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HomeMy WebLinkAboutBID - 7655 REINFORCED CONCRETE PIPE ITEMS FOR EAST PITKIN STREET STORM SEWER IMPROVEMENTS PROJECTAddendum 1 7655 Reinforced Concrete Pipe Items for East Pitkin Street Storm Sewer Improvements Project Page 1 of 2 ADDENDUM NO. 1 SPECIFICATIONS AND CONTRACT DOCUMENTS Description of BID 7655: Reinforced Concrete Pipe Items for the East Pitkin Street Storm Sewer Improvements Project OPENING DATE: 3:00 PM (Our Clock) June 13, 2014 To all prospective bidders under the specifications and contract documents described above, the following changes/additions are hereby made and detailed in the following sections of this addendum: Exhibit 1 – Questions & Answers Exhibit 2 – Specifications Please contact Pat Johnson, CPPB, Senior Buyer at (970) 221-6816 with any questions regarding this addendum. RECEIPT OF THIS ADDENDUM MUST BE ACKNOWLEDGED BY A WRITTEN STATEMENT ENCLOSED WITH THE BID/QUOTE STATING THAT THIS ADDENDUM HAS BEEN RECEIVED. Financial Services Purchasing Division 215 N. Mason St. 2nd Floor PO Box 580 Fort Collins, CO 80522 970.221.6775 970.221.6707 fcgov.com/purchasing Addendum 1 7655 Reinforced Concrete Pipe Items for East Pitkin Street Storm Sewer Improvements Project Page 2 of 2 EXHIBIT 1 – QUESTIONS & ANSWERS 1. The time for the bid opening on the City of Fort Collins’ BuySpeed System says 4:07 pm, but the Invitation to Bid says 3:00 pm. Which is correct? The correct time is 3:00 pm on the 13th of June. 2. I am not able to find Specification 02610-storm drainage pipe on the site that was referenced in the document, please provide. The specification is attached as Exhibit 2. DEVELOPMENT Storm Drainage Pipe SECTION 02610 STORM DRAINAGE PIPE PART 1 GENERAL 1.01 SECTION INCLUDES A. This Section includes construction of pipe for storm drainage systems, including appurtenances normally installed as a part of these systems. Construction may include surface preparation; trench excavation; shoring; dewatering; laying, aligning and joining pipe, installation of appurtenances; bedding and backfilling; surface restoration; and, other related work. 1.02 RELATED SECTIONS A. Section 02240 – Water Control and Dewatering B. Section 02225 – Trenching, Bedding and Backfill. 1.03 QUALITY CONTROL A. All pipe shall be inspected by the Engineer/Utility prior to installation. B. All pipe which does not meet the requirements of Part 2 of this section will be rejected and replaced. C. Applicable Standards 1. Non-Reinforced Concrete Pipe, ASTM C 14 2. Reinforced Concrete Pipe, ASTM C76 3. Reinforced Concrete Arch Pipe, ASTM C508 4. Reinforced Concrete Elliptical Pipe, ASTM C507 5. Aluminized Corrugated Steel Pipe (Type II), AASHTO M 274 (Note: Helical corrugations should be used whenever possible.) 6. Corrugated Aluminum Pipe, AASHTO M 196 (Note: Helical corrugations should be used whenever possible.) 7. Type PSM Poly Vinyl Chloride (PVC) Pipe, ASTM D 3034 8. Plastic and Polyethylene (PE) Corrugated Pipe a. ADS – N-12, ASTM D3212. Joints shall meet or exceed ASTM 3212 lab test and ASTM C969 watertight field test. EXHIBIT 2 - SPECIFICATIONS DEVELOPMENT Storm Drainage Pipe b. A-2000 PVC, ASTM F949 with minimum of 46 pipe stiffness for all diameters. 9. Arylonitrite-Butadiene-Styrene (ABS) Pipe, ASTM D 2680 & D 2751 10. Ductile Iron Pipe, ANSI A 21.51 (AWWA C 151) 11. Steel Reinforced High Density Polyethylene Pipe a. DuroMaxx® - ASTM F-2562 “Standard Specification for Steel Reinforced Thermoplastic Ribbed Pipe and Fitting for Non- Pressure Drainage and Sewerage” or AASHTO Designation MP- 20. 1.04 UNDERDRAINS OR SUBDRAINS A. Shall be designed by a Licensed Engineer or Geotechnical Engineer experienced in the design of this type of improvement. PART 2 PRODUCTS 2.01 MATERIALS A. Unless otherwise specified by these standards or the Engineer/Utility, manufacturing, testing, inspection, marking, and acceptance of the storm sewer pipe and related products shall be in accordance with the standard specifications listed in this Section. Limitations for the use of pipe materials are outlined in the City of Fort Collins Storm Drainage Design Criteria. B. The Contractor shall install storm sewer pipe of the type, diameter, load class, wall thickness and protective coating that is shown on the Construction Drawings. All pipe and appurtenances used shall conform to the following requirements: C. Precast Concrete Pipe 1. General: Precast concrete pipe which does not conform to the applicable ASTM Standard Specifications listed below or to any other requirement specified herein will not be approved for the storm sewer installations. 2. Allowable ASTM Specifications: All material, manufacturing operations, testing, inspection, and making of concrete pipe shall conform to the requirements of the appropriate allowable ASTM Standard Specifications, latest revision thereof, listed below: ASTM C-14 - Concrete Sewer, Storm Drain, and Culvert Pipe ASTM C-76 - Reinforced Concrete Culvert, Storm Drain and Sewer Pipe DEVELOPMENT Storm Drainage Pipe ASTM C-361 - Reinforced Concrete Low-Head Pressure Pipe 3. Diameter of Pipe: The diameter indicated on the Construction Drawings shall mean the inside diameter of the pipe. 4. Wall Thickness and Class of Pipe: The wall thickness and reinforcing steel, if any, shall comply with the appropriate ASTM Specification and the class of pipe designated on the Construction Drawings. No elliptical reinforcing will be allowed in any circular pipe. 5. Fittings and Specials: Details of all fittings and specials shall be furnished for approval by the Engineer/Utility. Fittings and specials shall be made up of pipe segments having the same structural qualities as the adjoining pipe and shall have the interior treated the same as the pipe. 6. Lifting Holes: Lifting holes will be allowed for storm sewer pipe provided, however, only two lifting holes per pipe length will be allowed and all pipe shall be installed such that the lifting holes are in the crown of the pipe. All lifting holes shall be properly grouted with cement mortar immediately after the pipe is installed prior to commencement of any backfilling. 7. Cement: Unless otherwise required by the Engineer/Utility, or specified otherwise on the Construction Drawings, Type II Modified Portland Cement complying with the requirements of ASTM Designation C-150 will normally be acceptable in the manufacture of concrete pipe. 8. Acceptance: In addition to any deficiencies not covered by the applicable ASTM Specifications, concrete pipe which has any of the following visual defects will not be accepted: a. Porous spots on either the inside or the outside surface of a pipe having an area of more than 10 square inches and a depth of more than 1/2 inch. b. Pipe which has been patched to repair porous spots, cracks, or other defects, when such patching was not approved by the Engineer/Utility. c. Exposure of the reinforcement when such exposure would indicate that the reinforcement is misplaced. d. Pipe that has been damaged during shipment or handling even previously approved before shipment. e. Concrete pipe, at delivery to the job site, will be at least 5 days (120 hours) old. f. Fractures or cracks passing through the wall, except for a single end crack that does not exceed the depth of the joint. DEVELOPMENT Storm Drainage Pipe g. Defects that indicate imperfect proportioning, mixing, and molding. h. Surface defects indicating honeycombed or open texture. i. Damaged or cracked ends where such damage would prevent making a satisfactory joint. j. Any continuous crack having a surface width of 0.01 inch (0.25 mm) or more extending for a length of 12 inches (310 mm) or more, regardless of position in the wall of the pipe. k. Acceptance of the pipe at point of delivery will not relieve the Contractor of full responsibility for any defects in materials due to workmanship. 9. Marking: The following shall be clearly marked on both the interior and exterior surface of the pipe: a. ASTM and AASHTO specifications b. Class and Size c. Date of Manufacturer d. Name or Trademark of Manufacturer 10. Joints: The joint design for concrete pipe shall be bell and spigot. The bell shall be grooved to properly contain and seat the rubber gasket. The joint assemblies shall be accurately formed so that when each pipe section is forced together in the trench the assembled pipe shall form a continuous watertight conduit with smooth and uniform interior surface, and shall provide for slight movement of any piece of the pipeline due to expansion, contraction, settlement or lateral displacement. The gasket shall be the sole element of the joint providing water tightness. The ends of the pipe shall be in planes at right angles to the longitudinal centerline of the pipe, except where bevel-end pipe is required. The ends shall be furnished to regular smooth surfaces. All joints and jointing material shall conform to the following minimum requirements. Jointing material used shall be indicated on the Construction Drawings. a. Rubber gasket joints for bell and spigot pipe shall consist of an O- ring rubber gasket or other approved gasket configuration and shall conform to the requirements of the appropriate ASTM Specification of the pipe designated. Unless otherwise approved by the Engineer/Utility the standard joint configuration shall be similar and equal to the Bureau of Reclamation’s “R-4” joint designation. Joints shall be in accordance with ASTM C 76. DEVELOPMENT Storm Drainage Pipe Gaskets: Gaskets may be either natural rubber or neoprene conforming to ASTM Designation C-443 and AASHTO M 198. All gaskets shall be stored in a cool place, preferably at a temperature of less than 70 degrees Fahrenheit (F.), and in no case shall the gaskets be stored in the open, or exposed to the direct rays of the sun. No gaskets that show signs of deterioration, such as surface cracking or checking, shall be installed in a pipe joint. The neoprene gaskets used when the air temperature is 10F or lower, shall be warmed to temperature of 60F for a period of 30 minutes before being placed on the pipe. b. If the average joint gap in 36-inch diameter pipe or larger pipe exceeds ¾-inch, the void shall be filled and troweled smooth with an approved non-metallic, non-shrink grout conforming to ASTM C-827 or flexible plastic sealant conforming to Federal Specification SS-S- 00210 so to provide a smooth interior surface at the joint. For pipe sizes 18-, 24-, 27-, 30-, and 36-inch in diameter, the reinforcement in the bell and spigot shall conform to ASTM C-76 for the class of pipe specified or to ASTM C-361 for a minimum pressure head of 25 foot, whichever is greater. 11. Protective Coatings: Normally, no additional exterior or interior protective coatings will be required for concrete pipe. However, whenever adverse corrosive conditions warrant additional interior protection, those pipe segments will be noted on the Construction Drawings. D. Metal Pipe 1. Joints for metal pipe shall meet the requirements in Article 1.03, above. 2. Connector bands shall have the same corrugations as the pipe unless otherwise specified. 3. Acceptance: In addition to any deficiencies not covered by the applicable Specifications, as listed above, metal pipe which has any of the following defects will not be accepted: a. Uneven laps b. Elliptical shaping c. Variation for a straight center line d. Ragged or diagonal sheared edges e. Loose, unevenly lined or spaced rivets or spot welds f. Poorly formed rivet heads or locked seams g. Unfinished ends h. Illegible brand i. Lack of rigidity j. Bruised, scaled, or broken spelter coating k. Dents or bends in the metal itself that damage it structurally DEVELOPMENT Storm Drainage Pipe E. Fittings and Specials 1. Fittings and specials shall be made of pipe segments having the same structural qualities, corrugations (where applicable), and coatings as the adjoining pipe. 2. Details of fittings and specials shall be approved by the Engineer/Utility before construction. F. Underdrain or Subdrain Pipe 1. Subdrain pipe shall meet the requirements of Article 1.03, above, except that metal pipe shall not be used. 2. Perforations for subdrain pipe shall be in conformance with the manufacturer’s and Design Engineer’s recommendations. Subdrain pipe shall have the bottom ¼ of the pipe without perforations. G. Steel Reinforced High Density Polyethylene Pipe 1. Resins shall conform to the minimum requirements for cell classification 345464C as defined and described in the latest version of ASTM D3350 “Standard Specification for Polyethylene Plastic Pipe and Fittings Materials”. 2. Pipe lengths shall be joined on site using bell & spigot, or ElectroFusion couplers especially designed for DuorMaxx pipe. 3. Joints: a. High Performance (HP) Joints shall be gasketed, bell and spigot joints where both the bell and spigot are reinforced with steel that is fully encased in stress-rated high density polyethylene and thsat have been laboratory tested to 15 psi when tested in accordance with ASTM D3212 “Standard Specification for Joints for Drain and Sewer Plastic Pipes Using Flexible Elastomeric Seals. b. ElectroFusion (EF) Joints shall utilize plain ended DuroMaxx pipe welded together utilizing exclusive pressure testable ElectroFusion couplers. The welded connections provide a true in-field water tight system assured by the pressure testable welded sleeves at each welded connection. The field installed ElectroFusion joints shall remain watertight with a zero leakage rate up to a test pressure of 30 psi. 4. Fittings: a. All fabricated fittings and couplings supplied by the manufacturer shall be constructed to ensure no loss of structural integrity or joint tightness at welded seams and joints. Only those fittings supplied by or recommended by the manufacturer shall be used. DEVELOPMENT Storm Drainage Pipe H. Plastic and Polyethylene (PE) Corrugated Pipe 1. ADS – N-12, dual wall high-density polyethylene pipe shall have a smooth interior wall and corrugated exterior and meet a full 10.8 psi. Joints shall meet or exceed ASTM 3212 lab test and ASTM C969 watertight field test. a. Fittings shall be manufactured by Nyloplast Engineered Surface Drainage Products b. Or An Approved Equal. 2. A-2000 PVC with minimum of 46 pipe stiffness for all diameters. PART 3 EXECUTION 3.01 SURFACE PREPARATION A. Reference Section 02100 – Site Preparation 3.02 DEWATERING A. Reference Section 02240 – Water Control and Dewatering 3.03 LAYING, ALIGNING, AND JOINING PIPE A. Reference Section 02713 – Wastewater Collection System 3.04 BEDDING AND BACKFILLING A. Reference Section 02225 – Trenching, Bedding and Backfill 3.05 ENCASEMENT AND CRADLES Concrete for encasements shall be as specified in Section 03310. Prior to placing the concrete for the cradles or encasement, temporary supports consisting of concrete blocks or bricks shall be used to support the pipe in place. Not more than two supports shall be used for each pipe length, one adjacent to the shoulder of the bell and the other near the spigot end. No encasement shall be poured until the Engineer/Utility has inspected and approved the pipe to be encased and its supports. All ditch crossings shall be constructed in accordance with the Specifications and the Construction Drawings. Written approval of the irrigation company must be obtained prior to the crossing of any irrigation ditch. DEVELOPMENT Storm Drainage Pipe 3.06 GRATES FOR PIPES AND HEADWALLS When called for on the Construction Drawings, grates shall meet the following requirements: A. Grating shall be constructed of steel bars with a minimum diameter of 5/8”. Reinforcing bars shall not be used. B. Welding connections shall be ¼” minimum. C. Spacing between bars shall normally be five inches (5”) unless site conditions are prohibitive. D. All exposed steel shall be galvanized in accordance with AASHTO M 111. E. Welded joints shall be galvanized with a rust preventive paint. F. Grates shall be secured to the headwall or end section by removable devices such as bolts or hinges to allow maintenance access, prevent vandalism, and prohibit entrance by children. 3.07 SURFACE RESTORATION A. All streets, alleys, driveways, sidewalks, curbs or other surfaces broken, cut or damaged by the Developer shall be replaced in kind or as shown on the Construction Drawings. 3.08 CONCRETE CUTOFF COLLARS A. Concrete shall meet the requirements of Section 03310. 3.09 UNDERDRAIN OR SUBDRAIN PIPE A. Underdrains/subdrains shall only be tied into storm sewer manholes, back or sides of stormwater inlets, or discharged directly to drainage channels or water courses. 1. Penetrations at tie-ins must be grouted to prevent water from entering the manhole or inlet from around the exterior of the pipe. B. Cleanouts shall be designed at regular intervals so the pipe can be cleaned from the surface over the pipe. 3.10 STEEL REINFORCED HIGH DENSITY POLYETHYLENE PIPE A. Installation shall be in accordance with ASTM D2321 “Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications” along with product-specific recommendations for DuroMaxx pipe. END OF SECTION