SS9901-CS000512 (2)· Turner Collie Bmden lnc
Engineers · Planners · Project Managers
May 12, 2000
Mr. Kenneth M. Griffin, P.E.
Director of Engineering & Public Works
City of Coppell
255 Parkway Boulevard
P.O. Box 478
Irving, Texas 75019-4409
17300 Dallas Parkway
Suite 1010
Dallas, Texas 75248
972 735-3000
Fax 972 735-3001
Re:
Scope of Services for Preliminary Design
DeForest Wastewater Lift Station Force Main Improvements
Dear Mr. Griffin:
Two copies of the Scope of Services and associated Engineering Fees for the referenced
project are enclosed for your review and approval. The proposed Scope of Services is
described in Exhibit A attached. The proposed fees for these services is $56,426.
Please let me know if you need more information concerning this project. We look
forward to working with you and the City of Coppell staffon this assignment. Thank you
for selecting Turner Collie & Braden Inc. to assist you with these proposed
improvements.
Sincerely,
/Robe c. R h, P.E.
Vice President
Engineering Excellence for Over One-Half Century
EXHIBIT A
SCOPE OF SERVICES
COPPELL, TEXAS
DEFOREST WASTEWATER LIFT STATION
AND FORCE MAIN IMPROVEMENTS
0.0
1.0
GENERAL
0.1
Project Description
The services to be provided for this project include preparation of a preliminary
design report for the improvements to be made to the DeForest Wastewatar Lift
Station and force main facilities. The services include:
· Evaluation of the capacity of the existing pumping facilities to meet
pumping requirements in the year 2020 at the wastewater lift station.
· Evaluation of the force main required to transfer wastewater from the
DeForest Lift Station to the Sandy Lake Lift Station.
· Evaluate alternative routes for the force main in Samuel Street and
MacArthur Boulevard.
· Determine the odor control facilities to be provided at the lift station to
control odors.
0.2
Project Phasing
This project shall be performed in one phase. The Preliminary Design Report
phase includes data collection, evaluation of the existing facilities and
recommended improvements, and development of preliminary improvement
recommendauons for the C~ty review and approval.
0.3
Design Standards
Design and preparation of construction drawings and technical specifications
required for the project shall be in accordance with the following standards.
a. North Central Texas Council of Governments (NCTCOG)
b. City of Coppell Design Standards.
c. City of Coppell Standard Drawings and Specifications.
d. Texas Natural Resources Conservation Commission (TNRCC)
Preliminary Design Report
1.1
Data Collection
Obtain available reports, plans, pumping records, flow records, zoning maps,
aerial photographs, master plans, and other data relevant to the project from the
City.
1.2
1.3
1.4
1.5
Design Me~ting
Meet with the City of Coppell staff to review and discuSs the preliminary design
criteria, operational concerns, and other preliminary data. The Engineer shall
prepare a record of the preliminary design meeting and distribute it to all
attende~s.
Evaluation of Existing Facilities
Evaluate the existing lift station facilities, force main, and gravity sewers affected
by the proposed improvements.
Ultimate Development of Drainage Basin
Determine the projected ultimate build-out date for the sanitary sewer drainage
basins A & F. The estimated date will be based on historical growth trends
provided by the City of Coppell
Determination of Required Pumping Capacity of the Lift Station
Determine the required pumping capacity of the DeForest Lift Station for the
ultimate build-out date of the drainage basin (Basins A & F in the 1994 Master
Plan) served by the lift station. The following tasks will be performed to
determine the required pumping capacity of the lift station:
a. prepare an estimate of current wastewater flow based on existing land
use. This will include counting connections to the existing wastewater
collection system using existing block/lot development maps, zoning
maps and land use master plan provided by the City. Two field visits are
anticipated to verify land use.
b. Compare estimated flow rates with pumping records provided by the
City. Adjust the estimated flow rates as required to correlate with the
pumping records.
c. Review peak wet weather flows based on available past rainfall data and
wastewater flows. Estimate peaking factors based on rainfall data and
lift station pumping records provided by the City.
d. Using the peaking factors established above, estimate flows based on the
projected full development of Basins A & F.
e. Compare year 2020 and ultimate peak flow and pumping requirements
with the 1994 Master Plan projections and TNRCC existing and
proposed regulations.
f. Prepare a Task Report and review findings with thc City.
1.6
1.7
1.8
Force Main Alternatives
Determine the size of the force main required to transfer wastewater from the lift
station to the Sandy Lake Lift Station. Evaluate alternative routes for the force
mains in Samuel Street and MacArthur Boulevard.
Lift St~ionModifications
Develop pump/system head curves for the existing force main and lift station and
proposed improvements to the lift station and the alternative routes of the
proposed force main. Evaluate the following five alternatives for upgrading the
lift station and force main facilities.
Convert the existing DeForest Lift Station to a station using only
submersible pumps.
New force main in Samuel Street and new submersible pumps at the
DeForest Lift Station.
New force main in MacArthur Boulevard to the existing gravity sewer to
the Sandy Lake Lift Station.
New force main in MacA_rthur Boulevard to the existing Sandy Lake Lift
Station wet well using new submersible pumps at the DeForest Lift
Station.
New force main in MacArthur Boulevard to the existing force main out
of the existing Sandy Lake Lift Station using new submersible pumps at
the DeForest Lift Station.
Lift Station Electrical Schematics
Prepare preliminary electrical requirement schematics for the proposed
improvements to the DeForest Lift Station.
1.9 Odor Control
Review the odor control technologies available for use at the lift station and
recommend facilities to control odors at the DeForest Lift Station.
1.10 Cost Estimates
IAI
Develop capital and operating cost estimates for each of the proposed
alternatives.
Draft Report
Prepare a preliminary report of findings and recommendations and submit five
copies to the City for review and approval.
2.0
1.12 Review Meeting
Meet with City staff to review the preliminary report and address City comments
and concerns.
1.13 Final Report
Modify report to include final comn'~nts provided by the City
1.14 Submittal
prepare Final report and submit 10 copies to the City.
Schedule
The draft report will be completed and submitted to the City within three months of
receipt of the Notice to Proceed from the City. The final report will be submitted with
one month after receipt of comments from the City.
The following tasks are not included in the Contract:
· Flow monitoring
Rain event monitoring
· Geotechnicai investigations
· Field Surveying
EXHIBIT B
City of Coppell, Texas 05/12J00
DeF-orest Wastewster Lift Station and Force Main Improvements
PRELIMINARY ENGINEERING
BASIC SERVICES
Project Project Staff Senior
TASK LISTING Manager Engineer Engineer Technician Technician Clerical TOTAL
t .0 Preliminary Oesign Report
1.1 Data Collection 4 8 2 $1.100
1.2 Design Meeting 4 8 2 $1,480
1.3 EvaJuabon of Ex[sting Facilities 4 8 4 $1,700
1.4 Ultimate Development ot Basin 4 8 16 8 $3,080
1.5 Required Pumping Capacity of Station
a. Land Use Analysis 40 24 S6,000
b. Pumping records analysis 4 4 $980
c. Peaking f actor dete rminaticn 4 8 $1.400
d. Estimate flows 4
e. Evaluate results 4 S420
t. Task report 4 20 2 $2,740
1.6 Force Main AJtematives 20 20 $3,600
1.7 Lift Stabon Modifications
a. Alternative 'A' 2 8 16 16 S3.280
b. AJtematJve 'B' 1 2 8 $950
c. AJtematrve 'C' 1 2 8 $950
d. Alternative 'O' I 2 8 $950
e. AJtematJve 'E' 1 4 16 $1,760
1.8 Lift Station Electrical Schematics 16 20 20 $5.840
1.9 Odor Control 8 8 16 S3,160
1.10 Cost Estimates 8 8 24 $3.760
1.11 Draft Report 8 16 40 8 S6.120
1.12 Review Meeting 4 8 $1.400
1.13 F~nal Report 4 8 20 $2,900
1.14 Submittal 4 8 4 $1.320
TOTAL HOURS 82 I 214 256 24 18 594
LABOR EXPENSE TOTALS Sl1.480 ] S22.470 S19.200 Sl.440 S720 S55.310
TC&B NON-LABOR ESTIMATE
Plotting 10 sheets x 2 subm;ttaJs xS7/sheet $140
Rel3roduction {Plans} 10 sheets x 20 sets x $0.70/sheet $140
Reproduction (Reports) 50 sheets x 20 sets x $0.101sheet $100
Delivenes $150
_Postage $50
Mileage 10 tdos Q $15,1rip $150
Compoter Use 24 houm CADO Q S10/1~r $240
~,dmimstraflve 15 00%1 S146
'NON-LABOR TOTAL ]1 II S1,116
SUBCONTRACTOR SERVICES AND Al)MINISTRATION
· ubcontractor ask &Exp. 15.00% Contracts Il_ Expense_
TOTALS
ITOTAL ESTIMATE I ! S56.426 I