R2002-0010 01-14-02 RESOLUTION NO. R2002-10
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF PEARLAND,
TEXAS, APPROVING WORK AUTHORIZATIONS NUMBERS TWO AND
THREE FOR ENGINEERING SERVICES ASSOCIATED WITH THE
PEARLAND MOBILITY AND DRAINAGE BOND PROGRAM.
BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF PEARLAND, TEXAS:
Section 1. That certain contract by and between the City of Pearland and Turner,
Collie and Braden, Inc., ("T C & B) for Program Management of the Pearland Mobility and
Drainage Bond Program was authorized by the City Council on December 10, 2001.
Section 2. That T C & B has developed work authorizations numbers two and
three, which are attached hereto as Exhibits "A" and "B" respectively.
Section 3. That work authorizations numbers two and three for engineering
services associated with the Pearland Mobility and Drainage Bond Program are hereby
approved.
PASSED, APPROVED and ADOPTED this the__ ,
A.D., 2002.
ATTEST:
EORETARY' u-
APPROVED AS TO FORM:
DARRIN M. COKER
CITY ATTORNEY
14 day of January
TOM REID
MAYOR
ATTACHMENT D
WORK AUTHORIZATION NO. 3
Exhibit "A"
R2002-'10
This Work Authorization is made pursuant to the terms and conditions of the Pearland
Mobility & Drainage Bond Program, hereinafter identified as the "Contract", entered into
by and between thc City of Pearland ("City"), and Turner Collie & Braden Inc.
("Engineer).
PART 1. Work Authorization No. 3 is related to West Mary's Creek Detention Facility.
The Engineer will perform Hydrologic and Hydraulic Studies under this Authorization.
PART 2. The maximum amount payable for services under this Work Authorization is
$27,120.00. This amount is based on the following: See attached fee proposals submitted
by Dannenbaum Engineering Corporation for H & H Study dated December 26, 2001.
PART 3. Payment to the Engineer for the services established under this Work
Authorization shall be "Lump Sum".
PART 4. This Work Authorization shall become effective on January 14, 2002 and shall
terminate on November 12, 2005, unless extended by a supplemental work authorization.
PART 5. This Work Authorization does not waive the parties' responsibilities and
obligations provided under the contract.
PART 6. This Work AuthOrization is hereby accepted and acknowledged below.
By:
ENG~)IE~R
TylSed or Printed Name
OF PEARLAND
By~
Typed or Printed Name
Title
itle
Date
Date
LIST OF EXHIBITS
Exhibit A - Fee Schedule
Exhibit B - Work Schedule
Turne~r Collie Braden Inc. 12/28/2001
EXHIBIT A
FEE SCHEDULE
Pearland Mobility & Drainage Bond Program
Work Authorization No. 3
Summary
Pro_iect
West Mary's Creek Detention Facility
En_oineerino_ Services
Hydrologic & Hydraulic
Environmental Compliance
Topographic Survey
Geotech
ROW Maps & Documents
PS&E
ROW Acquisition Assistance
Materials Testing
Subtotal
Dannenbaun Engineering
Previous
Authorization
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
0.00
Current
Authorization
$ 27,120.00
$ 27,120.00
Page 1 of I
DANNENBAUM ENGINEERING CORPORATION
31C(] WEST ALABAMA HOUSTON, TEXAS 77098 P.O. BOX 22292 HOUSTON, TEXAS 77227 (713) 520-957Q
December 26, 2001
Mr. lames W. Keller, P.E.
P.O. Box 130089
Houston, Texas 77219-0089
RE: Mary's Creek Off-Line Detention Facility (Dry Bottom)
Dear Mr. Keller:
Dannenbaum Engineering Corporation (DEC) has prepared an engineering fee estimate
for completing an analysis for a proposed detention facility (dry bottom) along Mary's
Creek. The proposed site (160 acres) is located on the northern bank of Mary's Creek,
between FM 1128 and Harkey Road. The use of stormwater pumps will be investigated
in order to maximize the amount of available storage in the proposed detention pond.
The hydrologic and hydraulic results of the analysis, as well as cost estimates the
proposed pond will be submitted. This letter will present our engineering fee estimate and
will summarize the necessary steps in the analysis.
1. Data Collection
The first step towards completing the analysis is to collect the data necessary to
properly evaluate potential detention pond alternatives. DEC recommends that
repetitive loss information be collected so that the areas of most severe flooding
downstream of the detention pond site may be identified. In addition, highwater
marks from Tropical Stom~ Allison will be collected from the City of Pearland
and Brazoria Drainage District #4. In order to evaluate flood stages using the
current HEC-2 model, additional channel and bridge cross sections will be needed
in the reach along the potential detention site. DEC understands that the Survey
cost will be contracted separately to on-call surveyors.
2. Calibrated Existing Conditions
Calibrated existing conditions hydrologic and hydraulic models need to be
developed for the detention analysis. In order to complete this task, an additional
routing node needs to be added to the existing hydrologic models at the location
of the proposed detention pond's outfall structure. Subbasin boundaries and Clark
unit hydrograph parameters will be modified to accommodate this routing node
addition. Calibrated HEC-1 models for the 5-, 10- and 100-year flood events will
be developed. The 5-year event is being analyzed since it is likely that flooding
occurs along Mary's Creek during this event; however, a 5-year event HEC-1
model will need to be created, since this storm event is not a part of the current
hydrologic model for Mary's Creek. The storage-routing of these calibrated
hydrologic models will be updated using the current HEC-2 model for Mary's
Mr. James W. Keller, P.E.
Page 2
December 26, 2001.
Creek. Finally, a calibrated HEC-2 model will be developed using flows from the
new calibrated HEC- 1 models.
3. Proposed Conditions
Using soil boring information, the bottom of the proposed detention pond will be
set at a sufficient height above the ground water table so that ground water does
not infiltrate the detention pond. DEC assumes that the soil information will be
supplied.
The detention analysis will utilize stormwater pumps, which will allow the
minimum elevation of the detention ponds to be located below the flowline
elevation of Mary's Creek. The stormwater pumps will be sized so that the
proposed detention facility is completely emptied (above the permanent water
surface elevation) within 48 hours.
The physical layout of both proposed detention pond alternatives will be dictated
by the Magnolia Drive future alignment, as well as by an existing brine pit. The
Magnolia Drive alignment is proposed to pass through the northern portion of the
detention site. Both detention pond layouts will be revised to account for this
future alignment. Another difficulty is the existing brine pit that divides the
proposed detention pond site in two. Since construction of the detention pond
within the existing brine pit is to be avoided, a box culvert will pass around the
brine pit and will connect the two pieces of the divided detention pond.
A stage vs. volume relationship will have to be developed for each the proposed
detention pond. Using this relationship and the 5-, 10- and 100-year hydrographs
of Mary's Creek, an approximate method (spreadsheet calculations) will be used
to simulate the performance of the proposed pond. From this spreadsheet a
diversion structure configuration will be sized and a diversion relationship (DI-
DQ) for each modeled frequency will be extracted to HEC-1. The storage-muting
for proposed conditions wilt be updated, allowing proposed conditions HEC-1
and HEC-2 models to be developed that simulate the effects of the detention pond
alternatives upon the flood stages of Mary's Creek.
4. Detention Optimization
A trial-and-error sizing will be conducted to optimize flow diversion into the pond
that produces the highest downstream benefits. The results of the HEC-2 analysis
will be used to measure the do~vnstream benefits of proposed detention
configurations. Proposed water surface elevations will be compared to existing
elevations to determine benefits. The results of the benefit analysis and cost
estimate will be used to recommend a detention scheme. A flood frequency for
detention storage will be recommended with input from the GEC and the City of
Pearland.
\\HOO_001 \PROJECTS\ l I 10\IIH ENG\SACI-t\Proposals\Marys Creek Detention Facility Proposal-2.doc
Mr. James W. Keller, P.E.
· Page 3
December 26, 2001
5. Cost Estimate
Once a detention layout has been selected, cost estimates will be prepared for the
proposed detention pond configuration. The cost estimates will include the cost
of acquisition of the detention site property, excavation of the pond, construction
of the diversion structure, construction of the outfall structure and the construction
cost of the detention facility's pump station.
6. Report
Finally, a report that summarizes the methodology and results of the detention
analysis will be submitted. The report will contain a cost estimate for the
recommended detention alternative, as well as exhibits and tables that summarize
the results.
7. Project Management and Coordination
Meetings with the GEC, and City of Pearland (COP) are anticipated on a frequent
basis to keep the project running smoothly. Any meetings with the COP will be
through and coordinated by the GEC. Time for project management and internal
QaJQc are included in this task.
The cost of performing the detention analysis is $27,120.00. The timetable for
completing this detention study is 12 weeks from Notice to Proceed. Unforeseen delays
in obtaining soils and survey data are not plugged into the schedule. If you have any
questions or comments concerning this engineering cost estimate, please do not hesitate
to call me at (713) 527-6365.
Sincerely,
DANNENBAUM ENGINEERING CORPORATION
Ale'fa'ndro C. Flores, P.E.
Senior Project Manager
\\HOU_00 I\PROJECTS\I t 10\HHENG\SACH\Proposals\Marys Creek Detention Facility Proposal-2.doc
CITY OF PEARLAND
MOBILITY & DRAINAGE PROJECT
MARY'S CREEK DETENTION
ID
1
2
3
Task Name
Mary's Creek Detention
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Preliminary Engineering Services
Data Collection
Field Reconnaissance
Authorization H & H
Prep of Contracts
Authorization-Survey,Geotech & ESA
Prep of Contracts
Survey
ROW Mapping
Geotech Studies
Drainage Studies
Phase I ESA
Preliminary Design
Review City of Pearland
Final Design
Authorization
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
Prep of Contracts
ROW Acquisition
Design 30%
Review 30% Design
Design 60%
Review 60%
Design 90%
Review 90%
Complete Bid Documents
Advertize,Bid & Award
Advertize Bid
-
Pre Bid Confrence
Receive Bids
Recommend Award
Award Construction Contract
Construction Phase
Notice to Proceed
Construction
Duration
887 days
238 days
29 days
36 days
O days
7 days
O days
14 days
60 days
60 days
60 days
84 days
Start
Mon 12/10/01
Mon 12/10/01
Mon 12/10/01
Mon 12/10/01
Mon 01/14/02
Tue 01/15/02
Wed 02/13/02
Thu 02/14/02
Thu 02/28/02
Thu 02/28/02
Thu 02/28/02
Thu 02/28/02
60 days Thu 02/28/02
60 days
Thu 05/23/02
14 days Mon 07/22/02
237 days Sun 08/04/02
O days Sun 08/04/02
14 days Mon 08/05/02
Finish
Predecessors
Sat 05/22/04
Sun 08/04/02
Mon 01/07/02
Mon 01/14/02 3SS
Mon 01/14/02 4
Mon 01/21/02 5
Wed 02/13/02 5FS+30 days
Wed 02/27/02 7
Sun 04/28/02 8
Sun 04/28/02 8
Sun 04/28/02 8
Wed 05-/22/02 8
Sun 04/28/02 8
Sun 07/21/02 12
Sun 08/04/02 14
Sat 03/29/03
Sun 08/04/02 15
Sun 08/18/02 17
60 days Mon 08/05/02 Thu 10/03/02 17
60 days
14 days
62 days
14 days
29 days
14 days
30 days
40 days
O days
O days
0 days
0 days
0 days
Mon 08/19/02
Fri 10/18/02
Fri 11/01/02
Thu 01/02/03
Thu 01/16/03
Fri 02/14/03
Fri 02/28/03
Sat 03/29/03
Sat 03/29/03
Sat 04/19/03
Sat 04/26/03
Thu 05/01/03
Thu 05/08/03
365 days Thu 05/15/03
0 days Thu 05/15/03
365 days Fri 05/16/03
Thu 10/17/02 18
Thu 10/31/02 20
Wed 01/01/03 21
Wed 01/15/03 22
Thu 02/13/03 23
Thu 02/27/03 24
Sat 03/29/03 25
Thu 05/08103
Sat 03/29/03 26
Sat 04/19/03
Sat 04/26/03
Thu 05/01/03
Thu 05/08/03
Sat 05/22/04
Thu 05/15/03
Sat 05/22/04
28FS+21 days
28FS+28 days
30FS+5 days
31FS+7 days
32FS+7 days
34
2002
2003
Dec Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
1.11+1.1i1.11.11111111a1.11.111.
-1-:------ -1,
/14
Sep
08/04
Oct Nov
Dec Jan
Feb
Mar
Apr
/29
04/19
t4126
40.- 5101
10
105/08
May
Jun
Jul Aug i Sep ( Oct
Nov
2004
Dec Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
2005
Dec Jan
Turner Collie & Braden Inc.
Project:13-11256
Date: Mon 01/21/02
Task
Split
Progress
Milestone
•
Summary
Rolled Up Task
Rolled Up Split
Rolled Up Milestone O
Rolled Up Progress 1111111111111111111111111111111111111 Project Summary
External Tasks
Page 1