HomeMy WebLinkAboutIII (B) Approval and Authorization for Mayor and City Clerk to execute Addendum 96-01 to L.J. Nodarse Contract for Geotechnical Work on Starke Lake Boat Ramp AGENDA 6-4-96
OcoeeItem III B
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*or coo.,`>4%.* JAMES W SH RA,P.E.
CITY ENGINEER/UTILITIES DIRECTOR
150 N.LAKESHORE DRIVE•OCOEE,FLORIDA 34761
PHONE(407)656-2322 EXT.142•FAX(407)656-7835
MEMORANDUM
DATE: May 30, 1996
TO: The Honorable Mayor and Board of City Commissioners
FROM: James W. Shira, P.E.
City Engineer/Utilities ector
SUBJECT: Starke Lake Boat Ramp
The contractor for this project, Premier Dredge and Marine, Inc. has begun work on the project
by installing 30 foot long pieces of sheet piling in order to dewater the work area. The first half
of the sheet piling installation went well, but the lake bottom condition changed drastically at
approximately the mid-line of the floating dock. At that point, they were unable to find acceptable
soil to bed the piling in as far down as 72 feet. This condition was not apparent when we did our
initial soils work. Prior to beginning design work on the docks, L.J. Nodarse performed 80 local
soil density tests around each of the two fixed docks and the floating dock structure to determine
the nature of the existing lake bottom soils. Since the existing boat ramps had not settled
noticeably over the many years that they have been in place and since the local soil density tests
indicated reasonably consistent lake bottom conditions, we did not feel that it was necessary to
perform additional expensive testing. The conditions predicted by the initial soils work proved
to be correct in the area north of the mid-line, but even though the hand probes did not indicate
a differing bottom condition, the muck layer south of the mid-line is as much as six times greater.
In this area, there appears to be a semi-solid soil layer below a few feet of muck, but below that,
instead of more solid soil, there is another layer of muck that continues to a depth of at least 72
feet.
We need to have soil borings performed in this area to determine the nature and extent of this
unexpected soil condition so that an alternate dewatering scheme can be developed. These soil
borings will give us a much more comprehensive analysis of the lake bottom in the area in which
the contractor is now having trouble. We will not do similar work in the area that has already
been successfully sheeted unless the results of these tests indicate that the installed sheet piling
may be bedded in unstable soil. It is imperative that the sheet piling be bedded in a stable soil
layer so that when the enclosed area is dewatered the area within the sheet piling will be safe for
-L__
THE PRIDE OF WEST ORANGE I 5C
The Honorable Mayor and Board of City Commissioners
May 31, 1996
Page Two
the workmen. We have received a quote from L.J. Nodarse for the required work in the amount
of $14,771.25. Attached for your review is a copy of their quote as well as a proposed
Addendum to their continuing contract based on this quote. This firm was initially selected due
to their familiarity with the general soil conditions in this area as they were the soils consultant
for the City Hall project.
I recommend that the City Commission authorize and Mayor and City Clerk to execute Addendum
No. 96-01 in the not-to-exceed amount of$14,771.25, with funding to be from General Fund
Contingency, which has a current balance of$75,850.21..
JWS/jbw
Attachments
fie
LI Nodarse
& Associates, Inc.
May 29, 1996
Project No. 94-G-0624.1
TO: CITY OF OCOEE •
150 North Lake Shore Drive
OCOEE, Florida 34761
ATTN: Mr. Jim Shira, P.E.
City Engineer
RE: Lake Starke Boat Ramp and Dock Improvements
Additional Study
Lake Starke, OCOEE, Florida
Dear Mr. Shira:
L.J. Nodarse & Associates, Inc. (LIN) is pleased to present this proposal for completing an
additional subsurface exploration and geotechnical engineering evaluation for the above-referenced
project. A previous study was performed at this site by LJN which was dated February 24, 1995.
During construction of the planned improvements at the site, the contractor began driving sheet
pile to assist in dewatering the site. Driving of piles at the northeast corner of the area
encountered soft soils in excess of 85 feet. The purpose of this study is to develop additional
subsurface data to help design a method for constructing the desired improvements.
SITE AND PROJECT DESCRIPTION
The site is located adjacent to the OCOEE City Hall on the bank of Lake Starke. An existing
complex of 3 docks and 2 boat ramps exist at the site. Continued use of the ramps has caused
erosion at the toe of the ramps. The project includes repairs to the existing ramps, repairs to the
eroded areas, protection of the restored areas from prop wash and dock improvements. Initial
plans were to dewater the entire area to accomplish these tasks. Additional subsurface data is now
required to assist in design of the dewatering system.
Geotechnical, Environmental, & Materials Engineers
807 South Orlando Avenue♦ Suite A ♦Winter Park, Florida 32789♦Telephone 407.740.61 10♦ Facsimile 407.740.6112
Project No. 94-G-0624.1
Page 2
PROPOSED SCOPE OF SERVICES
The proposed scope of services is based on our understanding of the project and our experience
in the area with sites and projects similar to this one. Our exploration is planned to contain the
following:
• Mobilize barge mounted drilling equipment to the site.
• Perform one Standard Penetration Test (SPT) boring to a depth of 125' at the proposed
northeast corner of the bulkhead area.
• Perform one SPT boring to a depth of 75' at the end of the existing east ramp.
• Perform one Standard Penetration Test (SPT) borings to a depth of 50 feet at the end of
the existing west ramp.
• Terminate borings at a shallow depth if 15 to 20 feet of suitable bearing soil is encountered
at the ramp locations.
• Perform visual classification and required laboratory testing of the soil samples obtained
from the SPT borings. Laboratory testing will include six grain size analysis, Atterberg
limits analysis, and organic content tests on appropriate samples.
• Analyze the field and laboratory data to develop engineering recommendations for
bulkhead design and construction of the proposed improvements.
The exploration will be supervised by a qualified Geotechnical Engineer registered in the state of
Florida and the results of the exploration will be presented in a geotechnical engineering report.
This report will specifically offer recommendations on the following items:
• Existing site conditions.
• Exploration, testing and sampling methods.
• Subsurface soil conditions encountered and soil classifications.
• Geotechnical design recommendations for the bulkhead, ramp and dock construction.
PROJECT SCHEDULE
Based on our present schedule, we are prepared to mobilize to begin the field operations for this
project within about 10 days of your authorization to proceed. We anticipate the field portion of
Project No. 94-G-0624.1
Page 3
the study to be completed in approximately 3 days. Engineering analysis, necessary laboratory
work, and report preparation should be completed within approximately 10 days after the
completion of field work.
ESTIMATED COSTS
For budgetary planning, we estimate the total cost of services for the described study will be
approximately $14,771.25. A detailed breakdown of this cost is attached for your convenience.
In computing this budget figure we have assumed the site is accessible to our barge mounted
drilling equipment, that we have right of entry to the site, and that we will not experience
excessive delays due to rubble at borehole locations or for other reasons beyond our control. If
such conditions are encountered that could cause the cost of the exploration to exceed the budget
figure, we will notify the client and obtain approval for the additional work before we proceed.
AUTHORIZATION
To authorize us to proceed with this project, please execute and return a copy of the attached
Agreement for Services. Authorization should be indicated by the person or firm responsible for
payment of our invoice. Please note the attached Agreement for Services forms a part of this
proposal and that our terms are "Net 30 Days."
CLOSURE
LJN appreciates the opportunity to submit this proposal and we look forward to working with you
on this project. If you have any questions or if we can provide any additional information, please
feel free to call us at your convenience.
Sincerely,
L.J. NODARSE & ASSOCIATES, INC.
•
Michael J. Preim, P.E.
Vice President/Chief Engineer
Attachment: Agreement for Services
94-6-0624.1.PRO:1W Pfjm
BREAKDOWN OF SERVICES
ADDITIONAL STUDY
LAKE STARKE BOAT RAMP AND DOCK IMPROVEMENTS
LJN PROJECT NO. 94-G-0624.1
1.0 Field Exploration
1.1 Mobilization of Men & Equipment (Barge Rig)
Lump Sum $5,000.00
1.2 Standard Penetration Test Borings (1 @ 125', 1 @ 75', 1 @ 50' )
0-50'; 150' @ $12.00/ft $1,800.00
50' - 100'; 75' @ $15.00/ft $1,125.00
100' - 150'; 25' @ $26.25/ft $656.25
1.3 Casing(1 @ 100', 1 @ 50', 1 @ 30')
0-50'; 130' @ $8.25/ft $1,072.50
50' - 100'; 50' @ $9.75/ft $487.50
1.4 Grouting(1 @ 125', 1 @ 75', 1 @ 50' )
0-50'; 150' @ $4.50/ft $675.00
50' - 100'; 75' @ $6.00/ft $450.00
100' - 150'; 25' @ $9.00/ft $225.00
TOTAL FIELD $11,491.25
2.0 Laboratory Services
2.1 Organic Content
6 @ $30.00/test $180.00
2.2 Grain Size Analysis
6 @ $50.00/test $300.00
2.3 Atterberg Limits Analysis
6 @ $60.00/test $360.00
TOTAL LABORATORY $840.00
4.0 Engineering & Report
4.1 Senior Engineer; 8 hrs @ $90.00/hr $720.00
4.3 Project Engineer; 20 hrs @ $ 65.00/hr $1,300.00
4.4 Secretarial; 6 hrs @ $30.00/hr $180.00
4.5 Drafting; 8 hrs @ $30.00/hr $240.00
TOTAL ENGINEERING $2,440.00
TOTAL PROJECT $14,771.25
96 -0i
ADDENDUM NO. 0TO
GEOTECHNICAL CONSULTING ENGINEERING SERVICES
GEOTECHNICAL TESTING SERVICES
LAKE STARKE BOAT RAMP AND DOCK IMPROVEMENTS
LAKE STARKE
OCOEE,FLORIDA
96 -0/
This Addendum No.gihereinafter called the Addendum as of this 30th day of May, 1996,shall constitute an
Addendum to the Agreement for Professional Geotechnical Engineering &Testing Services between the City
of Ocoee,Florida(the CITY)and L.J.Nodarse&Associates,Inc. (LJN) (the CONSULTANT)dated the 4th
of January, 1994.
WHEREAS, the CITY and CONSULTANT entered into an AGREEMENT whereby the CITY retained the
CONSULTANT to provide professional engineering services as required from time to time,and WHEREAS
the CONSULTANT will perform consulting engineering services for the CITY as herein defined.
NOW THEREFORE,in consideration of the mutual covenants and promises hereinafter set forth on the part
of both parties to be kept and performed,the parties do mutually agree as follows:
Section 1 -Services of the Consultant
1.1 The CONSULTANT shall perform the engineering services as outlined in the attached proposal#94-
G-0624.1 dated May 29, 1996 relative to the provision of consulting services to the CITY.
Section 2 - Compensation
2.1 Compensation by CITY for engineering services provided under this Addendum shall be computed
under Section II of the AGREEMENT with the compensation for this additional authorization not to
exceed$14,771.25 as outlined in the attached proposal,without further authorization from the CITY.
Section 3 -Time of Completion
3.1 The CONSULTANT shall provide the services as outlined in the attached proposal.
46 .01
IN WITNESS WHEREOF,the parties have executed this Addendum No.the day and year hereinafter set
forth.
CITY CONSULTANT
CITY OF OCOEE L.J.NODARSE&ASSOCIATES,INC.
BY: BY: �'C'ZZst� /S. Scott Vandergrift,Mayor Michael . 'reim,P.E.
A11iST: Al LEST:
Jean Grafton, City Clerk