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HomeMy WebLinkAboutItem 11 - Sanitary Sewer Improvements ������ � MEMO TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL FROM: BRUNO RUMBELOW, CITY MANAGER 3�Z MEETING DATE: JULY 15, 2008 SUBJECT: 2008 SANITARY SEWER IMPROVEMENTS — CHANGE ORDER #1 & 2 RECOMMENDATION: City Council consider ratifying Staff's approval of Change Order #1 in the amount of $14,500 and approving Change Order #2 in the amount of $9,400.00 respectively, authorize City Staff to execute Change Order#2, and take any necessary action. FUNDING SOURCE: Funds are currently available in the Project Fund Balance account 200-48940-534-5- 000001 SW. BACKGROUND: GSW1N has submitted a proposal to provide additional engineering design services for the rehabilitation of existing sanitary sewer lines in the Lakeview Area and design for the relocation of a portion of the 24" Hilton force main. Change Order #1 is for the design of the relocation of 2,700 linear feet of the 24" Hilton force main and has previously been approved by the City Staff. The relocation is needed to replace a portion of the line which has failed twice in the recent past discharging untreated wastewater into the Cottonwood Branch Creek. The relocation will remove a portion of the force main damaged by differential movement of the pipe joints. The joint stress caused the pipe to split lengthwise on two separate occasions along the Cottonwood Branch behind Enchanted Way. By relocating the line, the risk of subsequent failures will be minimized. The cost for the design changes is $14,500 which also includes additional survey costs. Change Order #2 is for the survey and design of repairs to three additional aerial crossings not identified in the original scope and the deletion of design for repairs of another aeriat crossing. The total amount of Change Orders #1 and #2 is $23,900. 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