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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  • Completed

Inflow and Infiltration Reduction Project

The primary goal of CVSan Project No. 97  is to increase the performance of CVSan's wastewater collection system and pump stations to reduce sanitary sewer overflow occurrences (SSO) that could be triggered by inflow and infiltration. The following summarizes the proposed improvements included in this project; eight pipe segments, all in proximity to a storm drain crossing, will undergo repairs, 1,421 linear feet (LF) of full line replacement will occur via pipe bursting, with existing pipe to be replaced with high-density polyethylene pipe, standard dimension ration 17 (HDPE SDR-17), and there will be three deductive spot repairs.

You may view this Project's Notice Inviting Bids, Plans, and Specifications at the links below. Addendum 2 was issued July 20, 2023. Addendum 1 was issued July 7, 2023. Links for the documents related to Addendums 1 and 2 are also below.
This project is scheduled to receive bids on Tuesday, July 25, 2023, at 2:00 p.m., with construction to begin in September 2023. The Project duration is 90 calendar days. The design engineer's estimate for the construction cost of this project is $953,584. If you have any questions regarding the bidding process for this project, please contact us at (510) 756-4200 or via email at kyle@cvsan.org.
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  • Completed

DP 95 Gravity Sewer Repair Project

The primary goal of this repair project was to reduce the possibility of sanitary sewer overflow (SSO) occurrences by increasing the reliability and performance of CVSan’s wastewater collection system and pump stations. The project consisted of  improvements and repairs, 3,481 linear feet (LF) of full line replacement, 15 spot repairs, including seven that are located in easements, one spot repair will occur near an aerial pipeline, six manhole rehabilitations, five manhole installations, and one overflow pipe segment will be abandoned and re-routed with a new main.

The total estimated cost of the project was $988,195.

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  • Completed

Aerial Pipeline and Pump Station Rehabilitation Project

The  construction contract was awarded to Mountain Cascade, Inc. The contractor completed minor repairs at five pump stations. Minor repairs include hatch replacements, float replacements, fall protection anchor points, and electrical bypass. Three pump stations received major repairs. Major repairs include all minor repairs in addition to pipe and valve work, concrete repair, protective coating, and new sewer bypass connections.


The total cost of the project was $1,974,474.

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  • Completed

Flume Recoating Project

The construction contract was awarded to H & R Plumbing. The flume was rehabilitated and re-coated. The flume coating project was part of the Major Structures Rehabilitation 2020-21 Project of the Oro Loma Sanitary District. 

The total project cost was $43,200.
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  • Completed

Santa Maria Avenue/ Redwood Road Sewer Repair Project

The construction contract was awarded to APB General Engineering. This project up-sized the public sewer main line section on Santa Maria Avenue by Mabel Avenue to a 10” high-density polyethylene (HDPE) SDR-17 pipe. Replacement of a sewer main line section near Redwood Road was performed to address a void that was found and determined to be a critical defect. 

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.

The purpose of this project was to optimize treatment p
rocesses at the wastewater treatment plant 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
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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 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

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 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.