Document Title Mocho Groundwater Demineralization Project M N D
Type Mitigated Negative Declarations
SCH# 2006022139
County Name Alameda ( North / Coastal CA Region )
Lead Agency Zone 7 Water Agency
The proposed project consists of construction and operation of a 7.7 mgd demineralization facility, which would be located adjacent to Arroyo Mocho off Stoneridge Drive and Santa Rita Road in the city of Pleasanton, California. The facility would treat potable water supplies from existing wells in the vicinity. Operation of the proposed facility would consist of demineralization or reverse osmosis treatment of source or raw water from the water wells. Reverse osmosis (RO) is a physical separation process, in which water is pressurized and passed through a semi-permeable membrane. Molecular constituents (i.e., calcium, magnesium, sodium, etc.) larger than the molecular pore size of the membrane do not pass through, and exit the membrane system as concentrate. Demineralized water molecules pass through the membrane and exit the system as permeate or product. Demineralization would occur through the use of an RO membrane-based treatment, producing permeate water and concentrate. Zone 7 would blend permeate with other groundwater (non-demineralized) and/or surface water before delivery to achieve a target total dissolved solids or hardness level. The concentrate solution resulting from the RO process would be discharged into San Francisco Bay via the existing Dublin San Ramon Services District (DSRSD) pipelines, the Clean Water Revival (CWR) pipeline, and the Livermore Valley Water Management Agency (LAVWMA) pipeline. The LAVWMA pipeline connects to the existing East Bay Dischargers Authority (EBDA) outfall into the Bay.

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