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CITY OF SANTA ANA <br />Well No, 32 Mtrate Mitigation and Rehabilitatlon Study <br />A. Nitrate Mitigation Evaluation: We are assuming the following alternatives will be evaluated: <br />No action <br />Blending in the distribution system at the following locations: <br />— Garthe Reservoir <br />— Memory Lane Pressure Reducing Facility (blending Well No. 32 water into the well water <br />from the City's easterly sources) <br />Treatment technologies to reduce the nitrate levels located either on -site at Morrison Park or at <br />Garthe Reservoir. <br />5. Budgetary costs for each of the alternatives shall be prepared. <br />6. Since the well has been out of service for the last five to six years, the City desires to include an <br />estimated cost to rehabilitate the well. <br />7. Pump Design: Tetra Tech will perform an evaluation of the hydraulics and review the existing well <br />pump design and provide a recommendation for the pump design and motor horsepower. Tetra Tech <br />will prepare an engineer's estimate of probable constriction costs for the new well pump and motor. <br />8. Building Modification: Tetra Tech will review the existing underground vault design and then <br />provide a recommendation for modifying the current structure and adding an aboveground building <br />with a stairwell down to the well pump. We are assuming that the new building will be a concrete <br />block building with a gabled roof, similar to other City facilities. <br />9. MCC Replacement: The existing MCC was previously flooded. The new MCC and PLC panels will <br />be located within the proposed building. Tetra Tech will perform a site visit to review the existing <br />panels and instrumentation at the site. <br />RW0597\0086Tngiueering \05\ Welld2-Nitrate- Mitigation \DraRReport\021extdoce 2 - TETRA TECH <br />251 -20 <br />