McBaine Water Treatment Plant Improvements Addendum 3
| Agency: | City of Columbia |
|---|---|
| State: | Missouri |
| Type of Government: | State & Local |
| Category: |
|
| Posted: | Feb 16, 2024 |
| Due: | Feb 23, 2024 |
| Solicitation No: | 26/2024 |
| Publication URL: | To access bid details, please log in. |
|
Bid Information
|
Contact Information
|
Bid Attachments
| File Name | Description | File Size | ||||
| ||||||
|
26-2024 Addendum 3.pdf |
RFP 26/2024 Addendum 3 | 130 KB | ||||
|
Attachment to Addendum 3 -McBaine Water Treatment Plant Improvement.pdf |
Attachment to Addendum 3 | 3.07 MB | ||||
|
26-2024 Addendum 2.pdf |
RFP 26/2024 - Addendum 2 | 90 KB | ||||
|
McBaine Water Treatment Plant Improvements Addendum No.2 02022024.pdf |
Addendum 2 - Construction Documents Project Manual Revisions | 1.95 MB | ||||
|
26-2024 Addendum 1.pdf |
RFP 26/2024 - Addendum 1 | 99 KB | ||||
|
McBaine Water Treatment Plant Improvements Addendum No. 1 01252024.pdf |
Addendum 1 - Construction Documents Project Manual Revisions | 186 KB | ||||
|
RFP 26-2024 Attendees list.pdf |
Pre-Proposal Sign In Sheet | 203 KB | ||||
|
RFP 26-2024 - McBaine Water Treatment Plant Improvements - FINAL.pdf |
RFP 26/2024 - PDF VERSION | 194 KB | ||||
|
RFP 26-2024 - McBaine Water Treatment Plant Improvements - FINAL.docx |
RFP 26/2024 - WORD VERSION | 100 KB | ||||
|
Attachment 1 - 2024-01-02_McBaine_WTP_Project Manual Volume 1.pdf |
Attachment 1 - Project Manual Volume 1 | 11.58 MB | ||||
|
Attachment 1 - 2024-01-02_McBaine_WTP_Project Manual Volume 2.pdf |
Attachment 1 - Volume 2 | 8.07 MB | ||||
|
Attachment 2 - 2024-01-02_McBaine Issued for Bid-Drawings.pdf |
Attachment 2 - Drawings | 185.26 MB | ||||
|
Attachment 3 - Prevailing Wage Order 30.pdf |
Attachment 3 - Prevailing Wage | 210 KB | ||||
|
Attachment 4 - Performance Labor and Material Bonds.doc |
Attachment 4 - Performance Labor and Material Bonds | 55 KB | ||||
|
Attachment 5 - Sample Contract.docx |
Attachment 5 - Sample Contract | 67 KB | ||||
Plan Holders
| Supplier Name | City | State | Contact Name | Phone | |||||
| |||||||||
|
No records to display.
| |||||||||
Attachment Preview
PURCHASING DIVISION
NOTICE TO OFFERORS
ADDENDUM 3 TO REQUEST FOR PROPOSAL (RFP) 26/2024: WATER TREATMENT PLANT
IMPROVEMENTS
Offerors shall note the changes stated herein to the above-mentioned RFP and incorporate these changes in
their proposal. Offerors shall attach a signed acknowledged copy of this addendum to their proposal, if
submitting a hard copy (via paper) or agree to the addendum electronically if submitting through the
electronic bid system on-line.
This addendum consists of the following information:
1) The following clarification/information has been provided by the City of Columbia:
Q1: Spec 00 20 00: Please provide the scope of work/pricing information for the System Integrator and
the Lime Feed System.
A1: Lime feed system price and scope has been provided with Addendum No. 3. City will contract
directly with the System Integrator. Responsibilities are detailed in the Project Manual.
Q2: Specification 46 43 50 Clarifier Mechanism Upflow Solids Contact Type, Paragraph 3.2.C mentions
a minimum 2 inch concrete topping to be swept by the mechanism. Will this concrete topping be a standard
4,500 psi grout or a 5-Star Clarifier grout?
A2: Topping shall be normal weight concrete topping (4,000 PSI) as listed in Table 1, Section 03 31 30
2.3.
Q3: Part 1.2.C.1.a requires submitting fabrication drawings for the drive. Our fabrication drawings are
considered intellectual property and we do not submit those drawings. Please remove this requirement.
A3: Provide fabrication drawings to the extent required to illustrate all required site maintenance
activities.
Q4: Part 2.2.J.2.a requires a stainless steel enclosure. We would propose our cast aluminum torque
waterproof overload enclosure, baked epoxy coated. Please allow cast aluminum for Overload Device
enclosure.
A4: This is acceptable, refer to Addendum No. 3.
Page 1 of 6
Q5: Part 2.3.B.c has hydraulic parameters that cannot be met. Please verify the required upflow rate.
Typically, only the area outside of the mixing zone (only are in the clarification zone) can be used to
calculate the upflow rate. The upflow rate specified does not seem to be achievable for this size tank and
flow.
A5: Up flow rate shall not exceed 1.3gpm/sf. Refer to Addendum No. 3.
Q6: Part 2.3.B.f/g and part 2.5.K have items in the design that taken together don’t seem to be
achievable. Spec requires a recirculation rate of 8-12 times the design flow with a max velocity of 2 fps.
Part 2.5.K.6 specifies an impeller diameter to be 0.9 ration of the column. With a max column diameter of
36” (both 30” and 36” are listed) it doesn’t seem maintain the velocity inside the column as specified is
achievable. Also, to get the level of recirculation required with the limited diameter of the axial flow
impeller inside the column, tip speed would be needed that could very easily destroy the floc, that would go
contrary to part 1.1.C.1 that requires tip speeds that will not be destructive to the floc. The general
description of the system detailed in that same part 1.1.C.1 describes the flow as entering the center column
(based on configuration) and entering a larger recirculation drum. However, if the impeller is specified to be
in the column the recirculation flow will be in the column, and it seems the recirculation drum mentioned
there will only serve as a baffle. We would propose that a large diameter turbine with low tip speeds and
high recirculation rates, be used for recirculation that could meet these requirements. Please verify if the
intent is to have a large diameter, radial flow turbine, or the axial impeller.
A6: Refer to Addendum No. 3
Q7: Part 2.4.B.3 requires either a stainless steel or fiberglass chain guard for the drive. We would
propose a galvanized chain guard. Please allow galvanized steel for an acceptable material for the chain
guard.
A7: Galvanized is acceptable, refer to Addendum No. 3
Q8: Part 2.5.F.2.a requires the pinion to not have a lower bearing support. This contradicts part
2.5.F.3.a.2 that requires that the pinion be supported both top and bottom. We would propose that the pinion
be required to be supported both top and bottom to ensure proper alignment and avoid overhung loads.
Please verify requirement.
A8: The specification is correct as written. Primary reduction unit shall have the capacity to fully support
the pinion gear as if the lower support bearing gear is not available. Further, the specification requiring both
top and bottom support pinion is applicable to be conservative.
Q9: O’Keeffe’s Inc. has produced quality aluminum ladders since 1956. O’Keeffe’s Inc. respectfully asks
for your approval to McBaine Water Treatment Plant Improvements project. O’Keeffe’s Inc. is the
leading and most specified U.S.A. ladder manufacturer. Our product capability brochure is enclosed. On
balance, we are less expensive than steel when evaluating long term, maintenance free engineered
construction.
O’Keeffe’s Inc. has 65 years of custom design, engineering, and fabrication experience, and were the first to
introduce a patented serrated square rung for maximum foot traction.
The use of high strength aluminum extrusions provide engineered strength with resistance to rust and
corrosion without the need of a special finish. All our ladders, platforms, custom stairs, and custom access
Page 2 of 6
configurations are designed and engineered to meet OSHA/ANSI standards and can be provided with many
safety accessories. We invite you to review our online project gallery: http://www.okeeffes.com/photos/ or
our link in AIA Master Specifications: www.productmasterspec.com/Profile/OKeeffes_Inc/62488.
There may be additional costs for engineering calculations if needed, which will be added to the proposal.
Thank you for your consideration. O’Keeffe’s Inc. looks forward to providing your Division 5 ladder,
platform or other access needs
A9: Substitutions will be reviewed during the submittal review phase provided the product meets the
specifications. Refer to 01 25 00 for substitution procedure.
Q10: Several of my manufacturer's are asking if the McBaine WTP project needs to meet BABA
requirements. An attachment was included in your RFP, which is attached indicating that the project needs
to meet BABA, however from my understanding the project is funded through bonds that were sold and did
not include federal funding, which to my understanding would not require BABA compliance. Therefore
does the equipment / project require BABA compliance?
A10: The project does not need to meet BABA requirements. ARPA and BABA requirements are
removed from the project.
Q11: Specification 40 05 51 3.3 Valve Schedule lists the High Performance Modulating Butterfly valves as
24" in size. However, Sheets 40D101 thru 40D304 show these valves on pipelines that scale to 18"
diameter. Please confirm these valves are to be 18".
A11: All filter effluent valves shall be 18". Refer to Addendum No. 3.
Q12: Sheet 45D301 points to a ductile spool on the 10" RCL and notes it as a dismantling joint, however it
is drawn as a standard spool. Please confirm whether a dismantling joint is required in this location.
A12: Dismantling joints are not required. Refer to Addendum No. 3
Q13: In the PDF snapshot below from Sheet 40D301, there is a random rectangle on the existing 18" FE
line, and a random rectangle and what appears to be a single flange on the existing 24" FE line. Please
clarify if this is to indicate work to be performed in these areas, and what that work may consist of.
Page 3 of 6
A13: Drafting error, no flange required.
Q14: The pump discharge lines on Sheet 45D101, the shown check valves are very short in length,
indicating they may be either double disc check valves or silent check valves. However, neither of these
check valves are typically used for waste lines. Please clarify the type of check valve to be utilized in this
location.
A14: Wafer check valves are required due to limited space, refer to Addendum No. 3.
Q15: The insulation schedule in 40 42 00 3.3 generally seems to apply to domestic plumbing & HVAC
systems. However, when it lists "Cold Water Potable and Non-potable, Coil Condensate" pipelines as
receiving 1" of insulation, is this only in reference to the domestic plumbing systems, or are we to also
insulate the 6" PW ductile iron systems in Area 30, the 6" ductile iron PW in Area 40, and the 4" ductile iron
NPW system in Area 50? Where existing, these lines do not appear to be insulated.
A15: No insulation required for 6” PW DIP or 4” NPW systems. Insulation will be required for pipes
installed on the exterior of the buildings (exposed to atmosphere) or buried with less than 42” cover.
Q16: Rotary Lobe Blower Section 43 11 33 – 4 – 2.2 B. 1. f. – This section calls out the blower scfm at
3380 which is equivalent to 5.0 scfm/sf. The blower pressure is called out at 5.5 psi. We designed our
underdrain system around 4 scfm/sf. 5 scfm/sf is Okay, but you will need to increase the blower pressure by
0.5 psi. We are at 5.55 psi through our system and the static head in the filter. Adding 0.5 psi will cover any
unknow losses or piping/valve losses.
A16: The pressure shall be calculated when the blower is turned off and the water is at the bottom of the
wash water trough.
Q17: Filter Media Section 46 53 45 – 2 and 3 – 1.5 D. – Leopold does not recommend on site testing of
filter media due to the errors that can be made in sampling the filter media in the field. Leopold will provide
pre-shipment testing at an independent laboratory but do not agree to the on-site testing.
A17: Site testing by Owner will be removed from the specification. Refer to Addendum No. 3.
Q18: Section 46 53 45 – 2.1 A. – Leopold is not named the filter media section. Please add Leopold as one
of the name media suppliers. We are the largest supplier of filter anthracite in the USA.
A18: Substitutions will be reviewed during the submittal review phase provided the product meets the
specifications. Refer to 01 25 00 for substitution procedure.
Q19: Section 46 53 45 – 2.2 D. 2. d. – MOH hardness is called out at 3.0. We suggest 2.8 which is
AWWA B100 standard. We are running anywhere from 2.9 to 3.1 MOH hardness depending on testing Lab.
Anthracite is a natural occurring material and testing variances can come in just under 3.0.
A19: MOH hardness will be updated, refer to Addendum No. 3.
Q20: Section 46 53 45 – 3.2 B. 6. a. – This section calls for 7/8” skim of the sand but earlier section call
for 5% skimming allowance (0.6”). We will provide the 7/8” skim allowance and no % extra if you agree.
Page 4 of 6
A20: The filter media depth shall be as specified after skimming is complete. It is up to the contractor to
determine how much additional media is required.
Q21: Media Section 46 53 45 – 3.2 C. 8. a. – This section calls for 1 3/8” skim of the anthracite but earlier
section call for 5% skimming allowance (1.2”). We will provide the 1 3/8” skim allowance and no % extra if
you agree.
A21: The filter media depth shall be as specified after skimming is complete. It is up to the contractor to
determine how much additional media is required.
Q22: Filter UnderdrainSection – 46 53 46 – 3 2.3 C. – This section calls for 5 scfm/sf – again which is
Okay.We ran our calculation for 5 scfm/sf and you may want to bump up the blower psi to 6.0. See
comment above
A22: The pressure shall be calculated when the blower is turned off and the water is at the bottom of the
wash water trough.
Q23: Underdrain Section – 46 53 46 – No underdrain service is called out - We will include 33 days on
site 22 travel in 11 trips in our proposal
A23: Underdrain vendor to work this out with the General Contractor.
Q24: Drawings Drawing 40D501 – Detail (bottom left) shows a flume that is 3’-0” wide by 4’-0” deep.
According to our old contact drawings from 1970, 1995 and 2005 the flume is 3’ wide by 4’ deep BUT at the
top of the flume it narrows to 18” in each phase. Please see the attached drawing from 2005 that shows the
18” opening as an example. Leopold will make the assumption that the flume does narrow to 18” wide at
the top in all 16 filter cells. Please confirm that is the case.
A24: The concrete slab is planned to be removed in order to take the piping in. Keynote 4 on 40D501 will
be updated. Refer to Addendum No. 3.
Q25: When looking through the specs I didn’t see anything about this job being AIS or BABA. Can you
point me in the right direction. If this is AIS or BABA can you send over the forms so I can have my vendors
fill this out when they send over their quotes.
A25: See answer to Question 10 above.
NO OTHER ADDITIONAL CHANGES MADE
CALE TURNER
PURCHASING AGENT
Page 5 of 6
This is the opportunity summary page. You are currently viewing an overview of this opportunity and a preview of the attached documentation.
For more information, please visit the Publication URL Web page.
Daily notification on new contract opportunities
With GovernmentContracts, you can:
- Find more opportunities and win more business
- Receive daily alerts for all new bid opportunities
- Get contract opportunities matched to your business
* Disclaimer: Information regarding bids, requests for proposals (RFPs), or requests for qualifications (RFQs) is provided on this website only as a convenience and does not constitute official public notice. Persons wishing to respond to or inquire about bids, RFPs, or RFQs should contact the appropriate government department.