Drop 1 (Hydroelectric Power Plant) U1 Refurbishment (No. 200297)


SCH Number
Public Agency
Imperial Irrigation District
Document Title
Drop 1 (Hydroelectric Power Plant) U1 Refurbishment (No. 200297)
Document Type
NOE - Notice of Exemption
Document Description
The Drop 1 hydroelectric power plant (turbine) Unit 1's major components (runner hub, drive shaft, turbine-generator, gear box) require refurbishment to maintain Unit 1's reliability. Drop 1 U1 was last repaired in 2006 and to-date the unit has been in operation approximately 17 years. The manufacturer recommends that turbine components be inspected and overhauled (including all necessary checks, alignments and commissioning tests) after 15 years of continuous operation. All seals, bushings, and bearings must also be replaced. The U1 is continuously running necessitating the replacement of lubricant frequently. The increased frequency of maintenance on the unit, beyond normal O&M activities, is indicative of larger problems looming. Refurbishment of turbine components provides an opportunity to maintain energy output, reliability of operation, and environmental soundness.

Contact Information

Donald Vargas
Agency Name
Imperial Irrigation District
Job Title
Environmental Compliance Administrator
Contact Types
Lead/Public Agency / Project Applicant


Citywide, Countywide
Other Location Info
On the All-American Canal 34mi E of Calexico, CA, off I-8, on a portion of the SE quarter, Sec 31, T16S, R20 E, SBM, in an unincorporated area in the County of Imperial, APN 056-200-003.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Sec.15301 (Class 1)
Reasons for Exemption
The project is exempt under Section 15301 (Class 1 exemption) for the reason that it entails the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment, or topographical features, involving negligible or no expansion of existing or former use beyond that existing at the time of the lead agency‘s determination; these include but are not limited to, existing facilities of both investor and publicly owned utilities used to provide electric power or other public utility services.
County Clerk


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