ST9301A-CS 940310 PRELIMINARY
DESIGN REPORT
FOR
SANDY LAKE ROAD
FROM MacARTHUR BLVD
TO cOPPELL EAST CITY LIMITS
COUNTY OF DALLAS, TEXAS
DEPARTMENT OF PUBLIC WORKS
PROJECT 91-830
ROAD AND BRIDGE DISTRICT NO. 1
PREPARED BY
SVERDRUP CIVIL, INC.
March 10, 1994
INTRODUCTION
Sandy Lake Road will be improved from two lanes of asphalt to four lanes of concrete
pavement in a 110 foot right-of-way. The inner four lanes of the ultimate six lane
roadway are being built first to provide a wide parkway, or buffer zone, to adjacent
property as requested by the City of Coppell. The construction limits are from
approximately 620 feet west of MacArthur Blvd. to the existing Trinity River bridge, a
distance of 5570' - including asphalt transitions.
ALIGNMENT
In the area of MacArthur Boulevard, the alignment is parallel ahd adjacent to the north
side of the 80 foot drainage easement along' existing Sandy Lake Road. Then an 850
foot radius curve encroaches on the smaller radius curve of the drainage easement
requiring a small retaining wall near a drainage structure. The proposed roadway then
runs parallel to the drainage easement again with the southerly right-of-way line
overlapping the drainage easement by. 15 feet. The proposed roadway continues on
tangent to a 1000 foot radius curve just beyond Riverchase Drive, and then proceeds
centered in the existing right-of-way to the Trinity River.
The proposed vertical alignment has been set to provide 2 feet of freeboard above the
100-year flood elevation of 446.0 feet near Kimbel Kourt and 445.3 feet from Riverchase
Drive east. As a result the majority of the project is in fill (3-5 feet), and will require
slope easements beyond the 110 foot right-of-way to place fill required for the future
outside lanes. Also immediately northeast of the culvert under Sandy Lake Road, the
bank of Denton Creek has eroded into the proposed right-of-way and will require
stabilization with concrete riprap.
RIGHT-OF.WAY
The right-of-way is generally 110 feet wide on tangent sections. At the two curves it
widens to the outside as the radius of the existing right-of-way is smaller than the
proposed right-of-way. A large take is made on the inside of the curve and none is
taken on the outside resulting in a right-of-way of more than 110 feet for a short
distance. Preliminary right-of-way plans have been prepared by Arredono, Brunz &
Associates, Inc. showing 28 affected parcels.
COORDINATION
This section of Sandy Lake Road is one of several currently undergoing design
improvements. HoweVer, transitions will be designed to match existing conditions, since
it is unknown in what order the' sections will be built. Sverdrup has met with the
engineer of the section immediately to the west and coordination is underway. However,
they are in the very early stages of design, so final grades may vary from those shown on
the preliminary plans. To the east, this section of Sandy Lake Road matches a proposed
bridge over the Elm Fork of the Trinity River. Currently an extensive hydraulic study
is underway that will be used to determine the required bridge elevation. In order to
complete preliminary plans, Sverdrup has assumed an elevation of the bridge based on
preliminary information received from the bridge engineer. It should be noted that
grades and elevations of the east end of the project may vary.
The lane configuration of the bridge differs from both the proposed 4-lane and the
future 6-lane section of Sandy Lake Road. The proposed lane configuration of the
bridge is a 22- foOt median with two 24-foot striped travel lanes. The proposed lane
configuration of Sandy Lake Road is a 17 foot median (face to face of curb) and two 24-
foot travel lanes. The 5 foot wider median on the proposed bridge requires the Sandy
Lake Road travel lanes to shift outward 2.5 feet. The future lane configuration pf the
bridge is a 4 foot median with two 33 foot travel lanes, but the future configuration of
Sandy Lake Road is a 17 foot median (face to face of curb) with two 36 foot travel
lanes. The difference forces the Sandy Lake Road lanes to shift inward and to narrow.
For coordination purposes, transitions for both the proposed and the future conditions
have been included in the preliminary plans. Also field survey data has been furnished
to the bridge engineer.
As further coordination, Sverdrup requests that the City of Coppell mark any condUit
location, type and size on the plans that they require for lighting, irrigation or other
purposes.
UTILITIES
Utility companies have been contacted and verifiable utilities have been shown the plans.
Following is a list of utility companies that will receive preliminary plans for verification
of accuracy and completeness of utilities shown.
Contact Utili .ty Company
Howard Pafford City of Coppell water department
Maybeth Whaley GTE
Willie Watson Lone Star Gas
Glen Fabian, : ....... TUE.
Dan Saldana Dallas Water Utilities '
- - Cable TV
(water department) City of Irving
- AT& T
2
Potential utility conflicts include adjustment or relocation of GTE manholes and conduit,
adjustment of sanitary sewer manholes, and relocation of overhead wires, adjustment of
water valves, and relocation of water meters and fire hydrants. A new 60" water line is
proposed along the north side of Sandy Lake Road, but no conflicts are anticipated. We
understand that the City of Coppell may want to increase the size of a sanitary sewer
line along the west end of Sandy Lake Road, and that Dallas Water Utilities may want
to increase the size of a 30" water line serving the City of Flower Mound, also along the
western portion of Sandy Lake Road. Timing of these water and sewer improvements
is not known.
DRAINAGE
Generally only minor drainage enters Sandy Lake Road due to the height of the fill
required to bring the top of curb to 2 feet above the 100 year flood elevation. A
drainage area map has been prepared showing areas entering the road and areas
draining to the roadway embankment. It will be necessary to locate some inlets on
private property, as this property currently drains to a ditch along the existing roadway,
and the proposed roadway is higher than the private property. All storm sewers will be
designed per City of Dallas criteria. Generally inlets along the drainage channel will
outfall directly into the channel to reduce the length of drainage pipe required. East of
the drainage channel storm sewers will be located to minimize utility relocations, and
where possible located under the future outside lane. Areas east of RiverChase Drive
will outfall at the proposed bridge and areas west of Riverchase Drive will outfall at the
four 8-foot x 10-foot box culverts under Sandy Lake Road. These box culverts will need
to be extended approximately 40 feet down stream and 16 feet upstream due to the
widened roadway. The extension will probably have to be done at times of low flow in
the Elm Fork of the Trinity River to avoid standing water in the culverts and channel.
COST ESTIMATE
A preliminary cost estimate for the construction is included below. Quantities are based
on the preliminary plans, and pay items are taken from the Dallas County bid item list
dated March 1988,
PRELIMINARY CONSTRUCTION COST ESTIMATE
SANDY LAKE ROAD - MACARTHUR BLVD TO COPPELL CITY LIMIT
DALLAS COUNTY PROJECT NO. 91-830
Item Description Unit Quantity Price ' Total
100 PREPARE ROW STA 49 1000 49,000
104 REMOVE OLD CONCRETE SY 3,200 5.25 16,800
1~ SAWED BREAKOUT GROOVE LF 650 2.00 1,300
........ ~t0 UNCL RD EXCAV DENS CONT CY 8,000 4.00 32,000
132 EMBANKMENT DENSITY CONT CY 104,200 5.00 521,000
260 LIME SLURRY TY A OR B TON 497 80.00 39,760
260 LIME TREAT SUBGR DENS CONT SY 36,804 1.50 55,206
340 HMAC TY-A TON 940 50.00 47,000
340 HMAC TY-D TON 313 50.00 15,650
360 CONC PAV REINF (8") SY 32,223 23.00 741,129
360 6" MONO CURB LF 19,940 1.00 19,940
400 UNCL STR EXCAV CULVERT CY 410 7.50 3,075
421 CL A CONC HDWALL & WINGWALL CY 260 350.00 91,000
421 CL A CONC RET WA~L CY 50 350.00 17,500
430 CL A CONC STR CuI~VERT CY 210 350.00 73,500
432 CL B CONC RIPRAP CY 150 240.00 36,000
440 REINFORCING STEEL LB 64,285 0.50 32,143
465 PIPE SEWERS CL III 18" LF 750 35.00 26,250
465 PIPE SEWERS CL III 21' LF 1,600 35.00 56,000
465 PIPE SEWERS CL III 24' LF 700 50.00 35,000
465 PIPE SEWERS CL III 27" LF 400 50.00 20,000
465 PIPE SEWERS CL III 36" LF 800 65.00 52,000
465 PIPE SEWERS CL III 42' LF 450 100.00 45,000
470 MH COMPL 5' DIA EA 6 2600.00 15,600
470 INLET COMPL REC 10' EA 38 1800.00 68,400
496 REMV OLD STRUCTURE PIPE LT/E 18" LF 850 6.00 5,100
508 CONSTRUCT DETOURS STA 50 2500.00 125,000
530 CONC DRIVEWAYS 6' SY 1,370 22.00 30,140
~..~:.~..i:~5. METAL BEAM GUARD FENCE LF 1,100 16.00 17,600
540 TERMINAL ANCH SEC EA 2 300.00 ~" 600 .....
542 REMV METAL BEAM GUARD FENCE LF 400 5.00 2,000
550 CHAIN LINE BAR FENCE 6'HT LF 200 15.00 3,000
550 VEHICULAR GATE EA 1 500.00 500
4010 TRENCH SUPPORT SYSTEM LF 4,400 3.50 15,400
TOTAL ESTIMATED COST $2,260,593
File: ESTIMATE.'~k 1