ST9304-CS 950123HALFF ASSOC,ATES, INC.
ENGINEERS * SCIENTISTS · SURVEYORS
DALL,¢, - FORT WORTH · ARLINGTON * CHICAGO
8616 NORTHWEST PLAZA DRIVE · DALLAS. TEXAS 75225
214/739.0094 · FAX 214/739.4)095
January 23, 1995
AVO 14111
Dallas County Public W~rks
411 Elm Street
Dallas, Texas 75202
Art:
Ms. Jill M. Sclmeberger, P.E.
Project Engineer
Re: Beltline Road, from Denton Tap Road
in Coppell to MacArthur Boulevard
Project 490-403.1/91-829
Dear Ms. Schneberger:.
li C.R IVt;
JAN 2 4 1995
Enclosed please f'md three revised copies of our Geometric Alignment Study for the
referenced project. We have made the revisions requested in your letter of December 16, 1994.
I have also enclosed the original marked set of plans as requested.
Per our telephone conversation of January 11, 1995, sidewalks will not be added to the
Grapevine Creek bridge. Additionally, 3:1 cut~ll slopes arc to be used everywhere except within
the City of Coppell where 4:1 slopes will be used. Top and toe of dopes falling within the right-
of-way am not shown for clarity at the 1"=100' scale.
We offer the following responses regarding commentS in your letter and on the Plans:
Entrances to the Riverside Church of Christ have been added along Belt Line Rd
as well as Northlake Drive;
,
Currently, the entire proposed alignment is contained within the existing fight-of-
way with the exception of the free right turn lane at the southwest ~ of
MaleArthur Blvd and Belt Line Rd. The existing right-of-way has a m~nimum
width of 120 feet. It was necessary to widen the right-of-way 5 feet in the area
of the aforementioned free fight turn lane in order to maintain a 10--foot wide
parkway. Sufficient right-of-way exists at Moore Road and Mockingbird Lane to
add the free right turn lanes without obtaining additional right-of-way. However,
an easement will be required from DART at each location as well as at the
northeast comer of MacArthur BIrd and Belt Line Rd.
TRANSPORTATION , WATER RESOURCES · LAND DEVELOPMENT · MUNICIPAL · ENVIRONMENTAL · STRUCTURAL
SURVEYING · GLOBAL POSITIONING SYSTEM (G.P S-) · REMOTE SENSING AND MAPPING
LANDSCAPE ARCHITECTURE · PLANNING -
HALFF ASSOCIATES, INC.
ENGINEERS · SCIENTISTS ·
SURVEYORS
Page 2
Dallas County Public Works
January 23, 1995
Preliminary contact has been made TU Electric regarding the railroad spur
crossing. According to F-l!zabeth Kaxahan, with TUE, the spur track is not
currently in use however, there are no plans for removal or abandonment As
such, we have accounted for the spur tack in the preliminary profile however, we
have not pursued additional detailing of the crossing. Ftmher discussions with TU
Electric will be required during preliminary design. Dallas County and the City
of Coppell will be invited to these discussions.
As requesl~l, a 60-foot wide median opening has been added at approximate Sta
116+03 to align with the proposed Valley Ranch Plaza development to the south.
Please be aware that the nose-to-nose distance to the MacArthur Blvd median
opening is 355 feel This is 65 feet less than City of Coppell standards for
median opening spacing. Therefore, we recommend a westbound left turn lane
be. placed at this location,
Sheet 3 of the plans contains a note questioning the proposed grades Cast of the
TU Electric spur. track. The grades have been set as low as possible given the
constraints on Stopping Sight Distances (i.e. K-values) for it 50 MPH design speed
and the current elevation of the spur track
Sheet 3 also contains a note regarding the .ownership of the land between the
existing pavement and the DART right-of-way. According to our research, this
property is owned by Dallas County as pan of the existing Belt line Road right-of-
way. The right-of-way width varies between Sta 44+00 and approximate Sta
105+00. Minimum width is 120 feel
HALFF ASSOCIATES, INC.
ENGINEERS · SCIENTISTS *
SURVEYORS
Page 3
Dallas County Public Works
January 23, 1995
Sheet 4 contains two notes regarding drainage. Drainage beneath the TU Elecu'ic
entrance will be handled with a culvert. Overland drainage flow is directed
towards Belt Line Road at Sta 68+00. Halff Associates has reviewed the location
of the proposed drainage easements. The drainage easements have been revised
and expanded to accommodate interceptor sWales along the larger u'acts of land
draining to the right-of-way. Please reference the preliminary Drainage Area map
submitted on November 28, 1994 for drainage area delineation.
Please call if you have any ~estions or require additional information.
Patrick L. Kunz, P.E.
Enclosm