ST9401-CS 941208WIER & ASSOCIATES, INE:.
LAND PLANNIN~
December 8, 1994
Mr. Kenneth Griffin, P.E.
City Engineer
Engineering Department
City of Coppell
255 Parkway Boulevard
Post Office Box 478
Coppell, TX 75019
214/462-0022
RE:
W&A #94-093 - PROPOSAL FOR
PROFESSIONAL DESIGN SERVICES -
Denton Tapp Road Project;
Coppell, Texas
Dear Ken:
After meeting with you on November 29, 1994, we have reviewed the subject
alignment (1,400 feet north of Parkway Blvd. to the northern city limits) in the field. We
have also reviewed various as-built and proposed construction plans relating to
existing and future improvements by others near this section of Denton Tapp Road.
We have shown on the enclosed draft 1" = 100' scale plan exhibit the approximate
project limits and general magnitude of improvements we anticipate designing. (We
can refine this draft exhibit into a more presentable CADD format should you desire
such for use in discussions with the Council or others.)
There are several design, construction, logistical and phasing issues we have
identified to date and these are discussed in the enclosed pre-conceptual design memo
entitled "Denton Tap@ road - Major Design Elements and Comments."
We have prepared the enclosed "Pre-conceptual Opinion of Probable
Construction Cost" for the project. This opinion of cost is based on pre-conceptual
sizes of estimated quantities of anticipated improvements and the anticipated unit
prices shown thereon. Improvements generally include demolition, paving, grading,
storm drainage, bridge, landscaping, sidewalks, and 16-inch water main. The total
project cost anticipated at this time is $3,490,078, including a 10% contingency.
Mr. Kenneth Griffin, P.E.
W&A #94-093
December 8, 1994
Page 2 of 2
We have also enclosed a draft of a Contract for Professional Design
Services for the project which defines the scope of design services, design fee, time
for completion of services, etc.
I suggest we meet with you on Monday, December 12, or as soon as convenient
to you, once you have had a chance to preliminarily review the materials submitted
herein. We can clarify any questions you might have and perhaps we can assist you in
determining ways the construction budget for an initial construction project might be
reduced from the total ultimate project cost shown above (i.e. postpone major portions
of the waterline, sidewalks, etc.)
We look forward to working with you and the City on this project.
J PW: ckw
Very truly yours,
JOI-JI.N P. WIER, P.E., R.P.L.S.
sident
Enclosures
Draft Plan Exhibit of Alignment & Improvements Anticipated
Denton Tapp Road - Major Design Elements and Comments Memo
Pre-conceptual Opinion of Probable Construction Cost
Draft Contract for Professional Design Services
WIER & ASSOCIATES, INC.
ENGINEER'S OPINION OF PROBABLE CONSTRUCTION COST
DATE: December 7, 1994 JOB NO.: 94-093
CLIENT: City of Coppell
PROJECT: Denton Tapp Road from Park Entrance North to City Limits Line
(4,720-feet West Lanes; 3,220-feet East Lanes)
ITEM TOTAL UNIT
NO. DESCRIPTION OF ITEM QUANTITY UNIT PRICE COST
I. PAVING
1 R.O.W. Preparation & Clearing 1 LS 60,000.00 60,000
2 Roadway Excavation 25,000 CY 3.50 87,500
3 Roadway Embankment 38,000 CY 1.25 47,500
4 Import Embankment 17,000 CY 7.00 119,000
5 Channel Excavation 3,000 CY 5.00 15,000
6 Revegetate Channel 0.35 AC 4,000.00 1,400
7 Remove Exist. Conc. Pvm't 890 SY 5.00 4,450
8 Remove Exist. Bridge Crossing 1 LS 18,000.00 18,000
9 Remove Exist. Conc. Culvert 1 LS 6,000.00 6,000
10 Lime Stabilized Subgrade 39,000 SY 1.50 58,500
11 Lime @ 34#/S.Y. 663 TON 90.00 59,670
12 6" Reinforced Pavement 254 SY 24.00 6,096
13 7" Reinforced Pavement 230 SY 19.00 4,370
14 8" Reinforced Pavement 36,000 SY 20.00 720,000
15 Temporary Asphalt Transition 900 SY 18.00 16,200
16 Temporary Signage & Barricade 1 LS 12,000.00 12,000
17 Traffic Buttons & Jiggle Bars 1,900 EA 5.00 9,500
18 5' Wide Sidewalk 7,300 LF 12.00 87,600
19 Special Guard Rail @ Bridge 400 LF 70.00 28,000
20 Erosion Control Facilities 1 LS 20,000.00 20,000
21 Manhole Adjustments 4 EA 350.00 1,400
22 Adjust Water Valves 8 EA 200.00 1,600
23 Adjust 30" W.L.M.H. 2 EA 500.00 1,000
24 18" R.C.P. 260 LF 26.00 6,760
25 21" R.C.P. 542 LF 30.00 16,260
26 24" R.C.P. 1,012 LF 38.00 38,456
27 27" R.C.P. 606 LF 41.00 24,846
28 30" R.C.P. 530 LF 46.00 24,380
29 Inlets 13 EA 2,500.00 32,500
30 Remove "Y" Inlet & Const. Junct. 1 EA 2,000.00 2,000
31 3-6'x4' Culvert 1,080 LF 340.00 367,200
32 5-6'x4' Culvert 100 LF 580.00 58,000
33 Culvert Headwalls 90 CY 425.00 38,250
34 2" P.V.C. Conduit for Street Lights 1,240 LF 3.00 3,720
35 Conduit for future Traffic Signals 440 LF 3.00 1,320
36 Pull Boxes 4 EA 400.00 1,600
W&A 94-093
PAGE 1 OF 2
OPIN1294.WK4
37 1W' W.L. Service for Irrigation 5 EA 900.00 4,500
38+ Bridge Crossing Denton Creek 17,640 SF 34.00 599,760
39 Decorative Guard Rail 360 LF 120.00 43,200
40 Rip-rap & Hike & Bike Trail Under Bridge 980 SY 28.00 27,440
41 Hike & Bike Trail Ramp to Connect 260 SY 25.00 6,500
42 Lighting on Bridge 1 LS 4,000.00 4,000
43 - Irrigation & Landscaping Budget 1 LS 270,000.00 270,000
SUBTOTAL I - PAVING $2,955,478
+ Detailed Structural Cost Opinion to establish u nit price.
Detailed Landscape Cost Opinion Prepared tc establish lumr sum price w~ich includes p~vestone.
II. WATER
1 Abandon 8" W.L. North of Parkways 1 LS 1,200.00 1,200
2 16" x 16" W.L. Tap 1 EA 4,000.00 4,000
3 16" W.L. ~3,O50 ! LF 34.00 103,700
4 16" W.L. Connected to Bridge 1801 LF 60.00 10,800
5 12" W,L. 1,400 LF 25.00 35,000
6 8" W.L. 1,450 LF 16.00 23,200
7 16" G .V. 3 EA 1,800.00 5,400
8 12" G.V. 4 EA 900.00 3,600
9 8" G.V. 2 EA 500.00 1,000
10 6" G.V. & F.H. 14 EA 1,800.00! 25,200
11 Fittings 1.5 TON 2,800.00 4,200
SUBTOTAL II - WATER $217,300
TOTAL CONSTRUCTION $3,172,778
10% CONTINGENCY $317,300
TOTAL PROJECT COST $3,490,078
Since the design professional has no control over the cost of
labor, materials, or equipment, or over the contractor's
method of determining prices, or over competitive bidding or
market conditions, his opinions of probable construction cost
provided for herein ara to be made on the basis of his expe-
rience and qualifications. These opinions represent his best
judgment as a design professional familiar with the construc-
tion industry. However, the design professional cannot and
does not guarantee that proposals, bids, or the construction
cost will not vary from opinions of probable cost prepared by
him. If the owner wishes greater assurance as to the construc-
tion cost, he shall employ an independent cost estimator.
Prpd. by
UTL
JPW
Chkd. by
W&A 94-093
PAGE 2 OF 2
OPIN 1294.WK4
DENTON TAPP ROAD MAJOR DESIGN
ELEMENTS AND COMMENTS MEMO
(To Accompany Proposal)
1. Public Utility Location & Coordination:
There appear to be only two unusual public utility situations. There is an
underground multiple GTE duct system along the west side of the roadway.
Conduits are mounted on the west beam of the bridge crossing Denton Creek to
accommodate the GTE lines. The pre-conceptual cost opinion does not include
any costs for construction or design of GTE duct systems. The cost opinion
includes conduit crossings at medians for installation of street lights by TU
Electric, but does not include conduits for other public utilities.
The existing 30-inch water line crosses Denton Creek below grade. We will
need to coordinate with the City of Dallas regarding this line and confirm the line
will not be overloaded by fill embankment. We have not included costs in the
pre-conceptual opinion of probable construction costs for capping the 30-inch
water line. The water line typically has 6' or more of cover and should not be
impacted in street cut locations. The storm drain crossings appear to pass over
the water line and lowering the line is not anticipated. The east bridge crossing
will need to be located to miss the existing water line crossing. The east bridge
may need to be moved more to the west than shown on the pre-conceptual
exhibit. The existing water line may need to be uncovered on both sides of
Denton Creek to make sure the bridge pier locations are a minimum 5' or so from
the existing water line.
2. 404 Jurisdictional Issues:
It appears that the bridge will span the main creek and not impact jurisdictional
area. There will be a culvert crossing upstream that will impact 404 stream, but
this will be far less than one acre and should comply with General Permit 26.
We will need to submit information to the U.S. Army Corps of Engineers Permits
Division to confirm conformance, but we do not anticipate public hearings,
individual permits, or mitigation will be required.
3. Design Surveys:
The design surveys are straight forward and the alignment is open. A maximum
of 4 cross-sections may be needed on the Denton Creek Bridge crossing. A
detailed topographic survey upstream and downstream of Denton Creek will be
Wier & Associates, Inc.
94-039
Page 1 of 5
December 8, 1994
needed to assure proper placement of bridge piers, minimize tree loss and
design of the hike and bike trail crossings on both sides. The properties are
large tracts on both sides and there will not be much right-of-way determination
work on this project. Approximately eleven right-of-way and easement
documents are anticipated.
4. Spur 553 Coordination:
The state has prepared preliminary plans for paving and drainage for the
frontage roads east of Denton Tapp Road. We obtained a copy of portions of
the preliminary design and discussed the project with Kenneth Shirly. There is a
narrow, long drainage area along the west side of Denton Tapp Road north of
the Spur. A total of 111.2 acres of land are collected north of the Spur and
directed to Denton Tapp Road. The state has analyzed the watershed and
determined that a multiple 3-6'x4° culvert will be needed to receive and convey
the runoff to the south to an existing culvert crossing on Denton Tapp Road 650'
south of the Spur. The runoff drains along the east side of Denton Tapp Road
another 400' to an existing drainage ditch on the Vista Ridge property. The
drainage ditch drains to the southeast and empties into Denton Creek
approximately 550' from Denton Tapp Road.
The attached cost opinion assumes the project will be constructed ahead of the
Spur west of Denton Tapp Road and an enclosed multiple culvert will be.,~t,j~,,/
extended south of the Spur approximately 950' to the drainage ditch location.) ¢:~-~.M-
The costs associated with enclosing this drainage will exceed $400,000.--d~_~_,..~')
Alternate methods for conveying the runoff can be explored including a parallel
~concrete channel. Perhaps the drainage can be directed into a linear pond
facility in one of the adjacent developments. We anticipate the esthetic
standards of the city will dictate enclosing the drainage or designing a linear
pond facility. The excavation for a linear pond could be used for fill embankment
and reduce the amount of imported material. Land costs may eliminate the
linear pond option since the adjacent property is planned for commercial use.
5. Sequence of construction:
The street and bridge construction need to be phased to keep a bridge crossing
in place and open to traffic at all times. Due to the existing 30-inch water line
location and other physical restraints, we anticipate the bridge for the west lanes
and the west side of the roadway will be constructed first. The attached pre-
conceptual plan indicates the basic phasing. The sequence is anticipated to be
generally as follows:
a. Relocate public utilities necessary to make fill embankments.
Construct west bridge. (Other work can be ongoing while the bridge is
being constructed.)
Wier & Associates, Inc.
94-039
Page 2 of 5
December 8, 1994
Construct cut and fill embankment for west lanes while west bridge is in
construction.
Install underground public utilities, conduits, storm drainage, culverts and
water lines in west lanes.
Construct west concrete paving lanes, pavement treatment and strip for
two-way traffic.
Transfer traffic to west lanes.
Remove existing bridge and start east bridge and east roadway
construction.
Relocate public utilities necessary to make fill embankment and cap 30-
inch water line if required.
Construct east bridge crossing while other items are in progress.
Construct roadway embankment on west lanes.
Construct public utilities and 16-inch water line.
Pave east lanes and install pavement treatments.
Place irrigation system, landscaping and revegetate median and
parkways.
Place pavement marking on east lanes.
Open west lanes and provide two-way traffic.
The construction plans will need to include detailed construction sequence
plans.
Denton Creek Bridqe Desiqn:
The bridge will probably be built in two different phases requiring different move-
ins by the Contractor. The west side will probably be built first and span the
entire creek bottom section or about 70' to 80'. The deck to Iow cord depth is
estimated to be 5' approximately. The city's criteria requires the bridge Iow cord
be 1' above the improved condition 100-year flood elevation. The roadway
grade will need to be elevated at the bridge and we anticipate the need for
imported borrow due to the embankment. The improved bridge will be above the
floodplain, but wider than the existing bridge. The net result should be that the
improved bridge will probably lower the existing 100-year floodplain upstream of
the bridge. It will be difficult to design a bridge that does not create any rise at
some point upstream for the FEMA and fully developed condition. Designing
Wier & Associates, Inc.
94-039
Page 3 of 5
December 8, 1994
bridge sections and pier locations to prevent a rise will be time consuming and
potentially one of the more difficult design issues with the project.
\Qc'~"r'~The bridge will need to be designed with provisions for public utilities connected
to the beams. The existing bridge is in good condition, but is not aligned where
it could probably be considered for re-construction. The preliminary bridge cost
opinion assumes park paths will be Iocated.,.uRder the bridge on both sides of the
creese deck is assumed to be~C~wide on both sides to provide lane
,.¢r4~sing and a wide pedestrian/hike and bike crossing. If the path is located on
one side only, the bridge costs could be reduced. We anticipate an approximate
160' ramp will be needed to connect the pedestrian hike and bike trail from the
roadway down to the crossing beneath the bridge.
7. Traffic Siqnals:
Conduits are included in the cost opinion at the Spur median opening for future
installation of traffic signals. However, the cost opinion does not include traffic
signal installation.
8. Parks Issues:
We anticipate an entrance and left turn lane will be required for the park east of
the roadway at the existing median opening. The attached preliminary concept
plan indicates a deceleration lane to serve the park complex west of the
roadway. Meetings will be needed with the Parks Department to establish hike
and bike trail and park access designs.
9. Landscapin.q and Streetscapin.q:
The city has detailed design guidelines for design of the medians, parkways, and
paving treatments at crossing locations. The entrance into Coppell at the north
end will be a major entry which has heavy landscaping and a wide pavement
marking band. The cost opinion includes irrigation, landscaping, and pavement
treatments for the center median and parkways. However, landscaping of the
center median north of Highland Drive adjacent to the 3 north bound lanes to be
constructed by the City of Lewisville is not included in the cost opinion. The
bridge crossing will need to include special treatments to enhance its
appearance. The cost opinion includes special treatments and guard rail at the
bridge crossing.
10. 16-Inch Water Line:
The cost opinion includes installation of a 16-inch water line from Parkway
Boulevard to Spur 553, a 12-inch water line from the Spur north for 1,200' and
the remainder an 8-inch water line to the city limits line. The water line will be
Wier & Associates, Inc.
94-039
Page 4 of 5
December 8, 1994
11.
located on the west side of the roadway for most of the length most likely to
avoid conflict with the existing 30-inch City of Dallas water line. The water line
can be deleted from the initial roadway construction project to save money at
that time, but will impact design of the irrigation system if eliminated totally. We
believe the water line should at least be extended north of Denton Creek.
Street LiRhtin.q
We have not included costs for lighting except on bridge.
Wier & Associates, Inc.
94-039
Page 5 of 5
December 8, 1994