WSSC_Special_Trench_Restoration_Detail.pdf

This file is a technical specification document for the Washington Suburban Sanitary Commission (WSSC) detailing special trench restoration requirements for paved areas in pipeline construction projects. The document provides standardized details for trench width, pavement restoration, and backfill procedures applicable to the Buckler Road Water Main Replacement project, which involves installing approximately 2.17 miles of water mains across three pipe sizes (0.33 miles of 4-inch, 1.35 miles of 8-inch, and 0.49 miles of 10-inch) and approximately 1.14 miles of water house connections in Clinton, Prince Georges County, Maryland. The project specifies compliance with WSSC Standard Details for various pipe types including rigid pipe gravity RCP sewers, flexible pipe (ductile iron and PVC), and open-cut casing pipes. Sealed responses are required via WSSC's eProcurement Portal prior to 2:00 pm on Wednesday, June 3, 2026.

The specification document mandates jurisdiction-specific pavement restoration standards, requiring contractors to follow Prince George's County Standard Detail STD. 300.18 for work within that jurisdiction, Montgomery County Standard Detail MC-801.02 for Montgomery County work, and State Highway Administration Standard Detail MD 578.01 for state highway areas, with WSSC Standard Detail M/5.2 applied where no jurisdictional requirements exist. All backfill materials, compaction methods, and compaction testing requirements must adhere to WSSC Specification Section 02315 for Earthwork in Pipeline Construction, with final mill and overlay work to be performed by others. The document provides detailed cross-sectional guidance for proper installation depth, finished grade alignment, and restoration of bituminous concrete surface courses and hot mix asphalt base materials.