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Pacific Southwest, Region 9

Serving: Arizona, California, Hawaii, Nevada, Pacific Islands, Tribal Nations

City of Manteca

Public Notice for the Draft Finding of No Significant Impact for the City of Manteca

EPA is considering authorizing the expenditure of funds awarded to the City of Manteca (City) to implement a water quality improvement project that would reduce the arsenic concentrations in groundwater pumped through the City’s potable water system and delivered to customers within the City. The City is experiencing high arsenic concentrations from some of its groundwater wells, specifically Wells 12, 15, and 22. The project would result in the construction of a network of pipelines that would connect all three wells to a surface water tank site. Groundwater from the wells would be mixed with surface water at each well site to dilute the concentration of arsenic prior to being delivered to customers. The preferred alternative includes 14,415 linear feet of pipeline and is located entirely within existing roadway alignments. Alternative 1 includes 14,540 linear feet of pipeline and the majority of the pipeline would be constructed in the existing Tidewater bike path alignment. Alternative 2 would involve the construction of well-head treatment facilities at each well site location that would reduce its arsenic concentrations.

In compliance with the NEPA, the EPA has prepared an Initial Study (IS)/Environmental Assessment (EA), which examines the potential environmental impacts of the proposed action and alternatives along with the no action alternative. As a result of the IS/EA, the EPA has determined the proposed action will not have a significant impact on the quality of the human environment.

In compliance with the California Environmental Quality Act (CEQA), the City, as CEQA Lead Agency, proposes to adopt a Mitigated Negative Declaration (MND) for the City of Manteca Arsenic Reduction Project. The IS/EA makes the proposed CEQA findings that, with implementation of the mitigation measures provided, the project will not have a significant effect on the environment.

Interested persons, including those who disagree with this proposal may submit comments to EPA Region 9 within 30 calendar days from the date the IS/EA is issued. No administrative action will be taken on this proposed project prior to the expiration of the comment period which ends on April 10, 2010. Comments, via letter, fax or email, should be sent to Howard Kahan at the address listed below.

Howard Kahan (kahan.howard@epa.gov)
U.S. EPA, Region 9 (WTR-4)
Southern California Field Office
600 Wilshire Blvd. Suite 1460
Los Angeles, CA 90017
Tel: (213) 244-1819
Fax: (213) 244-1850

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