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Santiago Pump Station Modifications <br />Santiago Creek, CA <br />The original Santiago Pump Station was constructed at the bottom of <br />Bond Basin in 2002. Four submersible pumps, each with their own MCC, <br />were installed with varying power and head capacities to accommodate <br />large fluctuations in water elevation. Soon after commissioning the <br />station, three of the four pumps failed. <br />In 2011, Orange County Water District (OCWD) installed the floating <br />pump station that is currently in use. In 2019, the last functional <br />submersible pump failed, leaving OCWD without the ability to pump <br />water from Santiago Basin when the water elevation is above 240-feet. <br />The OCWD identified two (2) potential solutions to regain pumping <br />capacity when water elevations are above 240-feet: <br />Option 1 — Add two small pumps to the floating station and construct <br />any necessary modifications to accommodate the additional pumps; or <br />Engineering Fee: <br />$178,000 <br />Schedule: <br />February 2022 <br />Key Staff: <br />Tom Epperson, PE <br />Project Director <br />Laurence Esguerra, PE <br />Team Leader <br />Neha Gajjar, PE <br />Project Manager <br />Matt Vera, PE <br />Design Engineer <br />Mazen Kassar, PE <br />Electrical/Controls <br />Manager <br />Eric Yuen, PE, SE <br />Structural Engineer <br />Reference: <br />Orange County Water <br />District <br />Fountain Valley, CA <br />Chris Olsen, PE <br />714/378-3232 <br />Option 2 — Replace the existing larger pump drives with Variable Colson@ocwd.com <br />Frequency Drives (VFD) and construct any additional necessary <br />modifications that will allow the pumps to function within the configuration of the existing facilities. <br />The goal of this project was to provide a recommendation and prepare 65% plans on the optimal option <br />to restore the ability to pump water from Santiago Basin. Preliminary evaluations of the options, <br />included identifying the appropriate VFD and their potential costs; coordinating with the barge <br />manufacturer for additional barge sections to accommodate the two smaller pumps; and working with <br />the pump manufacturer to obtain potential costs for the purchase of two smaller pumps. <br />TETRA TECH <br />