624.01 624-1 SECTION 624 DRAINAGE PIPE DESCRIPTION
624.01 This work consists of furnishing and installing pipe defined by class for culverts (cross
drains), side drains, and storm sewers per these specifications and in conformity with the lines and grades shown on the plans or established. MATERIALS
624.02 Materials shall meet the requirements in the Contract and in the following subsections.
Abbreviation Description Subsection CSP Corrugated Steel Pipe 707.02 Bit. Co. CSP Bituminous Coated Corrugated Steel Pipe 707.03
A.F. Bo. CSP Aramid Fiber Bonded Corrugated Steel Pipe 707.03 CAP Corrugated Aluminum Pipe 707.06 PCSP- both sides Precoated Corrugated Steel Pipe coated on both sides with 10 mils minimum 707.10 ALT2 CSP Aluminized Corrugated Steel Pipe Type 2 707.11 RCP Reinforced Concrete Pipe, Type I, II, or V Cement 706.02 NRCP Nonreinforced Concrete Pipe, Type I, II, or V Cement 706.01 Plastic Polyvinyl Chloride (PVC), Polyethylene (PE), Steel Reinforced Polyethylene (SRPE), and Polypropylene (PP) 712.13 All precoated sheet steel for PCSP culvert shall be tested by the manufacturer for coating holidays and certified free of defects. The coating will be visually inspected by the Engineer during construction and all damage found shall be repaired in an approved manner. Connecting bands shall receive the same corrosion protection as the pipe where they are used. Coatings conforming to the requirements of Sections 706 and 707 will be permitted as applicable. Connecting bands and pipe extensions shall be of similar metal, or of non -metallic material, to avoid galvanic corrosion. End sections for concrete or metal pipe shall be the same material as the pipe and meet the requirements for the same class as that specified for the pipe per Table 624- 1. Plastic end sections shall not be used. When plastic pipe is to be installed with end sections, steel or concrete end sections meeting the same class as that specified for the pipe per Table 624-1 shall be used. 624.02 624-2 The Contractor may furnish any pipe material allowed in Table 624 -1 for the class of pipe specified in the Contract except for storm drains. The Contractor may furnish RCP , PVC , SRPE or PP allowed in Table 624 -1 for the class of pipe specified in the Contract for storm drains. The Contractor shall state at the Pre -construction Conference the pipe materials intended to be furnished. Table 624 -1 MATERIALS ALLOWED FOR CLASS OF PIPE Material Allowed** Class of Pipe* 0 1 2 3 4 5 6 7 8 9 10 CSP Y N N N N N N N N N N ALT2 CSP Y Y Y Y Y N N N N N N Bit. Co. CSP Y Y^ N N N N N N N N N
A.F. Bo. CSP Y Y Y Y Y Y Y N N N N CAP Y Y# Y# Y# Y# Y N N N N N PCSP - both sides Y Y Y Y Y Y Y N N N N PVC Y Y Y Y Y Y Y Y Y Y Y PE Y Y Y Y Y Y Y Y Y Y Y PP Y Y Y Y Y Y Y Y Y Y Y SRPE Y Y Y Y Y Y Y Y Y Y Y RCP (SP0) , Y Y N N N N N Y N N N RCP (SP1) , Y Y Y N N N N Y Y N N RCP (SP2) , Y Y Y Y Y N N Y Y Y N RCP (SP3) , Y Y Y Y Y Y Y Y Y Y Y Table 624 -1 Notes: * As determined by the Department per the CDOT Pipe Selection Guide . Determination is based on abrasion and corrosion resistance. ** Y=Yes; N=No. ^Coated Steel Structural Plate Pipe of equal or greater diameter, conforming to Section 510, may be substituted for Bit. Co. CSP at no additional cost to the project. # Aluminum Alloy Structural Plate Pipe of equal or greater diameter, conforming to Section 510, may be substituted for CAP at no additional cost to the project. SP= Class of Sulfate Protection required per subsection 601.04 as revised for this project. RCP shall be manufactured using the cementitious material required to meet the SP class specified. Fo r pipe classes 6 and 10, the RCP shall be coated per subsection 706.07 when the pH of either the soil or water is less than 5. The Contract will specify when RCP is to be coated. Concrete shall have a compressive strength of 4500 psi or greater. Per subsection 712.13 . 624.03 624-3 Where class of pipe specified allows the use of metal pipe, its use will be limited per the resistivity requirements in Table 624 -2. The Contract will state whether the resistivity requirements apply. Table 624 -2 RESISTIVITY REQUIREMENTS FOR METAL PIPES Soil Side Resistivity, R (Ohm – cm) Soil Side pH MINIMUM REQUIRED GAUGE THICKNESS FOR METAL PIPE MATERIAL ≥1500 5.0-9.0 16 Gauge Aluminized Type 2 ≥250 3.0-12.0 16 Gauge Polymer Coated The minimum wall thickness for metal pipe shall be the gauge shown on Standard Plan M -603-1 unless otherwise specified in the Contract. Joint systems for siphons, irrigation systems, and storm drains shall be watertight. Watertight joint systems for plastic pipe shall conform to subsection 705.02. CONSTRUCTION REQUIREMENTS
624.03 Installation shall conform to the requirements of Section 603 or Section 510 as
applicable. Installation for Aluminized Corrugated Steel Pipe Type 2 shall conform to all requirements for Corrugated Steel Pipe (CSP) including the fill height tables and requirements in Standard Plan M - 603-1. Joining and installation of plastic pipe shall conform to ASTM D2321 and the manufacturer's recommendations. METHOD OF MEASUREMENT
624.04 Drainage pipe will not be measured but will be the net length of pipe called for on the
plans, except when field changes are ordered or when there are errors on the plans. In case of exceptions, the quantity to be measured shall be the actual net length of conduit measured along the bottom centerline of the installed pipe. The net length shall include end sections when required. BASIS OF PAYMENT
624.05 The accepted quantities of drainage pipe will be paid for at the contract unit price per
linear foot for the specified size and class. Payment will be made under: Pay Item Pay Unit _____Inch Drainage Pipe (Class__) Linear Foot 624.05 624-4 Structure excavation and structure backfill will be measured and paid for per Section 206. 624.05 624-5 THIS PAGE INTENTIONALLY LEFT BLANK 625.01 625-1 SECTION 625 CONSTRUCTION SURVEYING DESCRIPTION
625.01 This work consists of the construction surveying, calculating, and staking necessary for
the construction of all elements of the project. The work shall be done under the supervision of a Professional Land Surveyor (PLS) or Professional Engineer (PE) who is experienced and competent in road and bridge construction surveying and licensed in the State of Colorado. Locating, preserving, referencing, installing and restoring land monuments such as Primary Co ntrol monuments from which the r ight of way or any land boundary will be calculated, described or monumented, Public Land Survey System (PLSS ) monuments, General Land Office (GLO) monuments, Bureau of Land Management (BLM) monuments, Mineral Survey (MS) monuments , Right -of-way (ROW ) monuments, property boundary monuments, easement monuments, and other monuments that are required by law or regulation to be established by a PLS, and the determination of any land boundary, shall be done per Section 629, under the supervision of a Professional Land Surveyor (PLS) who i s experienced and competent in Right of W ay and boundary surveying and licensed in the State of Colorado. The PLS shall be available to review work, resolve problems, and make decisions in a timely manner. Unless specified otherwise in the Contract, all survey procedures shall be in conformance with the CDOT Survey Manual. If the Revision of Section 102 Project Plans and Other Data states 3D modeling data is available, the Contractor may choose to perform 3D Engineered Construction Surveying (3DECS). 3DECS is the use of global positioning and or robotic instruments to guide construction equipment operations by comparing 3D model information in real time. For 3DECS, either the construction equipment is fed modeling information and makes automatic adju stments (machine control ), or the equipment operator is fed the information and makes physical adjustments. Adobe Sign software shall be used for electronic seals by the Contractor’s Engineer, a Professional Engineer, or a Professional Land Surveyor. Electronic signatures and seals shall comply with the requirements of the Architects, Professional Engineers, and Professional Land Surveyors Rules and Regulations, 4 CCR 730 -1. MATERIALS AND EQUIPMENT
625.02 The Contractor shall furnish all personnel, survey equipment , safety equipment,
materials, and traffic control necessary to perform the required construction surveying and staking. All surveying equipment , including : Total stations, LiDAR scanners, levels, rods, tapes, tripods, tribrachs, and Global Positioning System (GPS) receivers and equipment , shall be checked and calibrated per the CDOT Survey Manual, Chapter 6, Section 6.1.10, and documented in the survey records before the start of work and every six months thereafter. Electronic Distance Measuring Instruments ( EDMI) and total stations shall be checked and calibrated on a National Oceanic and Atmospheric Administration/ National Geodetic Survey
Source: Colorado Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 763–768 of 943.