HomeMy WebLinkAbout3.0 BOCC Staff Report 03.10.2008C G)
74ppra (reoj - Y Ccs - y (4?0\.
fer'-reo'7/4/(C)
Exhibits for a Public Hearing held on March 10th, 2008 (Chevron Central Prod. Fac.)
Exhibit Letter
(A to Z)
Exhibit
A
Proof of Mail Receipts
B
Proof of Publication
C
Garfield County Zoning Resolution of 1978, as amended
D
Garfield County Comprehensive Plan of 2000
E
Application
F
Staff Report
G
Memo from Jake Mall of the Garfield County Road and Bridge Department dated
February 27, 2008
11
Memo from Steve Anthony of the Garfield County Vegetation Management
Department dated February 27, 2008
I
Letter from Dean Riggs of the Colorado Division of Wildlife, dated February 25,
2008
J
Preliminary Noise Study from Paul Kiteck of Hoover and Keith
K
Memo from Steve Anthony of the Garfield County Vegetation Management
Department dated February 28, 2008
L
Letter from Chris Hale, PE of Mountain Cross Engineering, dated February 28,
2008
M
Email from Sally Cuffin of Washington Group International dated February 29,
2008
trizotle e ras rbc Cca ra / P/a M(''tr�'J/:q
Ia
' j'C(. ✓'o(9 4 Cr ace" ;: » • co,' ` , ! PC �We-
� V V D
pA,..7 ar V�� 't/7,7 pt-
" Pc4 Kc'ej Sr' 147,,*
ca,xe,f ,y,e,-7f- 0 /-) C ?/" c r {(
�lV. -Ark.,u, gn. . I��� Ar ai
06cj /ee I V .3/7(0e
P(,ceat e,
eve ^/7 804
(
S).1 c-,7 y *,--p• 74
- so c, c sii-o !
s rr R7l(�° �` �oQ��G rl/% Cl t S pip e -4.4-r ce.
( Ccfr-t l 17(
f(47
- C �jSt'err
- C,��b
�4Sr 1 cp _/A
el
reg fa
f IC'cl'estile_
47P -C°41 - /ee4p/fe
4 °o/
/Loci,/,3(77/4___
PROJECT INFORMATION AND STAFF COMMENTS
TYPE OF REVIEW
APPLICANT/PROPERTY OWNER:
LOCATION:
SITE INFORMATION:
ACCESS:
EXISTING ZONING:
ADJACENT ZONING:
BOCC 03/10/08
DP
The Applicant requests a Special Use Permit
for an "Industrial Support Facility which would
include: material handling, pumping facilities,
staging areas, storage areas and processing"
in the RL zone district
Chevron USA, Inc.
Section 36, T5S, R98W, generally described
as a tract of land 12.5 miles north of the Town
of DeBeque off CR 211.
12 acres (54,289.29 acre total)
County Road 211
RL (Resource Lands) — GSLVF (Gentle
Slopes & Lower Valley Floor)
- RL (Resource Lands)
- OS (Open Space)
I. DESCRIPTION OF THE PROPOSAL
The Building and Planning Department received a Special Use Permit (SUP) application for an
"Industrial Support Facility which would include: material handling, pumping facilities, staging areas,
storage areas and processing" for a Central Production Facility and Temporary Storage Area on an
approximately 54,000 -acre property owned by Chevron USA, Inc. The site is located approximately
2.5 miles past the end of County Road 211 and approximately 12.5 miles north of the Town of
Debeque.
More specifically, the Applicant requests approval from the Board for a Central Production Facility
(3.3 acres) and Temporary Storage Area (1.6 acres). The Applicant has represented the facility in
the following manner:
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 2
The purpose of the Central Production Facility is to process raw natural gas coming from the well
field for delivery to regional pipelines. Gas coming from the wells contains water, which must he
removed to prevent corrosion and hydrate formation in the pipelines. A variety of separation
techniques are used to remove the excess water including physical separation and glycol
dehydration. Raw gas entering the facility is compressed and then sent through the drying
processes prior to introduction into a proposed 30 -inch pipeline. The 30 -inch pipeline connects
the facility to regional sales pipelines. The facility also will separate natural gas condensate (a
mixture of low-density hydrocarbons) from the produced water. The separated condensate will
be stored in tanks for off-site shipment. The remaining produced water stored temporarily in a
CPF tank prior to being transferred to a proposed onsite treatment system.
The project has identified the need for a general storage area to support multiple construction
projects associated with proposed facilities. A 1.4 acre area on the cast side of the CPF is
proposed for this purpose (see Drawing 2033 -240 -20 -AP -0002.01 Rev. D. The area Calls within
the safety radius of the facility flare stack, which means it will only be used until the CPF
becomes operational.
Required Production Equipment / Storage Items
The current CPF equipment list includes the following:
• Gas Separator (two phase)
• Liquid Separator (three phase)
• 3 Compressor Skids complete with:
o Compressor
o Natural Gas Engine
o Bottles
o Scrubbers
o Coolers
o Interconnect Piping (ICP)
o Programmable Logic Controller (PLC)
o Lubrication system
• Glycol Dehydration Tower
• 2 Glycol Regeneration Skids
• Volatile Organic Compound Recovery Skid for Glycol Dehydration System
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 3
• Water Surge Tank & Transfer Pumps
• Condensate Settling Tank
• Produced Water Tank
• 6 Condensate Tanks
• Flare Scruhber / Pump Skid
• Flare Stack
• 2 Gas Pipeline Scrapper (Pig) Receivers - Gathering Line Cleaner
• 2 Liquid Pipeline Scrapper (Pig) Receiver - Gathering Line Cleaner
• Chemical Injection Points
• Emergency Shutdown / Fire & Gas System (ESD! F&G)
• Vapor Recovery Unit Skid for Off -Gas Recovery
• Instrument Air Compressor Skid
• Power Generation / Distribution
• Compressor Building (53 ft x 154.3 ft)
• Instrument Air Building (20 fl x 20 ft)
• Power House Building (Electrical, Instrumentation & Controls, Warehouse) (16 ft x 65
ft)
• Programmable Logic Controllers & Infield Ethernet Ring
• Associate Piping and Control Cables
II. BACKGROUND
Chevron USA Inc. is now underway with their gas extraction operations north of the Town of
DeBeque. Chevron USA Inc. owns over 100,000 acres within Garfield County and this particular
parcel is approximately 54,000 acres. Chevron USA Inc. is currently operating several natural gas
drill rigs in the area and has obtained approval for multiple Temporary Employee Housing facilities,
pipelines and temporary office facilities, among others on the subject property.
Referral to Planning Commission
The BOCC voted 3-0 not to refer this application to the Planning Commission on January 14, 2008
for the following reasons: 1) the limited nature of potential impacts to surrounding properties, 2) the
remote location of the property such that it is situated at the end of a dead-end county road which is
used primarily for industrial traffic serving the existing industrial uses in the area with very limited
general population traffic.
III. SITE DESCRIPTION
The proposed site where the Central Production Facility (CPF) and Temporary Storage Area are to
be located is situated on stream river basin land that is situated at the general confluence of Tom
Creek and Clear Creek. The CPF site is proposed to be located on approximately 4.8 acres (12
acres of disturbance) of the total 54,000 acre parcel owned by Chevron USA Inc. The area where
the CPF is to be located is surrounded by steep slopes and canyons forming the confluence of the
two creeks. Dense mature riparian vegetation exists along the creeks as they pass through the area.
There is an old cabin on the property (See photos below) which is to be relocated to the Town of
DeBeque.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 4
General Site Location within Garfield County
Central Production Facility
Pointer 39°34'3280" 11 105'20'44,07' W oleo 681011
ilea go
Stream
Google .,
Eye alt 119161t
Aerial View of Proposed CPF Site
Chevron USA Inc. - Central Production Facility
BOCC - 03/10/2008
Page 5
■ sIMIR 111111M risszlip
I Subject Site ,iIitpi
1.6211111111129/ ra 11 Ming
r rostrepan
ratipparoratilil
1 111 1; rdli V:elinik
3 1 rrittlifiati El
;191 iza ff'iI�;�.
tramst; ��t�w.l�� r ';;''fir �,�lwl ' aipTiril .;:";
lf
..���al�is€we maySPIV ItisairldzilleMEMIUMEtarmilradamsElmelliNtratirallINIEffigts ? Wareji, werivaLtin i "SA..ttaarm...1.5a Pleala
sr
Nwc4 is
0
Clersaan
igetrami
Isaaanuor
Pita aratni
9 Pau*
Chevron -
Central Production Facility
0 2,000 4,000 8,000 Feet
1 1 1 i i
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 6
Right: View of CPF Site looking SE
Right: View of CPF Site looking NW
Right: View of CPF Site looking NE
(Small cabin to berelocated to DeBeque.
Access road to be relocated to the north where
cabin is currently located).
Chevron USA Inc. — Central Production Facility
BOCC— 03/10/2008
Page 7
Right: View of CPF Site looking NW
(Access road to be relocated to the north).
Right: View of CPF Site looking E
(Access road to be relocated to the north).
IV. ZONING & ADJACENT USES
The subject property is zoned Resource Lands (Gentle Slopes and Lower Valley Floor). The type of
use requested falls under the definition of an "Industrial Support Facility which would include:
material handling, pumping facilities, staging areas, storage areas and processing" which are
contemplated as special uses in the Resource Lands (Gentle Slopes and Lower Valley Floor) zone
district.
The CPF and temporary storage area are to be located on 4.8 acres (12 acres of disturbance) of an
approximately 54,000 acre property which is surrounded by properties also owned and utilized by
the energy industry such as EnCana, Shell, Oxy, Berry Petroleum Company, Kerogen Oil Company,
Puckett Land Company, ExxonMobil, etc. Other neighboring land owners include the Colorado
Nature Ranch, the BLM, EV Ranch, and the State of Colorado. Neighboring uses on those lands
include rangeland grazing, farming, and resource extraction (natural gas drilling).
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 8
V. AUTHORITY & APPLICABILITY
Pursuant to Section 9.03.04 of the Zoning Resolution, an application for a Special Use Permit shall
be approved or denied by the Board of County Commissioners after holding a public hearing
thereon in conformance with all provisions of the Zoning Resolution.
VI. REVIEW AGENCY AND OTHER COMMENTS
Comments have been received from the following agencies / community groups and are integrated
throughout this memorandum as applicable.
1. Town of DeBeque:
2. Mesa County Planning Department:
3. Colorado Division of Wildlife:
4. Colorado Department of Public Health and Environment:
5. Bureau of Land Management:
6. Garfield County Road and Bridge Department:
7. Garfield County Vegetation Management:
8. Garfield County Oil and Gas Auditor:
9. Mountain Cross Engineering:
No Comments Received
No Comments Received
See Exhibit I
No Comments Received
No Comments Received
See Exhibit G
See Exhibit H
No Comments Received
See Exhibit L
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 9
�
F
\
$g
\SpR
yYn4
„cl..kateii \
\\
t/l!
E
r\\(
?
Li
i4
g
Lfl`
lF
II
4£
!I:
Ill
J
2
1.
I
\
o&en
tips
a -/
Oil IC
Oi[ —a
`er
d.
It
Q_
II
's
ILJSS
E
p L
ag` 0`
E
'u
u
if
2
'E
\!» K
L\I:
1E
16
Proposed Site Plan
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 10
VII. REVIEW CRITERIA FOR SPECIAL USE PERMITS (SECTION 5:03)
Pursuant to Section 5.03, as listed under the Zone District Regulations, special uses shall conform
to all requirements listed there under and elsewhere in the Zoning Resolution, as well as the
following standards:
1. Utilities adequate to provide water and sanitation service based on accepted
engineering standards and approved by the Board of County Commissioners shall either be
in place or shall be constructed in conjunction with the proposed use.
Response
The Applicant is proposing occupancy of approximately 20 people using the offices identified within
the temporary lay down area (Staging Area) followed by occupancy of up to 10 people in the
permanent control building for the Central Production Facility. Initially, the temporary construction
and office trailers are to be served by hauled potable water and a vault -and -haul sewage disposal
system for the initial 20 workers and potentially up to 75 workers during the peak points of
construction. During this time, Chevron is to develop and construct the permanent Central
Production Facility which is expected to take 6 to 8 months and will include an ISDS capable of
supporting up to 10 employees. Water is to be initially supplied with hauled potable water for the
initial 6 to 8 months of construction (20 to 75 employees) and the Applicant has supplied an affidavit
from Down Valley Septic for this service. During the time of construction, the Applicant has indicated
that the number of employees at the site could reach 75 for a very short period. At the time the flare
is operational, the control building has obtained the necessary Building Permits and the ISDS is
installed, the office trailers are to be removed from the Flare Safety Zone (aka Laydown Area or
Staging Area) along with the portable vault -and -haul sewage tanks and potable water tanks. In
summary, the Applicant is requesting temporary facilities for the office/construction trailers within the
lay down area (Staging Area) until the permanent control building and ISDS are constructed and the
flare is operational. At the time the flare is operational all equipment must be removed from the flare
safety zone (See Site Plan on previous page).
To this end, the Applicant is proposing the following methods of water and sanitation service to the
facilities:
Temporary Lay Down Area (Staging Area) — First 6 to 8 Months (Until Flare is Operational)
Potable Water
2 - 3,025 gallon potable water storage tanks (Total capacity of 6,050 gallons).
Water service is to be provided by Down Valley Septic, who purchases water from the Town
of Silt.
Water tanks are to be refilled a minimum of every three (3) days.
With 20 employees at the site, this storage is expected to provide approximately 100 gallons
of water per day per employee.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 11
- With 75 employees at the site, this storage is expected to provide approximately 27 gallons
of water per day per employee.
Wastewater Disposal
2 — 4,030 gallon wastewater storage tanks (Total capacity of 8,060 gallons).
Wastewater disposal service to be provided by Down Valley Septic, who disposes of waste
at the South Canyon Landfill.
Wastewater tanks are to be emptied a minimum of every three (3) days.
According to CDPHE, Water Quality Control Division, Guidelines for Individual Sewage
Disposal Systems recommends capacity of 15 gallons/person/day/8-hour shift.
Assuming there are 20 employees at the site each working 5 — 8 hour shifts per week, the
proposed 8060 gallon capacity of wastewater is expected to be an approximately 26 day
supply of storage.
Assuming there are 75 employees at the site each working 5 — 8 hour shifts per week, the
proposed 8060 gallon capacity of wastewater is expected to be an approximately 7 day
supply of storage.
Permanent Control Building
Potable Water
Water is to be stored in a Cistern/Water Storage Container
Water service is to be provided by Down Valley Septic, who purchases water from the Town
of Silt.
Staff understands that the Applicant is working to obtain a well permit for the subject
property. Staff recommends that the Applicant obtain an approved well permit prior to
issuance of the Special Use Permit.
The proposed water tank is to be 3,025 gallons.
Water tanks are to be refilled a minimum of every three (3) days.
With 10 employees at the site, this storage is expected to provide approximately 100 gallons
of water per day per employee.
Wastewater Disposal
The Applicant is proposing to install an ISDS capable of handling a capacity of 10
employees.
The Applicant will need to obtain an ISDS permit from Garfield County prior to installation of
this system.
In summary, Staff finds that the proposed water supply and wastewater disposal methods are
adequate as long as a condition is placed on the Special Use Permit requiring that the Applicant
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 12
submit an approved and adequate well permit to serve the permanent control building prior to
issuance of the Special Use Permit.
2. Street improvements adequate to accommodate traffic volume generated by the
proposed use and to provide safe, convenient access to the use shall either be in place or
shall be constructed in conjunction with the proposed use.
Response
The Applicant has represented the following regarding traffic to and from the site:
Initial traffic associated with the CPF construction will include the delivery and transfer of
earthmoving equipment (e.g_, graders, backhoes, loaders) and construction materials (e.g.,
concrete, gravel, storm -water controls) plus the associated workers. Additional deliveries /
installations will be required for the compressors, separators, vapor recovery unit, glycol
dehydration & regeneration suds, volatile organic compound recovery skid, tanks, piping, valves,
generators, controllers, instrumentation, control electrical & instrumentation/warehouse
buildings, and communication equipment_
Vehicles required for the construction will range from heavy duty pickup trucks to oversized
vehicles for transporting equipment such as the tasks and compressors. The majority of the
traffic will be sized to meet posted weight restrictions but a number of heavy and wide loads will
be required to place major equipment (e.g., compressors, generators, etc_). An estimated 75
vehicles will be required to deliver construction and site equipment with an additional 150
vehicles for construction materials and 75 vehicles for concrete delivery (may be larger number
depending on compressor foundation design). The construction is expected to take about six
months (up to eight depending on weather delays) requiring a workforce of between 75 and 150
employees. Efforts will be made to reduce workforce vehicle trips by the use of carpooling, vans,
and / or buses.
Start-up operations will begin at the completion of the C2Pt' construction. Start up will involve
bringing the systems on line and ensuring that all mechanical / electrical / control &
instrumentation systems are operational and properly interface. About 30 employees will be
required for start-up operations, but they will divide their time between the CPF and other field
systems (e.g., well pad equipment). All equipment and structures will be removed from the
temporary storage area prior to start-up operations_
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 13
Following start up about 4 or 5 individuals will be required for normal operations. These
personnel will perform regular system checks, routine maintenance, and coordinate condensate
transport. The CPF will not be manned on a continuous basis. Associated personnel will rotate
• throughout the project area performing multiple operations.
Additional traffic associated with the CPF will include subcontractors providing wastewater
servicing, supplying bottled water, and providing trash collection. The number of trips required
for these services will be dependent on the capacity of Down Valley Septic but the site will be
serviced at least twice a week.
All vehicles working within Garfield County Right of Ways will be licensed and registered in the
State of Colorado. Vehicles hauling equipment and materials will abide by Garfield County Road
and Bridge Departments oversize / overweight regulations. All oversize / overweight vehicles
will obtain the necessary permits and carry a letter showing proof that they can operate under a
known bond holder on file with Garfield and Mesa County Road and Bridge Departments.
The road to the Central Production Facility site is an existing road that meets the County's
standards. Staff understands that Garfield County is in negotiations with Chevron USA Inc. to
improve County Road 211 and portions of County Road 204. All of the roads past Hiner Gate are
private roads owned and maintained by Chevron USA, Inc.
The Applicant has indicated that Chevron USA, Inc. has contracted with Hyland Enterprises, Inc. to
maintain the internal roads and to supplement the County's maintenance of County Road 211
through the winter months. Chevron USA Inc. also contracted with Ken Small Industries to
supplement Hyland's services.
Further, this application has been reviewed by the Garfield County Road and Bridge Department
who have made the following comments (See Exhibit G):
Garfield County Road & Bridge Department has no objections to this application
with the following comments. As this in on private land with a permitted driveway
access to the property no further requirements to meet the driveway access permit is
necessary. All vehicles hauling equipment and materials for the building of the
facility will abide by Garfield Counties oversize/overweight system. Vehicles
requiring oversize/overweight permits operating under Chevrons bond will have a
letter on file with Garfield County Road & Bridge Department prior to the issuing of
any permits. As Chevron has already committed to road repair and road maintenance
no further commitment is required from them for the roads they will be using.
To this end, it is Staff's opinion that the roads to the facility are adequate and that no further
improvements associated with this application are necessary.
3. Design of the proposed use is organized to minimize impact on and from adjacent
uses of land through installation of screen fences orlandscape materials on the periphery of
the lot and by location of intensively utilized areas, access points, lighting and signs in such
a manner as to protect established neighborhood character.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 14
Response
The property is located in an extremely secluded portion of the property which is practically
screened by adjacent steep topography and is located several miles from the nearest residence
(see maps and photos on previous pages). It cannot be seen from CR 204 or CR 211. As noted
earlier, the proposed use will have relatively limited impact to surrounding properties. It is situated in
a remote private location on the property such that it is situated at the end of a dead-end county
road which is used primarily for industrial traffic serving the existing industrial uses in the area with
very limited general population traffic. Further, the site itself is situated in an industrial area already
characterized by increasingly intense industrial activity from the gas industry as well as previous oil
shale exploration activities. No screening is necessary as it is already screened by steep
topography. In accordance with the Garfield County Industrial Standards, the "lighting of the storage
area shall be pointed downward and inward to the property center and shaded to prevent direct
reflection on adjacent property". The Applicant plans to paint all the equipment in accordance with
the Bureau of Land Management (BLM) Gold Book standards in order to better blend in with the
surrounding environment. The Applicant has made the following representation regarding the
visibility of this site:
The CPF is located in a remote region of Garfield County and will have 110 visual effects on
adjacent landowners. Visual effects include the physical presence of the facility, building
lighting, and operational traffic. Outdoor lighting will be positioned downward to ntitimi7e
lighting the canyon walls. Additional mitigation measures identified by the Chevron ES}UA
process will be implemented as determined by project management. Facilities will be painted in
accordance with best management practices such as those recommended in the Bureau of Land
Management (BLI'vf) Gold Book.
To this end, it is Staff's opinion that the topography of the area sufficiently screens this facility from
adjacent uses and public rights-of-way. Staff recommends a condition of approval that all equipment
be painted in accordance with the BLM Gold Book standards.
Section 5.03.07 !Industrial Operationsj
Pursuant to Section 5.03.07 of the Zoning Resolution, a permit for Industrial Operations requires the
submittal of an impact statement on the proposed use describing its location, scope, design and
construction schedule, including an explanation of its operational characteristics. The impact
statement is required to address the following:
(A) Existing lawful use of water through depletion or pollution of surface run-off, stream
flow or ground water.
Response
The facility site has been designed to insure protection of ground water and nearby streams through
the development and implementation of a Storm Water Management Plan for the general Skinner
Ridge area. Further, containment facilities are designed into the facility for any hazardous material
stored or used during operations. Staff recommends a Condition of Approval that all construction
and operation of the site occur in accordance with the Storm Water Management Plan as submitted.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 15
The Applicant has also submitted a Certification to Discharge — Stormwater Discharges Associated
with Construction for "Tom Creek in the Skinner Ridge Area". This permit is for a total disturbance of
18 acres and expires in 2012.
A Spill Prevention, Control, and Countermeasure Plan (SPCC) has been submitted. This plan is
general to the "Picaence Basin Field" for Chevron USA, Inc. and is dated 2004. Staff recommends a
Condition of Approval that all construction and operation of the site occur in accordance with the
SPCC.
The Applicant has conducted a floodplain study for the "Picaence Basin Development — Central
Production Facility". The study concludes that the Central Production Facility as proposed is not
within the 100 -year floodplain. In addition, the study recommends that rip -rap slope protection be
provided along the embankments adjacent to the floodplain limits to prevent erosion on the
embankment slopes. Staff recommends that this be added as a Condition of Approval.
All vault -and -haul wastewater storage containers and ISDS's will need to obtain an ISDS permit
from the Garfield County Building Department prior to installation.
(B) Impacts on adjacent land from the generation of vapor, dust, smoke, noise, glare or
vibration, or other emanations.
Response
Compressors and other equipment at this facility will produce considerable volumes of noise and
vibration but whose acceptable levels are regulated by the Colorado Revised Statutes. The
Applicant has submitted a preliminary noise study (see Exhibit J) which predicts that the noise
generated on the subject site is anticipated to comply with State Statute. However, staff
recommends that as a condition of approval, the Applicant be required to submit a final noise study
for the proposed facility which indicates that the facility will not cause noise levels which exceed the
state statute. If the facility does undermine the State statutes regarding noise generation, the
applicant will need to submit a plan for mitigating this noise. If this plan requires amendments to the
submitted and approved Special Use Permit, however, it is possible that the Applicant will need to
submit for a new Special Use Permit for this facility if the mitigation measures require changes to the
approved plan. Generally, it is Staffs opinion that noise generated will have very little impact on
adjacent properties since the compressor is located in a canyon -like area that will prevent any sound
from traveling as well as being located well within the boundaries of the subject property far from
adjacent properties. In any event, Chevron USA, Inc. shall adhere to the noise standards specified
by the Colorado Revised Statutes and the Colorado Oil and Gas Conservation Commission rules.
As power to the facility is to initially be provided by on-site diesel generators, the facility will produce
diesel fumes. In addition, the facility will generate fumes from the flare. The Applicant has
represented the following information regarding these installations:
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 16
1.7.4 Flare
An important component of the CPF is the flare system, which is located about 200 feet from the
facility (see Drawing 2033 -240 -20 -AP -0002-01, Rev. L). Flaring will be required during start-up
operations and potentially into early production. Almost continuous flaring may be required for
the first three months and intermittent flaring may be required for up to a year. However, flaring
operations will be kept to a minimum because of lost revenue.
Because no equipment is 100 -percent efficient, a small amount of hydrocarbons will need to be
vented from the system on a continuing basis (no visible flame) The flare system also is
designed to handle emergency situations when an equipment failure or other system upset results
in an over -pressurization of the system In these situations larger quantities of gas will be vented
and flared until corrective action can be taken. The 200 -ft safety radius is provided around the
flare to protect personnel and equipment from radiant heat during one of these upset situations.
The flare operation will conform to all appropriate federal and state regulatory requirements.
There will be no visible flames or emissions from the flare system during normal operations.
L9 Electrical Utilities / Regulatory Requirements
Grand Valley Power is currently working to provide 5 MW of service to the facilities in Clear
Creek valley, but initial operations will require the use of on-site power generation. Operational
power will initially be provided the generators described in Section 1.75 These units will be
used until a new Grand Valley Power line is routed to the site. Initial plans are to upgrade power
to the Clear Creek basin to 5 MW with ultimate plans to upgrade the system to 240 MW service.
Grand Valley Power is currently scheduling the 5 MW upgrade for some time 2008 or early 2009_
A 2,000 gallon diesel fuel tank will be used to supply fuel to the onsite generators. The tank
installation will comply with the Oil Pollution Prevention regulations (40 CFR 112) of the Clean
Water Act, National Fire Prevention Association guidance, and International Fire Code
regulations. Information about this tank will be incorporated into the site SPCC plan (see SPCC
attachment) during the next review cycle (October, 2007). The tank installations shall be in
accordance with manufacturer and SPCC plan specifications, local fire codes, National Fire
Protection Association requirements, and International Fire Code. A copy of the site SPCC plan
will be available to the De Beque fire chief for review_
The Synthetic Minor permit application submitted to CDPHE on May 1, 2007, included
emissions from these generators. Copies of the penult approval notifications will be provided to
the County when the CDPHE review has been completed.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 17
Staff understands that the Synthetic Minor permit for emissions from the generators was submitted
to CDPHE on May 1, 2007. However, this permit has not been issued to date. The Applicant has
requested that the Special Use Permit be issued so that construction can begin without CDPHE
issuing this permit. The Applicant understands that this permit will need to be obtained from CDPHE
prior to starting any equipment which is governed by this permit. Staff suggests that if the BOCC is
amenable to this request that a limited time frame of six (6) months from the date of issuance of the
Special Use Permit be added as a condition of approval to allow for Chevron USA Inc. to obtain and
be approved for this permit from CDPHE. If Chevron USA, Inc. fails to either obtain a permit within
the specified timeframe or if the permit is denied by CDPHE, the approved Special Use Permit from
Garfield County become null and void. At this point, Chevron USA, Inc. will need to reapply for a
new Special Use Permit from Garfield County for this facility.
The Applicant is proposing to layer the surface of the site with 6 -inches of 1 -inch gravel to create an
all weather surface. Staff recommends that as a condition of approval, the Applicant agree to treat
this surface periodically with an approved dust suppressant to control fugitive dust.
To this end, it is Staffs opinion that considering the topography of the area in conjunction with the
distances between the proposed site and existing residences, that the impacts to adjacent property
owners is limited to diffuse airborne contaminants associated with the combustion of diesel fuel,
gasoline and natural gas (flare).
(C) Impacts on wildlife and domestic animals through the creation of hazardous
attractions, alteration of existing native vegetation, blockade of migration routes, use
patterns or other disruptions.
Response
The proposed site where the Central Production Facility (CPF) and Temporary Storage Area are
proposed to be located is situated on stream river basin land that is situated at the general
confluence of Tom Creek and Clear Creek. The CPF site is proposed to be located on
approximately 12 acres (plus 0.2 acres of disturbance for the relocation of the access road) of the
total 54,000 acre parcel owned by Chevron USA Inc. The area where the CPF is to be located is
surrounded by steep slopes and canyons forming the confluence of the two creeks. Dense mature
riparian vegetation exists along the creeks as they pass through the area.
The Applicant has submitted an "Integrated Vegetation and Noxious Weed Management Plan" for
the Chevron Clear Creek 8 inch pipeline which was conducted in December2006. Steve Anthony of
Garfield County Vegetation Management had the following comments regarding vegetation and
weed management for this site (See Exhibit H):
Thanks for the opportunity to comment on this project. My comments are as follows:
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 18
Integrated Vegetation and Weed Management
• The submitted vegetation and weed management plan is for an area outside of the
project site. Staff requests that the applicant submit a plan for the project area. This
includes weed inventory, weed management, and revegetation.
• Before leaving the site, all off road major construction equipment (graders, dozers, etc)
working in areas of mapped noxious weeds should be power washed to remove seeds,
soil, and vegetative matter.
• The comments below are excerpted from a memo from Vegetation Management staff to
Building and Planning regarding the Piceance Gathering Pipeline Project (July20, 2007):
The noxious weed, tamarisk, is located in within 200 feet of the pipeline
in many points along the pipeline. The applicant shall cut and treat the
tamarisk prior to construction activities.
Please forward a copy of the application records to the below address.
Garfield County Vegetation Management
POB 426
Rifle CO 81650
To date, this office has not received records indicating that the tamarisk
work was done.
Reclamation
The applicant has quantified the surface area to be disturbed and subsequently reseeded.
Temporary office area
= 1.4 acres
Production facility (including road) = 3.5 acres
The recommended security for the office area is $3500 (1.4 acres x $2500/acre).
The recommended security for the production facility acre is $14,000 (3.5 acres x
$4000/acre).
Since the production facility may be in place for 20 years or longer the per acre rate is higher.
These securities should be done separately since the time frame for security release is in the
short term for the temporary office area.
The applicant shall provide the Vegetation Management Department with the original tags
from each seed bag. The seed mix in the Plan shall match the seed mix used in the field.
Do not use a seed mix containing yellow sweet clover (Melilotus offcinalis) or annual yellow
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 19
sweetclover (M. indicus). The amount of seed specified to be planted in the Plan shall match
the quantity of seed used in the field.
The security shall be held by Garfield County until vegetation has been successfully
reestablished according to the Reclamation Standards in the Garfield County Weed
Management Plan. It is the responsibility of the applicant to contact the County, upon
successful revegetation establishment, to request an inspection for security release
consideration.
Erosion control
Any straw or hay bales used in erosion control shall be certified weed free.
In addition, the Applicant has also submitted a biological inventory which is in relation to the 6.25
mile long 8 -inch pipeline running parallel to County Road 211. In addition, the Applicant has
submitted a "Clear Creek Biological Survey". This survey does include the subject property. It
appears that items of significant biological interest near the site are an active American Kestral nest
and a probable Accipiter nest.
Further, the Applicant has made the following representations related to impacts on wildlife and
domestic animals through the creation of hazardous attractions, alteration of existing native
vegetation, blockade of migration routes, use patterns or other disruptions.
Available topsoil will be stockpiled and stabilized for the eventual site reclamation in accordance
with specific SWMP requirements. Seed mixes used for site stabilization and revegetation will
be in compliance with Garfield County Reclamation Standards. The stockpile will be monitored
and controlled for noxious weeds throughout the operation of the CPF. General information
concerning the area reclamation plan for the area is provided iii Section 8.4.
8.4 Reclamation and Revegetation Plan
Operations at the CPF are expected to continue throughout the duration of the project. When the
gas field is depleted the CPF equipment, gravel pad, and foundations will be removed. The area
then will be graded to the original contours, stockpiled topsoil will be replaced, and the area will
be planted with native vegetation. Reclamation and revegetation activities will be in accordance
with requirements outlined in Garfield County Zoning Resolution 5.02.21 (11). General details
of the re -vegetation activities are provided in the IVNWM Plan and Storm Water Management
Plan (SWMP) and will be included in the final revegetation plan.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 20
A recently completed study has identified portions of CR 204 to be a wildlife corridor for mole
deer. Vehicle traffic to and from the site will affect these populations, but mitigation treasures
are currently being studied and evaluated. Mitigation recommendations will be provided to
project management, who will evaluate the alternatives and implement appropriate measures.
A bond for the site reclamation after the cessation of activities will be provided as an addendum
to this application upon detenuutation of the total site disturbance_
In accordance with the comments received from Steve Anthony of Garfield County Vegetation
Management, Staff recommends that a condition of approval be added to the Special Use Permit
requiring that the Applicant submit a new Integrated Vegetation and Weed Management plan which
incorporates that area which is to be disturbed by the proposed Central Production Facility. This
plan shall be reviewed and deemed adequate by the Garfield County Vegetation Management
Department prior to issuance of the Special Use Permit. In addition, in order to maintain the validity
of the plan, the site shall not be graded or otherwise disturbed prior review and acceptance of the
plan by the Vegetation Management Department. Staff requests this document no later than June 1,
2008.
Further, Staff recommends that a revegetation and rehabilitation security be put in place for 1) the
area to be disturbed for the placement of the temporary office and staging area (1.6 acres) and
general construction disturbance (5.6 acres) which shall be in place for up to one year from the date
of issuance of the Special Use Permit ($21,750); and 2) the area to be disturbed for the Central
Production Facility (3.3 acres) which shall be in place for at least a 20 year timeframe ($13,200).
Further, this revegetation security shall be subject to the comments as submitted by the Garfield
County Vegetation Management Department (Exhibit H) and clarification on acreages in Exhibit M.
This Application was also referred to and reviewed by Dean Riggs of the Colorado Division of
Wildlife (CDOW) who provided extensive comments. Below are excerpts of the comments which are
particularly relevant to this application (See Exhibit I):
The proposed CPP and the assoetated temporarystorage area locations lie in an area where native
vegetation provides'foragmg,.nesting, Thermal and escape habitatsfor_riumerousspeciesofwtidltfe. The
removal and disturbiuiee of native vegetation fbr tine constntctiion of the CPP, temporary.storage area and
associated roads Will negatively impact the native wildlife species associated with this project area.
Upon rehabilitation of this location and roads, negative impacts to native wildlife can be offset by
planting a suitable mixture of native grass/forb/ahrub seed. Seed plantings on disturbed soils will have
greater germination and survival rates when the soil surface has been prepared to hold moisture and
runoff precipitation. Soils will exhibit increased moisture retention capabilities when the soil surface has
been loosened with a "ripping toot" that creates a rough and uneven soil surface and seed bed. This
treatment will increase seed germination, and, will reduce the amount of surface runoff and soil erosion.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 21
Roads
Bears
The Division of Wildlife notes and supports that minimal new roads are proposed with this new
development. Minimizing the number of roads will benefit wildlife, as building of multiple roads in an
area increases fragmentation of habitat, inhibits the natural movement of wildlife across the landscape,
increases mad -kill mortality, and broadens the opportunity for poaching. Minimizing roads and road use
will also decrease fugitive dust, which can become severe during dry summer months. The Division of
Wildlife recommends that Chevron strictly enforce speed limits on new and existing roads, and employ
dust control measures as needed.
The proposed CFF and the associated temporary storage area locations lie within year-round black bear
habitat fncreased human use of the proposed development area may increase the potential for conflicts
with black bears during the summer and early fall, particularly during years of drought. The potential for
human/bear conflicts within this project area would be greatly reduced by placing and utilizing "bear
proof" trash containers at worksite/camping locations. These trash containers should be emptied weekly
at a minimum. The Division of Wildlife has information on the design and purchase of"bear proof' trash
containers, and, will provide this information to anyone who is interested in preventing conflicts with
bears.
To this end, Staff makes the following recommendations based on the comments submitted by the
Colorado Division of Wildlife:
1. Staff recommends that a "ripping" process for the soil be incorporated into the revegetation and
rehabilitation plan.
2. Staff recommends that a condition of approval be added requiring that all solid waste be handled
within a wild -life proof refuse container which is emptied at least once per week.
3. Staff recommends that a condition of approval be added requiring that the gravel surface within
the CPF be periodically treated with an approved dust suppressant when needed.
(D) Affirmatively show the impacts of truck and automobile traffic to and from such uses
and their impacts to areas in the County.
Response
The Applicant has represented the following regarding traffic to and from the site:
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 22
Initial traffic associated with the CPF construction will include the delivery and transfer of
earthmoving equipment (e.g., graders, back -hoes, loaders) and construction materials (e.g.,
concrete, gravel, storm -water controls) plus the associated workers. Additional deliveries t
installations will be required for the compressors, separators, vapor recovery unit, glycol
dehydration & regeneration skids, volatile organic compound recovery skid, tanks, piping, calves,
generators; controllers, instrumentation control / electrical & iastnunentation / warehouse
buildings, and communication equipment.
Vehicles required for the construction will range from heavy duty pickup trucks to oversized
vehicles for transporting equipment such as the tanks and compressors. The majority of the
traffic will be sized to meet posted weight restrictions but a number of heavy and wide loads will
be required to place major equipment (e.g., compressors, generators, etc.). An estimated 75
vehicles will be required to deliver construction and site equipment with an additional 150
vehicles for construction materials and 75 vehicles for concrete delivery (may be larger number
depending on compressor foundation design). The constriction is expected to take about six
months (up to eight depending on weather delays) requiring a workforce of between 75 and 150
employees. Efforts will be made to reduce workforce vehicle trips by the use of carpooling, vans,
and / or buses.
Start-up operations will begin at the completion of the CPF construction. Startup will involve
bringing the systems on line and ensuring that all mechanical / electrical / control &
instrumentation systems are operational and properly interface. About 30 employees will be
required for start-up operations, but they will divide their time between the CPF and other field
systems (e. g., well pad equipment). All equipment and structures will be removed from the
temporary storage area prior to start-up operations.
Following start up about 4 or 5 individuals will be required for normal operations. These
personnel will perform regular system checks, routine maintenance, and coordinate condensate
transport. The CPF will not be maimed on a continuous basis. Associated personnel will rotate
throughout the project area performing multiple operations.
Additional traffic associated with the CPF will include subcontractors providing wastewater
servicing, supplying bottled water, and providing trash collection. The number of trips required
for these services will be dependent on the capacity of Down Valley Septic but the site will be
serviced at least twice a week.
All vehicles working within Garfield County Right of Ways will be licensed and registered in the
State of Colorado. Vehicles hauling equipment and materials will abide by Garfield County Road
and Bridge Departments oversize / overweight regulations. All oversize / overweight vehicles
will obtain the necessary permits and carry a letter showing proof that they can operate under a
known bond holder on file with Garfield and Mesa County Road and Bridge Departments.
The road to the Central Production Facility site is an existing road that meets the County's
standards. Staff understands that Garfield County is in negotiations with Chevron USA Inc. to
improve County Road 211 and portions of County Road 204. All of the roads past Hiner Gate are
private roads owned and maintained by Chevron USA, Inc.
The Applicant has indicated that Chevron USA, Inc. has contracted with Hyland Enterprises, Inc. to
maintain the internal roads and to supplement the County's maintenance of County Road 211
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 23
through the winter months. Chevron USA Inc. also contracted with Ken Small Industries to
supplement Hyland's services
Further, this application has been reviewed by the Garfield County Road and Bridge Department
who have made the following comments (See Exhibit G):
Garfield County Road & Bridge Department has no objections to this application
with the following comments. As this in on private land with a permitted driveway
access to the property no further requirements to meet the driveway access permit is
necessary. All vehicles hauling equipment and materials for the building of the
facility will abide by Garfield Counties oversize/overweight system. Vehicles
requiring oversize/overweight permits operating under Chevrons bond will have a
letter on file with Garfield County Road & Bridge Department prior to the issuing of
any permits. As Chevron has already committed to road repair and road maintenance
no further commitment is required from them for the roads they will be using.
To this end, it is Staff's opinion that the roads to the facility are adequate and that no further
improvements associated with this application are necessary.
(E) That sufficient distances shall separate such use from abutting property which might
otherwise be damaged by operations of the proposed use(s).
Response
The proposed site where the Central Production Facility (CPF) and Temporary Storage Area are
proposed to be located is situated on stream river basin land that is situated at the general
confluence of Tom Creek and Clear Creek. The CPF site is proposed to be located on
approximately 4.8 acres (12 acres of disturbance) of the total 54,000 acre parcel owned by Chevron
USA Inc. The area where the CPF is to be located is surrounded by steep slopes and canyons
forming the general confluence of the two creeks. The nearest residence to the proposed site is
approximately 6 miles away. Dense mature riparian vegetation exists along the creeks as they pass
through the area. There is an old cabin on the property which is to be relocated to the Town of
DeBeque.
The CPF and temporary storage area are to be located on 4.8 acres of an approximately 54,000
acre property which is surrounded by properties also owned and utilized by the energy industry such
as EnCana, Shell, Oxy, Berry Petroleum Company, Kerogen Oil Company, Puckett Land Company,
ExxonMobil, etc. Other neighboring land owners include the Colorado Nature Ranch, the BLM, EV
Ranch, and the State of Colorado. Neighboring uses on those lands include rangeland grazing,
farming, and resource extraction (natural gas drilling).
To this end, it is Staffs opinion that considering the topography of the area in conjunction with the
distances between the proposed site and existing residences, that the impacts to adjacent property
owners is limited to diffuse airborne contaminants associated with the combustion of diesel fuel,
gasoline and natural gas (flare).
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 24
(F) Mitigation measures proposed for all of the foregoing impacts identified and for the
standards identified in Section 5.03.08 of this Resolution
Special Use Permits may be granted for those uses with provisions that provide adequate mitigation
for the following:
Visual Mitigation: Staff recommends a condition of approval that all equipment be painted in
accordance with the BLM Gold Book standards.
Dust: Staff recommends that as a condition of approval, the Applicant agree to treat this
surface periodically with an approved dust suppressant to control fugitive dust.
Air Pollution: Staff understands that the Synthetic Minor permit for emissions from the
generators was submitted to CDPHE on May 1, 2007. However, this permit has not been
issued to date. The Applicant has requested that the Special Use Permit be issued so that
construction can begin without CDPHE issuing this permit. The Applicant understands that
this permit will need to be obtained from CDPHE prior to starting any equipment which is
governed by this permit. Staff suggests that if the BOCC is amenable to this request that a
limited time frame of six (6) months from the date of issuance of the Special Use Permit be
added as a condition of approval to allow for Chevron USA Inc. to obtain and be approved
for this permit from CDPHE. If Chevron USA, Inc. fails to either obtain a permit within the
specified timeframe or if the permit is denied by CDPHE, the approved Special Use Permit
from Garfield County become null and void. At this point, Chevron USA, Inc. will need to
reapply for a new Special Use Permit from Garfield County for this facility.
Noise: Staff recommends that as a condition of approval, the Applicant be required to submit
a final noise study for the proposed facility which indicates that the facility will not cause
noise levels which exceed the state statute. The Applicant has submitted a preliminary noise
study which indicates that noise at the property lines is expected to be in compliance with
the State Statute. However, if the facility does undermine the State statutes regarding noise
generation, the applicant will need to submit a plan for mitigating this noise. If this plan
requires amendments to the submitted and approved Special Use Permit, however, it is
possible that the Applicant will need to submit for a new Special Use Permit for this facility if
the mitigation measures require changes to the approved plan.
Groundwater Protection, Riparian Area Protection and Stream Protection: Staff recommends
a Condition of Approval that all construction and operation of the site occur in accordance
with the Storm Water Management Plan (SWMP) as submitted. In addition, as represented
in the application, Chevron USA Inc. shall conduct bi-weekly SWMP to ensure site
stabilization measures are adequate and/or identify areas that need repair or improvement.
Soil Contamination, Groundwater Contamination, Stream Protection, and Riparian Area
Protection: A Spill Prevention, Control, and Countermeasure (SPCC) plan has been
submitted. This plan is general to the "Picaence Basin Field" for Chevron USA, Inc. and is
dated 2004. Staff recommends a Condition of Approval that all construction and operation of
the site occur in accordance with the most up-to-date SPCC for this site.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 25
Stream Protection and Riparian Protection: The Applicant has conducted a floodplain study
for the "Picaence Basin Development — Central Production Facility". The study concludes
that the Central Production Facility as proposed is not within the 100 -year floodplain. In
addition, the study recommends that rip -rap slope protection be provided along the
embankments adjacent to the floodplain limits to prevent erosion on the embankment
slopes. Staff recommends that this be added as a Condition of Approval.
Soil Contamination, Groundwater Protection, and Stream Protection: All vault -and -haul
wastewater storage containers and ISDS's shall obtain an ISDS permit from the Garfield
County Building Department prior to installation.
Water Rights: Staff finds that the proposed water supply and wastewater disposal methods
are adequate as long as a condition is placed on the Special Use Permit requiring that the
Applicant submit an approved and adequate well permit to serve the permanent control
building prior to issuance of the Special Use Permit. In order to maintain consistency with the
proposed ISDS, this well permit should be adequate in terms of rights and quantity to serve
a workforce of up to ten (10) employees.
Noxious Weeds and Vegetation Management: In accordance with the comments received
from Steve Anthony of the Garfield County Vegetation Department, Staff recommends that a
condition of approval be added to the Special Use Permit requiring that the Applicant submit
a new Integrated Vegetation and Weed Management plan which incorporates that area
which is to be disturbed by the proposed Central Production Facility. This plan shall be
reviewed and deemed adequate by the Garfield County Vegetation Management
Department prior to issuance of the Special Use Permit. In addition, in order to maintain the
validity of the plan, the site shall not be graded or otherwise disturbed prior review and
acceptance of the plan by the Vegetation Management Department. Staff requests this
document no later than June 1, 2008.
Noxious Weeds and Vegetation Management: Staff recommends a condition of approval
requiring that before leaving the site, all off-road major construction equipment (graders,
dozers, etc) working in areas of mapped noxious weeds should be power washed to remove
seeds, soil, and vegetative matter.
Revegetation and Reclamation Security:
The applicant has quantified the surface area to be disturbed and subsequently
reseeded.
Temporary office area and Construction Site = 8.7 acres
Production facility = 3.3acres
The recommended security for the office area and const. area is $21,750 (8.7 acres
x $2500/acre).
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 26
The recommended security for the production facility acre is $13,200 (3.3 acres x
$4000/acre).
Since the production facility may be in place for 20 years or longer the per acre rate is
higher.
These securities should be done separately since the time frame for security release
is in the short term for the temporary office area.
The applicant shall provide the Vegetation Management Department with the original
tags from each seed bag. The seed mix in the Plan shall match the seed mix used
in the field. Do not use a seed mix containing yellow sweet clover (Melilotus
offcinalis) or annual yellow sweetclover (M. indicus). The amount of seed specified to
be planted in the Plan shall match the quantity of seed used in the field.
The security shall be held by Garfield County until vegetation has been successfully
reestablished according to the Reclamation Standards in the Garfield County Weed
Management Plan. It is the responsibility of the applicant to contact the County,
upon successful revegetation establishment, to request an inspection for security
release consideration.
Erosion Control: Any straw or hay bales used in erosion control shall be certified weed free.
Rehabilitation: Staff recommends that a "ripping" process for the soil be incorporated into the
revegetation and rehabilitation plan.
Wildlife Protection: Staff recommends that a condition of approval be added requiring that all
solid waste be handled within a wild -life proof refuse container which is emptied at least
once per week.
(A) A plan forsite rehabilitation must be approved by the County Commissioners before a
permit for conditional or special use will be issued;
Response
In accordance with the comments received from Steve Anthony of Garfield County Vegetation
Management, Staff recommends that a condition of approval be added to the Special Use Permit
requiring that the Applicant submit a new Integrated Vegetation and Weed Management plan which
incorporates that area which is to be disturbed by the proposed Central Production Facility. In
accordance with this Section of the Zoning Resolution of 1978, this plan shall be reviewed and
deemed adequate by the Garfield County Vegetation Management Department prior to issuance of
the Special Use Permit if this action is deemed appropriate by the BOCC.
Further, Staff recommends that a revegetation and rehabilitation security be put in place for 1) the
area to be disturbed for the placement of the temporary office and staging area (1.6 acres) and
general construction disturbance (5.6 acres) which shall be in place for up to one year from the date
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 27
of issuance of the Special Use Permit ($21,750); and 2) the area to be disturbed for the Central
Production Facility (3.3 acres) which shall be in place for at least a 20 year timeframe ($13,200).
Further, this revegetation security shall be subject to the comments as submitted by the Garfield
County Vegetation Management Department (Exhibit H) and clarification on acreages in Exhibit M.
(8) The County Commissioners may require security before a permit for special or
conditional use is issued, if required. The applicant shall furnish evidence of a bank
commitment of credit, bond, certified check or other security deemed acceptable by the
County Commissioners in the amount calculated by the County Commissioners to secure
the execution of the site rehabilitation plan in workmanlike manner and in accordance with
the specifications and construction schedule established or approved by the County
Commissioners. Such commitments, bonds or check shall be payable to and held by the
County Commissioners;
Response
In the past, the Board has required, as a condition of approval that "A sufficient monetary security,
determined by the Board of County Commissioners, to ensure rehabilitation of the site once
operation has ceased shall be provided by the Applicant."
Staff is recommending the following guidelines for revegetation and rehabilitation of the subject site:
Revegetation and Reclamation Security:
The applicant has quantified the surface area to be disturbed and subsequently reseeded.
Temporary office area and Construction Site
Production facility
= 8.7 acres
= 3.3 acres
The recommended security for the office area and const. area is $21,750 (8.7 acres x $2500/acre).
The recommended security for the production facility acre is $13,200 (3.3 acres x $4000/acre).
Since the production facility may be in place for 20 years or longer the per acre rate is higher.
These securities should be done separately since the time frame for security release is in the short
term for the temporary office area.
The applicant shall provide the Vegetation Management Department with the original tags from each
seed bag. The seed mix in the Plan shall match the seed mix used in the field. Do not use a seed
mix containing yellow sweet clover (Melilotus offcinalis) or annual yellow sweetclover (M. indicus).
The amount of seed specified to be planted in the Plan shall match the quantity of seed used in the
field.
Following further clarification from the Applicant (See Exhibit M), the total disturbance area is
actually 12 acres (8.7 to be reclaimed following construction and 3.3 acres to be disturbed over the
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 28
life of the facility). The security shall be held by Garfield County until vegetation has been
successfully reestablished according to the Reclamation Standards in the Garfield County Weed
Management Plan. It is the responsibility of the applicant to contact the County, upon successful
revegetation establishment, to request an inspection for security release consideration.
Section 5.03.08 !Industrial Performance Standardsl
Pursuant to section 5.03.08 of the Zoning Resolution, all Industrial Operations in the County shall
comply with applicable County, State, and Federal regulations regulating water, air and noise
pollution and shall not be conducted in a manner constituting a public nuisance or hazard.
Operations shall be conducted in such a manner as to minimize heat, dust, smoke, vibration, glare
and odor and all other undesirable environmental effects beyond the boundaries of the property in
which such uses are located, in accord with the following standards:
(1) Volume of sound generated shall comply with the standards set forth in the Colorado
Revised Statutes at the time any new application is made.
(2) Vibration generated: every use shall be so operated that the ground vibration
inherently and recurrently generated is not perceptible, without instruments, at any point of
any boundary line of the property on which the use is located.
(3) Emissions of smoke and particulate matter: every use shall be operated so as to
comply with all Federal, State and County air quality laws, regulations and standards.
(4) Emission of heat, glare, radiation and fumes: every use shall be so operated that it
does not emit heat, glare, radiation or fumes which substantially interfere with the existing
use of adjoining property or which constitutes a public nuisance or hazard. Flaring of gases,
aircraft warning signals, reflective painting of storage tanks, or other such operations which
may be required by law as safety or air pollution control measures shall be exempted from
this provision.
(5) Storage area, salvage yard, sanitary landfill and mineral waste disposal areas:
(A) Storage of flammable or explosive solids or gases shall be in accordance with
accepted standards and laws and shall comply with the national, state and local fire
codes and written recommendations/comments from the appropriate local protection
district regarding compliance with the appropriate codes;
(B) At the discretion of the County Commissioners, all outdoor storage facilities
may be required to be enclosed by fence, landscaping or wall adequate to conceal
such facilities from adjacent property;
(C) No materials or wastes shall be deposited upon a property in such form or
manner that they may be transferred off the property by any reasonably foreseeable
natural causes or forces;
(D) Storage of Heavy Equipment will only be allowed subject to (A) and (C) above
and the following standards:
1. The minimum lot size is five (5) acres and is not a platted subdivision.
2. The equipment storage area is not placed any closer than 300 ft. from
any existing residential dwelling.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 29
3. All equipment storage will be enclosed in an area with screening at
least eight (8) feet in height and obscured from view at the same
elevation or lower. Screening may include berming, landscaping, sight
obscuring fencing or a combination of any of these methods.
4. Any repair and maintenance activity requiring the use of equipment that
will generate noise, odors or glare beyond the property boundaries will
be conducted within a building or outdoors during the hours of 8 a.m.
to 6 p.m., Mon. Fri.
5. Loading and unloading of vehicles shall be conducted on private
property and may not be conducted on any public right-of-way.
(E) Any storage area for uses not associated with natural resources shall not
exceed ten (10) acres in size.
(F) Any lighting of storage area shall be pointed downward and inward to the
property center and shaded to prevent direct reflection on adjacent property.
(6) Water pollution: in a case in which potential hazards exist, it shall be necessary to
install safeguards designed to comply with the Regulations of the Environmental Protection
Agency before operation of the facilities may begin. All percolation tests or ground water
resource tests as may be required by local or State Health Officers must be met before
operation of the facilities may begin.
Staff Response
Should the Board approve the request for the Compressor Station, Staff suggests the industrial
performance standards be considered conditions of approval as they are specifically intended to
ensure that any industrial use such as the proposed Central Production Facility function in
accordance with the proper best management practices and within the parameters of the State
Statutes.
Section 9.03.05!Periodic Review of SUPT
Pursuant to section 9.03.05 of the Zoning Resolution:
Any Special Use Permits maybe made subject to a periodic review not less than every six (6)
months if required by the County Commissioners. The purpose of such review shall be to
determine compliance or noncompliance with any performance requirements associated with
the granting of the Special Use Permit. The County Commissioners shall indicate that such a
review is required and shall establish the time periods at the time of issuance of a Special
Use Permit. Such review shall be conducted in such manner and by such persons as the
County Commissioners deem appropriate to make the review effective and meaningful.
Upon the completion of each review, the Commissioners may determine that the permit
operations are in compliance and continue the permit, or determine the operations are not in
compliance and either suspend the permit or require the permittee to bring the operation into
compliance by a certain specified date. Such periodic review shall be limited to those
performance requirements and conditions imposed at the time of the original issuance of the
Special Use Permit.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 30
VIII. RECOMMENDED FINDINGS
1. Proper posting and public notice was provided as required for the meeting before the Board of
County Commissioners.
2. The meeting before the Board of County Commissioners was extensive and complete, that all
pertinent facts, matters and issues were submitted and that all interested parties were heard at
that meeting.
3. The above stated and other reasons, the proposed special use permit has been determined to
be in the best interest of the health, safety, morals, convenience, order, prosperity and welfare of
the citizens of Garfield County.
4. The application has met the requirements of Special Use (Sections 5:03, 5:03:07, 5:03.08 and
9:03) the Garfield County Zoning Resolution of 1978, as amended.
IX. STAFF RECOMMENDATION
Due to 1) the limited nature of potential impacts to surrounding properties, 2) the remote location of
the property such that it is situated at the end of a dead-end county road which is used primarily for
industrial traffic serving the existing industrial uses in the area with very limited general population
traffic, 3) and the fact that the site itself will be situated in an industrial area already characterized by
industrial activity from the oil shale and natural gas exploration activities, Staff recommends the
Board approve the request for a Special Use Permit for Processing and Material Handling of Natural
Resources for a Central Production Facility for Chevron USA, Inc. with the following conditions:
1. That all representations of the Applicant, either within the application or stated at the
hearing before the Board of County Commissioners, shall be considered conditions of
approval unless explicitly altered by the Board.
2. The Applicant shall comply with all standards as set forth in §5.03.08 "Industrial
Performance Standards" of the Garfield County Zoning Resolution of 1978 as amended
and included here as follows:
a. Volume of sound generated shall comply with the standards set forth in the Colorado
Revised Statutes.
b. Every use shall be so operated that the ground vibration inherently and recurrently
generated is not perceptible, without instruments, at any point of any boundary line of
the property on which the use is located.
c. Emissions of smoke and particulate matter: every use shall be operated so as to
comply with all Federal, State and County air quality laws, regulations and standards.
d. Every use shall be so operated that it does not emit heat, glare, radiation or fumes
which substantially interfere with the existing use of adjoining property or which
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 31
constitutes a public nuisance or hazard. Flaring of gases, aircraft warning signals,
reflective painting of storage tanks, or other such operations which may be required
by law as safety or air pollution control measures shall be exempted from this
provision.
e. Storage of flammable or explosive solids or gases shall be in accordance with
accepted standards and laws and shall comply with the national, state and local fire
codes and written recommendations/comments from the appropriate local protection
district regarding compliance with the appropriate codes.
f. No materials or wastes shall be deposited upon a property in such form or manner
that they may be transferred off the property by any reasonably foreseeable natural
causes or forces.
g•
Any repair and maintenance activity requiring the use of equipment that will generate
noise, odors or glare beyond the property boundaries will be conducted within a
building or outdoors during the hours of 8 a.m. to 6 p.m., Mon. -Fri.
h. Loading and unloading of vehicles shall be conducted on private property and may
not be conducted on any public right-of-way.
i. Any storage area for uses not associated with natural resources shall not exceed ten
(10) acres in size.
j. Any lighting of storage area shall be pointed downward and inward to the property
center and shaded to prevent direct reflection on adjacent property.
3. That the operation of the facility be done in accordance with all applicable federal, state,
and local regulations governing the operation of this type of facility.
4. That the Applicant shall comply with the fire protection provisions included in the rules and
regulations of the Colorado Oil and Gas Conservation Commission (COGCC) and the
International Fire Code as the Code pertains to the operation of this facility.
5. The total area of disturbance shall not exceed 12 acres in size. The Central Production
Facility and Flare Safety Zone at completion shall have a footprint no larger than 4.8 acres.
6. That all proper building permits and ISDS permits are obtained for the structures and
wastewater disposal systems, including vault -and -haul systems, associated with the
operation of the Central Production Facility.
7. Sewage systems shall to be installed and maintained in accordance with the Garfield
County ISDS regulations with all pipes and connections water tight and lids kept securely in
place at all times except during normal cleaning operations.
8. The facility shall have a minimum total capacity of 6,050 gallons of potable water storage
which shall be refilled a minimum of every three days in connection with 1.4 acre temporary
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 32
storage (staging) area. These tanks shall be removed at the point that the flare is
operational and the lay down yard (Staging Area) is decommissioned. The permanent
Control Building shall be connected to a permanent water supply system.
9. The facility shall have a minimum total capacity of 3,025 gallons of potable water storage
capacity which shall be refilled a minimum of every three days from either well water
produced on the subject property as demonstrated within this application or from water
purchased from a water supplier in connection with the permanent Control Building.
10. The facility shall have a minimum total capacity of 8,060 gallons of sewage and wastewater
storage capacity which shall be emptied a minimum of every three days. These tanks shall
be removed at the point that the flare is operational and the lay down yard (Staging Area) is
decommissioned. The permanent Control Building shall be connected to the ISDS and shall
not be served by sewage vault tanks.
11. Wildlife -proof refuse and/or recycling containers must be provided for trash. At least one
thirty (30) cubic yard container shall be provided for the facility. Said container(s) must be
durable, washable, non-absorbent metal or plastic with tight -fitting lids. Refuse shall be
disposed of not less than once weekly.
12. All equipment and structures must be painted in accordance with the BLM Gold Book
standards.
13. The Applicant shall treat the gravel surfaces within the facility periodically as needed with
an approved dust suppressant to control fugitive dust.
14. The Applicant shall have six (6) months from the date of issuance of the Special Use Permit
for Chevron USA Inc. to obtain and be approved for the Synthetic Minor permit from
CDPHE. If Chevron USA, Inc. fails to obtain a permit within the specified timeframe, the
permit is denied by CDPHE, or the conditions of the permit modify the site plan as approved
under this Special Use Permit, the approved Special Use Permit from Garfield County shall
become null and void. At this point, Chevron USA, Inc. will need to reapply for a new
Special Use Permit from Garfield County for this facility.
15. The Applicant is required to submit a final noise study for the proposed facility which
indicates that the facility will not cause noise levels which exceed the state statute. If the
facility does not conform to the State statutes regarding noise generation, the applicant will
need to submit a plan for mitigating this noise. If this mitigation plan requires amendments
to the submitted and approved Special Use Permit or any representations made the
Applicant however, the Applicant shall submit for a new Special Use Permit from Garfield
County for this Central Production Facility.
16. All construction and operation of the site shall occur in accordance with the Storm Water
Management Plan (SWMP) as submitted. In addition, as represented in the application,
Chevron USA Inc. shall conduct bi-weekly SWMP inspections to ensure site stabilization
measures are adequate and/or identify areas that need repair or improvement.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 33
17. All construction and operation of the site shall occur in accordance with the most up-to-date
SPCC plan for this site.
18. The embankments adjacent to the floodplain limits shall have rip -rap slope protection in
order to prevent erosion on the embankment slopes.
19. The Applicant shall submit an approved and adequate well permit to serve the permanent
control building prior to issuance of the Special Use Permit. In order to maintain consistency
with the proposed ISDS, this well permit shall be adequate in terms of rights and quantity to
serve a workforce of up to ten (10) employees.
20. The Applicant shall submit a new Integrated Vegetation and Weed Management plan which
incorporates that area which is to be disturbed by the proposed Central Production Facility.
This plan shall be reviewed and deemed adequate by the Garfield County Vegetation
Management Department prior to issuance of the Special Use Permit. The Applicant shall
submit this plan by June 1, 2008, shall NOT grade or disturb any portion of the subject site
prior to the Integrated Vegetation and Weed Management plan's review and acceptance by
the Garfield County Vegetation Management Department and shall incorporate a soil
"ripping" process into this revegetation and rehabilitation plan.
21. Before leaving the approved site, all off-road major construction equipment (graders,
dozers, etc) working in areas of mapped noxious weeds shall be power washed to remove
seeds, soil, and vegetative matter.
22. The Applicant shall provide a security for revegetation in the amount $21,750 to cover the
estimated 8.7 acres to be disturbed prior to issuance of the Special Use Permit (using a
rate of $2500 per acre for a facility that may be in place for up to one year). The security
shall be held by Garfield County until vegetation has been successfully reestablished
according to the Reclamation Standards in the Garfield County Vegetation Management
Plan. It is the responsibility of the applicant to contact the County, upon successful
revegetation establishment, to request an inspection for security release consideration.
The applicant shall provide the Vegetation Management Department with the original tags
from each seed bag. The seed mix in the Plan shall match the seed mix used in the field.
Do not use a seed mix containing yellow sweet clover (Melilotus offcinalis) or annual yellow
sweetclover (M. indicus). The amount of seed specified to be planted in the Plan shall
match the quantity of seed used in the field.
23. The Applicant shall provide a security for revegetation in the amount $13,200 to cover the
estimated 3.3 acres to be disturbed prior to issuance of the Special Use Permit (using a
rate of $4000 per acre for a facility that may be in place for up to twenty (20) years). The
security shall be held by Garfield County until vegetation has been successfully
reestablished according to the Reclamation Standards in the Garfield County Vegetation
Management Plan. It is the responsibility of the applicant to contact the County, upon
successful revegetation establishment, to request an inspection for security release
consideration.
Chevron USA Inc. — Central Production Facility
BOCC — 03/10/2008
Page 34
The applicant shall provide the Vegetation Management Department with the original tags
from each seed bag. The seed mix in the Plan shall match the seed mix used in the field.
Do not use a seed mix containing yellow sweet clover (Melilotus offcinalis) or annual yellow
sweetclover (M. indicus). The amount of seed specified to be planted in the Plan shall
match the quantity of seed used in the field.
24. Any straw or hay bales used in erosion control shall be certified weed free.
X. RECOMMENDED MOTION
"I move to approve a Special Use Permit for a Central Production Facility and Staging Area for
Chevron USA, Inc with the conditions provided by Staff."
GARFIELD COUNTY
Building & Planning Department
Review Agency Form
Date Sent: February 27, 2008
Comments Due: February 27, 2008
Name of application: Chevron Storage Handling Facility
Sent to:
Garfield County requests your comment in review of this project. Please notify the
Planning Department in the event you are unable to respond by the deadline. This form
may be used for your response, or you may attach your own additional sheets as
necessary. Written comments may be mailed, e-mailed, or faxed to:
Garfield County Building & Planning
Staffs contact: David Pesnichak
109 8th Street, Suite 301
Glenwood Springs, CO 81601
Fax: 970-384-3470
Phone: 970-945-8212
General Comments: Garfield County Road & Bridge Department has no objections to
this application with the following comments.
As this in on private land with a permitted driveway access to the property no further
requirements to meet the driveway access permit is necessary.
All vehicles hauling equipment and materials for the building of the facility will abide by
Garfield Counties oversize/overweight system. Vehicles requiring oversize/overweight
permits operating under Chevrons bond will have a letter on file with Garfield County
Road & Bridge Department prior to the issuing of any permits.
As Chevron has already committed to road repair and road maintenance no further
commitment is required from them for the roads they will be using.
Name of review agency: Garfield County Road and Bridge Dept
By: Jake B. Mall
Date _February 27, 2008
Revised 3/30/00
EXHIBIT
MEMORANDUM
To: David Pesnichak
From: Steve Anthony
Re: Comments on the Chevron Piceance Production Facility and Special Use Permit
Date: February 27, 2008
Thanks for the opportunity to comment on this project. My comments are as follows:
Integrated Vegetation and Weed Management
• The submitted vegetation and weed management plan is for an area outside of the project site.
Staff requests that the applicant submit a plan for the project area. This includes weed inventory,
weed management, and revegetation.
• Before leaving the site, all off road major construction equipment (graders, dozers, etc) working in
areas of mapped noxious weeds should be power washed to remove seeds, soil, and vegetative
matter.
• The comments below are excerpted from a memo from Vegetation Management staff to Building
and Planning regarding the Piceance Gathering Pipeline Project (July 20, 2007):
The noxious weed, tamarisk, is located in within 200 feet of the pipeline in many points along
the pipeline. The applicant shall cut and treat the tamarisk prior to construction activities.
Please forward a copy of the application records to the below address.
Garfield County Vegetation Management
POB 426
Rifle CO 81650
To date, this office has not received records indicating that the tamarisk work was done.
Reclamation
• The applicant has quantified the surface area to be disturbed and subsequently reseeded.
Temporary office area
= 1.4 acres
Production facility (including road) = 3.5 acres
The recommended security for the office area is $3500 (1.4 acres x $2500/acre).
The recommended security for the production facility acre is $14,000 (3.5 acres x $4000/acre).
Since the production facility may be in place for 20 years or longer the per acre rate is higher.
These securities should be done separately since the time frame for security release is in the short
term for the temporary office area.
• The applicant shall provide the Vegetation Management Department with the original tags from
each seed bag. The seed mix in the Plan shall match the seed mix used in the field. Do not use a
seed mix containing yellow sweet clover (Melilotus offcinalis) or annual yellow sweetclover (M.
indicus). The amount of seed specified to be planted in the Plan shall match the quantity of seed
used in the field.
• The security shall be held by Garfield County until vegetation has been successfully reestablished
according to the Reclamation Standards in the Garfield County Weed Management Plan. It is the
responsibility of the applicant to contact the County, upon successful revegetation establishment,
to request an inspection for security release consideration.
Erosion control
• Any straw or hay bales used in erosion control shall be certified weed free.
STATE OF COLORADO
Bill Ritter, Jr., Governor
DEPARTMENT OF NATURAL RESOURCES
DIVISION OF WILDLIFE
AN EQUAL OPPORTUNITY EMPLOYER
Thomas E. Remington, Director
6060 Broadway
Denver, Colorado 80216
Telephone: (303) 297-1192
wildlife.state.co.us
February 25, 2007
David Pesnichak
Garfield County Building and Planning Department
108 8th Street, Suite 401
Glenwood Springs, CO 81601
EXHIBIT
1
r
r
FEB
E 2 7 2008
RE: Piceance Basin Natural Gas Development Program — Early Production System
Central Production Facility and Temporary Storage Area (Job # 29021-003)
Dear Mr. Pesnichak,
For Wildlife -
For People
Thank you for the opportunity to comment on the proposed Central Production Facility (CPF) and Temporary
Storage Area. The Division of Wildlife acknowledges Chevron's request to develop a CPF and an associated
temporary storage area on land currently zoned as grazing/ agriculture; located in the Clear Creek drainage near
the confluence of Tom Creek and Clear Creek, north of the town of De Beque, CO. The proposed development
lies at the base of a steep slope with west and south facing aspects. The Division of Wildlife would like to offer
the following comments with regard to potential impacts this development may have on wildlife.
Habitat
The proposed building site is located near the confluence of Tom Creek and Clear Creek. Tom Creek, a
tributary to Clear Creek, which provides some riparian habitat as it flows intermittently and periodically
disappears under ground. Riparian areas such as this are highly valuable to wildlife, as they provide both
permanent habitat and migration corridors allowing movement from one area to another. The riparian
vegetation along Tom Creek consists of a few deciduous shrubs and woodland over story comprised of
mountain boxelder, locust, willow and cottonwood.
Habitat surrounding the proposed site is characterized by sagebrush -steppe, mountain shrub and
woodland vegetation, consisting primarily of Gambel's oak, Douglas fir, big sagebrush, rabbitbrush,
snowberry, serviceberry, chokecherry, sumac, and several forbs and grasses. This habitat provides critical
summer range for mule deer; summer range, severe winter range and winter concentration area for elk;
year-round and production range for wild turkey; summer and fall concentration areas for black bears;
year-round range for mountain lion; and production areas and winter range for Greater sage grouse. The
proposed facility lies in close proximity to at least two active sage grouse leks on Skinner Ridge. The
proposed facility also lies in close proximity of sage grouse brood area on Puddin Ridge.
The proposed CPF and the associated temporary storage area locations lie in an area where native
vegetation provides foraging, nesting, thermal and escape habitats for numerous species of wildlife. The
removal and disturbance of native vegetation for the construction of the CPF, temporary storage area and
associated roads will negatively impact the native wildlife species associated with this project area.
Upon rehabilitation of this location and roads, negative impacts to native wildlife can be offset by
planting a suitable mixture of native grass/forb/shrub seed. Seed plantings on disturbed soils will have
DEPARTMENT OF NATURAL RESOURCES, Harris D. Sherman, Executive Director
WILDLIFE COMMISSION, Tom Burke, Chair • Claire O'Neal, Vice Chair • Robert Bray, Secretary
Members, Dennis Buechler • Brad Coors • Jeffrey Crawford • Tim Glenn • Roy McAnally • Richard Ray
Ex Officio Members, Hams Sherman and John Stulp
greater germination and survival rates when the soil surface has been prepared to hold moisture and
runoff precipitation. Soils will exhibit increased moisture retention capabilities when the soil surface has
been loosened with a "ripping tool" that creates a rough and uneven soil surface and seedbed. This
treatment will increase seed germination, and, will reduce the amount of surface runoff and soil erosion.
Weed Control
Non-native weed species have become established on many disturbed soils throughout the Roan Creek
area. The disturbance of soil, particularly along riparian corridors, increases the chance of non-native
weed invasion. The invasion of non-native weeds reduces the density of native vegetation and lessens the
habitat values for native wildlife species. The continual control and removal of non-native weeds on the
disturbed/rehabilitated sites of this project will help restore native vegetation that is valuable to wildlife.
The Division of Wildlife notes that the Integrated Vegetation and Noxious Weed Management Plan
sufficiently addresses these issues and includes recommendations for treatment and reduction of non-
native weeds. The Division of Wildlife supports these recommendations, and would gladly provide any
additional information needed on weed control.
Roads
Bears
The Division of Wildlife notes and supports that minimal new roads are proposed with this new
development. Minimizing the number of roads will benefit wildlife, as building of multiple roads in an
area increases fragmentation of habitat, inhibits the natural movement of wildlife across the landscape,
increases road -kill mortality, and broadens the opportunity for poaching. Minimizing roads and road use
will also decrease fugitive dust, which can become severe during dry summer months. The Division of
Wildlife recommends that Chevron strictly enforce speed limits on new and existing roads, and employ
dust control measures as needed.
The proposed CPF and the associated temporary storage area locations lie within year-round black bear
habitat. Increased human use of the proposed development area may increase the potential for conflicts
with black bears during the summer and early fall, particularly during years of drought. The potential for
human/bear conflicts within this project area would be greatly reduced by placing and utilizing "bear
proof" trash containers at work-site/camping locations. These trash containers should be emptied weekly
at a minimum. The Division of Wildlife has information on the design and purchase of "bear proof" trash
containers, and, will provide this information to anyone who is interested in preventing conflicts with
bears.
The Division of Wildlife recommends that employees be required to comply with "bear aware" policies
regarding food, trash, BBQ grills, and birdfeeders; and educated on what to do if they encounter a bear.
The Division of Wildlife would gladly offer specific on-site recommendations to minimize human -bear
conflict, and provide bear education seminars for contractors and/or employees.
Workers affiliated with this project should be advised not to feed bears, whether intentional or not, since
this activity is detrimental to black bears, and is a violation of Colorado Wildlife Commission Regulation
(WCR) #021(D). WCR #021(D) states, it is unlawful for any person to fail to take remedial action to
avoid conflict with black bears after being notified by the Division of Wildlife that black bears are in the
area. The Division of Wildlife recommends Chevron employees and subcontractors be advised of this
regulation (WCR #021(D)). The Division also suggests workers affiliated with this project be notified that
failure to comply with the regulation will result in the issuance of a citation by the Division of Wildlife.
Cumulative Impacts
Negative impacts to wildlife become significant when habitat disturbances caused by gas development are
added over time and become cumulative. Negative impacts to wildlife are a result of noise from well
heads and compressors; increased sedimentation; disturbance of fragile soils and steep slopes; loss of
winter forage for wildlife; loss of migration corridors for wildlife; human disturbance to wintering
populations of wildlife; animal harassment as a result of increased human activity; vegetation disturbance
by road, pipeline and well pad construction; increased invasion of noxious weeds to disturbed sites; and
increased access into roadless areas resulting in a loss of seclusion for wildlife and increased vulnerability
to poachers. Furthermore, the rate in which disturbed sites are reclaimed is not equal to the rate of
disturbances created by gas development. As a result, there is significant deficit to biologic systems
created and compounded by the time it takes to restore lost habitat.
Poaching
Multiple species of wildlife that inhabit the area surrounding the proposed facility, including elk, mule
deer, black bear, mountain lion, wild turkey and sage grouse, may be extremely vulnerable to illegal
hunting during various times of the year. Wildlife species often concentrate near roads and riparian areas,
particularly during the winter months when deep snow forces them to lower elevations. Wildlife along
roadside habitats may become highly visible during certain times of the year and become easy targets for
poaching. The Division of Wildlife acknowledges that DOW Law Enforcement presence is welcome at
all times on Chevron property, and recommends that Chevron continue to internally enforce their rules
regarding possession of firearms. Furthermore, the Division of Wildlife encourages Chevron and its
employees to report any incidents of poaching immediately to the Division of Wildlife. If a poaching
incident occurs, representatives of Chevron should immediately call the District Wildlife Manager (via
the Colorado State Patrol at 970-249-4392, if after normal business hours) or Operation Game Thief
(OGT) at 1-877-265-6648. Chevron should educate workers about poaching and encourage reporting of
such incidents to Operation Game Thief.
Thank you for the opportunity to comment on the Central Production Facility and Temporary Storage Area (Job #
29021-003) development proposal. The Division of Wildlife appreciates the opportunity to comment on new
developments in Garfield County. Please feel free to contact District Wildlife Manager Albert Romero at 970-
255-6154 should you have any questions or require additional information.
Sincerely,
Dean Riggs
Area Wildlife Manager
cc: Ron Velarde, Northwest Regional Manager
Brad Petch, Senior Wildlife Conservation Biologist
Albert Romero, District Wildlife Manager
Preliminary Noise Study Information
From Paul Kiteck of Hoover & Keith
EXHIBIT
I have just completed a preliminary noise analysis of the Central Production Facility (CPF) for
the Chevron Piceance Development Project based on the understood current design/layout of the
CPF but do not have the results available in a document. Therefore, in this email, I will provide a
summary of the findings that hopefully can support the permitting requirements prior to a more
formal document with the results to be provided in the near future.
Typical ambient sound levels for the area: 25 to 35 dBA (i.e., average ambient A -wt. sound levels
of 30 dBA). Consequently, if the resulting/predicted sound level contribution due to the CPF
during operation is equal to or less than the ambient sound level (e.g., 30 dBA), the noise of the
facility will probably not be audible.
1) Estimated sound level contribution of the CPF (during full load operation) at a distance of 1
mile south of the facility (in the area of the canyon, along Clear Creek Road): 30 to 35 dBA
Consequently, at the closest residences to the CPF (i.e., homes at intersection of Clear Creek Rd.
& CR -204, in the area of the Cowboy Chapel, which are approx. 6 miles from CPF), the noise of
the CPF during operation should not be audible.
2) Estimated sound contribution of CPF at the closest "non -Chevron" property of potential
concern (i.e., Colorado Nature Ranch, approx. 4,500 feet to 1 mile west of CPF): 20 to 25 dBA
Consequently, the noise of the CPF should not be audible at the Colorado Nature Ranch, noting
that the Shiner Ridge, located between the CPF & Nature Ranch, will provide significant
attenuation of the CPF noise).
3) Estimated sound contribution of CPF at 1/2 mile south of the facility (along Clear Creek Rd):
42 to 45 dBA
4) Estimated sound contribution of CPF at 350 feet from the site center (i.e., Compressor
Building): 60 to 65 dBA
Note that the noise requirements of the COGCC could require that the CPF achieve 50 dBA
(nighttime) at 350 feet if there were occupied structures, such as residences, located near the
facility that are not on Chevron property. Since there are no residences near the CPF, based on
our interpretation of the COGCC regulations, the CPF is required to meet the "light industrial
standard" (i.e., 65 dBA, nighttime) at the Chevron property line, for which the CPF should easily
achieve.
This is a summary of the preliminary noise analysis of the CPF, and it is anticipated that any
other facilities associated with the project, such as Well Pads with booster compressors, will
generate lower sound levels than the CPF during full load operation.
MEMORANDUM
To: David Pesnichak
From: Steve Anthony
Re: Followup Comments on the Chevron Piceance Production Facility and Special Use Permit
Date: February 28, 2008
Sally Cuffin from URS contacted me this morning. Sally will provide a more detailed weed
inventory of the project site to the County by June 1, 2008. She is looking into the tamarisk issue
(mentioned in the earlier memo and referencing tamarisk treatment on the pipeline project) and will
provide further information to our office.
February 28, 2008
Mr. David Pesnichak
Garfield County Planning
108 8`I' Street, Suite 401
Glenwood Springs, CO 81601
MOUNTAIN CROSS
ENGINEERING, INC.
CIVIL AND ENVIRONMENTAL CONSULTING AND DESIGN
EXHIBIT
RE: Review of Central Production Facility & Temporary Storage SUP for Chevron USA.
Dear David:
This office has performed a review of the documents provided for the Central Production Faci.lity
and Temporary Storage Area of Chevron USA, Inc. -The submittal was found to be thorough and
well organized. The following continents, questions, or concerns were generated:
1. Multiple permits are in various stages of completion: Grading, Special Use, Building, Flood
Plain, etc. Copies of permits should be conditions of approval and provided to Garfield County
as they are obtained.
2. Flood plains are delineated and have fill placement proposed. Garfield County flood plain
perinits may be required.
3. The application proposes bottled water and portable toilets. The duration of the project does not
seem to warrant what would generally be considered a temporary solution.
4: The potential duration of the project warrants. a more .permanent solution for water and
wastewater such as wells and ISDS. These are discussed as future possibilities in the narrative
section of the application. However there are setbacks, restricted uses, and design
considerations that are. associated with wells and ISDS. At a minimum, these should. be
considered at this time so that the proposed buildings and appurtenances do not conflict and
preclude these for the future.
5. The water supply contracted by Down Valley Septic is purchased from the Town of Silt. In
times of drought, municipalities often turn off water supplies to these outside contractors. An
adequate and legal supply of water should be verified by the •applicant.
6. According to the applications, sounds studies and wildlife mitigation measures are in various
stages of completion. These should be completed and submitted to the County.
Feel free to call if any of the above .needs clarification or if you have any questions or comments.
Sincerely,
Mounta'j Cross Engi eer'ng, Inc.
e
Chris Hale, PE
82.6 1/2 Grand Avenue • Glenwood Springs, CO 81601
PH: 970.945.5544 • FAX: 970.945.5558 • www.mountaincross-eng.com
David Pesnichak
From: Cuffin, Sally [Sally.Cuffin@wgint.com]
Sent: Friday, February 29, 2008 3:57 PM
To: David Pesnichak
Subject: RE: Chevron CPF - Change in Grading Plans
Dave,
Per your request...
EXHIBIT
1/1
The total site disturbance for the Central Production Facility will include about 12
acres. This includes the actual facility location (3.3 acres), a temporary storage area
(multi-purpose area - 1.6 acres), a topsoil stockpile (about 1.5 acres), and general
construction activity disturbance (about 5.6 acres).
The majority of the site will be reclaimed shortly after construction (8.7 acres), while
the actual facility (3.3 acres) will remain in operation for the life of the gas field
operations.
Sally
But I need to ask one more question... My understanding is that this facility will be
operational for at least 30 years, unless the field depletes faster than anticipated. How
does that affect the bond?
From: David Pesnichak [mailto:dpesnichak@garfield-county.com]
Sent: Fri 2/29/2008 3:17 PM
To: Cuffin, Sally
Subject: RE: Chevron CPF - Change in Grading Plans
Thanks Sally,
So if I understand this correctly, we are looking at 8.7 acres of disturbance to be
secured for 1 year or less ($2500 per acre) and 3.3 acres to be secured under the 20 year
timeframe ($4000 per acre)?
Am I on the right track here?
Also, is it possible for you to send me a simple email to this effect which I can attach
as an exhibit to show that I did not just make these numbers up?
Thanks,
Dave
David Pesnichak
Senior Planner - Long -Range
Garfield County
108 8th Street, Suite 401
Glenwood Springs, CO 81601
Tel: (970) 945-8212
Fax: (970)384-3470
Email: dpesnichak@garfield-county.com
www.garfield-county.com
1
U
m
1
00-L90-LL-ZI-SZO
----------
RECEIVED
MAR 0 7 2008
r ,
BUiLOli'Ki & i LAidMNG
O
CC
3
2
2 2
W
CC
1
6
S
a
pis i�u� �z+srrir�r�u�
a
Y
r
a
a
pr.
ar.
s
5
1
i
a
dg
$g
a
a
1
6
M
1.0
o
CO
2
ao
a
tl
a
UU1LL)
` D I
N
M
I
CO
REC
MAR 0 sHflC
I
i.e ... . i-'LAi NG
IF
_
RON NORTH AMERICA
nap DEVELOPMENT -EP:
:NTRAL FACILITIES
,MENT ARRANGEMENT
.f. I
4 a
' #
1
\-(1
s
..1
,
,,
\
\
\
'''\
i.
:
:
11
!Dim
1
ith
—
7 ‘• . — , „
_ • .. _ •
,..,
•
I'
r '
5 i
i 1
‘t
)
.11..F.P.1 11
4 ' wrornixwo
4
1
Fel el,
1
e
tIES
,
ff•XII
‘i
0 0
-1
0 0
1.
,-.-.
:‘
N
1—
,
el
•
y
,
4
--
10
Iii
1
.
1
4
H •
PI 61 1 1 10,
T
lq
L
ig
,
_
111
Cd lIT
I
_
H
I
i
At r—
11
.. I
11 1
1
iti 1—
il
1
---‘.
1
-11--r-,--
b.
4-
_a
_,L,1_,i
I
g
•
,- I N 1 • 1 • 1 o I • I .. I •
Revised Equipment List / Electrical Equipment Detail
1.3 Required Production Equipment / Storage Items
The current CPF equipment list includes the following:
MAR 0 7 2008
• Gas Separator (two phase)
• Liquid Separator (three phase)^E{.
• 3 Compressor Skids complete with: Add 1 Permanent and 1 12ental' Compressor•Skids —
for a total of 4 Permanent and 1 Rental Unit
o Compressor
o Natural Gas Engine
o Bottles
o Scrubbers
o Coolers
o Interconnect Piping (ICP)
o Programmable Logic Controller (PLC)
o Lubrication system
• Glycol Dehydration Tower — Add another tower for a total of 2
• 2 Glycol Regeneration Skids (called out as Glycol Reboilder / Surge
• Volatile Organic Compound Recovery Skid for Glycol Dehydration
Combuster Skid on drawing)
• Water Surge Tank & Transfer Pumps (called out as Produced Water
Pumps on Drawing)
• Add Condensate Loading Skid
• Condensate Settling Tank
• Produced Water Tank
• 6 Condensate Tanks
• Flare Scrubber / Pump Skid
• Flare Stack
• 2 Gas Pipeline Scrapper (Pig) Receivers — Gathering Line Cleaner
• 2 Liquid Pipeline Scrapper (Pig) Receiver — Gathering Line Cleaner
• Chemical Injection Points
• Add Sump Tank for Servicing Scrappers
• Emergency Shutdown / Fire & Gas System (ESD / F&G)
• Vapor Recovery Unit (VRU) Skid for Off -Gas Recovery
• Instrument Air Compressor Skid
• Power Generation / Distribution
• Add Gas Filter Separator
• Add Fuel Gas Skid
• Add Start Air Receiver Skid
• Electrical Building (8 ft x 40 ft)
• Add Second Electrical Building (40 ft x 40 ft)
• Electrical Substation Building (20 ft x 20 ft)
• Control Building (8 ft x 40 ft)
• Warehouse Building (8 ft x 40 ft)
• Add Second Warehouse Building (40 ft x 40 ft)
• Compressor Building (53 ft x 154.5 ft)
• Instrument Air Building (20 ft x 20 ft)
Skid on Drawing)
System (called out as
& Condensate
• Add Telecommunications Building (10 ft x 12 ft)
• - Replaced by
second Electrical Building
• 1 Gas Turbine System Transformers and Associated Electrical Equipment (Now shown
connected to turbine generator)
• Programmable Logic Controllers & Infield Ethernet Ring
• Associate Piping and Control Cables
1.7.5 Major Electrical Equipment
In order to power the CPF equipment until the field electrical distribution system is available (see
Section 1.8), the following electrical generation and distribution equipment are proposed for the
CPF location. All electrical equipment will be located away from the hydrocarbon -handling
portions of the CPF (see Drawing 2033 -240 -20 -AP -0002-0002-01, Rev. b IC). Additional
electrical generation system layout information is provided on Drawing PSBR 607A ELE GAR
URS 00000 00001 00 Drawing 2033 -240 -20 -AP -0002-0002-01, Rev. 1 C. Major equipment
items include:
• Gas turbine -driven generator (rated at 2.5 MW) - provides power for continuous operation of
the CPF (see Drawings 63771-149063, Rev. 01, Sheets 5, 7, 8, and 11);
power to the electrical system if required;
• Diesel engine -driven generator (rated at 750 kW) - provides backup power when the gas
turbine -driven generator is not in service (also provides the power required to start the gas
turbine -driven generator);
• A future rental diesel engine -driven generator (rated at up to 500 750 kW) will be used until
the gas turbine generator is available Otherwise this unit will be used on a temporary basis
when the backup diesel engine -driven generator or gas turbine -driven generator(s) is not in
service;
• Power distribution center with switchgear and adjacent transformers for distributing power
from the generators to the CPF equipment and nearby 25 kV distribution lines; and
• Diesel fuel storage tank to provide a 3 -day fuel reserve for diesel engine -driven generators.
The fuel gas skid to supply natural gas to the gas turbine -driven generator will be located away
from the generators and near the fuel gas skid that supplies the engines for the CPF main gas
compressors.
75 150
300
eet
CPF AREA
Tom Creek Natural Springow
and Facility Layout
Ivo
'...,1-..........c..tb. t/....e:eu
Ew.�..e..,,a..m,�..„
SU. MO SWAM RIME
m'
O ' d er. CO
PROPERTYWIVw
°{
� coax.
tee.. n..e
URS
REvsaa
w. n w..on nR
o
w
EXHIBIT
5
CHEVRON PICEANCE BASIN NATURAL
GAS DEVELOPMENT PROJECT
(GARFIELD COUNTY, COLORADO)
RESULTS OF A PRELIMINARY ACOUSTICAL ASSESSMENT OF
THE PROJECT WHICH INCLUDES A CENTRAL PRODUCTION
FACILITY AND SEVERAL NATURAL GAS WELL SITES
H&K Report No. 2205
H&K Job No. 4004
Date of Report: March 6, 2008
Prepared for:
Project Applicant:
Submitted by:
MAR 0 7 2008
BUILDING &
Environmental Resources Management (ERM)
6455 S Yosemite St. Ste. 900
Greenwood Village, Colorado 80111-4954
Chevron North America Exploration and Production
Paul D. Kiteck, P.E. (primary author)
Hoover & Keith Inc.
11391 Meadowglen, Suite D
Houston, Texas 77082
Hoover & Keith Inc.
Consultants in Acoustics and Noise Control Engineering
11391 Meadowglen, Suite D, Houston, TX 77082
Phone: (281) 496-9876
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
REPORT SUMMARY
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
This report includes the results of a preliminary acoustical assessment of the Chevron Piceance
Basin Natural Gas Development Project to be located primarily in Garfield County, Colorado,
which includes a Central Production Facility (i.e., a natural gas gathering/transmission compressor
station) along with booster compressors and several well sites that will include well drilling activities.
The primary purpose of the acoustical assessment is estimate the sound attributable to project
facilities that could generate noise, such as the Central Production Facility (CPF), compare the
results of the acoustical assessment to applicable sound criteria and assess the potential noise
impact of the project facilities. In addition, a limited amount of ambient sound tests were conducted
at the project site, and based on the measured ambient sound data, the ambient sound levels for the
area surrounding the project are 25 dBA to 35 dBA (typical ambient A -wt. sound level of 30 dBA).
At a distance of 1 mile south of the facility (in the area of the canyon, along Clear Creek Road), the
estimated sound contribution of the CPF during operation is 35 dBA. Consequently, at the closest
occupied residences to the CPF (i.e., homes at the intersection of Clear Creek Road & CR -204,
approx. 6 miles south of the CPF), the noise attributable to the CPF should be significantly lower
than the typical ambient sound level (e.g., 30 dBA), and therefore, the noise of the CPF should not
be audible at the closest residences to the CPF.
The estimated sound contribution of the CPF during operation at the closest "non -Chevron" property
of potential noise concern (Le., Colorado Nature Ranch; closest property line located approx. 4,000
feet west of the CPF) is 26 dBA, which is equal to or lower than the ambient sound level for this
area. Consequently, the "potential noise increase" of the ambient noise level at the closest non -
Chevron property (i.e., Colorado Nature Ranch) during full load operation of the CPF should be less
than 3 dB. As a result, the noise of the CPF may be slightly perceivable/audible at areas of the
Colorado Nature Ranch that are closest to the CPF but the noise of the CPF should have minimum
noise impact.
In regard to the Colorado 011 and Gas Conservation Committee (COGCC) Rules and Regulations,
the results of the acoustical assessment indicates that the noise attributable to the project facilities
(e.g., noise generated by the CPF and other noise -generating facilities) should be well below the
maximum permissible levels specified in the COGCC Rules and Regulations for this type of facility.
For reference, it is anticipated that any other facilities associated with the project, such as the
operation of booster compressors in the project area and/or well drilling operations on well pads, will
generate lower sound levels than the CPF during full load operation.
-Page i-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
TABLE OF CONTENTS
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
Page
1.0 INTRODUCTION 1
2.0 BRIEF DESCRIPTION OF THE SITE AND FACILITIES 1
3.0 SOUND CRITERIA, TYPICAL METRICS AND TERMINOLOGY 2
4.0 MEASUREMENT RESULTS, OBSERVATIONS AND METHODOLOGY 3
4.1 Measurement Equipment and Data Acquisition 3
4.2 Summary of the Measured Ambient Sound Levels and Observations 3
5.0 ACOUSTICAL ANALYSIS (CPF) 4
6.0 SUMMARY OF NOISE CONTROLS AND/OR EQUIPMENT NOISE LEVELS 6
6.1 Building Enclosing the Engines/Compressors 6
6.2 JW Cooler for Each Gas Compressor Unit 6
6.3 Turbine and Generator for Each Gen -Set 6
6.4 Exhaust of the Turbine for Each Gen -Set 6
6.5 Engine Exhaust and Engine Air Intake 6
7.0 SUMMARY AND FINAL COMMENT 7
APPENDIX: FIGURES, SOUND DATA, RESULTS OF ANALYSIS, DESCRIPTION OF ANALYSIS
METHODOLOGY, SOURCE OF SOUND DATA, COGCC REGULATIONS, TERMINOLOGY 8-23
Figure 1: "Overview" of Project Area, Areas of Interest & Sound Measurement Positions 9
Figure 2: "Closer" View of Area around CPF and Sound Measurement Positions 10
Figure 3: Conceptual Layout of Buildings and Equipment for the CPF 11
Description of the Analysis Methodology and Source of Data 12-13
Table A: Est'd Sound Contribution of the CPF during Operation at 1/2 Mile 14
Table B: Est'd Sound Contribution of the CPF during Operation at 1 Mile 15
Table C: Est'd Sound Contribution of the CPF at the Colorado Nature Ranch 15
Table D: Est'd Sound Contribution of the CPF at 350 Feet from the CPF Site Center 16
COGCC Noise Requirements (800 Series of the Rules and Regulations) 17-19
Summary of Metrics for Regulating Environmental Noise and Acoustical Terminology 20-23
-Page ii-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
1.0 INTRODUCTION
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
In this report, we include the results of a preliminary acoustical assessment of the Chevron
Piceance Basin Natural Gas Development Project to be located primarily in Garfield County,
Colorado. In addition, a limited amount of ambient sound tests were conducted at the project site
and a summary of the ambient sound tests are included. The primary purpose of the acoustical
assessment is estimate the sound attributable to project facilities that could generate noise,
compare the results of the acoustical assessment to applicable sound criteria and assess the
potential noise impact of the project facilities.
2.0 BRIEF DESCRIPTION OF THE SITE AND FACILITES
Figure 1 (Appendix, p. 9) shows an "overview" of the project area showing the general location
of project facilities, location of the ambient sound measurement positions and other areas of
interest. Figure 2 (Appendix, p. 10) shows a "closer view" of the primary project facilities (e.g.,
CPF and nearby well sites) and location of ambient sound measurement positions around the
area of the CPF.
The project is located primarily in Garfield County, Colorado, in the area of the Piceance Basin
(CO), approximately 16 miles NNW of DeBeque (CO). The land around the project is mostly
rough terrain/mountains with activities related to the gas exploration/transmission in the area, and
property for the project/area that is owned by Chevron is relatively large. In summary, the project
includes a Central Production Facility (CPF), which is a natural gas gathering/transmission
compressor station, booster compressors and several well sites that will include well drilling
activities.
The closest residences and other potentially noise -sensitive areas (e.g., Cowboy Chapel) not
located on Chevron property are approximately 6 miles south the CPF (i.e., near the intersection
of Clear Creek Rd. with CR -204). There are also a couple houses on the Chevron property
located along Clear Creek Road. The closest non -Chevron property of potential noise concern is
the area of the Colorado Nature Ranch, for which its closest property line is approximately 4,000
feet west of the CPF.
Figure 3 (Appendix, p. 11) shows the current preliminary layout of buildings/equipment for the
CPF. A total of three (3) engine -driven compressor units will be initially employed at the CPF for
natural gas gathering/transmission. Each compressor unit will consist of a Caterpillar (CAT)
Model G3520 engine driving a "high-speed" reciprocating gas compressor. The engines and
compressors for gas compressor units will be enclosed in an insulated metal building (Le.,
Compressor Building). The following describes auxiliary equipment and other notable equipment
at the CPF:
-Page 1-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
> Outdoor engine jacket -water (JW) air-cooled heat exchanger (i.e., JW cooler) for each main
gas compressor, each JW cooler is designed a vertical fan that are direct -driven by the
engine (i.e., via belts/sheaves), and the JW cooler will also function as a gas aftercooler;
> Exhaust engine system designed with an exhaust muffler system;
> Engine air intakes, which include an air filter/cleaner system;
> Aboveground gas piping and piping system components (e.g., inlet separators, fuel gas
scrubber, intermediate separator) along with other miscellaneous equipment.
> Three (3) Solar turbine -driven generator (i.e., 2 gen-sets typically operate and 1 gen-set
considered a spare), and the turbine and generator for each gen-set to be installed inside a
skid -mounted acoustical enclosure.
> Turbine exhaust for each gen-set will include an exhaust muffler.
There also will be a need to utilize booster compressor units (i.e., "smaller" engine -driven
compressor units) at or near some of the planned well sites. We understand that these booster
compressor units will each be designed with a skid -mounted acoustical enclosure covering the
engine -compressor for each package, and each package will include an outdoor engine JW/utility
cooler designed with a vertical fan that is direct -driven by the engine (i.e., via belts/sheaves).
3.0 SOUND CRITERIA. TYPICAL METRICS AND TERMINOLOGY
The Colorado 00 and Gas Conservation Committee (COGCC) regulate the oil and gas drilling
and production industry in the State of Colorado and the mission of the COGCC is to promote the
responsible development of Colorado's oil and gas natural resources The COGCC has the
responsibility for regulating noise from natural gas facilities in Colorado, and Series 800 (i.e.,
"Aesthetic and Noise Control Regulations"; Section 801 and Section 802) of the COGCC Rules
and Regulations address noise requirements (i.e., maximum allowable noise levels) for natural
gas facilities in the State of Colorado. The complete noise regulations given in the COGCC
Rules and Regulations are provided toward the end of the report (Appendix, pp. 17-19). The
following summarizes our interpretation of the noise requirements of the COGCC Rules and
Regulations as it applies to this project and the noise generated during operation of the CPF and
other project facilities (e.g., booster compressors or well drilling activities):
> In remote locations, where there is no reasonably proximate occupied structure or designated
outside activity area, similar to the area surrounding the site of the CPF or booster
compressor(s) for this project, the light industrial standard may be applicable. Consequently,
to comply with the COGCC noise regulations, it is assumed that the noise radiated at the
Chevron property line should not exceed a nighttime level of 65 dBA (i.e., between 7:00 PM
to the next 7:00 AM), and at the property line of any residential -zoned area (e.g., closest
residences), the noise generated by the CPF or booster compressors should not exceed a
nighttime sound level of 50 dBA (i.e., between 7:00 PM to the next 7:00 AM).
-Page 2-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
In addition, if the intruding noise (e.g., noise of CPF during operation) causes less than a 3 dB
increase in the overall ambient noise at nearby NSAs (i.e., defined as "potential noise increase"),
the noise should be barely audible/perceivable by the human ear and should have minimum
noise impact on the acoustical environment. If the intruding noise causes an increase in the
overall ambient noise of between 4 dB and 9 dB, the intruding noise may be audible by the
human ear but should still have minimum noise impact on the acoustical environment.
For the reader's information, a summary of applicable acoustical terminology in this report and
typical metrics used to measure and regulate environmental noise is provided at the end of the
report (Appendix, pp. 20 — 23).
4.0 MEASUREMENT RESULTS. OBSERVATIONS AND METHODOLOGY
4.1 Measurement Equipment and Data Acquisition
A limited amount of ambient sound measurements at the project site were performed by Paul
Kiteck of H&K during our site visit in the daytime January 29, 2008. At each sound measurement
position, the equivalentA-wt. sound level (i.e., Leq) and unweighted octave -band (O.B.) sound
pressure levels (i.e., SPLs) were measured at 5 feet above ground. Sound measurements
attempted to exclude "extraneous sound" such as cars or trucks passing immediately by the
sound measurement location or other intermittent sources not typical of the ambient noise
environment. The sound measurement system consisted of a Larson -Davis (LD) Model 2900
Real Time Analyzer/Sound Level Meter (a Type I SLM per ANSI Standard S1.4 & S1.11) and a
1/2 -in. condenser microphone with windscreen (analyzer/SLM calibrated with a LD Model CA250-
0493 microphone calibrator that was calibrated within 1 year of the service date).
4.2 Summary of the Measured Ambient Sound Levels and Observations
The following Table 1 summarizes the measured/reported ambient daytime A -wt. sound levels
(i.e., Leq) and some the sound measurement positions were taken relatively close to existing well
drilling activities. Note that the ambient daytime Leq (Le., also referred to as Ld) assumed to be
similar to or equal to the ambient nighttime A -wt. sound levels (i.e., Ln).
Meas.
Pos.
Description of Sound Measurement Location
Range of Meas'd
Daytime A -Wt. Sound
Levels (i.e., Ld)
Pos. 1
Area of a house on Chevron Property, located along Clear Creek Road.
26 to 35 dBA
Pos. 2
Area near the location of the CPF, along Toms Creek Road
28 to 32 dBA
Pos. 3
Along Clear Creek Rd, 600 feet east of well drilling operations at Well 598 -35 -AV
46 to 48 dBA *
Pos. 4
Approximately 250 feet south of well drilling operations at Well 598 -26 -AV
60 to 61 dBA *
Pos. 5
Approximately 300 feet south of well drilling operations at Wet 598 -35 -AV
58 to 59 dBA *
Table 1: Summary of the Meas'd Daytime A -Wt. Sound Levels at Areas of Interest for the Project
* Noise of the well drilling operations (i.e., drilling rig at the well site) was the dominate noise source.
-Page 3-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
During the site visit on Jan. 29 ('08), the meteorological conditions were as follows: Temperature
of 23 — 27 deg. F., mostly clear sky and there was a light wind primarily from the north. During
the daytime sound tests at the ambient sound measurement positions not located near well
drilling activities (i.e., Pos. 1 & Pos. 2), the audible noise sources that contributed to the ambient
noise included distant construction equipment, the sound of birds, the sound of wind blowing in
the trees/grass and at times, the noise of distant aircraft. We believe that the measured ambient
sound data at Meas. Pos. 1 and Meas. Pos. 2 represents the typically daytime and nighttime A -
wt. sound levels for the area during times of relatively low wind conditions. At measurement
positions located relatively close to well drilling activities (i.e., Pos. 3, Pos. 4 & Pos. 5), the noise
of the well drilling operations (i.e., drilling rig) was the dominant noise source.
In summary, based on the measured sound data at the site, the typical ambient sound levels for
the area surrounding the project are 25 dBA to 35 dBA, with a typical ambient A -wt. sound level
of 30 dBA. Consequently, if the resulting/predicted sound level contribution due to the operation
of project facilities is equal to or less than the typical ambient level (e.g., 30 dBA); the noise of
the CPF and other project facilities will probably not be audible.
5.0 ACOUSTICAL ANALYSIS (CPFt
The noise associated with the CPF during full load operation is considered the primary facility for
the project that could generate significant noise. In addition, the noise of booster compressors
during operation and well drilling activities could generate noise, but it is anticipated that other
project facilities, such as booster compressors and well drilling activities, will generate lower
sound levels than the noise associated with the CPF during operation. The estimated sound
contribution of the CPF assumes the operation of 3 gas compressor units and 2 gen-sets. The
acoustical analysis of the CPF considers the noise produced by all continuous -operating
equipment that typically would operate at the facility. The following stationary noise sources
associated with the CPF were considered significant:
D Noise generated by the engines/compressors that penetrates the Compressor Building;
D Noise of the engine exhaust of each gas compressor unit;
D Noise radiated from aboveground gas piping and associated components;
D Noise of the outdoor JW cooler for each gas compressor unit;
D Noise associated with the turbine exhaust of each gen-set (includes an exhaust muffler);
D Noise of the turbine/generator that radiates from the generator skid -mounted enclosure for
each operating gen-set.
For this acoustical analysis, we estimated the sound contribution of the CPF at different distances
(e.g., noise contribution at % mile and 1 mile south of the CPF, along the canyon, and at 350 feet
from the site) and at the closest area to the CPF of potential noise concern (i.e., Colorado Nature
Ranch). A detailed description of the methodology for the acoustical analysis and the source of
sound data for the CPF acoustical assessment are provided in the Appendix (pp. 12-13).
-Page 4-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
Table A (Appendix, p. 14) shows the spreadsheet calculation of the estimated A -wt. sound level
and unweighted O.B. SPLs at the a distance of approximately 14 mile south of the CPF (along the
canyon) as contributed by the CPF noise sources based on standard day conditions (i.e., no
wind, 60 deg. F., 70% R.H.) along with the estimated total noise of the CPF (i.e., noise of the
CPF plus the typical ambient noise). The analysis includes the effect of anticipated noise control
measures for the facility equipment.
Table B (Appendix, p. 15) is the spreadsheet calculation of the estimated A -wt. sound level and
unweighted O.B. SPLs generated by the CPF at the distance of approximately 1 mile south of the
CPF (along the canyon) as extrapolated from the estimated sound contribution at % mile (i.e.,
results in Table A).
Table C (Appendix, p. 15) is the spreadsheet calculation of the estimated A -wt. sound level and
unweighted O.B. SPLs generated by the CPF at the closest property line of the Colorado Nature
Ranch (i.e., approximately 4,000 feet west of the CPF) as extrapolated from the estimated sound
contribution at '% mile (i.e., results in Table A), noting that the Colorado Nature Ranch is
considered the closest non -Chevron area of potential noise concern.
For reference, Table D (Appendix, p. 16) shows the spreadsheet calculation of the estimated A -
wt. sound level and unweighted O.B. SPLs at the a distance of 350 feet from the site center of the
CPF (i.e., area of the Compressor Building) as contributed by the CPF noise sources, noting that
the Shiner Ridge (i.e., located between the CPF and Nature Ranch) will provide significant
attenuation of the CPF noise.
The following Table 2 summarizes the calculated/estimated A -wt. sound levels of the CPF
assuming operation of 3 CAT engine -driven reciprocating compressor units and other
continuous -operating equipment at the CPF.
Facility Operating Condition and Description of the Location
Est'd A -Wt. Sound
Level Contribution
of the CPF
Est'd sound contribution of CPF during operation at % mile from site center (along canyon)
43 dBA
Est'd sound contribution of the CPF during operation at 1 mile from site center (along canyon)
35 dBA
Est'd sound contribution of CPF at CO Nature Ranch (closest property line 4,000' west of CPF)
26 dBA
Est'd sound contribution of the CPF during operation at 350 feet from the site center
63 dBA
Table 2: Est'd A -Wt. Sound Level of the CPF at Several Distances and at the Closest Area to the CPF of
Potential Noise Concern (i.e., Colorado Nature Ranch).
-Page 5-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
6.0 SUMMARY OF NOISE CONTROL AND/OR EQUIPMENT NOISE LEVELS FOR PROJECT
The following section provides a summary of anticipated noise control measures and equipment
noise levels associated with the CPF equipment along with other assumptions or
recommendations that may affect the noise generated by the CPF during operation.
6.1 Building Enclosing the Engines/Compressors
Noise control measures will be applied to the building (Compressor Building) enclosing the
engines and compressors rather than to the equipment themselves. The following describes
specific requirements and other items related to the building components.
➢ The walls/roof will be constructed with an exterior metal skin, and it is recommended as a
minimum, employ 24—gauge metal. Building interior surfaces will be covered with insulation,
and it is recommended as a minimum, 6 -inch thick "high-density" mineral wool (6.0-8.0 pcf
uniform density), covered with a perforated liner.
6.2 JW Cooler for Each Gas Compressor Unit
Based on sound tests by H&K of the JW cooler for the gas compressor unit, the A -wt. sound
level is approximately 72-74 dBA at a distance of 50 feet.
6.3 Turbine and Generator for Each Gen -Set
The turbine and generator, which is directly driven by the turbine, for each gen-set will be
installed in a Solar acoustical skid -mounted enclosure, typically designed to achieve an A -wt.
sound level of approximately 85 dBA at 3 feet from the enclosure during operation of the gen-set.
6.4 Exhaust of the Turbine for Each Gen -Set
The muffler for the turbine exhaust of each gen-set will be a Solar Model AX -5530 dissipative -
type muffler with an overall length of 228 inches (i.e., 19 feet, from ground to stack exhaust
flange) and diameter of 72 inches (i.e., 6 feet).
6.5 Engine Air Intake and Engine Exhaust
The engine exhaust for each gas compressor unit will include a "residential -grade" muffler, and
the engine air intake(s) for each gas compressor unit with include a "standard" air filter.
-Page 6-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
7.0 SUMMARY AND FINAL COMMENT
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
At a distance of 1 mile south of the facility (in the area of the canyon, along Clear Creek Road),
the estimated sound contribution of the CPF during operation is 35 dBA. Consequently, at the
closest occupied residences to the CPF (i.e., homes at the intersection of Clear Creek Road &
CR -204, approx. 6 miles south of the CPF), the noise attributable to the CPF should be
significantly lower than the typical ambient sound level (e.g., 30 dBA), and therefore, the noise of
the CPF should not be audible at the closest residences.
The estimated sound contribution of the CPF during operation at the closest "non -Chevron"
property of potential noise concern (i.e., Colorado Nature Ranch; closest property line located
approx. 4,000 feet west of the CPF) is 26 dBA, which is equal to or lower than the ambient sound
level for this area. Consequently, the "potential noise increase" of the ambient noise level at the
closest non -Chevron property (i.e., Colorado Nature Ranch) during operation of the CPF should
be less than 3 dB. As a result, the noise of the CPF may be slightly perceivable at areas of the
Colorado Nature Ranch that are closest to the CPF but the noise of the CPF should have
minimum noise impact.
For reference, it is anticipated that any other facilities associated with the project, such as the
operation of booster compressors in the project area and/or well drilling operations on well pads,
will generate lower sound levels than the CPF during full load operation.
In regard to the COGCC Rules and Regulations, the results of the acoustical assessment
indicates that the noise attributable to the project facilities (e.g., noise generated by the CPF and
other noise -generating facilities) should be well below the maximum permissible levels specified
in the COGCC Rules and Regulations for this type of facility.
As a final comment, to insure that the project facilities generate minimum noise impact, H&K will
provide review the noise -related equipment submittals and other design features (e.g.,
Compressor Building design) during the detailed design phase for the project.
Flle: WroMWordERM,Chevron Piceen a ProjectRepo,t - Noise Assessment for Chevron F ceencce Development Projectdoo
-Page 7-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
APPENDIX
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
> FIGURE 1: OVERVIEW LAYOUT AROUND THE
PROJECT SITE, AREAS OF INTEREST
AND SOUND MEASUREMENT POSITIONS
> FIGURE 2: CLOSER AREA LAYOUT AROUND THE
PROJECT SITE/CPF AND AMBIENT
SOUND MEASUREMENT POSITIONS
> FIGURE 3: CONCEPTUAL LAYOUT OF BUILDINGS &
EQUIPMENT FOR THE CPF
> ANALYSIS METHODOLOGY (NOISE ATTRIBUTABLE TO
THE CPF) AND THE SOURCE OF SOUND DATA
> ACOUSTICAL ANALYSIS (CFP)
> COLORADO OIL & GAS CONSERVATION COMMISSION
(COGCC) NOISE REGULATIONS (800 SERIES OF THE
RULES AND REGULATIONS)
> SUMMARY OF TYPICAL METRICS FOR REGULATING
ENVIRONMENT NOISE AND ACOUSTICAL
TERMINOLOGY
-Page 8-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
WELL SITE WELL SITE
598-26 WITH 598 -25 -
BOOSTER -/AREA OF
;COMPRESSOR - BOOSTER
PARCEL COMPRESSOR
POS. 3 ° �,, I- BOUNDARY I° WELL SITE
CLEAR 598 -25 -BV
_ CREEK RD. WELL SITE
WELL SITE �l (CR -211) --596-25-CV
1598-35 WITH
TOM CREEK RD.
BOOSTER
I COMPRESSORP05.2
\ / CENTRAL
PRODUCTION
BOUNDARY WITH l/FACILITY (CPF)
COLORADO
NATURE
RANCH L
WELL SITE
COLORADO NATURE / '; 36-1
RANCH BOUNDARY
APPROX. 4.000'
FROM CPF
LEGEND
- NON-RESIDENTIAL BUILDING
- HOUSE OR MOBILE HOME
NSA- NOISE SENSITIVE AREA
* - MEASUREMENT POSITION
* - WELL SITE
APPROXIMATE SCALE IN FEET
0 2700 5400
10800
SHINER
RIDGE __
SHINER
RIDGE
HOUSE ON
CHEVRON
PROPERTY CLEAR
CREEK RO.
(CR -211)
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
HINER GATE
(TEMPORARY
OFFICE)
CLEAR
CREEK
SHINER
RIDGE -->-
OTHER
HOMES
HOUSE ON
CHEVRON
PROPERTY
SHINER
RIDGE
CLEAR
CREEK
CLEAR
ROAN - -F CREEK RD.
CREEK RD. /r (CR -211)
(CR -204)
ROAN M \A' 'ROAN
CREEK Y - CREEK RD.
(CR -204)
CLOSEST
RESIDENCES
NOT ON
CHEVRON
PROPERTY
CLEAR
CREEK
-TREES
Figure 1: Chevron Piceance Development Project: "Overview" Layout Showing the Project
Facilities, Other Areas of Interest and Ambient Sound Measurement Positions.
-Page 9-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
WELL SITE
598-26 WITH
BOOSTER
COMPRESSOR
PARCEL
I BOUNDARY
POS. 4 (250' FROM\ I
WELL DRILLING RIG -
DURING OPERATION)
N,
CLEAR
(CR -211
I WELL WIT I�
/ �_ _ CREEK)RD.
TH
598-35
BOOSTER
COMPRESSOR p05.3
POS. 5 (300' FROM
WELL DRILLING RIG
DURING OPERATION)
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
WELL SITE
598 -25 -AV
AREA OF
BOOSTER r�
COMPRESSOR
WELL SITE __
593 -25 -BV
WELL SITE
599 -25 -CV
TOM CREEK
RD.
/ CENTRAL
PRODUCTION
FACILITY (CPF)
BOUNDARY WITH
COLORADO
NATURE
RANCH
COLORADO NATURE
RANCH BOUNDARY
APPROX. 4,000'
FROM CPF
LEGEND
- NON-RESIDENTIAL BUILDING
— - HOUSE OR MOBILE HOME
NSA- NOISE SENSITIVE AREA
- MEASUREMENT POSITION
- WELL SITE
APPROXIMATE SCALE IN FEET
1100 2200 4400
WELL SITE
z 361
SHINER
RIDGE
Figure 2: Chevron Piceance Development Project: "Closer' Area View of Project Facilities and
Area(s) of Interest and Sound Measurement Positions in the Area of the CPF.
-Page 10-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
TOM CREEK RD.
ji i_ COMMUNICATIONS
ELECTRICAL 1 1 TOWER
SUSTATION -,�J
I 1
ELECTRICAL 1 I
BUILDING I
1
CONTROL
BUILDING ' � -
1I }}
I U
VRU
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
TURBINE -DRIVEN
GEN -SET (TYP.) /
,—y
PUMPS
OHO
i O
O
o
DIKE
LIQUID
SEPARATOR
1-12I
CLEAR
CREEK RD.
(CR -211)
GAS
SEPARATOR
r1
GLYCOL
TOWER
1 ' GAS FUEL GAS
FILTER SKID
I
#1 #2
CENTRAL
PRODUCTION
FACILITY (CPF)
PIPE RACK
COMPRESSOR
BUILDING WITH
ENGINE DRIVEN
COMPRESSOR UNITS
PIPE RACK
GLYCOL
REBOILER / SURGE
SKID
FENCELINE
APPROXIMATE SCALE IN FEET
0 35 70 140
Figure 3: Chevron Piceance Development Project: Conceptual Layout of the Buildings and
Equipment at the Central Production Facility (CPF).
-Page 11-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
ANALYSIS METHODOLOGY (NOISE ATTRIBUTABLE TO CPF)
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
In general, the predicted sound level contributed by the CPF equipment was calculated as a function of
frequency from estimated unweighted octave -band (O.B.) sound power levels (PWLs) for each significant
sound source. The following summarizes the acoustical analysis procedure for the Station:
➢ Initially, unweighted O.B. PWL values of the significant noise sources were determined from
equipment manufacturer's sound data and/or actual sound level measurements performed by H&K at
similar type of equipment/components expected for this gas compressor facility.
> Then, expected noise reduction (NR) or attenuation in dB per O.B. frequency due to any noise control
measures, hemispherical sound propagation (discussed in more detail below*) and atmospheric
sound absorption (discussed in more detail below**) were subtracted from the unweighted octave -
band PWLs to obtain the unweighted O.B. SPLs of each noise source. Since sound shielding by
buildings can influence the sound level contributed at the NSAs, we also included the sound shielding
due to buildings, if appropriate. The sound attenuation effect due to foliage or land contour was not
considered in the analysis although there probably will be some attenuation due to foliage/trees.
➢ Finally, the resulting estimated unweighted O.B. SPLs for all noise sources associated with the
Station (with noise control and other sound attenuation effects) were logarithmically summed, and the
total O.B. SPLs for all noise sources were corrected for A -weighting to provide the estimated overall
A -wt. sound level contributed by the Station at the closest NSA. The predicted sound contribution of
the Station at the closest NSA was utilized to estimate the Station noise contribution at the other
nearby NSAs that are more distant that the closest NSA.
*Attenuation due to hemispherical sound propagation: Sound propagates outwards in all directions (i.e.,
length, width, height) from a point source, and the sound energy of a noise source decreases with
increasing distance from the source. In the case of hemispherical sound propagation, the source is
located on a flat continuous plane/surface (e.g., ground), and the sound radiates hemispherically (i.e.,
outward, over and above the surface) from the sound source. The following equation is the theoretical
decrease of sound energy when determining the resulting SPL values of a noise source at a specific
distance ("r") of a receiver from the estimated PWL values:
Decrease in SPL ("hemispherical propagation") from a noise source = 20*log(r) — 2.3 dB
where "r" is distance of the receiver from the noise source.
**Attenuation due to air absorption: Air absorbs sound energy, and the amount of absorption
("attenuation") is dependent on the temperature and relative humidity (R.H.) of air and frequency of
sound. For example, the attenuation due to air absorption for 1000 Hz O.B. SPL is approximately 1.5 dB
per 1,000 feet for standard day conditions (i.e., no wind, 60 deg. F. and 70% R.H.).
-Page 12-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
SOURCE OF SOUND DATA (CPFI
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
The following describes the source of sound data used for estimating the source sound levels and/or the
source PWLs for the CPF (e.g., engines/compressors and other equipment/components associated with
the compressor installation).
(1)
Estimated PWL values of equipment inside the building (i.e., engines, compressors and other
equipment inside the building) was calculated from sound data measured by H&K on a similar
type of compressor installation.
(2) Exhaust PWL values were calculated from field sound data measured by H&K on a similar type of
engines to be utilized at this facility. The DIL values for the exhaust muffler are generally lower
than the recommended values in order that the analysis incorporates a "margin of safety."
(3)
Noise radiated from aboveground piping is primarily a result the noise generated by the gas
compressors. Consequently, measurement of both near field and far field sound data on gas
piping is presumed to be an accurate method of quantifying the noise associated with the piping,
and estimated PWL values for piping in the analysis were determined from near field and far field
sound data by H&K on a similar type of compressor to that of the proposed compressor unit.
(4) The estimated PWL values for coolers (e.g., JW/aux cooler and gas cooler) were designated to
meet the design noise goal and the estimated PWL values for the cooler utilized in the acoustical
analysis assumes some noise associated with piping associated with the coolers. The noise
level for the cooler used in the acoustical analysis is generally higher than the sound level
requirement in order that the noise design analysis incorporates an acoustical "margin of safety."
In addition, there can be other noise associated with the cooler that is not directly related to the
operation of the cooler fans.
(5) The estimated PWL values for the engine air intake were calculated from measured sound data
in the field tests by H&K on similar engine that will be employed.
-Page 13-
ERM - Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
Source No.
& Dist (Ft)
Noise Sources and Other Conditions/Factors
associated with Acoustical Analysis
PWL or SPL in dB Per Octave -Band Center Frequency (Hz)
A -Wt.
31.5
63
125
250
500
1000
2000
4000
8000
Level
1)
PWL of Engines/Compressors inside Bldg. (3 Units) 112
115
120
118
118
116
118
118
115
124
Attenuation of the Building -6
-10
-16
-20
-22
-25
-30
-32
-32
NR of any Additional Noise Mitigation Measures 0
0
0
0
0
0
0
0
0
Misc. Atten. (e.g., Shielding or Land Contour) 0
0
0
0
0
0
0
0
0
2600
Hemispherical Radiation -66
-86
-66
-86
-66
-66
-66-66
-66
260D
Atm. Absorption (70% R.H., 60 deg F) 0
0
-1
-1
-2
-4
-8
-20
-36
2600
Source Sound Level Contribution - 40
39
37
31
28
- 21
14
0
0
29
2)
PWL of Unsilenced Engine Exhaust (1 Unit) 120
125
132
126
124
128
126
114
100
131
PWL of Unsilenced Exhaust for 3 Units (+5 dB) 125
130
137
131
129
131
131
119
105
136
Atten. of Noise Control (Exhaust Muffler) -16
-22
-30
-35
-38
-38
-35
—25
-20
NR of any Additional Noise Mitigation Measures 0
0
0
0
0
0
0
0
0
Misc. Atten. (e.g., Shielding or Land Contour) 0
0
0
0
0
— 0
. 0
0
0
2800
Hemispherical Radiation -66
-66
-66
-66
-66
-66
-86
-66
-66
2600
Atm. Absorption (70% R.H., 80 deg 9 0
0
-1
-1
-2
-4
-8
-20
-36
2600
Source Sound. Level Contribution 43
42
40
29
23
23
22
8
0
30
3)
PWL of JN9Utility Cooler for 1 Unit 110
112
108
105
102
98
95
92
88
104
PWL of All 3JW/Utility Coolers (+5 dB) 115
117
113
110
107
103
100
97
93
109
Atten. of Noise Control 0
0
0
IO G 0 O % M
0
0
0
0
0
NR of any Additional Noise Mitigation Measures 0
0
0
0
0
0
0
0
Misc. Atten. (e.g., Shielding or Land Contour) 0
0
0
0
0
0
0
0
2600
Hemispherical Radiation -66
-66
-66
-86
-66
-66
-68
-66
2600
Atm. Absorption (70% R.H., 60 deg 9 0
0
-1
-2
-4
-8
-20
-36
2800
Source Sound Level Contribution 49
- 51
48
39
33
26
11
0
40
4)
PWL of Unsilenced Turbine Exhaust of Gen Set (1 Um 120
123
120
123
127
119
112
104
98
126
PWL of Unsilenced Exhaust for 2 Units (+3 dB) 123
126
123
126
130
122
115
107
99
129
Atten. of Noise Control (Exhaust Muffler) -2
-5
-12
-22
-30
-30
-28
-25
-20
Misc. Atten. (e.g., Shielding or Land Contour) 0
0
0
0
0
— 0
0
0
0
2600
Hemispherical Radiation -66
-66
-66
-66
-66
-68
-66
-68
-66
2600
Atm. Absorption (70% R.H. 60 deg 9 0
0
-1
°.-2
-2
-4
-8
-20
-36
2600
Source Sound Level Contribution f 55
55
44
36
32
22
13
0
0
35
5)
PWL of Outdoor Gas Piping for All Compressor Units 105
104
102
100
98
95
92
90
88
101
NR of Noise Control 0
0
0
"` 0
0
0
0
0
0
Misc. Atten. (e.g., Shielding by Compr. Bldg.) 0
0
0
0
0
0
0
0
0
2800
Hemispherical Radiation -66
-66
-66
-66
-66
- -86
-66
-66
-66
2800
Atm. Absorption (70% R.H., 60 deg 9 0
0
-1
-1
-2
-4
-8
-20
-36
2800
Source Sound Level Contribution 39
38
35
33
30
25
18
4
0
31
6)
PWL of Turbine -Driven Gen Set(1 Unit) 104
97
98
97
100
96
96
92
85
102
PWL of 2 Gen Sets (+3 dB) 107
100
101
100
103
99
99
95
88
105
NR of any Additional Noise Mitigation Measures 0
0
0
0
0
0
0
100
0000)
0
Misc. Atten. (e.g., Shielding by Compr. Bldg.) 0
0
0
0
0
— 0
0
0
2600
Hemispherical Radiation -66
-66
-66
-66
-66
-66
-66
-86
2600
Atm. Absorption (70% R.H., 60 deg 9 0
- 0
-1
-1
-2
-4
-8
-36
2600
Source Sound Level Contribution 41
34
34
33
35
29
25
0
35
7)
PWL of Pumps, VRUs, Coolers, Glycol Regen. Skid 105
102
98
95
92
80
88
88
85
96
NR of any Additional Noise Mitigation Measures 0
0
0
0
0
0
0
0
0
Misc. Atten. (e.g., Shielding or Land Contour) 0
0
0
0
0
0
0
0
0
2800
Hemispherical Radiation -66
-66
-66
-66
-66
"-68
-66
-66
-66
2600
Atm. Absorption (70% R.H., 60 deg 9 0
0
-1
- -1
-2
-4
-8
-20
-36
2600
Source Sound Level Contribution 39
36
31
28
24.
20
14
0
- 0
26
Est'd Total Sound Contribution of CPF at 1t2 mile south of Site 66
57
50
45
42
36
30
15
0
4&1
Typical Ambient Sound Level at this Location
30.0
Est'd Sound Level of CPF plus Ambient Level (dBA)
43.3
IEst'd Potential Increase (dB)
13.3
Table A: Chevron Piceance Central Production Facility(CPF): Est'd Sound Contribution of the CPF at App tux.
112 Mile south of the Site (In the Area of Canyon) assuming Operation of Three (3) Compressor Units
(i.e., CAT Model G3520 Engine -Driven Compressor Units) and Two (2) Solar Gen Sets.
NOTE: DIL NR & PWL values on this spreadsheet analysis should riot be used as the specified values.
Refer to the "Noise Control & Sound Requirements" in the report or other company specifications.
-Page 14-
ERM - Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
Source No.
& Dist (Ft)
Noise Sources and Other Conditions/Factors
associated with Acoustical Analysis
SPL In dB Per Octave -Band Center Frequency (Hz)
A -Wt.
Level
31.5
63
125
250
500
1000
2000
4000
8000
5280
5280
Estd SPLs of Station at 2600 Ft. (RE: Table A)
Hemisph Radiation [209og(52802600) = 6dB]
Atm. Absorption (70% R.H., 60 deg F)
56
-6.0
0
57
-6.0
0
50
-6.0
-1
45
-8.0
-1
42
-6.0
-2
36
-8.0
-4
30
-6.0
-8-20
15
-6.0
0
-6.0
-37
43.1
Est'd Total Sound Contribution of CPF at 1 mile south of Site
50
50
43
38
34
26
16
0
0
35.1
Typical Ambient Sound Level at this Locaton
30.0
Est'd Sound Level of CPF plus Ambient Level (d BA)
36.3
IEst'd
Potential Increase (dB)
6.3
Table 8: Chevron Piceance Central Production Facility (CPF): Est'd Sound Contribution of the CPF at Approx.
1 Mile south of the Site (in the Area of Canyon) assuming Operation of Three (3) Compressor Units
(I.e., CAT Model G3520 Engine -Driven Compressor Units) and Two (2) Solar Gen Sets.
Source No.
& Dist (Ft)
Noise Sources and Other Conditions/Factors
associated with Acoustical Analysis
SPL in dB Per Octave -Band Center Freque cy (H )
A -Wt.
Level
31.5
63
125
250
500
1000
2000
4000
8000
4000
4000
Estd SPLs of Station at 2600 Ft. (RE: Table A)
Attenuation due to Shiner Ridge
Hemisph Radiation (201og(45002600) = 3.7 dB]
Atm. Absorption (70% R.H., 60 deg F)
56
-6
-3.7
0
57
-8
-3.7
0
50
-10
-3.7
0
45
-12.
-3.7
42
-14
-3.7
-1
36
-15
-3.7
-2
30
-18
-3.7
-4
15
'.-20
-37
-11
0
-20
-3.7
-19
43.1
Est'd Total Sound Contribution of the Station at NSA 93
47
45
36
29
23
15
4
0
0
26.1
Typical Ambient So nd Level at this Locaton
30.0
Est'd Sound Level of Station plus Ambient Ln (dBA)
31.5
IEst'd
Potential Increase (dB)
1.5
Table C: Chevron Piceance Central Production Facility (CPF): Est'd Sound Contribution of the CPF at Approx.
4,000 Ft West of Site (CO Nature Ranch, West of Shiner Ridge) assuming Operation of Three (3) Comp r.
Units (i.e., CAT Model G3520 Engine -Driven Compressor Units) and Two (2) Solar Gen Sets.
-Page 15-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
Source No.
& Dist (Ft)
Noise Sources and Other Conditions/Factors
associated with Acoustical Analysis
PWL or SPL in dB Per Octave -Band Center Fr quency (Hz)
A -Wt
31.5
83
125
250
500
1000
2000
4000 8000
Level
1)
PWL of Engines/Compressors inside Bldg. (3 Units)
112
115
120
..118
118
118
118
118
115
124
Attenuation of the Building
-6
-10
-16
-20
-22
-25
-30
-32
-32
NR of Additional Mitigation Measures
0
0
0
: 0
0
0
0
0
0
Misc. Atten. (Shielding or Ground Effect)
0
0
0
0
0
0
0
0
0
350
Hemispherical Radiation
-49
-49
-49
- -49
-49
49
-49
-49
-49
350
Atm. Absorption (70% R.H., 60 deg F)
0
- 0
0
0
0
-1
-1
-3
-5
350
Source Sound Level Contribution
57
56
55
49
47
42
38
35
30
49
2)
PWL of Unsilenced Engine Exhaust (1 Unit)
120
125
132
126
124
126
126
114
100
131
PWL of Unsilenced Exhaust for 3 Units (+5 dB)
125
130
137
131
129
131
131
119
105
136
Atten. of Noise Control (Exhaust Muffler)
-16
-.-22
-30
-35
-38
-38
-35
-25
-20
NR of Additional Mitigation Measures
0
'- 0
0
0
0
0
0
0
0
Misc. Atten. (Shielding or Ground Effect)
0
0
0
0
0
0
0
0
0
350
Hemispherical Radiation
-49
-49
-49
-49
-49
49
-49
-49
-49
350
Atm. Absorption (70% R.H., 60 deg F)
0
0
0
0
0
-1
-1
-3
-5
350
Source Sound Level Contribution
` 60
59
58
47
42
44
46
43
32
51
3)
PWL of JWUtlity Cooler for 1 Unit
110
112
108
105
102
98
95
92
88
104
PWL of All 3 JW/Utility Coolers (+5 dB)
115
117
113
110
107
103
100
97
93
109
Atten. of Noise Control
0
0
0
0
0
0
0
0
0
NR of Additional Mitigation Measures
0
0
0
0
0
0
0
0
0
Misc. Atten. (Shielding or Ground Effect)
0
0
0
0
0
0
0
0
0
350
Hemispherical Radiation
-49
' -49
-49
-49
-49
49
-49
-49
-49
350
Atm. Absorption (70%R.H., 60 deg F)
0
` 0
0
-: 0
0
-1
-1
- -3
-5
350
Source Sound Level Contribution
66
88
64
61
58
54
50
46
40
60
4)
PWL of Unsilenced Turbine Exhaust of Gen Set (1 Unr
120
123
120
123
127
119
112
104
96
126
PWL of Unsilenced Exhaust for 2 Units (+3 dB)
123
126.
123
126
130
122
115
107
99
129
Atten. of Noise Control (Exhaust Muffler)
-2
-5
-12
-22
-30
-30
-28
-25
-20
Misc. Atten. (Shielding or Ground Effect)
0
0
0
0
0
0
0
0
0
350
Hemispherical Radiation
49
-49
-49
-49
-49
49
-49
-49
-49
350
Atm. Absorption (70% R.H., 60 deg F)
0
0
0
-2
0
-1
-1
-3
-5
350
Source Sound Level Contribution -
72
72
62
''. 53
51
43
37
31
26
53
5)
PWL of Outdoor Gas Piping for All Compressor Units
105
104
102
100
98
95
92
90
88
101
NR of Noise Control
0
0
0
0
0
0
0
0
0
Misc. Atten. (Shielding or Ground Effect)
0
0
0
0
0
- 0
0
0
0
350
Hemispherical Radiation
-49
-49
-49
-49
-49
49
-49
-49
-49
350
Atm. Absorption (70% R.H., 60 deg F)
0
0
0
0
0
-1
-1
r -3
-5
350
Source Sound Level Contribution
56
55
53
51
49
` 46
42
39
35
51
6)
PWL of Turbine -Driven Gen Set (1 Unit)
104
97
98
97
100
96
96
92
85
102
PWL oft Gen Sets (+3 dB)
107
100
101
100
103
99
99
95
88
105
NR of Additional Mitigation Measures
0
-. 0
0
0
0
0
0
0
0
Misc. Atten. (Shielding or Ground Effect)
0
0
0
0
0
'.. 0
0
0
0
350
Hemispherical Radiation
-49
-49
-49
.49
-49
49
-49
-49
-49
350
Atm. Absorption (70% R.H., 60 deg F)
0
0
0
0
0
-1
-1
-3
-5
350
Source Sound Level Contribution
58
51
52
51
54
50
49
44
35
56-'.
7)
PWL of Pumps, VRUs, Coolers, Glycol Regen. Skid
105
102
98
95
92
90.
88
86
85
96
NR of Additional Mitigation Measures
0
0
0
- 0
0
"0
0
0
0
Misc. Atten. (Shielding or Ground Effect)
0
0
0
0
0
0
0
0
0
350
Hemispherical Radiation
-49
-49
-49
-49
-49
-40
-49
' -49
-49
350
Atm. Absorption (70% R.H., 60 deg F)
0
-.. 0
0
- 0
0
-1
-1
-3
-5
350
Source Sound Level Contribution
56
53
49
46
43
41
38
35
32
46
Est'd Total Sound Contribution at 350 Ft. from the Compr. Bldg.
74
74
68
63
61
57
54
50
43
63.0
Table D: Chevron Piceance Central Production Facility (CPF): Estd Sound Contribution of the CPF at Approx.
350 Ft. from the Site Center (I.e., Com pr. Bldg.) assuming Operation of Three (3 Compressor Units
(i.e., CAT Model G3520 Engine -Driven Compressor Units) and Two (2) Solar Gen Sets.
NOTE: Muffler DIL & Equipment PWL values on this spreadsheet should not be used as the specified values.
Refer to "Noise Control Measures" section In report or other company specifications for actual specified values.
-Page 16-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
COLORADO OIL & GAS CONSERVATION COMMISSION (COGCC) NOISE
REQUIREMENTS (800 SERIES OF THE RULES AND REGULATIONS}
The COGCC regulates the oil and gas drilling and production industry in the State of Colorado and the
mission of the COGCC is to promote the responsible development of Colorado's oil and gas natural
resources. This "responsible development" balances efficient exploration and production of oil and gas
with the prevention of waste, protection of mineral owner's rights, and protection of public health, safety
and welfare and the environment. In Colorado, the COGCC has the responsibility for regulating noise
from oil and gas facilities.
AESTHETIC AND NOISE CONTROL REGULATIONS
(Rules related to Noise Regulations and Noise Abatement as of November 30, 2006)
801. INTRODUCTION
The rules and regulations in this section are promulgated to control aesthetics and noise impacts
during the drilling, completion and operation of oil and gas wells and production facilities. Any Colorado
county, home rule or statutory city, town, territorial charter city or city and county may, by application to
the Commission, seek a determination that the rules and regulations in this section, or any individual rule
or regulation, shall not apply to oil and gas activities occurring within the boundaries, or any part thereof,
of any Colorado county, home rule or statutory city, town, territorial charter city or city and county, such
determination to be based upon a showing by any Colorado county, home rule or statutory city, town,
territorial charter city or city and county that, because of conditions existing therein, the enforcement of
these rules and regulations is not necessary within the boundaries of any Colorado county, home rule or
statutory city, town, territorial charter city or city and county for the protection of public health, safety and
welfare.
802. NOISE ABATEMENT
a. The goal of this rule is to identify noise sources related to oil and gas operations that
impact surrounding landowners and to implement cost-effective and technically -feasible mitigation
measures to bring oil and gas facilities into compliance with the allowable noise levels identified in
subsection c. Operators should be aware that noise control is most effectively addressed at the siting and
design phase, especially with respect to centralized compression and other downstream "gas facilities"
(see definition in the 100 Series of these rules).
b. Oil and gas operations at any well site, production facility or gas facility, shall comply with
the following maximum permissible noise levels. Operations involving pipeline or gas facility installation or
maintenance, the use of a drilling rig, completion rig, workover rig, or stimulation is subject to the
maximum permissible noise levels for industrial zones. The type of land use of the surrounding area shall
be determined by the Commission in consultation with the local governmental designee taking into
consideration any applicable zoning or other local land use designation.
c. In the hours between 7:00 a.m. and the next 7:00 p.m. the noise levels permitted below
may be increased ten (10) db(A) for a period not to exceed fifteen (15) minutes in any one (1) hour
period. The allowable noise level for periodic, impulsive or shrill noises is reduced by five (5) db(A) from
the levels shown.
-Page 17-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
ZONE 7:00 am to next 7:00 om 7:00 pm to next 7:00 am
(Daytime) (Nighttime)
Residential/Agricultural/Rural 55 db(A) 50 db(A)
Commercial 60 db(A) 55 db(A)
Light industrial 70 db(A) 65 db(A)
Industrial 80 db(A) 75 db(A)
In remote locations, where there is no reasonably proximate occupied structure or
designated outside activity area, the light industrial standard may be applicable.
Pursuant to Commission inspection or upon receiving a complaint from a nearby property owner
or local governmental designee regarding noise related to oil and gas operations, the Commission shall
conduct an onsite investigation and take sound measurements as prescribed herein.
The following provide guidance for the measurement of sound levels and assignment of points of
compliance for oil and gas operations:
(1) Sound levels shall be measured at a distance of three hundred and fifty (350) feet from the
noise source. At the request of the complainant, the sound level shall also be measured at a
point beyond three hundred fifty (350) feet that the complainant believes is more representative of
the noise impact. If an oil and gas well site, production facility or gas facility is installed closer
than three hundred fifty (350) feet from an existing occupied structure, sound levels shall be
measured at a point twenty-five (25) feet from the structure towards the noise source. Noise
levels from oil and gas facilities located on surface property owned, leased or otherwise
controlled by the operator shall be measured at three hundred and fifty (350) feet or at the
property line, whichever is greater.
In situations where measurement of noise levels at three hundred and fifty (350) feet is
impractical or unrepresentative due to topography, the measurement may be taken at a lesser
distance and extrapolated to a 350 -foot equivalent using the following formula:
db(A)@DISTANCE 2 = db(A)@DISTANCE 1 —20 x Iog10(distance 2/distance 1)
(2) Sound level meters shall be equipped with wind screens, and readings taken when the wind
velocity at the time and place of measurement is not more than five (5) miles per hour.
(3) Sound level measurements shall be taken four (4) feet above ground level.
(4) Sound levels shall be determined by averaging minute -by -minute measurements made over a
minimum fifteen (15) minute sample duration if practicable. The sample shall be taken under
conditions that are representative of the noise experienced by the complainant (e.g., at night,
morning, evening, or during special weather conditions).
(5) In all sound level measurements, the existing ambient noise level from all other sources in the
encompassing environment at the time and place of such sound level measurement shall be
considered to determine the contribution to the sound level by the oil and gas operation(s).
-Page 18-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
d. In situations where the complaint or Commission onsite inspection indicates that low
frequency noise is a component of the problem, the Commission shall obtain a sound level measurement
twenty-five (25) feet from the exterior wall of the residence or occupied structure nearest to the noise
source, using a noise meter calibrated to the db(C) scale. If this reading exceeds 65 db(C), the
Commission shall require the operator to obtain a low frequency noise impact analysis by a qualified
sound expert, including identification of any reasonable control measures available to mitigate such low
frequency noise impact. Such study shall be provided to the Commission for consideration and possible
action.
e. Exhaust from all engines, motors, coolers and other mechanized equipment shall be
vented in a direction away from all occupied buildings.
f. All facilities within four hundred (400) feet of occupied buildings with engines or motors
which are not electrically operated shall be equipped with quiet design mufflers or equivalent. All mufflers
shall be properly installed and maintained in proper working order.
> For reference the following is a summary of the COGCC noise requirements as it applies to the CPF,
per H&K interpretation:
In remote locations, where there is no reasonably proximate occupied structure or designated outside
activity area, similar to the area surrounding the site of the CPF or booster compressor(s) for this
project, the light industrial standard may be applicable. Consequently, to comply with the COGCC
noise regulations, it is assumed that the noise radiated at the Chevron property line should not
exceed a nighttime level of 65 dBA (i.e., between 7:00 PM to the next 7:00 AM), and at the property
line of any residential -zoned area (e.g., closest residences) the noise generated by the CPF or
booster compressors should not exceed a nighttime sound level of 50 dBA (i.e., between 7:00 PM to
the next 7:00 AM).
-Page 19-
ERM - Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
SUMMARY OF TYPICAL METRICS FOR REGULATING ENVIRONMENTAL NOISE
AND ACOUSTICAL TERMINOLOGY RELATED TO THE REPORT
(1) Decibel (dB): A unit for expressing the relative power level difference between acoustical or
electrical signals. It is ten times the common logarithm of the ratio of two related quantities that
are proportional to power. When adding dB or dBA values, the values must be added
logarithmically. For example, the logarithmic addition of 35 dB plus 35 dB is 38 dB.
(2) A -Weighted Sound Level (dBA): The A -wt. sound level is a single -figure sound rating, expressed
in decibels (Re 20 µPa), which correlates to the human perception of the loudness of sound. The
dBA level is commonly used to measure industrial and environmental noise since it is easy to
measure and provides a reasonable indication of the human annoyance value of the noise. The
dBA measurement is not a good descriptor of a noise consisting of strong low -frequency
components or for a noise with tonal components. The A -weighted curve approximates the
response of the average ear at sound levels of 20 to 50 decibels. The following are the relative
response of A -weighted filter per octave band frequency, and a graph/curve is provided below
that shows a graphical representation of the A -wt. filter response per frequency (in Hz).
31.5
Hz
63
Hz
125
Hz
250
Hz
500
Hz
1,000
Hz
2,000
Hz
4,000
Hz
8,000
Hz
16,000
Hz
-39.4 dB
-26.2 dB
-16.1 dB
-8.6 dB
-3.2 dB
0 dB
+1.2 dB
+1.0 dB
-1.1 dB
-6.6 dB
RELATIVE RESPONSE,
I dB
10
0
-10
-20
-30
-40
50
16 31.5 63 125 250 500 1000 2000 4000 8000 16,000
FREQUENCY, Hz
-Page 20-
—�
B,C
N'N
B
A
16 31.5 63 125 250 500 1000 2000 4000 8000 16,000
FREQUENCY, Hz
-Page 20-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
(3)
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
C-Weiehted Sound Level (dBC): The C -wt, sound level is a single -figure sound rating, expressed
in decibels (Re 20 µPa), which correlates to the human perception of the loudness of sound in
excess of 85 decibels. The dBC level is commonly used to measure industrial and environmental
noise since it is easy to measure and provides a reasonable indication of the overall sound. The
difference between C and A -weighted sound levels provides and indication of the amount of
lower frequency sound energy. The following are the relative response of C -weighted filter per
octave band frequency, and a graph/curve is provided that shows a graphical representation of
the C -wt. filter response per frequency (in Hz), and the graph/curve above in Definition (2) shows
a graphical representation of the C -wt. filter response per frequency (in Hz).
31.5
Hz
63
Hz
125
Hz
250
Hz
500
Hz
1,000
Hz
2,000
Hz
4,000
Hz
8,000
Hz
16,000
Hz
-3.2 dB
-1.0 dB
-0.2 dB
0 dB
0 dB
0 dB
-0.2 dB
-0.8 dB
-3.0 dB
-8.5 dB
(4) Background or Ambient Noise: The total noise produced by all other sources of a given
environment in the vicinity of a specific source of interest, and includes any Residual Noise.
(5) Human Perception of Change in Sound Level
• A 3 dB change of sound level is barely perceivable by the human ear
➢ A 5 or 6 dB change of sound level is noticeable
➢ If sound level increases by 10 dB, it appears as if the sound intensity has doubled.
(6) Sound Pressure Level (Lp or SPL): Ten times the common logarithm to the base 10 of the ratio of
the mean square sound pressure to the square of a reference pressure. Therefore, the sound
pressure level is equal to 20 times the common logarithm of the ratio of the sound pressure to a
reference pressure (20 micropascals or 0.0002 microbar).
(7)
(8)
Octave Band Sound Pressure Level (SPL): Sound is typically measured in frequency ranges
(e.g., high-pitched sound, low-pitched sound, etc.) that provides more meaningful sound data
regarding the sound character of the noise. When measuring two noise sources for comparison,
it is better to measure the spectrum of each noise, such as in octave band SPL frequency
ranges. Then, the relative loudness of two sounds can be compared frequency range by
frequency range. As an illustration, 2 noise sources can have the same dBA rating and yet
sound completely different. For example, a high-pitched sound at a frequency of 2000 Hz could
have the same dBA rating as a much louder low -frequency sound at 50 Hz.
Daytime Sound Level (Ld) & Nighttime Sound Level (Ln): Ld is the equivalent A -weighted sound
level, in decibels, for a 15 hour time period, between 07:00 to 22:00 Hours (7:00 a.m. to 10:00
p.m.). L„ is the equivalent A -weighted sound level, in decibels, for a 9 hour time period, between
22:00 to 07:00 Hours (10:00 p.m. to 7:00 a.m.).
-Page 21-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
(9)
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
Equivalent Sound Level (Log): The equivalent sound level (Leq) can be considered an average
sound level measured during a period of time, including any fluctuating sound levels during that
period. In this report, the Leq is equal to the level of a steady (in time) A -weighted sound level that
would be equivalent to the sampled A -weighted sound level on an energy basis for a specified
measurement interval. The concept of the measuring Leq has been used broadly to relate
individual and community reaction to aircraft and other environmental noises.
(10) Day -Night Average Sound Level (Ldn): The Ldn is an energy average of the measured daytime Leq
(Ld) and the measured nighttime Leq (Ln) plus 10 dB. The 10 -dB adjustment to the Ln is intended
to compensate for nighttime sensitivity. As such, the Ldn is not a true measure of the sound level
but represents a skewed average that correlates generally with past sound surveys which
attempted to relate environmental sound levels with physiological reaction and physiological
effects. For a steady sound source that operates continuously over a 24-hour period and
controls the environmental sound level, a Ldn is approximately 6.4 dB above the measured Leq.
Consequently, a Ldn of 55 dBA corresponds to an Leq of 48.6 dBA. If both the Ld and Ln are
measured, then
n the Ldn is calculated using the following formula:
Ldn =101ogml 15104,no + 2410(k.m)no24
(11) L -Percent Sound Levels: The L percent levels (e.g., L50, L90 & L10) refer to the A -weighted sound
levels that are exceeded for 90, 50 and 10 percent of the time, respectively, during a sound
measurement period. For example, the 50 -percentile exceeded sound level is designated to as
L50 and is sometimes described as the median sound level. The range between the Lwand L90
values usually provides a good indication of the variability of the sound levels during the period of
measurement.
(12) Sound Level Meter (SLM): An instrument used to measure sound pressure level, sound level,
octave -band SPL, or peak sound pressure level, separately or in any combinations thereof. The
measured weighted SPL (i.e., A -Wt. Sound Level or dBA) is obtained by the use of a SLM having
a standard frequency -filter for attenuating part of the sound spectrum.
(13) Sound Power Level (Lw or PWL): Ten times the common logarithm of the ratio of the total
acoustic power radiated by a sound source to a reference power. A reference power of a
picowatt or 10'12 watt is conventionally used.
(14) Tone: A tone is a sound sensation -having pitch, which is a listener's perception of the
frequency (for example, the higher the frequency, the higher the pitch). For a measured
sound spectrum, a tone is represented as a "peak" in the spectrum curve. Noise that
contains significant tones is considered a tonal type of noise.
-Page 22-
ERM — Chevron Piceance Basin Natural Gas Development Project
Results of a Preliminary Acoustical Assessment for the Project
Hoover & Keith Inc.
H&K Job No. 4004
H&K Report No. 2205 (03/06/08)
(15) Relevant Standards, associated Standards Institute(s) and References
American National Standards Institute (ANSI): ANSI is the national coordinator of voluntary
standards development and the clearinghouse in the U.S.A. for information on national and
international standards.
American National Standards Institute (ANSI) 51.4: Specification for SLM:
Type 1 SLM: Sound level meters (SLM) that meet this specification have a tolerance
of +/- 0.5 dB from 22.4 to 11,200 Hz.
Type 11 SLM: Sound level meters that meet this specification have a tolerance of +/-
0.5 dB from 63 to 2,000 Hz and +/- 1.0 dB from 22.4 to 11,200 Hz.
ANSI S1.11-1971 (R-1976): Specifications for Octave, Half -Octave and Third -Octave Filter Sets.
Includes a method to convert SPLs in the "old octave bands" to SPLs in the "new octave bands'.
ASTM Standard E1014-84: Standard Guide for the Measurement of Outdoor A -Weighted Sound
Level. This guide covers the measurement of A -weighted sound levels outdoors at specified
locations or along particular site boundaries, using a general-purpose sound level meter.
End of Report
-Page 23-
MidContinent / Alaska SBU
Chevron North America
Exploration and Production
ISSUED FOR INFORMATION
URS PICEANCE BASIN DEVELOPMENT
Washington Division
10550 Richmond Avenue Houston, Texas 77042 (281) 529-3100
Date: FEB. 28, 2008
WATER MANAGEMENT POND AREA
Drawing: PBSR-59836DVF-CIV-LAY-URS-00000-00004
EXHIBIT
v4
CO
/ / /
J// '-
.7///�
/ / /
/� /-/ —
1'////////�%//�/// l// �J// l///r - /// // �/i
// / l i / /� /
'��%/moi/�j�/ii�jj�/i'��(�i�/ /i��//moi
z -,----=---;-----.--.-/-/-,V / � //// j/// /tom / ////i i/7-
/,-
//7.7„7,,;•„...,—,,,,
� \ ...--/-7.------
,--
---
/2://
7
/ 'ice/ �/
lr'�5%//
)1/,,_---4///-L;//
j/j j //
llfr �// /,r/////
)111 1!1Oil / �) Jl
/////1 S
(( / '1 1�) 1 ///
I1)1 /1/ /
//i� S i rl l ,,��i/
/ r ` V/ 3 �\ I //
1
1s 'f / /
I
1) (J )
/ / 1 r
/
/, 1 f
r/ /
J
/ ‚'/7
/4
i
1.
CONSTRUCTION
PRELIMINARY NOT F
- x0034 . 13 77012 - 10311 570-3100
8
/
ar
//� f�1 iv, '~. JJ
/
/h
IV
/- \
y
....... / ' — — — \ i/ ` ,
'mow ` c v�� /'.
..-..v�fr .--ice ��-�� --
r 1—
ao a
€s
3
Y
;
r)
LE
ae
3
8
a
sa11141,.n
f s c x
11111,111 � Il
5Nt..11
Lit
00
U
EXHIBIT
/a,
r i
/ //."/ 1 / /-- /,-/
// •/ i///_ � / J /
' / / J / I /
// / / ///lA �
�� \
\�
1
NSTRUCTIDN
U
r
CC
a
SI?
C9
C20
gfifi
r.
1
>-
2 _
—W
oma
J a
w = J
J
ot VI
CO
W C. —
a cn
U =
a1
ac
—=-----___,--.,--- � r
,..../i - -- -- /
}
S
5
8
a
1
1
r
Y
5
S
Y
x
5
i
5
C.
/
7/2.4/ ..N11111121�� �I 1 I lit` 10),1? ,l
a)on
ti