1500 INDUSTRY ST 2018-01-01 MF Import

i � (� � i 8.6 PUBLIC�VATER SUPPI,IES 8.6.1 Threshold The analysis in the 1Vater Sysrem P/mi projected the overall future peak-hour demand for the area at 2.7 gpm/acre (approximately 4,000 gpa/day peak tlow)> and assumed fire flow requirements of approximately 3,500 gpm for commercial and industrial/manufacturing uses. Based upon the proposed desien of the water systern, any development using more than 2.7 gpm/acre has the potential ro affect water pressure on other sites. Additional analysis will be required for development proposals with a pealc hour demand above 2.7 gpm/acre and/or a fir� , .w requirement of 3,500 gpm or greater. The addi[iona] analysis may be as simPle as calculations completed by the Public Works Department prior to a pre-application meetino on a specific development proposal. The additional analysis must determine how the proposal's w'ater demand will affect the entire water supply and distribution system. Projects with no additional major improvements needed and no adverse cumulative impacts on the water supply and distribution system are covered by this analysis. Ar. analysis was conducted on the proposed water system. It was determined that a fire flow of 5,000 gallons ner minute could be achieved by the existing and proposed system. The 2.7 gpm/acre is an overall average pea!: hour demand assumed for planning in large areas such as the smdy acea. Ho�vever, there will undoubtedly be site-specific proposals with larger demand. For example, ]arge irrigation systems can exceed 50-gpm/acre demand. Other land uses �vith demands much lower than 2.7 gpm/acre, such as wazehouses, are assumed to occur to offset the higher demand land uses, resulting in an o�'erall area wide average of?.7 gpm/acre. R.6.3 Mitigation Measures 1. Looped water mains may be required for some sites to meet fire flow requirements and to protect water quality. Pressure reducing valves may be required when looped systems are constructed. (SEPA Public Services and Utilities Policics) Z. Developments must construct improvements necessary[o provide a water pressure of 40-80 psi under normal operating conditions as required by Public Works. (SEYA Public Services and Utilities Policies) 3. Recycling of runoff water from Uus or truck N�ashing facilities i� required. (SEPA Public Services and Utili[ies Poiicies) 4. New ��ater system facilities must avoid environmentally sensitive areas to the maximum extent possible. Where water lines must be constructed through environmentally sensitive areas, best mana�ement practices must be followed. (See the miti�ation measures discussed in Section 4) (SEPA E:uth, ��'ater, and Plant and Animal Policies) �J