R2002-211 AUTHORIZING EXECUTION OF AGREEMENT

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. { Page 2 The major component in the first phase is to remove suspected sump pump discharges from the Cresthaven Park subdivision. Other recommendations are to initiate a more aggressive pipe cleaning and root control program for the sewers in the study area combined with miscellaneous repairs to the system. As stated in the preceding paragraph, the maintenance issues will be dealt with in future staff presentations. i Televised inspection of area sewers showed the Cresthaven Park system to be in good condition li with very few signs of ground water infiltration. These inspections were conducted during wet weather and noted flows coming from some residential service laterals that were consistent with I� sump pump discharges (i.e. the flow exits the pipe in "waves" suggesting pump action pushing the discharge). Flow monitoring was used to determine the volume of sewage flowing through various locations in the area sewers. The flow in the sanitary sewer system was monitored during two significant rainstorms that caused the sewers to overflow. Flow momtonng dunng these storms logged a si ificant s ike in the sewer flows exiting the Cresthaven Park subdivision. These flows were � P significantly higher than is expected or recommended in sanitary sewers. A significant spike in the flow from a sewer in such good condition suggests discharges other than sanitary coming from the homes feeding the sewer. There is no other way for this quantity of storm water to enter the system. The most likely cause of this spike in the sanitary flow during a storm is the presence of sump pumps discharging into the system in reaction to rising ground water. The approach staff proposes to take with respect to suspected sump pumps in Cresthaven Park is to construct drain lines to convey sump pump discharges from neighborhood homes to nearby storm drains. BGM estimates a cost of around $400,000 to install drain lines in the Cresthaven Park subdivision. The purpose of these proposed drain lines is to provide an alternate location for the discharge of sump pumps rather than forcing them to be discharged onto the street or into yards where the flows are an ongoing nuisance (moss in the summer, ice in the winter, etc.). In order to design the proposed drain system, it is important that the City know which homes have sump pumps. In order to succeed in removing sump pumps from the City sewer, home plumping inspections may be necessary. To this end, staff proposes that a letter be sent to Cresthaven Park residents similar to the draft letter attached hereto. Staff recommends approval of the attached agreement with Tele Scan, Inc., for home inspection services. Households that declare that they do not have a sump pump or decline to respond to the letter are candidates for an inspection of their plumbing system. There are approximately 125 homes in the Cresthaven Park Subdivision. It is possible that all homes may need to be inspected and some homes inspected more than once. It is possible that City staff may need to obtain a search warrant to perform plumbing inspections on some homes. Broad brush options for financing any proposed drainage improvements to accommodate area sump pump discharges include: (1) full public funding, (2)public /private (assessment) funding, or (3) full private (assessment) funding. Staff will prepare financing options and recommendations when more information regarding the scope and parameters of the project are known. This will be after replies have been received to the letters sent and/or home inspections have been largely completed.