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Item 05 - Infllow and Infiltration Project
;���� � � MEMO TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL FROM: BRUNO RUMBELOW, CITY MANAGER P�`� MEETING DATE: MARCH 18, 2008 SUBJECT: AWARD OF ENGINEERING SERVICES CONTRACT- 2008 INFLOW AND INFILTRATION PROJECT RECOMMENDATION: City Council consider approving an engineering services contract with GSWW, Inc. in the amount of $165,800 for the 2008 Inflow and Infiltration Project, authorize the staff to execute said agreement, and take any necessary action. FUNDING: Funds are currently available in the I & I Source Identification Project 99 Utility Bonds, Account 200-48940-534-5000001 SW. BACK�ROUiVD: GSW1N has submitted a proposal to provide engineering design services for the rehabilitation of existing sanitary sewer lines in the Lakeview area. This project is necessitated by aging infrastructure resulting in increased infiltration and inflow of surface water and groundwater into the existing sanitary sewer lines. The sanitary sewer lines proposed for rehabilitation in this project have been identified to have excessive infiltration and inflow into the lines and are part of an ongoing effort to maintain sewer infrastructure and avoid regulatory action against the City. The additional groundwater and surface water introduced into the sanitary sewer collection system causes excess flow to the wastewater treatment facilities and potential overflows from sewer manholes. The design is proposed to incorporate trenchless construction where the existing lines will be burst in place and simultaneously replaced with a new line. New sewer services and cleanouts will be installed for residents served by the lines in these areas. Manholes and cleanouts for the sewer will be replaced or rehabilitated. The construction budget is estimated by GSW1N to be approximately $3.6 million dollars and the design fee is proposed as $165,80Q. GSW1N specializes in this type of work and is well qualified to perform the work. 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