6-20 The upstream end of all completed underdrain pipe shall be seal ed with cement mortar or other acceptable material. Care shall be taken that soil do es not enter the pipe. Pipe contaminated before backfilling shall be removed, cleaned, and re-laid.
b.Underdrain Type C The trench shall be excavated to the widt h and depth as determined by the size and depth of the pipe to be installed. The perforated pipe shall be laid to line and grade centered on the bottom of the trench with the perforations as shown on the Standard Detail plans. After the pipe has been firmly bedded and all joints securely c onnected, it will be inspected before any backfill is placed. The backfill shall be placed in accordance with Section 603.08 and as shown on the Standard Detail plans using the materials specified. When Underdrain Type B or Underdrain Type C is constructed, ba ckfill material beyond the underdrain trench lateral limits designated on the p lans shall be material conforming to the requirements of Granular Borrow, Underwater B ackfill. Material within the underdrain trench limits shall conform to the requirements of the type underdrain being constructed. The Contractor shall take precautions to prevent the underdrain backfill material from becoming contaminated with clay, silts, organic m atter, or other foreign matter. Methods of placing backfill material shall be limited to the use of equipment that will place material directly into the trench. Pushing material into the trench will not be allowed. When underdrain is to be constructed in embankment fill, the e xcavation for the trench shall be done after the embankment has been completed to subgrade elevation.
605.05 Underdrain Outlets Trenches for underdrain outlets sha ll be excavated to the
required width and depth. These outlets shall be of the same s ize and wall thickness used in the underdrain, except that the perforations may be omitted. The pipe shall be laid in the t rench with all ends firmly joine d by the applicable methods and means. After inspection and approval of the pipe installat ion, the trench shall be backfilled with suitable material in layers and compacted as pr ovided for in Section 603.08.
605.06 Method of Measurement Underdrain and underdrain outlets will be measured by
the length in linear feet along the centerline of underdrains a nd underdrain outlets of the types and sizes completed and accepted. When elbows, tees, wyes, or other special fittings are require d in underdrain, each fitting shall be included for payment as 3 additional linear fe et of the largest pipe size involved.
605.07 Basis of Payment The accepted quantities of underdrains and underdrain outlets
will be paid for at the contract unit price per linear foot of each type and size specified 6-21 complete in place. Outlet pipe for Underdrain, Type C will be paid for under Section 603 - Pipe Culverts and Storm Drains. Within and beyond the trench limits, backfill, couplings and b ands and other related items will not be paid for separately, but shall be considered included in the unit bid price for the type of underdrain being installed. Excavation will be considered incidental, except as provided i n Section 206 - Structural Excavation. No allowance for payment will be made f or excavating or material excavated beyond the horizontal dimensions shown for Underdrain , Type B or Underdrain, Type C. Payment will be made under: Pay Item P a y U n i t
605.09 6 inch Underdrain Type B Linear Foot
605.10 6 inch Underdrain Outlet L i n e a r F o o t
605.11 12 inch Underdrain Type C L i n e a r F o o t
605.12 15 inch Underdrain Type C L i n e a r F o o t
605.13 18 inch Underdrain Type C L i n e a r F o o t
605.14 21 inch Underdrain Type C L i n e a r F o o t
605.15 24 inch Underdrain Type C L i n e a r F o o t
605.17 30 inch Underdrain Type C L i n e a r F o o t
605.18 36 inch Underdrain Type C L i n e a r F o o t
SECTION 606 – GUARDRAIL
606.01 Description This work shall consist of furnishing and i nstalling guardrail
components in accordance with these specifications and in reaso nably close conformity with the lines and grades shown on the plans or as established. The types of guardrail are designated as follows: Type 3-Galvanized steel "w" beam, wood posts or galvanized stee l posts. Type 3a-Galvanized steel "w" beam, wood posts, wood or composit e offset blocks. Type 3aa-Corrosion resistant steel "w" beam, wood posts, wood o r composite offset blocks. Type 3b-Galvanized steel "w" beam, galvanized steel posts, galv anized steel offset blocks. Type 3c-Galvanized steel "w" beam, wood posts or galvanized ste el posts, wood or composite offset blocks.
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 490–491 of 817.