Construction Projects

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  • Current

Operations and Engineering Building - Center Street Project

In 2013 Castro Valley Sanitary District (CVSan) acquired a 73,000-square foot property located at the intersection of Castro Valley Boulevard and Center Street. Learn More
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  • Current

Aerial Pipeline and Pump Station Rehabilitation Project

Castro Valley has 14 aerial pipeline locations, and the maintenance of these lines is crucial for maintaining a healthy watershed. Learn More

The total estimated cost of the project is $1,974,474.
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  • Current

Flume Recoating Project

As part of the project scope for CVSan District Project No. 91, Pump Station No. 4 Force main Replacement and Flume Rehabilitation Project, the Flume structure had defects that were designated to be repaired and recoated. While performing the original project repairs, the contractor discovered that the concrete within the flume was more deteriorated than initially anticipated and that the new coating would not adhere properly. Therefore, this portion of the project was not completed at that time. The final coating has been added as a change order to the Major Structures Rehabilitation 2020-21 Project of the Oro Loma Sanitary District that was awarded to H & R Plumbing to rehabilitate several large collection structures. The flume recoating project will take place in May of 2021.

The total estimated cost of the project is $43,200.
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  • Completed

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. Learn More

The total cost of the project was $98,950.
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  • Completed

Ecotone Project

The Ecotone Project turned a degraded diked bayland behind the Castro Valley/Oro Loma Wastewater Treatment Plant into an outdoor laboratory that protects infrastructure, removes unwanted harmful nutrients from treated wastewater, and provides a renewed habitat for wetland animals. Learn More

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  • Completed

Nutrient Optimization Project

Please enjoy this project video discussing the importance of the Nutrient Optimization Project.

Castro Valley Sanitary District (CVSan) in partnership with Oro Loma Sanitary District (OLSD) completed the Nutrient Optimization Project in 2021 at the Castro Valley/Oro Loma Wastewater Treatment Plant (WWTP).  The purpose of this project was to optimize treatment p
rocesses at the WWTP to improve nutrient removal from wastewater. This project also included the rehabilitation of an existing shallow-water outfall (existing outfall pipelines) to convey secondary treated effluent to the Bay during wet weather events when flows exceed the contractual capacity
. Learn More

The total cost of the project was $24,000,000. (CVSan funded 25%)
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  • Completed

Marshall Street Capacity Improvement/Repair & Rehabilitation Project

The Marshall Street Capacity Improvement/Repair & Rehabilitation Project was implemented based on the findings of the Gravity Sewer Asset Management Plan (GSAMP) and the Master Plan Update. The GSAMP provides a system for CVSan staff to prioritize repairs and pipe rehabilitation projects based on the likelihood of failure and the possible impact of a pipeline failure. The construction contract was awarded to DEI, on May 7, 2019, by Resolution No. 3448. DEI completed six spot repairs, four manhole installations, two full line replacements utilizing open trench, and 17 full line replacements using pipe bursting and horizontal directional drilling.

The total cost of the project was $1,913,339.

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  • Completed

Sandy Road Capacity Improvement Project

Sandy Road Capacity Improvement Project

The Sandy Road Capacity Improvement Project was implemented due to the completion of the Gravity Sewer Asset Management Plan (GSAMP) and the Master Plan Update. The GSAMP provides a system for CVSan staff to prioritize repairs and pipe rehabilitation projects based on the likelihood of failure and the possible impact of a pipeline failure. The construction contract was awarded to Cratus, Inc., on May 2, 2017, by Resolution No. 3401. The contractor completed 13 spot repairs, five manhole installations, two full line replacements utilizing open trench, and 14 full line replacements using pipe bursting. The successful completion of this project was an integral part of CVSan’s continued efforts to fulfill its obligation to eliminate and/or reduce Sanitary Sewer Overflows.

The total cost of the project was $1,623,940.

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  • Completed

Pump Station No. 4 Forcemain Replacement and Flume Rehabilitation Project

The Pump Station No. 4 Forcemain Replacement and Flume Rehabilitation Project replaced aging infrastructure that had been identified as at-risk and install new infrastructure to mitigate foul odors and their associated complaints. The construction contract was awarded to TerraCon Constructors, Inc., on March 7, 2017, by Resolution No. 3397. The contractor completed installing 755 linear feet (LF) of 8” ductile iron pipe by open-cut replacement to re-route the Pump Station No. 4 forcemain and abandoned the existing forcemain in an easement. In addition, the maintenance hatch and concrete flatwork around the hatch at the Flume were replaced and reconstructed, and Manhole Odor Eliminators were installed. 

The total cost of the project was $428,671.