IMMEDIATE RESPONSE REQUESTED“PENCO Single Rivet Unit, 6 Shelf (Cat. No. 461326) or equal.” 2. Refer to Section 4 Lab Floor Infill - Looking South. Below the Smoothface Masonry

C:\Users\kimm\Desktop\RedKey Cover Page Addendum No 1.doc

DATE: May 11, 2016

IMMEDIATE RESPONSE

REQUESTED

ADDENDUM ACKNOWLEDGEMENT

Upon receipt of this addendum, please fill in company name,

sign and IMMEDIATELY email or fax only this

acknowledgment to: * * * * 6 1 6 . 9 7 7 . 1 0 0 5 * * * * *

ADDENDUM NO. 1 Project No. 820340

Project Name: Town of Redkey Wastewater Treatment Plant Improvements Project Project Description: 2016 WWTP Improvements

Company Name:

Received by:

Date Received:

Failure to acknowledge this addendum may result in the rejection of your bid.

Addendum#1_Redkey_820340 Page 1

ADDENDUM No.1

Owner: Town of Redkey Project: 2016 Wastewater Treatment Plant Improvements Date: May 10, 2016 Engineer: Fleis & Vandenbrink Engineering, Inc. Engineer’s Project No.: 820340

NOTICE TO ALL PROSPECTIVE BIDDERS

DRAWING SHEETS ISSUED HEREWITH: none .

BIDS DUE: until 3:30 p.m. local time on June 2, 2016 (CHANGED) -- ISSUED TO ALL PLANHOLDERS

=====================================================================================

This Addendum is a part of the Contract Documents and modifies the previously issued Bidding Documents. Acknowledge receipt of this Addendum in the space provided on the Bid Form. Failure to do so may result in rejection of this Bid. SPECIFICATION CHANGES:

ITEM NO. 1: Section 00 01 13 – Advertisement for Bids 1. Change the date that bids will be received from “May 19, 2016” to “June 2, 2016”.

Reason for Delay: Clarifications are required on the collection system improvements project that warranted a delay. Bids for both projects will be received at the same date and time by the Owner.

ITEM NO. 2: Section 12 32 16 – Manufactured Casework 1. In paragraph 2.03.H, revise the third sentence to read as follows:

“All cabinets and drawers shall be lockable, with the exception of the sink base cabinet.” 2. Delete paragraph 2.04.A. in its entirety and replace with the following:

“A. Epoxy Resin: Based on “Durcon” Epoxy Resin Products; 1” thick, monolithic and molded

epoxy resin, color: Black. Provide with uniform 1” overhang at front of cabinets and provide 1/8” bevel. Provide tops as indicated on plans. Provide all required trim and tailpiece assemblies at sink locations. Provide ¾” back and end splashes 4” high of same material at all back and end terminations of top, unless noted otherwise.”

ITEM NO. 3: Section 26 32 13.16 – Gas Engine Driven Generator Sets 1. Add the following paragraph to 2.02 AUTOMATIC TRANSFER SWITCH:

“I. Acceptable manufacturers 1. Russelectric 2. Kohler 3. Generac 4. Eaton 5. ASCO 6. Cummins 7. Or equal.”


ITEM NO. 4: Section 32 12 16 – Aggregate and Hot Mixed Asphalt 1. Delete paragraph 3.02.H in its entirety. ITEM NO. 5: Section 33 32 55 – Portable Self-Priming Trash Pump 1. Add this specifications, which is attached. ITEM NO. 6: Section 40 21 13 – Submersible Pumps 1. Delete paragraph 2.02.B, in its entirety. ITEM NO. 7: Section 40 92 01 – Instrumentation and Controls for Process 1. Delete in its entirety from 2.12 FLOWMETERS, (B), (1.), part (f.). ITEM NO. 8: Section 43 21 36 – Rotary Lobe Pumps 1. Add the following paragraph to 2.01.A, which reads:

“5. Netzsch.”

2. Add the following paragraph to 2.02.A.3, which reads:

“c. Or provide replaceable radial liner wear plate with a minimum Brinell hardness of 550.” 3. Delete paragraph 2.02.B.4, in its entirety. 4. Add the following paragraph to 2.04.B, which reads:

“6. NORD Drivesystems.” ITEM NO. 9: Section 43 21 49 – Submersible Hydraulic Trash Pump System 1. Delete this specification in its entirety.

ITEM NO. 10: Section 46 21 00 – In-Channel Fine Screen 1. Add the following paragraphs to 2.01.B, which reads:

“5. Huber. 6. John Meunier.”

ITEM NO. 11: Section 46 23 24 – Grit Removal and Dewatering 1. Add the following paragraph to 2.01.A, which reads:

“5. Envirodyne Systems Inc.”


2. Add the following paragraph to 2.05.A, which reads:

“4. Control Panel shall bear the following applicable certifications: a. UL-698A if provided with intrinsically safe extensions to hazardous area. b. UL-508A if all field devices to hazardous areas are in NEMA7 enclosures.”

ITEM NO. 12: Section 46 30 01 – Oxidation Ditch Full Replacement 1. Add the following paragraph to 2.01.B, which reads:

“4. Envirodyne Systems Inc.” ITEM NO. 13: Section 46 41 05 – Compressed Gas Mixing System 1. Delete this specification in its entirety and replace with the attached specification. ITEM NO. 14: Section 46 43 11 – Chain-And-Flight Sludge Collection Equipment 1. Add the following paragraph to 2.01.A, which reads:

“5. Evoqua Water Technologies.” 2. Delete paragraph 2.02.N.3, and replace with the new paragraph which reads:

“3. The driver sprocket hub shall be provided with a trip lug that, upon torque overload, shall contact the actuator arm of the double throw limit switch which, in turn, shall shut-off the motor and energize the alarm circuit. The limit switch shall be a combination NEMA 4X / 7 enclosure and shall be provided with a stainless steel support bracket for positioning adjacent to the overload device.”

DRAWING CHANGES:

ITEM NO. 1: Sheet A2 1. Refer to the Admin Bldg- Lab Room Equipment Plan. Add the following sentence at the end

of the Heavy Duty Adjustable Metal Storage Rack note located at the top of the plan. “PENCO Single Rivet Unit, 6 Shelf (Cat. No. 461326) or equal.”

2. Refer to Section 4 Lab Floor Infill - Looking South. Below the Smoothface Masonry Block

note, add the following sentence: “Install wall tight to concrete roof deck above, approximately 10’-0” above Lab Floor Elevation (955.00).”

ITEM NO. 2: Sheet C10 1. Refer to the Typical Proposed Cross Section. Replace the word “Subgrade” with “Subbase”.


ITEM NO. 3: Sheet P4 1. Delete the label that reads “Clarifier MFR.* Panel”, and replace with “Clarifier Control Panel”.

Contractor shall note that this panel is shown on Sheet E9, Clarifier Wiring Diagram and would need to be constructed in accordance with specification Section 40 92 01, Instrumentation and Controls For Process by the Specialty Custom Panel Builder.

2. Delete the label that reads “Scum Pump* MFR. Panel”, and replace with “Scum Pump Control Panel”. Contractor shall note that this panel is shown on Sheet E9, Scum Pump Wiring Diagram and would need to be constructed in accordance with specification Section 40 92 01, Instrumentation and Controls For Process by the Specialty Custom Panel Builder.

3. Add a note to the bottom right corner of the sheet that reads as follows:

“Note: * Included in an equipment package.”

ITEM NO. 4: Sheet P5 1. Add a note to the bottom right corner of the sheet that reads as follows:

“Note: * Included in an equipment package.”

ITEM NO. 5: Sheet P8 1. Refer to the General Notes in Section 3. Add General Note No. 3 that reads as follows:

“3. Installation of Valve 42 is similar to the section view of Valve 43.”

ITEM NO. 6: Sheet E9 1. Refer to the Clarifier Wiring Diagram. Delete the overtorque warning light, relay AR1 and

associated wiring. Overtorque alarm light, relay AR2 and associated wiring shall remain. ITEM NO. 7: Sheet M1 1. Refer to the M1 Mechanical Plan Notes. Add the following note:

“ 18 Provide new dishwasher in Lab Room. Refer to Drawing A2 for location. Provide necessary water, drain lines and 120 volt power supply cord and plug. Dishwasher shall be 24” wide, have a stainless steel tub, Energy Start Compliant, noise rating of 48dB or lower, adjustable upper rack, removable upper rack, and heavy duty cycle. Color selection by Owner. Manufacturers include: Bosch, Kenmore, GE, Whirlpool, Electrolux or equal.”

ITEM NO. 8: Sheet E7 2. Refer to the Admin. Bldg. Upper Level Lighting & HVAC Plan. Add one 120 vac, 20 amp

dedicated outlet with 2 #12 & 1 #12 GND, ¾” for the dishwasher on circuit LPB-27 with 1 P, 20 amp breaker. Locate outlet below sink and to right, mount 6” above floor. See sheet A2 for exact location of dishwasher for outlet placement.


CLARIFICATIONS:

1. The wastewater treatment plant is located in Richland Township. The street address is 455 S. Union.

2. There is no American Steel, or Domestic Steel requirement for the project.

3. Davis Bacon Wage rates are not applicable.

4. There was a question as to how many bid securities the Owner would hold onto following bid opening. Generally the lowest two or three bidders will have their bid security held. Refer to Article 8- Bid Security within specification Section 00 21 13 – Instructions to Bidders for further clarification.

5. All contents of a contractor’s bid can be viewed by the public.

6. There was a question on where to find “Dampproofing” within the specifications. Please refer to Section 03 30 00- Cast-In-Place Concrete.

7. There was a question as to whether surplus or unsuitable excavated materials can be wasted onsite. Refer to Section 31 20 00- Earthwork, Article 3.08. The Owner indicated that a local resident, Roger Clay, may be interested in receiving the surplus materials. He may be contacted at 765.748.4268.

8. There was a question as to whether materials excavated from the trench of the new piping in the lawn or unimproved areas can utilized for the trench backfill area. If the excavated materials meets the definition of “Suitable Excavate Material”, then it may be used. Refer to Section 31 23 33- Trenching, Excavating, Backfilling and Compacting.

9. The prebid meeting attendees sign-in sheet is attached.

Any Revisions to any of the Contract Documents made by this Addendum shall be considered as the same revision to any and all related areas of the Contract Documents not specifically called out in this Addendum. FLEIS & VANDENBRINK ENGINEERING, INC.

David C. Harvey, P.E. Attachments: Section 33 32 55 – Portable Self-Priming Trash Pump Section 46 41 05 – Compressed Gas Mixing System Prebid Meeting, Sign-In Sheet

[Addendum No. 1] 820340 33 32 55 - 1 PORTABLE SELF-PRIMING TRASH PUMP

SECTION 33 32 55

PORTABLE SELF-PRIMING TRASH PUMP PART 1 - GENERAL 1.01 SUMMARY:

A. This Section includes but is not necessarily limited to, the furnishing of a portable self-priming trash pump as specified herein, and as necessary for the proper and complete performance of the Work.

B. The portable self-priming trash pump and related temporary piping and accessories to be used to prevent wastewater treatment plant (WWTP) effluent from backing up during a flood event within the Redkey Run. It also can be utilized for bypass pumping raw wastewater within the collection system.

C. Related Sections: 1. Documents affecting work of this Section include, but are not necessarily limited to:

a. General Conditions, Supplementary Conditions and Sections in Division 1 of these Specifications.

1.02 DESIGN AND PERFORMANCE REQUIRMENTS:

A. Design: 1. Trailer mounted. 2. Pumps shall be fully automatic self-priming units that do not require the use of foot-

valves or vacuum pumps in the priming system. 3. Pumps used shall be constructed to allow dry running for long periods of time to

accommodate the cyclical nature of flows. 4. Provide stop/start controls for each pump. 5. Portable, engine driven, self-priming centrifugal pump. 6. Capable of handling 1½-inch diameter solids. 7. Rated for periodic continuous duty for use as a bypass-pump and to drain various

basins and structures. 8. Hydrostatically tested at 1.5 times the operating point or 1.25 times the shut-off head,

whichever is greater. 9. Suction and discharge connections:

a. 4-inch, ANSI 150

B. Performance: 1. Treated Effluent Bypass Pump:

a. Design Pump operating speed: 1,200 rpm. b. Design capacity:

1) Flow: 470 gpm. 2) Total Dynamic Head: 18 feet.

1.03 SUBMITTALS:

A. Submit in accordance with Section 01 33 00 - Submittals.

B. Shop Drawings: 1. Submit for pumps and hosing. 2. Required information:

a. General: 1) Dimensions.


2) Details of construction and installation. b. Pump data:

1) Manufacturer. 2) Model. 3) Performance curves, include:

a) Pump curve (from shutoff to runout, gpm vs feet), NPSH required, efficiency, impeller diameter, pump speed, design point.

4) Materials of construction 5) Installation details. 6) Pump orientation. 7) Pump shaft seal details. 8) Bearing details 9) Weight.

c. Motor data: 1) Manufacturer. 2) Model. 3) Efficiency. 4) Weight.

C. Operation and maintenance manuals: 1. Submit for all equipment. 2. Required information:

a. Equipment function, normal operating characteristics and limiting conditions. b. Assembly, installation, alignment, adjustment and checking instructions. c. Operating instructions for start-up, routine and normal operating, regulation and

control, and shutdown and emergency conditions. d. Lubrication and maintenance instructions. e. Guide to "troubleshooting". f. Parts lists and predicted life of parts subject to wear. g. Outline, cross-sections, assembly drawings, engineering data and wiring

diagrams. h. Test data and performance curves. i. Copies of all reviewed Shop Drawings submitted.

1.04 QUALITY ASSURANCE:

A. Qualifications: 1. Fabrication and installation personnel:

a. Trained and experienced in the fabrication and installation of the materials and equipment.

b. Knowledgeable of the design and the reviewed Shop Drawings.

B. Manufacturer's services: 1. Submit Manufacturer's sworn statement that the equipment furnished complies with

this Specification. 2. Provide Manufacturer's field service. 3. Provide minimum 1 year unlimited hour warranty, from the start-up date, for all

products against defects in materials, workmanship, and intended functions.

C. Engines must be in current production by engine manufacturer.

D. All equipment shall be new, UL listed, factory tested, and delivered ready for installation.


1.05 DELIVERY, STORAGE AND HANDLING:

A. Receiving and storage: 1. All materials shall be delivered in original, unbroken, brand marked containers or

wrapping as applicable. 2. Handle and store materials:

a. In a manner which will prevent: 1) Deterioration or damage. 2) Contamination with foreign matter. 3) Damage by weather or elements.

b. In accordance with Manufacturer's directions.

B. Rejected material and replacements: 1. Rejected damaged, deteriorated or contaminated material shall be immediately

remove from the Site. 2. Replace rejected materials with new materials at no additional cost to OWNER.

1.06 MANUFACTURER'S SERVICES:

A. General: 1. Provide the services of a representative of the Manufacturer to verify the system

installation and to instruct the OWNER’s personnel in the proper operation and maintenance of each piece of equipment installed under the Section.

SECTION 2 - PRODUCTS

2.01 MANUFACTURERS:

A. Manufacturers: 1. Godwin. 2. Gorman-Rupp. 3. Or ENGINEER Approved Equal.

2.02 PUMP:

A. Impeller: 1. Dynamically balanced prior to shipment. 2. Material: Ductile iron or hardened cast chromium steel. 3. Open, non-clog design with pump out vanes.

B. Volute/Casing: 1. Material: Cast iron. 2. Equipped with ¾-inch drain plug. 3. ¼-inch suction and discharge plugged taps. 4. Provide two clean out locations (lower and upper) with cover. 5. Designed to allow removal of the rotating assembly without disturbing the suction or

discharge piping.

C. Wearplates: 1. Fully adjustable and replaceable. 2. Minimum hardness: 40 Rockwell C. 3. Material: Cast Iron or chromium iron.

D. Bearings and Shaft: 1. Each pump shall be fitted with a bearing bracket which contains the shaft and heavy

duty ball or tapered roller bearings


2. Bearings shall be sized to withstand all imposed loads 3. Minimum L10 bearing life of 100,000 hours. 4. Impeller shafts shall be carbon or alloy steel. 5. Bearing lubrication: oil. 6. Oil level site glass. 7. Provide ¾-inch oil fill and drain plugs.

E. Pump Seals: 1. Type: Mechanical, self-adjusting. 2. The mechanical seal shall be cooled and lubricated by an oil bath reservoir requiring

no maintenance or adjustment. 3. Pump shall be capable of running dry, with no damage, for extended periods of time. 4. All metal parts shall be stainless steel with Viton elastomers.

F. Integral check valve: 1. The pump shall be supplied with an integral check valve mounted on the discharge

flange of the pump. 2. Field replaceable.

G. Pump Base: 1. Material: Fabricated steel. 2. Suitable construction to support the full weight of the pump and motor under normal

operation. Vibration free under normal operation.

2.03 ENGINE:

A. Design: 1. General purpose diesel type, air cooled. 2. Governor: variable speed, engine mounted. 3. Lubrication: forced circulation. 4. Air cleaner: dry type. 5. Fuel Capacity: 30 gallons. 6. Full-load operating time: minimum 3.5 hours 7. Electrical Starting System:

a. 12 or 24 volt DC. b. Manual from storage battery with removable key in either on or off position.

8. Battery and Battery Charger: a. Battery: Lead acid, sealed in plastic with intercell connectors. b. Battery Charger: Adequate to fully recharge depleted battery in not more than

24 hours, and automatically control rate of charge. 9. Unit shall include a tachometer and hour meter. 10. Safety shut down switches for low oil pressure and mechanical shutdown for fan belt

failure. 11. Exhaust system shall include muffler and silencer of suitable size.

2.03 TRAILER:

A. Design: 1. Height, length, width and load capacity suitable for portable by pass pump and

engine, fuel tank, all accessories and full complement of fuel. 2. Trailer design shall be in compliance with applicable D.O.T. regulations. 3. Provide built-up jacks with sand shoes to stabilize the unit during operation and

manual operated jack at hitch to assist in raising tongue for connecting to tow vehicle.

4. Provide: a. DOT approved tail, side, brake, and directional lights


b. Safety chains c. Central lifting point

2.04 ACCESSORIES:

A. Suction and Discharge Hosing: All hose shall have gasketed, restrained joints capable of 150 psi working pressure. Use Bauer fittings. 1. Sewer Hose Assembly:

a. Suction: Provide three (3) lengths of 10-foot of rigid hose, with suction screen. b. Discharge: Provide seven (7) rolls of 50-foot lay flat hose. c. Provide two (2) rigid 90° bends.

2. WWTP Effluent Hose Assembly: Provide different colored hose for effluent pumping. Lengths are approximate and CONTRACTOR to verify lengths with field conditions. a. Suction: Provide two (2) lengths of 10-foot of rigid hose, with suction screen. b. Discharge:

i. One (1) 16-foot of semi-rigid hose. ii. One (1) 5-foot of semi-rigid hose. iii. One (1) rigid 90° bend.

PART 3 - EXECUTION

3.01 INSTALLATION:

A. Install equipment in conformance with: 1. The shop drawings approved by the ENGINEER. 2. The Manufacturer’s recommendations.

3.02 CLEANING:

A. Prior to acceptance of the work of this Section, thoroughly clean all installed materials and equipment and related areas in accordance with Section 01 74 00 - Cleaning.

3.03 PAINTING:

A. Pump, engine, base, and trailer shall be shop primed and finished painted at the place of manufacturer. Materials and thickness for priming shall be in accordance with manufacturer's standards.

B. All painting shall be done by the Manufacturer, prior to shipping.

END OF SECTION

[Addendum No. 1]

820340 46 41 05 - 1 COMPRESSED GAS MIXING SYSTEM

SECTION 46 41 05

COMPRESSED GAS MIXING SYSTEM

PART 1 - GENERAL

1.01 SUMMARY

A. Section includes: 1. This Section includes, but is not necessarily limited to, the major items listed below as

indicated on the Drawings, as specified herein, and as necessary for the proper and complete performance of the Work.

2. Major items: a. Air compressor. b. Control panel. c. Pipe header. d. Nozzles. e. Diffused aeration header with support stand. f. Low-pressure membrane diffusers.

B. Related Sections: 1. Documents affecting work of this Section include, but are not necessarily limited to:

a. General Conditions, Supplementary Conditions and Sections in Division 1 of these Specifications.

1.02 REFERENCES

A. Except as herein specified or as indicated on the Drawings, the work of this Section shall comply with the following: 1. ASTM Standard Specifications:

a. A240 - Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and General Applications.

b. A276 - Stainless Steel Bars and Shapes. c. A312 - Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel

Pipe 2. ASTM Standard Practice:

a. A380 - Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems.

1.03 DEFINITIONS

A. Terms: 1. Basin: The structure within which mixing occurs; i.e., Sludge Holding Tank. 2. Header Supply Pipe: Piping between a valve control panel and respective nozzle

headers. 3. Nozzle Header: Continuous (i.e., not branched) horizontal piping with nozzle offsets, with

single inlet connection to header supply pipe and outlet offset connections to nozzles. 4. Nozzle Offset: Piping branching off nozzle header trunk piping and which connects to

nozzles. 5. Nozzle: Floor-anchored, large bubble-emitting device. 6. Standard Cubic Feet per Minute (scfm): Air at 60° F, 14.696 psia, and 36 percent relative

humidity.

[Addendum No. 1]


7. Actual Cubic Feet per Minute (acfm): Terminology to quantify volume of air at the standardized reference condition (ISO 1217) delivered to the terminal point of the compressor package.

8. Valve Control Panel (VCP): Control panel that controls the firing of integral solenoid valves, which intermittently emit compressed air bursts to the respective header supply pipes.

9. Aeration Header: Stainless steel pipe carrying air to low pressure membrane diffusers. 10. Low Pressure Membrane Diffusers: Membrane diffusers with integral check valve to

provide air required to deliver oxygen in sludge holding tank.

1.04 DESIGN AND PERFORMANCE REQUIREMENTS

A. Basin Mixing shall be uniform throughout the basin with effective mixing confirmed through a Field Performance Test.

B. Air Distribution and balancing shall be sufficient to maintain suspended solids in a state of suspension over entire depth of basins. VCP shall allow operator-variable control of firing parameters (pressure, sequence, duration, and frequency) to achieve basin mixing.

C. Firing pressure shall be automatically adjusted via the automatic adjustable regulator, or throttling valve.

D. Air mixing system equipment and piping shall be sized to thoroughly mix the contents of the basins for which the systems are designed.

E. Treatment process:

Sludge Holding Tank Floor Ring

Side-Wall Ring

Diffused Aeration

Basin Geometry Conical Basin Dimensions See Drawings Side Water Depth (SWD) ~21-ft Number of Basins 1 Number of VCPs per Basin 1 Number of ACVs per VCP 3 Number of Nozzle or Diffuser Headers 1 1 1 Number of Nozzles or Diffusers per Header 4 8 16 Minimum Number of Nozzles, Total per Basin 12 16 Header Supply Pipe Dia. (inch) 2

1.05 SUBMITTALS

A. Submit in accordance with Section 01 33 00 – Submittals.

B. Shop Drawings: 1. Submit for Compressed Gas Mixing System. 2. Required information:

a. Catalog data or illustrations showing principal parts and materials. b. Detailed layout drawings. c. Electrical schematics. d. Compressor support locations and loads transmitted to bases and foundations. e. Compressor electrical schematics and field termination wiring. f. List of recommended spare parts other than those specified. g. Field inspection reports.

[Addendum No. 1]


h. Qualifications of field service technician. i. Recommendations for short and long-term storage. j. Testing procedures. k. Special tool requirements. l. Full scale test results from a minimum of three U.S. installations demonstrating

that the Compressed Gas Mixing System achieved homogeneous mixing as substantiated through statistical analysis of Total Suspended Solids (TSS) samples yielding a Coefficient of Variation (Cv) of 10% or less.

m. Installation reference list including a minimum of five Compressed Gas Mixing Installations for which the Supplier furnished and integrated the complete Compressed Gas Mixing System, including at a minimum Nozzles, In-Basin Piping, Valve Control Panels and Compressor. Provide Facility Name/Location, Design Average Daily Flow, Contact Name/Telephone Number and Start-Up Date for each installation.

C. Operation and maintenance manuals: 1. Submit for Compressed Gas Mixing System. 2. Required information:

a. Equipment function, normal operating characteristics and limiting conditions. b. Assembly, installation, alignment, adjustment and checking instructions. c. Operating instructions for start-up, routine and normal operating, regulation and

control, and shutdown and emergency conditions. d. Recommended lubricants. e. Lubrication and maintenance instructions. f. Guide to "troubleshooting". g. Parts list and predicted life of parts subject to wear. h. Outline, cross-sections, assembly drawings, engineering data and wiring diagrams. i. Test data and performance curves.

1.06 QUALITY ASSURANCE

A. Qualifications: 1. Fabrication and installation personnel:

a. Trained and experienced in the fabrication and installation of the materials and equipment.

b. Knowledgeable of the design and the reviewed submittals.

B. Manufacturer's services: 1. Submit Manufacturer's sworn statement that the equipment furnished complies with this

Specification. 2. Provide Manufacturer's field service.

1.07 DELIVERY, STORAGE AND HANDLING

A. Receiving and storage: 1. All materials shall be delivered in original, unbroken, brand marked containers or

wrapping as applicable. 2. Handle and store materials:

a. In a manner which will prevent: 1) Deterioration or damage. 2) Contamination with foreign matter. 3) Damage by weather or elements.

b. In accordance with Manufacturer's directions.

[Addendum No. 1]


B. Rejected material and replacements: 1. Reject damaged, deteriorated or contaminated material and immediately remove from the

Site. 2. Replace rejected materials with new materials at no additional cost to OWNER.

1.08 WARRANTY

A. The manufacturer shall guarantee the equipment against defects in materials and workmanship under normal use and service, to the original purchaser, as follows: 1. Control Panels - Thirty six months from date of start-up. 2. Piping - Thirty six months from date of start-up. 3. Packaged Compressors - Twelve months from date of start-up

a. Air end on Packaged Compressors - Twelve months from date of start-up or eighteen months from date of shipment from factory, whichever occurs first.

b. Parts - Twelve months from date of factory shipment.

B. Requirements to maintain customer warranty: 1. Factory Authorized start-up by a distributor/factory store. 2. OEM filters and oil used at the intervals described in the compressor O&M manual

provide to customer during start-up. 3. Oil Samples are taken every 2000 hours of run-time as defined in compressor O&M

manual.

C. Warranty shall not apply and manufacturer shall not be responsible nor liable for: 1. Consequential, collateral or special losses or damages. 2. Equipment conditions caused by fair wear and tear, abnormal conditions of use,

accidents including acts of God, power surges, neglect or misuse of equipment, improper storage.

3. Deviation from operating instructions, specification or other special terms of sales. 4. Labor charges, loss or damage resulting from improper operation, maintenance or repairs

made by person(s) other than compressor manufacturer or manufacturer’s authorized service technician.

5. Failure to maintain proper routine maintenance on the compressor as defined in the compressor manufacturer’s operating and maintenance instructions.

1.09 SPARE PARTS

A. Extra materials (a.k.a. spare parts): 1. General:

a. Supplied by Manufacturer of installed equipment. b. Deliver to OWNER prior to start-up.

B. Provide parts that are identical to and interchangeable with similar parts installed. 1. Two air control valves (ACVs) 2. One pressure regulator or throttling valve re-build kit. 3. One 5-micron air filter. 4. Two compressor intake air filter elements. 5. Two compressor air-oil separator filter elements. 6. Two each compressor primary/secondary filter elements. 7. Three diffuser holders. 8. Five membrane diffusers. 9. Any other standard parts recommended by the Manufacturer.

[Addendum No. 1]


PART 2 - PRODUCTS

2.01 MANUFACTURERS

A. Compressed Gas Mixing System shall be the product of: 1. EnviroMix, Inc. 2. Pulsed Hydraulics Inc. 3. Or other approved equal by engineer.

2.02 MATERIALS

A. Header supply piping: 1. Provide threaded connections where required for disassembly. 2. Schedule 5S, Type 304 stainless steel Press technology system (Victaulic, Viega, or

equal), comprised of stainless steel Press technology fittings, couplings, and pipe, unless specified otherwise.

3. Maximum working pressure of 200 psi. 4. Couplings and fittings: Press technology products formed of Type 304/304L stainless

steel tubing including a self-contained O-ring seal(s) molded of synthetic EPDM rubber. 5. Pipe: Type 304/304L ASTM A312 stainless steel. 6. Provide pipe from compressor to receiver and receiver to VCP. Provide 2 inch NPT

treaded connection located between receiver and VCP for plant air supply to air lift pump.

B. Nozzle and diffuser headers: 1. Schedule 10S, Type 304 stainless steel with 1 inch Schedule 40S, Type 304 stainless

steel nozzle offsets. 2. Nozzle couplings: 1 inch NPT, 150 lb, 304 stainless steel. 3. Diffuser connections: 3/4 inch weld-o-let threaded couplings. 4. Delivered from the Manufacturer pre-assembled to the extent practicable to minimize field

assembly error and installation time. 5. Provide removable end caps on all nozzle and diffuser headers.

C. Nozzles: 1. Top plate fabricated from 1/8 inch stainless steel plate, ASTM A240, Type 304 with a 2D

finish. 2. Bottom plate fabricated from HDPE and gasketed to prevent air from leaking between the

top plate and the bottom plate. 3. Top and bottom nozzle plates shall be joined together using Type 304 stainless steel

hardware. Nozzles shall come pre-assembled. 4. Adequate strength to withstand vertical thrust of mixing air. 5. Threaded rod anchors: Hilti HIT-RE 500 adhesive or equal. A minimum of two threaded

rods shall be installed per nozzle, one each on opposite diagonal corners.

D. Diffusers: 1. Design PVC holder with air flow control orifice, diffuser support plate and removable

retainer ring. Holder shall provide support for the diffuser and seal the diffuser in the holder to prevent air leakage around the O-ring.

2. PVC diffuser holder shall have 3/4 inch NPT connector to thread into header pipe. 3. Membrane diffuser:

a. Incorporate an integral check valve into the membrane diffuser. b. Design and test diffusers for a dynamic wet pressure (DWP) of 12 inches +/- 20%

water column @ 1.0 SCFM/diffuser and 2 inches submergence. c. Visual uniformity – Observe diffusers for uniform air distribution across the active

surface of the diffuser at 1.0 SCFM/diffuser and 2 inches submergence. Active surface is defined as the perforated horizontal projected area of the diffuser.

[Addendum No. 1]


d. Manufacture circular membrane diffuser with integral O-ring of EPDM synthetic rubber compound with precision die formed slits.

e. Add carbon black to the material for resistance to ultraviolet light. f. Design diffuser as one piece injection molded part with a minimum thickness of

0.080 inches for 9 inch diameter unit. g. Limit the maximum tensile strength of the diffuser to 10 psi when operating at 2.4

SCFM/sq. ft. of material.

E. Appurtenances: 1. Miscellaneous: Nuts, bolts, washers, threaded rod, and other non-welded parts shall be

stainless steel, ASTM A240, Type 304. Threaded assemblies shall be chemically treated or lubricated prior to assembling to prevent galling.

F. Fabrication: 1. Piping used for air mixing system shall be Type 304 stainless steel unless otherwise

noted. 2. Shop fabricate welded metal parts and assemblies from stainless steel, ASTM A240,

Type 304 with a 2D finish. 3. Shop fabricate non-welded parts and pieces from sheets and plates of stainless steel,

ASTM A240, Type 304 or from bars of stainless steel ASTM A276, Type 304, unless specified otherwise.

4. Welds and welding procedure: a. Shop weld with filler wire using MIG, TIG or shield-arc, or plasma-arc welding inert

gas processes. Provide a cross-section equal to or greater than parent metal. b. Provide full penetration butt welds to interior surface with gas shielding to interior

and exterior of joint. c. Provide smooth, even distribution interior weld beads with an interior projection not

exceeding 1/16 inch beyond inner diameter of nozzle header or fittings. d. Field welding is not permitted. e. Clean all welded stainless steel surfaces and welds after fabrication to remove

weld splatter and finish clean all exterior welds, carbon deposits and contaminants per ASTM A380 Section 6.2.11

2.03 CONTROL PANELS

A. Valve control panel (VCP) enclosures: 1. VCPs shall have UL 508A rated NEMA 4X 304 stainless steel enclosures. Control panels

HVAC shall be sized to provide heat dissipation such that, at a 110 degree F ambient temperature, the operating temperature rating of the lowest-rated component in the panel is not exceeded. This shall be accomplished by exhaust fans, air conditioners, heaters or any combination of the three.

2. Enclosure shall be provided with a hinged cover for the operator interface to protect against sun damage and intrusion damage.

3. Power connection: Panel shall accept a single source 120 VAC power connection. Provide lightning and surge protection on the incoming line power. Lighting and surge protection shall be Phoenix Contact Mains Plugtrab or equal.

4. Operator interface terminal (OIT): VCP shall have an OIT to make operating parameter changes and acknowledge alarms. OIT shall be a Schneider Electric 5.7 inch color touchscreen. OIT shall have 16 MB EPROM flash memory capacity, USB port, and Ethernet communication or equal.

5. Controller: Each control panel shall be equipped with a controller which controls the sequence, duration, and frequency of ACV openings via relay outputs. The controller shall also provide alarming functionality. The controller shall be equipped with 10/100 BaseT Ethernet port with Modbus TCP/IP.

6. Air control valves: Air control valves shall be poppet style valves, mounted to a common manifold. The valves shall have a life expectancy of 20,000,000 cycles.

[Addendum No. 1]


7. Air pressure regulator: VCP shall be equipped with an adjustable regulator to adjust the pressure to the ACVs and corresponding header supply piping. The regulator shall be pre-plumbed in the VCP and be equipped with a 2-1/2 inch pressure gauge. The regulator shall have an aluminum body and bonnet, plated steel screws, brass internals, and Buna N seals.

8. Throttling Valve. Each VCP shall be equipped with a throttling valve to adjust the volume of air released to the ACVs and corresponding header supply piping. The throttling valve shall be pre-plumbed into the VCP.

9. Control air filter: VCP shall include a pre-plumbed 5-micron filter with an auto-drain to remove fine particles, water vapor, and oil from the air supply. The filter shall be Watts F603D or approved equal.

10. Heater: VCP shall be equipped with a 120 VAC heater designed to maintain 40 degrees F in an ambient outside temperature of 0 degrees F. The heater shall be equipped with a thermostat to turn the heater off at temperatures above 40 degrees F.

11. Nameplate: A stainless steel nameplate shall be provided on the control panel. The nameplate shall be securely fastened in a conspicuous place and clearly inscribed with the manufacturer’s name, year of manufacture, and serial number.

12. Provide two terminal blocks in control circuit for field dry contact interlock permissive from Grit System.

13. Asset Monitoring System. Each control panel shall have the ability to communicate asset-level derail including valve performance through alerts and notifications; information including remaining life of the valve, pane faults, and running data.

2.04 CONTROL AND OPERATION

A. Control features shall be adjustable from the OIT provided by the mixing system manufacturer. Control features shall be adjustable at any time during the operation of the system. Control features shall be initially set according to manufacturer recommendations. In addition to controlling mixing, the valve control panel shall provide air to the low-pressure membrane diffusers.

B. Diffusers: Air supply to the diffusers will be supplied and controlled out of the VCP. 1. A manual flow meter and throttling valve will set the flow rate. 2. A modulating pressure regulator or throttling valve will automatically adjust the pressure

to the diffusers with varying water level in the sludge storage tank to maintain constant air flow.

3. A solenoid valve on the diffuser system will close to divert flow to the air lift pump when an external discrete, dry contact, air lift pump run signal is received.

C. Mixing parameters: Minimum control features shall include the following: 1. Sequence – Menu of preprogrammed operator selectable air control valve firing

sequences. 2. Duration – Selection of the length of time the ACV is open during a firing. This value shall

be adjustable to the 1/1000th of a second with a minimum value of 0.001 seconds and a maximum value of 2 seconds.

3. Frequency – Selection of the frequency at which each ACV is firing. This value shall be adjustable to the 1/10th of a second with a minimum value of 1 second and a maximum value of 30 seconds.

D. Startup modes: Controller shall enable startup modes that utilize the manufacturer default settings, firing parameters set during the preceding mixing system operation, as well as new settings entered through the OIT.

E. Pressure alarms: VCP shall come equipped with a pressure transducer plumbed to the regulator. The pressure transducer shall transmit pressure anomalies to the controller. The

[Addendum No. 1]


controller shall interpret the pressures transmitted to provide low system pressure and high system pressure alarms.

F. Valve failure alarms: VCP shall come equipped with a pressure transducer plumbed in the VCP. The controller shall interpret the pressure to provide valve fail to open alarms.

G. Alarm annunciation: When either the low system pressure, high system pressure, valve fail to open alarms occur within a VCP a red general alarm light shall be illuminated on the top of the VCP. The specific alarm shall be indicated on the Operator Interface Terminal on VCP. Each VCP shall come equipped with a general fail alarm dry contact for remote alarm annunciation. The fail alarm dry contact shall open under the same circumstances that the amber general alarm light is illuminated. The fail alarm dry contact shall remain open until the fault is corrected or the system is turned off.

H. Heartbeat function: The PLC shall have a register with a bit that toggles at a regular interval to act as a heartbeat for confirmation of continued PLC operation and network communication.

2.05 AIR COMPRESSOR

A. One air compressor module shall be provided. Each shall include an inlet air filter, compressor with an AC motor, air/oil separator reservoir, air cooled oil cooler, cooling fan, separator pressure relief valve, discharge check valve, filters, controls, control panel, base, valves, piping, and unloading system.

B. Compressor module shall be completely factory assembled requiring only field connection of electrical power, and air and condensate drain piping.

C. Compressor shall be of the single stage, positive displacement, oil-flooded, rotary screw type. The compressor shall be provided with integral skid or lifting lugs for unloading and placement.

D. Motor driving arrangement: 1. The air end shall have a 4-6 lobe combination with both male and female rotors being

identical in diameter. The discharge end of the rotors shall be supported by back-to-back mounted duplex tapered roller bearings. The suction end of the rotors shall be supported by a single row of cylindrical roller bearings. Bearing life shall be in excess of 300,000 hours.

2. The air end shall be driven by a multiple belt, “V” groove belt-drive arrangement. The unit must be belt-driven with no step-up or reduction gears. Proper belt tension shall be maintained by an automatic spring-loaded belt tensioner located on the motor base with an indicator pin to note when the belts need to be changed. The tensioning device should not have to require any adjustments for the life of the belts. Using motor weight as an automatic tensioning device is not acceptable.

3. The compressor sealing/cooling fluid shall be air-cool and shall have a fan cooled, fin-type fluid cooler. Configuration shall include a thermal mixing valve and by-pass line to ensure proper air/fluid discharge temperature to the compressor. The cooling system shall be capable of maintaining proper compressor temperatures in the ambient conditions up to 110 degrees F.

4. Fluid circulation shall be maintained by the pressure differential between the reservoir pressure and the vacuum level on the suction side of the air end. There shall not be a separate motor driven fluid pump.

5. An air/oil separator reservoir shall be provided for each compressor. The reservoir shall be designed and constructed in accordance with the ASME Code for Unfired Pressure Vessels and shall bear the code stamp. The reservoir shall include two-stage filtration to remove oil from air stream. Oil carry-over downstream of compressor modules shall not exceed 3 mg/cubic meter.

[Addendum No. 1]


6. Each air compressor module shall have automatic controls integral to the unit which open (loaded condition) and close (unloaded condition) the inlet valve to the air end to deliver appropriate volume to meet demand and maintain system target pressure. On sensing a low demand, the motor will keep running but the air end inlet valve will close, resulting in a decreased “idling” power draw on the motor. The valve shall reopen when system pressure drops below the set point.

7. Each baseplate shall be constructed of one-piece folded mild-steel with structural members and shall be designed for no measurable deflection with the equipment mounted thereon and the baseplate supported around its perimeter. Each base shall be designed so that all equipment bolted to it can be removed without access to the underside of the plate and with a flat top surface for ease of cleaning. Structural stiffeners shall be located under the compressors at the compressor anchor points.

8. Valves and piping within the enclosure shall be the compressor manufacturer's standard. Relief valves shall be provided for equipment protection on the air and coolant systems.

9. Compressor shall be provided with an integral, dry-type intake filter. Intake filters shall have replaceable filter element(s). Particle arrestance shall be not less than 99.9% efficient at 10 microns and above.

10. Compressor shall be supplied in a sound attenuated enclosure. The enclosure shall reduce the measured sound to a maximum of 75 decibels, as measured by ISO 8571, while the compressor is operating and the sound level is measured a distance of three feet from the enclosure.

11. A pressure relief valve shall be provided on the reservoir. This valve shall be sized to handle the full capacity of the compressor.

12. A high air/fluid temperature shutdown system shall be provided. The unit must have safety devices mounted and wired. Safety devices shall include motor thermal overload and high compressor discharge temperature shut-down. These systems must be designed to prevent the compressor from running in an over-temperature situation or motor from running in an overload condition.

13. The compressors shall be as manufactured by Quincy, Model QSLP 10 or equal.

E. Free standing air receiver: 1. One air receiver shall be provided. The receivers shall be designed and constructed in

accordance with the ASME Code of Unfired Pressure Vessels and shall bear the code stamp.

2. Receivers shall be factory powder coated. One quart touch-up paint shall be provided. 3. Each receiver shall be provided with mounting feet and lifting lugs. 4. Each receiver shall be provided with an auto-drain with a 115-V, 60 Hz grounded power

cord. Auto-drain shall include a timer that controls frequency and duration of opening.

F. Compressor system particulate and oil filters: 1. Replaceable-cartridge primary particulate and secondary high-efficiency oil-removal

filters shall be provided shall be to the compressor package. The filters shall be effective to 0.01 micron for particles and external coolant removal to 0.01 mg/cubic meters at 21 degrees C.

2. The filters shall be rated for the maximum discharge capacity of the air compressor.

G. Compressor system electrical: 1. Electrical and control equipment for the air compressor module shall be furnished as

required for a complete installation, requiring only field connection of 480 VAC, three phase power supply.

2. Compressor electric motor shall be rated 480 volts, 60 Hz, three phase.

H. Compressor system control panel – Provide an enclosure-integrated UL 508A listed control panel mounted on the compressor module shall include: 1. Full voltage, non-reversing, circuit breaker type combination motor starters sized as

required by the manufacturer

[Addendum No. 1]


a. Starters shall include auxiliary contacts. One normally open auxiliary contact shall be provided for run status.

b. Magnetic motor circuit protectors shall be 3 phase, 480 volts, molded-case circuit breakers with instantaneous trip elements. The breakers shall be manually operated with quick-make, quick-break, trip-free toggle mechanism.

c. One thermal overload relay shall be provided in each phase lead. Each starter shall be provided with an external manual reset push button for reset of the thermal overload relays. Overloads shall be bimetallic ambient compensated type, matched to motor current, and shall be provided with a manual reset pushbutton.

d. The complete starter shall have an interrupting rating of at least 10,000 amperes at 480 volts.

2. Control power transformers shall have both primary leads fused, one secondary lead fused, and one secondary lead grounded.

3. Terminal blocks for all system wiring. Internal panel wiring shall be neatly bundled and tied and shall be identified with suitable wire markers.

4. Gauges and indicators shall be provided to indicate the following conditions: a. Differential pressure across fluid filter. b. Discharge pressure. c. Compressor discharge temperature. d. Power on. e. Hours of operation. f. Operating mode. g. Differential separator. h. Percent capacity. i. Air filter.

5. A contact which closes under alarm conditions shall be provided for the compressor for remote "fail" alarm. The contact shall close when any alarm occurs for the compressor.

I. Compressor shop painting: 1. Components of the compressed air equipment system shall be shop primed and finish

painted with the manufacturer's standard paint system prior to shipment to the site.

J. Compressor shop test: 1. Prior to shipment each compressor module shall be operated to check alignment; faulty

equipment and controls; proper wiring; leaks in piping, seals, or wells; and proper operation of the safety and operating controls. Compressor pressure controls shall be adjusted to the specified pressures. Defective equipment and controls disclosed by such tests shall be replaced and the package placed in satisfactory operating condition before shipping.

K. Compressor system performance and design requirements: 1. Design requirements:

a. Service capacity: 86 acfm @ 38 psig. 2. Compressed air equipment shall be designed for the following operating conditions:

a. Ambient conditions: 1) Maximum air temperature: 95 degrees F. 2) Minimum air temperature: 35 degrees F. 3) Relative humidity: 80 percent. 4) Barometric pressure: 14.6 psia.

b. Compressors: 1) Number required: 1 2) Maximum discharge pressure: 40 psig. 3) Operating target pressure: 35 psig. 4) Capacity at operating target pressure: 86 acfm. 5) Motor size: 10 hp. 6) Maximum motor shaft speed: 1600 rpm.

[Addendum No. 1]


7) Maximum noise level measured at 3 feet (with enclosure): 75 dBA. c. Receivers:

1) Number required: 1. 2) Design pressure: 200 psig. 3) Nominal volume: 60 gal.

d. Filters 1) Type Particulate, high efficiency oil removal 2) Number required: 1 per compressor.

PART 3 - EXECUTION

3.01 INSTALLATION

A. Install in conformance with: 1. The submittals reviewed by ENGINEER. 2. The Manufacturer's recommendations.

B. Nozzles on respective nozzle header shall be level within ½-inch of a common horizontal plane.

3.02 FIELD QUALITY CONTROL

A. Manufacturer's field service: 1. Arrange and pay for Manufacturer's service technician to:

a. Provide the services indicated below. b. Minimum onsite time: 3 days.

2. Schedule the following: a. As soon as practicable after installation. b. At times approved by ENGINEER and OWNER.

3. Manufacturer's service technician: Installation inspection and testing. 4. Promptly make all changes and additions required by Manufacturer's service technician. 5. Manufacturer's service technician:

a. Assist in start-up. b. Demonstrate operation and maintenance to OWNER's personnel. c. Review operation and maintenance manual with OWNER's personnel.

6. Submit Manufacturer's service technician's written approval of installation.

B. Field performance test: 1. Mixer components shall be field tested with the respective basins full to the maximum

water surface elevation. 2. Exposed air piping shall be tested by CONTRACTOR for leaks using soapy water on all

joints and applying 100 psi test pressure. Buried air piping shall be tested using this method before the trench is filled. Air piping in the tanks may be tested by submersing the piping in non-potable water and pressurizing the piping to 100 psi in lieu of using soapy water on all joints. Pressure testing requirement shall not apply to pre-manufactured nozzle headers.

3. CONTRACTOR shall operate each mixing system at the maximum water surface elevation in the basins for a continuous period of not less than 72 hours. The CONTRACTOR shall correct and resolve all operating problems, deficiencies, etc., determined as a result of the tests.

4. After the above testing is complete, field mixing performance testing of the installed air mixing system shall be performed by the manufacturer as described below. a. Mixing performance testing shall be conducted in the following basin: Sludge

Holding Tank

[Addendum No. 1]


b. Personnel and equipment necessary to conduct and supervise all testing shall be provided by the mixer manufacturer. ENGINEER and OWNER shall be notified of the test to witness at their option and expense.

5. Prior to performing the tests, the basin which will be tested must have been in normal operating mode for at least two days with TSS in typical operating ranges of 4,500 – 6,500 mg/L. No flow shall enter or exit the respective basin for two hours prior to and during the test.

6. Compressed gas mixing system manufacturer shall conduct total suspended solids (TSS) testing using a Hach Model LXV322, or equal, suspended solids analyzer. a. Analysis shall be performed in accordance with Standard Methods for the

Examination of Water and Wastewater. 7. Testing Procedure:

a. Three horizontal-plane sample sites for the Sludge Holding Tank shall be selected by the ENGINEER. At each sample site, three vertical samples shall be collected as follows: 24-inches from the surface, tank sidewall mid-point and 24-inches above the tank sidewall bottom. Each sample site must be a minimum of 24 inches away from any structure within the tank. The nine samples for each location shall be analyzed as described above.

b. Coefficient of Variation (Cv) shall be determined for the sample set, excluding the maximum and minimum samples. The Cv shall be calculated by taking the resultant set of seven samples as follows: Cv = (100 x Standard Deviation of Seven Samples)/(Mean Value of Seven Samples).

c. If the Cv is less than or equal to 10%, then the mixer performance shall be acceptable for that location.

d. If the Cv is greater than 10%, then the mixer performance shall be unacceptable for that location and the CONTRACTOR and/or Manufacturer shall make all necessary improvements (at no additional cost to the OWNER) and repeat the testing procedure at no additional cost to the OWNER until the Cv is less than or equal to 10% for that location.

3.03 CLEANING

A. Thoroughly clean all installed materials and products and related areas: 1. Prior to acceptance of the work of this Section. 2. In accordance with Section 01 74 00 – Cleaning and Waste Management

END OF SECTION