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TECHNICAL MEMORANDUM <br /> August 2017 Metersense Water Interval Data <br /> City of San Marcos <br /> As part of the process of updating the City's Impact Fee ordinance, it is necessary to determine how <br /> many SUE's the City is currently serving as this is used in determining the cost of serving existing <br /> customers versus the cost of serving new customers. Previously, the City would base the estimate on the <br /> number and size of meters in the system. However, based on the previous recommendation to change <br /> the definition of an SUE to be 0.4 gpm of peak demand, it is appropriate to use a different approach in <br /> determining the number of SUEs currently being served. This Technical Memorandum provides a <br /> description of the revised methodology to be used for this analysis as well as future analyses. <br /> EVALUATION METHODOLOGY <br /> The City implemented a complete change to Smart Meters for all of its water customers. As a result, the <br /> City can produce hourly data for all meters within its system for any given hour. In the previous analysis, <br /> it was determined that the month of August was typically the month where the peak water demand <br /> occurred. The City provided APAI with hourly demands for each meter in the system for the month of <br /> August 2017. <br /> DATA ANAMOLIES <br /> These records were reviewed for reasonableness. Four suspect data points were identified in this <br /> process. The data indicated that one meter showed use of 200,768 gallons between 2 and 3 a.m. on the <br /> 2nd and le of the month. The use for all other hours on those days was 0. In addition,the total use of all <br /> other meters for those hours was approximately 250,000 gallons. A second meter showed use of <br /> 353,000 gallons between 7 and 8 a.m.on the 25th. The data showed use for the hours surrounding this <br /> data point were less than 500 gallons. In addition, the total use shown for all other meters during this <br /> hour was 204,000 gallons. Finally, a third meter showed use of 457,000 gallons between 3 and 4 a.m.on <br /> the 28th with no use being shown for the rest of the day. The total use shown for all other meters during <br /> this hour was 164,000 gallons. <br /> City staff was contacted about these anomalies and it was determined that the readings were obviously <br /> erroneous and therefore were removed from the data set. <br /> DATA ANALYSIS <br /> The following table contains a summary of the daily water demands for the month of August 2017 as well <br /> as the peak hour demand. <br /> 2 of 4 <br /> m protects106001018-011impact fees-capacitylsan marcos 2017 sue determination-docx <br />