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SECTION 6: POTENTIAL FOR HEAD RECOVERY AT MWD CONNECTIONS 19 The projected cost to purchase and install the new hydro turbine is $835,988. This involves the purchase of the new turbine generator set with electrical panel and controls, the construction of a new vault below the sidewalk to house the turbine and switchgear, the connection with SCE including a new transformer to accept the power, and integration with the existing SCADA controls. 6.6 MWD STATION SA -6 The pressure reducing station SA -6 is installed in a vault under the sidewalk at the northeast corner of E. Santa Clara Avenue and Tustin Avenue. The configuration is shown in Figure 5, with three PRVs and six isolation valves, approximately eight feet below the sidewalk. The SCADA monitoring and associated electrical meter are installed in small cabinets mounted nearby on the sidewalk. The SCE Service Account number and rate schedule is not known. The three PRVs are installed in parallel at different sizes, 6 -inch, 10 -inch and 16 -inch. The combined operation of these PRVs is typically controlled at 12 CFS. The typical pressure drop through this station is assumed to be the typical MWD pressure (177 psig) reduced to the upper zone pressure of 100 psig, for a pressure difference of 77 psig (or 178 feet). Figure 5 SA -6 Existing Configuration .............................. .............................. Pressure Relief Valve_ h. ,T 24 I To Santa Ana hrust 11 Block Pressure Reduction 6" 70" 7y'• Valves with Flow Control 24 I L.J MWD Thrust Block Vault Under Sidewalk 6.7 POTENTIAL PROJECT AT SA -6 The proposed project at SA -6 is to install a new hydro turbine generator in parallel with the existing Pressure Reducing Valves. There is no room in the existing vault, so a new vault would be required, potentially on the north side of the existing vault. This is illustrated in Figure 6. The new vault would contain the new hydro Newcomb I Anderson I McCormick 19H-27 CITY OF SANTA ANA