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RIVERSIDE PUBLIC UTILITIES -_ Board Memorandum U i i i T i r T ; F. S BOARD OF PUBLIC UTILITIES DATE: September 17, 2010 ITEM NO: 9 SUBJECT: CASA BLANCA 4 kV TO 12 kV CONVERSION OF CIRCUIT 54 TO CIRCUIT 1205 WORK ORDER NO. 1023210 ISSUE: Board of Public Utilities approval is requested for Work Order No. 1023210. RECOMMENDATION: That the Board of Public Utilities approve the estimated capital expenditure of $381,597 for the Casa Blanca 4 kV to 12 kV Conversion Project. BACKGROUND: This project is the second and final phase for 4 kV to 12 kV circuit conversions from the Casa Blanca Substation, encompassing a large area along Evans Street, Grace Street, Victoria Avenue, and surrounding areas (see Site Map). The first phase was approved by the Board on August 20, 2010 and converted Circuit 53. The conversion of Circuit 54 is due to the age and obsolescence of the 4 kV equipment and feeders at Casa Blanca Substation. Riverside Public Utilities (RPU) ceased the 4-12 kV conversion in 2000 which resulted in a 4 kV "island" in the Casa Blanca area. This action created no external ties to other Substations, resulting in the potential for extended outages should the obsolete equipment fail. The recently completed Electric System Master Plan and RPU's internal Reliability Assessment both recommend the conversion of these facilities. The scope of the work involving the conversion of a 4 kV circuit to a 12 kV circuit consists of replacing approximately 10 poles, changing out 9 transformers, installing 4-600A overhead switches, replacing approximately 300 feet of primary conductors, along with the replacement of all crossarms and insulators. Engineering will be performed by staff and construction will be performed by either Utility staff or by contractors using the Utility Contractor's Panel. FISCAL ELECTRICAL IMPACT: The total estimated cost for Work Order No. 1023210 is $ 381,597. % of Total Construction-Electric Conduit& Structures $291,685.00 76.44% Design, Construction Management, Inspection $89,912.00 23.56% Subtotal: $381,597.00 100% Funds are budgeted and available for this project in the Major 4 kV to 12 kV Conversion Account No. 6130000-470644.