HomeMy WebLinkAboutRUDOLPH FARMS INFRASTRUCTURE PROJECT - FDP220010 - SUBMITTAL DOCUMENTS - ROUND 4 - VARIANCE REQUEST
NORTHERNENGINEERING.COM | 970.221.4158 VARIANCE REQUEST: RUDOLPH FARM
FORT COLLINS | GREELEY 1 | 2
VARIANCE REQUEST
January 18, 2023
City of Fort Collins
Development Review
281 N College Ave.
Fort Collins, CO 80524
RE: RUDOLPH FARM PROJECT
STREETS VARIANCE REQUEST - MINIMUM VERTICAL CURVE K-VALUE / MINIMUM GRADE BREAK
NORTHERN PROJECT #1896-001
To whom it may concern:
Northern Engineering would like to present this variance request for the Rudolph Farm project. General
information about the project is presented below, and detailed information about the nature of this request
follows.
General Information
The project site is located at the northeast corner of Prospect Road and I-25 in Fort Collins. The site
currently is used for agriculture, and this project is slated to develop multi-use “super-pad” sites which will
include, commercial, retail, and residential developments. The entire project site consists of approximately
115 acres.
Prospect Road
Part of the project includes widening Prospect Road at the south frontage of the property. In order to
connect to the existing improvements that were installed with the recently completed bridge across I-25,
two vertical curves must be used. In order to meet all other LCUASS requirements, the vertical curve (sag)
immediately east of the I-25 connection is currently designed with a K-value of 88.87 - slightly lower than
the LCUASS requirement of 96 for a sag curve in an arterial street. Since the connection point to the far west
has already been constructed, and to be able to achieve LCUASS design standards east of this sag (along
the frontage of the project site), including ensuring the adjacent sag curve does meet LCUASS standards,
we cannot extend the sag curve in question any further to increase its K-value.
We would like to request an alternative to the LCUASS minimum K-value requirement for vertical curves
(sags) – 88.0 – at the location described in Prospect Road, in order to achieve optimized design (and meet
other LCUASS requirements) through the rest of the Prospect Road design. Please see the Prospect Road
profiles shown on Sheet R1 in the accompanying drawing set for additional details and information
regarding this design point.
Carriage Parkway
Carriage Parkway is aligned north/south through the property and intersects with Prospect Road while
providing an access to the existing leg of Carriage Parkway that passes through the Fox Grove subdivision.
At the connection point to the Fox Grove subdivision, Carriage Parkway expands from 50’-wide (FL to FL) to
54’-wide as it continues through the Rudolph Farm property. City Staff is aware of the complications
encountered in making a connection to the existing portion of roadway to the north while maintaining
LCUASS standards and achieving proper drainage through the rest of the project site to the south. While
the Carriage Parkway centerline has been revised to meet LCUASS standards, the magnitude of grade
change in the immediate vicinity of the property boundary and the horizontal deflection in the roadway has
created a situation where it is effectively impossible to incorporate a grade break in the street flowlines that
NORTHERNENGINEERING.COM | 970.221.4158 VARIANCE REQUEST: RUDOLPH FARM
FORT COLLINS | GREELEY 2 | 2
VARIANCE REQUEST
is under 1.0% as required by LCUASS for sag curves (LCUASS section 7.4.1.B.3). The current grade break as
designed at this location is 1.6%.
We would also like to request a variance to the maximum allowed grade break in sag curve flow lines – 1.6%
instead of 1.0% - at the location in Carriage Parkway described above. Please see flowline profiles shown
on Sheet R6 in the accompanying drawing set for additional details and information regarding this design
point.
If you have any questions, please feel free to contact me directly.
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
AUSTIN SNOW, PE
Project Engineer