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, Memorandum March 14,2005 Page 4 . Infrastructure Assessment Methods The City's watermain system conditions are assessed through the following: . Observations of exposed appurtenances such as hydrants, valves, the lowers and booster station. City staff observe the towers and booster station operation on a daily basis. . Water towers are periodically drawn down to observe the condition of the interior walls to determine what improvements are necessary if any. . Operation of valves and hydrants is done on a routinc basis by City crews to determine the condition of these items. . Trunk and distribution watermain conditions are difficult to assess without significant disruption to the public and relatively significant costs. Since watennain is a closed pressurized system access to these pipes usually requires the excavation of access pits, temporary shut down of water supply and the use of cameras sonar or x-ray equipment to indicate pipe cracks. Deficiencies in watermain pipe are much less obvious than sanitary sewer or storm sewer pipe since a tIne crack or pit in the pipe (which may lead to a break) are very difficult to see visually and somewhat difficult to see even with special equipment. Once an inspection is complete the watermain would be disinfected, pipe patched (at access pit) and refilled with water. For this reason, we have mainly relied reports of breaks from City crews or observations trom PMP excavation work to initiate watcrmain pipe replacement or repairs. ~ City staff surveyed surrounding communities regarding watermain breaks and compiled the following information: Q!y Arden Hills Shoreview Moundsview New Brighton Roseville Ave. Annual WM Breaks 12 II 6 31 40 . Repair and Rehabilitation Techniques Watermain infrastructure repair and rehabilitation techniques include the following: . Water Storage Towers: Coatings for corrosion resistance (inside and outside) . Booster Station: rebuild or replace pumps as they age, update electronic controls as necessary . Hydrants and Valves: Replace when inoperable . Distribution and Trunk pipes - spot repair, replacement, epoxy lining, CIPP lining Recent Capital Improvements . Replacement ofthe pumps and controls in the booster station - added backup generator . Applied coatings to the north water tower for corrosion resistance . Replaced valves and hydrants in mill and overlay project areas and reconslruction project areas 2003-2004. . Construction of emergency connections to Shoreview (planned 2005) and New Brighton . New Trunk pipe from north tower to Karth Lake neighborhood (replacing inaccessible undersized pipe under Karth Lake wilh 12" pipe along Cummings Park Drive and Lexington Avenue) . New Trunk pipe along Old Highway 10 (replaced deteriorated pipe) . New Trunk pipe along Old Highway 10 (completed trunk loop and provided potable water for . residents on well systems) . New Trunk pipe along Gateway Blvd and West Round Lake Rd (reconstructed segments) . Replaced distribution pipe in Edgewater Avenue (corroded condition)