Heartz Road/PP-CS 881201Jerry Parch Consulting Engineers
December 1, 1988
Ms. Taryon Bowman
Planning & Zoning Coordinator
City of Coppell
P O Box 478
Coppell, Texas 75019
214/462-0022
RE:
JP No. 88009; Heartz Road Preliminary
Plat; Coppell, Texas
Dear Taryon:
Enclosed are six prints of the Preliminary Plat of Heartz Road
from Sandy Lake Road to Parkway Boulevard and two prints each of
the Water and Sewer Plan, Drainage Plan, and the Conceptual
Landscape Plan showing proposed facilities in the Heartz Road
Right-of-Way. Also enclosed is a copy of a letter report to Mr.
Jay Chester of ABQ Development Corporation dated November 17,
1988, giving the results of a study prepared by our firm of
sanitary sewer facilities in the platted section of Heartz Road.
An exhibit showing the sanitary sewer service area is attached
with the aforementioned letter report.
This letter and the enclosed drawings are submitted to the City
in response to comments on the original submittal that were
provided at the Development Review Committee meeting on October
25, 1988. Following is a summary of the major issues and our
responses.
1. West half of the proposed Right-of-Way for 621 feet
north of Sandy Lake Road.
The centerline of Heartz Road north of Sandy Lake Road
coincides with the east property line of the Town
Center Site. Survey studies have determined that a
strip of land of unknown ownership lies between the
Parks of Coppell Joint Venture II property and the Ruth
Perkins property north of Sandy Lake Road. This strip
of land constitutes most of the remaining 30 feet of
Right-of-Way required for Heartz Road in this area.
The balance of the eastern half of the Right-of-Way
between Sandy Lake Road and the ABQ property must be
obtained from the Perkins tract.
320 VYestway Place, Suite 501 · Arlington, Texas 76018 * Metro {8! 7] 467-2418 · (817) 465-0259
Ms. Taryon Bowman
JP No. 88009
December 1, 1988
Page 2 of 4
ABQ Development has requested the Coppell office of
Ticor Title to research title to this strip of land
north of Sandy Lake Road and to establish current
ownership of the Perkins tract. A copy of the letter
report received from Ticor Title is attached to this
letter.
ABQ Development and the Parks of Coppell Joint Venture
II (PCJV II) have committed financial resources to
construct Heartz Road where the proposed roadway is
located on their respective properties. Since only
one-half of the roadway Right-of-Way is located within
the ownership of either PCJV II or ABQ for 621 feet
north of Sandy Lake Road, and since no legal
authorization has been secured to construct any
improvements outside of the limits of PCJV II or ABQ
property, a variance to construct only the west half of
Heartz Road is requested in this area. ABQ and PCJV II
will provide sanitary sewer, water and storm drainage
facilities in the proposed half street section. In
addition, if either the property owner or the City of
Coppell will agree to pay for construction of the west
half of the roadway adjacent to the Perkins tract, ABQ
will provide engineering to design the full roadway
section in this area.
2. 209 feet centerline radius south of Parkway Boulevard
Development Review Committee comments indicate that the
Subdivision Ordinance requires a minimum radius of 425
feet for any street within the City. This minimum
radius is based on a design speed of 30 m.p.h. Many
streets, however, have centerlines with a radius
considerably less than 425 feet.
A variance is requested to permit a 209 foot centerline
radius in Heartz Road south of Parkway Boulevard in
order that the roadway centerline may coincide with the
property line between the PCJV II and ABQ properties.
Technical justification for this request is based on
the location of the radius in question and traffic flow
in the proposed intersection.
Ail traffic on proposed Heartz Road just south of
Parkway Boulevard will be in a "Stopping" or
"Accelerating Condition". No through traffic will
occur since Heartz Road will not be continued north of
Parkway Boulevard. Therefore vehicle speed in the
proposed 209 foot radius curve should be substantially
Ms. Taryon Bowman
JP No. 88009
December 1, 1988
Page 3 of 4
less than the design speed typically used for collector
or even local streets since the location of this curve
is at an intersection where traffic is required to come
to a complete stop or execute a 90 degree turn upon
entering or leaving the 209 foot radius curve.
Sanitary Sewer Capacity
We have prepared an analysis of the sanitary sewer
facilities in Heartz Road north of Sandy Lake Road in
the Right-of-Way being platted. A copy of our letter
report and exhibit showing the sanitary sewer service
area is enclosed.
The results of our study indicate that the capacity of
the existing eight-inch sanitary sewer from
approximately 1000 feet north of Sandy Lake Road to
Parkway Boulevard is deficient with a fully developed
service area. We have sized a parallel sewer pipe for
this area such that the total capacity of both pipes
exceeds the design loadings. Conceptual design of the
parallel sanitary sewer facilities has been added to
the Water and Sanitary Sewer Plan enclosed. Please
review this study and advise us whether the parallel
sewer facilities are acceptable as shown so that we may
proceed with the final design.
4. Water Main
Twelve-inch valves have been added to the proposed
water main at 600 feet intervals. Five hydrants have
also been added at 300 foot maximum spacing.
Compliance with other comments regarding required easements,
construction details, brick pavers at Parkway Boulevard , etc.
will be addressed in preparation of the Final Plat and
construction plans. Analysis of the linear park channel will
also be addressed in the design phase.
I trust that the information presented herein satisfys the
concerns of the Development Review Committee and will permit the
Preliminary Plat approval process to proceed.
It is our understanding that this Preliminary Plat will be on the
Planning & Zoning Commission agenda on December 15, 1988.
Ms. Taryon Bowman
JP No. 88009
December 1, 1988
Page 4 of 4
If you need any additional information, please call. Thank you.
Sincerely,/~
erry Parche' , P.E.
JP:ch
Enclosures: Six copies of Heartz Road-Preliminary Plat As Revised
Two copies Water and Sanitary Sewer Plan As Revised
Two copies Drainage Plan As Revised
Two Copies Conceptual Landscape Plan As Revised
Copy of Sanitary Sewer Report & Exhibit Dated
November 17, 1988
Copy of Letter from Ticor Tittle Dated November 8,
1988 w/attachments
cc:
Mr. Jay Chester, P.E./ABQ Development Corporation
Mr. Mike Allen/Parks of Coppell Joint Venture II w/encl.
TICOR TITLE INSURANCE
November 8, 1988
Mr. Jay Chester
ABQ Development Corporation
P.O. Box 25625
625 Silver SW
Suite 200
Albuquerque, NM 87125
Re: Ownership gap/Abandoned Heartz Rd.
Coppell, Texas
Dear Jay:
As a follow-up to our telephone conversation, I have been unable to
locate any "formal abandonment" action pertaining the portion of
Heartz Road north of Sandy Lake Road.
I contacted the City Secretary, Dorothy Timmons, (214/462-0022), who
stated that there is no abandonment ordinance on record regarding this
portion of Heartz Road.
I contacted a Mr. King in the Public Works department of Dallas County.
He could find no record of abandonment by the County. His number is
214/653-7151.
It is possible that this road was established by use with no formal
dedication. Your attorney might want to investigate this matter further.
With respect to the 5 acre tract east of the proposed Heartz Road, I
have enclosed a copy of a deed from a MARK PERKINS to JOAN SOKORA BLAKE,
JACQUIE STUBBLEFIELD, MARY BETH SHIELDS and TIM SOKORA. According to
the City tax records, tax bills are sent to MARY BETH SOKORA SHIELDS,
145 Centennial Dr., Lewisville, Texas, 75067. The Lewisville tele-
phone directory lists J.W. Shields, Jr. at that address, telephone
number 214/43§-5706.
Let me know if I can be of further assistance in these matters.
Branch Manager
encl.
JST/sai
RECE :
NOV 1 I; m.
Ticor Title Insurance Company of California
102 Meadowcreek, Suite 106, Coppell, Texas 75019 (214)462-7420
dP Jerry Parch% Consulting Engineers
November 17, 1988
Mr. Jay Chester, P.E.
ABQ Development Corporation
P O Box 25625
Albuquerque, NM 87125
505/242-3330
RE:
JP No. 88009; Parks of Coppell;
Heartz Road; Sanitary Sewer Study; Coppell, Texas
Dear Jay:
Pursuant to the City of Coppell's review comments for the Heartz
Road preliminary plat, we have prepared a study of the sanitary
sewer in Heartz Road from Sandy Lake Road to Parkway Boulevard.
The purpose of our study was to evaluate sanitary sewer flows in
Heartz Road with fully developed conditions of development in the
service area based on existing land uses in developed areas and
current zoning in undeveloped areas. These discharges were then
compared to capacities in the existing eight-inch sewer line. If
existing capacities are deficient, we determined sewer pipe sizes
necessary to obtain the required capacity to adequately serve the
area upon full development.
Enclosed is a table showing computed design flow and pipe
capacity determined between manholes in the existing sanitary
sewer line in Heartz Road. Also shown is the additional sewer
pipe needed to provide total capacity in excess of the design
flow, where required. It is assumed that a parallel pipe will be
constructed on the same slope as the existing pipe.. Manhole
locations are shown on the. service area exhibit also enclosed.
The design flow at each sanitary sewer manhole (SSMH) on the
existing sewer line north of Sandy Lake Road was established
based upon "Ultimate Development" conditions using Harmon's
Formula for Peak Flow with an additional infiltration factor of
750 gpd/ac. This design method is used by the City of Fort
Worth. The infiltration factor is adopted from methods used by
the City of ?lano.
The results of our study indicate that the two upstream sections
of the existing sewer li~e in proposed Heartz Road between SSMH#6
and SSMH#4 are adequate to serve the upstream service area.
However, the remainder of the existing system, approximately 1930
L.F., from SSMH#4 to Parkway Boulevard, is inadequate and will
require the construction of a parallel line. The size and
lengths of additional pipe required for ultimate development of
the service area are listed in the table. A single pipe
equivalent has also been calculated for each section in case you
6001 W'. Interstate 20, Suite 209, LB 32 · Arlington, Texas 76016 · Metro (817) 572-3458 · (817) 561-2108
day Chester, P.E.
No. 88009
November 17, 1988
Page 2 of 2
elect to remove the inadequate sections and install
sanitary sewer line having the required flow capacity.
a single
We have also investigated whether the existing sanitary sewer in
Heartz Road is sufficiently deep to permit service laterals to
serve your property on the east side of the channel that
parallels Heartz Road without requiring aerial crossings. Using
surveyed channel bottom elevations and sewer pipe flow line
elevations obtained at existing manholes, it appears that the
existing sewer pipe is slightly higher than the adjacent channel
bottom. Therefore, lateral pipes crossing the channel will be
above the existing channel bottom.
We will proceed with an evaluation of the sanitary sewer
extending north across the 27.5 acre tract north of Parkway
Boulevard. This sewer receives flow from the Heartz Road
sanitary sewer and sewers in Parkway Boulevard.
We will submit this evaluation of the Heartz Road Sanitary Sewer
to the City of Coppell following your authorization. If you have
any questions or require any additional information, please do
not hesitate to call.
Sincerely,,-n
JP:ch
Enclosure: Table of Discharges and Pipe Capacity
Service Area Exhibit
HEARTZ ROAD SANITARY SEWER
DISCHARGES AND CAPACITY DETERMINATION
FULLY DEVELOPED SERVICE AREA
EXISTING SANITARY SEWER IS 8" I.D.
EXISTING PROPOSED
DESIGN DESIGN EXISTING PIPE PROPOSED PARALLEL
POINT FLOW PIPE CAPACITY PARALLEL PIPE CAP.
LOCATION* IMGD) SLOPE (MGD) PIPE (MGD)
PROPOSED &
EXIST. PIPES
TOTAL CAPACITY
(MGD)
SINGLE
PIPE
EQUIVALENT
SSMH#6 0.61
1.88% 0.93 NONE N.A. N.A.
SSMH#5 0.82
2.43% 1.06 NONE N.A. N.A.
SSMH#4 1.14
1.52% 0.83 6" PVC 0.53 1.36
SSMH#3 1.41
0.50% 0.48 10" PVC 1.18 1.66
SSMH#2 1.81
0.50% 0.48 12" PVC 1.92 2.40
SSMH#i
Refer to Exhibit Attached
ASSUMPTIONS:
1. Existing pipe has n=0.015.
New pipe will be PVC with n=0.011.
New pipe to be layed at same grade' as existing pipe.
4. Design flows were calculated using Harmon's Formula.
5. Infiltration = 750 gpd/ac.
N.A.
N.A.
8" PVC
12" PVC
12" PVC