Addendum No 1.pdf

T.B.P.E. Firm No. F-13162 Page 1 of 1

ADDENDUM NO. 1

CITY OF HEARNE

SAN ANTONIO WATER PUMPING STATION REHABILITATION

CDBG-MIT CONTRACT NO. 24-065-074-E685

DATE OF ADDENDUM: MAY 26, 2026

BID OPENING DATE: THURSDAY JUNE 4, 2026, AT 2:00 PM

This Addendum forms a part of the Contract and clarifies, corrects or modifies original Bid Documents, dated

May 2026. Acknowledge receipt of this addendum in the space provided on the Bid Form. Failure to do so may subject Bidder to disqualification.

Specifications:

1. Section 11201, CHLORINATION EQUIPMENT (CHLORINE GAS), remove and replace in its entirety with the attached.

5/26/2026

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SECTION 11201 1

CHLORINATION EQUIPMENT (CHLORINE GAS) 2

PART 1 - GENERAL 3

1.01 DESCRIPTION 4

A. This Section specifies the design, construction and installation of a chlorination system for 5 disinfecting water. Provide three (3) manual chlorinators, one (1) dual cylinder chlorine scale, leak 6 detection equipment, self contained breathing apparatus, fiberglass building, and all valves, piping, 7 wiring, and miscellaneous items required to provide a complete and properly operating system in 8 accordance with the Contract Documents. 9

1.02 SUBMITTALS 10

A. Provide shop drawings and product data, including schematic piping and detailed installation 11 instructions and drawings. 12

B. Operation and Maintenance Data: Submit operation and maintenance data which as a minimum 13 contains the following information: 14

1. Description of Equipment 15

2. Assembly/Disassembly Drawings 16

3. Materials List 17

4. Normal Start-up/Shut-Down Procedures 18

5. Emergency Procedures 19

6. Maintenance Schedule 20

7. Trouble-shooting Guide 21

8. Data shall also include name, address and telephone number of local manufacturer's 22 representative. 23

9. Contractor shall submit five bound copies to Owner upon approval of shop drawings. 24

1.03 QUALITY ASSURANCE 25

A. Provide all specified equipment of the latest and most modern design guaranteed by the 26 manufacturer to meet the performance requirements as specified herein. 27

B. Provide a qualified technical representative of the manufacturer to inspect the completed equipment 28 installation, make all the adjustments necessary to place the equipment in trouble-free operation and 29 to instruct operation personnel in the proper care and operation by the manufacturer. 30

1.04 ACCEPTABLE MANUFACTURERS 31

A. Provide equipment as supplied by an acceptable manufacturer from those listed in the Bid Form, 32

Section 00301 of the Contract Documents. 33

PART 2- PRODUCTS 34

2.01 CHLORINATORS 35

A. Provide three manually controlled chlorinator(s) with a remote vacuum arrangement. Provide wall 36 mounted units with 50 pound per day rotameters. 37

B. Construct the chlorinators entirely of materials resistant to the corrosive attack of chlorine gas and 38 containing the following control and safety components: 39

1. Standby pressure relief valve 40

2. Rate valve for local manual control of chlorine dosage 41

C. Each chlorinator to have a 50 lb. per day maximum capacity. 42

D. Gas metered under vacuum created by ¾ inch injector located near each feeder. Injector sized to 43 operate against a back pressure of 10 psig at point of injection, at 20 gpm and supply pressure of 60 44 psig. 45

2.02 ACCESSORY EQUIPMENT 46

A. Provide and install all required Schedule 80 PVC chlorination piping, fitting and valves for a 47 complete operating system. 48

B. Provide and install all required ½ inch and ¾ inch tubing, fittings and valves for a complete 49 operating system. 50

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C. Provide stainless steel chains for spare and empty cylinders with Grinnel cadmium plated clamps 1 and hangers as required. 2

D. Provide scale designed to independently weigh two compressed gas cylinders including non-3 metallic base, restraining chains and digital readouts. Net weight shall be adjustable through tare 4 weight adjustment knobs. The scale shall be capable of handling cylinders 11-¼ inch or less in 5 diameter, having a gross weight of 300 pounds or less. Scale shall have two contacts (min) capable 6 of being tied to the autodialer to indicate low chlorine supply. 7

E. Provide ammonia solution and equipment for detecting chlorine leaks. 8

F. Provide cylinder mounted vacuum regulators and automatic vacuum regulator switchover module 9

(standby, in use and empty indicator on front panel) where indicated on the Drawings. 10

2.03 SELF CONTAINED BREATHING APPARATUS 12

A. Provide one self contained breathing apparatus (to be mounted inside the San Antonio Pumping 13

Station CMU building where shown on the plans) including: 14

1. 30 minutes air supply 15

2. Full face mask 16

3. Wall mounted case 17

4. Low air audible alarm 18

5. Unit shall be a MSA workmate or approved equal. 19

2.04 LEAK DETECTION EQUIPMENT 20

A. Provide a leak detector unit capable of receiving signals from six leak sensors. If more than one 21 leak sensor can be connected to the same contact, then a four contacts leak detector unit is 22 acceptable. The leak detector unit must be capable of sending two separate signals to the automatic 23 telephone dialer including the following: 24

1. Low level chlorine leak 25

2. High level chlorine leak 26

B. Leak detection unit must be equipped with both a visual and an audible alarm. 27

C. Alarms must be non-latching type. 28

D. Mount leak detection unit(s) in a minimum NEMA 3R corrosion resistant enclosure. 29

E. The following leak sensors must be provided: 30

Type Alarm Setpoint Location

Low Chlorine Alarm 2 ppm Chlorine Feeder Room

Low Chlorine Alarm 2 ppm Chlorine Cylinder Room

High Chlorine Alarm 20 ppm Chlorine Feeder Room

High Chlorine Alarm 20 ppm Chlorine Cylinder Room

1. Leak sensors must have a minimum 2 year life with the exception of a major leak in which the 31 sensor will be replaced no matter what age. 32

2. Locate the sensors as shown on the Drawings. 33

3. Provide weather resistant sensors that may be located outdoors. 34

4. Provide plug-in type sensors that are easily replaced without pulling new wire. 35

2.05 FIBERGLASS BUILDING 36

A. Provide one prefabricated one-piece molded, two-compartment, fiberglass shelter with the following 37 features: 38

1. Each unit to be minimum 4 feet by 8 feet. 39

2. Sloping roof (1 inch vertical per foot horizontal) peak at center. 40

3. Designed to withstand 125 mph wind load. 41

4. Provide removable lifting eyes in roof. 42

5. Provide 36 inch by 76 inch door typical to fiberglass construction for each compartment. Door 43 to be equipped with panic hardware. Door gasket to be neoprene rubber. 44

6. Provide stainless steel, two point, padlockable locking latch for each door. 45

7. Provide one (min.) 12 inch by 12 inch safety glass in one door of chlorine cylinder room and 46 one door of chlorine feeder room. 47

8. Provide "DANGER" sign on door indicating type of gas present. 48

9. Provide two exhaust fan for each compartment (one blowing in and one blowing out) 49

10. Provide 1500 watt heater with thermostat for each compartment. 50

11. Provide vaportite LED light in each compartment. 51

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12. Provide duplex two toggle switchbox on outside of shelter adjacent to each door, one switch for 1 lighting and the other for the fan. 2

13. Provide duplex weatherproof 120 volt electrical outlet in each compartment. 3

14. Electrical wiring to be installed in rigid schedule 40 PVC conduit, except that flexible, liquid 4 tight PVC conduit may be used for final tie-in at each piece of equipment. 5

15. Provide neoprene rubber gasket between floor flange and concrete slab. Bolt to slab with 1/4 6 inch expansion anchors at 24 inch centers maximum. 7

16. Provide interior gas-tight partition wall dividing shelter into two compartments with 8 dimensions as shown on the Drawings. 9

PART 3 - EXECUTION 10

3.01 INSTALLATION 11

A. Install all equipment and connecting piping in accordance with manufacturer's instructions. Prior to 12 testing and start-up, inspect to verify the system is complete. 13

B. No form of energy shall be turned on to any part of the system prior to approval of factory 14 authorized service representative. 15

C. Clean all new piping prior to testing. 16

D. After installation, and in the presence of the Engineer, test all pipelines for tightness in acceptable 17 manner. Furnish suitable testing plugs or caps, all necessary pipe connections, test fluids, gauges or 18 other equipment and all labor required. 19

E. Remove or valve off from lines all instrumentation and appurtenant equipment which is not capable 20 of withstanding the test pressures. 21

F. Pressurize chlorine supply system to 150 psig with dry air or nitrogen and test for leaks by 22 application of soapy water to outside of all joints, After pressure testing all piping, gradually 23 introduce chlorine gas and test the system for leaks as described below. 24

G. Test for chlorine leaks with commercial 26 degree Baume Ammonia. 25

H. After installation of equipment in the presence of the Engineer, operate each unit to demonstrate it's 26 ability to operate without leakage and to perform its specified functions satisfactorily. 27

3.02 WARRANTY 28

A. For a period of 12 months from final acceptance, the manufacturer shall warrant that the equipment 29 shall be free of defects in material and workmanship under normal use and service, and when 30 properly installed. The manufacturer shall repair or replace, F.O.B. point of shipment, such 31 equipment or any part thereof furnished by the manufacturer and found defective after inspection by 32 the manufacturer. 33

END OF SECTION 34