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Santa Maria Avenue/ Redwood Road Sewer Repair Project
Santa Maria Avenue/ Redwood Road Sewer Repair Project
CVSan knows that investment in infrastructure is key to having a high-quality sewer system that protects our community and environment. CVSan uses specialized closed-circuit television (CCTV) equipment to inspect our wastewater sewer mains. The video surveillance helps to find defects in the sewer lines and enables us to collect detailed data about the underground collection system. CCTV footage identified excessive inflow and infiltration (I&I) in a section of the public sewer main located on Santa Maria Avenue. I&I has the potential to overload the Wastewater Collection System and cause sanitary sewer overflows. CCTV footage also identified a large void in a section of the public sewer main located on Redwood Road. Voids are considered a critical defect and must be repaired to maintain the integrity of the sewer system and avoid sanitary sewer overflows. This repair project will correct these issues and ensure the proper functioning of the system.
Who: CVSan
APB General Engineering
- Main office is located at 1036 Oak Grove Rd, Concord, CA 94518. APB General Engineering has completed numerous sewer repairs throughout the Bay Area. This is the first time CVSan has worked with this contractor.
BFK Engineers
- BKF Engineers has offices all throughout the Bay Area. CVSan has worked with BKF in the past for the District Project No. 92, Annual Repair and Rehabilitation/Sandy Road Capacity Improvement Project, and BKF currently serves as the CVSan On-Call Engineer.
When: November 2020
Cost: $98,950
Santa Maria Avenue:
As part of the project scope for CVSan District Project No. 92, Annual Repair and Rehabilitation/Sandy Road Capacity Improvement Project, the public sewer main line section on Santa Maria Avenue by Mabel Avenue was designed to be upsized to a 10” High-density polyethylene (HDPE) SDR-17. This public sewer main line section was identified as having a large amount of inflow and infiltration (I&I) due to the nearby storm drain crossing, which was identified through closed-circuit television (CCTV) inspection. During a previous repair to this section, the contractor discovered that a portion of the existing 8” VCP pipe was directly below and potentially partially encased in the concrete base underneath the 60” storm line. The contractor did not want to risk breaking in the concrete in the event that it would damage the integrity of the culvert, so the 8” VCP was left while the rest of the public sewer main pipe was changed and upsized to 10” HDPE. This project will finish the upsizing of the 8” VCP pipe.
Redwood Road:
While performing a CCTV inspection for the public sewer main line section near Redwood Road, CVSan staff discovered a large void in the pipe that was deemed as a critical defect. The public sewer main line section also contains several sags that need correcting.