HomeMy WebLinkAboutMONTAVA - PHASE D CORE AND IRRIGATION POND - BDR240006 - SUBMITTAL DOCUMENTS - ROUND 2 - Variance Request (3)TST
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TST, INC. CONSULTING ENGINEERS
July 17, 2024
760 Whalers Way
Bldg C, Suite 200
Fort Collins, CO 80525
970.226.0557 main
303.595.9103 metro
970.226.0204fax
ideas@tstinc.com
www.tstinc.com
Brad Buckman, P.E.
City Engineer
City of Fort Collins
281 North College Ave.
Fort Collins, CO 80521
Re: Variance Request — 7.3.1.A. City of Fort Collins Classifications — 7-3F
Montava Phase D
TST Project No. 1230.0009.00
Dear Mr. Buckman:
We are hereby requesting a variance to the Larimer County Urban Area Street
Standards (LCUASS) for changes to the road geometry for Montava Phase D.
Current standard of Table 7-3 in section 7.4.1 of the Larimer County Urban Area
Street Standards (LCUASS), refers to road cross section geometry to be used in
road design for the Fort Collins area. A variance is being requested to this section
for use in the Montava Phase D project as noted below:
-Table 7-3 Fort Collins (GMA and City Limits) Street Standards — Technical
Design Criteria
- Proposed road — Longwood Drive - The road is in the Northeast corner of
the Montava Phase D site, at the intersection of Longwood Drive and Giddings
Road (see attached exhibits).
- The proposed street will vary as shown in the attached exhibits. Specific
changes focus on the centerline tangent length. According to Table 7-3 the
minimum centerline tangent length for a connector local residential is 100',
currently Longwood Dr has an interim tangent length of 67.5' before beginning the
centerline curve.
We are requesting a variance to this standard to provide connectivity through the
site until the ultimate design can be obtained. The ultimate design for the
Longwood Dr and Giddings Rd intersection will include a roundabout which will
satisfy any minimum tangent length requirements.
This variance request for change in centerline tangent length:
is not expected to have a negative impact on capital, or maintenance cost
requirements for the City, or property owners;
is not anticipated to reduce the life of the proposed roadways; and
is unlikely to be detrimental to the public health, safety/welfare, decreased
sight distance, or have any effect on turning movements.
❑
Thank you for your consideration in the approval of this variance request for the minimum
centerline tangent length for the Montava Phase D Giddings Rd/Lonwood Dr intersection. If you
have any questions, or require additional information, please do not hesitate to contact me
directly.
Respectfully,
TST, INC. CONSULTING ENGINEERS
Derek Patterson, P.E.
dpattersn(cr).tstinc.com
970.484.2128
■
Table 7-3
Fort Collins GMA and City Limits Street Standards - Technical Design Criteria
Design Element Arterial Collector Local Alley
4 or 6 lane 2 lane Major Minor Comm/Industrial Residential
Overall Design Parameters
Design Speed / 50/40-45 (6) 30/25 cannector
Posted Speed 50/35-45 (4 50/30-45 40/30-35 40/25-30 30/25 25/25 15
Stop in Si ht Distance 425 425 305 305 200' 200' 80
Horizontal Ali nment
Minimum centerline radius 1075' 1075' 600' 600' 275' 275' connector 50'
(with no super-elevation) 165'
Maximum su er-elevation 0.04 ft/ft 0.04 ft/ft 0.04 ffJft NA NA NA NA
Minimum tangent between curves or 200' 200' 150' 100' 100' 100' 20'
at intersections'
Vertical Ali nment
Maximum Centerline Grade 5% 5°/o 6% 8% 8°/o 8% 8%
Minimum Gutter Flowline Grade 0.5% 0.5°/o 0.5% 0.5% 0.5% 0.5% 0.5%
Minimum Crest 84 84 44 44 19 19 connector 3
K-values for Vertical 12 all others
Curves Sag 96 96 64 64 37 37 connector 10
26 all others
Intersection Desi n
Minimum sight distance at driveways 1030' 1030' 660' 660' 310' 260' 210'
and intersections
Without Witn Without With
Access Management Raised Raised Raised Raised
Median Median Median Median
Distance Si nalized 2640'SMin. 2640'SMin. NA NA NA NA NA
between 460' — 460' — 460' — 460' —
intersections2 Unsignalized 660' S 660' S 660' S 660' S 330' Min. 250' Min. 200' Min. 200' Min. NA
1320's 660'6 1320'6 660's
Min. Min. Min. Min.
Distance between high volume 460' — 460' — 460' —
driveways and intersectionsZ 660' S 660' S 660' S 330' 200' Min. 175' Min. 175' Min. 150' Min. NA
1320'� 660'6 1320'6 Min.
Min. Min. Min.
Distance between driveway edges 460' — 460' — 460' — 330' 75' Min. 30' Min. 30' Min. 12' Min. No Iimit
660' S 660' S 660' S Min.
660'6 660'6 660'6
Min. Min. Min.
Corner clearance between 460' — 660' S 460' — 660' S 175' Min. 100' Min. 175' Min. 50' Min. 40' Min.
driveways/alleys & street intersectionsZ
Drivewa approach street confi . 3 Radial curb return Radial curb return Curb cut 4 Curb cut 4 Curb cut 4 Curb cut' Curb cut'
1 Intersection tangents are measured from flowline of the intersected street at intersections. Note: Two curves in the same direction must be separated by a tangent at least two times the minimum tangent
lengths shown in Table 7-3 and Table 7-4.
2 These distances are measured as shown in Figure 9-1.
3 Table indicates residential driveways. All commercial driveways shall be constructed with radial curb returns (see Section 9.3.2).
4 Radial curb returns are also allowed where traffic volumes meet the requirements for a High Volume Driveway.
5 For a distance less than 460' an administrative variance must be approved by the Local Entity Engineer; for a distance greater than 660' a modification in accordance with the Land Use Code will be required.
6 Minimum spacing for full movement and/or potentially signalized intersections
Page 7-8 Larimer County Urban Area Street Standards — Repealed and Reenacted August 1, 2021
Adopted by Larimer County, City of Loveland, City of Fort Col�ins
LONGWOOD DR TANGENT VARIANCE
50 25 0 50
scale 1"=50' feet
MONTAVA PHASE D
DATE: JULY 17, 2024
JOB N0. 1230.0009.00
SHEET 1 OF 1
TST, INC. CONSULTING ENGINEERS
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Fort Coilina. Colorado