- Project Dates: JUL 2013 - ONGOING
- Contract Amount: $98,233
- Civil Engineering
The Veterans Administration (VA) retained SBCC to complete a condition assessment and rehabilitation design of an existing 8-inch and smaller gravity sanitary sewer main and 14 manholes, and dye test or video floor drains to locate storm water tie-ins. Utilities investigation also included water, storm drain, power, communication, fiber optic, steam, and medical oxygen. Subsurface Utility Engineering (Level B, electromagnetic and ground penetrating radar), Geotechnical, Survey, and Condition Assessment of the sewer lines were completed, and the sewer lines were televised (CCTV) in accordance with national (NAASCO) guidelines. SBCC prepared a design to disconnect an exterior stormwater drain from the sewer and tie it into the storm drain system. SBCC prepared two dimension (2D) and three dimension (3D) design drawings and supporting specifications for the replacement or rehabilitation of 2,028 linear feet of sewer (8-inch and smaller), 15 manholes, and lateral connections to eight existing buildings. Following construction completion, a hydraulic analysis of sewers, under existing and proposed conditions, was completed. SBCC evaluated traffic flow and prepared traffic control guidelines. SBCC also prepared a construction cost estimates and will provide construction period services (only task not yet complete due to VA project funding).
The project had some interesting challenges. The facilities were originally constructed in 1929 with cast iron pipe and brick manholes. Through the years, sections of pipe had been replaced with clay and PVC, but most of the PVC repairs were poorly executed and needed to be replaced. The cast iron pipe was severely deteriorated and needed to be replaced as well. In one section, proposed cured in place pipe (CIPP) sewer crossed a broken steam line, which leaked steam into the sewer. SBCC modified the construction specification to control the quality of the CIPP and account for higher temperatures and humidity. Root intrusion was another major issue in much of the sewer, and existing tree removal was included in the sewer design.