4-IFB25-26 06 Add No 2.pdf

REQUEST FOR PROPOSALS IFB25/26-06

FOR POTABLE WATER STORAGE FACILITY

CLEANING & INSPECTION SERVICES

TO ALL POTENTIAL BIDDERS:

Attached are the following:

1. Addendum No. 2 to the above referenced Request for Proposals (RFP).

2. Signature page acknowledging receipt of this Addendum No. 2, to be provided with the bid.

All other provisions of the Solicitation shall remain in full force and effect.

08/12/2025 /s/ Robert Ferro Date Purchasing Officer Procurement & Contracts Division

Solicitation No.: IFB25/26-06 Addendum No. 2 Title: Potable Water Storage Facility Cleaning & Inspection Services Page 2 of 2

The purpose of this Addendum No. 1 is to amend the Solicitation Documents as specified below.

Changes are highlighted in yellow for ease of reference where applicable.

1. Section 2.4, “Solicitation Timeline,” is here by deleted and replaced with the following in lieu thereof:

Activity Date

Bid Issued: August 1, 2025 Mandatory Pre-Bid Meeting & Site Visits: August 20th & 21st @ 8:00 a.m.

Questions From Bidders Due: August 22, 2025 District’s Responses to Questions (Addendum): August 25, 2025 Bid Due Date: September 4, 2025 by 3:00 p.m.

Anticipated Award: October 2025

2. Appendix C is hereby deleted and replaced in its entirety with the following documents, in lieu thereof:

PLEASE RETURN A SIGNED COPY OF THIS SIGNATURE PAGE WITH YOUR

PROPOSAL. FAILURE TO DO SO MAY DEEM YOUR PROPOSAL NON-RESPONSIVE.

The undersigned acknowledges receipt of Addendum No. 2 and all its corresponding attachments.

Signature

Printed Name

Title

Appendix C Description of District Potable

Water Storage Facilities & BMP’s

DESCRIPTION OF ACWD POTABLE WATER STORAGE FACILITIES

The District owns and operates thirteen (13) drinking water facilities in the cities of Fremont and Union City; seven (7) above ground steel tanks and six (6) underground storage reservoirs.

C.1 Tanks (Table C.1 has additional information regarding each tank):

T01 – Appian Tank is located at 1200 Appian Way in Union City. Appian Tank was constructed and placed in service July 2016.

T02 – Canyon Heights Tank was built in 1999 and is located at 37908 Canyon Heights Drive in Fremont.

Canyon Heights Tank was seismically upgraded recoated in 2020.

T03 – Hidden Valley Tank was built in 1979 and is located at 1183 Saguare Terrace in Fremont. This tank has a PAX Mixer, has heavy corrosion, and has its original interior coating which is failing.

T04 – Vineyard Heights Tank is located at 45400 Grapevine Terrace in Fremont. This tank was built in 1987 and was seismically upgraded and recoated in 2009.

T05 – Mission San Jose (MSJ) Treated Water Tank was built in 1974 and is located at 42500 Vargas Road in Fremont on the property of Mission San Jose Water Treatment Plant.

T06 – Ohlone Tank is located behind Ohlone College in Fremont. This tank was taken over by the District and refurbished in 1998.

T07 – Avalon Tank was built in 1995 and is located at 5097 St. Francis Terrace in Fremont.

C.2 Reservoirs (Table C.2 has additional information regarding each reservoir):

R01 – Alameda Reservoir was built in 1972 and is located at 585 Shoshone Ct in Fremont. This reservoir has a submersible mixing pump with chlorine and ammonia addition. The liner was replaced in 2013, and the roof was replaced in 2024. Sediment was ¼ to 1.5 inches during 2018 cleaning.

R02 – Decoto Reservoir was built in 1964 and is located at 35006 Mission Blvd in Fremont. The reservoir liner is original. Depth of sediment in this reservoir in 2016 averaged about 1 in most places, and up to 6- 8 inches on sloped walls.

R03 – Whitfield Reservoir was built in 1985 and is located at 42650 Paseo Padre Pkwy in Fremont. The reservoir serves as a clearwell for Water Treatment Plant No. 2. Sediment was light from dusting to about 1-inch in heavier area.

R04 – Mayhew Reservoir was built in 1963 and is located at 44122 Hunter Terrace in Fremont. The reservoir liner was replaced in 2014. The reservoir roof was replaced 2014.

R05 – Middlefield Reservoir was built in 1958 and is located at 3002 Middlefield Ave in Fremont. The reservoir liner is sprayed polyuria lining over non-woven geotextile fabric and was installed in 2002.

Previous inspections have identified blistering defects in the polyuria liner and failure of the roof’s structural steel coating. Paint chips from the roof’s coating are expected to be found floating on the water surface and scattered throughout the reservoir bottom.

R06 – Patterson Reservoir was built in 1962 and is located at 7515 Paseo Padre Pkwy in Fremont. The liner was replaced in 2006. Sediment during the 2016 cleaning ranged from ¼ inch to 6 inches. The sloped walls had the most accumulated sediment.

Table C.1 List of ACWD Potable Water Tanks.

Facility Name Capacity Dimensions (D x H)

Overflow Level

Water Operating Level

No.

Columns

Coating/Liner Last Cleaned

Major Known Deficiencies

Appian Tank 0.75 MG 75 Ft × 28 Ft 23.5 Ft 16 – 21 Ft 1 Epoxy 02/2022 None

Canyon Heights Tank 0.48 MG 54 Ft × 32 Ft 29.6 Ft 18 – 27 Ft 1 Epoxy 05/2020 None

Hidden Valley Tank 2.0 MG 120 Ft × 24 Ft 23.6 Ft 12 – 24 Ft 8 Thioxtropic Coal Tar 03/2025 Heavy Corrosion

Vineyard Heights Tank 0.54 MG 60 Ft × 27 Ft 25.6 Ft 14 – 24 Ft 1 Thin Film Epoxy 02/2022 None

MSJ Treated Water Tank 0.75 MG 90 Ft × 22 Ft 19.5 Ft 6 – 16 Ft 1 Coal Tar 12/2020 Heavy Corrosion

Ohlone Tank 1.43 MG 90 Ft × 33 Ft 31.7 Ft 24 – 29 Ft 7 Polyamide Epoxy 11/2019 None

Avalon Tank 2.75 MG 120 Ft × 33 Ft 32 Ft 11 – 24 Ft 9 Epoxy 04/2024 None

Table C.2 List of ACWD Potable Water Reservoirs.

Facility Name

Capacity Dimensions (L X W)

Area, sq.ft of liner

Overflow Level

Water Operating

Level

No.

Columns

Coating/Liner Last Cleaned

Major Known Deficiencies

Alameda Reservoir

16.3 MG 402 Ft × 354 Ft 148,500 28.5 Ft 15 – 25 Ft 95 Chlorosulfonated Polyethylene

Geomembrane

11/2024 None

Decoto Reservoir

14.5 MG 410 Ft × 270 Ft 117,000 29.8 Ft 8 – 18 Ft 64 Ethylene Propylene Diene Monomer (EPDM) Rubber

11/2021 Liner Installed

Whitfield Reservoir

20.6 MG 333 Ft × 313 Ft 105,700* 30 Ft 22 – 27 Ft 228 Concrete 04/2024 None

Mayhew Reservoir

4.6 MG 228 Ft × 228 Ft 57,000 20.8 Ft 15 – 20 Ft 36 Polyurethane over nonwoven geotextile fabric

01/2025 None

Middlefield Reservoir

7.1 MG 296 Ft × 240 Ft 70,300 20.5 Ft 18 – 27 Ft 53 Polyurea over nonwoven geotextile fabric

11/2020 Failing liner and failing roof coating

Patterson Reservoir

14.2 MG 446 Ft × 240 Ft 110,200 29.8 Ft 20 – 28 Ft 79 Polyurethane over nonwoven geotextile fabric

04/2020 None

*Floor footage only, does not include wall square footage