HomeMy WebLinkAboutOFFICE AND LIGHT INDUSTRIAL ON TECHNOLOGY PARKWAY - FDP220007 - SUBMITTAL DOCUMENTS - ROUND 2 - STORMWATER MANAGEMENT PLANStormwater Management Plan for
5041 Technology Parkway
Fort Collins, Colorado
Prepared By
Aspen Engineering
June 8, 2022
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TABLE OF CONTENTS
DESCRIPTION PAGE
I. GENERAL LOCATION AND SITE DESCRIPTION
A. Location 3
B. Description of Property 3
C. Description of Construction Activity 4
D. Activity Sequence 4
E. Areas 5
F. Hydrologic Criteria 6
G. Existing Ground Cover & Soil Amendments 8
H. Potential Pollution Sources 8
I. Non-Stormwater Discharge 12
J. Receiving Water 12
II. SITE MAP 13
III. STORMWATER MANAGEMENT CONTROLS 13
A. Erosion and Sediment Control Measures 13
B. Installation and Removal Sequence of Control Measures 14
B. SWMP Administrator 15
C. Material Handling and Spill Prevention 16
IV. FINAL STABILIZATION AND LONGTERM STORMWATER MANAGEMENT 17
V. INSPECTION AND MAINTENANCE 18
VI. REFERENCES 20
APPENDIX A 21
DAILY STORMWATER MANAGEMENT PLAN LOG
VICINITY MAP
Erosion Control Plan (EX-001 - EX-003)
Erosion Control Notes & Details Sheet (EX-004 & EX-005)
Drainage Exhibit (C-010)
EROSION CONTROL ESCROW CALCULATION (Excerpt from Drainage Report)
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STORMWATER MANAGEMENT PLAN
FOR 5041 TECHNOLOGY PARKWAY
FORT COLLINS, COLORADO
I. GENERAL LOCATION AND SITE DESCRIPTION
A. Location
The 5041 Technology Parkway site is bounded to the north by Precision Drive, to
the east by Technology Parkway, to the south by Rock Creek Drive, and to the
west by the Eye Center of Northern Colorado and the Windsong Memory Care
Facility.
The project site can also be described as situated in the northwest quarter of
Section 4, Township 6 North, Range 68 West of the 6th P.M., of the City of Fort
Collins, Larimer County, Colorado (see vicinity map Appendix A).
B. Description of Property
The 5041 Technology Parkway project is comprised of an approximate 52,000 +/-
square foot building footprint along with associated parking lot, entry plazas and
outdoor site areas, and utility improvements, and a regional pond (Pond 501), all
of which is situated over approximately 6.72 acres and is contained within Lot 1
and Tract A, of the proposed development area.
The majority of existing topography of the 5041 Technology Parkway site (and
future development area) generally slopes from the northwest to southeast at
approximately 0.50% to 0.80%.
The site lies within the McClellands Basin. The site drainage has been previously
accounted for in the Harmony Technology Park Site Master Plan (HTPSMP) and
associated storm drainage improvements shown in the Mainstreet Health and
Wellness project, dated February 18, 2015. The project drainage will be in
conformance with these two studies, in which Masterplan information can be
found in the East Harmony Portion of the McClellands Creek Master Drainage
Plan (August 1999).
The 5041 Harmony Technology Park site being developed is comprised of 11.04
acres for the 5041 Technology Parkway site (Lot 1), regional detention pond 501
(Tract A), and the two future, residual lots (Lots 2 and 3), which are located west
of pond 501. An additional 1.29 acres of offsite basins OS9, OS12, and OS13,
shown in the Mainstreet Health and Wellness Suites drainage report, are also
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accounted for in this drainage study, thus providing for 12.33 acres of total basin
areas being conveyed to proposed regional pond 501.
C. Description of Construction Activity
The existing improvements at the 5041 Technology Parkway site consists of
fallow agricultural land, with an 18” storm sewer pipe, running along the south
portion of the site, that serves as an outfall from the Windsong development. An
existing sanitary sewer line and associated easement also exists along the western
boundary of Lot 2, and provides sewer service to the Windsong development.
Site infrastructure improvements will be constructed in a single phase. The initial
construction activities will include topsoil removal and stockpiling in existing
open spaces. Overlot grading of the site will occur for the new site parking lot,
building, and hardscaping landscaped areas. Demolition of existing asphalt, curb
and gutter will be performed for new access drives and utility construction within
existing streets. Excavation for proposed utilities and abandonment of existing
utilities will be performed as called for on Construction documents.
Construction of public infrastructure improvements will include construction of
underground utilities, storm drainage systems, parking lot and drive aisles.
Construction work includes trenching and installation of pipelines for water
service, sanitary sewer service, storm sewers, raingarden underdrains, and roof
drains; subgrade preparation; construction of new curbs and sidewalks; paving for
new parking lots and drives; signage and pavement striping; revegetation of
disturbed areas; and grading for raingardens, detention pond and swales.
Permanent and temporary Best Management Practices (BMP’s) will be
implemented, and revegetation of disturbed areas provided to minimize erosion
and the transport of sediment and pollutants from the project site.
D. Activity Sequence
The major activity sequence for the project will be as follows:
1) Installation of the required initial erosion and sediment control measures.
2) Clearing and grubbing of the lot within the limits of disturbance.
3) Topsoil excavation and stockpiling on-site.
4) Overlot grading for access drives, drive aisles, parking lot areas, and
building.
5) Excavation and grading for the detention pond, swales, and raingardens.
6) The required erosion control measures will be installed for the stormwater
system, swales, and storm inlets as they are constructed.
7) Demolition of curb and gutter, and asphalt for installation of utilities in the
public right-of-way.
8) Utility construction: trenching and installation of pipelines for water
service, sanitary sewer service, and storm sewer. Construction of storm
sewer inlets, raingarden underdrains, and water quality outlet structure.
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9) Building Pad, Access Drives, Drive Aisles, Sidewalks, and Parking Lot
construction: Subgrades will be excavated and prepared. Paving of drive
aisles, parking lots, curb and gutter, and sidewalks to be constructed.
10) Lighting, and signage and striping will be installed.
11) The required erosion control measures will be installed or updated, as may
be applicable.
12) Construction of the raingarden with bio-sand media, gravel, and perforated
underdrain system.
13) Stabilization, permanent seeding, mulching, sod, and other landscaping
will be installed.
14) Perform routine maintenance and inspections of BMP's after storm events.
15) Removal of control measures.
E. Areas
The 5041 Technology Parkway project is comprised of an approximate 52,000 +/-
square foot building footprint along with associated parking lot, drive aisles, entry
plazas, outdoor amenity areas, utility improvements, and a regional detention
pond (Pond 501), all of which is situated over approximately 6.72 acres and is
contained within Lot 1 and Tract A, of the proposed development area.
An additional 4.70 acres, situated west and north of Pond 501, will be subdivided
into two lots (Lots 2 & 3) for future development. The total area of the 5041
Technology Parkway project will account for approximately 11.04 acres being
conveyed to the proposed Pond 501, located north of Rock Creek Drive and south
of Precision Drive. A temporary staging area is anticipated to be placed in the
west parking lot and occupies an area of 5,000 sf. The estimated soil export is
6,431CY from the disturbed area.
The existing site improvements are within an area of approximately 6.72 acres.
The total area of disturbance will be 6.7 acres, is vegetated with native grass and
will be cleared and grubbed for grading. A temporary staging area is anticipated
to be placed in the west parking lot and occupies an area of 5,000 sf. The
estimated soil export is 6,431 cy. Stockpiled topsoil is expected to be placed
within the landscaped areas of the site. If there is any remaining topsoil, the
Contractor shall coordinate with the Owner to determine locations for placement.
Existing topsoil will be removed, stockpiled, and receive temporary seeding. The
topsoil removed from existing landscaped areas will be stockpiled within an
estimated footprint area of 29,300 sf. The stockpile is shown within the proposed
building footprint area. However, the contractor will coordinate with the Owner
and may modify this location.
Cleared areas will be overlot graded. Areas expected to be exposed for more than
30 days shall be temporarily revegetated to minimize erosion potential.
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The existing topography generally slopes from the northwest to southeast at
approximately 0.50% to 0.80%.
F. Hydrologic Criteria
The Final Drainage and Erosion Control Report for 5041 Technology Parkway,
dated April 27, 2022, is concurrently under review by the City of Fort Collins.
The report shall be followed and implemented. The project site is currently
fallow grass land with underground utilities constructed in existing utility
easements and drainage easements on the perimeter of the lot.
The 2-year and 100-year storm event intensities have been utilized to calculate
runoff and to size drainage structures, storm pipes, curb cuts, chases, riprap, and
erosion control fabric.
The proposed water quality/ detention pond (Pond 501) will have adequate
capacity, in accordance with the HTP SWMM Model, and will provide all the
required water quality and detention up to the 100-year event for the developed
condition of the subject site and offsite adjacent areas (up to a combined
impervious ratio of 67% for onsite parcel areas and associated, adjacent
roadways) (total of 12.33 acres), prior to releasing flows downstream.
The future development of adjacent lots will be required to meet the 80%
impervious ratio for the developed condition of the lots, rather than match the
rational ‘c’ values shown in the rational calculations.
Best Management Practices (BMP’s) for the treatment of stormwater will be
provided in the 5041 Technology Parkway site through the utilization of
raingardens constructed around the north, south and west sides of the lot to treat
the first flush runoff from impervious paved area and building roof area.
The composite developed runoff coefficient before construction is 0.25, and the
proposed site is 0.71 after construction.
The wind and rain erosion potential were evaluated using results from the USDA
Natural Resource Conservation Service, Web Soil Survey. Site soils are
classified as Nunn Loam. The soil water erosion K factor is 0.28 to 0.32, on the
scale ranging from 0.02 to 0.69, with the higher value indicating the most
susceptible to water erosion. Site soils are in the Wind Erodibility Group 6 on a
scale ranging from 1 to 8, with 1 being most susceptible to wind erosion.
Excerpts from the Web Soil Survey are provided below for reference.
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A subsurface soil investigation was performed by Terracon Consultants, Inc., a
qualified geotechnical consultant company, to determine the existing soil
characteristics. Please refer to the Geotechnical Engineering Report for MAVD
Flex Office, Fort Collins, Colorado, Project No. 20205032, dated October 22,
2020, for specific details. Refer to the “Water-Soluble Sulfate Test Results”
supplemental letter, dated November 2, 2020 for project concrete
recommendation for Exposure Class S0.
G. Existing Ground Cover & Soil Amendments
Currently the site is a fallow grass land with underground utilities around the
perimeter. Existing vegetation density is estimated at 60% coverage.
Soil Amendments:
Soil Amendments for the property are anticipated for the landscaping and planting
along and throughout green spaces/ open areas, lawns, parkways, and other
landscaped areas. Such soil amendment areas shall adhere to the approved
landscape plans and sections 12-130 through 12-132 of the City Code for such
soil amendments.
Sec. 12-132. Regulations (for Soil Amendments).
(a) Except as otherwise provided below, the holder of any building permit
shall, as a condition of the issuance of a certificate of occupancy, prepare
any area in which any plant materials, including but not limited to grass,
seed, flowers, shrubs or trees, are expected or intended to be installed,
prior to installation of any plant materials in that area, as follows:
(1) The soil in such areas shall be thoroughly loosened to a depth of not
less than eight (8) inches; and
(2) Soil amendments shall be thoroughly incorporated into the soil of such
areas to a depth of at least six (6) inches by tilling, discing or other
suitable method, at a rate of at least three (3) cubic yards of soil
amendment per one thousand (1,000) square feet of area to be planted,
unless at least four (4) inches of loose top soil has been placed on the area
after completion of construction activity on top of not less than four (4)
inches of loosened subgrade soils.
H. Potential Pollution Sources
The following potential pollution sources are identified below and measures are
suggested to protect stormwater quality and prevent contaminates from migrating
off-site. Refer to the SWMP exhibits for the location of BMP’s, stockpiled topsoil
areas, staging areas, waste storage, portable toilets, and site trailer. These
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locations are provided for guidance and may be repositioned based on site
conditions or Contractor preferences.
1. Disturbed and Stockpiled Topsoil
Approximately 6.72 acres of land will undergo clearing, grubbing, paved surface
removal and topsoil removal. Excavation will also be required for the detention
pond, raingardens, underground utility construction, parking lots and hardscaping.
Excavated topsoil will be placed in stockpiles not to exceed 10’ in height.
Stockpiles must be a minimum of 50 feet from storm sewer inlets and detention
pond. Provide temporary seeding and ample irrigation to establish vegetation on
topsoil stockpiles and on disturbed soil areas. Disturbed soil shall be maintained
in a roughened surface condition and graded with gentle slopes to enhance
infiltration and prevent concentrated runoff from occurring. Stockpiled soil shall
be temporarily seeded if stored more than 30 days. Installation of perimeter silt
fence around stockpiles, property boundaries and phase limits as necessary to
prevent migration of soil. Other BMP’s will include inlet gravel filters, and gravel
curb check bags at storm inlets, curb cuts, and curb and gutter locations.
Locations for stockpiled topsoil is identified on the Interim Phase Erosion Control
Plan exhibit. The Contractor shall coordinate with the Owner on final placement.
2. Vehicle Tracking of Sediments
A vehicle tracking pads shall be constructed at the north, south, and east project
entrances on Precision Drive, Rock Creek Drive, and Technology Parkway.
Vehicle tracking pads are designed to reduce the tracking of soil onto public
streets during construction. Soil tracked off-site onto paved roads shall be
scraped, collected, and disposed of properly. If tracking of soils offsite persists,
additional gravel paving of parking areas delivery areas and/or access routes may
be necessary to reduce tracking.
3. Management of Contaminated Soils
No contaminated soils have been identified on the parcel. If contaminated soils
are identified during grading, the areas should be marked and the Owner
contacted so a remediation plan can be implemented.
4. Loading and Unloading Operations
Delivery of site materials has potential for impacting runoff quality. Designated
areas for deliveries shall be established to safely load and unload materials.
Hazardous material delivered to site shall be covered and in sealed containers.
Contractor staging areas may be established to drive in and deliver materials on
graved surfaces to minimizing tracking soils offsite.
Unloading and Loading of construction materials shall be completed in a manner
to mitigate disturbance to existing soils and prepared soils to the extent possible
and as allowed within the normal means of construction. The contractor is
encouraged to provide specific loading and unloading areas to minimize heavy
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truck traffic disturbing prepared and existing soils, which could cause additional
erosion control measures being required for the site/project.
5. Outdoor Storage Activities
Hazardous materials such as fuel, solvent or fertilizer used on site shall be in a
secure covered area. Ample sorbent material and containment shall be available
to contain a spill.
6. Bulk Storage of Materials
Storage of bulk materials has potential for impacting runoff quality. Designated
areas for storage shall be established to safely store materials. Hazardous material
shall be covered and in sealed containers. Secondary containment must be used
for hazardous materials. Contractor staging areas and storage areas shall be
established to allow for access to materials on paved or graved surfaces to
minimizing tracking soils offsite.
7. Vehicle and Equipment Maintenance and Fueling
Heavy machinery will be operated on the project site requiring the use of fuel
trucks. Re-fueling operations and equipment maintenance shall be done in dry
weather conditions and on level ground to prevent and manage soil
contamination. Ample sorbent material and containment shall be available to
contain a spill. Day to day cleaning and maintenance of equipment has the
potential to impact stormwater quality. A designated area should be established
for refueling and maintenance with adequate separation from drainage paths and
ponds. Potential flow paths for spills shall be assessed prior to any fuel or
hazardous substance transfer. Secondary containment shall be implemented for
storage and transfer areas. Any storm drain conveyance within a containment area
shall be protected with berms or plugs. Washing of vehicles or equipment into the
storm drainage system is prohibited.
8. Significant Dust or Particulate Generating Processes
Provide regular watering operations to moisten soils and reduce fugitive dust
during dry conditions.
9. Routine Maintenance Activities
Stored fuel, solvent and fertilizer used on the site shall be in a secure covered
area. Fertilizers will be used to establish temporary and permanent vegetation
during and after construction. MSD sheets should be maintained on site and
posted. Storage bins, containers should be inspected regularly for evidence of
leakage or damage and measures take to fix or repair damage. Materials should
be securely transported when in use and applied or used as recommended by the
manufacturer.
10. On Site Waste Management Practices
Contractor staging areas, dumpsters, and waste receptacles shall be located at
least 50 feet from water courses and inlets, and on a level gravel surface to reduce
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generating dust and erosion in these high traffic areas. Perform routine
maintenance and dispose of waste promptly and properly off-site.
11. Concrete Truck/Equipment Washing
A concrete washout basin with liner or portable washout unit shall be provided at
least 50 feet from a water course or inlet, with such basin being determined by the
Contractor. The Contractor shall notify the Engineer and the City of Fort Collins
Erosion Control Inspector as to the location, size, and type of concrete washout
that will be utilized for the project. Wash fluids are to be contained with waste
product and disposed of properly off-site.
12. Dedicated Asphalt and Concrete Batch Plants
Concrete and asphalt batch plants will not be used on the project site. Premixed
paving materials will be delivered to the site and placed.
13. Non-Industrial Waste Sources
Portable toilets shall be located at least 50 feet from water courses and inlets, and
on a level gravel surface to reduce generating dust and erosion in these high
traffic areas. Perform routine maintenance and dispose of waste promptly and
properly off-site. Locations for trash and portable toilets are identified on the
Interim Phase Erosion Control Plan exhibit.
14. Saw Cutting and Grinding
Cutting of pavement or concrete and milling of asphalt is expected to occur on the
job site. Saw cutting and milling shall be conducted using water suppression to
reduce transport of dust during operations. Loose material shall be removed and
disposed of properly off-site. Provide watering to moisten loose dust and reduce
fugitive dust.
15. Dewatering Activities
A Colorado groundwater discharge permit will be required if dewatering becomes
necessary during construction. Contractor shall comply with State and Federal
regulations for discharging stormwater and groundwater.
16. Other Areas or Operation Where Spill Can Occur
No other areas or operations were identified specifically for this project. If other
areas or operations are implemented where a spill may occur, the contractor shall
implement hazardous waste management, implement spill response plans and
notification procedures.
Refer to Section III.C. Material Handling and Spill Prevention, for additional
details on controlling the potential pollution sources.
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I. Non-Stormwater Discharge
Firefighting activities on the site will be managed with Poudre Fire Authority. As
these conditions are not under direct control of the SWMP Administrator they
should be exempt from this plan. However, erosion control measures shall be in
place and maintained as practical during and after a fire fighting event. All
underground water utilities, sewer and storm must be constructed, tested and
approved prior to initiating construction of any buildings. Fire trucks will need to
have a paved or all-weather surface to support the fire fighting vehicles. All
surface erosion control measures must be installed and maintained during
construction. Inlet protection will be installed after the inlets are constructed to
protect them from sediment transport during firefighting activities or storm
events. Flow would be conveyed in swales, curb and gutter and the storm sewer
system directed to the constructed detention pond area. Erosion control measures
such as inlet protection and the pond outlet gravel filter shall be maintained until
the site is stabilized and vegetation established.
Prior to installation and approval of underground water utilities, portions of the
site will be bare earth or pavement surfaces. Fire hazards would include
construction vehicles, refueling areas and storage materials. Runoff from storm
events or firefighting will be routed across the surface to constructed raingardens
and the detention Pond 501 with erosion control measures in place. The
Contractor shall comply with the phased construction of raingardens as presented
on the construction documents.
Groundwater, as determined from the initial geotechnical drilling investigations,
was encountered at the time of drilling. Groundwater was measured at select
borehole locations during drilling, at approximately 18’ to 22’ below existing
grade. Observations represent groundwater conditions at the time of the field
exploration and may not be indicative of other times or at other locations from
where test borings were taken. Therefore, groundwater may or may not be
encountered during construction. The contractor shall have a NPDES permit in
the event groundwater is encountered during construction. The permitting may
take 45 days to complete.
J. Receiving Water
The 5041 Technology Parkway project lies within the City of Fort Collins
McClellands Basin. The McClellands Basin generally flows southeast to Fossil
Creek Reservoir Inlet Ditch and ultimately discharges to the Poudre River.
The proposed improvements for the 5041 Harmony Technology project will
increase the site impervious area and will be required to provide LID measures,
detention, and water quality volume. LID measures include raingardens installed
on the north, south, and west sides of the site to treat 75% of the site impervious
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area. A water quality control outlet structure will be constructed within detention
Pond 501 to provided extended detention before restricted release of the site
runoff from the project site.
II. Site Map
Site maps for this SWMP are represented on the Initial Erosion Control Plan (EX-001),
the Interim Erosion Control Plan (EX-002), the Final Erosion Control Plan (EX-003), and
the Erosion Control Notes and Details (EX-004 and EX-005) for site erosion controls.
Please refer Appendix A for these maps.
III. Stormwater Management Controls
A. Erosion and Sediment Control Measures
This project will implement various Best Management Practices (BMP's) for the
treatment of storm water runoff as outlined below. The location of BMP’s are
represented on the Site Map exhibits, with the following being implemented for the
project:
Structural Practices
• Silt fence
• Straw wattle check dams
• Drainage swales
• Gravel inlet filters and gravel bags
• Rock socks
• Geotextile fabric
• Vehicle tracking pad
Non-Structural Practices
• Roughened overlot grading with gentle slopes
• Preservation of existing vegetation
• Temporary and permanent seeding, sod, and crimped straw mulch
• Water application to suppress dust control
The potential for erosion will be minimized by preventing runoff from the site or run on
into the site, by implementation of erosion control measures prior to initiating
construction activity. The erosion control measures shall be maintained throughout the
construction period until final acceptance by the local jurisdiction. The potential exists
for erosion problems during construction but should be minimal after completion of 5041
Technology Parkway development.
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B. Installation and Removal Sequence of Control Measures
In the initial phase of construction, prior to grading operations and construction, the
structural erosion controls must be installed and vehicle tracking pads constructed at the
project entrances. A tracking pad will be constructed at the entrance/exit to the parking
lot on the north access drive, connecting to Precision Drive, at the east access drive,
connecting to Technology Parkway, and at the south access drive connecting to Rock
Creek Drive. Silt fence will be installed along the perimeter of the north, east, south, and
west boundary of the site improvements to prevent sediment from leaving the site. Silt
fence will also be installed behind the existing curb and gutter along Precision Drive and
Rock Creek Drive where proposed sidewalk will be constructed in the existing right-of-
way. Where silt fence is shown to cross hard surface areas, rock socks shall be utilized
for these areas, as may be applicable during construction. Curb inlet gravel filters and
gravel curb check bags shall be installed in the curb and gutter of parking lot drives and
at existing inlets receiving runoff from the site, draining outside the limits of disturbance
as shown on the Initial Erosion Control Plan (EX-001).
In the interim phase of construction, immediately after storm sewer improvements are
constructed, erosion control measures shall be installed and maintained. Curb inlet gravel
filters will be placed at proposed curb cuts, proposed storm inlets, and proposed sidewalk
chases to mitigate the build-up of sediment and transport of debris into existing streets
raingardens, detention pond, and downstream drainage systems. Geotextile fabric shall
be installed at concentration points (curb cuts) and in swales. Fabric shall be installed in
accordance with manufactures guidelines and recommendations. Riprap shall be
installed at storm outfall locations and curb cuts where designated on the construction
documents. The interim BMP measures are shown in the Interim Erosion Control Plan
(EX-002), to minimize erosion and increase soil stabilization during the construction of
improvements.
During the construction of the 5041 Technology Parkway improvements, the surface of
overlot graded terrain should be kept in a roughened condition until final preparation for
paving or landscaping. Existing vegetation should be preserved as much as possible. Soil
stockpiles shall not exceed 10 feet in height and shall receive temporary grass seeding to
establish vegetated cover. Temporary and permanent grass seeding must be initiated in
construction lasting 30 days or more to vegetate disturbed areas, as called for in the
approved drainage and erosion control report and erosion sheets, as well as the approved
landscape plans for the project.
Disturbed areas will be permanently landscaped or temporarily seeded and mulched
within 30 days of initial disturbance. Disturbed land should be revegetated with seed or
sod or crimp mulched as soon after grading as weather permits. This will provide the
opportunity for pollutants to settle out of the storm water runoff.
In the final phase of construction, the erosion and sediment controls must be maintained
until the site has uniform cover equivalent to 70% of the site. Cover may include
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vegetation in the interim condition. The final BMP measures are shown in the Final
Phase Erosion Control Plan (EX-003)
Disturbed areas not in a roadway or greenbelt area shall have temporary vegetation seed
applied within 30 days of initial disturbance. After seeding, a hay or straw mulch shall be
applied over the seed at a rate of 1.5-tons/acre minimum, and the mulch shall be
adequately anchored, tacked, or crimped into the soil. Those drives that are to be paved
as part of the 5041 Technology Parkway improvements must have a 1-inch layer of
gravel mulch applied at a rate of at least 135 tons/acre immediately after overlot grading
is completed. The pavement structure shall be applied within 30 days after the utilities
have been installed.
If the disturbed areas will not be constructed upon within one growing season, a
permanent seed shall be applied. After seeding, a hay or straw mulch shall be applied
over the seed at a minimum rate of 1.5 tons/acre, and the mulch shall be adequately
anchored, tacked or crimped into the soil. In the event a portion of the drives or parking
lot pavement surface and utilities will not be constructed for an extended period of time
after overlot grading, a temporary vegetation seed and mulch shall also be applied to the
roadway areas as previously discussed. Please refer to the approved landscape plans for
the seed, plant, shrub, and mulch types, as well as irrigation needs for the project.
C. SWMP Administrator
The Storm Water Management Plan (SWMP) shall be developed, implemented,
maintained, and revised under the direction of a single individual identified as the SWMP
Administrator for the project site. This contact will be available throughout the project as
the authority for management of the site stormwater quality.
SWMP Administrator: MAVD
580 Burbank Street
Suite 140
Broomfield, Colorado 80020
Caroline Smith
Phone: (303) 308-1200 (office)
Phone: (303) 888-6764 (mobile)
email: csmith@mavd.com
This SWMP may require modification to accurately reflect the actual field conditions.
Recommendations for changes shall be documented in the SWMP inspection reports.
SWMP revisions shall be made immediately after field changes. Revisions shall be made
as soon as possible, but within 72 hours after installation of new BMP's, materials or
methods of installation are made.
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D. Material Handling and Spill Prevention
Upon confirmation from the Contractor of the desired locations for fuel, equipment, and
materials storage, the SWMP Administrator shall record the location of potential
pollutants on the site map. Descriptions of the potential pollutants shall be added to the
SWMP log book.
The Contractor shall provide a Spill Prevention, Control, and Countermeasure Plan
(SPCC) for any petroleum product, chemicals, solvents, or other hazardous materials in
use, or in storage, at the work site. Work shall not be started until the plan has been
submitted to and approved by the Local Entity Engineer, Fire Department, State
Jurisdictional Entities, and the EPA, as applicable.
Spill Prevention, Control and Countermeasure Plan shall be developed and implemented
to establish operating procedures and the necessary employee training to minimize the
accidental releases of pollutants that can contaminate stormwater runoff.
The Spill Prevention, Control, and Countermeasure Plan shall contain the following
information:
1. Identification and contact information of the ECS and the Contractor and
2. CDOT spill cleanup coordinators.
3. Locations of areas on project site where equipment fueling and servicing
operations are permitted.
4. Location of cleanup kits.
5. Quantities of chemicals and locations stored on site.
6. Label system for chemicals and Materials Safety Data Sheets (MSDS) for
products.
7. Clean up procedures to be implemented in the event of a spill that does not enter
state waters or ground water.
8. Procedures for spills of any size that enter surface waters or groundwater, or have
the potential to do so.
9. CDOT’s Erosion Control and Stormwater Quality Guide (current edition)
contains Spill notification contacts and phone numbers required in the SPCC
10. A summary of the employee training provided. Information in items 1 through 8
shall be updated when it changes.
Measures should be undertaken to control building materials, waste, and disposal of
excess asphalt and concrete to ensure these materials do not enter waterways. Asphalt,
concrete, building materials, waste and cleanup by-products shall not be allowed to enter
the on-site curb inlets and storm sewer systems nor shall they be allowed to enter the
detention ponds. Measures shall be undertaken to remove excess waste products from the
site and dispose of these waste materials off-site in an appropriate manner.
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The Contractor shall inspect equipment and stored materials daily for leaks or spills and
take corrective action to repair such conditions. Pre-approved absorbent material and/or
containers shall be provided as preventative measures to avoid contact with soils or
pavement.
Any periodic refueling of earthmoving equipment on site shall be carefully controlled to
ensure these materials are not spilled on the site and will not enter the proposed detention
pond. In the event of a spill from the site into an on-site curb inlet or storm sewer
system, appropriate measures shall be undertaken immediately to contain spilled
pollutants and properly remove the spilled materials along with all contaminated soils and
prevent future spills from occurring. In addition, measures shall be undertaken to limit
off-site soil tracking of mud and debris spillage from vehicles leaving the site. Mud and
debris shall not be tracked along roadways nor allowed to enter any non-protected
drainage path.
The pollutant sources and suggested BMP measures are identified in Section H of this
plan, to protect stormwater quality and prevent contaminates from migrating off-site.
In the event of a spill, spill prevention procedures should be implemented and posted on
site. The Stormwater Management Plan Administrator is responsible for coordination
efforts and to serve as contact for reporting spills. Spills shall be reported to the
Stormwater Management Plan Administrator who will determine if the Colorado
Department of Public Health and Environment (24-hour spill reporting 877-518-5608)
or downstream water users need to be contacted. Training for cleanup procedures,
location of spill kits, and use of materials shall be provided, as well as posted locations
and procedures for properly washing out concrete trucks and equipment to prevent
discharges from the site.
IV. FINAL STABILIZATION AND LONGTERM STORMWATER MANAGEMENT
Following site construction, the goal is to achieve a stabilized cover condition to provide
long-term stormwater protection. Stabilization is quantified by achieving uniform cover
equal to 70% universal coverage within the limits of the work site. The post-construction
condition of the site will be that the majority of the site will be surfaced with concrete
walkways, concrete curbs, gutters and asphalt pavement. Stabilization should be fulfilled
as it relates to stability of soil because the hard surfaces constructed, and the permanent
landscaping features will virtually eliminate erosion from the site. Vehicle tracking pads
are to be removed as final pavement is placed. Permanent seeding with mulching shall be
installed over the remaining disturbed ground. Drainage ditches, pans, and culverts must
be cleaned of debris and sediment. Sediment and debris on paved surfaces shall be
removed and the surfaces swept clean. Eroded slopes or drainage paths shall be repaired
by backfilling. Remove all silt fences following establishment of permanent stable
vegetation to the satisfaction of the City of Fort Collins inspector.
Page 18 of 27
V. INSPECTION AND MAINTENANCE
Inspection and maintenance shall be undertaken at least every 14 days and within 24
hours of a precipitation event or snow melt, which may cause runoff to occur. Routine
maintenance inspections shall be conducted to ensure proper function of BMP's and to
identify areas in need of additional protection or maintenance. The inspection shall
include observation of the construction site perimeter and discharge points (including into
a storm sewer system), all disturbed areas, any areas used for material storage that are
exposed to precipitation, any areas used for washing of machinery, the vehicle tracking
pad, concrete washout, and any other erosion and sediment control measures, as well as
the inspection all silt fence, gravel curb check bags, inlet gravel filters, geotextile fabric,
and riprap. Structures shall be reset or repaired, as needed, and any excess sediment
deposits removed.
Structural BMP’s which are identified below, shall be maintained and repaired
throughout construction and inspected after every precipitation event and at regularly
scheduled inspection times.
Silt fence
Sediment and debris deposition higher than one-half the fence height, on the upstream
side of silt fence must be removed. Inspect fencing following storm events and as needed
to allow the erosion control structures to function effectively. Damaged fence must be
replaced or repaired as evident during regular inspections. Damage may be recognized as
a tear, hole, slumping, or under cutting of flow beneath the fence.
Drainage swales
Drainage swales shall be inspected for signs of rill erosion, sediment deposition and
maintaining the designed alignment. Eroded areas shall be backfilled and subgrade
compacted. If topsoil has been applied, new topsoil shall be added. Reseeding shall be
completed if swales had been revegetated.
Straw wattle check dams
Ensure check dams are adequately secured to the ground and properly aligned with the
direction of flow. Displaced check dams shall be reset in accordance with the standard
detail for installation. Accumulated sediment on the upstream side of the dam shall be
removed when the depth exceeds on-half the check dam height.
Gravel inlet filters and gravel curb check bags
Inspect inlet filters, and gravel curb check bags after each storm event and during
regularly scheduled inspections. Remove sediment deposits when the depth is one-half
the of the inlet protection height or when the protection no longer functions, whichever
comes first. Reset or reposition as necessary in compliance with the installation detail.
Geotextile fabric
Inspect geotextile fabric after each storm event and during regularly scheduled
Page 19 of 27
inspections. Look for voids under the fabric, loose or missing stakes and secure loose
sections. Replace sections which are damaged by tears or holes. Replaced sections shall
be installed in accordance with the manufacture’s recommendations.
Vehicle tracking pad
Inspect vehicle tracking pads after each storm event and during regularly scheduled
inspections. Rock lined tracking pads shall be revitalized with new rock when sediment
fills the voids and tracking of sediment is evident on the paved surface offsite. Streets
and downstream inlet protection shall be cleaned of sediment.
Hazardous materials such as fuel, solvent or fertilizer, used on site, shall be in a secure
covered area. An inspection log shall be kept up to date to record inspections, repairs,
maintenance and recommendations for updates to the SWMP. Additionally, any spills
shall be fully documented and include: (1) what the spill material was; (2) reason for
spill; (3) date, time of start and finish of spill, quantity, and location of spill, weather
conditions, and who was contacted, and how the spill was cleaned; (4) impact to
environment, and method of disposal of cleanup materials. A sample of the inspection
log is provided as an attachment to this plan.
All construction activities shall comply with the State of Colorado permitting process for
Stormwater Discharges Associated with Construction Activity. A Colorado Department
of Public Health and Environment (CDPHE) Permit will be required before any
construction grading can begin.
THIS SWMP MUST BE AMENDED TO REFLECT SITE CHANGES THAT
IMPACT THE EFFECTIVENESS OF BMP’S OR CHANGES IN THE TYPE OF
BMP’S USED. THE SWMP SITE MAP SHALL ALSO BE AMENDED AS
NEEDED TO REFLECT CHANGES WHICH INCLUDE BMP’S, STOCKPILES
LOCATIONS, ETC.
Page 20 of 27
REFERENCES
1. Geotechnical Engineering Report, MAVD Flex Office, Fort Collins, Colorado,
Project No. 20205032, dated October 22, 2020, by Terracon, Inc.
2. Final Drainage and Erosion Control Report for 5041 Technology Parkway, Fort
Collins, Colorado, dated April 27, 2022, by Aspen Engineering.
3. SWMP Guidance Preparing a Stormwater Management Plan (SWMP), Stormwater
Construction General Permit, Water Quality Control Division, CDPHE, revised June,
2011.
4. Fort Collins Stormwater Criteria Manual, December 2018.
Page 21 of 27
APPENDIX A
Page 22 of 27
STORM WATER MANAGEMENT PLAN FIELD INSPECTION
Project: 5041 Technology Parkway
SWMP Administrator: ______________________________________________
Inspector: _______________________ Date:____________ Time: _________
Title: __________________________
Weather: ________________________________
REASON FOR INSPECTION
___ Routine Inspection (14 day minimum)
___ Runoff Response Storm Start______ End_______ Duration ______
___ Snow Melt
SWMP MANAGEMENT
Estimated area of disturbance at time of inspection: ______acres or ________%
Is SWMP notebook located on site?_____
Are changes to the SWMP documents noted and approved? _______
Are the inspection reports retained in the SWMP notebook: _______
Are corrective actions from the last inspection completed? _______
Is a list of potential pollutants retained at the site? _______
BMP AND EROSION CONTROL INSPECTION ITEMS
For each item indicate: “Y” = In Use or “N” = Not used
EROSION CONTROL SEDIMENT CONTROL
______Straw Bale Dike ______Inlets Filters
______Pond Outlet ______Silt Fence
______ Erosion Control Fabric ______Vehicle Tracking Pad
______ Riprap Structures ______ Pond Sediment
______ Storm Pipe Outlets ______ Perimeter Control
______ Drainage Pans
______ Seeding
______ Mulching
______ Disturbed Surface/Roughening
MATERIAL HANDLING, SPILL PREVENTION, WASTE
MANAGEMENT AND GENERAL POLLUTION PREVENTION
______ Storage Areas
______ Stockpiled Materials
______ Concrete Washout
______ Sanitary Facilities
______ Street Sweeping
______ Waste Management
Page 23 of 27
CONSTRUCTION SITE ASSESSMENT AND CORRECTION ACTIONS
All erosion and sediment control practices identified in the SWMP shall be evaluated to
ensure that they are maintained and operating correctly. Identify the condition of the
BMP, using more than one letter if necessary: (I) Incorrect Installation; (M) Maintenance
is needed; (F) BMP failed to operate; (A) Additional BMP is needed; (R) Remove BMP.
Additional copies of this form may be used for additional items.
Location BMP Condition Corrective Action and
Preventative Measure Taken
Date
Complete
& Initials
CONSTRUCTION SITE ASSESSMENT
Provide Yes or No response for the following questions below.
Is there evidence of discharge of sediment or other pollutants from the site?
_________________
Has sediment or other pollutants discharging from the site reached state waters?
_____________
Describe the location of sediment/pollutants discharge
________________________________________________________________________
________________________________________________________________________
GENERAL NOTES
Page 24 of 27
INSPECTION CERTIFICATION
I certify under penalty of law that based on my inspection and observations documented
above, the information submitted is to the best of my knowledge and belief, true,
accurate, and complete. I am aware that there are significant penalties for submitting false
information, including the possibility of fine and imprisonment for knowing violations.
__________________________ ____________________ ________________
Inspector Signature Title Date
COMPLIANCE CERTIFICATION
Corrective action(s) has been taken, or where a report doesn't identify any incidents
requiring corrective action, the report shall contain a signed statement indicating the site
is in compliance with the permit to the best of the signer's knowledge and belief.
__________________________ ____________________ ________________
Inspector Signature Title Date
NOTE: Modifications to the SWMP must be updated immediately to reflect the
field conditions. SWMP Field Inspection forms shall be completed for each
inspection event. Changes noted on the Erosion Control Plan and/or Erosion
Control Notes and Details sheets shall be kept with the respective inspection form.
All inspection documentation and spill reports shall be filed on site and available for
review at any time.
Page 25 of 27
MATERIALS HANDLING
Item Delivered: Date:
Actions Taken:
________________________________________________________________________
SPILL REPORTING
Material Spilled:
________________________________________________________________________
Why Material was Spilled:
____________________________________________________________
Quantity: __________________________________________________________
Location: _______________________________________________________
Weather Conditions: ________________________________________________
Spill Start Time: ________________ Spill Stop Time: _____________________
Cleanup Method: ___________________________________________________
Disposal Method: ___________________________________________________
Enter N/A if item is not applicable to the site Stormwater Management Plan
Page 26 of 27
CONTACT INFORMATION/RESPONSIBLE PARTIES
Owner/Developer
MAVDevelopment
South State Commons I
2723 South State Street
Suite 250
Ann Arbor, Michigan 48104
Greg Copp Phone: (734) 604-8806
SWMP Administrator
MAVD
580 Burbank Street
Suite 140
Broomfield, Colorado 80020 Phone: (303) 308-1200 (office)
Phone: (303) 888-6764 (mobile)
Caroline Smith email: csmith@mavd.com
This SWMP Prepared by
Aspen Engineering
19 Old Town Square
Suite 238 Phone: (970) 419-4344
Fort Collins, CO 80524 email: johng@Aspen-Engineer.com
Civil Engineer
Aspen Engineering
John Gooch
19 Old Town Square
Suite 238 Phone: (970) 420-5345
Fort Collins, CO 80524 email: johng@Aspen-Engineer.com
Emergency Contacts
Poudre Fire Authority Emergency: 911
Administration Non-Emergency Phone: (970) 416-2891
102 Remington Street Fax: (970) 416-2809
Fort Collins, CO 80524
Permitting Agency
Colorado Department of Public Health and Environment (CDPHE)
Water Quality Control Division
WQCD-Permits P-B2 Phone: (303)692-2000
4300 Cherry Creek Drive South www.cdphe.state.co.us
Denver, CO 80246 24-hour spill reporting 1-877-518-5608
Page 27 of 27
Site Contractor
Company: __________________________________
Contact: _____________________ Phone: ________________________
Street: ______________________ Fax: ________________________
City, State Zip________________________________________________
email: ______________________________________________________
Site Sub-Contractor
Company: __________________________________
Contact: _____________________ Phone: ________________________
Street: ______________________ Fax: ________________________
City, State Zip________________________________________________
email: ______________________________________________________
Site Sub-Contractor
Company: __________________________________
Contact: _____________________ Phone: ________________________
Street: ______________________ Fax: ________________________
City, State Zip________________________________________________
email: ______________________________________________________
Site Sub-Contractor
Company: __________________________________
Contact: _____________________ Phone: ________________________
Street: ______________________ Fax: ________________________
City, State Zip________________________________________________
email: ______________________________________________________
Site Sub-Contractor
Company: __________________________________
Contact: _____________________ Phone: ________________________
Street: ______________________ Fax: ________________________
City, State Zip________________________________________________
email: ______________________________________________________
ZIEGLER ROADKECHTER ROAD
E. HARMONY ROAD / CR 38E
INTERSTATE 25PRECISION DRIVE
LADY MOON DRIVEROCK CREEK DRIVE
PROJECT SITETIMBERLINE ROADFOSSIL CREEK RESERVOIRTECHNOLOGY PKWYFOSSIL RIDGE
HIGH SCHOOL
VICINITY MAP
ASPEN
TECHNOLOGY PARKWAY
(85' ROW)PRECISION DRIVE(66' ROW)ROCK CREEK DRIVE(ROW VARIES)PROPERTY BOUNDARYUTILITY EASEMENT(REC. NO 20080041258)PROPERTY BOUNDARYPROPERTY BOUNDARYPROPERTYBOUNDARY427 LF SILT FENCEALONG NORTHCURB OF ROCK CREEK DRIVE610 LF SILT FENCE ALONG NORTHCURB OF ROCK CREEK DRIVE ANDEAST CURB OF TECHNOLOGY PKWY643 LF SILT FENCE ALONG SOUTHCURB OF PRECISION DRIVE ANDEAST CURB OF TECHNOLOGY PKWY1,634 LF SILT FENCE ALONG SOUTH CURBOF PRECISION DRIVE AND AROUNDOUTER WEST EDGE OF PROPOSED PONDDRAINAGE & UTILITY EASEMENT(REC. NO 20080041257)DRAINAGE & UTILITY EASEMENT(REC. NO 20080071164)LOT 1LOT 2LOT 3TRACT AGRADING & UTILITY EASEMENT(REC. NO. 20150029090)SANITARY SEWER EASEMENT(REC. NO. 20160048879)9' UTILITY EASEMENT(REC. NO. 2001085362)16' DRAINAGE EASEMENT(REC. NO. 20160049345)IPIPIPPT
OFFICE/
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TRAILER
F/ST
ASPEN0'SCALE: 1" = 30'30'60'SHEET No:PROJECT/ LOCATION:
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FORT COLLINS, COLORADO
INITIAL PHASE EROSION CONTROL PLANEX-00115JUNE 8, 2022100-004AGWAGWJRGNOTES: .1.PERIMETER SILT FENCE SHALL BE INSTALLED ALONGPROPERTY BOUNDARY, AND IS SHOWN OFFSET FROMPROPERTY BOUNDARY ON THIS PLAN FOR CLARITY.·PERIMETER SILT FENCE AROUND SITE = 2,888 LF2.ALL DISTURBED AREAS ARE TO BE SEEDED AND MULCHED.3.STOCK PILES SHALL NOT TO EXCEED 10' IN HEIGHT.4.ALL OFFSITE AREAS DISTURBED DURING CONSTRUCTION ARETO BE RE-VEGETATED AND RETURNED TO HISTORICCONDITION. STRAW WATTLES OR GRAVEL INLET FILTERS MAYBE INSTALLED (IF NECESSARY AND AS REQUIRED) ONEXISTING, OFFSITE/DOWNSTREAM INLETS.5.VEHICLE TRACKING PAD(S) LOCATIONS SHALL BE DETERMINEDBY THE CONTRACTOR, PRIOR TO CONSTRUCTION, AND SHALLBE INSTALLED ACCORDINGLY.6.SEE SHEET EX-004 & EX-005 FOR EROSION CONTROL NOTESAND DETAILS.7.NORTH AMERICAN GREEN C350 FABRIC WILL BE UTILIZED ATMINOR OUTFALL LOCATIONS SHOWN, WITH RIPRAP UTILIZEDWHERE LARGER STORM FLOWS WILL DISCHARGE TO THEPROPOSED DETENTION POND.8.PERMANENT STORMWATER CONTROL MEASURES SUCH ASRAINGARDENS, BIOSWALES OR BIORETENTION PONDS, SHALLBE CONSTRUCTED IN THE LAST PHASE OF CONSTRUCTION ONTHE SITE TO MINIMIZE THE POTENTIAL FOR SEDIMENTATION.9.NO DEBRIS OR MUD SHALL BE TRACKED ONTO ADJACENTSTREETS AND ANY TRACKING THAT DOES OCCUR, WILL BECLEANED IMMEDIATELY BY THE CONTRACTOR.LEGEND .INSTALL VEHICLE TRACKING PADINSTALL SILT FENCEINSTALL CONCRETE WASHOUTHAY OR STRAW DRY MULCH (1-5%)INSTALL 12" STRAW WATTLE CHECK DAMLIMITS OF DISTURBANCEINSTALL CURB INLET GRAVEL FILTERINSTALL AREA INLET GRAVEL FILTERPROPOSED DIRECTION OF SURFACE FLOWINSTALL ROCK SOCK FILTERINSTALL GRAVEL CURB CHECK BAGINSTALL NORTH AMERICAN GREEN C350PROPOSED MAJOR CONTOUR - 5 FT INTERVALPROPOSED MINOR CONTOUR - 1 FT INTERVALEXISTING MAJOR CONTOUR - 5 FT INTERVALEXISTING MINOR CONTOUR - 1 FT INTERVALVTCSFWIPIPGBMUCWORSGFEXISTING DIRECTION OF SURFACE FLOWINSTALL RIPRAP PROTECTION (TYPE M D =12")RR502526FOR THE MARKING OF UNDERGROUNDBEFORE YOU DIG, GRADE, OR EXCAVATECALL 2 BUSINESS DAYS IN ADVANCECENTER OF COLORADOCALL UTILITY NOTIFICATION1-800-922-1987MEMBER UTILITIES.TOTALONSITE AREADISTURBED(SF)292,723TOTALOFFSITE AREADISTURBED(SF)01.PROJECT WILL BE CONSTRUCTED IN A SINGLE PHASE.2.STORAGE/STAGING AREAS SHALL BE WITHIN THE AREA OF DISTURBANCE.3.NO HAUL ROADS OFFSITE ARE EXPECTED.4.HEAVY CONSTRUCTION TRAFFIC TO BE ROUTED IN COORDINATION WITH THE 5041 TECHNOLOGYPARKWAY PROJECT MANAGER, PRIOR TO START OF CONSTRUCTION.5.GROUNDWATER DEPTHS ARE BASED ON BORING INFORMATION COMPLETED FOR MAVD FLEXOFFICE, FORT COLLINS, COLORADO, BY TERRACON, PROJECT NO. 20205032, DATED 10/20/2020.6.SITE SLOPES SHALL BE NO GREATER THAN 4:1.7.NO RIPARIAN OR SENSITIVE AREAS ARE IDENTIFIED WITH THIS PROJECT.DISTURBANCEAT ANYONE TIME(%)100EXISTINGVEGETATIONDENSITY(%)60EXISTINGSOIL TYPELEAN CLAYW/ SAND &SANDYLEAN CLAYGROUNDWATERLEVEL(FT) 18'-22'MATERIALCUT/FILL(CF)6,431(NET CUT)PROJECT DETAILSFUEL & STORAGE LOCATIONTRASH LOCATIONPORTABLE TOILET LOCATIONTOPSOIL STOCKPILE LOCATION
TTT
TECHNOLOGY PARKWAY
(85' ROW)PRECISION DRIVE(66' ROW)ROCK CREEK DRIVE(ROW VARIES)PROPERTY BOUNDARYUTILITY EASEMENT(REC. NO 20080041258)PROPERTY BOUNDARYPROPERTY BOUNDARYPROPERTYBOUNDARYPROPOSED BUILDING427 LF SILT FENCEALONG NORTHCURB OF ROCK CREEK DRIVE610 LF SILT FENCE ALONG NORTHCURB OF ROCK CREEK DRIVE ANDEAST CURB OF TECHNOLOGY PKWY643 LF SILT FENCE ALONG SOUTHCURB OF PRECISION DRIVE ANDEAST CURB OF TECHNOLOGY PKWY1,634 LF SILT FENCE ALONG SOUTH CURBOF PRECISION DRIVE AND AROUNDOUTER WEST EDGE OF PROPOSED PONDDRAINAGE & UTILITY EASEMENT(REC. NO 20080041257)DRAINAGE & UTILITY EASEMENT(REC. NO 20080071164)INSTALL OUTLET GRAVEL FILTER(SEE DETAIL, SHEET C-007)LOT 1LOT 2LOT 3TRACT A15
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IPIPIPIPVTCVTCRSRSIPRSRSVTCRSRSRSRRRRRRGFGRADING & UTILITY EASEMENT(REC. NO. 20150029090)SANITARY SEWER EASEMENT(REC. NO. 20160048879)9' UTILITY EASEMENT(REC. NO. 2001085362)16' DRAINAGE EASEMENT(REC. NO. 20160049345)IPIPIPIPIPIPIPRR5' x 5'5' x 5'GFRR2.5' WIDE4' LONG2' DEEPRR2.5' WIDE4' LONG2' DEEP25' WIDE18' LONG2' DEEP20' WIDE50' LONG20' WIDE50' LONGIPIPRSRSPT
OFFICE/
CONSTRUCTION
TRAILER
F/ST MATERIALSTAGINGAREA(5,000 SF)9' WIDE7.5' LONG2' DEEP13' WIDE12' LONG2' DEEP10' WIDE10' LONG2' DEEPRR9' WIDE7.5' LONG2' DEEPRR9' WIDE7.5' LONG2' DEEPASPEN0'SCALE: 1" = 30'30'60'SHEET No:PROJECT/ LOCATION:
DRAWING:OFCHECKED BY:DESIGNED BY:DRAWN BY:DESCRIPTION OF REVISION:DATE:REVISED BY:APPROVED BY:REV. #
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FORT COLLINS, COLORADO
INTERIM PHASE EROSION CONTROL PLANEX-00225JUNE 8, 2022100-004AGWAGWJRGNOTES: .1.PERIMETER SILT FENCE SHALL BE INSTALLED ALONGPROPERTY BOUNDARY, AND IS SHOWN OFFSET FROMPROPERTY BOUNDARY ON THIS PLAN FOR CLARITY.·PERIMETER SILT FENCE AROUND SITE = 2,888 LF2.ALL DISTURBED AREAS ARE TO BE SEEDED AND MULCHED.3.STOCK PILES SHALL NOT TO EXCEED 10' IN HEIGHT.4.ALL OFFSITE AREAS DISTURBED DURING CONSTRUCTION ARETO BE RE-VEGETATED AND RETURNED TO HISTORICCONDITION. STRAW WATTLES OR GRAVEL INLET FILTERS MAYBE INSTALLED (IF NECESSARY AND AS REQUIRED) ONEXISTING, OFFSITE/DOWNSTREAM INLETS.5.VEHICLE TRACKING PAD(S) LOCATIONS SHALL BE DETERMINEDBY THE CONTRACTOR, PRIOR TO CONSTRUCTION, AND SHALLBE INSTALLED ACCORDINGLY.6.SEE SHEET EX-004 & EX-005 FOR EROSION CONTROL NOTESAND DETAILS.7.NORTH AMERICAN GREEN C350 FABRIC WILL BE UTILIZED ATMINOR OUTFALL LOCATIONS SHOWN, WITH RIPRAP UTILIZEDWHERE LARGER STORM FLOWS WILL DISCHARGE TO THEPROPOSED DETENTION POND.8.PERMANENT STORMWATER CONTROL MEASURES SUCH ASRAINGARDENS, BIOSWALES OR BIORETENTION PONDS, SHALLBE CONSTRUCTED IN THE LAST PHASE OF CONSTRUCTION ONTHE SITE TO MINIMIZE THE POTENTIAL FOR SEDIMENTATION.9.NO DEBRIS OR MUD SHALL BE TRACKED ONTO ADJACENTSTREETS AND ANY TRACKING THAT DOES OCCUR, WILL BECLEANED IMMEDIATELY BY THE CONTRACTOR.LEGEND .INSTALL VEHICLE TRACKING PADINSTALL SILT FENCEINSTALL CONCRETE WASHOUTHAY OR STRAW DRY MULCH (1-5%)INSTALL 12" STRAW WATTLE CHECK DAMLIMITS OF DISTURBANCEINSTALL CURB INLET GRAVEL FILTERINSTALL AREA INLET GRAVEL FILTERPROPOSED DIRECTION OF SURFACE FLOWINSTALL ROCK SOCK FILTERINSTALL GRAVEL CURB CHECK BAGINSTALL NORTH AMERICAN GREEN C350PROPOSED MAJOR CONTOUR - 5 FT INTERVALPROPOSED MINOR CONTOUR - 1 FT INTERVALEXISTING MAJOR CONTOUR - 5 FT INTERVALEXISTING MINOR CONTOUR - 1 FT INTERVALVTCSFWIPIPGBMUCWORSGFEXISTING DIRECTION OF SURFACE FLOWINSTALL RIPRAP PROTECTION (TYPE M D =12")RR502526FOR THE MARKING OF UNDERGROUNDBEFORE YOU DIG, GRADE, OR EXCAVATECALL 2 BUSINESS DAYS IN ADVANCECENTER OF COLORADOCALL UTILITY NOTIFICATION1-800-922-1987MEMBER UTILITIES.TOTALONSITE AREADISTURBED(SF)292,723TOTALOFFSITE AREADISTURBED(SF)01.PROJECT WILL BE CONSTRUCTED IN A SINGLE PHASE.2.STORAGE/STAGING AREAS SHALL BE WITHIN THE AREA OF DISTURBANCE.3.NO HAUL ROADS OFFSITE ARE EXPECTED.4.HEAVY CONSTRUCTION TRAFFIC TO BE ROUTED IN COORDINATION WITH THE HTP 5041 PROJECTMANAGER, PRIOR TO START OF CONSTRUCTION.5.GROUNDWATER DEPTHS ARE BASED ON BORING INFORMATION COMPLETED FOR MAVD FLEXOFFICE, FORT COLLINS, COLORADO, BY TERRACON, PROJECT NO. 20205032, DATED 10/20/2020.6.SITE SLOPES SHALL BE NO GREATER THAN 4:1.7.NO RIPARIAN OR SENSITIVE AREAS ARE IDENTIFIED WITH THIS PROJECT.DISTURBANCEAT ANYONE TIME(%)100EXISTINGVEGETATIONDENSITY(%)60EXISTINGSOIL TYPELEAN CLAYW/ SAND &SANDYLEAN CLAYGROUNDWATERLEVEL(FT) 18'-22'MATERIALCUT/FILL(CF)6,431(NET CUT)PROJECT DETAILSFUEL & STORAGE LOCATIONTRASH LOCATIONPORTABLE TOILET LOCATIONTOPSOIL STOCKPILE LOCATION
TTT
TECHNOLOGY PARKWAY
(85' ROW)PRECISION DRIVE(66' ROW)ROCK CREEK DRIVE(ROW VARIES)PROPERTY BOUNDARYUTILITY EASEMENT(REC. NO 20080041258)PROPERTY BOUNDARYPROPERTY BOUNDARYPROPERTYBOUNDARYPROPOSED BUILDING427 LF SILT FENCEALONG NORTHCURB OF ROCK CREEK DRIVE610 LF SILT FENCE ALONG NORTHCURB OF ROCK CREEK DRIVE ANDEAST CURB OF TECHNOLOGY PKWY643 LF SILT FENCE ALONG SOUTHCURB OF PRECISION DRIVE ANDEAST CURB OF TECHNOLOGY PKWY1,634 LF SILT FENCE ALONG SOUTH CURBOF PRECISION DRIVE AND AROUNDOUTER WEST EDGE OF PROPOSED PONDDRAINAGE & UTILITY EASEMENT(REC. NO 20080041257)DRAINAGE & UTILITY EASEMENT(REC. NO 20080071164)LOT 1LOT 2LOT 3TRACT A15
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GFGRADING & UTILITY EASEMENT(REC. NO. 20150029090)SANITARY SEWER EASEMENT(REC. NO. 20160048879)9' UTILITY EASEMENT(REC. NO. 2001085362)16' DRAINAGE EASEMENT(REC. NO. 20160049345)RR5' x 5'5' x 5'GFRR2.5' WIDE4' LONG2' DEEPRR2.5' WIDE4' LONG2' DEEP25' WIDE18' LONG2' DEEPASPHALT PARKING LOTASPHALT PARKING LOTASPHALT PARKING LOT
ASPHALT PARKING LOT ASPHALT PARKING LOT
ASPHALT PARKING LOTRR9' WIDE7.5' LONG2' DEEP13' WIDE12' LONG2' DEEP10' WIDE10' LONG2' DEEPRR9' WIDE7.5' LONG2' DEEPRR9' WIDE7.5' LONG2' DEEPASPEN0'SCALE: 1" = 30'30'60'SHEET No:PROJECT/ LOCATION:
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7project no:date: FIFTY FORTY ONE TECHNOLOGY PARKWAY
FORT COLLINS, COLORADO
FINAL PHASE EROSION CONTROL PLANEX-00335JUNE 8, 2022100-004AGWAGWJRGNOTES: .1.PERIMETER SILT FENCE SHALL BE INSTALLED ALONGPROPERTY BOUNDARY, AND IS SHOWN OFFSET FROMPROPERTY BOUNDARY ON THIS PLAN FOR CLARITY.·PERIMETER SILT FENCE AROUND SITE = 2,888 LF2.ALL DISTURBED AREAS ARE TO BE SEEDED AND MULCHED.3.STOCK PILES SHALL NOT TO EXCEED 10' IN HEIGHT.4.ALL OFFSITE AREAS DISTURBED DURING CONSTRUCTION ARETO BE RE-VEGETATED AND RETURNED TO HISTORICCONDITION. STRAW WATTLES OR GRAVEL INLET FILTERS MAYBE INSTALLED (IF NECESSARY AND AS REQUIRED) ONEXISTING, OFFSITE/DOWNSTREAM INLETS.5.VEHICLE TRACKING PAD(S) LOCATIONS SHALL BE DETERMINEDBY THE CONTRACTOR, PRIOR TO CONSTRUCTION, AND SHALLBE INSTALLED ACCORDINGLY.6.SEE SHEET EX-004 & EX-005 FOR EROSION CONTROL NOTESAND DETAILS.7.NORTH AMERICAN GREEN C350 FABRIC WILL BE UTILIZED ATMINOR OUTFALL LOCATIONS SHOWN, WITH RIPRAP UTILIZEDWHERE LARGER STORM FLOWS WILL DISCHARGE TO THEPROPOSED DETENTION POND.8.PERMANENT STORMWATER CONTROL MEASURES SUCH ASRAINGARDENS, BIOSWALES OR BIORETENTION PONDS, SHALLBE CONSTRUCTED IN THE LAST PHASE OF CONSTRUCTION ONTHE SITE TO MINIMIZE THE POTENTIAL FOR SEDIMENTATION.9.NO DEBRIS OR MUD SHALL BE TRACKED ONTO ADJACENTSTREETS AND ANY TRACKING THAT DOES OCCUR, WILL BECLEANED IMMEDIATELY BY THE CONTRACTOR.LEGEND .INSTALL VEHICLE TRACKING PADINSTALL SILT FENCEINSTALL CONCRETE WASHOUTHAY OR STRAW DRY MULCH (1-5%)INSTALL 12" STRAW WATTLE CHECK DAMLIMITS OF DISTURBANCEINSTALL CURB INLET GRAVEL FILTERINSTALL AREA INLET GRAVEL FILTERPROPOSED DIRECTION OF SURFACE FLOWINSTALL ROCK SOCK FILTERINSTALL GRAVEL CURB CHECK BAGINSTALL NORTH AMERICAN GREEN C350PROPOSED MAJOR CONTOUR - 5 FT INTERVALPROPOSED MINOR CONTOUR - 1 FT INTERVALEXISTING MAJOR CONTOUR - 5 FT INTERVALEXISTING MINOR CONTOUR - 1 FT INTERVALVTCSFWIPIPGBMUCWORSGFEXISTING DIRECTION OF SURFACE FLOWINSTALL RIPRAP PROTECTION (TYPE M D =12")RR502526FOR THE MARKING OF UNDERGROUNDBEFORE YOU DIG, GRADE, OR EXCAVATECALL 2 BUSINESS DAYS IN ADVANCECENTER OF COLORADOCALL UTILITY NOTIFICATION1-800-922-1987MEMBER UTILITIES.TOTALONSITE AREADISTURBED(SF)292,723TOTALOFFSITE AREADISTURBED(SF)01.PROJECT WILL BE CONSTRUCTED IN A SINGLE PHASE.2.STORAGE/STAGING AREAS SHALL BE WITHIN THE AREA OF DISTURBANCE.3.NO HAUL ROADS OFFSITE ARE EXPECTED.4.HEAVY CONSTRUCTION TRAFFIC TO BE ROUTED IN COORDINATION WITH THE HTP 5041 PROJECTMANAGER, PRIOR TO START OF CONSTRUCTION.5.GROUNDWATER DEPTHS ARE BASED ON BORING INFORMATION COMPLETED FOR MAVD FLEXOFFICE, FORT COLLINS, COLORADO, BY TERRACON, PROJECT NO. 20205032, DATED 10/20/2020.6.SITE SLOPES SHALL BE NO GREATER THAN 4:1.7.NO RIPARIAN OR SENSITIVE AREAS ARE IDENTIFIED WITH THIS PROJECT.DISTURBANCEAT ANYONE TIME(%)100EXISTINGVEGETATIONDENSITY(%)60EXISTINGSOIL TYPELEAN CLAYW/ SAND &SANDYLEAN CLAYGROUNDWATERLEVEL(FT) 18'-22'MATERIALCUT/FILL(CF)6,431(NET CUT)PROJECT DETAILS
www.herefordnrcd.com/Straw_Wattles.pdf) AND PER DETAILSAND INSTALLATION INSTRUCTIONS CALLED FOR ON THIS SHEET.2. IF GRAVEL INLET FILTERS ARE USED, REFER TO "CURB INLET GRAVEL FILTER" DETAIL, THIS SHEET.STRAWWATTLE/ROCKSOCK CHECKDAMwww.herefordnrcd.com/Straw_Wattles.pdfWOODENSTAKE(TYP)STRAWWATTLEWOODENSTAKE(TYP)EMBEDWATTLE/ROCKSOCK FILTERS3" TO 5" INTOSOILEMBEDWATTLE/ROCKSOCK 3" TO 5"INTO SOILSHEET No:PROJECT/ LOCATION:
DRAWING:OFCHECKED BY:DESIGNED BY:DRAWN BY:DESCRIPTION OF REVISION:DATE:REVISED BY:APPROVED BY:REV. #
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7project no:date: FIFTY FORTY ONE TECHNOLOGY PARKWAY
FORT COLLINS, COLORADO
EROSION CONTROL NOTES & DETAILSEX-00445JUNE 8, 2022100-004JRGJRGJRGFOR THE MARKING OF UNDERGROUNDBEFORE YOU DIG, GRADE, OR EXCAVATECALL 2 BUSINESS DAYS IN ADVANCECENTER OF COLORADOCALL UTILITY NOTIFICATION1-800-922-1987MEMBER UTILITIES.
4.0'4.0'10.0'10.0'7.0'8.0'13.0'12.0'11.4'3.0'9.0'7.5'11.4'3.0'7.5'9.0'14.3'3.0'7.5'9.0'SLOPEINSTALLATIONDETAILDrawing Not To Scale1.Prepare soil before installing rollederosion control products (RECPs),including any necessaryapplication of lime, fertilizer, andseed.2.Begin at the top of the slope byanchoring the RECPs in a6"(15cm) deep X 6"(15cm) widetrench with approximately 12"(30cm) of RECPs extended beyondthe up-slope portion of the trench.Anchor the RECPs with a row ofstaples/stakes approximately 12"(30cm) apart in the bottom of thetrench. Backfill and compact thetrench after stapling. Apply seed tothe compacted soil and fold theremaining 12"(30cm) portion ofRECPs back over the seed andcompacted soil. Secure RECPsover compacted soil with a rowof staples/stakes spacedapproximately 12"(30cm) apartacross the width of the RECPs.3.Roll the RECPs (A) down or (B)horizontally across the slope.RECPs will unroll with appropriateside against the soil surface. AllRECPs must be securely fastenedto soil surface by placingstaples/stakes in appropriatelocations as shown in the staplepattern guide.4.The edges of parallel RECPs mustbe stapled with approximately 2" -5" (5-12.5cm) overlap dependingon the RECPs type.5.Consecutive RECPs spliced downthe slope must be end over end(Shingle style) with an approximate3"(7.5cm) overlap. Staple throughoverlapped area, approximately12"(30cm) apart across entireRECPs width.Drawn on: 5-4-17Disclaimer:The information presented herein is general design information only. For specific applications,consult an independent professional for further design guidance.2"-5"(5-12.5cm)3B42513A12"(30cm)6"(15cm)6"(15cm) *NOTE:In loose soil conditions, the use ofstaple or stake lengths greater than6"(15cm) may be necessary toproperly secure the RECP's.3"(7.5cm)5401 St. Wendel - Cynthiana Rd.Poseyville, IN 47633PH: 800-772-2040www.nagreen.comCHANNELINSTALLATIONDETAILDrawing Not To Scale1.Prepare soil before installing rollederosion control products (RECPs),including any necessary application oflime, fertilizer, and seed.2.Begin at the top of the channel byanchoring the RECPs in a 6"(15cm)deep X 6"(15cm) wide trench withapproximately 12"(30cm) of RECPsextended beyond the up-slope portionof the trench. Use ShoreMax mat at thechannel/culvert outlet as supplementalscour protection as needed. Anchor theRECPs with a row of staples/stakesapproximately 12"(30cm) apart in thebottom of the trench. Backfill andcompact the trench after stapling. Applyseed to the compacted soil and fold theremaining 12"(30cm) portion of RECPsback over the seed and compacted soil.Secure RECPs over compacted soilwith a row of staples/stakes spacedapproximately 12" apart across thewidth of the RECPs.3.Roll center RECPs in direction of waterflow in bottom of channel. RECPs willunroll with appropriate side against thesoil surface. All RECPs must besecurely fastened to soil surface byplacing staples/stakes in appropriatelocations as shown in the staple patternguide.4.Place consecutive RECPs end-over-end(Shingle style) with a 4"-6" overlap. Usea double row of staples staggered 4"apart and 4" on center to secureRECPs.5.Full length edge of RECPs at top of sideslopes must be anchored with a row ofstaples/stakes approximately 12"(30cm)apart in a 6"(15cm) deep X 6"(15cm)wide trench. Backfill and compact thetrench after stapling.6.Adjacent RECPs must be overlappedapproximately 2"-5" (5-12.5cm)(Depending on RECPs type) andstapled.7.In high flow channel applications astaple check slot is recommended at 30to 40 foot (9 -12m) intervals. Use adouble row of staples staggered4"(10cm) apart and 4"(10cm) on centerover entire width of the channel.8.The terminal end of the RECPs must beanchored with a row of staples/stakesapproximately 12" (30cm) apart in a6"(15cm) deep X 6"(15cm) wide trench.Backfill and compact the trench afterstapling.Drawn on: 5-4-17Disclaimer:The information presented herein is general design information only. For specific applications,consult an independent professional for further design guidance.2"-5"(5-12.5cm)62412"(30cm)6"(15cm)6"(15cm)4"-6"(10-15cm)86"(15cm)574"(10cm)31ABCABC NOTES:*Horizontal staple spacing should bealtered if necessary to allow staples tosecure the critical points along the channelsurface.**In loose soil conditions, the use of stapleor stake lengths greater than 6"(15cm) maybe necessary to properly secure theRECP's. CRITICAL POINTSA. Overlaps and SeamsB. Projected Water LineC. Channel Bottom/Side Slope Vertices4"(10cm)6"(15cm)5401 St. Wendel - Cynthiana Rd.Poseyville, IN 47633PH: 800-722-2040www.nagreen.comOUTLET PIPEENDS OF GRAVEL FILTER TO BEKEYED INTO FILL SLOPE.TOE OF FILLFLOWGRAVEL FILTER(3/4"Ø ± GRAVEL,WRAPPED IN CHICKENWIRE)MAINTENANCE NOTES:1. FORM CHICKEN WIRE WRAP ALONG FRONT OF OUTLET STRUCTURE AND EXTENDING INTO EMBANKMENT OF POND.2. PACK WITH 3/4" GRAVEL AND ROLL & TWIST CHICKEN WIRE WRAP AT TOP TO HOLD TOGETHER (WIRE TIE, IF NECESSARY).GRAVEL FILTER SHALL BE 18" TALL x 18" WIDE AND SLOPE TOWARDS OUTLET STRUCTURE OR LAID UP AGAINST OUTLETSTRUCTURE FOR STABILITY.3. SEDIMENT BASIN FILTER SHALL BE INSPECTED PERIODICALLY AND AFTER EACH RAIN EVENT, AND REPAIRED WHENNECESSARY. ACCUMULATED SEDIMENT SHALL BE REMOVED.4. SEDIMENT BASIN FILTER SHALL BE REMOVED AFTER IT HAS SERVED ITS PURPOSE.OUTLET PIPEFILTEREDWATERRUNOFF18" TALL GRAVEL FILTER.18"18"OUTLET STRUCTUREOUTLET STRUCTURESHEET No:PROJECT/ LOCATION:
DRAWING:OFCHECKED BY:DESIGNED BY:DRAWN BY:DESCRIPTION OF REVISION:DATE:REVISED BY:APPROVED BY:REV. #
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7project no:date: FIFTY FORTY ONE TECHNOLOGY PARKWAY
FORT COLLINS, COLORADO
EROSION CONTROL DETAILSEX-00555JUNE 8, 2022100-004JRGJRGJRG NOTES:1. CONCRETE FOREBAYS SHALL BE CONSTRUCTED WITH 6" OR 8" TALLCURB HEIGHTS AND TO DIMENSIONS SHOWN IN DETAILS TO THERIGHT. SEE GRADING PLAN FOR SPOT ELEVATIONS. 2" NOTCHESSHALL BE FORMED OR CUT OUT OF THE LATERAL CURB FACES OFEACH FOREBAY, AS SHOWN.2. CONCRETE FOREBAYS SHALL BE 4000 PSI CONCRETE WITH #4 REBAR@ 12" O.C, EACH WAY. #4 BAR SHALL BE BENT 90° FOR VERTICALCURB SECTION AND TIED TO BOTTOM SLAB BARS.3.ALL FOREBAYS SHALL HAVE TYPE M RIPRAP INSTALLED AROUNDPERIMETERS OF FOREBAYS TO DIMENSIONS SHOWN IN DETAILS TOTHE RIGHT. SEE RIPRAP DETAIL THIS SHEET.4. NUMBERING 1-5 FOR FOREBAYS, IN DETAILS TO THE RIGHT, STARTSAT THE NORTH END OF SITE AND GOES SOUTH, THEN EAST.ASPEN0'SCALE: 1" = 5'5'10'
TECHNOLOGY PARKWAY
(85' ROW)PRECISION DRIVE(66' ROW)PROPERTY BOUNDARYROCK CREEK DRIVE(ROW VARIES)9' UTILITY EASEMENT(REC. NO. 2001085362)16' DRAINAGE EASEMENT(REC. NO. 20160049345)UTILITY EASEMENT(REC. NO 20080041258)SANITARY SEWER EASEMENT(REC. NO. 20160048879)LOT 1WINDSONG AT ROCK CREEK(RECEPTION NO. 2016050565)LOT 1EYE CENTER OF NORTHERNCOLORADO SUBDIVISION(RECEPTION NO. 20160032638)UNPLATTED(HARMONY TECHNOLOGY PARK LLC)LOT 1MAINSTREET HEALTH & WELLNESS SUITES(RECEPTION NO. 20150031289)LOT 1
HARMONY TECHNOLOGY PARK 3RD FILING FIRST REPLAT
(RECEPTION NO. 20120001483)
LOT 1
HARMONY TECHNOLOGY PARK 5TH FILING
(RECEPTION NO. 20170034697)UNPLATTED(POUDRE R-1 SCHOOL DISTRICT)PROPERTY BOUNDARYPROPERTY BOUNDARYPROPERTY BOUNDARYDRAINAGE & UTILITY EASEMENT(REC. NO 20080041257)TT
(2')(2')PROPOSED BUILDINGPOND 501OS9OS7OS12OS13OS14OS15LOT 1LOT 2LOT 3TRACT A5020.64AC50215
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8a8b6b1c1b171016921d6a415537174.700.80161.260.25111.200.9040.480.3860.520.74100.050.85140.250.80130.710.92120.200.84OS140.070.66OS150.070.66OS120.480.72OS130.490.73OS90.320.8390.210.3280.310.7720.060.2930.070.4850.100.8810.430.74150.350.4170.140.261aDRAINAGE & UTILITY EASEMENT(REC. NO 20080071164)18OVERFLOW WEIROVERFLOW WEIROVERFLOW WEIR1011ASPEN0'SCALE: 1" = 40'40'80'LEGENDEXISTING CONTOURSNEW INTERMEDIATE CONTOURS1920NEW INDEX CONTOURSPROPOSED FLOWLINEEX RIGHT-OF-WAY/ PROPERTY BOUNDARYPROPOSED DRAINAGE BASIN BOUNDARYLINESPROPOSED STORM PIPEEXISTING STORM PIPE & MANHOLER
D
PROPOSED ROOF DRAIN AND STORM PIPE1.PROPOSED ELEVATIONS SHOWN ARE RELATIVE TO A DATUM OF 4900 FEET, AND ARE BASED ON THEBENCHMARKS DESCRIBED ON SHEET C-001.2.THE DRAINAGE BASINS SHOWN ON THIS EXHIBIT WILL BE CONVEYED TO DETENTION POND 501, LOCATEDBETWEEN THE DEVELOPED AND UNDEVELOPED AREAS OF THE SITE. THE DEVELOPED SITE RUNOFF ANDOFFITE BASIN RUNOFF IS CONVEYED TO THE PROPOSED DETENTION AND WATER QUALITY POND VIAOVERLAND FLOW, PIPE AND INLET SYSTEMS, AND PROPOSED SWALES. DRAINAGE DESIGN FOR THEPROPOSED SITE IS IN ACCORDANCE WITH THE HARMONY TECHNOLOGY PARK SITE MASTER PLAN (HTPSMP)AND ASSOCIATED DRAINAGE CONDITIONS IN THE MAINSTREET HEALTH AND WELLNESS PROJECT. WATERQUALITY AND DETENTION IS BEING PROVIDED IN PROPOSED POND 501. THE HTPSMP SPECIFIED ANALLOWABLE IMPERVIOUS RATIO OF UP TO 80% FOR SWMM BASIN 801. THE CALCULATED IMPERVIOUS RATIOIS 67% FOR THE 5041 HARMONY TECHNOLOGY PARK SITE AND OFFSITE ATTRIBUTING BASINS, ANDTHEREFORE, IS IN COMPLIANCE WITH THE PREVIOUSLY APPROVED MASTER PLAN STUDY FOR THIS AREA.3.PLEASE REFER TO THE RATIONAL METHOD CALCULATIONS FOR FINAL BASIN FLOW CALCULATIONS, AS WELLAS. ROUTED FLOWS.4.12" OF CDOT CLASS 'A' BEDDING MATERIAL SHALL BE PLACED UNDER ALL RIPRAP SHOWN.5.ROOF DRAINS FROM THE PROPOSED BUILDING WILL CONNECT TO AN UNDERGROUND STORM SEWER ANDWILL DISCHARGE TO A LID BASIN FOR WATER QUALITY TREATMENT IN MINOR EVENTS. EXCESS RUNOFFENTERING THE LID BASIN, WILL OVERFLOW INTO DETENTION POND 501.6.RUNOFF FROM THE SITE WILL DRAIN TO LOW POINTS AND PASS THROUGH CURB CUTS, SIDEWALK CHASES,AND SWALES BEFORE ENTERING STORM PIPES AND RAINGARDENS, WHICH ULTIMATELY DISCHARGE TO THEPROPOSED DETENTION POND 501. PERMANENT GEOTEXTILE FABRIC AND GRASS LINED DRAINAGE CHANNELSWILL ENHANCE EROSION CONTROL WITHIN THE SITE LIMITS. SITE BMP'S WILL BE IMPLEMENTED TO REDUCESEDIMENT TRANSPORT OFFSITE, AS SHOWN IN THE FINAL EROSION CONTROL PLAN, AND AS PRESENTED INTHE STORMWATER MANAGEMENT PLAN PREPARED FOR THIS PROJECT.7.ALL PROPOSED STORM DRAINAGE PIPES AND STRUCTURES (OUTSIDE OF PLATTED ROW) WILL BE PRIVATELYOWNED AND MAINTAINED. THE EXISTING SOUTH STORM SEWER SYSTEM, PASSING THROUGH THE SITE, WILLBE OWNED AND MAINTAINED BY MAVD. ALL EXISTING STORM SEWER WITHIN PUBLIC ROW, WILL BE OWNEDAND MAINTAINED BY THE CITY OF FORT COLLINS.8.OFFSITE BASIN 502 IS SHOWN FOR REFERENCE PURPOSES ONLY. RUNOFF FROM BASIN 502 IS CONVEYED TOEXISTING SWMM POND 110, LOCATED SOUTH OF THE CUSTOM BLENDING SITE.NOTES:PROPOSED DRAINAGE BASIN SUMMARY TABLE:PROPOSED DRAINAGE BASIN IDACRES / 'C' VALUEPROPOSED DRAINAGE DESIGN POINTDRAINAGE FLOW DIRECTIONDRAINAGE SWALE0.740.431PROPOSED LID SUMMARY TABLE:SHEET No:PROJECT/ LOCATION:
DRAWING:OFCHECKED BY:DESIGNED BY:DRAWN BY:DESCRIPTION OF REVISION:DATE:REVISED BY:APPROVED BY:REV. #
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7project no:date: FIFTY FORTY ONE TECHNOLOGY PARKWAY
FORT COLLINS, COLORADO
DRAINAGE EXHIBITC-0101018JUNE 8, 2022100-004JRGJRGJRGPROPOSED POND SUMMARY TABLE:PONDDESC100-YRWSEL.(FT)*VOLUMEPROVIDED(AC-FT)4916.902.72DETENTION POND2.68501**VOLUMEREQUIRED(AC-FT)WQCVWSEL(FT)4913.390.27WQCV(AC-FT)*VOLUME PROVIDED OF 2.72 AC-FT IS THE INTERPOLATED VOLUME AT THE 100-YR WSEL IN POND 501. CONSIDERINGPOND 501 DOES NOT SPILL UNTIL APPROXIMATELY 4917.72, THE VOLUME PROVIDED UP UNTIL OVERFLOW FROMPOND 501 IS APPROXIMATELY 4.0 AC-FT. PLEASE REFER TO POND 501 RATING CURVE FOR DETAILS.**POND 501 IS SIZED TO PROVIDE DETENTION AND WATER QUALITY FOR 12.33 ACRES OF ATTRIBUTABLE AREA(BASINS1-17) FOR THE HARMONY TECHNOLOGY PARK 5041 DEVELOPED AREA AND INCLUDES A TOTAL OF 1.29ACRES (BASINS OS9, OS12 & OS13) OF OFFSITE AREA.