Lay_Schedule_for_30”_.pdf

This is a schedule/layout document for the Washington Suburban Sanitary Commission (WSSC), Maryland, related to a Large Valve Vault Replacement project. The document depicts a technical drawing specification for a DRS Rectangle DRS Callout component measuring 30 inches by 16 inches configured as a TEE connection. This specification is integral to the valve vault replacement project located at 1200 W. University Boulevard in Silver Spring, Montgomery County, Maryland, which involves the replacement of approximately 87 feet of 30-inch water main, 48 feet of 72-inch water main, and one 30-inch valve and vault assembly. Sealed responses for this project were solicited with multiple response deadlines (July 22, 2026; July 29, 2026; and August 19, 2026, all at 2:00 p.m. via WSSC's eProcurement Portal), and construction is anticipated to commence in summer 2025 with completion targeted for fall 2025.

The project requires replacement of existing prestressed concrete cylinder pipe with Class 54 ductile iron water main (30-inch) and 72-inch steel water main with 7/8-inch wall thickness, both featuring external coating and cathodic protection per WSSC standards. The scope includes soil remediation addressing moderately corrosive conditions through PRITEC-coated pipe, cathodic protection systems with insulating joints, five test stations, and multiple zinc anode beds (estimated system cost $42,468.42). Mandatory compliance requirements include Maryland Buy American Steel Act adherence, 100 percent Performance and Payment bonds, and prevailing-wage compliance with prescribed wage rates. The contractor must maintain water service to affected properties through temporary connections limited to 8-hour maximum shutdowns, coordinate utility locates via Miss Utility 72 hours prior to ground disturbance, and manage Sligo Creek Trail access maintenance and restoration at a 1:1 diameter breast height ratio (79 inches total). Payment will be rendered no later than 30 days after receipt of proper invoices, with 5 percent retainage withheld from all payments.