HomeMy WebLinkAboutAdd No 1Wednesday, April 25, 2018
Addendum No. 1
CITY OF SUNNY ISLES BEACH
North Bay Road Drainage Improvements
CITY ITB NO. 18-04-01
To All Bidders:
Bidders for the above-referenced project shall take note of the following changes,
additions, deletions, clarifications, etc. to the Plans and Specifications, which in
accordance with the Contract Documents shall become a part of and have precedence
over anything shown or described otherwise.
Response to Questions
1. What’s the engineer’s estimate for the above referenced job? / Do you have an
Engineer’s Estimate for the referenced project?
Response: Engineer’s cost estimates have not been submitted to the City.
Furthermore, the budget is not finalized for this capital improvement project.
2. How will the determination for bid award be made? Based solely on low bid or
based on bid price and qualifications?
Response: Please refer to section 2.5, Method of Award, which includes price,
qualifications, references, scheduled work commitment, early completion, etc.
3. Will bid award be based on the base bid items only or will the alternate items be
considered for bid award?
Response: Alternate items will be considered in determination of award.
4. Is it required that the prime contractor be a certified well contractor?
Response: All well related work shall be performed by a certified well
contractor.
5. Since the majority of the alternate items involve work not typically performed by a
well contractor, but rather an underground utility or general contractor, would bids
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be accepted from a qualified utility underground or general contractor with a
qualified well subcontractor to complete the “well” related work?
Response: Yes, this would be considered, as long as the General Contractor
attended the mandatory pre-bid conference.
6. Grout
Section 01000 Part 1.5 subpart
H. Grout 20-lnch Liner: Following liner placement, CONTRACTOR to grout the
annular space between the 20-inch diameter liner and the existing 24-inch
diameter well casing with neat cement using the "tremie" method.
Section 03400-Part 3.1 subpart F
F. During grouting, the casing is to be filled with water and pressurized to 60
pounds per square inch (psi). This pressure shall be maintained during cement
emplacement and the cement set up period for 8 hours following the grout stage
completion. Clear water shall be circulated within the casing from bottom to top to
cool the casing during the set-up period.
If tremie pipe method will be used to grout the liner casing. Can a K- Packer be
used with a minimum of two grout lifts? Also, if cool water is to be introduced into
the liner to avoid excessive heat it will not be possible to pressurize the well to
60PSI. Please confirm final line casing size.
Response: K-packer can be used with a minimum of two lifts. Final liner size
is 18-inch in lieu of the 20-inch diameter.
7. Grout
Section 03400 Part 1.2
B. Provide bulk cement units weight tickets for verification of cement quantities
pumped.
Section 03400 Part 2.1
B. Ready-mixed cement will not be allowed for this project unless otherwise
approved by the OWNER or ENGINEER.
Bulk weight tickets are provided by ready mix services. Please clarify if we are
able to use to use bulk mix cement?
Response: Contractor is allowed to use bulk mix cement.
8. Section 03200
Section 1.2 Subpart B
B. Casing liner and dimensions are provided in the well construction specifications
or details. The well casing liner shall be at a minimum, poly vinyl chloride (PVC)
Schedule 40 where PVC casing liner is required.
Wednesday, April 25, 2018
Section 2.2-part A
Certa-Lok SOR 17 locked coupling PVC casing or equivalent. Any equivalent
casing selected must be shown to have sufficient joint and tensile strength,
internal pressure rating, resistance to collapse and ability to withstand all stresses
of construction. Any alternates must be approved in advance by the ENGINEER.
Reference is made to two different types of casing. Can we assume SCHD 40
PVC bell end casing will be used? This type of pipe will reduce cost and will be
sufficient for the casing depths at the site. Also note the largest diameter SOR 17
has a pipe of ID of 15" while 18" DIA SHCD 40 PVC has an ID of approx. 16.8".
Response: 18" DIA SHCD 40 PVC shall be used.
9. Can wire brushing be substituted for water jetting to clean existing steel casing?
Response: Wire brushing can be substituted for water jetting to clean the
existing steel casing.
10. Regarding well cleaning.
Common industry practice for cleaning stormwater wells in South Florida is to
circulate water back to the well this provides sediment control while limiting
impact to road traffic and residents. Typically drill rods are used to drill each well
back to original depth utilizing flooded reverse air drilling method. Sand and
debris will settle in the drillers sludge tank while continuously circulating water
back to the well/well box. Used in conjunction with mechanical surging
produces tremendous gains in capacity. Can this method be used for the well
cleaning?
Response: Yes, above described method can be used.
11. Pay Item #15
Design-Build services that may include but not limited to engineering design,
testing, permitting with all applicable agencies, materials, labor, and equipment
to convert selected drainage wells to injection wells.
There is not enough available information at this time to price alternate item #15.
We recommend the city includes an allowance for this item.
Response: Alternate 15 is excluded. Contractors are not required to provide
bid for this alternate 15. Upon further investigation, should the addition of
injection wells be deemed necessary, further negotiations will be conducted
with successful contractor.
12. Section 03500 Section 3.2 Part E
E. The CONTRACTOR shall employ Best Management Practices (BMPs) to
mitigate potential turbidity and/or solids from entering any surface water body
receiving discharge water. The CONTRACTOR shall install and maintain silt
booms, curtains, or other means required to protect any surface water body
receiving the discharge water. Surface water receiving discharge water shall not
Wednesday, April 25, 2018
exceed 29 nephelometric turbidity units (NTU) above background conditions.
Where applicable, the CONTRACTOR shall maintain appropriate water quality
monitoring records demonstrating compliance with turbidity requirements in the
receiving water body.
a. Biscayne Bay is a protected body of water. Water quality standards to
discharge into the bay are very difficult to impossible to attain. Can we
assume that development discharge will go into nearby wells?
Response: Yes. Please refer to response #9.
b. What is the protocol for development water if the 29NTU standard is not
r eached? The wells on the project have been used for stormwater
discharge for approx. 10 years it might not be possible to reach this level of
water clarity. Can the city qualify a maximum # of hours of development
time?
Response: Contractor to use 8 hours of development time in lieu of the 29NTU
standard.
Revision: (Note: Deletions will be indicated by strikethrough, additions will be
indicated with bold font):
2.36 LIQUIDATED DAMAGES FOR INCOMPLETE PROJECTS
Original Contract Amount Daily Charge Per Calendar Day
$50,000 and under..........................................................................................$763
Over $50,000 but less than $250,000..............................................................$958
$250,000 but less than $500,000..................................................................$1,099
Remainder of section 2.36 remains the same.
END OF SECTION