Res 2016-137/approving a Water Master Plan to guide the future maintenance and extension of the City’s Water Infrastructure

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Alan Plummer Associates, Inc. Water Master Plan Update 2016 The total storage and storage per connection under proposed conditions (2035) is described by Table 2-4. By 2035, two proposed projects will provide additional storage for future years. A 0.5 million gallon (MG) elevated storage tank (EST) is recommended to serve the proposed La Cima Development in northwest San Marcos. This tank will also serve Pressure Plane. Additionally, a 0.51 MG tank located on a hill top (named Trunk Hill) will provide elevated storage to the proposed Paso Robles Development and surrounding area. Future project details are described further in Chapter 6. In future conditions, Table 2-4 requirements, however, the elevated storage requirement of 100 gallons per connection is not met (lacking 0.88 MG EST) using the new TCEQ definition of a connection. Based on the previous definition of a connection, the approximate number of connections in the 810 pressure plane would have been 12,370. Using the previous definition for a connection, the City would be required to have 1.24 MG of elevated storage, which is exceeded even under existing conditions (1.71 MG existing EST in Table 2-3). Under future conditions, elevated storage is estimated to be 2.35 MG, further exceeding the previous definition. The 2003 Water Master Plan had proposed a 1 MG Northside EST, to be located just north of would meet the TCEQ storage requirements according to the new service connection calculation method. However, since all other hydraulic requirements are met (see Chapter 6) in the 2035 future model, additional elevated storage in the 810 pressure plane is not included. The City may wish to document the adequacy of the storage by applying for another ACR variance with TCEQ. Going through the variance process related to these storage requirements for the existing condition and the proposed EST capacity ane will save the City additional large capital expenditures. 2-7 m:\projects\0600\022-01\doc\report\draft\draftmasterplan-v15_hef.docx