610.3(c) 610.4(i) roadway pavement edge as shown on the Standard Drawings . Construct trench without disturbing the pavement structure or subbase. Unless otherwise indicated or directed, provide trench having a width as shown on the Standard Drawings and a depth extending at least 2 inches into the subgrade.
shown on the Standard Drawings . Place the first lift of backfill material simultaneously with drain install to ensure complete contact with the geotextile and the trench wall. Repair any tears in the geotextile according to the manufacturer’s recommendation. If raised core projections protrude from only one side of the drain, place the projections toward the pavement side of the t rench. Backfill the trench with fine aggregate, Type A using 9 -inch (maximum) hydraulically compacted lifts. Spray each lift with water at 1.0 gallon per linear foot. Ensure that excavation, drain placement, and backfill operations are performed in sequence, with a minimum amount of trench open at all times. Do not leave trenches greater than 2 inches in depth open overnight. Barricade trenches at all times according to the requirements of 67 PA Code, Chapter 203. If shoulder restoration is indicated, follow applicable specifications and standards to reconstruct the existing shoulder as specified in the contract documents.
restrict flow. Follow the manufacturer's approved connection details. Do not allow backfill material to enter the connector at any point. For drainage cores that splice using male -to-female o verlapping, roll back the geotextile onto the in -place drainage core, make the splice, and rewrap the geotextile over the completed joint. Provide a minimum of 6 inches of geotextile overlap from one section to the next. Install subsurface drain outlet pipe and fittings as specified in Section 615.3, concurrently with the pavement base drain, to establish positive drainage within 24 hours of the beginning of trenching for the installation of a given section of base drain. The Representative may restrict installation of additional sections of base drain until acceptable outlet installations are completed. Ensure transitions are smooth and non -restricting to flow. Do not use “home -made” connections. Install all fittings and connections to preclude soil intrusion into the drainage core or outlet piping and to provide continuity of drainage flow. Install fittings for positive, gravity flow, and outlet the drainage system as indicated or as directed. Fur nish outlet pipes with galvanized wire mesh shields as shown on the Sta