HomeMy WebLinkAbout1629 BLUE SPRUCE DRIVE - I-L SITE PLAN REVIEW - 90-88 - SUBMITTAL DOCUMENTS - ROUND 1 - TRAFFIC STUDY0o
MEMORANDUM
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To: John Horvat, V J Properties
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Jim Brannan, Dengler & Associates
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Pick Ensdorff, Fort Collins Traffic Engineer
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Ted Shepard, Fort Collins City Planner
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Fr-om: Matt Del ich`
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Date: October 24, 1988
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Subject: Traffic analyses related to 1629 Blue Spruce
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This memorandum documents the traffic analyses
performed related to the proposed expansion of 1629 Blue
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Spruce located in Evergreen Park in Fort Collins,
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Colorado. The analyses performed were: (1) obtain
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current traffic counts at the Willox/Blue Spruce and
Blue Spruce/Sundance/access intersections, (2) determine
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operational level of service, (3) trip generation, (4)
trip distribution, (5) traffic assignment, and (6)
determine the increase in traffic with the proposed
development of 1629 Blue Spruce. Also included in the
analyses was full occupancy of 1635 Blue Spruce, the
office building directly north of 1629 Blue Spruce. At
the present time, 1629 Blue Spruce appears to be vacant.
The building at 1635 Blue Spruce is less than half
occupied.
Afternoon peak hour traffic counts obtained in
October 1988 are shown in Figure 1. Based upon review
of daily counts in the area, it was determined that the
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afternoon peak hour would give a sufficient indication
of the current traffic in the area. In this type of
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the reasonable indication of the morning peak hour
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could be obtained by reversing the direction of the
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afternoon peak hour traffic.
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The (41 1 1 ox/B1 ue Spruce Intersection is a T
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intersection with stop sign control on Blue Spruce. The
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functional approach geometrics are through and turn
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lanes on all legs. The widths of both Wi11ox and Blue
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Spruce are 60 feet, however the actual striping is
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absent. Using the 1988 traffic counts, the operation at
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the Wi 1 1 ox/Blue Spruce intersection is at level of
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service A for all analyzed movement=_. This level of
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service indicates little or no traffic delays during the
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peak hour. The Blue Spruce/Sundance/ access intersection
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also operates at level of service A with the existing
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stop sign control on Sundance and the access. There are
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a number of similar sized offices further south on the
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west side of Blue Spruce. Multi -family residential
exists south of Wi11or, on the east side of Blue Spruce.
A schematic of the site plan is shown in Figure 2.
The existing access between 1629 and 1635 Blue Spruce
is, in fact, two accesses. There is a connection
bett,ieen the two parking areas approximately 30 feet west
of Blue Spruce. Since both accesses are two-way,
conflicts can occur in this area. The two accesses are
only 30 feet apart. This is not a good design.
Ideal 1 y, one access driveway should serve both
buildings. However, since this teas approved and bu i 1 t
some time ago, there is little that the City of Fort
Collins can do to change this. A minor access to Blue
Spruce is proposed near the south property line. This
serves as a second outlet for the parking area which
surrounds the building. This access has the potential
of relieving some of the pressure at the north access
which should improve operation at that intersection.
The trip generation for 1629 Blue Spruce and full
occupancy of 1635 Blue Spruce is shown in Table 1. The
use selected for 1629 Blue Spruce from the ITE Trip
Generation Manual was government office for the office
building and research center for the lab/museum
building. The government office use gave a. higher rate
than a general office building, which is more reflective
of the number of parking spaces provided on the site
plan. The use selected for 1635 Blue Spruce was general
office building. The trip distribution, based upon
current land uses and traffic counts is shown in Figure
3. The assignment of site (1629 Blue Spruce) generated
traffic is shoo-in in F i gure 4. The sum of the existing
plus site (1629 and 1635) generated traffic is shown in
Figure 5. The increase in traffic at the Willox/Blue
Spruce intersection due to the 1629 Blue Spruce
development is on the order of 65 percent. If future
traffic were considered, the contribution of the 1629
Blue Spruce development traffic would be less than 65
percent due to higher levels of background traffic in
future years. Table 2 shows the afternoon peak hour
operation at all the analyzed intersections. With the
1629 Blue Spruce development traffic and full occupancy
of 1635 Blue Spruce, operation at the Willox/Blue Spruce
intersection remains in the level of service A category
during the afternoon peak hour. Operation at the Blue
Spruce/Sundance/access, Blue Spruce/1629 Main Access,
and Blue Spruce/1629 South Access intersections will be
at level of service A during the afternoon peak hour
for all movements with stop sign control when looked at
as individual intersections. As long as traffic volumes
in this area are low, as they will likely be in the
short range future, the closeness of the 1629 and 1635
Blue Spruce main accesses should not present any
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operational problems. However, if traffic increases
significantly on Blue Spruce and both 1629 and 1635 Blue
Spruce are fully occupied, operational problems could
develop due to the proximity of these accesses. When/if
this occurs a solution, such
accesses should be developed.
interest of both the 1629 and
properties.
as consolidating these two
This would be in the best
1635 Blue Spruce
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Land Use
1629 Blue Spruce
Govt. Office -
31,148 SF
Lab/Museum -
8,216 SF
1635 Blue Spruce
General Office -
29,000 SF
Total
Table 1
Trip Generation
Daily A.M. Peale P.M Peak
Trips Trips Tripe. Trips Trips
in out in out
2513
179
35
34
175
44
9
1
1
7
357
51
6
9
47
2914
239
42
44
229
Table 2
Afternoon Peak Hour Operation
Intersection/Movement Level
of Service
Willox/Blue Spruce
NB
LT
A
NB
RT
A
WB
LT
A
Blue
Spruce/Sundance/1635 Access
NB
LT
A
SB
LT
A
WB
LT/T/RT
A
EB
LT/T/RT
A
Blue
Spruce/1629 Main Access
NB
LT
A
EB
LT/T/RT
A
Blue
Spruce/1629 South Access
NB
LT
A
EB
LT/T/RT
A
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1988 AFTERNOON PEAK HOUR TRAFFIC FIGURE 1
. WILLOX r
Lab /
Museum
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SUNDANCE
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SITE PLAN SCHEMATIC
FIGURE 2
50%
TRIP DISTRIBUTION
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SITE TRAFFIC ASSIGNMENT
(AFTERNOON PEAK HOUR)
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WILLOX
IJOM.
SUNDANCE
WILLOX
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FIGURE 3
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FIGURE 4
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s� WILLOX
34 �a
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1635 �-7
1 � � S M.
25 -� SUNDANCE
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51 �� l
42 �\ I
1629 Ir
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49 �` T
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EXISTING PLUS
SITE TRAFFIC ASSIGNMENT
FIGURE 5