HomeMy WebLinkAboutGrading Plans - 08/12/2021Grading/Stormwater Plan Accepted
(Building Permit Released)
Accepted by: Dan Mogen
Date: 08/12/2021 HIGHLAND
�_"____ . =�.'T �L=P.VICES
Memorandum
T0: Kyle and Brandy Heustis
FROM: Adele McKenna, EI
Jason Claeys, PE
DATE: 8/12/21
PROJECT: Heustis Residence — 2209 Moffett Dr
HDS 106 N0: 21-1046-00
SUBJECT: Erosion Control
This memorandum has been prepared to describe the drainage impacts of the proposed changes and
provides impervious area calculations and comparisons for both the existing and ultimate conditions on
the property.
This project is located at 2209 Moffett Dr in Fort Collins and proposes the demolition of the existing house
and the construction of a new single-family residence while protecting the existing outbuildings in place.
The existing building proposed to be removed will not be removed immediately. The property owners are
living in the existing house while their new residence is being built. As part of the requirements to receive
their certificate of occupancy, the existing house will be removed. For the purposes of this analysis, we
are reviewing the impacts of the ultimate condition with the existing house removed and the new
residence completed.
Impervious are calculations and estimated runoff rates specific to 2209 Moffett Dr are attached for
reference. The rational method was utilized to estimate the peak runoff rates. The property is
approximately 4.7± acres and is currently 5.0% impervious. With the removal of the existing house and
construction ofthe new residence and driveway, it is estimated thatthe propertywill be 5.8% impervious,
an increase of 1,832 sqft of impervious area (roof, drive/walk, gravel areas). The associated 100-yr runoff
rates are 11.19 cfs under the existing conditions and 11.45 cfs under the proposed condition, a 0.26 cfs
increase. The outfall for this site is an existing 15" culvert crossing Moffett Drive.
To evaluate the overall impacts of the increase in impervious area, the overall basin that drains to the 15"
culvert under Moffett Dr was reviewed. LiDAR contours obtained from the City along with aerial imagery
were referenced to determine the approximate limits and impervious area of this basin. The basin is
approximately 16.8± acres and 15.2% impervious. With the proposed improvements associated with 2209
Moffett Dr, the overall impervious area is estimated to be 15.4%. The existing and proposed 100-yr runoff
rate is 48.03 cfs and 48.27 cfs, respectively. There is an estimated increase of 0.24 cfs in the overall basin,
a 0.5% increase. In our opinion, this increase is considered negligible in reference to the overall basin
runoff rates.
Since all impervious paved areas drain to pervious area (either sheet flow or roadside swales), paved areas
are assumed to be 90% impervious since the runoff has an opportunity to infiltrate prior to leaving the
analyzed basins.
Highland Development Services, Inc.
6355 Fairgrounds Avenue, Suite 100 � Windsor, CO 80550 � 970.674.7550
Heustis Residence
8/12/21
Page 2 of 2
The impervious percentage of 2209 Moffett is less than the assumed 30% imperviousness of the Spring
Creek sub-basin 141 in the area master plan, therefore, this lot does not require detention. The
disconnected impervious areas, on site swales, and roadside ditch provide sufficient water quality for this
property.
It is estimated that the area of disturbance is around 15,213±. A combination of rock socks and diversion
ditches are proposed to manage erosion control during construction prior to establishment of vegetation.
Reference the attached erosion control escrow calculation & proposed erosion control measures on the
attached Grading & Erosion Control Plan.
Based on this analysis of the existing and proposed conditions associated with the proposed
improvements at 2209 Moffett Dr, and the overall basin draining to the existing 15" culvert under Moffett
Drive, we don't believe that these improvements will have an adverse impact on the existing overall
drainage conditions.
Please do not hesitate to call (970.674.7550) or email (jclaeys@highland-ds.com) if there are any
additional questions.
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Erosion and Sediment Control Escrow/Security Calculation
for The City of Fort Collins
7/8/2021
Project: Heustis Residence
EROSION CONTROL BMPs
Diversion Ditch
Rock Sock
Vehicle Tracking Control Pad
Culvert Protection
BMP Amount
Estimated
Units Quantity
LF 135 $2.50
each 3 $150.00
each 1 $350.00
each 1 $150.00
Sub-Total:
1.5 x Sub-Total:
Amount of security:
Reseeding Amount
Seeding AC 0.35
Disturbed Acres: 0.35
Unit
Price
$
$
$
$
$
$
$
$2,000.00 $
Sub-Total: $
1.5 x Sub-Total: $
Amount to Re-seed: $
Miniumum Escrow Amount
Minimum escrow amount: Residential $
Total
Price
337.50
450.00
350.00
150.00
1,287.50
1, 931.25
1, 931.25
698.48
698.48
1,047.73
1, 047.73
1,500.00
Final Escrow Amount (Maximum between BMP, Reseeding and Minimum Escrow)
Erosion Confro/ Escrow: $ 1,931.25
"Tlie arnount of jhe securin� `nust be brrsed on one nn�! one-half times tlae estimnte of t/:e cost ta install t/te approved mensures, or one mtd one-l�alf Pirrtes
the cost to re-vesetnte dte dfsturbe�/ l�uid to dry land grasses based upon unit cost determi�zed by the Citp's Annual Revegetation antl StabiliZntion Bid,
whichever is grea/er. In iio instance, will the nmount of securily be less lhnn o�te thousanrl five liundred dollnrs ($1,500) for residential rfevelopment or
three t/eousand do/lnrs ($3,000) for com�reercial developrrrenP'
7/19/2021 6:32 PM G:\Projects�21-1046-00 Heustis Residence\03 Design Documents\Drainage\Erosion Contro1�2b1046-00 Erosion Control Escrow.xls
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