PA1301-CS141013 * tnp
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teague nail&parkins www.tnpinc.com
engineers
surveyors
Memorandum landscape architects
To: John Elias—City of Coppell, Dept. of Parks and Recreation
From: Scott Wilhelm and Niraj Acharya —Teague Nall and Perkins
cc: CPL 12149 File
Date: October 13, 2014
RE: 100% Design Review Plans
Erosion Control Improvements for Andrew Brown Park — Phase 2 & Denton Creek
Pedestrian Bridge
TNP has completed the 100% design documents for the referenced project. This memo serves to
document the design assumptions and identify some elements of the design that may need
additional input and direction from the City. Included with this memo are the following items:
1. Three sets of full size 100% plans for City review and comment.
2. Three copies of the specification book containing the bid proposal and description of pay
items.
3. Updated cost opinions for the Andy Brown Park erosion control improvements and the
Denton Creek pedestrian bridge.
For clarity within the plans, we have identified the proposed erosion improvements for the lake as
Unit I and the proposed pedestrian bridge and associated trail improvements as Unit II. Similarly,
the bid proposal is also divided into Unit I and Unit II bid items.
The attached plans and specifications should address the comments provided by the City to the
60% review plans. In addition, there are still a few items that we need to clarify and include
before the project is bid.
1. There was discussion at the 60% review meeting regarding a title for the project that did
not get confused with the phases associated with the park master plan. If the City has a
preference for a project title we will gladly revise the plan sheets accordingly.
2. We need to insert a detail for the proposed split rail fence that is to replace the existing
bollard/cable system. If the City has a detail for its typical split rail fence, please provide
it to us.
3. The plans currently indicate the use of Flex-a-mat erosion matting in the southwest corner of
the lake where wall has been omitted to allow access to the lake. Flex-a-mat is a geogrid
material with 6"x6"x6" concrete clumps at roughly 12" on center. This product works well
to prevent erosion and allow vegetative growth, but it does not always provide a smooth
surface for walking or mowing. If the City wants easy access to the lake at this location
along with a surface that is easy to mow, it may be worthwhile to consider some other type
of turf reinforcement mat at this location.
4. We have included a $5,000 line item for repairs at the existing Overlook. In addition, the
Description of Pay Items further defines the intent of the line item. Please review the
description and provide any comments or direction regarding the types of repairs
anticipated as well as the intended approach for negotiating with the contractor.
5. We are proposing an 18" catch basin in the northwest corner of the lake to address
drainage from the adjacent properties and to account for the raising of the trail in this
location for access to the proposed pedestrian bridge.
Fort Worth 1 100 Macon Street Fort Worth,Texas 76102 A 817.336.5773 ^ Dallas 17304 Preston Road,Suite 1340 A Dallas,Texas 75252,•214.461.9867
Denton,.1517 Centre Place Drive,Suite 320 A Denton,Texas 76205.A 940.383.4177 ^ Sherman 200 North Travis Street,Suite 500..Sherman,Texas 75090 903.870.1089
Registered by the Texas Board of Professional Engineers,No.F-230 A Registered by the Texas Board of Professional Surveyors,No.100116-00
6. The current plans for the lake erosion control improvements do not represent the use of
structural backfill that was used for potions of the Phase 1 project. We believe that the
configuration of the proposed wall and the location of the existing facilities (e.g. trail, etc.)
will allow the proposed walls to be constructed with select backfill as opposed to using
structural backfill (i.e. no fines concrete). The use of select fill as opposed to structural
backfill should represent a cost savings to the project.
7. Please provide the City's project number for use on the plans and specifications.
Please distribute and review the attached information. Upon completion of your review we would
like to meet to discuss any comments/questions and determine dates for advertising and bidding
the project.
Thank you for the opportunity to serve the City of Coppell. Please do not hesitate to contact us
with any questions or if you need additional information.
Scott Wilhelm, P.E.
Principal
817-665-7146
swilhelm@tnpinc.com
Niraj Acharya
Project Manager
817-665-8202
nacharya@tnpinc.com
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Opinion of Probable Construction Cost
Client: City of Coppell Date: 10/13/2014
Project: Unit I-Andy Brown Park Ph.2-Erosion Control Improvements Prepared By: SCW
tnp no.: CPL12149 Checked By: NAA
100% Design Sheet 1 of 2
Spec
No. Item Item Description Quantity Unit Unit Cost Item Cost
1 Mobilization 1 LS $30,000.00_ $ 30,000_
2 Furnish and Install Project Sign 1 EA $500.00 $ 500
3 Dewatering/Pumping to lower lake level 1 LS $50,000.00 $ 50,000
4 General Site Preparation 1 LS $60,000.00 $ 60,000
5 Concrete Segmental Retaining Wall 18,250 SF $40.00 $ 730,000
6 Embankment&Grading 5,000 CY $15.00 $ 75,000
7 5"Reinforced Concrete Trail(10'wide) 3,630 SF $5.50 $ 19,965
8 18"Thick Rock Rip-Rap 120 CY $100.00 $ 12,000
9 Slope Protection 150 SY $45.00 $ 6,750
10 5"Thick Concrete Rip-Rap 75 SY $85.00 $ 6,375
11 30"RCP(Class III) 69 LF $125.00 $ 8,625
12 10'Curb Inlet 1 EA $2,500.00 $ 2,500
13 2-10'x5'Reinforced Concrete Box Culvert 52 LF $1,000.00 $ 51,500
14 10'x5'Headwall 1 EA $10,000.00 $ 10,000
15 Safety Rail for Wall 1,252 LF $40.00 $ 50,080
16 Walls for Overlook Point 1 LS $53,500.00 $ 53,500
17 Flatwork for Overlook Point 1,240 SF $6.00 $ 7,440
18 Pilasters for Overlook Point 4 EA $3,100.00 $ 12,400
19 Pavers for Overlook Point 205 SF $15.00 $ 3,075
20 Handrail for Overlook Point 160 LF $50.00 $ 8,000
21 Split Rail Fence 1,295 LF $20.00 $ 25,900
22 Repairs for Existing Overlook Structure 1 LS $5,000.00 $ 5,000
23 Restore Disturbed Areas 11,400 SY $5.00 $ 57,000
24 Erosion Control and SWPPP 1 LS $10,500.00 $ 10,500
Construction Subtotal $ 1,296,110
Contingencies(0%) $ -
Unit I Total $ 1,296,110
❑ No Design Completed
❑ Preliminary Design
Q Final Design
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Opinion of Probable Construction Cost
Client: City of Coppell Date: 10/13/2014
Project: Unit II-Denton Creek Pedestrian Bridge Prepared By: SCW
tnp no.: CPL12149 Checked By: NAA
100% Design Sheet: 2 of 2
Spec
No. Item Item Description Quantity Unit Unit Cost Item Cost
1 Mobilization 1 LS $30,000.00 $ 30,000
2 Site Preparation 1 LS $75,000.00 $ 75,000
3 Embankment and Grading 1 LS $10,000.00 $ 10,000
4 Concrete Segmental Retaining Wall 1,000 SF $40.00 $ 40,000
5 Catch Basin 1 EA $1,500.00 $ 1,500
6 12"HDPE Pipe 40 LF $25.00 $ 1,000
7 5"Thick Concrete Rip-Rap 330 SY $85.00 $ 28,050
8 Drilled Concrete Piers 196 LF $175.00 $ 34,300
9 Concrete Abutment 29 CY $400.00 $ 11,600
10 Reinforced Concrete Bridge Deck 2,265 SF $15.00 $ 33,975
11 Concrete Surface Treatment 2,265 SF $3.00 $ 6,795
12 Structural Steel Bridge(Main Truss Span,240') 1 LS $320,000.00 $ 320,000
13 Main Truss Assembly and Erection 1 LS $32,000.00 $ 32,000
14 5"Reinforced Concrete Trail(10'wide) 3,630 SF $5.50 $ 19,965
15 Safety Rail for Wall 455 LF $40.00 $ 18,200
16 Pilasters for Bridge 4 EA $2,000.00 $ 8,000
17 Restore Disturbed Areas 1,000 SY $5.00 $ 5,000
18 Erosion Control and SWPPP 1 LS $5,000.00 $ 5,000
Construction Subtotal $ 680,385
Contingencies(0%) $ -
Unit II Total $ 680,385
❑ No Design Completed
❑ Preliminary Design
0 Final Design