Heartz Road/PP-CS 890412Jerry Parch Consulting Enginccrs
April 12, 1989
214/471-2251
RE:
JP No. 88009; Heartz Road; Parkway Boulevard to
Sandy Lake Road; Coppell, Texas
Dear Russell:
Enclosed are three sets of construction plans for Paving, Water,
Sanitary Sewer and Storm Drainage Improvements in proposed Heartz
Road between Parkway Boulevard and Sandy Lake Road. This current
submittal contains revisions of the plans that were originally
submitted on March 22, 1989 as requested by the Development
Review Committee.
In addition to the revised plans, attached is an investigation.of
proposed and future grades in Heartz Road through the Sandy Lake
Road intersection. This data is provided in response to a
request from Mr. Kevin Peiffer.
Major adjustments in the plans from
include:
the original submittal
1. The plat has been revised to include corner clips at
the Parkway Boulevard intersection.
o
o
o
Proposed easements for utility improvements in areas
adjacent to the dedicated Right-of-Way are shown on the
plat.
A type "Y" inlet has been added at the upstream end' of
Storm Sewer Line C on the west side of Heartz Road.
This inlet can be removed and the 48-inch pipe extended
west when this area develops.
Vertical curves have been added in the roadway profiles
at 1% grade breaks.
The 60° bend in Storm Sewer Line A near Sandy Lake Road
is deleted and a curve using bevelled pipe is designed
to turn the flow north in Heartz Road.
The profile in Heartz Road near Parkway Boulevard is
adjusted to Soften the grade break at the intersection.
320 V~estway Place, Suite 501 · Arlington, Texas 76018 · Metro (817) 467-2418 · (8!7) 465-0259
Mr. Russell Doyle, P.E.
JP No. 88009
April 12, 1989
Page 2 of 3
The method used to abandon the four existing sanitary
sewer manholes in Heartz Road is revised to comply with
comments received from the Department of Public Works.
The proposed sanitary sewer is concrete encased and
ductile iron pipe specified under the proposed box
culvert.
A 12-inch valve is added at the connection to the
sixteen-inch water line in Parkway Boulevard.
10.
Encasement pipe on the sanitary sewer bore
Parkway Boulevard is deleted.
under
In addition to these revisions, the following sheets
added to the plans since the March 22, 1989 submittal.
have been
Sheet No. 15 which shows proposed grading on property
owned by Parks of Coppell Joint Venture II necessitated
by proposed improvements in Heartz Road and in areas
adjacent to Sandy Lake Road.
Sheet Nos. 18-21 showing cross sections of proposed
Heartz Road.
The following issues are still under review.
Trench Safety - Upon receiving preliminary approval of
the proposed roadway grades and utilities from the
City, we will authorize the project geotechnical firm
to proceed with a site specific design of proposed
utility trenches and include this information in the
construction plans.
Facing Material on
currently studying
facilities.
Box Culvert Headwalls - We are
various options for these
C o
Easements for proposed utilities outside of the
dedicated street Right-of-Way will be submitted to the
City following execution by property owners.
At this time, we are anticipating starting construction of Heartz
Road in May, 1989. Due to the amount of fill required, the
initial construction effort will consist of a grading contract
for clearing the Right-of-Way and preparing the roadway subgrade.
Therefore, on behalf of my client and Parks of Coppell Joint
Venture II, please provide me a letter containing the following
information:
Mr. Russell Doyle, P.E.
JP No. 88009
April 12, 1989
PaGe 3 of 3
City approval of the proposed street Grades and
authorization to proceed with construction of Grades in
accordance with the plans.
Your schedule for City acquistion of
of-Way outside of the platted area.
remaining RiGht-
Your earliest response to this request is appreciated.
have any questions, please call. Thank you.
If you
Sincerely,
P.E.
JP:ch
Enclosure:
Previous Public Works Markup Set 7G ~}%/ '~-'
Previous Ginn Markup Set -re ~4 £J ~ ~,
Three Sets of Construction Plans - Revised
Analysis of Heartz Road Grades at Sandy Lake Road
cc:
Mr. Jay Chester, P.E./ABQ Development Corporation
Mr. Mike Allen/Parks of Coppell Joint Venture II
Mr. Dan Dowdey, P.E./Roberts & Dowdey Civil EnGineers
EVALUATION OF SIGHT DISTANCE
FOR
PROPOSED HEARTZ ROAD
AT
SANDY LAKE ROAD INTERSECTION
COPPELL, TEXAS
This data is presented to the City of CoDpell in compliance with
a request by the DRC from their review of proposed construction
Dlans of Heartz Road extending north of existing Sandy Lake Road.
Existing topography drops very steeply in the proposed Heartz
Road alignment north of Sandy Lake Road relative to the typically
mild to flat slopes found in the City of CopDell. Enclosed is a
copy of Exhibit A - "Heartz Road Profile at Sandy Lake Road"-
which was prepared to review sight distance considerations in
Heartz Road at this intersection. Since no adjustments are
planned in Sandy Lake Road at this time, current sight distances
in Sandy Lake Road at the existing intersection will remain
unchanged.
The proposed profile of Heartz Road extending north of Sandy Lake
Road is shown on Exhibit A as is the existing grade in Heartz
Road extending south of Sandy Lake Road. In addition an
anticipated future grade is shown across Sandy Lake Road at
Heartz Road when Sandy Lake Road is improved.
Evaluation of Sight Distance is based on guidelines provided by
the American Association of State Highway and Transportation
Officials (AASHTO) in A Policy on Geometric Desiqn of Highways
and Streets, 1984 hereinafter referred to as the "manual" Two
cases were studied. Case 1 is an evaluation of sight distances
in Heartz Road based on the proposed improvements north of Sandy
Lake Road with existing Sandy Lake Road and existing Heartz Road
south of Sandy Lake Road. Case 2 is an evaluation of sight
distances in Heartz Road based on an anticipated grade of Heartz
Road through the intersection when Sandy Lake Road is improved.
Case 1 - Existing Sandy Lake Road
For sight distance calulations, the manual states that the height
of the drivers eye is considered to be 3.5 feet above the road
surface and the height of the object should be 6 inches above the
road surface. Stopping sight distance is a combination of Brake
Reaction Time and Braking Distance. Design values for the
Stopping Sight Distance relative to design speed are shown in
Table III - 1 of the manual.
Prior to construction of improvements in Sandy Lake Road, all
traffic in Heartz Road should be required to stop before Going
through the intersection. Therefore all speeds on Heartz Road
through the intersection will be very slow. Exhibit A
demonstrates that sight distance from a vehicle travelling in
Heartz Road that is stopped on either side of the Sandy Lake Road
intersection is not limited by the roadway profile.
Case 2 - Heartz Road with Future Improved Sandy Lake Road
With future improvements in Sandy Lake Road, the intersection
with Heartz Road may be signalized. This will provide
opportunities for traffic in Heartz Road to proceed through the
intersection at design speeds. Drivers should be able to see
through the intersection a sufficient distance in time to stop
before reaching vehicles exiting future or existing cross streets
or driveways.
According to Table III - 1 of the manual, at a design speed of 35
mph, minimum stopping sight distance is 225-250 feet. From
Exhibit A, with proposed Grades in Heartz Road north of Sandy
Lake Road, existing Grades south of Sandy Lake Road and
anticipated future Grades through the intersection, the minimum
sight distance is approximately 275 feet, based on AASHTO
criteria.
The anticipated future Grade of Heartz Road through the Sandy
Lake Road intersection is approximately 34. Raising the roadway
elevation on the south side of Sandy Lake Road in order to
flatten the future Grade through the intersection in not advised
since this will result in decreased stopping sight distances.
Please let us know if we can provide any additional information.
By:
Jerry Parche' Consulting EnGineers
; i