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VICINITY MAP
APPENDIX A
VICINITY MAP
A
7. REFERENCES
1. City of Fort Collins, "Storm Drainage Criteria Manual", (SDCM), dated June,
2001 and Ordinance 174 adopted in December 2011.
2. Urban Drainage and Flood Control District, "Urban Storm Drainage Criteria
Manual", Volumes I and 2, dated March, 1969, and Volume 3 dated September,
1992.
3. Old Town Master Drainage Plan Update by Anderson Consulting currently in
progress.
4. Drainage calculations for 800 Lemay Carwash and Tunex dated July 15, 1986 by
Stewart & Associates.
6) Groundwater and Stormwater Dewatering:
No groundwater encountered during soils exploration
therefore not anticipated to be an issue.
If groundwater is encountered a groundwater discharge permit shall be obtained and a
detailed report shall be completed describing the location and the route of where
pumped groundwater will be conveyed and the measures taken to prevent the transport
of any pollutants to downstream waters.
6. CONCLUSIONS
6.1 Compliance with Standards
All computations that have been completed within this report are in compliance with the
City of Fort Collins Storm Drainage Design Criteria Manual and the drainage
calculations for 800 Lemay Carwash and Tunex.
6.2 Drainage Concept
The proposed drainage concepts presented in this report and on the construction plans
adequately provide. for conveyance of runoff to the street or existing storm system. No
new storm conveyances are proposed on site.
If, at the time of construction, groundwater is encountered, a Colorado Department of
Health Construction Dewatering Permit would be required.
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minimize the transport of sediment (mud) by runoff or vehicles tracking onto the paved
surface. Any mud tracked to public roads shall be removed on a daily basis and after
any significant storm that causes sediment to be transported.
It is unlawful to track sediment/mud onto public streets and may be enforced by the City
of Fort Collins or by the State of Colorado.
5) Waste Management and Disposal:
Portable toilets will be anchored & periodically maintained by waste management
company. Dumpsters on site will be covered & periodically emptied by waste
management company. Concrete waste will be allowed to harden and then will be
removed from site.
No washing activities will occur on site.
Location of the concrete washout is shown on the site map. The washout will be
sufficiently deep to accommodate all anticipated concrete truck wash water. Waste
concrete will be allowed to harden and be removed from site periodically as the
washout reaches 50% of its capacity.
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2) Materials Handling and Spill Prevention:
Materials Handling & Spill
Approximate location on site
Applicable to this
Prevention BMP
Project
Portable toilets, anchored &
Refer to site map
X
located away from drainages
Fuel storage located in bulk tanks
with secondary containment &
spill kit
Mobile fueling performed at least
200 feet away from drainages &
Refer to site map
X
fully attended
Fertilizers, form oil, solvents,
cleaners, detergent stored in 55 gal
Refer to site map
X
or smaller containers, kept in
storage units
Dumpsters containing used
chemicals containers & liquid
Refer to site map
X
wastes kept covered
Equipment cleaning (on site) uses
no detergents & flows to onsite
retention basin
In case of a release of fuel or other
chemicals, absorbent booms or
earthen berms will be immediately
Location of spill
X
constructed to contain the spill &
prevent runoff to adjacent surface
waters
MSDS sheets for onsite chemicals
will be kept at the construction
Construction Trailer
X
trailer to facilitate spill response &
cleanup
3) Dedicated Asphalt or Concrete Batch Plant:
Not proposed with this development.
4) Vehicle Tracking Pad:
Vehicle tracking control pad shall be installed wherever construction vehicle access
routes intersect paved public roads. Vehicle tracking control pads shall be installed to
E
Non -Structural Practices for Erosion and Sediment Control:
Temyorary & Permanent non-structural BMP's:
Non -Structural BMP
Approximate location on site
Applicable to this
Project
Surface roughening
Entire site
X
Soil stockpile height limit (less
than 10')
Perimeter vegetative buffer
West boundary of site
X
Minimization of site disturbance
Entire site
X
Mulch
Seed & mulch stockpiles after 30
days
Stockpile toe protection (silt fence,
wattles or ditch)
Preservation & protection of
West bonndary of site
X
existing vegetation & trees
Good site housekeeping (routine
Entire Site
X
cleanup of trash & constr debris)
Heavy equip staged on site,
properly maintained & inspected
Staging area
X
daily (no onsite maintenance)
5.4 BMP Implementation
1) Phased BMP Implementation
BMP's are expected to change as the construction progresses and it is the responsibility
of the contractor to ensure appropriate BMP's are in place and/or removed at the
appropriate time in the construction sequence. All BMP's shall be inspected and
repaired or replaced as required to satisfy the conditions of the Stormwater Discharge
Permit. All BMP's must be maintained and repaired as needed to assure continued
performance of their intended function.
5.3 Best Management Practices (BMP's) for Stormwater Pollution Prevention
Structural Practices for Erosion and Sediment Control
Temporary & Permanent Structural BMP's:
Structural BMP
Approximate location on site
Applicable to this
Project
Silt Fence
Site perimeter, refer to site map
X
Straw bale dams
Wattles
At existing inlet
X
Earthen diversion dams
Vegetated swales
Sediment trap/pond
Pipe slope drains
Geogrid
Inlet/outlet protection
Existing inlet, refer to site map
X
Culverts
Riprap
Erosion control mats
Inlet protection
At inlets, refer to site map
X
5.2 Identification and location of all potential pollution sources
Potential Pollutant Source Activity
Potential Pollutant Generated
Applicable to
this project
Disturbed Areas
Sediment
X
Soil stockpiles
Sediment
X
Travel to adjacent public streets
Tracked sediment
X
Contaminated soils
Sediment, chemicals
Loading and unloading chemicals
Chemicals
Outdoor storage of chemicals
Chemicals
On site equipment maintenance
Oil, grease
On site equipment fueling
Diesel, gasoline
X
Dust generating activities
Particulates, sediment
X
Use of fertilizer, pesticides, herbicides
Fertilizer, pesticides
Use of detergents, solvents, oils
Detergents, solvents, oil
X
Waste dumpsters, waste piles
Chemicals
X
Concrete washout
Concrete, sediment
X
On site equipment washing
Detergents, oil
On site asphalt batch plant
Asphaltic cement, sediment
On site concrete batch plant
Cement, sediment
Portable toilets
Domestic sewage
X
4.3 Drainage Summary
All runoff from this site and the adjacent sites will be safely conveyed via surface flow to
the street or existing storm system. The site will maintain the drainage patterns that
currently exist on site.
The City of Fort Collins will be responsible for maintenance of the existing storm
drainage facilities located within the right-of-way. The drainage facilities located on the
site will be maintained by the property owner.
5. STORMWATER MANAGEMENT CONTROLS
5.1 SWMP contact information
Permit holder:
Name:
Address:
Phone Number:
Email Address:
Appointed agent:
Name:
Address:
Phone Number:
Email Address:
4
basins and Design Points associated with this site.
3.4 Hydraulic Criteria
No hydraulic calculations were completed for this site because the amount of runoff from
this site will not increase. It is assumed that the existing storm conveyances currently
operate adequately in storm events and this development will not impact the existing
operation.
4. DRAINAGE FACILITY DESIGN
4.1 General Concept
The runoff from this site will be collected in the flowpath in the asphalt and be conveyed
to Lemay Avenue or to the existing detention pond and inlet in the northeast corner of the
site. No runoff from this site will impact the adjacent properties.
4.2 Specific Flow Routing
A summary of the drainage patterns within each basin is provided in the following
paragraphs.
Basin 1 encompasses the majority of the lot at 816 South Lemay Avenue and the existing
Vet Clinic building. Very minor changes will be made to this lot and will include the
removal of some existing parking adjacent to Lemay to meet the parking setbacks. The
existing flow path is in the center of the asphalt which conveys runoff west and into
Lemay Avenue. This asphalt and flowpath will remain and runoff from this lot will
continue to flow to Lemay in the historic manner. The amount of asphalt will be
reduced, therefore the amount of runoff will be reduced.
Basins 2 includes the majority of the lot at 808 South Lemay Avenue which is the
existing carwash to be demolished. The building expansion will be located on this lot
and the existing parking lot will be reconfigured. Runoff from this basin historically
flows to an existing detention pond in the northeast corner of the lot. This detention pond
will be maintained and all runoff from the site will continue to flow to this detention area.
The amount of imperviousness in this basin will also be reduced, therefore the amount of
runoff anticipated will also be reduced with this proposed redevelopment.
3
2. DRAINAGE BASINS AND SUB -BASINS
2.1 Major Basin Description
The proposed development lies within the Old Town Drainage Basin.
2.2 Sub -basin Description
This site (800 Lemay) is included in the drainage calculations for "800 Lemay Carwash
and Tunex" by Stewart & Associates dated July 15, 1986, included in Appendix C of this
report.
3. DRAINAGE DESIGN CRITERIA
3.1 Regulations
This report was prepared to meet or exceed the "City of Fort Collins Storm Drainage
Design Criteria Manual" specifications. Where applicable, the criteria established in the
"Urban Storm Drainage Criteria Manual" (UDFCD), 1984, developed by the Denver
Regional Council of Governments, has been used.
3.2 Development Criteria Reference and Constraints
The runoff from this site has been routed to maintain the existing drainage patterns on
site. The Old Town Basin is normally required to detain to the 2 year historic runoff rate
but, because there is no increase in imperviousness proposed on this site, no detention
will be provided with this development.
3.3 Hydrologic Criteria
Runoff computations were prepared for the 10-year minor and 100-year major storm
frequency utilizing the rational method.
All hydrologic calculations associated with the basins are included in Appendix B of this
report. Standard Form 8 (SF-8) provides time of concentration calculations for all sub -
basins. Standard Form 9 (SF-9) provides a summary of the design flows for all Sub-
2
1. GENERAL LOCATION AND DESCRIPTION
1.1 Location
The existing Fort Collins Veterinary Emergency Hospital & Rehabilitation Clinic (Vet
Clinic) site is located on Lot 2, 800 Lemay Properties and the proposed expansion is
located on Lot 1, Lemay Ltd First Subdivision. This project is located in Section 18,
Township 7 North, Range 68 West of the Sixth Principal Meridian, in the City of Fort
Collins, Larimer County, Colorado. See the location map in Appendix A.
The project is located east of Lemay Avenue between Riverside Avenue and Elizabeth
Street. The project is bounded on all sides by existing commercial & retail development.
1.2 Description of Property
The entire site (both lots) consists of approximately 0.6 acres of land. The site at 816
Lemay is currently developed with asphalt drives and parking and a building that
contains the existing Vet Clinic. The site at 808 Lemay is currently developed with a car
wash building, a storage building, asphalt drives and parking. A majority of the existing
asphalt will be preserved with some reconfiguration to allow the site to meet minimum
parking setbacks. The existing care wash building will be demolished and the storage
building and vet clinic building will be preserved. Sidewalks on site will also be
reconfigured to accommodate the new parking and new building and to meet the arterial
street standards, providing a 10' parkway. The existing site at 816 Lemay currently
drains to the parking lot to a flow path in the asphalt which conveys the runoff to Lemay
through the drive access. The existing site at 808 Lemay currently drains to the shared
private drive on the north boundary of the site and flows east into an existing detention
pond which releases into an existing area inlet. None of the site appears to drain onto the
adjacent properties.
The site will continue to drain in the existing flow paths. The proposed development will
reduce the amount of imperviousness and will therefore reduce the amount of anticipated
runoff. No additional detention is proposed for this site.
TABLE OF CONTENTS
TABLE OF CONTENTS............................................................................................................... iii
GENERAL LOCATION AND DESCRIPTION
1.1 Location...................................................................................................................1
1.2 Description of Property............................................................................................I
2. DRAINAGE BASINS AND SUB -BASINS
2.1 Major Basin Description..........................................................................................2
2.2 Sub -Basin Description.............................................................................................2
3. DRAINAGE DESIGN CRITERIA
3.1 Regulations..............................................................................................................2
3.2 Development Criteria Reference and Constraints...................................................2
3.3 Hydrologic Criteria..................................................................................................2
3.4 Hydraulic Criteria....................................................................................................3
4. DRAINAGE FACILITY DESIGN
4.1 General Concept......................................................................................................3
4.2 Specific Flow Routing.............................................................................................3
4.3 Drainage Summary ..................................................................................................4
5. STORMWATER MANAGEMENT CONTROLS
5.1 SWMP Contact Information...................................................................................4
5.2 Identification and location of all potential pollution sources..................................5
5.3 Best Management Practices (BMP's) for Stormwater Pollution Prevention ........... 6
5.4 BMP Implementation...............................................................................................7
6. CONCLUSIONS
6.1 Compliance with Standards..................................................................................10
6.2 Drainage Concept..................................................................................................10
7. REFERENCES..................................................................................................................I I
APPENDICES
A Vicinity Map
B Hydrologic Computations
C Excerpts from Previous Reports
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North Star
design
700 Automation Drive. Unit I
Windsor. CO 80550
Phone:970-686-6939
Fax:970-686-1188
May 15, 2013
Glen Schlueter
City of Fort Collins Stormwater
700 Wood Street
Fort Collins, CO 80522-0580
RE: Final Drainage and Erosion Control Study for Fort Collins Veterinary
Emergency Hospital & Rehabilitation Clinic
Dear Glen,
I am pleased to submit for your review and approval, this Final Drainage and Erosion Control
Study for the Fort Collins Veterinary Emergency Hospital & Rehabilitation Clinic located at 816
Lemay Avenue and the proposed expansion onto 808 Lemay Avenue. I certify that this report
for the drainage design was prepared in accordance with the criteria in the City of Fort Collins
Storm Drainage Manual.
I appreciate your time and consideration in reviewing this submittal.
have any questions or renuire. clarification..-.
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' `�ttr_ �p0 REG�S,�
KRoF.F-p=
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Patricia Kroetch, P.E. �.••.ttt`
ii
Please call or email if you
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9
FINAL DRAINAGE AND EROSION
CONTROL STUDY
FORT COLLINS VETERINARY EMERGENCY
HOSPITAL & REHABILITATION CLINIC
Prepared for:
Hauser Architects
3780 E 15th St, Ste 201
Loveland, CO 80538
970-669-8220
Prepared by:
North Star Design, Inc.
700 Automation Drive, Unit I
Windsor, Colorado 80550
(970)686-6939
May 15, 2013
Job Number 346-01