NOTICE OF INSIGNIFICANT PROJECT CHANGE (Temporary Concrete Batch Plant) COSUMNES POWER PLANT PROJECT (01-AFC-19C) [California Energy Commission Seal]

(Temporary Concrete Batch Plant)

The Cosumnes Power Plant (CPP) project is a nominal 1000 megawatt (MW) natural gas-fired, combined-cycle electric generating facility located approximately 25 miles southeast of the City of Sacramento, in Sacramento County. The Sacramento Municipal Utility District (SMUD), project owner and operator, is proposing to construct the project in two 500 MW phases. The total project will be located on approximately 30-acres of an overall 2,480-acre parcel owned by SMUD.

Phase 1 of the project was certified on September 9, 2003, and commenced construction on October 31, 2003. SMUD will decide at a later date whether or not to seek approval to proceed with the construction of Phase 2.

On December 16, 2003, the Energy Commission staff received a petition from SMUD to modify the project as follows:

DESCRIPTION OF PROPOSED MODIFICATIONS: In an effort to provide a better quality concrete at a lower cost, SMUD is seeking approval to use a portable/temporary batch plant during the foundation construction phase. The batch plant will be located on a two-acre parcel in the northeast corner of the adjacent Rancho Seco property. The parcel is already disturbed since it was formerly used as a parking lot during the construction of the now closed Rancho Seco Nuclear Generating Station.

The batch plant consists of a rubber-tired loader, storage bins and aggregate weight batchers. The plant will mix aggregate, sand, cement and fly ash with water in a 12 cubic yard mixer drum. Mixer trucks will then transport the mixture to the CPP site, approximately one mile south of the batch plant, for permanent placement.

The batch plant will operate under authorization of a Statewide Air Quality Permit that limits the pollutants the plant can generate. Cyclonic filters, water and fabric filters are used to control dust generation. Batch plant operational equipment and recycle-mix trucks are fueled with PuriNOx fuel for compliance with environmental regulations.

SMUD will construct a berm around the proposed batch plant site to collect and control wash water, process water and stormwater. All waters will be reused within the facility.

The plant is expected to be on the site no longer than 8 months. It will then be removed and the site returned to its current condition.

The Energy Commission staff reviewed SMUD's petition for an insignificant project change and determined that the batch plant will have no significant environmental impacts. Further, with the batch plant located on site, approximately 32% fewer large aggregate, sand and cement trucks will drive on SR99 and Twin Cities Road to deliver concrete to the site.

Pursuant to section 1769(a)(2), Title 20, California Code of Regulations, Energy Commission approval for this change is not required if Energy Commission staff determines: 1) That there is no possibility that the modification may have a significant effect on the environment, and 2) That the modification will not result in a change or deletion of a condition of certification adopted by the Commission, or make changes that would cause the project not to comply with applicable laws, ordinances, regulations, or standards. Energy Commission staff has determined that the addition of a portable/temporary batch plant meets these criteria because:

If you object to staff's determination, please submit the objection in writing to Ms. Jeri Zene Scott, Compliance Project Manager, at the address above, or by fax at (916) 654-3882, or via e-mail at If no objection is received by Wednesday, December 31, 2003 at 5:00 P.M., the requested change will be approved.

This Notice is also posted on the Energy Commission's website at

If you have questions, please contact Ms. Jeri Zene Scott at (916) 654-4228.


TERRENCE O'BRIEN, Deputy Director
Systems Assessment & Facilities Siting Division

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