HomeMy WebLinkAboutENCLAVE AT REDWOOD - FDP220014 - DOCUMENT MARKUPS - ROUND 1 - EROSION CONTROL LETTER/REPORT (2)Project: Disturbed Acres:29.66
EROSION CONTROL BMPs Units
Estimated
Quantity
Unit
Price
Total
Price
L.F. 0 $2.50 $0.00
L.F. 0 $5.00 $0.00
EA. 41 $100.00 $4,100.00
EA. 0 $50.00 $0.00
L.F. 0 $2.50 $0.00
Sub-Total: $4,100.00
1.5 x Sub-Total: $6,150.00
Amount of security: $6,150.00
Total Acres x Price/acre: $59,320.00
$2,000.00 Sub-Total: $59,320.00
1.5 x Sub-Total: $88,980.00
Amount to Re-seed: $88,980.00
Minimum escrow amount: $3,000.00
Erosion Control Escrow:$88,980.00
Fields in yellow should be amended for this project.
Miniumum Escrow Amount
Enclave at Redwood
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)
Final Escrow Amount
Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
BMP Amount
Silt Fence (SF)
Rock Socks (RS)
Sockpile Protection
Reseeding Amount
Construction Fence (CF)
10/18/2022 12:35 PM K:\201013\Documents\Erosion\Cost Estimates\SWMP Escrow.xls
Summary of Comments on FDP220014 - Enclave at Redwood Rnd 1pdf.pdf
Page: 9
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 1:45:25 PM
Calculation sheet needs all BPM's from ESC Plan and quantities. Also Disturbed Area needs to be the same as the ESC Plan per FCSCM Ch. 2 Sec. 6.7.5
EROSION AND SEDIMENT CONTROL PLAN
FOR
ENCLAVE AT REDWOOD
FORT COLLINS, CO 80524
October 19, 2022
Prepared for:
9555 S Kingston Ct
Suite 200
Englewood, CO 80112
Prepared by:
Rachel Patton, P.E.
1120 Lincoln Street, Suite 1000
Denver, CO 80203
Ph: 303-623-6300, Fax: 303-623-6311
Harris Kocher Smith Project No.: 201013
Page: 12
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 11:52:08 AM Erosion Control Reports must be stamped by licensed PE for final acceptance per FCSCM Chap. 2 Sec. 6.1.4 Author: ACrecca Subject: Sticky Note Date: 10/28/2022 12:06:23 PM
Title page missing required items (Owner, Developer, Contractor and EC Administrator contact info) per FCSCM Chap.2 Sec. 6.1.4.1
Stormwater Management Plan
Enclave at Redwood
Page 4 of 9
October 19, 2022
The Site generally slopes from west to east at grades between roughly 0.3% and 1% towards Lake
Canal. The side slopes of the canal vary from 2:1 to 4:1. The thalweg slope of the canal is very flat.
During irrigation flows in the canal, the canal flows to the northeast along the east property
boundary. Perimeter silt fence will contain stormwater run-off onsite. There are currently no existing
stormwater or erosion control measures on-site.
The Redwood Meadows Pond has existing wetlands area which is adjacent to the northwest corner
of the site. The wetlands boundary is approximately 10’ feet away from the property line. The
wetlands area is approximately 0.53 acres. There is an additional pond to the northeast. This pond is
the Evergreen East Pond which has approximately 1.64 acres of wetland. The city owned ditch on the
north side of the site connects these two wetland areas. Perimeter controls will be implemented
along the south edge of the city owned ditch to retain stormwater onsite. Impacts to the wetlands
are not anticipated at this time and erosion measures will be put in place to contain stockpiles and
protect the Redwood Meadows Pond and wetlands from any site runoff.
There are three soil types as identified by the Natural Resource Conservation Service (NRCS) Web
Soil Survey. Loveland Clay Loam, Nunn Clay Loam, and Nunn Clay Loam (wet). All soil on site is
classified as hydrologic soil group C. These soils are cohesive and are moderately resistant to wind
and water erosion. A copy of the soil survey is included in Appendix B.
Ground water was also encountered during initial soil testing. Groundwater depths range from 8-12
feet from existing grade and will eventually be 8-17 feet under finished proposed grades.
Groundwater was not sampled and tested for any existing contamination. Soil testing did not show
any ground contamination.
The Site is shown on the Federal Emergency Agency’s (FEMA) Flood Insurance Rate Map (FIRM)
Community Panel Numbers 08069C0977G and 08069C0981G, effective June 17, 2008. Lake Canal is
partially located within Zone X (0.2% annual chance flood hazard) and therefore the Site is partially
within this zone. Because the development of the Site will not involve altering of Lake Canal, no
floodplain modifications are necessary. Please refer to Appendix A for more details.
VI. Existing Vegetation
Currently, the Site consists of mostly native grasses and vegetation. Vegetation covers approximately
98% of the site. There is very little impervious area onsite, if any, in the current condition.
VII. Potential Pollution Sources
The construction activities associated with this project will have some potential to pollute the
storm water being discharged from the Site. If these erosion measures are not properly installed
off-site sediment may occur with large stormwater flows. This has potential to damage the
surrounding wetlands. Below are the pollutants with a short description of each:
Page: 15
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 12:53:36 PM Please add items 5,9,and 14 and indicate if any potential sources of pollution are present on site per FCSCM Ch.2 Sec. 6.1.4.4
Stormwater Management Plan
Enclave at Redwood
Page 6 of 9
October 19, 2022
Dust or Particulate Generating Processes
Significant dust or particulate generating processes are a potential pollution source for the Site.
Dust mitigation, surface roughening, and seeding and mulching shall be implemented to mitigate
airborne dust pollutants. These activities will be need to be conducted in accordance with the City
of Fort Collins Fugitive Dust Ordinances. The Dust Control Manual can be found at
www.fcgov.com/dust
On-Site Waste Management Practices
On-site waste management practices (waste piles, liquid wastes, dumpsters, etc.) are not a
potential pollution source for the Site during stockpile activities.
Concrete Truck/Equipment Washing
Concrete truck and equipment washing is not a potential pollution source for the Site and should
only occur at the designated Concrete Washout Area shown on the SWMP.
Dedicated Asphalt and Concrete Batch Plans
Dedicated asphalt and concrete batch plants are not a potential pollution source for the Site. There
will not be any dedicated concrete or asphalt batch plants on site.
Non-Industrial Waste Sources
Non-industrial waste sources such as worker trash and portable toilets are not potential pollution
source for the Site.
Other Areas or Procedures Where Potential Spills Can Occur
Other areas or procedures where potential spills can occur are not a potential pollution source for
the Site.
VIII. Potential Non-Stormwater Discharges
Non-stormwater components of discharge, such as condensate from construction trailers,
underground springs and landscape irrigation return flow are not anticipated to occur with this
development. However, the contractor shall be responsible to monitor for such discharges and notify
the engineer in such an event. If construction dewatering is necessary, the contractor shall be
responsible for ensuring a construction dewatering permit is obtained prior to discharging water to
surface water or storm sewer systems.
IX. Receiving Water(s)
During high stormwater events, the Site currently drains to the lake canal ditch, city owned ditch and
some minor flow may make its way into the redwood meadows pond. There are no controls on site
to direct run off in any concentrated direction. According to the EPA, there are two receiving waters
for this Site; Dry Creek which is the receiving water for the North East College Corridor Outfall
(NECCO) and Timnath Reservoir which receives irrigation water from Lake Canal Reservoir Company.
Page: 17
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 12:16:03 PM please provide a pathway to the nearest receiving waters (From the outfall point(s) of the project and the flow path to Fossil Creek Reservoir or the Poudre River with directions and distances) per FCSCM Ch. 2 Sec. 6.1.4.3
Stormwater Management Plan
Enclave at Redwood
Page 9 of 9
October 19, 2022
Seeding and Mulching (SM)
Measures that include means to return the exposed dirt to a stabilized condition, one what will not
continue to result in erosion or sediment transport. A City approved seed mix will be applied to
stabilize the stock pile until final grading activities have commenced.
Street Sweeping (SS)
Street sweeping and vacuuming is to remove sediment that has been tracked onto roadways to
reduce sediment transport into storm drain systems or a surface waterway. This can be done
manually or with specific vehicles designed for this purpose. Street sweeping should be performed
in periodic intervals and when there is noticeable sediment accumulation.
XIII. SWMP Administrator
The stormwater management plan (SWMP) administrator shall be the Construction Site
Superintendent.
The Site superintendent is responsible for implementing and maintaining the Stormwater
Management Plan.
The SWMP administrator shall contact the engineer of record for development and revisions of
the SWMP.
The SWMP administrator shall be responsible for reporting spills.
The SWMP administrator shall conduct Site inspections and shall verify that repairs to the BMPs
have been completed and certify corrections.
The SWMP administrator shall conduct BMP training.
XIV. Final Stabilization and Long-Term Stormwater Management
Upon the completion of stockpiling activities, proper stabilization and vegetation will be established
with a native seed mix. Disturbed open space areas and the stock pile area will be planted with Native
Seed. Disturbances are to be minimized, especially on slopes greater than 4:1. Final stabilization is
reached when all soil-disturbing activities at the Site have been completed, and uniform vegetative
cover has been established with a density of at least seventy percent of pre-disturbance levels or
equivalent permanent, physical erosion reduction methods have been empl oyed. Soil compaction
will be minimized for areas where final stabilization will be achieved through vegetative cover or an
infiltration control measure.
Seeding needs to comply with City of Fort Collins landscape standards. See Stockpile plan notes to
establish proper native seed application and acceptance. All seeded areas will be crimped and
mulched same day or next day after seeding in accordance with the Temporary and Permanent
Seeding Details associated with this project as seen in the appendix, and in accordance with the City
of Fort Collins Erosion Control Criteria. Once installed there will be no temporary irrigation system so
all seeding will be monitored until the site has reached a vegetative cover (density) of 70%. It is
anticipated that this site will be seeded in the spring of 2023 and will be fully established in the fall
of 2026. At the point the vegetation has reached 70% density, and confirmed by the City of Fort
Collins, the warranty period for Erosion Control will begin, all stormwater infrastructure will be
cleaned and removed of any sediment deposits and any remaining temporary Control Measures will
be removed.
Page: 20
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 1:00:46 PM Indicate Soil perpetration and amendments in accordance with Municipal Code 12-123 as per FCSCM Ch.2 Sec. 6.1.4.9 Author: ACrecca Subject: Sticky Note Date: 10/28/2022 1:06:15 PM
Please provide a discussion of sediment removal from all pipes, drainage ways and other stormwater structures. Describe how the sediment will be disposed of correctly before the last remaining temporary Control Measures are removed from the project and the project has achieved final stabilization per FCSCM Ch.2 Sec.6.1.4.9
Filepath: K:\201013\ENGINEERING\EROSION\SWMP - STOCKPILE - COVER.DWG Layout: LAYOUT12 XREFs: dhic logo, vic mapPlotted: TUE 10/18/22 3:44:07P By: Miles SustadNO CHANGES ARE TO BE MADE TO THIS DRAWING WITHOUT WRITTEN PERMISSION OF HARRIS KOCHER SMITH.Know what's below.Call before you dig.
®
1120 Lincoln Street, Suite 1000
Denver, Colorado 80203
P: 303.623.6300 F: 303.623.6311
HarrisKocherSmith.com
ISSUE DATE:
DATE REVISION COMMENTS
PROJECT #:20101310-19-2022
ENCLAVE AT REDWOOD
SITUATED IN THE SOUTHEAST QUARTER OF SECTION 1, TOWNSHIP 7
NORTH, RANGE 69 WEST OF THE SIXTH PRINCIPAL MERIDIAN
CITY OF FORT COLLINS, COUNTY OF LARIMER, STATE OF
COLORADO
TEMPORARY EROSION AND SEDIMENT CONTROL
PLANS (TESC)
SCALE: 1" =
VICINITY MAP
900'
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1120 Lincoln Street, Suite 1000
Denver, Colorado 80203
P: 303.623.6300 F: 303.623.6311
HarrisKocherSmith.com
CALCULATIONS CHART
TOTAL DISTURBED AREA 30.67 ACRES
TOTAL "ONSITE" AREA OF DISTURBANCE 26.31 ACRES
TOTAL "OFFSITE" AREA OF DISTURBANCE 4.36 ACRES
TOTAL STORAGE/STAGING AREA 19.14 ACRES
TOTAL HAUL ROADS AREA
CONSTRUCTION VEHICLE TRAFFIC AREA
EST. PERCENT OF PROJECT AREA
EXPOSED N/A
EST. PERCENT VEGETATIVE COVER 98%DENSITY
EXISTING SOIL TYPE
LOVELAND CLAY
LOAM, NUNN CLAY
LOAM, AND NUNN
CLAY LOAM (WET)
GROUNDWATER DEPTH 7-17 FEET
NUMBER OF PHASES W/ PROJECT 1
TOTAL VOLUME OF IMPORTED (+) /
EXPORTED (-) MATERIALS 0 CUBIC YDS.
TOTAL AREA OF STOCKPILLING OR FILL OR
BORROW AREAS OFF SITE 0 ACRES
STEEPEST SLOPE 3:1 H:V
DISTANCE FROM A RIPARIAN AREA OR
SENSITIVE AREA 10 FEET
ABBREVIATIONS
BOP BOTTOM OF PIPE
BS BOTTOM OF STEP
BW BOTTOM OF WALL (FG)
CONC CONCRETE
DIA DIAMETER
DIP DUCTILE IRON PIPE
DR DOOR
DS DOWNSPOUT
E EAST, EASTING
EGL ENERGY GRADE LINE
EL ELEVATION
EOA EDGE OF ASPHALT
EOC EDGE OF CONCRETE
EOP EDGE OF PAVEMENT
ESMT EASEMENT
EX EXISTING
FES FLARED END SECTION
FF FINISHED FLOOR
FG FINISHED GRADE
FH FIRE HYDRANT
FLOW LINE
GB GRADE BREAK
GV GATE VALVE
HC HANDICAP
HGL HYDRAULIC GRADE LINE
HORZ HORIZONTAL
HP HIGH POINT
INV INVERT
LP LOW POINT
LSD LANDSCAPE DRAIN
MAX MAXIMUM
MH MANHOLE
MIN MINIMUM
MJ MECHANICAL JOINT
N NORTH, NORTHING
PHS PHASE
PR PROPOSED
PVC POLYVINYL CHLORIDE
RCP REINFORCED CONCRETE PIPE
ROW RIGHT-OF-WAY
SAN SANITARY
SS SANITARY SEWER
STA STATION
STM STORM
TB THRUST BLOCK
TBC TOP/BACK OF CURB
TOP TOP OF PIPE
TS TOP OF STEP
TW TOP OF WALL (FG)
TYP TYPICAL
UG UNDERGROUND
VERT VERTICAL
WAT WATER
SHEET INDEX
Sheet Number Sheet Title
1 COVER
2 NOTES
3 INITIAL TESC PLAN
4 INTERIM TESC PLAN
5 FINAL TESC PLAN
6 DETAILS
7 DETAILS
8 DETAILS
9 DETAILS
PRELIMINARY
NOT FORCONSTRUCTION
Page: 58
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 11:33:31 AM Provide sequencing per FCSCM Ch 2 Sec. 6.1.3.2 Author: ACrecca Subject: Sticky Note Date: 10/28/2022 11:34:36 AM
Plans and reports need to be stamped by a licensed PS per FCSCM Ch.2 Sec. 6.1.3
VTC
RS RS IP
IP
IP
LOC
CF
SF
LOC
CF
SF
SS
CWA
SSA
SHEET NUMBER
ISSUE DATE:
DATE REVISION COMMENTS
DESIGNED BY:
CHECKED BY:
DRAWN BY:
PROJECT #:
1120 Lincoln Street, Suite 1000
Denver, Colorado 80203
P: 303.623.6300 F: 303.623.6311
HarrisKocherSmith.com
Know what's below.Call before you dig.
®FILEPATH: K:\201013\ENGINEERING\EROSION\SWMP - STOCKPILE.DWG LAYOUT: LAYOUT110 XREFs: cd-dhic logo, e-base, e-legal, e-offsite, e-util, keymap - offsite, p-base[U], p-legal[U], p-water[U], stamp-swmpPLOTTED: TUE 10/18/22 3:44:23P BY: MILES SUSTAD201013
ENCLAVE AT REDWOOD
INITIAL TESC PLAN
PRELIMINARY STOCKPILE 3
3 OF 9
10-19-2022
CLH
RCP
CLH
NO CHANGES ARE TO BE MADE TO THIS DRAWING WITHOUT WRITTEN PERMISSION OF HARRIS KOCHER SMITH.0
SCALE: 1" =
100 100 200
100'
LOC
CF
SF
VTC
IP
RS
SP
SS
MATCHLINE - SEE THIS SHEET
MATCHLINE - SEE THIS SHEET
KEY MAP
PRELIMINARYNOT FORCONSTRUCTIONCWA
SSA
Page: 60
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 11:41:21 AM Please provide flow arrows for proposed construction including all curb and gutters marked with flow arrows per FCSCM Cg.2 Sec. 6.1.3.3
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SHEET NUMBER
ISSUE DATE:
DATE REVISION COMMENTS
DESIGNED BY:
CHECKED BY:
DRAWN BY:
PROJECT #:
1120 Lincoln Street, Suite 1000
Denver, Colorado 80203
P: 303.623.6300 F: 303.623.6311
HarrisKocherSmith.com
Know what's below.Call before you dig.
®FILEPATH: K:\201013\ENGINEERING\EROSION\SWMP - INTERIM.DWG LAYOUT: LAYOUT16 XREFs: dhic logo, e-base, e-legal, e-util, keymap, stamp-dpPLOTTED: TUE 10/18/22 3:44:59P BY: MILES SUSTAD201013
ENCLAVE AT REDWOOD
INTERIM TESC PLAN 4
4 OF 9
10-19-2022
CLH
RCP
CLH
NO CHANGES ARE TO BE MADE TO THIS DRAWING WITHOUT WRITTEN PERMISSION OF HARRIS KOCHER SMITH.0
SCALE: 1" =
100 100 200
100'
LOC
CF
SF
VTC
IP
RS
SP
SS
KEY MAP
MATCHLINE - SEE THIS SHEET
PRELIMINARYNOT FORCONSTRUCTIONMATCHLINE - SEE THIS SHEET
Page: 61
Author: ACrecca Subject: Sticky Note Date: 10/31/2022 8:50:10 AM No EC measurer indicated along LOC containing SS Sewer service heading off site east to Lemay ave. Please verify if excavation or disturbance will occur in this area.
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DSRAMP
SHEET NUMBER
ISSUE DATE:
DATE REVISION COMMENTS
DESIGNED BY:
CHECKED BY:
DRAWN BY:
PROJECT #:
1120 Lincoln Street, Suite 1000
Denver, Colorado 80203
P: 303.623.6300 F: 303.623.6311
HarrisKocherSmith.com
Know what's below.Call before you dig.
®FILEPATH: K:\201013\ENGINEERING\DRAINAGE\DETENTION PLANS.DWG LAYOUT: POND310 XREFs: aerial[U], cd - drainage map labelling[U], dhi_logo, e-base, e-legal, e-offsite[U], e-util, p-base, p-legal[U], p-utilPLOTTED: WED 10/19/22 8:51:04A BY: RACHEL PATTON201013
ENCLAVE AT REDWOOD
POND 3 PLAN 101
101 OF 140
10-19-2022
AML
MAW
JMR
NO CHANGES ARE TO BE MADE TO THIS DRAWING WITHOUT WRITTEN PERMISSION OF HARRIS KOCHER SMITH.KEY MAP
SCALE 1" = 500'REDWOOD STSUNIGA DR NORTHFIELDDEVELOPMENT0
SCALE: 1" =
30 30 60
30'
0
SCALE: 1" =
10 10 20
10'
Page: 68
Author: ACrecca Subject: Sticky Note Date: 10/28/2022 11:49:25 AM Please provide details for LID (Underground Detention Systems) as well as erosion control notes for protecting LID's during instillation and construction