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CHAPTER 6 COMMUNITY FACILITIES 124 i • 4. To eliminate any infiltration/inflow problems that may exist or develop in the sanitary sewer system and meet or exceed standards set by the Metropolitan Waste Control Commission. 5. To phase out any lift stations if possible in the future when new gravity lateral sewers are installed. 6. To require any malfunctioning septic systems to be eliminated and require connections to the sanitary sewer system. WATER SUPPLY DISTRIBUTION EXISTING CONDITIONS AND NEEDS New Brighton's water system originally utilized a system of wells in the Prairie Du Chien/Jordan aquifer for its water supply. Following the discovery of volatile organic contamination in several of these water wells in 1981, the City was forced to construct new wells into the deeper uncontaminated Mount Simon/Hinckley aquifer. The source of the contamination was determined to be the Twin Cities Army Ammunition Plant in Arden Hills. In 1987, the City obtained a settlement from the Army for the loss of the water supply and associated costs. As a result of the groundwater contamination and Army settlement, the City's future water supply will be from a combination of the new Mount Simon/Hinckley wells and granular activated carbon (G.A.C.) facilities installed on the old wells. The G.A.C. facilities will remove the volatile organic chemicals to a undetectable level. Utilization of the G.A.C. facilities to purify the water from the old wells will restore the capacity of the City water supply and also help to clean up the aquifer. Throughout the 1980's, the City's water demand was approximately one billion gallons per year for an average daily water demand of approximately 2.75 million gallons per day. Peak water demand days, which are primarily attributable to lawn sprinkling during dry summer months, have approached 7.5 million gallons per day. Since New Brighton is close to fully developed and the population is near the expected peak, the future water demand is not likely to.increase appreciably. • When the G.A.C. treatment facility is completed in 1989, the City will have a total water production capacity of approximately 8,000 gallons per minute.