow the instructions of the operator at all times.
Provide as much information as possible to the operator.
5. Send a designated representative to the nearest county road or street intersection to wait
for emergency services.
6. Notify the appropriate supervisor who will, in turn, initiate the HPR incident
communications protocol. Provide details of the incident and other details that will
facilitate response.
7. Control access to the site - only allow approved personnel and emergency services to
enter the site.
6.4 RESPONDING TO A H2S RELEASE
1. Refer to the hydrogen sulfide (H2S) safety program for complete details on working with
H2S safely.
2. Prior to beginning work, establish roles and responsibilities for crews working on job sites
that may contain H2S.
a. H2S MONITORING/CLIMATIC CONDITIONS TEAM — Responsible for monitoring
ambient air concentrations or hazardous gases near a leak area, calculating H2S
radius of exposure, and monitoring climatic conditions (wind direction, wind velocity,
HighPoint
RESOURCES -
etc.). The team coordinator will keep the Communications Team advised of the
monitoring results and any changes that occur.
b. ROAD BARRICADE — Responsible for establishing roadblocks in areas affected by a
potentially hazardous leak. Team members may be assisted by the sheriffs
department and/or the Department of Public Safety.
c. PUBLIC RELATIONS, COMMUNICATIONS, AND DOCUMENTATION TEAM —
Responsible for coordinating teams, communications between team members, and
coordinating duties of public safety officials. The team will document a record of
events and the safety and control measures taken during the incident. The
coordinator of this team will keep the Superintendent up to date on leak events
relating to public relations with the news media, public, and various public safety/fire
officers. Safe areas will be established as appropriate.
d. EVACUATION TEAM (FIELD) — Team members will be responsible for notifying and
evacuating residents from a hazardous area to a place of safety.
3. Response Team Members and Duties Form will be completed by Operations personnel for
all H2S operations activities.
6.4.1 When an H2S Leak Occurs
1. Shut down all work activity.
2. Evacuate all unneeded persons from the site.
a. Evacuate uphill and crosswind from a chemical source.
b. Be conscious of wind.
c. Send all unneeded persons to appropriate muster area.
• Keep all persons uphill and crosswind from a chemical source.
• Assess the situation and severity.
d. Take actions to safely stop the release.
• Follow respiratory protection guidelines.
3. Contact 911/Emergency services (as needed).
a. Follow the instructions of the operator at all times.
b. Provide as much information as possible to the operator.
c. Send a person to the nearest county road or street intersection to wait for emergency
services.
4. Administer First Aid/CPR to any affected persons.
• Follow First Aid/CPR guidelines.
5. Control access to the site.
• Only allow approved personnel and emergency service to enter the site.
6. You may be required to establish a landing area for a helicopter.
HighPoint
RESOURCES-
• Follow the helicopter landing guidelines.
7. Follow the HPR incident reporting procedure.
6.4.2 Responding to H2S Leaks
A leak may be detected and/or reported by various individuals/the public, HPR personnel,
contractors, public safety officials, etc.
1. Once a leak has been determined to be from an HPR facility, the following information will
be obtained and relayed to the Superintendent/Area Foreman/designee:
• Type of leak.
Personal injuries.
• Location and magnitude of the leak.
• Direction and velocity of the wind.
Residents, businesses, and highways located downwind of the leak.
• Your action and/or advice concerning the evacuation of nearby residents and
businesses or establishing roadblocks.
• The action being taken to alleviate the situation.
• Time emergency occurred or was reported.
• Estimate of damage to date and potential future damage.
2. The Superintendent/Area Foreman or designee will be in charge of the actual on -site
operations.
3. The Superintendent/Area Foreman or designee will assign someone to monitor the
company radio frequency. Carry a 2 -way radio or bring a company truck with radio as
close as safely possible and maintain communications with response personnel.
4. The highest ranking HPR employee will be in charge of all actions until the
Superintendent/Area Foreman or designee arrives. Personal protective equipment (PPE)
should be used as appropriate.
5. Operating personnel will attempt to determine the seriousness of the situation and notify
immediately other field personnel in the area.
6. Gather all field personnel, contractors, and visitors at the rendezvous point, depending on
the release location.
7. Recall employees if the emergency happens off -hours. (Numbers are listed in the contact
information section of this ERP.)
8. Contact EH&S personnel.
9. Maintain a log of all contacts with residents, regulatory and law enforcement agencies,
other operators, etc.
HighPoint
RESOURCES -
10. Determine whether assistance is needed from public safety officials.
11. Operating personnel should attempt (from a safe area) to shut-in the leak and be alert for
chemical and/or liquid hydrocarbon run-off. If chemicals are involved in a fire, think of the
consequences before you use water on the fire. It may be better to contain the fire and let
the chemicals incinerate. Close off the area. If you do not have the necessary equipment,
appropriate heavy equipment contractors should be contacted.
12. If injuries have been sustained, start first aid procedures and call for ambulance service if
needed, organize search and rescue if anyone is still unaccounted for.
13. If gas escape cannot be safely shut-in, stopped, etc., and presents a hazard to residents,
field personnel, or property, the following steps should be taken.
a. Determine if the sour gas being released should be safely ignited to protect
residents. The appropriate agency should be contacted for approval prior to any
flaring of sour gas.
b. Initiate Evacuation Procedure.
63 RESPONDING TO INCLEMENT WEATHER
If weather becomes severe to the point it threatens the safety of workers, it is a best practice to
evacuate or "cab up" until safe to return to work.
1. Contact supervision to determine the severity of the storm.
2. Shut down all work activity.
3. If possible, shut-in wells and production equipment.
4. Evacuate all unneeded persons from the site.
5. Assess the situation and severity of the situation.
TORNADO - It may not be best to evacuate. Use the best judgment if a tornado is in sight. Go
to the lowest point possible (i.e., ditches, culverts, creek bottoms). Do not stay in a vehicle! Lay
face down and cover your head with your hands. Keep all PPE on; this can help protect you from
flying debris. Wait for the storm to pass.
THUNDER/LIGHTNING — When you see lightning or hear thunder, "cab up" in a vehicle for 30
minutes from the last sighting. If lightning or thunder continues for more than one hour, shut
crews down and contact your supervisor.
HIGH WINDS — Do not work at heights. If a crane is being utilized, shut it down when winds
become higher than 25 miles per hour (mph). "Cab up" and wait for the wind to stop. Keep all
PPE on while in high winds. PPE can help protect from flying debris.
HighPoint
RESOURCES -
SEVERE RAIN — If driving and severe rain occur, pull to the side of the road and wait for the rain
to pass. Pull as far to the right as possible. Turn on hazard lights. If on a work sight, "cab up"
until the rain passes.
FLOODING — If you are in an area that is prone to flooding, never attempt to stay on location
when flooding occurs. Find the best route to high ground and remain until safe. Never drive
through standing water.
HAIL — If hail occurs while on site, keep PPE on at all times. PPE can help protect you from falling
ice. Seek shelter in a building or vehicle until the storm passes.
WINTER WEATHER (Blizzards and severe snow storms) — If severe winter weather occurs while
on site, contact the National Weather Service, listen to the radio or television, or communicate
with your supervisor to monitor the storm. Avoid unnecessary driving and seek shelter
immediately.
6. Contact 911/Emergency services (as needed) If you're trapped by floods or there is an
injured person.
• Follow the instructions of the operator at all times.
• Provide as much information as possible to the operator.
• Send a person to the nearest county road or street intersection to wait for emergency
services.
7. Administer First Aid/CPR to any affected person as needed.
• Follow First Aid/CPR guidelines.
8. Control access if the site is not safe.
• Only allow approved personnel and emergency services to enter the site.
9. You may be required to establish a landing area for a helicopter.
10. Follow the HPR incident reporting procedure.
6.6 RESPONDING TO A BOMB THREAT OR TERRORIST ACTIVITY
Bomb threats have become fairly common place. You may be confronted with this situation at
any time. Bomb threats are frequently for the purpose of annoyance rather than destruction.
However, each situation must be approached as though the bomb threat is a reality. Approach
a bomb situation calmly, cautiously, deliberately, and without delay. Be alert; it may be a highly
dangerous situation or merely a prank; therefore, avoid the hysterical or excited approach. If
evacuation appears to be desirable, limit the alarm and evacuation to the area probably
affected.
Don't use cellular phones (turn them off) or communication radios if a call comes in. This could
detonate certain types of devices. The bomb type may be incendiary or an explosive device
used for material destruction, disruption of normal activities, or to disturb employee morale. A
bomb threat may be received by anyone in the company. It is important that a call of this nature
HighPoint
RESOURCES -
be handled in accordance with an established plan. Be sure to obtain the necessary information
and notify your supervisor.
1. SUPERVISOR'S RESPONSIBILITY
In order to detect, prevent, or minimize the effect of sabotage, each supervisor
should critically analyze their situation with respect to vulnerability to sabotage and
make appropriate improvements to protect against sabotage.
2. ACTIONS
a. Immediately safeguard personnel — including any other affected parties (other
offices, or residents).
b. If it is a telephone threat, remain calm and get as much information as possible.
• Time of call.
• As close as possible to the exact wording.
• Sex and age of caller (if identifiable) (young, old, etc.).
O Foreign or identifiable accents.
O Distinguishable background noise.
O Bomb location (specific as possible).
O When the bomb is supposed to detonate.
O Kind and size of the bomb.
• How the bomb got into the facility.
c. Assemble all non -essential personnel at the staging area and ensure that Sight
Security accounts for everyone. Evacuate to a safer location if necessary.
d. Plan to combat the emergency and minimize damage.
e. Notify Building Management.
f. Notify the sheriff's department (911).
6.6.1 Unknown Location of Bomb
1. As field personnel sweep their assigned areas, have them look for anything out of the
ordinary.
2. Any suspicious item may be a bomb. DO NOT TOUCH THE DEVICE. REPORT THE
LOCATION TO THE INCIDENT COMMANDER
3. If the location is determined, evacuate the immediate area. (Size of area evacuated
determined by the hazards)
4. Notify upper Management and sheriff's department.
5. Assist sheriff's department as necessary
HighPoint
RESOURCES -
6. Establish a hot zone
6.6.2 Exploded Bomb
1. Preserve any evidence if possible!
2. Assist any injured personnel in the safest possible manner.
3. Protect the rescuers so there are not more victims.
4. Notify the sheriffs department and fire department if necessary.
5. Notify the hospital of patient status and help them decide if more response is necessary.
6. React correctly to any fire problems to minimize hazards and equipment damage.
7. Notify management.
6.6.3 Extortion Threats
1. If money is mentioned, collect all the information listed in step 6.6.
2. Advise the caller that all requests for money must go through management personnel.
3. Transfer the call, ensuring you do it properly, and await instructions from supervisors.
6.7 RESPONDING TO UNAUTHORIZED VISITORS / PROTESTORS
You may be confronted with unauthorized visitors and/or protestors at any time. Approach the
situation calmly, cautiously, deliberately, and without delay. Be alert; it could develop into a
highly dangerous situation; therefore, avoid the hysterical or excited approach. If evacuation
appears to be desirable, limit the alarm and evacuation to the area probably affected. A civil
protest will usually take the form of an organized public demonstration of disapproval or display
disagreement with an idea or course of action. It should be noted that in many cases, protests
such as marches, meetings, picketing, and rallies will be peaceful and non -obstructive. A
protest should not be disrupted unless one or more of the following conditions exists as a result
of the demonstration:
• Disruption of the normal operations of the HPR facility.
• Obstructing access to offices, buildings, or other HPR facilities.
• The threat of physical harm to persons or damage to HPR facilities.
• Willful demonstrations within the interior of any HPR building or structure, except as
specifically authorized and subject to reasonable conditions imposed to protect the
rights and safety of other persons and to prevent damage to property.
Unauthorized entry into or occupation of any HPR room, building, or area of the
campus, including such entry or occupation at any unauthorized time, or any
unauthorized or improper use of any HPR property, equipment, or facilities.
1. IMMEDIATE ACTION AND DECISION MAKER(S)
HighPoint
RESOURCES -
If any of the above conditions exist, the local police or sheriffs department should be
notified. Depending on the nature of the protest, the appropriate procedures listed
below should be followed.
a. Peaceful, Non -Obstructive Protest
Generally, peaceful protests should not be interrupted. Protestors should not be
obstructed or provoked and efforts should be made to conduct HPR business as
normally as possible. If protestors are asked to leave but refuse to leave,
arrangements may be made by HPR management to treat the violation of regular
operating hours as a disruptive protest.
b. Disruptive Protests
In the event that a violent protest in which injury to persons or property occurs or
appears imminent, the following will occur.
2. ACTIONS
a. Immediately safeguard personnel — including any other affected parties (other
offices, or residents)
b. Assemble all non -essential personnel at a staging area and ensure that Sight
Security accounts for everyone. Evacuate to a safer location if necessary.
c. Plan to combat the emergency and minimize damage.
d. Notify facility management.
e. Notify the sheriffs department (911).
Efforts should be made to secure positive identification of protestors in violation to facilitate later
testimony, including photographs if deemed advisable. Additionally, efforts should be made to
videotape any police action for future reference.
1. SUPERVISOR'S RESPONSIBILITY
In order to detect, prevent, or minimize the effect of sabotage, each supervisor
should critically analyze their situation with respect to vulnerability to sabotage and
make appropriate improvements to protect against sabotage.
HighPoint
FIGURE 1
FOX CREEK 33 NW COMPRESSOR STATION PLOT PLAN
��`----------------------------------- I
PROJECT
LOCkTION
VICINITY MAP
w
IUN
TI IN
`: ICI N MAP LEGENC
PARCEL BOUNDARY MAP
29
29
3'_
33
-E:TI�NE X5,:9 1213, T ETH EN.
RESOURCES
HighPoint
APPENDIX A — HPR CONTACT INFORMATION
HPR CONTACT LIST
OFFICE
MOBILE
Toll -Free 24 -Hour Emergency Number: 1-800-880-
6359
Rusty Frishmuth —Director, EH&S
303-312-8718
303-518-
2290
Doug Dennison — Director, Community Affairs
970-353-0407 ext.
970-270-
6015
2853
Dustin Watt — Sr. EHS Specialist
970-353-0407 ext.
303-656-
6005
1838
Scot Woodall — Chief Executive Officer & President
303-312-8610
Paul Geiger — Chief Operating Officer
303-312-8787
Ken Wonstolen — SVP, General Counsel
303-312-8170
Mike Jury — Maintenance Foreman
970-353-0407 ext.
6018
970-319-
6184
Brett Paben — Area Superintendent
970-353-0407 ext.
6003
970-319-
4690
303 -294 -
Scott Ri Production Foreman ppy
7810
Dustin Stransky — Production Foreman
303-294-
7805
Michael Herricks — Construction Foreman
970-353-0407 ext.
970-987-
6016
3827
RESOURCES
HighPoint
RESOURCES
APPENDIX B - EMERGENCY SERVICES CONTACT INFORMATION
DJ BASIN - COLORADO EMERGENCY SERVICES PHONE LIST
LAW ENFORCEMENT
Colorado State Patrol — District 1A, 3C
303-239-4501
Weld County Sheriff
970-304-6467
Greeley Police Department
970-356-4015
FIRE
Briggsdale Fire Department
970-350-9600 x4
HOSPITALS
Cheyenne Regional Medical Center— West Campus
307-634-2273
Greeley- North Colorado Medical Center
970-352-4121
Flight for Life
720-321-3900
CONTRACTORS
Custom Environmental Services, Inc.
303-423-9949
HighPoint
RESOURCES
APPENDIX C - EMERGENCY MEDICAL FACILITY DIRECTIONS
Driving directions from Fox Creek 33 NW Compressor Station to Cheyenne Regional Medical
Center — West Campus
Head east then south on existing access road toward County Road 132
Turn left onto County Road 132
Turn left onto County Road 71
Road name changes to County Road 147
Continue on Chalk Bluff Rd. Take Rd 209/Campstool Rd and 1-80 W to E 23rd St in Cheyenne
Turn left onto Chalk Bluff Rd
Turn right onto County Rd 138
Continue onto Co Rd 138
Continue onto Rd 209/Campstool Rd
Turn left to merge onto 1-80 W toward Laramie
Turn right onto 1-180 N/I-25BL/US-85 N (signs for Central Ave)
Drive to E 23rd St
Cheyenne Regional Medical Center - West Campus, 214 E. 23rd St., Cheyenne, WY 82001
Driving directions from Fox Creek 33 NW Compressor Station to North Colorado Medical Center
Turn right onto Co Rd 71
Turn left onto CR 136/Weld County Rd 136
Turn right onto Co Rd 77
Continue onto CO -392 W
Turn left onto Co Rd 47
Slight right toward E 8th St
Slight right onto E 8th St
Turn left onto US -85 S
Turn right at the 1st cross street onto 13th St
Turn left onto 21st Ave
Turn left
Sharp right, destination will be on the right.
North Colorado Medical Center, 1801 16th Street Greeley, Colorado 80631
1.0 mi
1.8 mi
2.8 mi
28.8 mi
9.5 mi
1.2 mi
2.5 mi
8.6 mi
5.2 mi
1.6 mi
459 ft
0.5 mi
2.9 mi
27.0 mi
18 mi
3.7 mi
213 ft.
3.1 mi
0.5 mi
1.7 mi
0.3 mi
325 ft.
187 ft.
HighPoint
RESOURCES
APPENDIX D - AGENCY CONTACT INFORMATION
REGULATORY AGENCIES
COGCC
303-894-2100
CDPHE
877-518-5608
WELD COUNTY O&G LIASON
970-304-6496 x4395
NATIONAL REPORTING CENTER
(NRC)
800-424-8802
EPA Region VIII
800-277-8917
FED EPA; CO, UT, WY
303-312-6312
OSHA -CO
303-530-6901
Weld County Office of Emergency
Management, Attn: Roy Rudisill
Office 970-304-6540
Cell 970-381-0417
HighPoint
=RESOURCES=
APPENDIX E — Helicopter Landing Zone
Landing Zone (LZ) Criteria
I CO' IA :l x t C9' Loo
L e'rBI rih zl lee !' orfeCe
Clear of s.encl. gravel end other dehrls
NO pa.,er Iirles. ;teen- p,den bII.IC Irl J:3. OI ❑tlie_r overlledU rbstru,Lorls near or Ill !Ile 'nIce
No vehicles or people `.':' din [lie zone
Avoid sloped areas
Marking the Landing Zone (LZ)
`/ventrue:=on cones
T'.-; ra vBllri: `e.9 ...r111 eze )dligltil5 Gi OSSe{I eL tr.?. 4n"[ef of :fie LZ
Smoke canisters during cnyl:ght operations
Battery operated strobe lights
ir.',ylrri'E { dE it -I i10 he CEC
k.-tark•r .iiC Su Crl CC Ilarfier tape flag Tape 0IC S11pu:o :!o' tie 1 1011
LZ Coordinator Responsibilities
Command and secure the LZ
Establish radio contact with aircraft
Assist pilot in locating the LZ
Keep all bystanders 100' away form :he LZ
Keep everyone away from the tail rotor
Contact p lot after landing to determine any safety issues
Helicopter Safety
Approach and depart the aircraft from the side only
Never walk around the tail rotor
Shield your eyes from rotorwasla during landing and takeoff
Do not carry anything above your head
Do not approach the helicopter while the blades are turning unless instructed by the CareFlite crew
Do not run towards the aircraft approach in a calm and slow manner
No smoking anywhere in the vicinity of the aircraft
The pilot andior medical crew control activity around the aircraft
Secure loose items such as hats, clothing, stretcher streets, and any other object light enough to be blown into the rotor
blades
HighPoint
RESOURCES
APPENDIX F — Plan Review Log
Al] Site personnel. with their sianottire below. acknowle e they li;ive been briefed on the abu; e Eniergene
Response Plan and are familiar with its provision. they alwo acknowledge that Ploy have received the appropriate
safety trainins pertaining to their joh tunctions.
Name
l itle Organization
Date Signature
Fox Creek 508-33H Compressor
Pad Noise Modeling Report
October 31, 2019
Prepared for:
HighPoint Resources
33105 WCR 33
Greeley, CO 80631
Prepared by:
Behrens and Associates, Inc.
13806 Inglewood Avenue
Hawthorne California, 90250
6 -St( ( wed'
Carol Colby
Acoustical Engineer
Jason Peetz
Engineering Manager
IMF
Corporate Office: Hawthorne. California
Carson, California - Aledo. Texas - Napa California -- Longmont. Colorado -- McDonald. Pennsylvania
800-679-8633
www.environmental-noise-control.com - www.drillingnoisecontrol.com
fah
Behrens and Associates, Inc.
Environmental Noise Control
1. Introduction
The following report provides a noise modeling assessment of the proposed Fox Creek 508-33H Compressor Pad
operated by HighPoint Resources in relation to the commercial zone allowable noise limits found in Colorado Revised
Statutes (CRS) 25-12-103 noise regulations per the Developmental Standards of the Use by Special Review (USR)
permit application with Weld County. The noise modeling includes currently proposed mechanical equipment
identified in the plan drawings dated 9/14/19. The Fox Creek 508-33H SW Compressor Pad Facility (40°58'19.64"N,
104°26'45.72"W) is located approximately 1.0 mile south of County Road 138 and 2.9 miles west of County Road
71 in Weld County, Colorado. Figure 1-1 identifies the pad location.
To assess the predicted noise levels of the proposed operations, manufacturer sound level data of proposed equipment
was used. The equipment sound level data was used to construct a noise model using SoundPLAN 8.0 software.
The following is provided in this report:
• A brief introduction of the fundamentals of noise.
• A review of the applicable CRS 25-12-103 noise standards and USR noise limits.
• Discussion of noise modeling methodology and results.
• An assessment of the predicted noise modeling results
Figure 1-1 Compressor Station Location
Introduction
1
Behrens and Associates, Inc.
Environmental Noise Control
2. Noise Fundamentals
Sound is most commonly experienced by people as pressure waves passing through air. These rapid fluctuations in
air pressure are processed by the human auditory system to produce the sensation of sound. The rate at which sound
pressure changes occur is called the frequency. Frequency is usually measured as the number of oscillations per
second or Hertz (Hz). Frequencies that can be heard by a healthy human ear range from approximately 20 Hz to
20,000 Hz. Toward the lower end of this range are low-pitched sounds, including those that might be described as a
"rumble" or "boom". At the higher end of the range are high-pitched sounds that might be described as a "screech"
or "hiss".
Environmental noise generally derives, in part, from a combination of distant noise sources. Such sources may include
common experiences such as distant traffic, wind in trees, and distant industrial or farming activities. These distant
sources create a low-level "background noise" in which no particular individual source is identifiable. Background
noise is often relatively constant from moment to moment but varies slowly from hour to hour as natural forces
change or as human activity follows its daily cycle.
Superimposed on this low-level, slowly varying background noise is a succession of identifiable noisy events of
relatively brief duration. These events may include the passing of single -vehicles, aircraft flyovers, screeching of
brakes, and other short-term events. The presence of these short-term events causes the noise level to fluctuate.
Typical indoor and outdoor A -weighted sound levels are shown in Figure 2-1.
COMMON OUTDOOR
SOUND LEVELS
B-747-200 Takeoff at 2 mi.
Gas Lawn Mower at 3 ft.
Diesel Truck at 150 ft.
DC -9-30 Takeoff at 2 mi.
Noisy Urban Daytime
B-757 Takeoff at 2 mi.
Commercial Area
sl
s
Quiet Urban Daytime
Quiet Urban Nighttime
Quiet Suburban Nighttime
Quiet Rural Nighttime
y . • s,.z,
jZ r s-
LCsue. ;,1 I ; '
1
-1
NOISE LEVEL COMMON INDOOR
dB (A) SOUND LEVELS
110 Rock Band
100 Inside Subway Train
(New York)
90
80
70
Normal Speech
60 at3ft.
50
40
30
20
10
Food Blender at 3 ft.
Garbage Disposal at 3 ft.
Shouting at 3 ft.
Vacuum Cleaner
at 10 ft.
Large Business Office
Dishwasher Next Room
Small Theatre, Large
Conference Room
(Background)
Library
Bedroom at Nig t
Concert Hall (Background
Broadcast & Recording
Studio
0 Threshold of Hearing
Figure 2-1 Typical Indoor and Outdoor A -Weighted Sound Levels
Noise Fundamentals
2
Behrens and Associates, Inc.
Environmental Noise Control
3. CRS 25-12-103 Noise Standards
The modeling analysis was developed to predict operational noise levels at adjacent properties and verify compliance
of operations with the CRS 25-12-103 noise standards. The CRS code establishes permissible sound levels by type
of property and hours of the day. The measurement location is defined in Section 25-12-103(1) as "Sound levels of
noise radiating from a property line at a distance of twenty-five feet or more therefrom in excess of the dB(A)
established for the following time periods and zones shall constitute prima facie evidence that such noise is a public
nuisance."
With regards to the applicable zoning noise limits for the proposed Fox Creek 508-33H pad, Note 18 of the USR
Permit — Development Standards provided on Sheet C002 of the Use by Special Review Submittal Plans for the
HighPoint Resources Fox Creek 508-33H Compressor Pad states "The facility shall adhere to the maximum
permissible noise levels allowed in the Commercial Zone District, as delineated in Section 25-12-103 C.R.S."
Based on the specifications of CRS 25-12-103 and the USR Permit Development Standards, the commercial noise
level limits listed in Table 3-1 are applicable to the site and will be used to assess the noise impact of the site.
Table 3-1. Colorado Noise Related Statues 25-12-103 (1) — Maximum Permissible Noise Levels
'Lone
Maximum Noise (dBA)
7:00 am to next 7:00 pm
Maximum Noise (dBA)
7:00 pm to next 7:00 am
Residential
55 dBA
50 dBA
Commercial
60 dBA
55 dBA
Light Industrial
70 dBA
65 dBA
Industrial
80 dBA
75 dBA
CRS 25-12-103 Noise Standards
3
Behrens and Associates, Inc.
Environmental Noise Control
4. Fox Creek 508-33H Compressor Pad Facility Noise Modeling
4.1 Noise Modeling Methodology
The noise modeling was completed with use of three-dimensional computer noise modeling software. All models in
this report were developed with SoundPLAN 8.0 software using the ISO 9613-2 standard. Noise levels are predicted
based on the locations, noise levels and frequency spectra of the noise sources, and the geometry and reflective
properties of the local terrain, buildings and barriers. SoundPLAN 8.0 software simulates light downwind conditions
in all directions to ensure conservative assessments. The predicted noise levels represent only the contribution of the
proposed compressor station operations and do not include ambient noise or noise from other facilities. Actual field
sound level measurements may vary from the modeled noise levels due to other noise sources such as traffic, other
facilities, other human activity, or environmental factors.
The equipment sound level data used in the Fox Creek 508-33H Compressor Pad modeling was sourced from
equipment manufacturer data and calculated data. The modeling results predicted are dependent on equipment and
mitigation orientation as indicated in this report. Figure 4-1 shows the Fox Creek 508-33H Compressor Pad plot plan
and mechanical equipment layouts utilized in the study. Table 4-1 lists the equipment included in the modeling based
on project designs current to the writing of this report.
Table 4-1 Equipment Modeled for Fox Creek 508-33H Compressor Pad
Quantity Equipment Type
Proposed Equipment
Data Source
Source Sound
Power Level
(Lw dBA)
3 Compressor Engine
3
Compressor Engine
Exhaust
3 Cooler Fan Intake
3 Cooler Fan Discharge
4 VRU
Waukesha 7044GSI S5
Waukesha 7044GSI with
900H Series Hospital Grade
Silencer (Appendix B)
AXH 132FF2
AXH 132FF2
Quincy QR-5120
Manufacturer Data
Manufacturer Data
Manufacturer Data
Calculated Data
Manufacturer Data
102.7
71.1
100.6
90.6
98.5
4.2 Noise Sensitive Receptors
The noise sensitive receptors have been chosen to be consistent with the requirements of the CRS 25-12-103 noise
standards and the proposed property boundaries. The standards indicate that "sound levels of noise radiating from a
property line at a distance of twenty-five feet or more therefrom in excess of the dB(A) established for the following
time periods and zones shall constitute prima facie evidence that such noise is a public nuisance." As such, receptor
locations were chosen at a boundary representative of the 25 feet from the proposed site boundary of the Fox Creek
508-33H Compressor Pad to represent potential regulatory measurement points should a complaint be made. Figure
4-2 shows the dBA noise sensitive receptor locations.
Fox Creek 508-33H Compressor Pad Facility Noise Modeling
4
Behrens and Associates, Inc.
Environmental Noise Control
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Figure 4-1 Fox Creek 508-33H Compressor Pad Plot Plan (Plot Date 9/14/19, Drawing # FC-33SW-PP-101)
Fox Creek 508-33H Compressor Pad Facility Noise Modeling
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Figure 4-2 Noise Sensitive Receptor Locations (dBA)
Fox Creek 508-33H Compressor Pad Facility Noise Modeling
6
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4.3 Noise Modeling Results
Two modeling scenarios were created to represent the site operations with and without mitigation as described in
Table 4-2. The results of the noise modeling are presented in Table 4-3. The locations in the tables correspond to the
receptor locations identified in Figure 4-2. The results of the noise modeling are also shown as noise contour maps.
Figure 4-4 shows the Scenario 1 Noise Contour Map in dBA and Figure 4-5 shows the Scenario 2 Noise Contour
Map in dBA. The noise contours are provided in 5 dB increments with the color scale indicating the sound level of
each contour.
Table 4-2 Modeled Scenarios
Modeled Scenario Description
Scenario 1
Scenario 2
Compressor skids are modeled with 3 Waukesha 7044GSI S5 compressor engines
enclosed in a sound transmission class (STC) rated building of approximately 32 per
the building data provided by HighPoint and four Quincy QR-5120 VRUs. The
Waukesha 7044GSI exhausts are modeled with a hospital grade series 900H silencer
having an attenuation shown in Appendix B. All three compressor cooler fans are
facing south.
Same as Scenario 1 with the addition of 15 -foot high by 170 -foot long acoustical
barriers with a Sound Transmission Class (STC) rating of at least 40 near the west
edge of the property boundary. (see Figure 4-3).
Table 4-3 Noise Modeling Results (dBA)
Receptor Location Description Scenario 1 Scenario 2
Location 1 Proposed North Boundary
Location 2 Proposed East Boundary
Location 3 South Boundary
Location 4 West Boundary
55.6 55.6
54.8 54.8
53.3 53.3
58.2 53.8
Allowable Noise 25 ft. from the property line of potential noise
Level complainant.
60.0 Day / 55.0 Night
The numerical and graphical noise modeling results for Scenario 1 indicate that the proposed operations of the Fox
Creek 508-33H Compressor Pad are predicted to exceed the commercial CRS noise limits at Receptor 1 by 0.6 dBA
and at Receptor 4 by 3.2 dBA. With implementation of the recommendations outlined in Scenario 2, all modeled
receptor locations will comply with the daytime and nighttime dBA limits for CRS 25-12-103 except at the north
boundary where it will exceed slightly by 0.6 dBA during nighttime hours.
Fox Creek 508-33H Compressor Pad Facility Noise Modeling
7
Behrens and Associates, Inc.
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i
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Figure 4-3 Scenario 2 Equipment and Mitigation Layout (Plot Date 9/14/19, Drawing #FC-33SW-PP-01)
Fox Creek 508-3314 Compressor Pad Facility Noise Modeling
8
Figure 4-4 Scenario 1 Noise Contour Map (dBA)
Behrens and Associates, Inc.
Environmental Noise Control
Noise Level, dBA
= 30.0
= 35.0
= 40.0
= 45.0
= 50.0
= 55.0
= 60.0
= 65.0
= 70.0
= 75.0
= 80.0
= 85.0
= 90.0
0 250 500 750
feet
Fox Creek 508-33H Compressor Pad Facility Noise Modeling
9
Behrens and Associates, Inc.
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Figure 4-5 Scenario 2 Noise Contour \ lap (dBA)
Fox Creek 508-33H
Assessed Boundary
Noise Level, dBA
= 30.0
= 35.0
= 40.0
= 45.0
= 50.0
= 55.0
= 60.0
= 65.0
= 70.0
= 75.0
= 80.0
= 85.0
= 90.0
250 500 750
feet
Fox Creek 508-33H Compressor Pad Facility Noise Modeling
10
Behrens and Associates, Inc.
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5. Conclusion
Predictive noise models were created to represent the proposed operations at the proposed Fox Creek 508-33H
Compressor Pad operated by HighPoint Resources. Noise sensitive receptor locations included in the models were
placed in accordance with the noise standards of CRS 25-12-103 and Fox Creek 508-33H USR Development
Standards and the proposed site boundaries supplied by HighPoint Resources.
The numerical and graphical noise modeling results for Scenario 1 indicate that the proposed operations of the Fox
Creek 508-33H Compressor Pad are predicted to exceed the commercial CRS noise limits. With implementation of
the recommendations outlined in Scenario 2, all modeled receptor locations will comply with the daytime and
nighttime dBA limits except at the north proposed property boundary where it will slightly exceed the 55 dBA noise
limit by 0.6 dBA during nighttime hours.
Conclusion
11
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Appendix A Glossary of Acoustical Terms
Glossary of Acoustical Terms
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Ambient Noise
The all -encompassing noise associated with a given environment at a specified time, usually a composite
of sound from many sources both near and far.
Average Sound Level
See Equivalent -Continuous Sound Level
A -Weighted Decibel Scale
The human ear is more sensitive to some sound frequencies than others. It is therefore common practice to
apply a filter to measured sound levels to approximate the frequency sensitivity of the human ear. One such
filter is called the A -weighted decibel scale which emphasizes sounds between 1,000 and 5,000 Hertz by
discounting the frequencies outside of this range. As the human ear is less sensitive to low frequency noise,
the A -weighted decibel scale begins to increasingly discount noise below 500 Hertz.
Measurements conducted utilizing the A -weighted decibel scale are denoted with an "(A)" or "A" after the
decibel abbreviation (dB(A) or dBA). The A -weighted scale is nearly universally used when assessing noise
impact on humans.
C -Weighted Decibel Scale
High level low frequency noise can propagate large distances from its source. Although not always audible,
high levels of low frequency noise can induce vibrations in objects or structures which could become
evident in ways that might be annoying to humans (e.g., rattling of windows). The C -weighted decibel
scale, which was developed to estimate human ear sensitivity to high noise levels, is a flatter filter that does
not discount low frequency noise as much as the A -weighted decibel scale. As a result, a C -weighted decibel
measurement could be significantly higher than an A -weighted decibel measurement if the noise being
measured contains a heavy low frequency content.
Measurements conducted utilizing the C -weighted decibel scale are denoted with an "(C)" or "C" after the
decibel abbreviation (dB(C) or dBC). C -weighted noise level limits are sometimes included in noise
regulations as a way to address low frequency environmental noise issues.
Community Noise Equivalent Level (CNEL)
A 24 -hour A -weighted average sound level which takes into account the fact that a given level of noise may
be more or less tolerable depending on when it occurs. The CNEL measure of noise exposure weights
average hourly noise levels by 5 dB for the evening hours (between 7:00 pm and 10:00 pm), and 10 dB
between 10:00 pm and 7:00 am, then combines the results with the daytime levels to produce the final
CNEL value. It is measured in decibels, dbs.
Day -Night Average Sound Level (Ldn)
A measure of noise exposure level that is similar to CNEL except that there is no weighting applied to the
evening hours of 7:00 pm to 10:00 pm. It is measured in decibels, dB.
Glossary of Acoustical Terms
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Daytime Average Sound Level
The time -averaged A -weighted sound level measured between the hours of 7:00 am to 7:00 pm. It is
measured in decibels, dB.
Decay Rate
The time taken for the sound pressure level at a given frequency to decrease in a room. It is measured in
decibels per second, dB/s.
Decibel (dB)
The basic unit of measurement for sound level.
Direct Sound
Sound that reaches a given location in a direct line from the source without any reflections.
Divergence
The spreading of sound waves from a source in a free field, resulting in a reduction in sound pressure level
with increasing distance from the source.
Energy Basis
This refers to the procedure of summing or averaging sound pressure levels on the basis of their squared
pressures. This method involves the conversion of decibels to pressures, then performing the necessary
arithmetic calculations, and finally changing the pressure back to decibels.
Equivalent -Continuous Sound Level (Leq)
The average sound level measured over a specified time period. It is a single -number measure of time -
varying noise over a specified time period. It is the level of a steady sound that, in a stated time period and
at a stated location, has the same A -Weighted sound energy as the time -varying sound. For example, a
person who experiences an Leq of 60 dB(A) for a period of 10 minutes standing next to a busy street is
exposed to the same amount of sound energy as if he had experienced a constant noise level of 60 dB(A)
for 10 minutes rather than the time -varying traffic noise level. It is measured in decibels, dB.
Fast Response
A setting on the sound level meter that determines how sound levels are averaged over time. A fast sound
level is always more strongly influenced by recent sounds, and less influenced by sounds occurring in the
distant past, than the corresponding slow sound level. For the same non -steady sound, the maximum fast
sound level is generally greater than the corresponding maximum slow sound level. Fast response is
typically used to measure impact sound levels.
Field Impact Insulation Class (FIIC)
A single number rating similar to the impact insulation class except that the impact sound pressure levels
are measured in the field.
Glossary of Acoustical Terms
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Field Sound Transmission Class (FSTC)
A single number rating similar to sound transmission class except that the transmission loss values used to
derive this class are measured in the field.
Flanking Sound Transmission
The transmission of sound from a room in which a source is located to an adjacent receiving room by paths
other than through the common partition. Also, the diffraction of noise around the ends of a barrier.
Frequency
The number of oscillations per second of a sound wave
Hourly Average Sound Level (HNL)
The equivalent -continuous sound level, Leq, over a 1 -hour period.
Impact Insulation Class (IIC)
A single number rating used to compare the effectiveness of floor/ceiling assemblies in providing reduction
of impact -generated sound such as the sound of a person's walking across the upstairs floor.
Impact Noise
The noise that results when two objects collide.
Impulse Noise
Noise of a transient nature due to the sudden impulse of pressure like that created by a gunshot or balloon
bursting.
Insertion Loss
The decrease in sound power level measured at the location of the receiver when an element (e.g., a noise
barrier) is inserted in the transmission path between the sound source and the receiver.
Inverse Square Law
A rule by which the sound intensity varies inversely with the square of the distance from the source. This
results in a 6dB decrease in sound pressure level for each doubling of distance from the source.
Ln Percentile Sound Level
The noise level exceeded for n% of the measurement period where n is between 0.01 % and 99.99%. Usually
includes a descriptor i.e. A -weighting. Common Ln values include LA 10, LA50, and LA90 levels. LA 10
would represent the A -weighted sound level that is exceeded for 10% of the measurement period.
Masking
The process by which the threshold of hearing for one sound is raised by the presence of another sound.
Maximum Sound Level (Lmax)
The greatest sound level measured on a sound level meter during a designated time interval or event.
Glossary of Acoustical Terms
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NC Curves (Noise Criterion Curves)
A system for rating the noisiness of an occupied indoor space. An actual octave -band spectrum is compared
with a set of standard NC curves to determine the NC level of the space.
Noise Isolation Class (NIC)
A single number rating derived from the measured values of noise reduction between two enclosed spaces
that are connected by one or more partitions. Unlike STC or NNIC, this rating is not adjusted or normalized
to a measured or standard reverberation time.
Noise Reduction
The difference in sound pressure level between any two points.
Noise Reduction Coefficient (NRC)
A single number rating of the sound absorption properties of a material. It is the average of the sound
absorption coefficients at 250, 500, 1000, and 2000 Hz, rounded to the nearest multiple of 0.05.
Normalized Noise Isolation Class (NNIC)
A single number rating similar to the noise isolation class except that the measured noise reduction values
are normalized to a reverberation time of 0.5 seconds.
Octave
The frequency interval between two sounds whose frequency ratio is 2. For example, the frequency interval
between 500 Hz and 1,000 Hz is one octave.
Octave -Band Sound Level
For an octave frequency band, the sound pressure level of the sound contained within that band.
One -Third Octave
The frequency interval between two sounds whose frequency ratio is 2^(1/3). For example, the frequency
interval between 200 Hz and 250 Hz is one-third octave.
One -Third -Octave -Band Sound Level
For a one -third -octave frequency band, the sound pressure level of the sound contained within that band.
Outdoor -Indoor Transmission Class (OITC)
A single number rating used to compare the sound insulation properties of building fa�ade elements. This
rating is designed to correlate with subjective impressions of the ability of fa�ade elements to reduce the
overall loudness of ground and air transportation noise.
Peak Sound Level (Lpk)
The maximum instantaneous sound level during a stated time period or event.
Glossary of Acoustical Terms
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Behrens and Associates, Inc.
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Pink Noise
Noise that has approximately equal intensities at each octave or one -third -octave band.
Point Source
A source that radiates sound as if from a single point.
RC Curves (Room Criterion Curves)
A system for rating the noisiness of an occupied indoor space. An actual octave -band spectrum is compared
with a set of standard RC curves to determine the RC level of the space.
Real -Time Analyzer (RTA)
An instrument for the determination of a sound spectrum.
Receiver
A person (or persons) or equipment which is affected by noise.
Reflected Sound
Sound that persists in an enclosed space as a result of repeated reflections or scattering. It does not include
sound that travels directly from the source without reflections.
Reverberation
The persistence of a sound in an enclosed or partially enclosed space after the source of the sound has
stopped, due to the repeated reflection of the sound waves.
Room Absorption
The total absorption within a room due to all objects, surfaces and air absorption within the room. It is
measured in Sabins or metric Sabins.
Slow Response
A setting on the sound level meter that determines how measured sound levels are averaged over time. A
slow sound level is more influenced by sounds occurring in the distant past that the corresponding fast
sound level.
Sound
A physical disturbance in a medium (e.g., air) that is capable of being detected by the human ear.
Sound Absorption Coefficient
A measure of the sound -absorptive property of a material.
Sound Insulation
The capacity of a structure or element to prevent sound from reaching a receiver room either by absorption
or reflection.
Glossary of Acoustical Terms
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Sound Level Meter (SLM)
An instrument used for the measurement of sound level, with a standard frequency -weighting and standard
exponentially weighted time averaging.
Sound Power Level
A physical measure of the amount of power a sound source radiates into the surrounding air. It is measured
in decibels.
Sound Pressure Level
A physical measure of the magnitude of a sound. It is related to the sound's energy. The terms sound
pressure level and sound level are often used interchangeably.
Sound Transmission Class (STC)
A single number rating used to compare the sound insulation properties of walls, floors, ceilings, windows,
or doors. This rating is designed to correlate with subjective impressions of the ability of building elements
to reduce the overall loudness of speech, radio, television, and similar noise sources in offices and buildings.
Source Room
A room that contains a noise source or sources
Spectrum
The spectrum of a sound wave is a description of its resolution into components, each of different frequency
and usually different amplitude.
Tapping Machine
A device used in rating different floor constructions against impacts. It produces a series of impacts on the
floor under test, 10 times per second.
Tone
A sound with a distinct pitch
Transmission Loss (TL)
A property of a material or structure describing its ability to reduce the transmission of sound at a particular
frequency from one space to another. The higher the TL value the more effective the material or structure
is in reducing sound between two spaces. It is measured in decibels.
White Noise
Noise that has approximately equal intensities at all frequencies.
Windscreen
A porous covering for a microphone, designed to reduce the noise generated by the passage of wind over
the microphone.
Glossary of Acoustical Terms
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Appendix B Exhaust Silencer Attenuation
Exhaust Silencer Attenuation
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Table of 90011 Series Hospital Grade Exhaust Silencer Insertion Loss Values (dB)
31Hz
63Hz
125Hz
250Hz
500Hz
1kHz
2kHz
4kHz
8kHz
Insertion
Loss
21
30
42
44
40
39
36
35
32
J
W
co
U
W
C
t/1
O
J
Z
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p
W
1J1
TYPICAL ATTENUATION CURVE 900H SERIES SILENCER
OCTAVE BAND
63 125 250 500 1000 2000 4000 8000
CENTER FREQUENCY, Hz
Exhaust Silencer Attenuation
20
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