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I I I I I I I I I I I I I I I I I I I A pump control building is needed at the well site to house electrical controls, flow meters, and chlorination equipment for both wells. Record- ing meters are required for permanent records of water withdrawal from the aquifer. Prior to pumping the water into the potable delivery system, it must be chlorinated. Preliminary Design of Reverse Osmosis System for Treating Existing Water Supply In the design of a Reverse Osmosis (RO) system, the capacity of the system to be used is very important ~s the construction and operation and maintenance costs are directly related to the size of the system. Therefore, treated water (product water from RO system) storage is required due to fluc- tuation in the demand for water on an hourly, daily, etc. basis. The amount of storage required is a function of the capacity of the RO syst~m used. Two alternate systems were investigated in the study: (1) an 8J,000 gpd system (maximum monthly flow for existing demand rates and aJproximately average daily demand in the year 2000) with a required 100,000 gallon under- ground storage tank; (2) a 150,000 gpd system with a required 30,000 gallons underground storage tank. Either system will reduce the nitrates to less than 45 mg/l based on a raw water nitrate concentrations of about 100 mg/l. Actually the RO product water contains less than 14 mg/l N03~ but it is blended with raw water at a ratio of approximately 65% RO to 35% raw water to keep the size of the RO system as small as possible. The finished quality of the blended treated water would contain approximately 200 mg/l dissolved solids as compared with the actual raw water dissolved solids concentration of 450 mg/l. This reduction in dissolved solids would be a bonus in addition to the removing of the nitrate which is the main purpose of the RO treatment system. 34