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ADDENDUM #6 TO CONTRACT DATED JANUARY 21 , 1997 BETWEEN INDIAN RIVER
COUNTY AND MASTELLER & MOLER, INC. FOR CR 512 PAVING & DRAINAGE
IMPROVEMENTS
INDIAN RIVER COUNTY PROJECT #9611
COUNTY ROUTE 512 CORRIDOR IMPROVEMENTS
ROSELAND ROAD TO I-95
INDIAN RIVER COUNTY, FL
I. ADDITIONAL SERVICES IN CONNECTION WITH THE FOLLOWING CONSTRUCTION
PLAN PREPARATION SERVICES .
Masteller & Moler, Inc. has completed the design of the stormwater improvements for the County Route 512
Corridor Improvements . The roadway improvements are supported by five (5) separate stormwater
management basins designated as Basins A, B , C , D, & E . This scope of services relates to the completed
stormwater management design for Basin D within the County Route 512 Corridor Improvements project.
The Basin D stormwater lake is proposed to be situated on the south side of CR512 between County Route
510 and the St. Sebastian River Bridge. A private developer has proposed a single-family home subdivision
known as Sebastian Landings on a portion of lands within the CR 512 project that were proposed to be
utilized for Stormwater Lake D . It has been determined to be in the County ' s best interest to coordinate the
designs of the stormwater systems supporting both projects. In order to properly coordinate the designs
between the two projects, we shall perform the following services :
Scope of Services
Under this task, a re-analysis shall be completed to consider coordinating the design of the CR512 Basin D
stormwater improvements with the proposed Sebastian Landings project stormwater design. We shall
evaluate the feasibility for raising the treatment volume vertical storage limit by elimination of the proposed
Lake D littoral zone. This would allow for use of a more compact parcel of land to support Drainage Basin
D in the CR 512 project. We shall also complete an evaluation of the required treatment system necessary to
provide for contributing stormwater drainage sheds from both the CR512 and Sebastian Landings site to a
common stormwater lake . We shall also develop amended stormwater modeling within ICPR to verify that
the design of the modified Lake D stormwater lake has sufficient capacity to attenuate the post-development
peak runoff to pre-development rates.
We shall meet with County staff and the private developer to coordinate acceptance of the modified design
for Stormwater Lake D . Following acceptance of the modified preliminary design, we shall finalize the
amendments to the Construction Plans and the stormwater management report for the CR512 project. The
Construction Plans Sheets that will be amended will be, as a minimum :
• Plan & Profiles ( 15 & 16)
• Summary of Pay Items
• Summary of Drainage Quantities
• Drainage Map
• Pond "D" Details
• Cross-sections .
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Addendum #6
03/ 13/03
Page 2
The Stormwater Management Report shall be modified to support application to the St. Johns River Water
Management District (SJRWMD) for a modification to the previously issued Environmental Resource
Permit (ERP) .
We shall prepare and coordinate execution of the SJRWMD application form for modification to the ERP .
We shall prepare supporting information including amended plans and stormwater management reports for
submittal to the SJRWMD .
It is anticipated that the SJRWMD will issue a Request for Additional Information (RAI) pertaining to this
permit modification request. We shall develop a response to the District ' s concerns relating
to the
stormwater management system design modifications . Our scope of services does not include any responses
to concerns relating to wetlands and/or endangered species issues .
Following approval of the ERP modification, we shall provide Indian River County with five (5) copies of
the revised Construction Plan sheets and one ( 1 ) copy of the amendment to the Stormwater Report pertaining
to this scope of service.
The Scope of Services for this project will be expanded to provide for the above described
Design/Permitting/Construction Services listed above for the Lump Sum Fee of $ 10,815 . 00
IN WITNESS WHEREOF the parties hereto have executed these presents this 1st day of Apri 1
2003 .
MASTaephen
;E.
MOLER, INC . INDIAN RIVER COUNTY COMMISSION
220514 Indian River County, Florida
By: By:
Moler, P.E. Kenneth . Macht
Vice President Chairman
BCC Approved : April 1 , 2003
Attest: /
Jeffrey K. Barton
Clerk of Court
APPROVED AS TO FORM
D LEGAL w` --
SUFFI Indian �7iver County ,approved
Date
sem/vk Administration 3 � v
File #9649LR Budget
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