HomeMy WebLinkAboutItem 08 - 2006 Inflow and Infiltration ProjectAward of Engineering Services Contract - 2006 Inflow and Infiltration Project
GSWW, Inc
This project is necessitated by aging infrastructure resulting in increased infiltration and
inflow of surface water and groundwater into the existing sanitary sewer lines. The
additional groundwater and surface water introduced into the sanitary sewer collection
system causes excess flow to the wastewater treatment facilities and potential overflows
from sewer manholes.
The sanitary sewer lines proposed for rehabilitation in this project have been identified
by previous investigations to have excessive infiltration and inflow into the lines.
The design is proposed to incorporate trenchless construction where the existing lines
will be burst in place and simultaneously replaced with a new line. New sewer services
and cleanouts will be installed for residents served by the lines in these areas.
The construction budget is estimated by GSWW to be approximately $1.6 million dollars
and the design fee is proposed as an additional $67,620.00. GSWW specializes in this
type of work and is well qualified.
Staff recommends approval.
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0:\agenda\200612-21-06\Engineering Service Contract GSWW, Inc.
February 15, 2006 (10:09AM)
PROPOSAL FOR ENGINEERING SERVICES
DATE: February 3, 2006
TO: City of Grapevine
P.O. Box 95104
Grapevine, Texas 76099
FROM: GSWW, Inc.
Civil/Environmental Engineers
11117 Shady Trail
Dallas, Texas 75229
Project: 2006 Sanitary Sewer Improvements
-Laguna Vista Area (5,235 LF)
-Lucas Addition (12,106 LF)
-San. Sewer Aerial Crossing at Lipscomb
PART IA: PROJECT DATA COLLECTION
A. Obtain roadway, storm sewer, water & sanitary sewer as-builts from City.
B. Obtain property ownership data from Tarrant Appraisal District.
C. Obtain easement and right-of-way information from platted property provided to
GSWW by the City.
D. Review existing sanitary sewer CCTV logs for the project areas. Logs to be
provided to GSWW by the City or White Rock Consultants.
E. Review City standards, specifications and special requirements regarding street,
water and sewer line construction.
F. Obtain plans on any ongoing design work adjacent to the project.
G. Request existing plans from utility owners concerning electrical, telephone, cable
television, long distance communications and natural gas.
H. Meet and discuss with City personnel to determine any special conditions that may
affect project design and construction.
I. Meet and discuss with City personnel concerning construction phasing and plans
preparation.
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PART IB: PRELIMINARY DESIGN
A. Utilize existing G.I.S. data provided by the City of Grapevine to prepare a location
map of all sanitary sewers to be replaced. GSWW will attempt to update the Cities
G.I.S. data in order to show the existing sanitary sewer actual location. No sanitary
sewer profiles will be provided. All sanitary sewer mains and laterals are to be pipe
bursted except for the Lipscomb aerial crossing. GSWW will show the approximate
location of existing waterlines with the help of City staff.
B. All replacements are based on City of Grapevine recommendations.
C. Incorporate lot lines into the plans set from information gathered through the G.I.S.
data set.
D. Submit two 11 x 17 sets of preliminary construction plans at 50%.
E. Submit two 11 x 17 sets of preliminary construction plans and specification booklets
at 90%.
F. Submit two 11 x 17 sets of preliminary construction plans and specification booklets
at 100%.
G. Prepare and submit any special condition requirements.
H. Prepare opinion of probable cost based on preliminary design.
I. Maintain contact with City personnel during the project design and attend meetings at
50%, 90% and 100% plans review.
J. Prepare TxDOT Permit for construction along Northwest Highway.
A. Incorporate City review comments into final design
B. Develop any necessary additional design details.
C. Develop final quantities and prepare summary sheets. Determine opinion of probable
cost estimate based on final design.
D. Finalize any special conditions to the contract documents.
E. Submit one full-size set of final construction plans, quantities, costs and special
conditions to City staff for final review.
F. Incorporate City review comments of final design.
G. Prepare final signed and sealed plans and specification booklets, quantities, estimated
costs and special conditions.
PART II: BIDDING PHASE (Laguna Vista & Lucas Areas Onlvl
A. Provide 40 full-size sets of prints of the final construction plans and specifications to
the City for bidding. (City to advertise and bid project)
B. Prepare any addenda, City to distribute.
C. Attend pre-bid conference and bid opening.
D. Assist the City in checking references of low bidder.
E. Prepare conformed documents for construction.
PART III: CONSTRUCTION PHASE
A. Attend pre -construction meeting and provide responses to requests for information or
clarification to the City or Contractor.
B. Provide periodic site visits by the design engineer with a written inspection report
submitted to the City for each visit. (Maximum 5 visits).
C. Review of Contractor's monthly and final payment requests.
D. Provide assistance during final observation and acceptance of project.
E. After final acceptance of the Project, GSWW will provide construction drawings in
digital PDF format and ACAD 2000 drawing files. Due to the nature of the project,
22 x 34 mylar drawing will not be provided. A final set of reproducible color 11 x 17
drawings will be provided.
PART IV: SPECIAL SERVICES
A. SURVEY FOR DESIGN
1. Per the City of Grapevine, the only survey for this project will be the
Lipscomb aerial crossing (400').
2. Surveyor to establish horizontal and vertical control tied to the City of
Grapevine monument system using G.P.S. survey methods.
3. Surveyor to research, deed sketching, corner ties and boundary analysis to
determine lot and parcel boundary locations adjacent to the routes surveyed
for the Lipscomb sanitary sewer replacement.
4. Survey to locate the sanitary sewer manholes, improvements adjacent to the
line, and trees 4" and above within 20' of the sewer alignment. Elevations
will be taken on all manhole flowlines, top of exposed sanitary sewer (aerial
crossing) and at 50' intervals along the existing route for the Lipscomb
sanitary sewer replacement.
5. On the side of the street where the sanitary sewer is located the horizontal and
vertical location of the existing facilities from back of curb to the R.O.W.
shall be surveyed, including existing pavement and curb, fences, trees, lead
walks, and mailboxes.
6. All utility appurtenances such as water valves, fire hydrants, manholes, inlets
etc., will be obtained (within the constructions area).
7. Engineer review of surveyor's work.
8. Incorporate survey files into design and reducing data files.
B. STRUCTURAL DESIGN
1. Provide the necessary information to Structural Consultant for the design of a
sanitary sewer aerial crossing.
2. Incorporate Structural Consultants details into plans set.
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PART V: EXCLUSIONS
A. Drainage plans or drainage design, including drainage area map.
B. Sanitary Sewer Capacity Analysis.
C. Profile Sheets
D. Traffic Control Plans.
E. Erosion Control Plans
F. Detailed construction staking.
G. Full time construction inspection.
H. Preparation of Easement descriptions and exhibits.
1. Preparation of Right -of -Way descriptions and exhibits.
J. Internal inspection of sanitary sewer lines.
K. Trench excavation safety plan.
L. Preparation of Contractor's monthly pay estimates.
M. Utility Locate Service.
N. HEC II & Hydraulic Studies.
O. Geotechnical reports.
P. Quality control and testing services during construction.
Q. Structures: retaining walls, etc. not included in proposal (engineering services
includes one sanitary sewer aerial crossings).
R. Public Meetings
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(Section 2)
PAYMENT SCHEDULE
Payment for engineering services described under (Section 1) - Parts I, II, and III shall be an
amount not to exceed Fifty Nine Thousand Seven Hundred Seventy Dollars and Zero Cents
($59,770.00).
Special services shall be invoiced on the actual costs plus 15%. The not to exceed amount for
special services is Seven Thousand Eight Hundred Fifty Dollars and Zero Cents ($7,850.00).
The maximum overall fee established herein shall not be exceeded without written authorization
from the City, based on increased scope of services.
The following is a summary of the estimated charges for the various elements of the proposed
services:
Part IA
Project Data Collection
$ 4,200.00
Part IB
Preliminary Design
$ 39,400.00
Part IC
Final Design
$ 7,250.00
Part II
Bid Phase Services
$ 6,020.00
Part III
Construction Phase
$ 2,900.00
Estimated Basic Services Subtotal: $ 59,770.00
Part IV: Special Services:
a) Survey for Design $ 2,900.00
b) Structural Design $ 4,950.00
Estimated Special Services Subtotal: $ 7,850.00
(Time and Materials Costs Not to Exceed)
Total Maximum Fee Not to Exceed $ 67,620.00
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(Section 3)
PROJECT COMPLETION SCHEDULE
(Time starts from Written Notice -to -Proceed)
*Weeks are considered 5 working days
Project Data Collection
Preliminary Design 50%
City Review
Preliminary Design 90%
City Review
Preliminary Design 100%
weeks
City Review
Final Design
Sincerely,
GSWW, INC.
Dr. Steven D. Sanders, P.E.
Executive Vice President
2 weeks
8 weeks
1 weeks
4 weeks
1 weeks
2
I weeks
I weeks
Total Estimated Completion Time 20 weeks*
M
GSWW, Inc, OPINION OF PROBABLE COST
Civil/ Environmental Engineers & Planners Preliminary Estimate
PROJECT: OWNER: City of Grapevine, Texas
Job # 1095-001
2006 San. Sewer Improvements DATE: February 3, 2006
-Luca Area
-Laguna Vista Area
-Dove Road Aerial Crossing
ITEM
EDESCRIPTION
OF UNIT
UNIT
UNIT
QUANTITY PRICE
COST
1
Mobilization
LS
1
$10,000.00
$10,000.00
2
Trench Safety Design & Implementation
LS
1
$3,000.00
$3,000.00
3
Open cut 8' san. Sewer
LF
400
$40.00
$16,000.00
4
Rehab ex. 6" or 8" San. Sewer with 8" HDPE San Sewer by Pipe Bursting
LF
15780
$45.00
$710,100.00
5
Rehab ex. 12" San. Sewer with 12" HDPE San Sewer by Pipe Bursting
LF
1338
$75.00
$100,350.00
6
Rehab ex. 16" San. Sewer with 16' HDPE San Sewer by Pipe Bursting
LF
223
$85.00
$18,955.00
7
Pipe Burst Long Side San. Sewer Services with cleaned
EA
126
$2,200.00
$277,200.00
8
Open Cut Short Side San. Sewer Services with cleanout
EA
159
$450.00
$71,550.00
9
HMAC Pavement
TN
100
$75.00
$7,500.00
10
Concrete Curb and Gutter
LF
200
$7.50
$1,500.00
11
6" thick Concrete Driveway Repair
SY
100
$50.00
$5,000.00
12
4' Diameter Sanitary Sewer MH Replacement
EA
37
$3,000.00
$111,000.00
13
Std. Mainline Cleanout Replacement
EA
11
$600.00
$6,600.00
14
Turf Establishment
SY
6000
$5.50
$33,000.00
15
1
Point Repairs (based on 10% of pipe total)
LF
1734.
$40.00
$69,364.00
16
8" Sanitary Sewer Aerial Crossing
EA
1
$12,500.00
$12,500.00
SUBTOTAL:
10% CONTINGENCY:
TOTAL:
$1,443,619.00
$144,361.90
$1,587,980.90
In providing opinions of probable construction cost, the Client understands that the Consuitard has no control over the cost or
availability of labor, equipment or materials, or over market conditions or the Contractor's method of pricing, and that the
Consulfanrs opinions of probable construction cost are made on the basis of the consuitanrs professional judgment and
experience. The Consultant makes no warranty, express or implied, that the bids or the negotiated cost of the Work will not vary
from the Consultant's opinion of probable construction cost