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ADDENDUM # 1
Response to Questions for North Bay Road Drainage Improvements
Invitation to Bid No. 18-04-01
1. / Do you have
the referenced project?
Response:
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 be accepted from a qualified utility
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
North Bay Road Drainage Improvements
Invitation to Bid No. 18-04-01
Response to Questions Page 1
(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.
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.
North Bay Road Drainage Improvements
Invitation to Bid No. 18-04-01
Response to Questions Page 2
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 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 reached? The wells
North Bay Road Drainage Improvements
Invitation to Bid No. 18-04-01
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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.
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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.
North Bay Road Drainage Improvements
Invitation to Bid No. 18-04-01
Response to Questions Page 4