HomeMy WebLinkAbout011 - Stormwater Drainage ReportBozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
PACLAND Project #103933024 Page 1
Bozeman Discount Tire
5889 East Valley Center Rd
Bozeman, Montana 59718
Stormwater Drainage Report
6814 Greenwood Ave N. T 206.522.9510
Seattle, WA 98103 www.pacland.com
Prepared By: Luke Randles
Reviewed By: Bill Fortunato, P.E.
Prepared: August 2025
Revised: April 2026
04/03/2026
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TABLE OF CONTENTS
SECTION PAGE
TABLE OF CONTENTS ..................................................................................................................................... 2
SECTION 1 – PROJECT OVERVIEW ................................................................................................................. 3
FIGURE 1.0 – SITE LOCATION MAP ................................................................................................................................... 4
SECTION 2 – EXISTING SITE CONDITIONS ..................................................................................................... 5
SECTION 3 – EXISTING STORMWATER DRAINAGE CONDITIONS .................................................................. 6
TABLE 3.1 – PRE-DEVELOPED CONDITIONS ........................................................................................................................ 6
SECTION 4 – DEVELOPED STORMWATER DRAINAGE CONDITIONS .............................................................. 7
TABLE 4.1 – DEVELOPED CONDITIONS ............................................................................................................................... 7
TABLE 4.2 – PRECIPITATION EVENT INFORMATION ............................................................................................................... 7
SECTION 5 – CONVEYANCE ANALYSIS ......................................................................................................... 10
SECTION 6 – STORMWATER POLLUTION PREVENTION PLAN ..................................................................... 11
SECTION 7 – CONSTRUCTION SEQUENCE AND PROCEDURE ...................................................................... 12
SECTION 8 – REPORTS, STUDIES AND MANUALS ........................................................................................ 14
SECTION 9 – OTHER PERMITS ..................................................................................................................... 15
APPENDIX A – FIGURES ............................................................................................................................... 16
APPENDIX B – EXHIBITS ............................................................................................................................... 18
APPENDIX C – PLANS ................................................................................................................................... 21
APPENDIX D - CALCULATIONS ..................................................................................................................... 26
APPENDIX E – OPERATION AND MAINTENANCE ........................................................................................ 31
APPENDIX F – GEOTECHNICAL ENGINEERING STUDY ................................................................................. 48
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SECTION 1 – PROJECT OVERVIEW
Description of Property
The proposed development is in the City of Bozeman, Montana, and is bordered to the north by an
existing commercial motel and surface parking lot, on the south by a second existing commercial motel
and surface parking lot, on the east by a southbound off-ramp from I-90 and on the west by East Valley
Center Road. A Site Location Map has been provided in Figure 1.0.
The property is zoned B-2 (Community Business District) and is located on Lot 1 of minor subdivision No.
358B, Parcel TaxID RFG52005. The property is 2.41 acres and is generally undeveloped except for a
private driveway/access road along the west side. Existing easements encumbering the property
include, a 30-foot sewer, water and access easement and a 50-foot mutual access easement on the
north side of the site, a 30-foot sewer pipeline easement and a 20-foot wide utility easement on the
east side of the site, a 12-foot pedestrian access easement and a 20-foot utility easement on the west
side of the site and a 30-foot joint access easement and a 20-foot water pipeline access easement in the
middle of the site.
The project involves construction of an approximately 7,300 square foot commercial tire sales store
(Discount Tire) with associated driveways, drive aisles, parking, sidewalks, landscaping, utilities, and
stormwater management facilities. The existing 24-ft wide private driveway will be removed, realigned
and replaced. A new 8’ wide asphalt trail will be constructed west of the proposed private driveway
adjacent to E. Valley Center Rd.
Location
5889 E. Valley Center Rd.
Bozeman, Montana 59718
Section/Township/Range
SE 1/4, Section 26, Township 01 S, Range 05 E, P.M.M.
Parcel/Tax Lot
RFG52005
City, County, State
Bozeman, Gallatin, Montana
Governing Agency
City of Bozeman, Community Development
State or Federal Regulations (Design Criteria)
Montana Post-Construction Storm Water BMP Design Manual, 2017
Federal Highway Administration Urban Drainage Design Manual, 2024
Montana Department of Environmental Quality Circular-8, 2024
Montana Department of Transportation Hydraulics Manual, 2022
Drainage Basin
Gallatin River Watershed
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Figure 1.0 – Site Location Map
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SECTION 2 – EXISTING SITE CONDITIONS
Topography
The project site generally slopes from the southwest (elevation +/-4655’) to the north (elevation +/-
4650’), with slopes typically ranging from 1% to 18%.
Soil and Geotechnical Assessment
A geotechnical report was prepared for the project by Terracon, and has been provided in Appendix F.
The Web Soil Survey identifies two predominant soil types for this site. Most of the site is comprised of
Turner loam, 0 to 4 percent slopes. The remainder of the site is Meadowcreek loam, 0 to 4 percent
slopes. The geotechnical characterization of the on-site soils are summarized as follows:
Some areas of existing fill up to 1.5 feet deep. Lean clays to about 5.5 to 7.0 feet below existing grade.
Clayey to Silty, Well Graded Gravel below 5.5 to 7.0 feet. Groundwater observed at 6.0 to 7.5 feet below
ground surface during our exploration.
Native Vegetation and Soil Protection Areas (ground cover)
The existing site ground cover is earthen, lightly to moderately vegetated.
Environmentally Sensitive Features (critical areas)
There are no known critical areas within the project site nor in the immediate area surrounding the site.
Ground Water
Groundwater was encountered during geotechnical investigations at a depth of 6.0 to 7.5 feet below
ground surface. The proposed stormwater infrastructure will be located such that it has the necessary
vertical clearance from the groundwater table. The groundwater table could affect over excavation
efforts, especially for over excavation and replacement of lower strength soils. A temporary dewatering
system consisting of sumps with pumps or a more robust system with wellpoints and irrigation header
line may be necessary depending upon the time of year of construction and corresponding groundwater
levels to achieve the recommended depth of over excavation.
Site Access
Primary access to the site is provided by East Valley Center Road. East Valley Center Road is classified as
a principal arterial. There is an existing asphalt access road/driveway which provides access to the
project area and is shared with the existing developments to the north and south. There is an existing
asphalt pedestrian trail that abuts the property on the south side.
Land Use Controls
The property is zone B-2 (Community Business District). As the proposed use for the site is “Vehicle
Maintenance / Equipment Repair”, the project meets the allowable land uses and development
standards. Two percent of the site area will be dedicated to usable commercial open space. Of this
usable space a portion shall be dedicated to pedestrian-oriented open space.
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SECTION 3 – EXISTING STORMWATER DRAINAGE CONDITIONS
Upstream Analysis
There are no upstream basins that contribute significant runoff to the proposed development (however,
the development to the south discharges a portion of their surface parking lot to the swale located east
of the proposed development). The area to be developed is bound by commercial developments and
public roadways that provide their own stormwater management.
Downstream Analysis
No downstream analysis is required, as the proposed development will not discharge additional runoff
off-site, and stormwater runoff will be managed by a proposed on-site infiltration basin. No downstream
impacts are anticipated because of the proposed development.
In the mitigated condition, a network of curbs, gutters, catch basins, and underground pipes will collect
surface water runoff throughout the entirety of the proposed development. The runoff will be collected
and conveyed to an onsite infiltration basin. Since the stormwater management system accounts for
development of the project site, the system is expected to function as designed and no downstream
issues are anticipated.
Existing Site Hydrology
The project area is generally undeveloped except for a private driveway/access road along the west side.
There is an existing swale located on the east side of the site which collects and conveys stormwater
runoff from the subject property (and from the property to the south) to a collection area near the
northeast corner of the site. There is a second existing swale located on the west side of the site which
collects and conveys stormwater runoff from the subject property (and from the public right-of-way) to
a collection area near the northwest corner of the site. It is assumed that projects within the basin
typically rely upon on-site infiltration to manage stormwater runoff.
The project has been analyzed as a single basin. For the purposes of hydrologic modeling, the pre-
developed conditions shall be modeled as forested. The pre-developed conditions have been provided
in Table 3.1. An exhibit depicting the pre-developed conditions has been provided in Appendix B.
Table 3.1 – Pre-Developed Conditions
Land Cover Description Basin Area
Pavement (PGIS) 0.19
Landscaped Area (NPGS) 2.23
Total Project Area 2.41
*Note: Summation of land covers may not add up exactly to overall
areas due to rounding of each individual area.
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SECTION 4 – DEVELOPED STORMWATER DRAINAGE CONDITIONS
Developed Site Hydrology
Stormwater runoff from the proposed parking lot and drive aisles will be collected in catch basins and
directed toward a proposed on-site infiltration basin. Roof runoff will be collected and conveyed, via
subsurface piping, to the same infiltration basin. All stormwater runoff will be infiltrated on-site, with no
discharge to an existing storm drainage system (outside of emergency overflow conditions). The
developed conditions are shown below in Table 4.1. An exhibit depicting the developed conditions has
been provided in Appendix B.
Table 4.1 – Developed Conditions
Land Cover Description Basin A Area (AC) Sub-Basin A1 (AC) Sub-Basin A2 (AC)
Pavement (PGIS) 1.01 0.90 0.11
Roof (NPGIS) 0.17 0.17 0.00
Sidewalk (NPGIS) 0.14 0.08 0.07
Landscape (NPGS) 1.09 0.74 0.35
Total Project Area 2.41 1.89 0.52
*Note: Summation of land covers may not add up exactly to overall areas due to rounding of each individual area.
Proposed Hydrologic Analysis Methodology
The General Permit requires that all regulated projects implement BMPs that are designed to infiltrate,
evapotranspire, and/or capture for reuse the post-construction runoff generated from the first 0.5
inches of rainfall from a 24-hour storm preceded by 48 hours of no measurable precipitation.
Per the City of Bozeman Design and Construction Standards Table 6.5.1, the storm events described in
Table 4.2 shall be used in the proposed hydrologic analysis:
Table 4.2 – Precipitation Event Information
Storm Event Precipitation (IN)
2-Year, 24-Hour 1.18
5-Year, 24-Hour 1.49
10-Year, 24-Hour 1.70
25-Year, 24-Hour 1.96
50-Year, 24-Hour 2.15
100-Year, 24-Hour 2.34
Runoff Reduction Volume (RRV)
In accordance with the Runoff Reduction Requirement, the runoff reduction volume (RRV) is the volume
of storm water runoff generated from the first 0.5 inches of rainfall from a 24-hour storm preceded by
48 hours of no measurable precipitation.
RRV=PRVA/12
RRV=Runoff Reduction Volume (acre-ft)
P=Water quality rainfall depth (use 0.5 inches)
RV=Dimensionless runoff coefficient=0.05+0.9(I)
I=Percent impervious cover
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A=Site drainage area (acres)
Basin A: RRV=0.5 * (0.05+0.9(0.55)) * 2.41 / 12 = 0.055 ac-ft = 2,384 CF
Sub-Basin A1: RRV=0.5 * (0.05+0.9(0.61)) * 1.89 / 12 = 0.047 ac-ft = 2,056 CF
Sub-Basin A2: RRV=0.5 * (0.05+0.9(0.33)) * 0.52 / 12 = 0.008 ac-ft = 327 CF
Permanent Water Quality Treatment
The water quality design storm shall be used to size post-construction (permanent) stormwater runoff
water quality treatment BMPs. Runoff treatment BMPs shall be sized based on the water quality volume
and flow rate to achieve the required treatment efficiencies. The design storm for post-development
water quality treatment shall be the 0.5-inch rainfall event.
Oil Treatment
Oil treatment facilities need only be located to treat stormwater which may contain oil and grease. The
proposed development will provide an oil/water separator for the service areas inside the building.
Metals Treatment
Metals are typically in the form of particles and are generally removed with basic treatment
requirements which remove total suspended solids. Therefore, properties requiring metals treatment
should already be treated through TSS treatment. No additional metals treatment will be provided.
Selection of Post-Construction BMPs
Per the Montana Post Construction Storm Water BMP Design Guidance Manual (Chapter 5.2.4), the
proposed project will utilize an infiltration basin that will infiltrate 100% of the stormwater runoff. As all
stormwater runoff will be infiltrated, no stormwater runoff will be discharged from the site under
normal conditions. An emergency overflow pipe is incorporated, which provides an overflow route for
the pond that directs stormwater to the natural point of discharge to the east side of the site.
Design and Sizing Procedure
The infiltration cell is the primary component of the facility where storm water runoff is captured,
treated, and released through infiltration. The infiltration cell volume will be 100 percent of
the RRV. The infiltration pond and swale have been sized to manage the 100-year runoff, estimated
based on the NRCS Runoff Method. Per the calculations shown in Appendix D, the total required volume
for the infiltration pond is 6,623 CF, and the required volume for the swale is 919 CF. The provided
volumes are 8,008 CF and 1,200 CF, thus exceeding the required volumes.
The bottom of the infiltration cell will be approximately 3,633 SF. The lowest measured percolation rate
in the area of the infiltration pond (per the geotechnical report in Appendix F) is 53.3 minutes per inch,
which converts to 1.13 inches per hour. Applying a 50 percent reduction to the infiltration rate per
Circular 8 results in a design infiltration rate of 0.565 inches per hour. The lowest elevation of the pond
(at the northern end) is 4646.93, which based on a top elevation of 4648.50 results in a maximum depth
of 1.57’. Based on these parameters, the pond drain-down time will be approximately 33 hours
(1.57*12/0.565=33.3).
Inlet and Conveyance
The infiltration basin is designed so that the inlet discharges into a pretreatment facility. The inlet
location was designed to dissipate flow energy to limit erosion and promote particle sedimentation.
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Pretreatment Forebay
A pretreatment forebay has been provided to allow larger particles to settle out prior to discharging
flows to the infiltration cell. The base of the pretreatment forebay should be lined with an impervious
geotextile.
Infiltration Cell Shape
The infiltration basin side slopes are 3:1 (H:V). One foot of freeboard is provided.
Infiltration Cell Bottom
The bottom slope of the infiltration cell is as follows: Lateral slope = 0 percent; Longitudinal slope 1
percent. No filter fabric liner has been provided on the bottom of the basin. Bottom of the basin is to be
a minimum of 2 feet in separation from the seasonal high groundwater (not including the lined
pretreatment forebay).
Outlet Structure
The proposed project will utilize an infiltration basin that will infiltrate 100% of the stormwater runoff.
As all stormwater runoff will be infiltrated, no stormwater runoff will be discharged from the site,
therefore an outlet structure is not required.
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SECTION 5 – CONVEYANCE ANALYSIS
Per the conveyance calculations in Appendix D, a 12” pipe sloped at 0.5% has a flow capacity of 2.94
CFS, and an 15” pipe sloped at 0.5% has a flow capacity of 5.32 CFS.
Storm drain conveyance has been evaluated based on the 10-year, 24-hour design storm with a time of
concentration of 5 minutes, based on rainfall intensity from the MDT Hydraulics Manual. Per the
calculations in Appendix D, the max flow generated for Sub-Basin A1 (utilizing the Rational Method) is
4.66 CFS, which is able to be conveyed via a 15” SD. This only occurs after multiple pipes are connected
– all other individual pipes of 12” are able to convey the individual sub-catchments.
Flood Control
Flood protection controls are designed based on a design storm with a specific return frequency that is
identified by local regulating jurisdictions. Generally, a 10- or 25-year return design storm is used to size
storm drainage infrastructure, and a 100-year return design storm is used to address upstream and
downstream flooding, including restrictions and backwater conditions. Since the infiltration facility has
been sized for the 100-year design event, no additional analysis is needed.
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SECTION 6 – STORMWATER POLLUTION PREVENTION PLAN
Per the City of Bozeman Construction Site Management Program - Best Management Practice (BMP)
Manual for Construction Sites, 2019, owners of multi-family, commercial, utility, demolition, and paving
projects with a total land disturbance greater than one acre must submit these documents to the City of
Bozeman and the Montana Department of Environmental Quality (MDEQ) for review and approval.
A stormwater pollution prevention plan (SWPPP) has been completed and submitted to the City of
Bozeman. The SWPPP contains effluent limitations, monitoring, and reporting requirements and details
temporary and final site stabilization requirements.
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SECTION 7 – CONSTRUCTION SEQUENCE AND PROCEDURE
1. Construction Sequence and Procedure
The proposed development will include an erosion/sedimentation control plan designed to prevent
sediment-laden run-off from leaving the site during construction. The erosion potential of the site is
influenced by four major factors: soil characteristics, vegetative cover, topography, and climate.
Erosion/sedimentation control is achieved by a combination of structural measures, cover measures,
and construction practices that are tailored to fit the specific site.
The contractor will be responsible for implementing the following erosion control and storm water
management control measures. The contractor may designate these tasks to certain subcontractors as
they see fit, but the ultimate responsibility for implementing these controls and ensuring their proper
functioning remains with the contractor. The order of activities will be as follows.
Phase 1
1. Prior to any construction work on the site, representatives from the authorized jurisdiction must
approve the storm water pollution prevention plan.
2. Mark clearing limits.
3. Install inlet protection to all existing catch basins.
4. Install perimeter fencing.
5. Begin clearing and grubbing operations. Clearing and grubbing done from October 1st through
June 30th is authorized as long as there are erosion and sediment control measures.
6. Commence site grading.
Phase 2
1. Disturbed areas of the site where construction activity has ceased for more than 30 days
between July 1 and September 30 or 15 days between October 1 and June 30 shall be
temporarily seeded and watered.
2. Install storm drainage and curbs.
3. Prepare site for paving. Finalize pavement subgrade preparation.
4. Remove inlet protection around inlets and manholes no more than 48 hours prior to placing
stabilized base course.
5. Install base material as required for pavement. Pave site. Do not pave over catch basins.
6. Complete final grading in non-parking areas and install permanent seeding and planting.
7. Remove fencing only after all paving is complete and exposed surfaces are stabilized.
2. Soil Stabilization
Temporary stabilization practices for this project include:
• Stabilization of disturbed areas immediately for any portion of the construction project that will
remain inactive for 14 or more calendar days with erosion control BMPs.
Structural practices for this project include the following. Refer to the Erosion Control plans for specific
locations and details:
• Inlet protection using fiber fabric.
• Temporary High-visibility construction fence
• Silt fencing
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• Temporary sediment trap
• Temporary interceptor swale
Daily inspection of the erosion control measures will be required during construction. Any sediment
buildup shall be removed and disposed of offsite at an appropriate disposal facility.
Vehicle tracking of mud off-site shall be avoided. If mud is tracked off site, it shall be swept and disposed
of offsite on a daily basis.
Because vegetative cover is the most important form of erosion control, construction practices must
adhere to stringent cover requirements. More specifically, the contractor will not be allowed to leave
soils open for more than 30 days between July 1st and September 30th and 15 days between October
1st and June 30th. Soils shall be stabilized at the end of the shift before a holiday or weekend if needed
based on the weather forecast. Applicable practices include, but are not limited to, temporary and
permanent seeding, sodding, mulching, plastic covering, and soil application of polyacrylamide.
3. Permanent Erosion Control and Site Restoration
Final stabilization practices for this project include:
• Use erosion control BMPs (including post construction BMPs) to stabilize disturbed areas within
any portion of the project that have completed clearing, grading, excavation, or other earth
disturbing activities. Please see site final stabilization in Appendix C.
Upon completion of the project, areas of the site that are not stabilized with paving, rooftops, or
landscaping as shown on the site plans will be protected with either grass, ground cover/plantings or
existing vegetation.
4. Inspection Sequence
The construction site operator will periodically inspect the site to evaluate how ESC measures are
functioning and shall install or repair BMPs as needed based on site conditions to ensure erosion and
sediment are controlled. Because the project does disturb more than one acre, a certified erosion and
sediment control lead will be required. After the completion of the project, the owner or other
responsible party shall conduct annual inspections of the facilities and shall maintain records of such
inspections for the life of the development. Inspection schedules are provided in Appendix E.
5. Control of Pollutants Other than Sediments
Pollutants shall be controlled on the work site through the utilization of a centralized area for
equipment. No significant pollutants are anticipated.
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SECTION 8 – REPORTS, STUDIES AND MANUALS
Per the Federal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) number
30031C0804D, the project is entirely located within Zone X, Area of Minimal Flood Hazard. As such, no
further analysis is required. A FIRMette (extracted from the FIRM based on project location) has been
provided in Appendix A.
The following Special Reports and Studies were used or have been completed for this project:
• Geotechnical Engineering Study, provided by ZipperGeo, dated June 24, 2025
• Operations and Maintenance Manual for proposed stormwater infrastructure (provided in
Appendix E).
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SECTION 9 – OTHER PERMITS
The following governmental approvals or permits will likely be required for this project:
• City of Bozeman Building Permit
• City of Bozeman Special Use Permit
• City of Bozeman Site Plan Review
• Montana Department of Environmental Quality (MDEQ) Notice of Intent
• Montana Department of Environmental Quality (MDEQ) Stormwater Pollution Prevention Plan
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APPENDIX A – FIGURES
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FEMA Flood Insurance Rate Map
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APPENDIX B – EXHIBITS
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APPENDIX C – PLANS
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APPENDIX D - CALCULATIONS
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STORAGE VOLUMES
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Peak Flows (Conveyance)
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Pipe Capacity
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APPENDIX E – OPERATION AND MAINTENANCE
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APPENDIX F – GEOTECHNICAL ENGINEERING STUDY
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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Bozeman Discount Tire Stormwater Drainage Report Bozeman, Montana
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