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Home My WebLink AboutASPEN HEIGHTS STUDENT HOUSING - FDP - FDP130010 - SUBMITTAL DOCUMENTS - ROUND 2 - TRAFFIC STUDY~ B IOWEN GROUP, CONSULTING INC. July 1, 2013 Project File #: 11-385 City of Fort Collins Engineering Development Review 281 N. College Ave Fort Collins, CO 80522 Attention: Ms. Sheri Langenberger RE: Aspen Heights Student Housing Driveway Area Setbacks Dear Sheri , Following is a synopsis of the analysis done to determine the required setbacks for the respective off-street parking areas within the Aspen Heights Student Housing project. The analysis demonstrates that a setback of 40 feet is appropriate for all but two of the parking areas. A Modification of Standards is requested for those two parking areas. The Traffic Impact Study (TIS) prepared for the project predicts that the Average Daily Trip (ADT) total that will be generated by the development will be 2,180 vpd, based on a resident population of 716 students. The ADT total is equivalent to 3.04 trip ends per day per student. The daily traffic volume to and from the respective parking areas is calculated based on the number and type of housing units served by that parking area and the student occupancy rate of the respective buildings. The attached spreadsheet (Sht 1 of 2) demonstrates that no parking area driveway has an ADT greater than 750. All parking areas are accessed from public streets classified as "local". Thus, per LCUASS Figure 19-6, the required setback distance from the street flow line to the nearest parking stall will be determined by the average daily traffic volume in the adjacent street. For this analysis, distribution of the total predicted site generated traffic to the local streets in the development area (Lupine Drive and Blue Spruce Drive) is taken to be proportionate to the peak hour traffic volumes at the access points, as presented in the TIS. The spreadsheet attached shows that approximately 26% of the daily traffic (561 ADT) will access the site via Conifer Street and Blue Spruce Drive North; approximately 22% of the daily traffic (478 ADT) will access the site via New Vine Drive and Blue Spruce Drive South; and approximately 52% of the daily traffic (1 ,140 ADT) will access the site via Redwood Street and Lupine Drive East. Since the traffic volumes on Blue Spruce Drive North and South are both well below 750 vpd, the applicable setback for all parking areas accessed via Blue Spruce Drive is 40 feet, per LCUASS Figure 19-6. The maximum daily traffic volume on Lupine Drive, at the Redwood Street intersection, is greater than 750 vpd. However, not all traffic entering or exiting the site via this intersection will travel the full length of Lupine Drive. Instead, certain volumes of traffic will enter or exit the street at the various driveways served by Lupine Drive. The number of vehicles entering or exiting the street will typically be proportionate to the resident population served by those driveways and corresponding parking areas. Therefore, the traffic volume in the street will 3715 Shallow Pond Dr., Fort Collins, CO 80528 Phone (970) 226-0264 Fax (970) 226-3760 Ms. Sheri Langenberger RE: Aspen Heights Student Housing - Off-street Parking Area Setbacks July 1, 2013 Page 20f2 decrease with increasing distance from the access point at Redwood Street. The analysis presented in the attached spreadsheet shows that the daily traffic volume on Lupine Street drops below the 750-vpd threshold at the first pair of driveways west of Redwood Street, and at all locations west of the first two driveways, the street ADT will be less than 750 vpd. Since the driveway volumes are also less than 750 vpd, the required setback distance for the first parking stalls in each of these subsequent parking areas is 40 feet. The only parking areas where the criteria for the 40-foot setback are exceeded are the first pair of driveways west of Redwood Street. Given that these driveways are only two of the 17 driveways in the development, we request that a Modification of Standards be allowed for these two driveways. We trust that you will find the information presented here to be sufficient and acceptable. If you have questions or comments regarding this submittal, please contact me immediately and I will be pleased to discuss any items with you. Thank you for your consideration of this request. roup, Inc. Larry C. Owen, P.E. Attachments APSEN HEIGHTS STUDENT HOUSING Off-Street Parking Setback Analysis Parking Area ADT's Base Traffic Parameters from TIS - Total proiected number of residents: 716 - Total proiecled traffic volume: 2180 - Ava ADT per resident: 3.04 Building Occupancy & Traffic Generation Bide Tvoe Occuoancv Traffic Vol. A 4 12.18 B 6 18.27 C interior 2 6.09 C exterior 3 9.13 D 4 12.18 E 5 15.22 Parking Area Driveway Traffic Volumes Northwest Quadrant (East of Blue Spruce & North of Lupine) Northwest Quadrant (West of Blue Spruce & North of Lupine) Unit Type Quantity Residents Traffic Vol. A 4 16 48.7 B 3 18 54.8 C interior 6 12 36.5 C exterior 4 12 36.5 D 14 56 170.5 E 3 15 45.7 Totals 34 129 392.8 No. of Drivewav Entrances 2 Avg. ADT Volume per Driveway Entrance 196.4 Unit Tvpe Quantity A 1 B 0 C interior 0 C exterior 0 D 0 E 2 Totals 3 No. of Drivewav Entrances Avg. ADT Volume per Driveway Entrance I I Residents 4 0 a 0 0 10 14 Traffic Vol . 12.2 0.0 0.0 0.0 0.0 30.4 42.6 2 ill Southwest Quadrant (East of Blue Spruce & South of Lupine) Southwest Quadrant (West of Blue Spruce & South of Lupine) Unit Type Quantity Residents Traffic Vol. A 0 0 0.0 B 6 36 109.6 C interior 7 14 42.6 ASPEN HEIGHTS STUDENT HOUSING Off-Street Parking Setback Analysis Street Segment ADT's Base Trip Generation Parameters from TIS - Total projected number of residents: 716 - Total projected traffic volume: 2180 - Avg ADT per resident: 3.04 Street Segment Peak Hour Traffic Volumes at Access Intersections Street Seoment A.M. Peak Hour P.M. Peak Hour Dailv Avo. Volume Percent Volume Percent Percent Blue Spruce North (to Conifer) 46 25.41% 67 26.07% 25.74% Blue Spruce South (to New Vine) 40 22.10% 56 21 .79% 21 .94% Lupine East (to Redwood) 95 52.49% 134 52 .14% 52.31% 181 100.00% 257 100.00% 100.00% ADT Distribution by Street Segment Street Segment Dailv Avo . Distributed Percentaoe ADT Blue Spruce North (to Conifer) 25.74% 561 .2 Blue Spruce South (to New Vine) 21 .94% 478.4 Lupine East (to Redwood) 52 .31% 1140.4 100.00% 2180.0 ADT Distribution by Driveways Drivewav I.D. (West from Redwood) Resident Pop'n Served Drivewav ADT StreetADT West of DIW At Redwood St. 1140 1 North 85 259 881 1 South 57 174 708 2 South 55 167 540 2 North 54 164 376 3 South 59 180 196 3 North 44 134 62 ~th 56 171 -108 FE. ROW I I I I I Private I Parking I I I I ~--+---II-----r--~i~ I ~Minimum-...... o.....J.ff-St-re-e-t....l.pa-r-ki-ng-....I...---..L.- I Setback Distance to any parking stalls or drive aisle. (See Table below) Backof'--/ Sidewalk MINIMUM OFF STREET PARKING SETBACK DISTANCES (FT.) MINIMUM OFF STREET PARKING SETBACK DISTANCE PARKING LOT STREET CLASSIFICATION Volume Local Collector Arterial (ADT) <100 ADT 100-750 ADT >750 ADT <100 20' 40' 40' 50' 50' 100-750 20' 40' 50' 50' 75' >750 NA 50' 50' 60' 100' \ LARIMER COUNTY URBAN AREA DESIGN FIGURE REVISION NO: 1 nAI'fIV. C exterior 6 18 54.8 D 15 60 182.7 E 7 35 106.6 Totals 41 163 496.3 No. of Driveway Entrances 3 Avg. ADT Volume per Driveway Entrance 165.4 Unit Type Quantitv Residents Traffic Vol. A 1 4 12.2 B 0 0 0.0 C ,interior 0 0 0.0 C exterior 0 0 0.0 D 1 4 12.2 E 3 15 45.7 Totals 5 23 70.0 No. of Drivewav Entrances 3 Avg. ADT Volume per Driveway Entrance I I ~ Northeast Quadrant Southeast Quadrant Unit Type uantity Residents Traffic Vol. A 2 8 24.4 B 6 36 109.6 C interior 13 26 79.2 C exterior 10 30 91.3 D 12 48 146.1 E 7 35 106.6 Totals 50 183 557.2 No. of Drivewav Entrances 3 Avg. ADT Volume per Driveway Entrance 185.7 Unit Tvpe Quantitv Residents A 2 8 B 6 36 C (interior) 14 28 C exterior 16 48 D 10 40 E 8 40 Totals 56 200 No. of Driveway Entrances Avg. ADT Volume per Driveway Entrance I I Traffic Vol. 24.4 109.6 85.3 146.1 121.8 121.8 608.9 4 .!,g1