799-10887-1240 Addendum 1.pdf

Addendum Number: 1

Date of Issuance: February 5, 2025

Project: WATER TANK RECOATING AND REPAIRS

FLUVANNA CORRECTIONAL CENTER

Project Code: 799-10887-1240

Owner: Virginia Department of Corrections

The following items represent changes, modifications and/or clarifications to the Contract Documents for this project. This Addendum shall become a part of the Contract Documents and all bidders shall include its provisions in their proposals. Receipt of this Addendum shall be acknowledged on the Bid Form where designated.

This Addendum consists of the following:

5- Typed Addendum Pages

2- Drawing Sketch Pages

1- Prebid Attendees List Page

Pre-Bid Meeting:

Refer to the attached Attendees List for the mandatory pre-bid meeting held on 2/3/2025 at the site.

Questions:

Question 1: What do we do with the existing cathodic protection system, and is it our responsibility to dispose of it, if it will be replaced.

Response: The existing cathodic protection system shall be removed and a new cathodic protection system shall be provided in accordance with the specifications and sketches shown herein.

Question 2: Does the facility have a local lab they work for the bac-t sample testing and is the contractor paying for the testing.

Response: No. The contractor shall contract with a laboratory that is certified by the Virginia

Department of Health (VDH) for disinfection testing.

Question 3: Is the tank getting a logo.

Response: No logo.

Question 4: Is the existing piping and valves in the pump house getting painted?

2/4/2025

Response: No. The contractor shall paint new piping with 2 coats of light blue epoxy paint to match the existing piping.

Question 5: Does the existing tank have lead coatings?

Response: No. The existing tank coatings have been tested and do not contain lead.

Question 6: Does the tank need to be covered during blasting and painting operations?

Response: Yes. The tank shall be shrouded with a protective curtain covering to prevent debris from entering the adjacent water pond and correctional facilities.

Changes to the Project Manual:

Add the following specifications:

SECTION 221113 - WATER PIPING AND VALVES

A. Indicator Posts: UL 789, FM Global approved, vertical-type, cast-iron body with operating wrench, extension rod, and adjustable cast-iron barrel of length required for depth of burial of valve. Provide with supervisory switches, single pole, double throw (SPDT); designed to signal valve in other than fully open position.

B. Remove existing valve indicator posts and provide a wiring and conduit connection to the existing fire alarm panel by a certified fire protection system company.

SECTION 221114 TANK DISINFECTION

A. The tank shall be satisfactorily disinfected in accordance with AWWA C652, Chlorination Method Numbers 2 or 3. The chlorination shall conform to the Virginia

Department of Health (VDH) "Waterworks Regulations" prior to being placed in operation. The disinfection of the tank shall be repeated until it is determined, by bacteriological testing, that the water is free of bacteria. Only potable water shall be used for initial cleaning of the storage tank.

B. Testing of the water following disinfection:

1. All chlorine residual determinations shall be made using only those methods approved by the Virginia Department of Health (VDH).

2. Two water samples for bacteriological analysis shall be collected at least 24 hours apart and analyzed by a VDH certified laboratory. The results of these samples must indicate no contamination before the tanks can be placed into service. If contamination is detected, the disinfection procedure shall be repeated.

3. Once the bacteriological testing is successfully completed, the tank shall be placed in service.

SECTION 264215 CATHODIC PROTECTION SYSTEM

The water tank shall be provided with a digitally controlled Modular Automatic Cathodic

Protection Unit (MACPU® Digital) and submerged floating anode system manufactured by

Freeman Industries, Inc. or approved equal. The purpose of the system shall be to automatically control corrosion of the submerged interior surfaces of the water tank. Design cathodic protection system to provide and maintain tank-to-water potentials of -900 mV with respect to a

Cu/CuSO4 reference cell. The reference set point potential of the rectifier unit(s) shall be capable of adjustment from -850 mV to -1050 mV. The reference cell potential shall be monitored free of IR drop. Total bare surface area to be protected shall be 100% of the submerged interior tank surfaces with a coating efficiency of 75%. Minimum design current density shall be 1 ma / sq. ft. of the bare surface area.

A. MACPU® Digital Automatic Cathodic Protection Unit:

1. General:

The automatic cathodic protection unit shall be a digitally controlled

Modular Automatic Cathodic Protection Unit (MACPU® Digital) manufactured by Freeman Industries, Inc., and shall contain the necessary

DC power supplies, digital screen displays, digital controller, circuit breakers, wiring, etc., to afford adequate cathodic protection to protect the structure. It shall be designed for 60 Hertz, 120 volt, single phase operation.

2. Enclosure:

The (MACPU® Digital) shall be housed in a NEMA 4X stainless steel enclosure and have a provision for locking. It should be designed to contain up to four independently controlled DC circuits.

3. Screen Display

System monitoring shall utilize a multiple line screen display and be capable of monitoring anode current, anode voltage, reference cell voltage, and reference voltage for up to four independently controlled DC power circuits.

4. Digital Controller:

The Digital Rectifier Controller shall be able to monitor 4 or more reference cell inputs free of IR drop error, and control up to 4 independent DC output circuits.

5. Overload and Short Circuit Protection:

The control unit should be designed to protect when short circuit conditions occur and prevent overloading of system components during normal operation.

B. Submerged Floating Anode System:

1. Bowl Submerged Floating Anode System

The submerged floating anode system shall be designed for a minimum life of 20 years and shall be securely attached to the tank to prevent damage from ice conditions. The anode system shall consist of platinized niobium wire anodes with a minimum diameter of 0.062 in. with a minimum of 25 micro-inch of platinum. The anodes shall be attached to a buoyant submerged structure suspended to the interior tank walls or floor by flexible attachments, preferably 5/16 in. polyester rope. Welding of anode mounting anchors will be 1/8 in. filet welded all around.

2. Wet Riser Anode System:

The wet riser anode (if applicable) shall consist of a vertically suspended platinized niobium wire anode attached to a 5/16 in. polyester support rope. The anode shall be secured to the support rope every 10 ft. minimum or as necessary. The anode shall be secured at the top and bottom to eliminate the anode coming in contact with the interior walls of the wet riser. The anode shall be designed for uniform distribution of current.

Welding of anode mounting anchors will be 1/8 in. filet welded all around.

3. Anode and Reference Electrode Lead Wires Entrance Fitting:

a. Anode and Reference Electrode lead wires shall enter the tank below the minimum water level through pressure tight fittings. The pressure entrance coupling shall be a maximum size of 1-1/2 inches with a minimum rating of 3000 lb. Welding of the pressure entrance coupling will be completed by a certified welder.

C. Reference Electrodes

1. Reference Electrodes:

Each independent rectifier circuit shall utilize a Cu-CuSO4 half-cell reference electrode designed with a minimum ten year life for monitoring the submerged steel potentials.

D. Criteria for Cathodic Protection: After the system has been set into operation by an authorized manufacturer’s representative, complete potential tests will be performed to confirm that protection is being achieved in conformance with criteria established by the National Association of Corrosion Engineers in the NACE

Standard Practice SP0388-2014.

E. Guarantee: The cathodic Protection System shall be guaranteed against all defects in materials and workmanship for a period of one year.

F. Service Contract: The proper operation of cathodic protection systems depends on adequate periodic maintenance and testing. As an additional submittal the bidder shall supply an annual service contract to cover all maintenance requirements for the installed system. The contract shall provide for the following:

1. Inspection and adjustment of the equipment once per year during the period covered by the proposal.

2. Complete maintenance of the equipment by furnishing all labor and equipment to replace or repair, all parts worn or damaged so as to impair the operation of the system, except those parts damaged through war, fire, Acts of God, negligence, tampering or other fault of the purchaser.

G. Testing of the Cathodic Protection System:

1. The cathodic protection shall be left off for the paint warranty period, therefore it shall be temporarily put into operation and tested by experienced personnel of the manufacturer to determine that it does provide protection in accordance with NACE Standard Practice SP0388-2014, and then it shall be turned off for the paint warranty period.

2. After the warranty period of the cathodic protection system, it shall be tested by experienced personnel` of the manufacturer to determine that it does provide protection in accordance with NACE Standard Practice SP0388-2014.

H. Training of Personnel: A representative of the manufacturer shall train personnel on the operation and monitoring of the cathodic protection system, which shall include recording rectifier parameters for the manufacturer’s review, so that continued protection is assured.

Changes to the Drawings:

Add the following sketches:

CATHODIC PROTECTION MOUNTING DETAILS

TANK REPAIRS: Include in the base bid the following quantities of repairs; quantities that are more than listed shall be provided by a separate change order.

Item Quantity

ROOF PLATE SEAL WELD 50 linear feet

PIT OR ANOMALY SEAL WELD 30 locations

PATCH PLATE 10 locations

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THIS DETAIL APPLIES TO PITS AND ANOMALIES

THAT ARE GREATER THAN 1" ACROSS, LESS THAN

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3/16"

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SEAL WELD ALL INTERIOR LAP

JOINTS

SCALE: NONE

PIT OR ANOMALY SEAL WELD

SEAL WELD AND

GRIND SMOOTH 3/16"

THIS DETAIL APPLIES TO PITS AND

ANOMALIES THAT ARE LESS THAN 1"

ACROSS AND LESS THAN 3/32" DEEP, FOR

ALL OTHERS PROVIDE AN 8"Øx1/4" PATCH

PLATE BELOW

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