Riverside Public Utilities (RPU) proposes to build a new electrical substation on approximately 0.84 acre within three adjoining parcels consisting of an existing substation (APN 230-245-002) and two commercial buildings (APN 230-245-001, and 003). The Project is located between residential and commercial buildings on the south side of Evans Avenue and the BNSF railroad track right-of-way on the north side of the Project parcels. Access to the Project site is located on Evans Avenue. The existing electrical facility was built in the early 1950's and consists of a step-down transmission substation where voltage is brought in from subtransmission lines at a strength of 33,000 volts (33 kV) and processed so as to reduce the voltage to 4 kV. The resultant voltage is then transmitted onto outgoing power lines for distribution to residential and commercial users.
The Project will result in an improvement of electrical service that will include extension of 69kV subtransmission lines into the new facility, new 12 kV distribution feeder lines, improvement of critical load relief, and add to the existing backup reliability. Parcels located southwest of the existing substation (APN 230-245-003) and northeast (APN 230-245-001) are planned to be acquired to allow for future improvements and increased capacity. This analysis assumes that the two adjacent parcels will be acquired for future expansion.
The new substation will accept 69kV power from incoming subtransmission lines, then the facility will step the voltage down to 12kV. Once stepped-down, the power will be conveyed onto outgoing distribution lines. The new substation will typically require construction of new framework for incoming lines and substation equipment. The voltage is then transmitted overhead to step-down power transformers and voltage regulators. The regulated voltage is then sent to a series of switchgears and onto an overhead distribution bus. From there, the voltage is sent to outgoing distribution lines.
Some undergrounding and/or vaults will be required during construction of the new station. These vaults will be located outside the fenced area. It is not anticipated that excavations associated with the project will exceed 10 feet in depth in any area.
The substation portion of the proposed Project is located at an existing electrical substation at 7625 Evans Avenue. The new substation portion also includes potential and future use of parcels located adjacent to the substation at 7605 and 7635 Evans Avenue. These three parcels, Assessor's Parcel Numbers (APN) 230-245-001, -002 and -003 respectively, are located approximately 0.16 mile southwest of the corner of Madison and Evans and 0.28 mile due south of the State Route (SR-91) and Madison Street in the western portion of the City of Riverside. The proposed Project is located in the City's Casa Blanca neighborhood and within Section 4 of Township 3 South, Range 5 West. The Project site rests on the Riverside West Quadrangle (1981) 7.5-minute topographic quadrangle map. The existing substation portion of the proposed Project has latitude, longitude corresponding to 33 º 55'54.31" north, and 117 º 24'17.74" west. Historical records indicate that the substation section of the proposed Project has been an electrical substation since the early 1950's, and the adjoining parcels have exhibited isolated buildings since the 1940's.
David Hernandez, RPU Project Manager-Utilities Senior Electrical Engineer
Phone: (951) 826-5173
The review period for submitting written comments on the Mitigated Negative Declaration pursuant to State CEQA Guidelines Section 15105 commences on August 16, 2010 and will close on September 7, 2010 at 5:00 p.m. If you have any questions regarding the project or Mitigated Negative Declaration, please contact David Hernandez by e-mail or phone as indicated above.
Written comments should be addressed to:
David P. Hernandez
Riverside Public Utilities
3901 Orange Street
Riverside, CA 92501