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Primary Clarifier Replacement and Expansion Project

Post Date:10/04/2018 11:20 am


Description of Nature and Purpose of Project
The Dublin San Ramon Services District (District) Regional Wastewater Treatment Facility (RWTF) provides secondary treatment of wastewater from within its service area. The RWTF treats wastewater using an activated sludge process. The District intends to construct improvements to the primary treatment system at the RWTF. The Primary Clarifier Replacement and Expansion Project (proposed project) will also include improvements to the grit removal system upstream of the primary sedimentation basins.

The District has determined that these actions constitute a project within the meaning of the California Environmental Quality Act (CEQA), and has concluded that the project fits within the Notice of Determination on a Project for which a Proposed Negative or Mitigated Negative Declaration has been Approved CEQA Guidelines (California Code of Regulations, Title 14, Section 15075 (a) et. seq.).

Purpose of the Project
The purpose of Primary Clarifier Replacement and Expansion Project is to improve the performance of the initial portion of the treatment process in which grit and total suspended solids (TSS) are removed. Testing has determined that the existing grit tanks and primaries are removing TSS below standards of other treatment facilities.  The upgrades are needed to allow efficient treatment of the influent flows, in order to deliver water with appropriate quality to the downstream treatment processes.

Existing Conditions
The project site consists of a fully developed wastewater treatment plant facility, including concrete pads and industrial equipment. The portion of the plant where improvements to the primary sedimentation tanks would be made contains existing grit tanks, existing primary sedimentation tanks, and unutilized areas within the RWTF footprint. All areas where new grit or primary tanks would be constructed is currently paved.

Project Construction
Project construction is anticipated to take place during two construction seasons during 2019 and 2020, and to be completed in January 2021. All construction, including staging, will take place within the footprint of the existing facilities. Because the project site is an existing fully developed facility, no removal of trees or native vegetation will be required during construction of the project, and no disturbance of any undisturbed native soils.

Environmental Declaration

Initial Study/Mitigated Negative Declaration

The Notice of Determination was filed with Alameda County on Oct. 4, 2018.

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