DESCRIPTION
608.01.01 General. This work consists of furnishing and installing embankment protectors, downdrain pipe,
anchor assemblies, metal end sections , geotextile, and riprap. Lengths of downdrain pipe shown on the plans are approximate. Do not order and deliver the downdrain pipe until it is staked in the field and a list of lengths and pipe angles is furnished by the Engineer. MATERIALS
608.02.01 General. Material shall conform to the following Sections and Subsections :
Portland Cement Concrete ................................ ..................................................................................................................... Section 501 Reinforcing Steel ................................ .................................................................................................................................... Section 505 Riprap .................................................................................................................................................................................... Section 610 Smooth Wall Polyethylene Pipe ......................................................................................................................... Subsection 708.03.04 (a) Corrugated Polyethylene Pipe ................................ ................................ ............................................................ Subsection 708.03.04 (b) Corrugated Steel Pipe ............................................................................................................................................. Subsection 709.03.01 Corrugated Aluminum Pipe ..................................................................................................................................... Subsection 709.03.02 Anchor Assemblies for Downdrains ................................ ......................................................................................... Subsection 709.03.03 Geotextile (Class 2) ................................ ................................................................................................................. Subsection 731.03.03 Downdrain pipe may be corrugated steel, corrugated aluminum, or one of the plastic types specified above. Metal pipe plate thickness shall be 1.6 mm (16 gage) for steel and 1.5 mm (16 gage) for aluminum unless otherwise noted on the plans. Except as hereinafter provided, assemble each separate downdrain installation from one material only. Electrically insu late anchor assemblies used with an aluminum installation. Connect plastic pipe to metal end sections according to the manufacturer’s recommendations. Repair any damaged galvanized coating on corrugated steel parts according to Subsection 604.02.01. Metal end sections shall conform to the details and dimensions shown in the plans and, except for shape, shall conform to the requirements for corrugated metal pipe. Metal grates and frames shall conform to Section 609. CONSTRUCTION
608.03.01 General. Structure excavation and backfill shall conform to Sections 206 and 207.
Construct concrete inlet structures according to Sections 501 and 502. Construct riprap apron as shown on the plans. Connect metal pipe sections by means of band couplers. Connect plastic pipe sections according to Section 605. METHOD OF MEASUREMENT
608.04.01 Measurement. Embankment protectors, metal end sections, and anchor assemblies will be
measured by the each. Downdrain pipe will be measured by the linear meter (linear foot) . Structural steel grates for embankment protectors will be measured and paid for according to Section 609. 608 DOWNDRAINS Pipe elbows, wyes, tees, and other branches will be measured and paid for by the linear meter (linear foot) for the size and type of pipe involved. Wyes, elbows, tees, and other branches will be measured as pipe along centerlines to the point of intersection. Structure excavation, granular backfill, geotextile, and riprap shall be considered as included in the price paid for other items of work in this Section, and no separate payment will be made therefore. BASIS OF PAYMENT
608.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contract
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment will be made under: Pay Item Pay Unit Embankment Protector (type) ................................ ............................................................................................................................ Each Anchor Assembly (size) ................................ ..................................................................................................................................... Each (size) Downdrain Pipe ...................................................................................................................................... Linear Meter (Linear Foot) (size) Metal End Section (Downdrain) ............................................................................................................................................... Each SECTION 609 INLETS AND MANHOLES DESCRIPTION
609.01.01 General. This work consists of constructing or reconstructing inlets, manholes, and similar
structures. MATERIALS
609.02.01 General. Material shall conform to the following Sections and Subsections:
Portland Cement Concrete ................................ ..................................................................................................................... Section 501 Reinforcing Steel ................................ .................................................................................................................................... Section 505 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 Miscellaneous Metal ................................ ............................................................................................................................... Section 712 Gray Iron Castings .................................................................................................................................................. Subsection 712.03.02 Portland cement concrete shall be Class A or Class AA unless otherwise provided. Precast manhole materials shall conform to AASHTO M199 (ASTM C478). Tongue and groove joints and gasket ed joints shall conform to Subsection 707.03.02. Concrete for concrete collars placed around manholes, valves, covers, etc., shall be a fast -setting concrete when required as specified in Subsection 609.03.02. Use fast -setting concrete products listed in the QPL. Mix mortar for setting grates in the proportions of 1 part Portland cement to 3 parts of mortar aggreg ate by volume. Add only enough water to permit placing and packing of the mortar. Supply castings true to pattern in form and dimensions, free from pouring faults, sponginess, cracks, blow holes, and other defects in positions affecting strength and value for the service intended. Boldly fillet at angles and make sharp and perfect ar rises in castings. Sand blast or otherwise effectively clean castings of scale and sand so as to present a smooth, clean, and uniform surface. Castings of frames, grates, rings, and covers for inlets, manholes, and other structures shall meet H -20 loading requirements according to AASHTO M306. Pipe crossbars for drop inlets shall be standard weight black pipe conforming to ASTM A53. Structural steel for grates and frames for drop inlets shall conform to ASTM A36. Do not paint or galvanize grates, frames, or castings. CONSTRUCTION
609.03.01 General. Construct inlets and manholes according to Section 502. Place inlet and outlet pipes before
pouring concrete. Manhole sections shall be installed with tongue and groove joints or gasket ed joint s. Manholes specified to have watertight joints shall be installed with gasket ed joints . Install manhole sections, sealants , and gaskets as specified by the manufacturer. Submit a copy of t he manufacturer’s installation instructions prior to installation . Lubricate gaskets requiring lubricant with the lubricant recommended by the manufacturer . Precast inlets and manholes that require the diversion of public traffic during their construction. Do not begin excavations required for such structures until the structures have been precast, cured, and are ready for installation. Once installation has been commenced, continuously work on a working day by working day basis thereon until such time as public traffic is allowed the use of the area as approved. For restrictions on when to construct inlets or manholes to final grade see Subsection 613.03.06. Set grates in ful l mortar beds or otherwise secure as shown on the plans. Set grates accurately to the final elevations. Construct concrete covers to fit snugly and be readily removable.