Proposed In-Place Replacement of Glenn0Colusa Irrigation District's (GCID) Existing Davis Weir Diversion Structure on the Colusa Basin Drain
- SCH Number
- Lead Agency
- Glenn-Colusa Irrigation District (GCID)
- Document Title
- Proposed In-Place Replacement of Glenn0Colusa Irrigation District's (GCID) Existing Davis Weir Diversion Structure on the Colusa Basin Drain
- Document Type
- NOE - Notice of Exemption
- Document Description
- The proposed project consists of the replacement of the existing flashboard weir structure with an Obermeyer inflatable spillway gate weir. The Obermeyer weir consists of a series of steel panels supported by inflatable air bladders providing for adjustment of weir elevation. The existing concrete floor and end-walls will be reused, and a new concrete floor section will be constructed directly downstream of the present floor between the existing end-walls to support the new inflatable weir. A small structure to house control equipment will be constructed adjacent to the weir structure. Project construction is scheduled to take place in Fall 2010 to take advantage of low water flows in the Colusa Basin Drain, and any drain flows will be bypassed around the construction site to facilitate the construction work.
- Contact Information
Glenn-Colusa Irrigation District (GCID)
344 E. Laurel Street P.O. Box 150
Willows, CA 95988
Phone : (530) 934-8881
Notice of Exemption
- Exempt Status
- Categorical Exemption
- Type, Section or Code
- 15302, 15303, 15304
- Reasons for Exemption
- The substantive components of the Project involve the replacement of an old, potentially dangerous and structurally failing flashboard weir structure with a modern mechanically inflatable weir (spillway gate); constructing a new small control structure to house air compressors and electro-mechanical control equipment and to install small conduits in trenches leading from the control structure to the weir. The weir replacement in a Class 2 Exemption, defined in Article 19, Section 15302 of the CEQA guidelines. Class 2 consists of Replacement or Reconstruction of existing structures where the new construction will be located on the same site as the structure replaced and will have substantially the same purpose and capacity as that structure. The construction of the small control building is a Class 3 Exemption defined in Article 19, Section 15303 of the guidelines. Class 3 consists of New Construction or Conversion of Small Structures including the construction of small structures and the installation of small new equipment and facilities within such small structures. The excavation, backfill and grading of a small trench from the control building down to the weir for the pneumatic and control conduits is a Class 4 Exemption defined in Article 19, Section 15304 of the guidelines. Class 4 consists of Minor Alterations to Land including water and/or vegetation which do not involve removal of healthy, mature, scenic trees except for forestry or agricultural purposes. The project site is a flood control levee that is devoid of any trees or other substantial vegetation other than native grasses so the trenching will have no significant impact to the land.
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