25PW15 - Drawings.pdf

This is an engineering drawing set for the Parrott Creek Culvert Replacement project in the City of Roseburg, Oregon. The project involves the replacement of four existing corrugated metal pipe (CMP) culverts with new precast concrete three-sided culverts across four street locations: Eddy Street (80 feet of culvert, 14' wide x 7' tall), Kane Street (30 feet, 14' wide x 6' tall), Giles Street (35 feet, 14' wide x 6' tall), and Ichabod Street (40 feet, 14' wide x 6' tall). The drawings provide comprehensive construction details including site plans, erosion control and planting plans, wall layouts, storm sewer details, and temporary water management phasing. Key construction elements include installation of precast strip footings, ULTRABLOCK MSE retaining walls with 4-foot chainlink fencing, engineered streambed material, permanent seeding with native plant species, storm sewer connections with Contech Stormfilter catchbasins, and standard curbing. The project includes protection of existing utilities (sanitary sewer lines, water mains, and gas lines), coordination with property owners regarding access, and adherence to a July 1 to September 15 in-water work window.

The construction documents specify compliance with the 2024 Edition of the Standard Specifications for Construction prepared by the Oregon Department of Transportation and the American Public Works Association. Trench backfill requirements include Class B material within street rights-of-way and parking lots, with compaction testing mandated on all mainline trenches and base rock materials. The contractor is responsible for obtaining all required permits, contacting the Oregon Utility Notification Center at least 48 hours prior to construction, and managing survey monument replacement. Materials containing asbestos may be present in existing underground pipe systems and must be handled according to Oregon Department of Environmental Quality regulations, with friable asbestos removal performed only by DEQ-licensed contractors. Standard specifications address concrete strength requirements (4,000 PSI for driveways, 3,300 PSI for sidewalks), asphalt pavement specifications (Level 2 dense HMAC), horizontal separation distances between water and sewer mains (minimum 10 feet), and installation of insulated copper toning wire in all trenches with pipe placement.