ESBD_472042_1766104636381_Addendum NO. 2 - Bid NO. 26-04 SBR Pre-Selection Proposal Request - N.B. Davidson.pdf
PDF 274 KB Posted
- Attached to
- RFP 26-04 N. B. Davidson Wastewater Treatment Plant Expansion and Improvements, SBR Pre-Selection
- Solicitation number
- RFP26-04
- Issued by
- Van Zandt County, Houston City, Texas
About this file
This is Addendum #2 to a Request for Proposals (RFP) issued by the City of Huntsville, Texas for the N.B. Davidson Wastewater Treatment Plant Expansion and Improvements project (Bid #26-04). The addendum modifies specifications for Sequencing Batch Reactor (SBR) equipment and related components. Key modifications include: the SBR manufacturer shall furnish five (5) positive displacement blowers—two per active basin with one interchangeable spare, assuming no more than two basins operate in the aeration cycle simultaneously; four (4) dissolved oxygen (D.O.) control systems, one per basin, consisting of a D.O. probe with mounting bracket and an analyzer capable of utilizing operator-adjustable D.O. setpoints to control blower on/off operation during aeration periods; and four (4) ammonium-based aeration control (ABAC) systems, one per basin, each consisting of an ammonium ion selective electrode probe with mounting bracket, an analyzer, and an air blast cleaning system. The original bid submission deadline is January 13, 2025, at 2:00 p.m. Central Standard Time, and all respondents must acknowledge receipt of this addendum and submit the signed form with their bid packets or face disqualification.
The addendum also addresses technical clarifications regarding programmable logic controller (PLC) systems, confirming that the Rockwell Automation CompactLogix 1756 PLC is an acceptable substitution for the originally specified CompactLogix 5380 system if required to meet BABA compliance requirements. A subsequent addendum (#3) will address whether the general conditions for the construction contract (C-700) or the general conditions for procurement (P-700) apply to the SBR manufacturer bidding process. The document provides contact information for Lucy Gonzalez, CTCD Procurement Manager at the City of Huntsville, at (936) 291-5495 or purchasing@huntsvilletx.gov for additional inquiries.
View the file
Other files
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
Text version
Page 1 of 2 Bid # 26-04
ADDENDUM #2
Title Bid Number Closing Date Issued Date
N.B. Davidson Wastewater
Treatment Plant Expansion and Improvements, SBR Pre-
Selection
26-04
January 13, 2025, at 2:00 P.M.
Central Standard Time
December 18, 2025
TO ALL PROSPECTIVE BIDDERS:
The information contained in this Addendum supersedes information contained in the Contract Documents to the extent indicated. All information contained in the Contract Documents remain in full force and effect unless specifically modified herein. All Respondents shall acknowledge the receipt of the Addendum in the space provided on this Addendum Form and submit this form with your bid packet. Failure to do so will result in Respondent disqualification.
The attention of all prospective Respondents is directed to the following modifications for the above referenced project.
Questions and Answers Question No. 1: Can you please confirm that the general conditions for the construction contract (C-700) are not applicable to the bidding SBR manufacturer? Should P-700 (General conditions for procurement) be included in the bid documents instead?
Answer: Will be answered on December 30, 2025 via Addendum #3.
Question No. 2: Section 40 63 43 Programmable Logic Controllers 2.3.B. says that the Rockwell
Automation CompactLogix 5380 is the only approved PLC system. In order for the control panel to be
BABA complaint, Aqua-Aerobic Systems would like to use ControlLogix 1756. Please confirm that this
PLC system is acceptable.
Answer: Yes, Rockwell Automation CompactLogix 1756 PLC is an acceptable substitution, if required to meet BABA compliance requirements.
City of Huntsville
448 State Highway 75 N
Huntsville, TX 77320
Lucy Gonzalez, CTCD
Procurement Manager
Telephone: (936) 291-5495
Email: purchasing@huntsvilletx.gov mailto:purchasing@huntsvilletx.gov
Page 2 of 2 Bid # 26-04
Specifications:
1. The following modifications have been made to specification 43 11 30 – Positive Displacement
Blower – Data Sheet:
2. The following modifications have been made to specification 43 53 61 - Sequencing Batch Reactor
(SBR) Equipment:
Section 2.6.B.1. - SBR Manufacturer shall furnish a total of five (5) positive displacement blowers in accordance with Section 43 11 30 – Positive Displacement Blowers, two per active basin, with an interchangeable spare assuming no more than two basins are in the aeration cycle at any time.
Section 2.6.J.1. - SBR Manufacturer shall furnish a total of four (4) dissolved oxygen (D.O) control systems, 1 per basin, in accordance with Section 40 70 10 – Instruments. One dissolved oxygen control system consists of one (1) D.O. probe with mounting bracket and one (1) analyzer. The D.O.
control system shall utilize operator adjustable D.O. setpoints to control blower on/off operation during the aeration period.
Section 2.6.J.3. - Provide an ABAC cascaded to DO control system capable of interfacing with the SBR control system. SBR Manufacturer shall furnish a total of four (4) ammonium-based aeration control (ABAC) systems, 1 per basin, in accordance with Section 40 70 10 – Instruments. One ABAC control system consists of one (1) ammonium ion selective electrodes (ISE). probe with mounting bracket and one (1) analyzer. The
D.O. control system shall utilize operator adjustable ammonium setpoints to control blower on/off operation during the aeration period. Include air blast cleaning system.
Please include signed copy of Addendum with submitted Solicitation Packet.
Responder Name: ____________________________________________________________________
Address: ___________________________________________________________________________
Telephone Number: ________________________ ________________________________
Printed Name of Contact
Fax Number: _____________________________
Email Address: ____________________________ ________________________________
Authorized Signature
File details come from the government source that posted it. Updated .