addendum no. 3 - mcghee engineering

McGhee Engineering, Inc.

City of Auburn, Kentucky Wastewater Treatment Plant Expansion

ADDENDUM No. 3

April 9, 2020

This ADDENDUM to plans, specifications and bidding documents for the subject project modifies the referenced items to the extent described herein. Items not modified by this ADDENDUM remain unchanged and in full effect. Bidders are required to acknowledge receipt of this ADDENDUM on the Bid Form. General Conditions

1. 13.02 – Allowances provided for are contingency allowances. Allowances are to be used only with the advance approval of the Owner and Engineer. Unused allowance funds will be deducted from the Contract and retained by the Owner.

Bid Form

1. Sheet 4 of 5 – Replace with attached sheet.

Specifications

1. Metal Fabrications - Section 05 50 00

a. 1.01,A,1 - of 8 - DELETE: “and weir and baffle”. b. 2.06,C - Page 5 of 8 - DELETE: entire paragraph 2.06 C. c. 3.03,D - Page 7 of 8 - DELETE: entire paragraph 3.03 D. d. 3.07,G - Page 8 of 8 - DELETE: entire paragraph 3.07 G.

2. Fiberglass Weirs and Baffles - Section 06 61 14 a. ADD: attached specification section 06 61 14 (2 pages)

3. Submersible Pumps - Section 22 13 29 a. ADD: attached specification section 22 13 29 (4 pages)

4. Control and Instrumentation - Section 26 09 00

a. 2.22 ADD: the following:

2.22 Fiber-to-Copper Converters


A. Fiber-to-copper converters shall be an unmanaged network switch as manufactured by Hirschman, Spider III series, or equal, and shall include a fiber SFP port and a copper port. Fiber-to-copper converter shall be powered from existing 24VDC power supply.

b. 3.01,A,4 ADD: the following to the end of the paragraph: “Where necessary for the installed conditions, including direct sunlight

environments, motor control panel shall be provided with louvers and filtered forced-air cooling as required to maintain internal ambient air temperatures 10⁰F below the rated operating temperature of all internal control panel equipment. Where the forced-air cooling does not adequately maintain ambient air temperatures inside the control panel, provide air conditioning equipment.”

c. 3.05,A,2,c,(4) CLARIFICATION: change paragraph number to 3.05,B.

5. Influent Fine Screening System - Section 46 21 11 a. 2.03 - of 11 CHANGE: Screen NFPA Classification Requirement from

“Class I, Div. 1, Groups C & D” to “Class I, Div. 2, Groups C & D.”

6. Oxidation Ditch Aeration and Mixing Systems - Section 46 53 61 a. 2.12,D,2 - Page 14 of 22 - REPLACE: a “NEMA 12, freestanding, enclosure”

with “three NEMA 12, freestanding enclosures”. b. 2.12,D,2 - Page 14 of 22 - ADD: the following after the first sentence:

“The three enclosures shall be the Oxidation Ditch PLC Control Panel, the Basin No. 1 Motor Control Panel, and the Basin No. 2 Motor Control Panel. The Oxidation Ditch PLC Control Panel shall include the PLC, UPS, OIP, and all associated networking equipment indicated below. The Basin No. 1 Motor Control Panel shall include the motor control equipment for MIX-30-01, MIX-30-02, ODE-30-01, MOV-30-01, MOV-30-02, and MOV-30-03. The Basin No. 2 Motor Control Panel shall include the motor control equipment for MIX-30-03, MIX-30-04, ODE-30-02, MOV-30-04, MOV-30-05, and MOV-30-06.”

c. 2.12,D,2,a - Page 14 of 22 - REPLACE: this entire paragraph with the following: “The Oxidation Ditch PLC Control Panel shall include a 20-amp, single-pole,

120-volt main circuit breaker. Both the Basin No. 1 Motor Control Panel and Basin No. 2 Motor Control Panel shall each include a 125-amp, 3-pole, 480-volt, three-phase main circuit breaker with door-interlocked, padlockable handle.”

d. Oxidation Ditch Aeration and Mixing Systems I/O Listing - REPLACE: the I/O listing with the attached I/O List.

7. General Plumbing Piping Specialties - Section 22 06 19

e. 2.07,A,1 - Page 4 of 4 - ADD: the following paragraph B after paragraph A.

“B. Backflow Preventers (Drawing 05-C-08)

1. Reduced Pressure Zone (RPZ) Type:


a. Manufacturers: Watts, or equal. b. The assembly shall meet the requirements of ASSE 1013, AWWA C511. c. The assembly shall consist of a pressure differential relief valve located in a

zone between two positive seating check valves and captured springs. Back siphonage protection shall include provision to admit air directly into the reduced pressure zone via a separate channel from the water discharge channel. The assembly shall include two tightly closing shutoff valves before and after the valve and test cocks.

d. Test cocks. e. Seats: Bronze, removable and replaceable, without removing valve from the

line. f. Checks: Independently operating. g. Relief Valve: Independently operating, located between the two check

valves. h. Rated 175 psi maximum working pressure with continuous temperature

range of 33°F to 140°F. i. Unit to be complete with vent-port funnel to maintain the air gap and to

provide a drain connection point. j. Sizes 3 inches through 10 inches: FDA epoxy-coated cast iron body,

FDA epoxy-coated strainer, upstream and downstream OSY-UL/FM outside stem and yoke resilient seated gate valves, flange connections: Watts Regulator Series LF-909.”

8. Piping and Appurtenance - Section 40 23 10

a. 2.02,A 7- Page 2 of 22 - REPLACE: “No compact fittings are allowed” with

“Compact fittings are acceptable”. b. 2.02,A 9- Page 2 of 22 - DELETE: the sentence “Preparation and painting

shall conform to all requirements and provisions specified in Division 09”.

9. Peracetic Acid Storage and Feed Equipment - Section 43 32 68 a. 2.08,G - Page 6 of 7 - ADD: the following paragraph H after paragraph G. “H. Provide a wall mount emergency eyewash station in PAA building. The

eyewash station shall be Honeywell Fendall Pure Flow 1000®, or equal.” b. 2.09 - Page 6 of 7 - ADD: the following paragraph 2.09 “2.09. Provide PAA resistant apron, face shield and gloves (2 pair).”

10. Section 33 30 10

a. 2.03. 4 & 5 and 3.02 – All buried ductile iron pipe except for gravity lines, and the PVC influent force main and surge return line shall be restrained at bends and fittings in accordance with 3.01.2. Restraining glands (Mega-Lug or equal) are acceptable for such restraint.

b. PVC gravity sewer shall be SDR 35


c. 2.03. – Tracer wire is required on all buried plastic chemical feed, natural gas, and influent sewer piping. Other buried plastic pipe does not require tracer wire.

d. 2.06. – Trench drains shall be 8-inch polymer concrete with ductile iron grate suitable for HS-20 loading equal to Acodrain S200K.

11. Section 46 53 61

a. 3.08. B. – Water for testing of the oxidation ditch and other newly constructed basins is to be treated effluent diverted from the existing plant via pumping or temporary piping into the new influent lift station then to the new plant. The use of potable water for testing is not anticipated but may be used at the Contractor’s option. If potable water is used, Contractor will be responsible for paying all costs associated with providing it.

12. Section 43 25 10

a. 3.02. A. Delete requirement for factory testing.

13. Add the following item of equipment to be provided and delivered to the City of Auburn.

a. 1 – Each diesel driven, trailer mounted, self-priming, solids handling pump. The unit shall be rated to pump a minimum of 1,200 GPM at 130 feet TDH at 2,200 RPM engine speed. The pump shall have 4-inch suction and discharge and shall be capable of passing a 3-inch sphere, drawing at least 25 feet of suction prime, and operating in harsh outdoor conditions continuously pumping raw sewage at the design flow and head. The engine shall be a final tier IV, minimum 40-HP, diesel fueled engine with 12-volt electric start, electronic governor, auto start/stop controls and float switches, and a maximum fuel consumption of 2.0 gallons per hour at design conditions. The unit shall be mounted on a DOT approved trailer with trailer lights, 100 gallon fuel tank, pintle hitch, safety chains, torsion suspension, central lifting bail, and hose storage. 25 feet of 4-inch suction hose and 40 feet of 4-inch discharge hose shall be provided with all necessary valves and fittings, including a suction strainer, plug valve, elbows, adapters, and connection fittings matching the quick-disconnect risers to be provided at the flow equalization basin. The unit shall be delivered with a full tank of fresh fuel, warrantied for one year from the date of delivery and shall include 4 hours of on-site training in its operation and maintenance. The pumping unit shall be as manufactured by Thompson Pump, Godwin, Gorman Rupp or approved equal.


Appendix

1. Appendix 5

a. Do not include the cost of railroad flagmen or inspectors as referred to in the license agreement in the bid. If such services are required by R.J. Corman Railroad, the Owner will pay such costs directly, or reimbursement at cost will be made to the contractor by change order or use of allowance funds.

Drawings

1. Influent Lift Station Electrical Plans a. Sheet 28 CHANGE: MCP-10 from 48-inches wide to 72-inches wide. MCP-10

pad shall change to accommodate MCP-10 enclosure size change.

2. RAS/WAS Pump Station Electrical Plan a. Sheet 48 ADD: a sump pump fixed equipment connection in the valve vault.

Sump pump shall be powered from LP-80.

3. PAA Disinfection System Section a. Sheet 51 ADD: Key note 2 to the effluent weir in section 4/60-ASM-03 with the

following information “Key note 2 - Top of concrete wall elevation for the effluent weir shall be at 628.25. See detail C/100-ASM-01 for installation requirements.”

b. Sheet 51 ADD: Key note 3 to the spill containment in section 6/60-ASM-03 with the following information “Key note 3 - Spill containment shall be PAK 736 poly IBC pallet with 360 gallons sump capacity”

4. Administration Building Electrical Plan a. Sheet 79 REPLACE: The Oxidation Ditch Control Panel with three 24” wide by

20” deep pad-mounted panels mounted adjacent to each other. The left panel shall be the “Oxidation Ditch PLC Control Panel”. The middle panel shall be the “Basin No. 1 Motor Control Panel”. The right panel shall be the “Basin No. 2 Motor Control Panel”. The concrete pad shall be provided under all three panels.

5. Electrical One-Line Diagrams

a. Sheet 90 DELETE: the 200-amp feeder circuit breaker in SWBD-85 for the

Oxidation Ditch Control Panel and associated conduit and wiring.


b. Sheet 90 ADD: a 125-amp, 3-pole feeder circuit breaker in SWBD-85 for 480V, three-phase power to Basin No. 1 Motor Control Panel. Provide 3~#1 and #6 ground in 1 1/2” conduit from SWBD-85 to Basin No. 1 Motor Control Panel.

c. Sheet 90 ADD: a 125-amp, 3-pole feeder circuit breaker in SWBD-85 for 480V, three-phase power to Basin No. 2 Motor Control Panel. Provide 3~#1 and #6 ground in 1 1/2” conduit from SWBD-85 to Basin No. 2 Motor Control Panel.

6. Telephone and SCADA Riser Diagrams

a. Sheet 91 CHANGE: the “Oxidation Ditch Control Panel” to “Oxidation Ditch

PLC Control Panel” on the SCADA Riser Diagram. b. Sheet 91 CLARIFICATION: ODE-30-01 VFD shall be located in the Basin No.

1 Motor Control Panel. c. Sheet 91 CLARIFICATION: ODE-30-02 VFD shall be located in the Basin No.

2 Motor Control Panel. d. Sheet 91 ADD: CAT6 shielded cables from the Oxidation Ditch PLC Control

Panel managed network switch to each of the four oxidation ditch mixers starter solid-state overload relays: MIX-30-01 and MIX-30-02 in Basin No. 1 Motor Control Panel and MIX-30-03 and MIX-30-04 in Basin No. 2 Motor Control Panel. Provide 1 1/2” conduit from the Basin No. 1 Motor Control Panel and the Basin No. 2 Motor Control Panel to the Oxidation Ditch PLC Control Panel for the mixer Ethernet cables.

e. Sheet 91 ADD: CAT6 shielded cables in 3/4” conduit from SCC-80 managed network switch to both RASP-50-01 VFD and RASP-50-02 VFD.

7. MCC-80 Schedule and Elevation a. Sheet 92 CHANGE: Both SLB-70-01 and SLB-70-02 from 1.5 space factor to

2 space factor. 8. Electrical SWBD-85 Elevation and Schedules - 1

a. Sheet 93 DELETE: the “Oxidation Ditch Control Panel FCB” on the SWBD-85

Elevation. b. Sheet 93 ADD: the “Basin No. 1 Motor Control Panel FCB” on the SWBD-85

Elevation. c. Sheet 93 ADD: the “Basin No. 2 Motor Control Panel FCB” on the SWBD-85

Elevation.

9. Electrical Schedules - 2 a. Sheet 94 REPLACE: The Oxidation Ditch Control Panel Conduit and Wiring

Schedule with the attached schedule. b. Sheet 94 ADD: a 20-amp, single-pole branch circuit breaker to Lighting Panel

LP-85 for 120-volt, single-phase power to the Oxidation Ditch PLC Control Panel.


c. Sheet 94 ADD: a 20-amp, single-pole branch circuit breaker to Lighting Panel LP-85 for 120-volt, single-phase power to the RAS/WAS valve vault sump pump.

10. Overall Final Clarifiers and RAS Pump Station Lower Plan a. Sheet 41 DELETE: reference to Section 3/40-ASM-03.

11. Dewatering Building Plumbing Plan

a. Sheet 65 REPLACE: sheet 65 drawing with attached drawing sheet 65R.

12. Sludge Dewatering Building Plumbing Schematic

a. Sheet 66 REPLACE: sheet 66 drawing with attached drawing sheet 66R.

13. Sheet 74/85-ASM-07

a. Specifications for the premanufactured mental awning are as follows:

Manufacturer: General Awnings Model: Mansard Awning Description: Standing Seam Galvalume 24 gauge Steel Panels, 1" square Aluminum Frame, Top Flashing per manufacturer's specifications., include Side Panels, Minimum 20 year warranty Approved equal substitutions shall be allowed and color to be selected by owner at a later date.

14. Sheet 71/85-ASM-04

a. Polished and sealed floor finish requirements are as follows: i. Diamond grind the floor with 100 grit to remove debris. ii. Fill the control joints with Hi-Tech PE-85 joint filler iii. Apply Ashford Formula Densifier per manufacturer's instructions to

dustproof, harden and seal the surface

b. Specifications for Ceramic Tile Floors are as follows: Manufacturer: DalTile Model: Volume 1.0 Color: TBD Size: 12 X 12 Finish: Matte Install per manufacturer's specifications. Approved equal substitutions shall be allowed and color to be selected by owner at a later date.


c. Specifications for Ceramic Tile Walls in Room 103 are as follows:

Manufacturer: DalTile Model: Volume 1.0 Color: TBD Size: 12 X 12 Finish: Matte Install per manufacturer's specifications. Approved equal substitutions shall be allowed and color to be selected by owner at a later date.

d. Specifications for metal siding for walls and ceiling in Room 106 are as follows:

Manufacturer: Semco Southeastern Metals Model: Corrugated Panel Finish: Galvanized Size: 4 X 8 Sheets Fastener Spacing: Field = 1'-4" o.c. max., Perimeter and Corners = 1'-0" o.c. max. Install per manufacturer's specifications. Approved equal substitutions shall be allowed.

15. Sheet 72/85-ASM-05

a. Specifications for metal siding for walls and ceiling in Room 106 are as follows:

Manufacturer: Semco Southeastern Metals Model: Corrugated Panel Finish: Galvanized Size: 4 X 8 Sheets Fastener Spacing: Field = 1'-4" o.c. max., Perimeter and Corners = 1'-0" o.c. max. Install per manufacturer's specifications. Approved equal substitutions shall be allowed.


16. Sheets 71/85-ASM-04 and 72/85-ASM-05

a. Ceiling Finish Clarification: Lab 101 = Suspended Acoustical Ceiling Tile Office 102 = Suspended Acoustical Ceiling Tile Toilet 103 = Suspended Acoustical Ceiling Tile Mechanical 104 = Open to structure Electrical 105 = Open to structure Maintenance 106 = Metal Corrugated Panel

b. Specifications for ceiling tile are as follows: Manufacturer: Certainteed Model: Versatone Color: White Vintage Size: 2 X 2

c. Specifications for ceiling track are as follows: Manufacturer: Certainteed Model: 15/16" EZ Stab Classic Aluminum Capped Color: Standard White

17. Sheet 75/85-ASM-08

a. Specifications for “damp-proofing” (noted in Detail 2) are as follows: Manufacturer: UGL Model: Drylok Extreme Masonry Waterproofer Install per manufacturer's specifications. Approved equal substitutions shall be allowed.

b. Specifications for toilet accessories are as follows:

i. Paper Towel Dispenser: Manufacturer: Bobrick Model: B-262 Color: Stainless Steel with Satin Finish

ii. Toilet Paper Dispenser:

Manufacturer: Bobrick Model: B-2888 Color: Stainless Steel with Satin Finish

iii. General Clarification:

The wall that separates Maintenance 106 from Electrical 105 and Office 102 extends to the underside of the roof deck.


18. Sheet 21/05-C-10

a. Specification section 13 49 19 applies to both the influent lift station building and the PAA feed building.

b. The elevation of the top of the influent lift station will be 628.00. Adjust adjacent pavement and yard elevation 627.75 and slope away from station at the same rate indicated on the site plan.

19. Sheet 16/05-C-05

a. The existing 6” VCP sewer is inactive and may be removed without replacement.

20. Sheet 80/100-ASM-01

a. Delete Detail E.

21. Sheet 19/05-C-08

a. Add SUT-10 – buried 1” HDPW natural gas line from natural gas service to

Administrative Building. Add SUT-11 – buried 1” HDPE natural gas line from natural gas service to Sludge Dewatering Building.

b. Change PFF-10 distance to match that of sheet 05-C-06 at +/- 40’.

22. Sheets 17 & 19/05-C-06 & 05-C-08

a. Outfall pipe shall be 24-inch dual wall HDPE equal to ADS N-12 plain end with external couplers. Headwall shall accommodate 24-inch pipe.

23. Sheet 75/85-ASM-08

a. Add Exhibit 75.1, Detail 3.

24. Sheet 51/60-ASM-03

a. Delete bend at PAA outfall basin.

END OF ADDENDUM NO. 3 TEXT

EJCDC® C-410, Bid Form for Construction Contracts. Copyright © 2013 National Society of Professional Engineers, American Council of Engineering Companies,

and American Society of Civil Engineers. All rights reserved. Auburn Water & Sewer Page 4 of 5 March 2020

Item Description of Work Unit Unit Price

1 Additional structural earth excavation and backfill/disposal CY $____________________________

2 Remove and replace unsuitable structural foundation material with crushed stone aggregate CY $____________________________

3 Remove and replace unsuitable pipe trench material with crushed stone aggregate CY $____________________________

4 10-inch PVC influent force main – additional footage LF $____________________________

5 24-inch HDPE outfall pipe – additional footage LF $____________________________

6 Additional 4-inch sidewalk concrete, complete in place SY $____________________________

7 Additional asphalt pavement and base, complete in place SY $____________________________

ARTICLE 6 – TIME OF COMPLETION 6.01 Bidder agrees that the Work will be substantially complete and will be completed and ready for final

payment in accordance with Paragraph 15.06 of the General Conditions on or before the dates or within the number of calendar days indicated in the Agreement.

6.02 Bidder accepts the provisions of the Agreement as to liquidated damages. ARTICLE 7 – ATTACHMENTS TO THIS BID 7.01 The following documents are attached to and made a condition of the Bid:

A. Required Bid security in the form of a Bid Bond (EJCDC No. C-430) or Certified Check (circle type of security provided);

B. If Bid amount exceeds $10,000, signed Compliance Statement (RD 400-6). Refer to specific equal

opportunity requirements set forth in the Supplemental General Conditions; C. If Bid amount exceeds $25,000, signed Certification Regarding Debarment, Suspension, Ineligibility

and Voluntary Exclusion - Lower Tier Covered Transactions (AD-1048); D. If Bid amount exceeds $100,000, signed RD Instruction 1940-Q, Exhibit A-1, Certification for

Contracts, Grants, and Loans;

E. Certification of Bidder Regarding Equal Employment Opportunity (CDBG – Form 950.1) F. Certification of Bidder (Contractor) Concerning Labor Standards & Prevailing Wage

Requirements (CDBG – Form 1421)

58" PLYWOOD

STANDING SEAM METAL ROOF

METAL HURRICANE TIE AT EACH TRUSS END

ALUMINUM GUTTER,SOFFIT & TRIM

2x8 NAILERWOOD TRUSSES

8" BOND BEAM WITH2-#5 BARS & 12"x10" J-BOLTSAT 24" MAX SPACING

8" CMU

#4@16" PLUS ALL CORNERS ANDADJACENT TO ALL OPENINGS

HORIZONTAL REINFORCING AT 16"

#4 DOWEL - 15" EMBED, 20" PROJ.

#3 STIRRUPS AT 12"

2'-6"

1'-0"

6"6"

10'-1

0"

#3@12" EW2-#5

EXTERIORWALL

ALL CELLS WITH REBAR TO BE GROUTED FULL

#4@32" PLUS ALL CORNERS ANDADJACENT TO ALL OPENINGS

#4 DOWEL - MAY BE CAST INPLACE OR SET IN EPOXY6" EMBED, 20" PROJECTION

HORIZ REINF @ 16"

6 MIL VAPORBARRIER

4" MIN No. 57 OVERCOMPACTEDSUBGRADE

8" STD CMU

ELEV 634.00

SNOW GUARDS

MEMBRANE FLASHING

7-#5 AS SHOWN

8"1'-0" 8"

1'-8"

NOTE:SEE ARCHITECTURAL DRAWINGSFOR OTHER REQUIREMENTS

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addendum no. 3 - mcghee engineering

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