HomeMy WebLinkAboutRIDGEWOOD HILLS - FDP230019 - SUBMITTAL DOCUMENTS - ROUND 3 - Variance Request
5265 Ronald Reagan Blvd., Suite 210
Johnstown, CO 80534
970.800.3300 • GallowayUS.com
September 27, 2024
Engineering Development Review
City of Fort Collins
281 N College Avenue
Fort Collins, CO 80524
RE: Ridgewood Hills Filing No. 5 - Variance Request to Stormwater Development Construction
Standards (with Louden Irrigation Ditch)
Please find this letter as our formal request for an administrative variance to the requirements set forth
within the Fort Collins Utilities Stormwater Development Construction Standards as they relate to as
they relate to depth of cover over proposed irrigation pipes. The project, Ridgewood Hills Filing No. 5,
is located at the southwest corner of the intersections of Triangle Drive and US 287 in the City of Fort
Collins. Utilities, including public sanitary sewer, public water, a private irrigation ditch, and roadway
improvements are proposed with the development. A portion of the Louden Irrigation Ditch bisects the
existing project site. The ditch enters the site at the south property boundary, where it meanders
across the property, generally from south to north. The ditch enters a culvert near the north property
line at Triangle Drive where it passes under the street and resumes open-channel flow north of
Triangle Drive. The Ridgewood Hills Fifth Filing project requires the relocation of the ditch. The ditch
will still enter the site at the south property boundary where it will continue in its current configuration to
a point north and west of the large existing wetland at the southwest corner of the site. There, the ditch
will be intercepted and conveyed via an underground pipe system to the northeast. The ditch then
resumes open-channel flow as it crosses onto a neighboring property to the east. It is then intercepted
again with an underground pipe system as it re-enters the site further north and continues toward the
culvert at Triangle Drive via a combined open channel and underground piping system. A portion of the
open-channel conveyance north of Castle View Drive will be within the existing ditch before being
intercepted again by an underground piping system directed to the culvert at Triangle Drive. The ditch
continues its current conveyance pattern north of the Triangle Drive culvert. This is location where the
ditch does not meet the 3’ cover requirements stated Per detail D-1 of the City of Fort Collins
Stormwater Construction Details and LCUASS 12.2.2 Minimum Depth which states all utilities shall be
located at least 2 feet below the scarified subgrade elevation, unless specifically approved to be less
by the Local Entity Engineer. Greater depth of cover may be specified by the Local Entity Engineer.
We would like to request a variance to Stormwater Development Construction Standards to allow for
the reduced depth of cover on the proposed irrigation pipe A. The vertical profile of Strasburg Drive is
constrained between its connection point in Triangle Drive and its southern terminus at the property
line. Irrigation A is proposed to exceed minimum pipe size (15”) and but not the slope requirements
(0.5%) for utilities within the Right-of-Way. The minimum pipe constraints allow for adequate
conveyance while still providing at least 30” of cover on top of the pipe, except for approximately 100’
where the pipe first passes under Strasburg Drive. In this area cover will be less than 24” therefore
Claas IV RCP will be provided from right-of-way to right-of-way. Further, the proposed profile of
Irrigation A is limited by the north tie in point of the Louden Irrigation Ditch.
Goodwin Knight
Ridgewood Hills Fifth Filing
June 12, 2024
Galloway & Company, Inc. Page 2 of 2
Thank you for your consideration of this variance request. Should you have any questions, please do
not hesitate to contact me 970.800.3300.
Sincerely,
GALLOWAY
James E Prelog, P.E.
Civil Engineering Project Manager
970.800.3300
JamesPrelog@GallowayUS.com
cc: