2024-01-03 - Addendum 2 - Ruthville WWTP Replacement.pdf

263 McLaws Circle, Suite 205, Williamsburg, Virginia 23185

P: 757.229.1776 | F: 757.229.4683 bowman.com

ADDENDUM NO. 2

DATE: JANUARY 3, 2024

CHARLES CITY COUNTY

RUTHVILLE WWTP REPLACEMENT

GENERAL INFORMATION:

1. Contractor will acknowledge receipt of this addendum in the bid form.

PROJECT MANUAL:

TABLE OF CONTENTS

2. On Page TOC-2, after Technical Specification Section 013825: Instruments and

Control Equipment, add the following.

“Division 15 Mechanical Section 15425: Heating and Ventilation Equipment…. 15425-1”

TECHNICAL SPECIFICATION SECTION 02564

3. Delete Section 02564-2.04 in its entirety and replace it with the following.

“2.04 WATER LINE PIPING AND APPURTENANCES

A. Water piping shall be HDPE as specified on Sheet 08A of the Contract Drawings.

B. Yard hydrants shall be Simmons or equal. Yard Hydrants shall be frost-proof and backflow protected. Hydrant shall be lockable, self-draining, and provided with hose adapters.

C. A Reduced Pressure Zone assembly shall be installed inside the control building to prevent backflow due to back siphonage and/or back pressure.

1. The assembly shall consist of an internal pressure differential relief valve located in a zone between two positive seating check modules with captured springs and silicone seat discs.

2. Seats and seat discs shall be replaceable in both check modules and the relief valve. There shall be no threads or screws in the waterway exposed to line fluids.

1/3/2024

3. The assembly shall also include two resilient seated isolation valves, four resilient seated test cocks, and an air gap drain fitting.

4. The assembly shall meet the requirements of USC; ASSE Std. 1013;

AWWA Std. C511-92; CSA B64.4.

5. The assembly shall be installed a minimum of 12-inches above the finished floor elevation.

6. The RPZ shall be a Watts® Series 009 or engineer approved equal and shall include a sensor on the relief valve for flood detection.”

TECHNICAL SPECIFICATION SECTION 11400

4. Delete the statement “The contractor shall take all necessary precaution as required to prevent floatation of the treatment plant” from section 3.01-E.

TECHNICAL SPECIFICATION SECTION 16050

5. Add the following to Specification Section 3.04-C.

“Compression Style Fittings in lieu of welding is an approved equal.”

CONTRACT DRAWINGS:

SHEET C-1

6. Add the following note 4 after note 3 of the Notes.

“4. PROPANE TANKS SHALL BE SUPPLIED BY THE COUNTY PROPANE VENDOR.

CONTRACTOR SHALL COORDINATE WITH THE COUNTY AND VENDOR FOR

INSTALLATION. CONNECTION DETAILS TO BE FURNISHED BY PROPANE VENDOR,

CONTRACTOR SHALL COORDINATE WITH PROPANE VENDOR FOR CONNECTION

DETAILS. CONTRACTOR SHALL BE RESPONSIBLE FOR FURNISHING AND

INSTALLING THE FUEL PIPE BETWEEN THE PROPANE TANK AND THE

GENERATOR.”

SHEET C-2

7. Add the following note 7 after note 6 of the Demolition Notes.

“7. SAND FILTER MEDIA (INCLUDING SOLIDS) IN THE EXISTING WWTP SHALL BE

TRANSPORTED AND DISPOSED OF IN A LAWFUL MANNER, THE DEPTH OF THE

SAND IS APPROXIMATELY 30 INCHES AND THE DIAMETER IS 50-FEET.

SHEET M-1

8. Remove callout “30”x25” REMOVABLE ALUMINUM GRATE” on WWTP PLAN in its entirety and replace it with the following.

“30”X25” REMOVABLE FRP GRATE”

9. Remove note 3 in its entirety and replace it with the following.

“3. PACKAGED TREATMENT TANK PIPE FREEZE PROTECTION, SHALL BE BY

CONTRACTOR. FREEZE PROTECTION FOR PACKAGED TREATMENT TANK PIPING

SHALL BE PER TECHNICAL SPECIFICATION SECTION 11400-2.01-B. FREEZE

PROTECTION FOR ALL OTHER ABOVE GROUND PIPING (NORMALLY FULL) SHALL

BE INSULATED WITH ALUMINUM JACKET AND HEAT TRACE. HEAT TRACE AND

INSULATION SHALL START 2.5’ BELOW GROUND.”

10. Update Sheet M-1 as indicated in the image below.

SHEET S-2

11. Delete Callout “RT 4 x 4 x #0.25” on Section A in its entirety and replace it with the following.

“STRUCTURAL ALUMINUM RT 4 x 4 x #0.25”

SHEET E-3

12. Delete Callout “CABLE AND CONDUIT PER MANUFACTURER, PROVIDE 316 SS

CONDUIT FROM TANK TO J-BOX” on the ONE-LINE DIAGRAM its entirety and replace it with the following.

“CABLE AND CONDUIT PER PACKAGE PLANT MANUFACTURER, PROVIDE

CONDUIT 316 SS CONDUIT FROM TANK TO J-BOX”

BIDDER QUESTIONS AND ANSWERS

13. Please confirm that all known work: piping, valves, electrical wiring, and structural work is shown on the contract drawings to provide a complete system and the contractor will not be required to provide anything that is not shown on the drawings as this is an owner purchased system

Response: The Fluidyne Package Plant system and Accudose Wireless

Monitoring System are the only county purchased materials as outlined on the Contract Documents.

14. Reference Page 7 section 4.1 & Page 11 section 5.1.2 of the Geotech report.

Should the contractor include any undercutting in our base bid? If so can a quantity be provided for bidding purposes?

Response: Undercutting is not required. Generally, the soils are good, and footings would extend through any FILL/ soft soils encountered (within the top 24-inches).

ATTACHMENTS:

APPENDIX A: Technical Specification Section 15425 Heating and Ventilation Equipment

END OF ADDENDUM NO. 2

Appendix A: Technical Specification Section 15425 Heating and Ventilation

Equipment

Heating and Ventilation Equipment Ruthville Wastewater Treatment Plant Replacement Section 15425 Bowman Project No. 008141-01-013

15425-1

SECTION 15425

HEATING AND VENTILATION EQUIPMENT

PART 1 – GENERAL

1.01 SUMMARY

This section specifies the requirements of the heating and ventilation equipment in the Control building.

1.02 SUBMITTALS

Digital copy of complete operations manual for all equipment, including detail drawings, maintenance instructions and other pertinent data shall be compiled and submitted to the Engineer for review and approval before acceptance of the facility.

PART 2 – PRODUCTS

2.01 EXHAUST FAN

A. Ventilation fan shall be provided for the building. Fan shall be 10” direct drive with a 120 Volt motor capable of providing a minimum of 150 cfm.

B. Fan casings shall be ½” thick steel wall collar with outer diameter of 17”.

C. Wall penetration shall be as shown on Contract Drawings.

D. Provide gravity operated louvers with Stainless Steel Insect Screen.

2.02 UNIT HEATER

A. Unit heater shall be 5 kW, 240 V, single phase heater for the control building.

B. Heater shall include the following features: integral thermostat and ceiling or wall mounting bracket. If integral thermostat is not available, provide external thermostat to match unit requirements. Manufacturer shall be McMaster-Carr or engineer approved equal.

C. Location of the unit heater is shown on the drawings.

D. The heater should maintain a constant temperature of 55 degree Fahrenheit.

Heating and Ventilation Equipment Ruthville Wastewater Treatment Plant Replacement Section 15425 Bowman Project No. 008141-01-013

15425-2

PART 3 - EXECUTION

3.01 INSTALLATION

Installation of all equipment shall be accomplished in accordance with contract drawings and the equipment manufacturer’s recommendations. Equipment must be properly aligned and anchored to prevent movement or undue stress or associated components or adjacent equipment.

END OF SECTION