Of 3 ADDENDUM #1 CITY of NIXA, MISSOURI SLUDGE DEWATERING FACILITY IMPROVEMENTS This Addendum #1, Dated February 8, 2021
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ADDENDUM #1 CITY OF NIXA, MISSOURI SLUDGE DEWATERING FACILITY IMPROVEMENTS This addendum #1, dated February 8, 2021 hereby modifies the plans and specifications for the above referenced project as follows: A. PLANS: 1. Plan Sheet 5 of 12: Contractor shall install hydrant with a ¾” hose bib on the 1-1/2 inch Sch 80 water supply line adjacent to the proposed shaftless conveyor to allow for periodic cleanup of conveyor. 2. Plan Sheet 6 of 12: Contractor shall provide Siemens Model Mag 5100W Flow Sensor w/Siemens Model Mag 5000 signal converter or approved equal. 3. Plan Sheet 8 of 12: Please note that the original plans indicate a conveyor incline of 16 degrees. The revised angle of inclination will be 22 degrees. Manufacturer will account for this increase in angle when determining the required length of conveyor. 4. Plan Sheet 8 of 12: All reference to automatic discharge valve at the sludge conveyor shall be eliminated. No valve will be required. 5. Plan Sheet 8 of 12: Reference to a portable hoist and Gantry crane shall be disregarded. No hoist or crane will be required. B. SPECIFICATIONS: 1. Contractor shall remove the original Bid Form from the specifications and insert the attached revised Bid Form indicating the equipment requirement for submitting the Base Bid. 2. Contractor shall remove the original specification section 11A-Centrifuge and insert the attached specification. 3. Contractor shall remove the original specification section 11B-Dewatered Sludge Conveyor and insert the attached specification. 3. Contractor shall remove specification section 11F-Gantry Crane from the specification booklet. Gantry Crane will be purchased at a later date. 4. Division 2 Section 2A-Centrifuge should read Division 11 Section 11A-Centrifuge. Page 11A-1 Design Requirements paragraph B shall be revised as follows: The sludge to be dewatered will be product of municipal water or wastewater treatment and shall be aerobically digested sludge. Page 1 of 3 5. Contract Agreement: Article 3 Contract Time, Paragraph 3.1 shall be revised to read: 3.1 The work will be substantially completed on or before November 30, 2021, and completed and ready for final payment on or before December 31, 2021. 6. Division 2 Section 2A-Centrifuge should read Division 11 Section 11A-Centrifuge. Page 11A-1 Design Requirements paragraph B shall be revised as follows: B. The sludge to be dewatered will be product of municipal water or wastewater treatment. Prior to dewatering sludge will be aerobically digested. 7. Division 11A Section 1.4 Quality Assurance Paragraph A on page 11A-2: It is the intent of the specifications that the following paragraph supersedes any other requirements of the specifications: A. The manufacturer shall guarantee the decanter centrifuge to be free from defects in materials and workmanship for a period of twelve (12) months following installation or eighteen (18) months following the delivery. Any defects found within the warranty period shall be repaired or defective components replaced. Ancillary and control components shall be warranted per the original equipment manufacturer’s warranty. 8. Division 11A Section 2.13 Instrumentation and Controls Paragraph C on page 11A-9: Note that this paragraph specifies a Pilz safety emergency stop relay. It is intended that the safety emergency stop relay may be Siemens, Pilz or equal. 9. Division 11A Section 2.13 Instrumentation and Controls Paragraph E on page 11A-9: Note that this paragraph specifies a Siemens redundant control power supply. It is intended that the safety emergency stop relay may be Siemens or equal. C. GENERAL: 1. The contractor shall provide a support structure for the proposed centrifuge in accordance with the centrifuge manufacturer’s recommendations. 2. The contractor shall provide supports for the discharge end of the shaftless conveyor in accordance with the conveyor manufacturer’s recommendations. 2. It is the intent of the bidding documents that the centrifuge manufacturer shall furnish a programmable logic controller (PLC) capable of controlling the centrifuge unit, sludge feed pump, inclined screw conveyor, polymer preparation system and the wash water valves. Centrifuge manufacturer shall furnish the centrifuge unit, support structure for centrifuge unit and polymer preparation system. Sludge feed pumps, electromagnetic flow meter and inclined screw conveyor will be supplied by others. Page 2 of 3 Each Contractor submitting a bid shall acknowledge receipt of this Addendum #1 in the space provided below and shall file with and attach to his/her bid. The undersigned hereby acknowledges receipt of Addendum #1 to the Contract Documents for the City of Nixa Sludge Dewatering Facility Improvements. __________________________ DATE:______________________ BIDDER’S SIGNATURE SHAFFER & HINES, INC. P.O. Box 493, 729 W. Center Circle, Suite 101 Nixa, Missouri 65714 (417) 725-4663 Fax: (417) 725-5230 Page 3 of 3 SLUDGE DEWATERING FACILITY IMPROVEMENTS FOR THE CITY OF NIXA, MO BID FORM Before completing and executing the following Bid Form, each Bidder shall examine the Bidding Requirements, Contract Forms, Supplementary Conditions, Specifications, Drawings, and other proposed Contract Documents, and all Addenda thereto; and shall be acquainted with and fully understanding (1) the extent and character of the work covered by this Bid Form; (2) the location, character and condition of existing roads, streets, highways, railroads, pavements, surfacing, walks, driveways, curbs, gutters, trees, sewers, utilities, drainage courses and structures, and other installations, both surface and underground, which may affect or be affected by the proposed work; (3) the location, arrangement, and specified requirements of the proposed work; (4) the nature and extent of excavations to be made, and the type, character, and general condition of materials to be excavated; (5) the necessary handling and rehandling of excavated materials, including construction of fills and embankments; (6) the location and extent of necessary or probable dewatering requirements; (7) the difficulties and hazards to the work which might be caused by storm or flood water; (8) local conditions relative to labor, transportation, hauling, and rail delivery facilities; and (9) all other factors and conditions affecting or which may be affected by the work. Each bidder shall hereby propose to furnish all materials, equipment, supplies, and appurtenances, to provide all construction equipment and tools; to perform all necessary labor and supervision; and to construct, install, erect, equip, and complete all work stipulated in, required by, and in accordance with the proposed contract documents and the drawings, specification, and other documents referred to therein (as altered, amended or modified by addenda) at the unit or lump sum prices stated on the following next pages. Equipment/materials proposed by the bidder and equipment/materials provided shall meet or exceed the requirements of the specifications, drawings and other contract documents in the opinion of the Owner and Engineer. The listing of manufacturers in the specifications and plans is intended to establish a standard and the words “or equal” if not stated are implied. The naming of a manufacturer in the specifications, plans, addendums, and other contract documents does not constitute a waiver of the specifications or other requirements by that manufacturer, but does recognize the general understanding that the named manufacturer can produce a product meeting the intent of the plans and specifications and may be utilized by the Contractor for bidding in addition to any other manufacturers approval. The Owner reserves the right to reject any proposed equipment/material which does not meet any of the specified requirements and reserves the right to require provision of equipment meeting all the specifications without a change in the bid price. Each Bidder shall include in his/her bid prices any paid up licenses, patent fees or other costs necessary for the use of the equipment and provided materials, if required by the manufacturer. Each Bidder shall fully and accurately complete the following Bid Form and shall provide a unit price (where applicable) and a total price for each item shown. Prices provided shall include all labor, materials, overhead, profit, insurance, mobilization, license fees, and other costs, BF-1 SLUDGE DEWATERING FACILITY IMPROVEMENTS FOR THE CITY OF NIXA, MO BID FORM considerations, and requirements as indicated in the plans, specifications, and other contract documents. Attention of the Bidder is directed to the Instructions to Bidders and Measurement and Payment Sections of the Specifications and Contract Documents in addition to the other contract documents, specifications and construction plans. Execution of this Bid Form by the Bidder affirms the Bidder’s acceptance and understanding thereof. CONTRACT ITEMS: DEWATERING FACILITY IMPROVEMENTS Item No. Lump Sum Item Descriptions and Bid 1.0 Sludge Centrifuge Installation at the Wastewater Treatment Plant Lump sum price to provide sludge feed progressive cavity pump and piping at existing lift station, all required removal and disposal of existing concrete, and grated walkways indicated on the construction drawings and replacement with a reinforced concrete floor slab, providing sludge centrifuge, conveyor, polymer system, elevated walkway, heating and ventilation and all other appurtenances necessary for completion of the requested construction activities. All materials, labor,