AgdaPkt 2004-09-27 - Laserfiche WebLink

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�A-�I(� City of Redwood City Recycled Water Task Force Report March 3, 2004 recirculation pumps in homes. Information regarding these items provided by Dr. John Whitcomb and City staff is included in Attachment 4. Note that once the programs discussed below have achieved their tazgets, follow-up programs will likely be required to maintain the potable water demand reductions achieved. For example, when a water-saving device reaches the end of its useful life, it would need to be replaced with another water-saving device to maintain the reduction in potable water demand. In addition, the City may want to expand any hugely successful conservation programs to achieve even greater reductions in potable water demand than what is provided by the Alternative TF programs. 3.1.4.1. Pre-Rinse Spray Nozzles Prior to washing, restaurants, cafeterias, and other food service providers typically remove the majority of the food remaining on plates and trays using a pre-rinse water spray. According to Dr. Whitcomb, water-efficient versions of pre-rinse spray nozzles have recently become available. Alternative TF includes a program to replace existing pre-rinse spray nozzles with water-efficient versions. As part of this program, the City would provide and install water- efficient pre-rinse spray nozzles free of charge. The City would also market this service to all restaurants, cafeterias, and other food service providers within the City's water service area. Based on Dr. Whitcomb's assessment of potable water demand reduction per restaurant and an expected market penetration rate of 50 percent, this program is expected to reduce potable water demand by approximately 33 AF/Y. Dr. Whitcomb estimates the cost to the City of this program to be $7,000, based on cost-sharing provided by the California Public Utilities Commission, which is sponsoring this program. Although this program is not included as a Best Management Practice ("BMP") in the Urban Warer Management Plan, the City has recently begun implementing it. Since the City has already begun implementing this program with existing funds, the cost of this program is not included in the cost of Alternative TF. However, since it is not included in the Urban Water Management Plan, the resulting water savings are included in Alternative TF. 3.1.4.2. Evapotranspiration Controllers The ET controllers program builds on the existing BMP 5 program in the Urban Water Management Plan. After installation, the ET controllers automatically adjust irrigation schedules based on environmental monitoring data (e.g., rainfall, temperature over the course of the day) transmitted from a local weather station. Since City parks already have similar technology, the ET controller program is targeted at other water users with irrigation-only accounts. As part of the ET controller program, the City would pay the product and installation cost. The water customers would be expected to pay the on-going service fee. The City would market this program to irrigation-only water users served by the City. The program would be offered to potable and recycled water users because ET controllers will help limit run-off of recycled water due to over-watering.