HomeMy WebLinkAboutReports - Erosion Control - 10/29/2025
Page 1 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
VOA Switchgrass
Erosion Control Report
March 29, 2025
Owner/Developer:
Doug Snyder
Volunteers of America
2660 Larimer St
Denver, CO 80205
Design Engineer:
Ted Swan, PE
Shopworks
301 W. 45th Ave
Denver, CO 80216
Contractor/SWMP Administrator:
Bob Thayer
BC Builders, LLC
7108 S Alton Way E-1
Centennial, CO 80112
__________________________________
Ted Swan, PE 43903
October 29, 2025
10/29/2025
Page 2 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
Table of Contents
A. Project Description pg. 3
B. Potential Pollution Sources pg. 4
C. Control Measures pg. 7
D. Project Phasing pg. 8
E. Maintenance and Inspection Requirements pg. 8
F. Final Vegetation and Stabilization pg. 8
G. References pg. 9
H. Appendix pg. 10
Page 3 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
A. Project Description
1. Location
a. The 1.40 ac (as platted) VOA Switchgrass site (Site) at 3800 S Mason St is bounded
by Mason Street on the west, commercial property on the east and south, and Mason
Place residential property on the north. The property has been platted as Creger
Plaza Third Replat Lot 2 Subdivision Filing No. 1, Lot 1, Blk 1.
Please see vicinity map below:
Scale 1” = 300’
b. The existing 1.4 acre site (as platted) is currently developed with an asphalt parking
lot covering the entire site. The site slopes generally to the west at 1-2% to two
existing inlets that convey storm water downstream to the storm main within
Mason St. The Mason St storm flows to the confluence of Mail Creek and Fossil Creek
and ultimately outfalls at the Fossil Creek Reservoir. Geotechnical analysis has been
Page 4 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
performed and the soil is anticipated to be mostly comprised of type C and D clayey
soils as supported by the NRCS soil data. Groundwater was found at depths of 8+ ft
in all borings. The NRCS soil map has been included in Appendix A. As shown on
FEMA FIRM Panel 08069C0987G in Appendix A, the site is not located in a FEMA
floodplain.
c. The proposed project will include the construction of a multifamily residential
building, parking lot and drive lanes on the 1.4 acre site. The site disturbance will
include the full 1.4 acres of the property as well as an additional 0.2 acres of the
Mason St right of way.
The initial phase of construction will involve placement of perimeter erosion control
BMPs including rock socks along the Mason St sidewalk and curb socks within the
Mason St gutter and then demo of the existing asphalt parking lot. It is anticipated
that the staging area will be roughly 0.1 acres and located along the northern edge
of the property. It is expected that soil will be imported into the site with an
approximate net fill of 1500 yds.
After demo is complete, then the site will be rough graded and the three extended
detention basins will be graded in as temporary sediment basins for construction
stormwater treatment. Diversion ditches will be graded in to route stormwater to
the temp sediment basins. Following the completion of grading, the site will be
excavated for building foundation and utilities will be constructed to connect to
existing public infrastructure. After the utilities and building foundation have been
constructed then the building vertical construction will begin. Finally, the last phase
of construction will be site stabilization including paving operations and landscape
construction.
B. Potential Pollution Sources
1. All Disturbed and Stored Soils
a. As the Site is demolished, graded and excavated, disturbed soil will be present
onsite with the potential to be transported into Mason St and the downstream storm
system.
b. As noted, the site will have perimeter rock socks placed on the downhill Mason St
side of the site as well as diversion ditches to convey construction stormwater to
temporary sediment basins on the outskirts of the site. These measures should help
reduce the potential for offsite sediment transport.
2. Vehicle Tracking of Sediments
a. During grading and excavation activities, construction vehicles will collect sediment
and soil on their tire treads and potentially transport to the Mason St Right of Way.
b. Vehicular traffic will be limited to the northern entry during construction and a
vehicle tracking control pad (VTC) will be installed to remove sediment and soil
from tire treads. This will reduce the potential for transport into the Right of Way.
Additionally, periodic street sweeping will be conducted to remove and sediment
and soil from Mason St
Page 5 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
3. Management of Contaminated Soils
a. Contaminated soils were not encountered on site during the geotechnical analysis
and are not expected to be an issue during construction.
b. If contaminated soils are encountered during construction then State protocol will
be followed for disposal.
4. Loading and Unloading Operations
a. Material and Soil loading and unloading operations are anticipated to occur onsite.
However, the material is anticipated to be standard construction materials.
b. Loading and unloading operations will occur within the boundaries of the site.
Materials are not anticipated to be contaminated or hazardous and the established
boundary control will reduce the risk of materials spreading offsite.
5. Outdoor storage of construction materials, building materials, fertilizers and chemicals
a. Outdoor storage of construction and other materials is anticipated to occur onsite
prior to their use in building construction, landscaping and paving.
b. Construction and other materials will be largely stored in the stabilized staging area.
They will be elevated off the ground surface to prevent transport via storm runoff.
In the event of a spill, MHFD protocol will be followed by the use of sandbags and
earthen barriers to capture materials and dispose properly.
6. Bulk storage of materials
a. Since the site is primarily covered in pavement currently and the site is anticipated
to be an import site, bulk storage of materials and stockpiling is not expected to be
necessary.
b. If bulk storage of materials and stockpiling is required, specific perimeter controls
including silt fence and rock socks will be placed directly around the
storage/stockpile area.
7. Vehicle and Equipment Maintenance and Fueling
a. Vehicle and equipment maintenance and fueling is anticipated to occur onsite
during the course of construction.
b. Vehicle and equipment maintenance and fueling will largely occur in the stabilized
staging area. In the event of a spill, MHFD protocol will be followed by the use of
sandbags and earthen barriers to capture materials and dispose properly.
8. Significant dust or particulate generating process
a. Significant dust or particulate generating process is not anticipated to occur
regularly onsite, but could occur during initial grading operations.
b. Water trucks will be utilized to mitigate dust during grading operations. Areas
outside the building footprint that are to remain unpaved and unplanted for over
two weeks will be seeded and mulched to reduce dust from the site.
9. Routine maintenance activities involving fertilizers, pesticides, detergents, fuels,
solvents and oils.
Page 6 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
a. Routine maintenance activities involving potentially hazardous chemicals is not
anticipated to occur onsite regularly.
b. If maintenance activities involving chemicals do occur onsite, they will be largely
conducted in the stabilized staging area. In the event of a spill, MHFD protocol will
be followed by the use of sandbags and earthen barriers to capture materials and
dispose properly.
10. On site waste management practices
a. On site waste management is anticipated to occur regularly during the course of
construction.
b. An outside waste management company will be responsible for waste disposal and
waste facility maintenance. Both services will occur regularly on a schedule.
11. Concrete truck/equipment washing
a. A concrete truck and other equipment including chutes is expected to be onsite
regularly during the course of construction.
b. A concrete washout area has been located in the erosion control plans and will be
constructed in accordance with MHFD standard details. Maintenance and disposal
will occur as needed per MHFD criteria.
12. Dedicated asphalt and concrete batch plants
a. Considering the scale of the project, dedicated asphalt and concrete batch plants will
not be necessary
13. Non-industrial waste sources such as worker trash and portable toilets
a. On site waste management is anticipated to occur regularly during the course of
construction.
b. An outside waste management company will be responsible for waste disposal and
waste facility maintenance. Both services will occur regularly on a schedule.
14. Saw Cutting and Grinding
a. Saw Cutting and grinding of existing pavements is expected to occur regularly
during the course of construction.
b. Slurry from saw cutting and grinding is to be continuously vacuumed and stored
onsite until it can be disposed of at designated facilities
15. Other non-stormwater discharges including construction dewatering
a. Considering the low groundwater table and relatively low depth of excavation
required for the project, construction dewatering is not anticipated to be necessary
during the course of construction
b. If local areas of higher groundwater are encountered, it will be pumped to an onsite
basin and allowed to infiltrate.
Page 7 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
C. Construction Control Measures – the following BMPs are anticipated to be utilized
during the course of construction to reduce erosion and offsite sediment transport.
See erosion control details plan for additional information.
1. Rock Socks
a. Rock Socks will be utilized at the western perimeter of the site along the Mason St
curb and gutter. Their purpose will be to reduce flows from the site into Mason St
and trap sediment. Rock socks will be placed during the initial phase of erosion
control and demo. They will remain until the site is stabilized at the end of
construction.
2. Diversion Ditches
a. Diversion Ditches will be used at the perimeter of the site to capture runoff from the
construction site and convey to the Temporary Sediments ponds for water quality
treatment. Diversion Ditches will be placed during the interim phase of erosion
control when excavation and grading begin. They will remain until the site is paved
in the final erosion control phase.
3. Check Dams
a. Check Dams will be installed within the diversion ditches to slow the velocity of
runoff within the ditch and allow sediment to fall out. Check Dams will be placed
during the interim phase of erosion control when excavation and grading begin.
They will remain until the site is paved in the final erosion control phase.
4. Temporary Sediment Ponds
a. Temporary Sediment Ponds will capture and contain construction stormwater so
that sediment and other pollutants can settle out before water is routed to the
public storm system downstream. Temporary Sediment Ponds will be placed during
the interim phase of erosion control when excavation and grading begin. They will
remain until the site is paved in the final erosion control phase.
5. Vehicle Tracking Control
a. Vehicle Tracking Control will be installed at the singe entry to the site at the NW
corner. It will reduce sediment transport from construction traffic into the Mason St
ROW. Vehicle Tracking Control will be placed during the initial phase of erosion
control and demo. It will remain until the site is paved in the final erosion control
phase.
6. Stabilized Staging Area
a. A stabilized staging area will be located at the NE corner of the site and will contain
trailers, wastewater facilities, and raised material storage and stacking pads. The
Staging area will be out of the path of onsite storm runoff and will provide a place to
store materials that will be out of the way of construction vehicles. The Staging Area
will help to reduce material and chemical spills. The Stabilized Staging Area will be
placed during the initial phase of erosion control and demo. It will remain until the
site is paved in the final erosion control phase.
7. Inlet protection
a. Inlet protection will be placed around onsite inlets to slow down construction runoff
and allow sediment to settle out of stormwater before it is conveyed downstream to
public storm sewer. The inlet protection will be placed during the initial phase of
Page 8 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
erosion control and demo. It will remain until the site is paved in the final erosion
control phase.
8. Concrete Washout Area
a. A concrete washout area will be provided onsite to contain the slurry from concrete
trucks and chutes. The area will collect concrete slurry and will then be disposed of
properly offsite. The Concrete Washout Area will be placed during the interim phase
of erosion control. It will remain until concrete construction is no longer necessary
in the final erosion control phase.
9. Seeding and Mulching
a. Areas of the site outside of the building footprint that are to be disturbed and
remain unpaved for more than 2 weeks will be seeded and mulched to stabilize soil
and reduce sediment transport. The Seeding and Mulching will be placed during the
final phase of erosion control to stabilize areas of the site that will not be paved or
landscaped immediately.
D. Project Phasing
1. The project will be completed in one phase.
E. Maintenance and Inspection Requirements
1. All erosion control BMPs will be inspected weekly and after all storm events to ensure
they are functioning properly. BMPs shall be replaced if they are determined to no
longer be functioning at the same level as when they were initially installed.
F. Final Vegetation and Stabilization
1. At the end of construction, all areas of the site that are not within the building footprint
will be paved, landscaped in accordance with the project landscape plans or seeded and
mulched in accordance with City Code, Section 12-160 through 12-162. Soil bed
preparation and seed mixes will be prescribed within the landscape plans for the site.
Disturbed areas to be seeded and mulched will be considered finally stabilized once
plant life is visible at the surface.
2. The estimated timeline for stabilization of onsite disturbed areas is six weeks once the
fall or spring growing season has been reached. As defined in the FCSCM, stabilization
reached when all ground disturbing activities have been completed and for all areas of
ground surface disturbing activities, a uniform vegetative cover has been established
with a vegetative cover of at least 70% or equivalent permanent physical erosion
reduction methods have been employed.
3. Sediment within all storm infrastructure onsite and the adjacent Mason St ROW will be
removed to the greatest extent possible by the use of hydrovacuum at the end of
construction. Removal will take place once final stabilization has been met onsite and
before the last remaining BMPs have been removed
Page 9 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
G. References
1. Fort Collins Stormwater Criteria Manual, Aurora, CO, December 2018.
2. Urban Storm Drainage Criteria Manual, volumes 1, 2, and 3, Urban Drainage and Flood
Control District, August 2018, September 2017, and January 2021 (respectively).
Page 10 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
Appendix A
USGS Soil Survey
FEMA FIRM Map
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/26/2025
Page 1 of 4
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493260 493270 493280 493290 493300 493310 493320 493330 493340 493350
493260 493270 493280 493290 493300 493310 493320 493330 493340 493350
40° 32' 7'' N
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Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 30 60 120 180
Feet
0 5 10 20 30
Meters
Map Scale: 1:619 if printed on A portrait (8.5" x 11") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 19, Aug 29, 2024
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 2, 2021—Aug 25,
2021
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/26/2025
Page 2 of 4
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
76 Nunn clay loam, wet, 1
to 3 percent slopes
C 0.5 27.7%
90 Renohill clay loam, 3 to
9 percent slopes
D 0.1 7.2%
136 Water 1.2 65.1%
Totals for Area of Interest 1.9 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/26/2025
Page 3 of 4
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Larimer County Area, Colorado
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/26/2025
Page 4 of 4
SITE
Page 11 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
Appendix B
Erosion Control Escrow Calculation
Project:Disturbed Acres:1.60
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F.275 $3.00 $825.00
EA 3 $500.00 $1,500.00
EA 1 $1,000.00 $1,000.00
S.F 921 $8.00 $7,368.00
S.F.3212 $3.00 $9,636.00
EA 3 $1,000.00 $3,000.00
S.F.10,125 $2.50 $25,312.50
$0.00
Sub-Total:$48,641.50
1.5 x Sub-Total:$72,962.25
Amount of security:$72,962.25
Total Acres x Price/acre:$14,400.00
$9,000.00 Sub-Total: $14,400.00
1.5 x Sub-Total:$21,600.00
Amount to Re-seed:$21,600.00
Minimum escrow amount:$3,000.00
Erosion Control Escrow:$72,962.25
Fields in yellow should be amended for this project.
Miniumum Escrow Amount
Switchgrass Crossing
Unit Price of Seeding per acre:
“The amount of the security must be based on one and one-half times the estimate of the cost to install the approved measures, or one and one-half times
the cost to re-vegetate the disturbed land to dry land grasses based upon unit cost determined by the City's Annual Revegetation and Stabilization Bid,
whichever is greater. In no instance, will the amount of security be less than one thousand five hundred dollars ($1,500) for residential development or three
thousand dollars ($3,000) for commercial development”
Inlet Protection (IP)
Concrete Washout (CW)
(add all other BMPs for the site in this list)
Final Escrow Amount
Stabilized Staging Area (SSA)
Example Erosion and Sediment Control Escrow/Security
Calculation for The City of Fort Collins
BMP Amount
Rock Socks (RS)
Vehicle Tracking Control (VTC)
…etc…
Reseeding Amount
Temporary Sediment Basin (TSB)
Seeding and Mulching
4/7/2025 9:07 AM https://shopworksarc.sharepoint.com/sites/Server/Projects/24046 VOA Fort Collins Mason/Design/Civil/Erosion Control/Calculations/Example_Escrow
Page 13 of 13 301 West 45th Avenue, Denver, CO 80216 303 433-4094
Appendix C
Erosion Control Plans and Details
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PROJECT #:
DRAWN:
REV:
SCALE:
NO.
SHEET TITLE:
REVIEWED:
DATE:
FILE:
12345
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TS
CONSTRUCTION DOCS
EROSION CONTROL
NOTES SHEET
C1.3
TS
24046
10/29/2025
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24046_CD COVER & NOTES
REF PLAN
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3
GRADING AND EROSION AND SEDIMENT CONTROL NOTES
1. The erosion control inspector must be notified at least twenty-four (24) hours
prior to any construction on this site.
2. There shall be no earth-disturbing activity outside the limits designated on the
accepted plans.
3. All required perimeter silt and construction fencing shall be installed prior to
any land disturbing activity (stockpiling, stripping, grading, etc). All other
required erosion control measures shall be installed at the appropriate time in the
construction sequence as indicated in the approved project schedule, construction
plans, and erosion control report.
4. At all times during construction, the Developer shall be responsible for
preventing and controlling on-site erosion including keeping the property
sufficiently watered so as to minimize wind blown sediment. The Developer shall
also be responsible for installing and maintaining all erosion control facilities
shown herein.
5. Pre-disturbance vegetation shall be protected and retained wherever possible.
Removal or disturbance of existing vegetation shall be limited to the area(s)
required for immediate construction operations, and for the shortest practical
period of time.
6. All soils exposed during land disturbing activity (stripping, grading, utility
installations, stockpiling, filling, etc.) shall be kept in a roughened condition by
ripping or disking along land contours until mulch, vegetation, or other permanent
erosion control BMPs are installed. No soils in areas outside project street rights of-way
shall remain exposed by land disturbing activity for more than thirty (30)
days before required temporary or permanent erosion control (e.g. seed/mulch,
landscaping, etc.) is installed, unless otherwise approved by the City of Loveland.
7. In order to minimize erosion potential, all temporary (structural) erosion
control measures shall:
a. Be inspected at a minimum of once every two (2) weeks and after
each significant storm event and repaired or reconstructed asnecessary in order to
ensure the continued performance of their intended function.
b. Remain in place until such time as all the surrounding disturbed
areas are sufficiently stabilized as determined by the erosion
control inspector.
c. Be removed after the site has been sufficiently stabilized as
determined by the erosion control inspector.
8. When temporary erosion control measures are removed, the Developer shall be
responsible for the clean up and removal of all sediment and debris from all
drainage infrastructure and other public facilities.
9. The contractor shall immediately clean up any construction materials
inadvertently deposited on existing streets, sidewalks, or other public rights of
way, and make sure streets and walkways are cleaned at the end of each working
day.
10. All retained sediments, particularly those on paved roadway surfaces, shall be
removed and disposed of in a manner and location so as not to cause their release
into any waters of the United States.
11. No soil stockpile shall exceed ten (10) feet in height. All soil stockpiles shall
be protected from sediment transport by surface roughening, watering, and
perimeter silt fencing. Any soil stockpile remaining after thirty (30) days shall be
seeded and mulched.
12. The stormwater volume capacity of detention ponds will be restored and
storm sewer lines will be cleaned upon completion of the project and before
turning the maintenance over to the City of Loveland or Homeowners Association
(HOA).
13. City Ordinance and Colorado Discharge Permit System (CDPS) requirements
make it unlawful to discharge or allow the discharge of any pollutant or
contaminated water from construction sites. Pollutants include, but are not limited
to discarded building materials, concrete truck washout, chemicals, oil and gas
products, litter, and sanitary waste. The developer shall at all times take whatever
measures are necessary to assure the proper containment and disposal of
pollutants on the site in accordance with any and all applicable local, state, and
federal regulations.
14. A designated area shall be provided on site for concrete truck chute washout.
The area shall be constructed so as to contain washout material and located at
least fifty (50) feet away from any waterway during construction. Upon
completion of construction activities the concrete washout material will be
removed and properly disposed of prior to the area being restored.
15. To ensure that sediment does not move off of Individual lots one or more of
the following sediment/erosion control BMPs shall be installed and maintained
until the lots are sufficiently stabilized, as determined by the erosion control
inspector, (Loveland GMA & city limits only).
(a.) Below all gutter downspouts.
(b.) Out to drainage swales.
(c.) Along lot perimeter.
(d.) Other locations, if needed.
16. Conditions in the field may warrant erosion control measures in addition to what is
shown on these plans. The Developer shall implement whatever measures are
determined necessary, as directed by the City of Loveland.
17. A Vehicle Tracking Control Pad shall be installed whenever it is necessary for
construction equipment including but not limited to personal vehicles exiting existing
roadways. No earthen materials, i.e., stone, dirt, etc., shall be placed in the curb & gutter
or roadway as a ramp to access temporary stockpile(s), staging area(s), construction
material(s), concrete washout area(s) and/or building site(s).
CITY OF FORT COLLINS GRADING AND EROSION AND SEDIMENT
CONTROL NOTES
1. The property owner, owner’s representative, developer, design engineer, general
contractor, sub-contractors, or similar title for the developing entity (here after referred
to as the developer) has provided these erosion control materials in accordance with
erosion control criteria set forth in the manual as an attempt to identify erosion,
sediment, and other potential pollutant sources associated with these construction
activities and preventing those pollutants from leaving the project site as an illicit
discharge. full city requirements and are outlined and clarified in the manual under
chapter 4: construction control measures and should be used to identify and define what
is needed on a project.
2. The developer shall make themselves thoroughly familiar with the provisions and the
content of the specifications laid out in the manual, the development agreement, the
erosion control materials compiled for this project, and the following notes as all these
materials are applicable to this project.
3. The developer shall implement and maintain control measures for all potential
pollutants from the start of land disturbing activities until final stabilization of the
construction site.
4. The city erosion control inspector shall be notified at least twenty-four (24) hours prior
to the desired start of any construction activities on this site to allow adequate time for
on-site confirmation (initial inspection which can take up to two business days after
receiving the request) that the site is in fact protected from sediment and pollutants
discharges off site. Please contact erosion@fcgov.com early to schedule those initial
erosion control inspections well in advance so that demolition, clearing, grubbing, tree
removal, and scraping may begin without delay. failure to receive an on-site confirmation
before construction activities commence is an automatic “notice of violation” and can
result in further enforcement actions.
5. The developer shall proactively provide all appropriate control measures to prevent
damage to adjacent downstream and leeward properties. this includes but is not limited
to: trees, shrubs, lawns, walks, pavements, roadways, structures, creeks, wetlands,
streams, rivers, and utilities that are not designed for removal, relocation, or replacement
in the course of construction.
6. At all times the developer shall be responsible to ensure adequate control measures
are designed, selected, installed, maintain, repaired, replaced, and ultimately removed in
order standard erosion control notes Fort Collins Stormwater Criteria Manual appendix f
page 2 to prevent and control erosion suspension, sediment transportation, and
pollutant discharge as a result of construction activities associated with this project.
7. All applicable control measures based upon the sequencing and/or phasing of the
project shall be installed prior to those construction activities commencing.
8. As dynamic conditions (due to the nature, timing, sequence, and phasing of
construction) in the field may warrant control measures in addition, or different, to what
is shown on these plans, the developer shall at all times be responsible to implement the
control measures that are most effective with the current state and progress of
construction. the developer shall implement whatever measures are determined
necessary, and/or as directed by the city erosion control inspector. the developer shall
insure that all erosion control plans (maps) or SWMP documents are updated to reflect
the current site conditions, with updates being initialed and dated. these site inspections
and site condition updates shall be made available upon request by the city.
9. All listings, provisions, materials, procedures, activities, site work and the like
articulated in this or other written site-specific documents (including but not limited to
the erosion control reports, development agreements, landscape, and drainage
materials) shall meet or exceed the most restrictive language for city, county, state, and
federal regulations with regards to erosion, sediment, pollutant, and other pollution
source control measures. the developer shall be responsible to comply with all of these
aforementioned laws and regulations.
10. The developer shall ensure that all appropriate permits (cdps general permit
stormwater discharges associated with construction activity, dewatering, clean water act,
Army Corps of Engineers’ 404 wetlands mitigation permit, etc.) have been attained prior
to the relevant activity has begun. these permits or copies shall be made available upon
request by the city.
11. The developer shall furnish all conveniences and assistances to aid the erosion control
inspectors of materials, workmanship, records, and self-inspections, etc. of the control
measures involved in the construction activities.
12. The developer shall request clarification of all apparent site construction issues that
may arise due to inconsistencies in construction plans for the site or site conditions
around the selected control measures by contacting the erosion control inspector. the
erosion control inspector will not be responsible for any explanations, interpretations, or
supplementary data provided by others.
13. All control measures shall be installed in accordance with the manual.
14. The city reserves the right to require additional control measures as site conditions
warrant, to the extent authorized by relevant legal authority.
15. As with any construction standards, occasions may arise where the minimum erosion
control standards are either inappropriate or cannot be justified. in these cases, a
variance to these Fort Collins Stormwater Criteria Manual Appendix f
page 3 standards may be applied for pursuant to the terms, conditions, and procedures
of the manual.
16. Inspection. the contractor shall inspect site pollutant sources and implement control
measures at a minimum of once every two weeks during construction and within 24
hours following a precipitation event. documentation of each inspection shall be
recorded and retained by the contractor.
17. All temporary control measures shall be cleaned, repaired, or reconstructed as
necessary in order to assure continual performance of their intended function. all
retained sediments, particularly those on paved roadway surfaces, shall be removed and
disposed of in a manner and location so as not to cause their release into any drainage
way.
18. Any control measure may be substituted for another standard control measure so
long as that control measure is equal to, or of greater protection than the original control
measure that was to be used in that location. (ex. silt fence, for wattles, or for compact
berms) wattle alone on commercial construction sites have shown to be an ineffective
substitute for silt fence or compact berms unless it is accompanied by a construction
fence to prevent vehicle traffic.
19. Any implementation or replacement of existing control measures for a non-standard
control, or alternative control measure, shall require the review and acceptance by the
city erosion control staff before the measure will be allowed to be used on this project.
these control measures’ details shall be submitted, reviewed and accepted to be in
accordance with the erosion control criteria based upon the functionality and
effectiveness in accordance with sound engineering and hydrological practices land
disturbance, stockpiles, and storage of soils
20. There shall be no earth-disturbing activity outside the limits designated on the
accepted plans. Off road staging areas or stockpiles must be preapproved by the city.
disturbances beyond these limits will be restored to original condition.
21. Pre-disturbance vegetation shall be identified, protected, and retained wherever
possible. removal or disturbance of existing vegetation shall be limited to the area
required for immediate construction operations, and for the shortest practical period of
time. this should include sequencing and phasing construction activities in a way so that
the soil is not exposed for long periods of time by schedule or limit grading to small areas.
this should also include when practical advancing the schedule on stabilization activities
such that landscaping takes place shortly if not immediately after grading has occurred.
vegetation efforts shall start as soon as possible to return the site to a stabilized
condition. sensitive areas should avoid clearing and grading activities as much possible.
Fort Collins Stormwater Criteria Manual Appendix f page 4
22. All exposed soils or disturbed areas are considered a potential pollutant and shall
have control measures implemented on the site to prevent materials from leaving the
site.
23. All soils exposed during land disturbing activity (stripping, grading, utility installations,
stockpiling, filling, etc.) shall be kept in a roughened condition at all times by equipment
tracking, scarifying or disking the surface on a contour with a 2 to 4 inch minimum
variation in soil surface until mulch, vegetation, and/or other permanent erosion control
is installed.
24. No soil stockpile shall exceed ten (10) feet in height. all soil stockpiles shall be
protected from sediment transport through the use of surface roughening, watering, and
down gradient perimeter controls. all soil stockpiles shall be protected from sediment
transport by wind in accordance with municipal code §12-150. all stockpiles shall be
flattened to meet grade or removed from site as soon as practical, and no later than the
completion of construction activities or abandonment of the project. all off-site stockpile
storage locations in city limitsshall have a stockpile permit from the city engineering
department prior to using the area to store material. if frequent access from hardscape
to the stockpile is needed a structural tracking control measure shall be implemented.
25. All required control measures shall be installed prior to any land disturbing activity
(stockpiling, stripping, grading, etc.). all of the required erosion control measures must be
installed at the appropriate time in the construction sequence as indicated in the
approved project schedule, construction plans, and erosion control report.
26. All inlets, curb-cuts, culverts, and other storm sewer infrastructure which could be
potentially impacted by construction activities shall be protected with control measures.
material accumulated from this control measure shall be promptly removed and in cases
where the protection has failed, the pipes shall be thoroughly cleaned out.
27. All streams, stream corridors, buffers, woodlands, wetlands, or other sensitive areas
shall be protected from impact by any construction activity through the use of control
measures.
28. All exposed dirt shall have perimeter control. any perimeter controls that drain off or
has the ability to be tracked onto the nearby hardscape shall have some form of effective
sediment control as the, or as part of the, perimeter control.
29. All exposed slopes should be protected. all exposed steep slopes (steeper than 3:1
h:v) shall be protected from erosion and sediment transport through use of control
measures.
30. No soils shall remain exposed by land disturbing activity for more than thirty (30) days
after activity has ceased before required temporary seeding or permanent erosion
control (e.g. seed/mulch, landscaping, etc.) is installed. this is not just limited to projects
that are abandoned; this includes any project that is temporarily halted and no
immediate activity is to resume within the next thirty (30) days, unless otherwise
approved by the city erosion control inspector. during a season when seeding does not
produce vegetative cover, another Fort Collins Stormwater Criteria Manual Appendix F
page 5 temporary erosion control shall be implemented with or until temporary seeding
or permanent erosion control can be performed.
31. All individual lots shall have effective sediment controls located on the street side and
any down gradient side. typically most lots drain to the front yet on those cases where
houses are along a pond or drainage swale have the lot drain in a different direction than
the street, those individual lots will need protection on that down gradient side to
prevent sedimentfrom leaving the lot. see the individual lot details for further
clarification.
32.At all points where vehicles exit or leave the exposed dirt area on to a hardscape or
semi hardscape (concrete, asphalt, road base, etc.) shall have installed at least one
structural tracking control measure to prevent vehicle tracking. all areas not protected by
an adequate perimeter control shall be considered a point where vehicles exit the site.
access points should be limited to as few entrances as possible (all perimeter areas shall
be protected from tracking activities).
33. In all areas that the structural tracking control measures fail to prevent vehicle
tracking, collection and proper disposal of that material is required. all inlets located near
access points and affected by tracking activities shall be prevented from the introduction
of sediment into the drainage system.
34. City municipal code §20-62, among other things, prohibits the tracking, dropping, or
depositing of soils or any other material onto city streets by or from any source. city
municipal code, §26-498, among other things, prohibits the discharge of pollutants on
public or private property if there is a significant potential for migration of such pollutant.
therefore, all tracked or deposited materials (intentional or inadvertent) are not
permitted to remain on the street or gutter and shall be removed and legally disposed of
by the developer in a timely and immediate manner. dirt ramps installed in the curb-lines
are not exempt to these sections of code and shall not be permitted in the street right of
way (public or private).
35. If repeated deposit of material occurs on a site, additional structural tracking controls
may be required of the developer by the city erosion control inspector.
loading and unloading operations
36. The developer shall apply control measure to limit traffic (site worker or public)
impacts and proactively locate material delivered to the site in close proximity to the
work area or immediately incorporated in the construction to limit operational impacts
to disturbed areas, vehicle tracking, and sediment deposition that could impact water
quality. Fort Collins Stormwater Criteria Manual Appendix F page 6
outdoor storage or construction site materials, building materials, fertilizers, and
chemicals
37. Any materials of a non-polluting nature (steel, rock, brick, lumber, etc.) shall be
inspected for any residue coming off the material during routine inspection and will
generally be located where practical at least fifty (50) feet from any permanent or interim
drainage ways.
38. Any high environmental impact pollutant materials that have a high likelihood to
result in discharge when in contact with stormwater (lubricants, fuels, paints, solvents,
detergents, fertilizers, chemical sprays, bags of cement mix, etc.) should not be kept on
site where practical. when not practical, they should be stored inside (vehicle, trailer,
connex, building, etc.) and out of contact with stormwater or stormwater runoff. where
not available, they shall be stored outside in a raised (high spots or on pallets), covered
(plastic or tarped), and sealed (leak proof container) in secondary containment location.
the secondary containment or other control measure shall be adequately sized, located,
where practical, at least fifty (50) feet from any permanent or interim stormwater
structures or drainage ways and shall be monitored as part of the routine inspections.
vehicle and equipment maintenance and fueling
39. Parking, refueling, and maintenance of vehicles and equipment should be limited in
one area of the site to minimize possible spills and fuel storage areas. this area shall be
located, where practical, at least fifty (50) feet from any permanent or interim
stormwater structures or drainage ways and shall be monitored as part of the routine
inspections. all areas shall keep spill kits and supplies close. Significant dust or particulate
generating process
40. The property must be actively preventing the emission of fugitive dust at all times
during construction and vegetation activities. all land disturbing activities that result in
fugitive dust shall be in accordance with municipal code §12-150 to reduce the impacts to
adjacent properties and community health. all required practices shall be implemented
and additional ones shall be followed. these practices include watering the sites and
discontinuing construction activities until the wind subsides as determined by any city
inspectors.concrete truck / equipment washing, including the concrete truck chute and
associated fixtures and equipment
41. All concrete and equipment washing shall use structural control measures
appropriate to the volume of wash and frequency of use. these control measures shall be
located, where practical, at least fifty (50) feet from any permanent or interim
stormwater structures or drainage ways and shall be monitored as part of the routine
inspections. these areas shall be clearly identified and protected from any wash from
leaving the control measure. if frequent Fort Collins Stormwater Criteria Manual
Appendix F page 7 access from hardscape to the control measure is to occur, a structural
tracking control measure shall be implemented. these control measures shall be
frequently cleaned out.
42. The developer is responsible for ensuring washing activity is taking place at the
appropriate control measure and site workers are not washing or dumping wash water
on to the dirt or other uncontrolled locations. dedicated asphalt and concrete batch
plants
43. Dedicated asphalt and concrete batch plants are not acceptable on construction sites
within the City of Fort Collins without an expressed written request and plan to reduce
pollutants associated with that type of activity and approval by the city of fort collins
specifically the erosion control inspector. the developer shall inform the erosion control
inspection staff of any dedicated asphalt, or concrete batch plants that is to be used on
site.
44. Saw cutting material shall be in accordance with municipal code §12-150 for air
emissions and all water applications to the saw cutting shall prevent material from
leaving the immediate site and collected. these cutting locations, once dried, shall be
swept and scraped of all material and shall have proper and legal disposal.
waste materials storage and sanitary facilities
45. Trash, debris, material salvage, and/or recycling areas shall be, where practical, at
least fifty (50) feet from any permanent or interim stormwater structures or drainage
ways and shall be monitored as part of the routine inspections. these facilities should be
located out of the wind and covered as able. where not able to cover, locating said areas
on the side of other structures to reduce exposure to winds, and follow maximum loading
guidelines as marked on the container. the developer is required to practice good
housekeeping to keep the construction site free of litter, construction debris, and leaking
containers.
46. Sanitary facilities shall be prevented from tipping through the use of anchoring to the
ground or lashing to a stabilized structure. these facilities shall also be located as far as
practical from an inlet, curb cut, drainage swale or other drainage conveyances to
prevent material transport from leaving the local area. this consists of the facility being
located, where practical, at least fifty (50) feet from any permanent or interim drainage
ways. Other site operations and potential spill areas
47. Spills: for those minor spills that; are less than the state’s reportable quantity for
spills, stay within the permitted area, and in no way threaten any stormwater
conveyance, notify the Fort Collins Stormwater Criteria Manual Appendix F page 8
City of Fort Collins Utilities by email at erosion@fcgov.com or phone (970) 817-4770. for
any significant, major, or hazardous spills, notify the city of fort collins utilities by phone
only after emergency response (911) has been notified and is on route, county health
department (lcdhe) has been notified through larimer county sheriff dispatch (970)
416-1985, and the state spill hotline incident reporting have been contacted
1-877-518-5608. written documentation shall be provided to the city within 5 days of the
event. all spills shall be cleaned up immediately.
48. Selection of “plastic welded” erosion control blankets shall not be used in areas that
wildlife, such as snakes, are likely to be located as these have proven to cause
entrapment issues. final stabilization and project completion
49. Any stormwater facilities used as a temporary control measure will be restored and
storm sewer lines will be cleaned upon completion of the project and before turning the
maintenance over to the owner, homeowners association (hoa), or other party
responsible for long term maintenance of those facility.
50. All final stabilization specifications shall be done in accordance with the manual,
chapter 4: construction control measures.
51. All disturbed areas designed to be vegetated shall be amended, seeded & mulched,
or landscaped as specified in the landscape plans within 14 working days of final grading.
52. Soil in all vegetated (landscaped or seeded) areas, including parkways and medians
shall comply with all requirements set forth in sections 12-130 through 12-132 of the city
municipal code, as well as section 3.8.21 for the city land use code.
53. All seeding shall refer to landscaping plans for species mixture and application rates
and depths requirements.
54. All seed shall be drilled where practical to a depth based upon the seed type.
broadcast seeding shall be applied at double the rate as prescribed for drill seeding and
shall be lightly hand raked after application. hydroseeding may be substituted for drill
seeding on slopes steeper than 3(h):1(v) or on other areas not practical to drill seed and
crimp and mulch. all hydroseeding must be conducted as two separate processes of
seeding and tackification.
55. All seeded areas must be mulched within twenty-four (24) after planting. all mulch
shall be mechanically crimped and or adequately applied tackifier. the use of crimped
mulch or tackifier may require multiple re-applications if not properly installed or have
weathered or degraded before vegetation has been established. areas of embankments
having slopes greater than or equal to 3h:1v shall be stabilized with an erosion mat or
approved equal to ensure seed will be able to germinate on the steep slopes. during a
season when seeding does Fort Collins Stormwater Criteria Manual Appendix F
page 9 not produce vegetative cover, another temporary erosion control shall be
implemented along with, or until, temporary seeding or permanent erosion control can
be performed.
56. The developer shall warranty and maintain all vegetative measures for two growing
seasons after installation or until seventy percent (70%) vegetative cover has been
established, whichever is longer and meets all the criteria outlined in the Fort Collins
Stormwater Criteria Manual Chapter 4: construction control measures.
57. The developer shall maintain, monitor, repair, and replace any and all applicable
control measures until final stabilization has been obtained. all control measures must
remain until such time as all upstream contributing pollutant sources have been
vegetated or removed from the site. when any control measure is removed, the
developer shall be responsible for the cleanup and removal of all sediment and debris
from that control measure. at the point at which the site has been deemed stabilized and
verified by city erosion control inspector, all temporary control measures can then be
fully removed. all measures shall be removed within 30 days after final stabilization is
achieved.
58. The responsible party shall maintain and keep current all payments or related forms
of security for the erosion control escrow until 1) stabilization has been reached and 2) all
control measures and/or bmps have sediment materials collected and the control
measure removed from the site. at that time the site will be considered completed and
any remaining erosion control escrow shall be returned to the appropriate parties.
38
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SUBDIVISION
(PLAT - REC. NO. 91030712)
OWNER: D AND M
AUTOMOTIVE
LOT 1 CREGER 3RD REPLAT
(PLAT - REC. NO.
20190044858)
OWNER: MASON PLACE LLLP
LOT 1 PLAT OF MASON STREET PUD
(PLAT - REC. NO. 520208)
OWNER: RCA MASON LLC
EXISTING DRIVEWAY
APPROACH, SIDEWALK
AND CROSSPAN
TO REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
MATCH EXISTING
GRADE AT PROPERTY
LINE
SSA
LOC
LOC
LOC
LOC
LOC
LOC
LOC
RS
RS
IPS
VTC
IPS
EXISTING ELECTRIC
AND LIGHTING TO BE
REMOVED IN SITE
BOUNDARIES
EXISTING ASPHALT
AND STRIPING TO BE
REMOVED IN SITE
BOUNDARIES
EXISTING TREES TO BE
REMOVED IN SITE
BOUNDARIES
EXISTING STAIRS
TO BE REMOVED
EXISTING STAIRS
TO BE REMOVED
EXISTING TREES TO BE
REMOVED IN SITE
BOUNDARIES
EXISTING STORM INLET
TO BE CAPPED WITH
CONCRETE LID AND BURIED
EXISTING STORM INLET
TO BE CAPPED WITH
CONCRETE LID AND BURIED
EXISTING ATTACHED
WALKWAY TO BE
REMOVED WHERE
INDICATED EXISTING CURB ISLANDS
TO BE REMOVED IN SITE
BOUNDARIES
FIBER OPTIC VAULT
TO BE RELOCATED
AS REQUIRED FOR
NEW SIDEWALK
EXISTING
WALKWAY TO BE
REMOVED WHERE
INDICATED
EXISTING TREES
TO REMAIN
EXISTING TREE
TO REMAIN
REMOVE EXISTING DRIVEWAY
APPROACH, SIDEWALK
AND CROSSPAN
4" SEWER SERVICE LINE
TO BE ABANDONED PER CITY
OF FORT COLLINS STDS
EXISTING STORM INLET
TO BE CAPPED WITH
CONCRETE LID AND BURIED
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PROJECT #:
DRAWN:
REV:
SCALE:
NO.
SHEET TITLE:
REVIEWED:
DATE:
FILE:
12345
A
B
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B
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12345
TS
CONSTRUCTION DOCS
DEMO AND INITIAL
EROSION CONTROL
C2.0
TS
24046
10/29/2025
SW
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----
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24046_Erosion Control-Initial
REF PLAN
----2
3
N
40'0
SCALE: 1" = 20'
20'
SWMP PLAN LEGEND
BOUNDARY LINE
EXISTING CURB AND GUTTER
EXISTING STORM LINE
EXISTING STORM MANHOLE
EXISTING STORM INLET
EXISTING MINOR CONTOUR
EXISTING MAJOR CONTOUR
PROPOSED CURB AND GUTTER
PROPOSED SIDEWALK
PROPOSED STORM LINE
PROPOSED STORM MANHOLE
PROPOSED STORM INLET
PROPOSED MINOR CONTOUR
PROPOSED MAJOR CONTOUR
LIMITS OF CONSTRUCTION
FLOW ARROW
SEDIMENT TRAP
REINFORCED SILT FENCE
SILT FENCE
STABILIZED STAGING AREA
VEHICLE TRACKING CONTROL
INLET PROTECTION (SUMP)
ROCK SOCKS
DIVERSION DITCH
TEMPORARY SEDIMENT BASIN
SOIL STOCKPILE
CHECK DAM
5281
5280
5281
5280
ST
ST
SF
SSA
VTC
IPS
RS
DD
TSB
SP
LOC
CD
ST
SFR
38
0
0
S
O
U
T
H
M
A
S
O
N
S
T
FO
R
T
C
O
L
L
I
N
S
,
C
O
8
0
5
2
5
NOTES
1.THE CONTRACTOR SHALL NOTIFY THE ENGINEER OF ANY DISCREPANCIES WITH THE PROPOSED ELEVATIONS SHOWN ON THE
GRADING PLAN. THE ENGINEER WILL NOT BE LIABLE FOR ANY COSTS ASSOCIATED WITH CHANGES TO THE DESIGN WITHOUT
PROPER NOTIFICATION.
2.EXISTING UTILITIES STRUCTURES TO BE ADJUSTED AS NECESSARY TO MEET PROPOSED GRADE.
3.BENCHMARK:
BENCHMARK: CITY OF FORT COLLINS BM 'VIRATA”- 2” ALUMINUM CAP STAMPED “CITY OF FORT COLLINS BENCHMARK VRATA” FOUND
AT THE NORTHWEST CORNER OF COLLEGE AVE., AND HORSETOOTH ROAD ON THE BACK OF WALK AT THE EAST END OF THE PARAPET
WALL OF THE BRIDGE OVER CANAL NO. 2.
ELEVATION: 5034.31
PLEASE NOTE: THIS PLAN SET IS USING NAVD88 FOR A VERTICAL DATUM. SURROUNDING DEVELOPMENTS HAVE USED NGVD29
UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) FOR THEIR VERTICAL DATUMS.
IF NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) IS REQUIRED FOR ANY PURPOSE, THE FOLLOWING EQUATION
SHOULD BE USED: NGVD29 UNADJUSTED DATUM (PRIOR CITY OF
FORT COLLINS DATUM) = NAVD88 DATUM 5031.12’.
TABLE OF CALCULATIONS
TOTAL AREA OF DISTURBANCE 1.53 AC
TOTAL ONSITE AREA OF DISTURBANCE 1.40 AC
TOTAL OFFSITE AREA OF DISTURBANCE 0.13 AC
TOTAL STORAGE/STAGING AREAS NOT 0 AC
INCORPORATED IN ONSITE/OFFSITE AREAS
TOTAL AREA OF NEW OR IMPROVED HAUL ROADS(OFFSITE)0 AC
HEAVY CONSTRUCTION VEHICLE TRAFFIC AREAS OFFSITE
APPROXIMATE PERCENT OF THE PROJECT THAT WILL BE
DISTURBED AT ANY ONE TIME
ESTIMATED PRE-EXISTING PERCENT VEGETATIVE DENSITY 10.4%
OR PERCENT VEGETATIVE COVER BEFORE DISTURBANCE
EXISTING SOIL TYPE CLAY AND SAND (TYPE C HYD GROUP)
DEPTH TO GROUNDWATER 8' AVG DEPTH
NUMBER OF PHASES ASSOCIATED WITH A PROJECT 1
TOTAL VOLUME OF MATERIAL IMPORTED TO OR EXPORTED 3254 CU YDS IMPORT
FROM THE PROJECT
TOTAL AREA OF OFFSITE STOCKPILING OF FILL FROM THE 0 AC
PROJECT OR BORROW FROM STRIPPING THE OFFSITE AREA
STEEPEST SLOPE
DISTANCE FROM A RIPARIAN AREA OR SENSITIVE AREA N/A
5038
5038
503
9
503
9
50
3
9
50
3
9
50
4
0
50
3
8
50
3
9
50
4
0
50
3
8
50
3
9
5037
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
E
EE
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E E E
E
E
E E E E E E E E
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO FO FO FO FO FO FO
FO
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
STSTST ST ST
ST
STST
ST
ST
SS
SS
WWW
WWW
WWW
ST
ST
ST
ST
ST
SO
U
T
H
M
A
S
O
N
S
T
R
E
E
T
(M
A
J
O
R
A
R
T
E
R
I
A
L
30
'
R
I
G
H
T
-
O
F
-
W
A
Y
)
FIRE
HYDRANT
LOT 2 MORELAND
SUBDIVISION
(PLAT - REC. NO. 91030712)
OWNER: D AND M
AUTOMOTIVE
LOT 1 CREGER 3RD REPLAT
(PLAT - REC. NO.
20190044858)
OWNER: MASON PLACE LLLP
LOT 1 PLAT OF MASON STREET PUD
(PLAT - REC. NO. 520208)
OWNER: RCA MASON LLC
ST
ST
ST ST STSTEXISTING PIPE (TYP)
50
3
9
5039
5038
5039
EXISTING DRIVEWAY
APPROACH, SIDEWALK
AND CROSSPAN
TO REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
MATCH EXISTING
GRADE AT PROPERTY
LINE
SS
SS
SSSS
BUILDING EXCAVATION AREA
CD
CD
DD
105 LF
DD
130 LFDD
65 LF
DD
35 LF
LOC
LOC
LOC
LOC
LOC
LOC
LOC
RS
RS
SSA
VTC
IPS
5037
5038
50
3
8
5038
5040
5038
5039
50415041
50
3
8
50
3
9
50
4
0
503
9
50
4
1
50
4
2
TSB
TSB
CWA
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
IPS
IPS
IPS
IPS
Pl
o
t
t
e
d
B
y
:
Te
d
S
w
a
n
La
y
o
u
t
:
C2
.
1
I
N
T
E
R
I
M
E
R
O
S
I
O
N
C
O
N
T
R
O
L
P
L
A
N
-
C
I
T
Y
Pr
i
n
t
e
d
O
n
:
10
/
2
9
/
2
0
2
5
9
:
4
8
A
M
Fi
l
e
N
a
m
e
:
24
0
4
6
_
E
r
o
s
i
o
n
C
o
n
t
r
o
l
-
I
n
t
e
r
i
m
.
d
w
g
1
PROJECT #:
DRAWN:
REV:
SCALE:
NO.
SHEET TITLE:
REVIEWED:
DATE:
FILE:
12345
A
B
C
D
A
B
C
D
12345
TS
CONSTRUCTION DOCS
INTERIM EROSION
CONTROL PLAN
C2.1
TS
24046
10/29/2025
SW
I
T
C
H
G
R
A
S
S
C
R
O
S
S
I
N
G
38
0
0
S
O
U
T
H
M
A
S
O
N
S
T
--------
----
--------
FO
R
T
C
O
L
L
I
N
S
,
C
O
8
0
5
2
5
24046_Erosion Control-Interim
REF PLAN
----2
3
N
40'0
SCALE: 1" = 20'
20'
SWMP PLAN LEGEND
BOUNDARY LINE
EXISTING CURB AND GUTTER
EXISTING STORM LINE
EXISTING STORM MANHOLE
EXISTING STORM INLET
EXISTING MINOR CONTOUR
EXISTING MAJOR CONTOUR
PROPOSED CURB AND GUTTER
PROPOSED SIDEWALK
PROPOSED STORM LINE
PROPOSED STORM MANHOLE
PROPOSED STORM INLET
PROPOSED MINOR CONTOUR
PROPOSED MAJOR CONTOUR
LIMITS OF CONSTRUCTION
FLOW ARROW
STABILIZED STAGING AREA
VEHICLE TRACKING CONTROL
INLET PROTECTION (SUMP)
ROCK SOCKS
DIVERSION DITCH
TEMPORARY SEDIMENT BASIN
SEEDING AND MULCHING
CHECK DAM
CONCRETE WASHOUT AREA
5281
5280
5281
5280
ST
ST
SSA
VTC
IPS
RS
DD
TSB
SM
LOC
CD
CWA
NOTES
1.THE CONTRACTOR SHALL NOTIFY THE ENGINEER OF ANY DISCREPANCIES WITH THE PROPOSED ELEVATIONS SHOWN ON THE
GRADING PLAN. THE ENGINEER WILL NOT BE LIABLE FOR ANY COSTS ASSOCIATED WITH CHANGES TO THE DESIGN WITHOUT
PROPER NOTIFICATION.
2.EXISTING UTILITIES STRUCTURES TO BE ADJUSTED AS NECESSARY TO MEET PROPOSED GRADE.
3.BENCHMARK:
BENCHMARK: CITY OF FORT COLLINS BM 'VIRATA”- 2” ALUMINUM CAP STAMPED “CITY OF FORT COLLINS BENCHMARK VRATA” FOUND
AT THE NORTHWEST CORNER OF COLLEGE AVE., AND HORSETOOTH ROAD ON THE BACK OF WALK AT THE EAST END OF THE PARAPET
WALL OF THE BRIDGE OVER CANAL NO. 2.
ELEVATION: 5034.31
PLEASE NOTE: THIS PLAN SET IS USING NAVD88 FOR A VERTICAL DATUM. SURROUNDING DEVELOPMENTS HAVE USED NGVD29
UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) FOR THEIR VERTICAL DATUMS.
IF NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) IS REQUIRED FOR ANY PURPOSE, THE FOLLOWING EQUATION
SHOULD BE USED: NGVD29 UNADJUSTED DATUM (PRIOR CITY OF
FORT COLLINS DATUM) = NAVD88 DATUM 5031.12’.
5038
5038
503
9
503
9
50
3
9
50
3
9
50
4
0
50
3
8
50
3
9
50
4
0
50
3
8
50
3
9
5037
BBBBB
B B B
B
B
B
B
B
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
E
EE
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E E E
E
E
E E E E E E E E
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO
FO FO FO FO FO FO FO
FO
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
W
SANITARY MH
RIM=5038.02
8" PVC INV S=5032.52
10" PVC INV N=5032.32
SANITARY MH
RIM=5039.00
10" PVC INV S=5031.85
10" PVC INV N=5031.70
STORM INLET
TOG=5036.90
12" PVC INV N=5035.10
12" PVC INV W=5035.10
STORM MH
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
STSTST ST ST
STORM MH
RIM=5038.87
15" RCP INV E=5035.02
18" RCP INV S=5034.17
18" RCP INV NE=5034.17
ST
STORM MH
RIM=5038.85
18" RCP INV S=5034.45
12" RCP INV W=5034.65
18" RCP INV N=5034.45
STORM INLET
TOG=5035.93
15" RCP INV W=5034.45
TOG=5040.38
6" PVC INV W=5038.15
ST
UTILITY CABINET
TRANSFORMER
GENERATOR
UTILITY
VAULT
UTILITY
VAULT
UTILITY
VAULT
ST
ST
ST
SS
SS
LOADING
FDC
VAN
T
WWW
WWW
WWW
ST
ST
ST
ST
ST
SO
U
T
H
M
A
S
O
N
S
T
R
E
E
T
(M
A
J
O
R
A
R
T
E
R
I
A
L
30
'
R
I
G
H
T
-
O
F
-
W
A
Y
)
MAIN ENTRY
10' TREE LAWN
FIRE
HYDRANT
LOT 2 MORELAND
SUBDIVISION
(PLAT - REC. NO. 91030712)
OWNER: D AND M
AUTOMOTIVE
LOT 1 CREGER 3RD REPLAT
(PLAT - REC. NO.
20190044858)
OWNER: MASON PLACE LLLP
LOT 1 PLAT OF MASON STREET PUD
(PLAT - REC. NO. 520208)
OWNER: RCA MASON LLC
ST
ST
ST ST STSTEXISTING PIPE (TYP)
4' CONCRETE PAN
50
3
9
5039
5038
5039
6' ATTACHED CONCRETE
SIDEWALK PER
LARIMER COUNTY
STANDARD DWG 1602
6' CONCRETE
SIDEWALK PER
LARIMER COUNTY
STANDARD DWG 1602
EXISTING DRIVEWAY
APPROACH, SIDEWALK
AND CROSSPAN
TO REMAIN
COURTYARD
(RE LANDSCAPE)
EXISTING
CURB AND
GUTTER TO
REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
EXISTING
CURB AND
GUTTER TO
REMAIN
MATCH EXISTING
GRADE AT PROPERTY
LINE
5037
50
3
7
5038
50
3
8
5038
5039
50
3
8
50
3
9
5040
5038
5039
50415041
50
4
0
50
3
9
50
4
1
SSA
VTC
TSB
SM SM
SM
SM
SM
CWA
SM
SM
SM
BUILDING FFE:
5039.50
BUILDING FFE:
5039.50
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
ST
SS
SS
SSSS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
Pl
o
t
t
e
d
B
y
:
Te
d
S
w
a
n
La
y
o
u
t
:
C2
.
2
F
I
N
A
L
E
R
O
S
I
O
N
C
O
N
T
R
O
L
P
L
A
N
-
C
I
T
Y
Pr
i
n
t
e
d
O
n
:
10
/
2
9
/
2
0
2
5
9
:
4
9
A
M
Fi
l
e
N
a
m
e
:
24
0
4
6
_
E
r
o
s
i
o
n
C
o
n
t
r
o
l
-
F
i
n
a
l
.
d
w
g
1
PROJECT #:
DRAWN:
REV:
SCALE:
NO.
SHEET TITLE:
REVIEWED:
DATE:
FILE:
12345
A
B
C
D
A
B
C
D
12345
TS
CONSTRUCTION DOCS
FINAL EROSION
CONTROL PLAN
C2.2
TS
24046
10/29/2025
SW
I
T
C
H
G
R
A
S
S
C
R
O
S
S
I
N
G
--------
----
--------
24046_Erosion Control-Final
REF PLAN
----2
3
N
40'0
SCALE: 1" = 20'
20'
SWMP PLAN LEGEND
BOUNDARY LINE
EXISTING CURB AND GUTTER
EXISTING STORM LINE
EXISTING STORM MANHOLE
EXISTING STORM INLET
EXISTING MINOR CONTOUR
EXISTING MAJOR CONTOUR
PROPOSED CURB AND GUTTER
PROPOSED SIDEWALK
PROPOSED STORM LINE
PROPOSED STORM MANHOLE
PROPOSED STORM INLET
PROPOSED MINOR CONTOUR
PROPOSED MAJOR CONTOUR
LIMITS OF CONSTRUCTION
FLOW ARROW
STABILIZED STAGING AREA
VEHICLE TRACKING CONTROL
INLET PROTECTION (SUMP)
ROCK SOCKS
DIVERSION DITCH
TEMPORARY SEDIMENT BASIN
SEEDING AND MULCHING
CHECK DAM
CONCRETE WASHOUT AREA
5281
5280
5281
5280
ST
ST
SSA
VTC
IPS
RS
DD
TSB
SM
LOC
CD
CWA
38
0
0
S
O
U
T
H
M
A
S
O
N
S
T
FO
R
T
C
O
L
L
I
N
S
,
C
O
8
0
5
2
5
NOTES
1.THE CONTRACTOR SHALL NOTIFY THE ENGINEER OF ANY DISCREPANCIES WITH THE PROPOSED ELEVATIONS SHOWN ON THE
GRADING PLAN. THE ENGINEER WILL NOT BE LIABLE FOR ANY COSTS ASSOCIATED WITH CHANGES TO THE DESIGN WITHOUT
PROPER NOTIFICATION.
2.EXISTING UTILITIES STRUCTURES TO BE ADJUSTED AS NECESSARY TO MEET PROPOSED GRADE.
3.BENCHMARK:
BENCHMARK: CITY OF FORT COLLINS BM 'VIRATA”- 2” ALUMINUM CAP STAMPED “CITY OF FORT COLLINS BENCHMARK VRATA” FOUND
AT THE NORTHWEST CORNER OF COLLEGE AVE., AND HORSETOOTH ROAD ON THE BACK OF WALK AT THE EAST END OF THE PARAPET
WALL OF THE BRIDGE OVER CANAL NO. 2.
ELEVATION: 5034.31
PLEASE NOTE: THIS PLAN SET IS USING NAVD88 FOR A VERTICAL DATUM. SURROUNDING DEVELOPMENTS HAVE USED NGVD29
UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) FOR THEIR VERTICAL DATUMS.
IF NGVD29 UNADJUSTED DATUM (PRIOR CITY OF FORT COLLINS DATUM) IS REQUIRED FOR ANY PURPOSE, THE FOLLOWING EQUATION
SHOULD BE USED: NGVD29 UNADJUSTED DATUM (PRIOR CITY OF
FORT COLLINS DATUM) = NAVD88 DATUM 5031.12’.
12345
A
B
C
D
12345
fi
l
e
p
a
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h
:
C:
\
U
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e
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s
\
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D
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D
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s
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2
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i
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2
4
0
4
6
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C
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D
e
t
a
i
l
s
.
d
w
g
1
PROJECT #:
DRAWN:
REV:
SCALE:
NO.
SHEET TITLE:
REVIEWED:
DATE:
FILE:
12345
A
B
C
D
A
B
C
D
12345
TS
CONSTRUCTION DOCS
EROSION CONTROL
DETAILS
C2.3
TS
24046
08/08/2025
SW
I
T
C
H
G
R
A
S
S
C
R
O
S
S
I
N
G
38
0
0
S
O
U
T
H
M
A
S
O
N
ST
--------
----
--------
FO
R
T
C
O
L
L
I
N
S
,
C
O
80
5
2
5
Va
l
u
e
24046_Erosion Control Details
REF PLAN
----2
3