HomeMy WebLinkAboutOB 6 MEDIAN OPENING 12-17-90DATE:
TO:
FROM:
SUBJECT:
DECEMBER 11, 1990
WILLIAM A. HUSTON, CITY MANAGER
OLD BUSINESS NO. 6
12-17-90
Inter - Com
PUBLIC WORKS DEPARTMENT/ENGINEERING DIVISION
FEASIBILITY STUDY TO PROVIDE A MEDIAN OPENING ON TUSTIN
RANCH ROAD AT PALERMO
RECOMMENDATION:
The pleasure of the City Council.
BACKGROUND
The City Council, at their November 19, 1990, requested staff to
investigate the feasibility of cutting the raised median on Tustin
Ranch Road at Palermo to provide an opening for left turn access
into the Peters Tract (South of Irvine Boulevard).
A traffic impact study was conducted to determine the traffic and
circulation impacts associated with the Peters Tract. This tract
consists of 118 single family detached homes and is located on
Tustin Ranch Road between Irvine Boulevard and Parkcenter Lane.
Two access locations are provided for the tract, one at Palermo
from Tustin Ranch Road and the other one off Parkcenter Lane via
Monterey Street/Triburon Way.
Irvine Boulevard is a six -lane Major Arterial roadway located to
the north of the Peters Tract. This arterial currently services
traffic volumes on the order of 34,000 per day. Tustin Ranch Road
also has six lanes of traffic and is classified as a Major Arterial
roadway. Presently, this roadway services daily traffic volumes of
3,000 vehicles per day. Parkcenter Lane is a local collector with
current daily traffic volumes of 1,200 vehicles per day.
FINDINGS
The traffic generation potential of the Peters Tract is expressed
in vehicle trip ends, where a trip end is a one-way vehicular
movement either entering or departing the tract. The traffic
generation rates shown herein are based on data published by the
Institute of Transportation Engineers and assumes full occupancy of
the tract. For the purpose of assessing the overall impact of the
tract, trip generation rates and distribution assignments have been
used for a "worst case" analysis. Table 1 presents the traffic
generation relative to the existing Peters Tract.
Page 2
TABLE 1
TRIP GENERATION PROJECT TRAFFIC
DAILY AM PEAK HOUR PM PEAK HOUR
2 -WAY INBOUND OUTBOUND INBOUND OUTBOUND
Units RATE/TRIPS RATE/TRIPS RATE/TRIPS RATE/TRIPS RATES/TRIPS
Single 10.062/1,188 .204/24 .55/65 .633/75 .372/44
Family
Detached
Homes
118 Units
* DATA SOURCE is ITE- Trip Generation, 4th Edition, 1987.
As shown in the table this project area generates a total of 1,188
vehicles trips per day, evenly divided between inbound and outbound
movements. During the AM peak hour, a total of 89 trips would be
generated (24 inbound- 65 outbound) while the PM peak hour would
generate an estimated total of 119 trips (75 inbound- 44 outbound) .
The distribution and assignment of project traffic was based on a
review of current peak hour travel patterns. Exhibit 1 shows the
traffic distribution for the Critical AM, and PM peak hours as well
as 24 hour daily volumes. The total trip generation was analyzed
for each access entry point as a worst case scenario. Exhibit 1
also shows that during the critical PM peak hour, 41 left turns
would be generated if a left turn pocket was to be constructed on
Tustin Ranch Road. The construction of this left turn pocket is
physically possible with the construction cost estimated at $45,100
as shown in Exhibit 2. A detail sketch of the left turn pocket
design is shown in Exhibit 3. This design would restrict left turns
out of Palermo.
However, it should be pointed out that this left turn would be
uncontrolled which in turn would require a yield to on -coming
traffic. The current volume of traffic on Tustin Ranch Road is
approximately 3,000 vehicles per day. Future traffic projections
shown that this street will increase to 26,000 vehicles in the year
1995 and to 32,000 vehicles by the year 2010. Future traffic
volumes for Irvine Boulevard will exceed 40,000 per day by the year
2010. As soon as the Tustin Ranch Road interchange with the Santa
Ana Freeway is completed, the right turn demand off of Irvine
Boulevard will increase dramatically.
Page 3
This increased demand will utilized the right turn over lapping
green arrow currently installed at the intersection of Irvine and
Tustin Ranch Road. The utilization of this right turn arrow in
combination with future traffic volume demands on Tustin Ranch Road
will create insufficient gaps to allow left turns into Palermo
without excessive delays.
Traffic wishing to enter the Peters Tract can currently enter via
a controlled traffic signal at Parkcenter Lane. This entry adequately
provides access to the project area without the installation of an
additional left turn pocket on Tustin Ranch Road. It is the Staff's
feeling that money required to install the additional left turn pocket
should be used on other priority projects. There is no funding
available in the 1990-91 Budget for this project, and it has been
determined that Assessment District No. 85-1 funding could not be
utilized on this project.
Bob Ledendecker
Director of Public Works/City Engineer
BL: SD: cr
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Sandra Doubleday
Engineering Consultant
IRVINE
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EXHIBIT 2
CONSTRUCTION COST ESTIMATE
Tustin Ranch Road @ Palermo
Left Turn In Only Median Opening
12/10/907 by Jeff Chen
Unit
Description Quantity
Price
Cort
1.
Remove existing type A curb & gutter.
is
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$49000
Landscape and modify existing systems.
2.
Construct type A curb & gutter
300 if
$20Af
$67000
(12" gutter, 8"cf).
3.
Construct 0.40' A.C.
70 to
$80/tn
$51600
4.
Construct 1.65' Class II base
255 to
$20/tn
$51100
5.
Construct 4" thick stamped concrete
525 sf
$6/sf
$3,150
paving.
6.
Construct mow strip & 6" thick stamped
130 sf
$8/sf
$1,040
concrete drive apron and paving.
7.
Construct new striping and install new
is
Is
$11500
signs and pavement markers.
8.
Mobilization
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$19500
9.
Traffic control & lane closure
is
Is
$1,500
TOTAL
$29,390
Total
Construction Estimate $301000
Contingency (10%) 3,000
Subtotal $337000
Engineering Design (20%) 61600
Construction Survey 39000
Inspection 2,500
TOTAL $45,100
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