Res 2015-012/Wastewater Master Plan

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Wastewater Master Plan City of San Marcos Executive Summary Lift Station, Blanco River Village Lift Station, Elm Hill Lift Station, Hills of Hays Lift Station, Gary Job Corp Lift Station, and City Softball Fields Lift Station. • New growth and capacity improvement lines were a major focus of the capital improvements program. The City will continue to grow on the periphery which will require new infrastructure including wastewater mains, lift stations and force mains to provide service to new customers. • The expansion at Main Lift Station is the largest and most critical since the majority of the City's wastewater flow is conveyed to the wastewater treatment plant through this lift station. Therefore, a more detailed analysis of the existing and future capacity was conducted to identify specific improvements needed at this lift station. • Based on the population and flow projections, additional treatment capacity is needed in the future. Comparing the probable cost of construction between expansion of the existing plant and constructing a new plant, FNI recommends that the City expand the existing treatment plant. This alternative will provide the City with the additional treatment capacity to meet future growth in a cost effective manner. • FNI reviewed ground elevation and plat data to develop two capital improvement projects that consist of a lift station, force main and gravity wastewater lines that will convert the residents of Willow Creek Estates to the sanitary sewer system. • Several improvements were evaluated that are intended to serve specific developments. These projects are designated with a "Y and are completely driven by the development that the projects serve. 8.0 WASTEWATER CAPITAL IMPROVEMENTS PLAN A capital improvements plan was developed for the City of San Marcos to ensure the wastewater collection system will effectively and efficiently continue to convey flow to the wastewater treatment plant. The recommended improvements will provide the required capacity and reliability to meet projected wastewater flows through year 2035. Capital costs were calculated for the major wastewater facilities and do not include individual service connections or subdivision lines. The costs are in 2014 dollars and include an allowance for engineering, surveying, and contingencies. Table ES -3 summarizes the costs by phase of the wastewater system capital improvements plan. ES -6