11-17-11 Planning and Zoning - Laserfiche WebLink

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As displayed in Map 3.3, Wastewater System, the City maintains an extensive system of 36 lift-, stations Lincluding the lift station serving the Sylvan Beach Pavilion that is currently inactive} and 187 miles of force mains and gravity sewers.12 The City also operates the Little Cedar Bayou Wastewater Treatment Plant (WWTP) located on South 4t" Street at Cedar Bayou, which has a permitted capacity of 7.56 million gallons per day (mgd) by the Texas Commission on Environmental Quality (TC EQ) . The existing wastewater treatment plant was designed in 1980 and put in service in 1982. The plant was expanded in 1986 and again in 2010. These expansions allow the City to treat approximately 21.8 mgd for a peak two hour period (usually during large storm events). At present, the City treats an average . 332 mgd (calculated as an average daily flow f9F - G9RseeHti,.,_e +"r^^ w ^*" ^ ^'2006-2010), which puts the plant at about 42 percent of its permitted sm capacity (see inset on TCEQs "75/90" rule). With the latest round of improvements, the plant will accommodate the City's build -out population13 In addition, the City also still contracts with the Gulf Coast Waste Disposal Authority (GCWDA) f9F n-.-' mgdl ^f r - o+„at a n_e,gotiated fee, currently $0.20 per 1,000 gallons, for up to 0.5 mgd. Post treatment, the majority of the water is released into the Little Cedar Bayou. However, during certain times of the year, particularly summer, the City utilizes a maximum of 600,000 gallons per day (gpd) to irrigate the Bay Forest Golf Course and the soccer fields at Little Cedar Bayou Park. The City has been proactively monitoring and replacing aging infrastructure. Currently, the City has budgeted approximately • $350,000 per year to reduce inflow and infiltration (1/1) problems in • the wastewater collection system. Over time, pipes, valves, and • manholes start to deteriorate consequently, allowing the inflow and infiltration of stormwater/groundwater into the wastewater collection system. This increases the volume of wastewater that must be treated ' a by the WWTP. The additional volume also increases the wear and tear on plant infrastructure and can prematurely cause the City to unnecessarily expend funds on plant capacity increases. The City has also been proactive in replacing, consolidating, or eliminating its lift stations. As late as 2008, the City had 40 lift stations; today 36. In 2003, the City commissioned a lift station evaluation study to determine the highest priority projects. By 2008, four out of five of those projects were complete. The City then commissioned a second lift 12 City of La Porte Website. Retrieved on 10/12/11. 13 Interview with the City of La Porte Public Works Director. A COM UNIT-1' VISION FOR 1A PORTE, TEXAS - 2010 UPDATE