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CITY OF FLORESVILLE MASTER PLAN Sludge The plant has a set of four sludge drying beds and two smart boxes to use for sludge handling. The sludge removed in the secondary clarifiers is dewatered and transported to a permitted composting operation. Liquid supernatant is directed back to the lift station to be recycled through the plant again. Projected Population Growth A detailed population analysis and projection was performed as a part of the overall City of Floresville Master Plan. This projection includes a sharp rise in the immediate future due to the impact of the mining activity in the area, followed by a gradual population increase at the observed linear base growth rate. That data was used as the basis for wastewater flow projections. When comparing these numbers with the projection in the 2008 Wastewater Master Plan, it is noted that the intercensus data used by Melden & Hunt to estimate population growth supported an estimated growth rate of 3.5% per year. The correction found in the 2010 Census suggests a linear base growth rate of approximately 70 persons per year (roughly 1.1%). Projected Flows Using the previously determined value of 92 gpd per capita, the expected average daily flow was calculated based on the population projection. This represents the most reliable flow prediction. For comparison, the existing trend was also projected to show the expected growth without the influence of the mining population. As plant expansion timeframes are based on the three-month average daily flow, the annual averages are of limited importance. Applying the calculated peaking factor of 1.21 to these base flows provides a more realistic estimation of when the critical plant capacity thresholds can be expected to occur. These estimations are approximate as the actual flow depends on seasonal, climatic, and other factors in addition to population which could, given certain circumstances, cause the existing plant capacity and permitted flow to be exceeded as early as 2013. Page 36
CITY OF FLORESVILLE MASTER PLAN 9,000 8,500 Projected Wastewater Effluent Flow City of Floresville 900,000 850,000 Population 8,000 7,500 7,000 6,500 6,000 5,500 5,000 800,000 750,000 700,000 650,000 600,000 550,000 500,000 Average Daily Flow (gpd) Census Interpolated Population Population Projection Historical Annual ADF Projected Annual ADF Average Flow Trend Population Projection Source: City of Floresville 2012 Master Plan Projected Average Daily Flow Source: Assumed 92 gpd per capita 1,100,000 Existing Permit Capacity Projections City of Floresville 1,000,000 Historical Annual ADF Average Flow Trend* Flow (gpd) 900,000 800,000 700,000 600,000 500,000 Trend Peak Projected Average ADF Projected Peak 3-Month ADF Existing Permitted Flow 75% Existing Permitted Flow (Commence Expansion Planning) 90% Existing Permitted Flow (Expansion Authorization Deadline) 400,000 *Average Flow Trend is based soley on historical data and does not account for expected population increases due to mining development. **Expected Peaks based on Average Flow with a three-month peaking factor of 1.21. Page 37
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