HomeMy WebLinkAbout2590 MIDPOINT DRIVE - PDP - PDP160010 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER MANAGEMENT PLANRidgetop Job #16-015-002 March 11, 2016
STORMWATER MANAGEMENT PLAN (SWMP)
FOR
2590 MIDPOINT DRIVE
AT THE
LOT 18, PROSPECT INDUCSTRIAL PARK, FORT COLLINS, CO
During the construction process, soil is the most vulnerable to erosion by wind and water. This eroded
soil endangers water resources by reducing water quality, and causing the siltation of aquatic habitat for
fish and other desirable species. Eroded soil also necessitates repair of sewers and ditches, and the
dredging of lakes. In addition, clearing and grading during construction causes the loss of native
vegetation necessary for terrestrial and aquatic habitat, and may be necessary to provide a healthy living
environment for citizens of Fort Collins.
INTENT OF THE STORMWATER MANAGEMENT PLAN (SWMP)
The intent of the Stormwater Management Plan (SWMP) is to minimize water Pollution by providing
guidance on how to protect the storm drain inlet and adjacent detention basin during construction
activities from grading, utility construction, waste materials such as concrete washout, and any
disturbances to dirt/earth. Protect as much existing vegetation as possible, slow down runoff, prevent or
minimize erosion form construction activities, provide incremental phased seeding and mulching,
avoidance and minimization, stabilization, implementation, seeding and scheduling of the plan.
Stabilize earth disturbances; prevent sediment from reaching the receiving or surface waters.
CONTACT INFORMATION AND RESPONSIBLE PARTIES
Prepared by:
Ridgetop Engineering & Consulting, LLC
5255 Ronald Reagan Blvd Suite 210
Johnstown, CO 80534
303.322.6480
Contracotr and SWMP Administrator:
Company Name:______________________________________________
Address:________________________________________________________________
Telephone:_________________
Project Manager:_______________________
Emergency SWMP Contact:__________________________
Ridgetop Job #16-015-002 March 11, 2016
PROJECT SITE DESCRIPTION
The project is located in the southeast quarter (SE ¼) of the northwest quarter (NW ¼) of Section 20,
Township 7 North, Range 68 West of the 6th P.M. in Larimer County, Colorado. Also located along the
north side of Midpoint Drive, about halfway between South Timberline Road and Sharp Point Drive.
The site contains 0.86 Acres of the current Lot 18. Site is bordered on the north by Highway 34, east and
west by vacant land, and 21st Street to the south.
This construction project is within the City of Fort Collins, which has a Phase II Municipal Separate
Storm Sewer System Permit from the State of Colorado.
Construction Activity Description:
The intent of the development is to initially construction Temporary Best Management Practices prior to
constructing onsite infrastructure to accommodate a new one-story 9,047 SF building. New
underground utilities, pavement, and buildings will be constructed as part of this development.
Overall Sequence:
This project will be constructed in one phase that will include installation of BMP’s, site grading
(including pond preparation), utility installation, building construction, final grading, and final
vegetative cover installed. See a more detailed project sequencing later in this report.
Soil Information:
The existing soil onsite is categorized by the Soil Conservation Service as Caruso Clay Loam. The soil
groups are listed as a Hydrologic Group ‘D’ for both soil types. According to the geotechnical report
prepared by “Earth Engineering Consultants, LLC” on January 6, 2015 the site soils consist of brown
clayey sand underlain by poorly graded sands and gravels.
Estimated runoff coefficient for the 100-year event of the soils onsite before construction is 0.50, and
after future final construction will be 0.67.
Receiving Waters:
Stormwater from this site is currently collected by sheet flow and is directed to Midpoint Drive where it
is conveyed via storm pipe to the Pourde River, approximately 0.24 miles from the site.
The runoff from the developed site will be conveyed on site via trickle channels and or sheet flow to
onsite detention facilities. The runoff will be detained for a period of time and released at the historic
release rates into Midpoint Drive. The detention facilities were also designed for water quality treatment
prior to release.
RECEIVING WATER NAME: POUDRE RIVER
DISTANCE FROM PROJECT TO THE RECEIVING WATER OUTFALL IS: APPROXIMATELY 1/4 MILE
WETLAND IMPACTS? YES NO
STREAM IMPACTS? YES NO
THREATENED OR ENDANGERERD SPECIES? YES NO [if yes please list]
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Area Information:
The total acreage of disturbance, including all clearing, grading, excavation activities, areas receiving
overburden (e.g. stockpiles), demolition areas and areas with heavy equipment/vehicle traffic and
storage that will disturb existing vegetative cover is approximately 0.78 acres.
Total area (acres) of construction site: 0.78
Total area (acres) of disturbance off-site: 0.05
Total area (acres) of disturbance: 0.83
Total area (acres) of impervious: 0.53
Total area (acres) of permanent landscaping: 0.25
Location and Description of Other Potential Pollution Sources:
Potential Pollutant Sources include sediment, uncovered soil, construction machinery, concrete
washouts, building materials, and fertilizers. It is anticipated that any storage of materials of machinery
will be on site and surrounded by silt fence and/or straw wattles.
Existing Vegetation & Features:
The site slopes to the northeast, towards the existing conveyance swale at an average of 1% to 3%. The
existing grasses are well established and have prevented any visible signs of erosion onsite.
The existing site is covered by a well-established mix of native grasses. (Site visit summer 2015)
There are no areas or features unusually sensitive to erosion on this site.
There are no other non-storm water flows onsite.
No groundwater was observed in the geotechnical investigation and it is not anticipated to be present in
any of the site excavations during construction.
The contractor shall identify on the SWMP permit a qualified SWMP Administrator.
ADDITIONAL PERMITS
City construction permits only.
THE STORMWATER MANAGEMENT PLAN
The SWMP will be implemented in three phases: 1) first construction activity, 2) during construction,
and 3) final stabilization.
The SWMP Administrator will be (TBD)
Site Map Components
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During construction items will be added as necessary to render the SWMP current, such as:
1. Areas used for storage of building materials, soils or wastes.
3. Location of work access routes during construction.
4. Location of borrow and waste locations.
First Construction Activities
Clearing and Grubbing is anticipated to begin near the beginning of April 2016.
Prior to Work Commencing
Sediment control measures will be implemented in accordance with the approved schedule prior to any
construction.
Perimeter control will be established as the first item on the SWMP.
BMPs for other pollutants such as concrete truck washout and stockpiles will be identified and
implemented.
The locations of any additional BMPs will be added to the SWMP.
Offsite Drainage
The project site does not have stormwater runoff draining onto or through it from any of the adjacent
property areas. This runoff to the west of the site is conveyed to the existing swale located to the north.
The existing detention facility was sized to accommodate the runoff from this completed project. No
sheet flow from adjacent properties is expected.
If necessary, BMPs will be used to prevent off-site water from running on-site and becoming
contaminated with sediment or other pollutants or to divert off-site flows away from the project site to
prevent water contamination.
BMPs Installed
First Construction BMPs include:
Perimeter Control
- Silt Fence – As shown on the Erosion Control (EC) Plans Silt Fence shall be
installed as a temporary BMP in areas of sheet flow around the perimeter of
the site where a potential for pollutants to leave the site.
- Rock Sock/Gravel Bag – As shown on the EC Plans, this BMP shall be used
to trap sediment from stormwater runoff that flows along roadways or along
curb and gutter.
- Dust Particulate of Wind Blown Control – Measures shall be taken during
construction to control wind erosion and sediment. Water shall be applied
during earthwork activities in order to meet moisture requirements and reduce
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wind erosion. Disturbed areas shall be covered as timely as possible or seeded
to minimize the potential for wind erosion.
Concrete Washout Basin – As shown on the EC Plans, a concrete washout area is
designated in order to receive wash water from washing of tools and equipment related to
concrete trucks, mixers, and pump trucks. Concrete washout areas may be lined or
unlined excavated pits in the ground, or commercially manufactured containers and be
maintained regularly to ensure proper operation.
Vehicle Tracking Control – A Construction Exit as indicated on the EC Plans shall be
installed at the entrance/exit location of construction vehicles. The stone placed within
this area is to reduce the amount of sediments leaving the site. Should off-site tracking
occur, all practicable measures to clean roads and storm drainage ways, at a minimum by
the end of each work day, will be utilized.
Details of all BMPs are included either on the Grading Plan, Detail Sheets or this SWMP.
Potential Pollutants / Materials Handling and Spill Prevention
Vehicle and equipment fueling will not occur onsite
Vehicle and equipment washing will not occur onsite
Storage of fertilizers, chemicals or other materials will not occur onsite
Haul roads will not be constructed on this site
Loading/unloading areas are limited to the imported structural fill that will be used for pipe
bedding.
Trash and construction debris will be collected in temporary construction roll-offs
During Construction
Grading and slope stabilization is anticipated to begin May 2016 .
Installation of utilities is anticipated to begin on May/June 2016 .
Stabilizing Disturbances
1. Disturbed surfaces will be left in a roughened condition at all times by equipment tracking,
scarifying or disking the surface on contour with a 2 to 4 inch minimum variation in soil surface.
2. Disturbed areas where work is temporarily halted will be temporarily stabilized within 14 calendar
days after activity has ceased unless work is to be resumed within 30 calendar days after the activity
ceased as authorized by the City Engineer.
3. During the seasons when seeding does not produce vegetative cover, temporary stabilization will
occur. Temporary stabilization will consist of 1.5 tons certified weed free forage per acre,
mechanically crimped into the soil in combination with an organic mulch tackifier.
4. Construction activities will be limited to those areas within the limits of disturbance as shown on the
plans. Off road staging areas or stockpiles must be pre-approved by the City of Fort Collins. If
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necessary, disturbances beyond these limits will be restored to original condition as soon as possible
after construction work is completed.
5. The permittee will tabulate additional disturbances locations and quantities not identified in the
SWMP and add them to the SWMP.
Inspection and Maintenance of Erosion Control Devices
Inspections will be conducted at least every 14 days and after any significant precipitation event where
erosion may have occurred. Replacement of failed BMPs will be conducted immediately, but no later
than 24 hours. Maintenance of erosion control measures will be conducted within 7 days. Sediment
will be cleaned out when silt depth is 50% or greater than the erosion control device.
Batch Plants
There are no asphalt or concrete batch plants planned for this site.
POST-CONSTRUCTION BMPS
Final Stabilization
Permanent Seeding or sod installation is anticipated to begin on August 2016 .
Final stabilization is anticipated to be completed on Sept/Oct 2016 .
Final Stabilization is reached when all ground surface disturbing activities at the site have been
completed, and uniform vegetative cover has been established with an individual plant density of at least
70% of pre-disturbance levels, or equivalent permanent, physical erosion reduction methods have been
employed.
BMPs Installed
The Final Stabilization will consist of monitoring the landscaped slopes and BMPS until the required
germination has taken place. BMPS to remain in place include:
Permanent Seeding and Planting – Establishment of permanent perennial vegetation such as
trees, shrubs, vines, grasses or sod, and/or erosion control blankets on exposed areas for final
stabilization by holding soil particles in place. Once established the potential for erosion is
limited and the vegetation promotes infiltration of the runoff. See EC and Landscape Plans for
locations and additional information.
Preservation of Existing Vegetation – Preserving existing vegetation should occur where no
construction activity will take place. Preserving of existing/natural vegetation is considered a
permanent BMP and contractor shall take measures where possible to keep areas undisturbed.
Soft Pans – Permanent Soft Plans are considered a Low Impact Development BMP and are
typically constructed below final grade and convey water to a desired location. The soft pan
areas allow for additional infiltration into the existing soil stratum. See EC Plans for these
locations.
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Rain Garden – Rain Gardens are considered a Low Impact Development BMP and are included
on the EC and Grading Plans for this development. This permanent BMP allows for treatment of
the runoff, reduces potential pollutants, filters, and evapotranspiration. This BMP can also act
as the WQCV and detain the 100-year storm event volume.
Potential Pollutants / Materials Handling and Spill Prevention
Vehicle and equipment fueling will not occur onsite
Vehicle and equipment washing will not occur onsite
Storage of fertilizers, chemicals or other materials will not occur onsite
Haul roads will not be constructed on this site
Location of Cleanup Kits containing absorbent rags, absorbent litter and over-pack drum to store
material in
Any chemicals and/or MSDS products to be labeled appropriately
Loading/unloading areas are limited to the imported structural fill that will help level the
building pad
Trash and construction debris will be collected in temporary construction roll-offs
In accordance with the Record Keeping section below with regard to Spill Response, contractor shall
notify the following:
Non-Hazardous
CDPHE at 1-877-518-5608
Colorado State Patrol 24-hour hotline at 1-303-239-4501
Hazardous Materials
Local emergency response team by dialing 911
CDPHE at 1-877-518-5608
Colorado State Patrol 24-hour hotline at 1-303-239-4501
Seeding Plan
The seeding of bare areas shall be as shown on the SWMP and use the seed mix and rates shown on the
Landscape Plan.
Reseeding operations / corrective stabilization
Areas where seed has not germinated after one season will be evaluated by the City. Areas that have not
germinated will have seed, mulch and mulch tackifier (or blanket) reapplied.
Inspection and Maintenance of Erosion Control Devices
Once construction activity has ceased and landscaping has been completed, but before final stabilization
of the site is accomplished, inspections can be reduced to once a month. Replacement of failed BMPs
will be conducted immediately, but no later than 24 hours after the failure has been identified.
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Maintenance of erosion control measures will be conducted within 7 days. Sediment will be cleaned out
when silt depth is 50% or greater than the erosion control device.
Termination of the Construction Permit
BMPs will be removed and the Construction Permit terminated once 70% of preexisting cover has been
established within the disturbed project limits.
RECORDKEEPING
1. Accurate and complete records will be kept, and maintained for three years after the Site
Development Permit is terminated.
2. The SWMP should be considered a "living document" that will be continuously reviewed and
modified, including but not limited to: additions, deletions, and changing locations of BMPs. These
changes will be marked in the plans, dated and signed at time of occurrence.
3. All inspection and maintenance activities or other repairs will be documented and the records
available for review by the City.
4. Records of spill, leaks or overflows that result in the discharge of pollutants must be documented
and maintained. Information that should be recorded for all occurrences include the time and date,
weather conditions, reasons for spill, etc. A release of any chemical, oil, petroleum product, sewage,
etc., which may enter state waters must be reported immediately to the City at _____TBD_
(_________ after hours), and the State of Colorado Spill Hotline at 1-877-518-5608.
2. Incidents of noncompliance, such as uncontrolled releases of pollutants including mud, muddy water
or measurable quantities of sediment found off-site will be noted, along with a brief explanation as
to measures taken to prevent future violations and measures taken to clean up sediment that has left
the site.
CORRECTIVE ACTION LOG
Create as an attachment, a corrective action log. This log should describe repair, replacement, and
maintenance of BMPs undertaken based on the inspections and maintenance procedures, date
completed, and note the person that completed the work. Actions related to the findings of an inspection
should reference the specific report.
This log will also describe changes and updates to the SWMP, including additions of new BMPs,
replacement of failed BMPs, significant changes in the activities or their timing on the project, changes
in personnel, changes in inspection and maintenance procedures, and updates to site maps, etc.
TRAINING
Staff and subcontractors will be trained to identify stormwater BMPs and how to prevent problems with
them, such as not driving onsite unless through the vehicle tracking control or taking care to not to
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damage BMPs. Documentation on training at safety meetings or otherwise will be kept on file with the
SWMP, including dates, number of attendees, subjects covered, and length of the training.
FAILURE TO PERFORM
Failure to implement SWMP puts the project in automatic violation of the Construction Permit.
Failure to comply with the Colorado Department of Public Health and Environment Permit requirements
will constitute a violation by the Contractor. Civil penalties for violations can be up to $10,000 per day,
and a criminal pollution of state water is punishable by fines of up to $25,000 per day. For additional
information, review the permit on file or go on-line to the CDPHE web site at
http:www.cdphe.state.co.us/wq/permitsunit/wqcdpmt.html.
APPENDICES
Appendix A Vicinity Map
Appendix B Site Maps
Appendix C Erosion & Sediment Control Escrow
Appendix D Inspection Reports
Appendix E BMP Specifications and Details
Ridgetop Job #16-015-002 March 11, 2016
Appendix A
Vicinity Map
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Appendix B
Site Maps
MIDPOINT DRIVE
LOT 18
BUILDING
9,047 SF
FFE = 4901
Of
PROJECT TITLE
REVISIONS
SHEET TITLE
SHEET INFORMATION
DATE
SEAL
DATE
PREPARED FOR
ENGINEERING R IDGE & CONSULTING T OP
5255 Ronald Reagan Blvd.,
Ste. 210
Johnstown, CO 80534
T (303) 322-6480
W ridgetopeng.com
DRAWN BY:
CHECKED BY:
PROJECT NO.:
R4 ARCHITECTS
LOT 18 SPEC.
BUILDING
226 REMINGTON, UNIT 3
FORT COLLINS, CO
2590 MIDPOINT DR
FORT COLLINS, CO
16015002
MRB
BSA
9
SUBMITTAL
PRELIMINARY SITE PLAN
03/11/2016
EROSION
CONTROL PLAN
ER-1.0
3
Ridgetop Job #16-015-002 March 11, 2016
Appendix C
Erosion & Sediment Control Escrow
Disturbed Area = 0.78 ac
SITEWORK Quantity Unit Unit Cost Current OPC
Description:
EROSION CONTROL BMP's
Silt Fence 756 LF $2.00 $1,512
Rock Sock/Gravel Bag 4 Each $150.00 $600
Vehicle Tracking Control 1 Each $850.00 $850
Concrete Washout 1 Each $1,500.00 $1,500
Sub-total Earthwork $4,462
50% Cont $2,231
Total $6,693
Reseeding
Reseeding/Mulch/Erosion Blanket 0.78 Acre $1,100.00 $858
Sub-total Erosion Control $858
50% Cont $429
Total $1,287
GRAND TOTAL $7,980
Final Escrow Amount $7,980
Minimum Escrow = $3,000 for Commercial
11‐Mar‐16
Lot 18 ‐ 2590 Midpoint Drive
Erosion & Sediment Control Escrow/Security Calculation for the City of Fort Collins
Ridgetop Job #16-015-002 March 11, 2016
Appendix D
Inspection Reports
Ridgetop Job #16-015-002 March 11, 2016
Appendix E
BMP Specifications and Details
EROSION
NOTES
ER-2.0
4 Of
PROJECT TITLE
REVISIONS
SHEET TITLE
SHEET INFORMATION
DATE
SEAL
DATE
PREPARED FOR
ENGINEERING R IDGE & CONSULTING T OP
5255 Ronald Reagan Blvd.,
Ste. 210
Johnstown, CO 80534
T (303) 322-6480
W ridgetopeng.com
DRAWN BY:
CHECKED BY:
PROJECT NO.:
R4 ARCHITECTS
LOT 18 SPEC.
BUILDING
226 REMINGTON, UNIT 3
FORT COLLINS, CO
2590 MIDPOINT DR
FORT COLLINS, CO
16015002
MRB
BSA
9
SUBMITTAL
PRELIMINARY SITE PLAN
03/11/2016
1.
3B.
3A.
4.
5.
2.
Hard Surface
or Public Road
PIT EXCAVATED MATERIAL
CONTAINMENT BERM FROM
CONCRETE TRUCKS
WASHOUT HERE
ALL