1. Cal Poly San Luis Obispo Water Conservation Best Practices UC/CSU/CCC Sustainability Conference UCSB June 24-27, 2007 Presented by Dennis K. Elliot, PE Manager of Engineering and Utilities

2. Cal Poly San Luis Obispo Water Conservation Best Practices Low Flow Fixture Retrofits of over: 200 low flow urinals – 1.5 gpf 200 low flow urinals – 1.5 gpf 200 low flow toilets – 1.6 gpf 200 low flow toilets – 1.6 gpf 300 lavatory faucets – 1.0 gpm 300 lavatory faucets – 1.0 gpm 500 shower heads – 2.5 gpm 500 shower heads – 2.5 gpm

3. Cal Poly San Luis Obispo Water Conservation Best Practices Total project cost $238,000 Total project cost $238,000 Water savings: Water savings: 39,000 CCF or 29 Million gal per year - 15% of campus total 39,000 CCF or 29 Million gal per year - 15% of campus total Approx 25,000 gal per fixture Approx 25,000 gal per fixture Utility cost savings $240,000 per year Utility cost savings $240,000 per year @$3/ccf for water, $3/ccf for sewer @$3/ccf for water, $3/ccf for sewer

4. Cal Poly San Luis Obispo Water Conservation Best Practices Waterless vs. Ultra Low Flow Waterless pros & cons: Zero water usage saves 45,000 gpy Zero water usage saves 45,000 gpy More housekeeping required More housekeeping required Oil seal replacement Oil seal replacement Do not pour water down drain! Do not pour water down drain! Cartridge replacement Cartridge replacement Supply piping still required by code Supply piping still required by code

5. Cal Poly San Luis Obispo Water Conservation Best Practices Waterless vs. Ultra Low Flow Ultra Low Flow Urinal pros & cons: 1/8 gpf achieves 90% of waterless savings 1/8 gpf achieves 90% of waterless savings Less housekeeping required Less housekeeping required No oil seal or cartridge replacement No oil seal or cartridge replacement Works well with sensored flush valves Works well with sensored flush valves

6. Cal Poly San Luis Obispo Water Conservation Best Practices LEED EB Pilot Project Faculty Office East Building - 20,000 gsf Retrofit all fixtures to ULF, sensored Retrofit all fixtures to ULF, sensored 1/8 gpf Zurn urinals 1/8 gpf Zurn urinals 0.5 gpm sensored faucets 0.5 gpm sensored faucets Will achieve 60% reduction in usage Will achieve 60% reduction in usage Qualifies for two LEED points for water efficiency – Credit 3.1 and 3.2 Qualifies for two LEED points for water efficiency – Credit 3.1 and 3.2 Project cost $15,000 Project cost $15,000 Payback period 8 years Payback period 8 years

7. Cal Poly San Luis Obispo Water Conservation Best Practices Other Conservation Efforts Irrigation controls Irrigation controls Eliminate “once through” cooling Eliminate “once through” cooling Public awareness Public awareness Metering and monitoring Metering and monitoring Management of boilers, cooling towers, water softeners, closed loops Management of boilers, cooling towers, water softeners, closed loops

8. Cal Poly San Luis Obispo Water Conservation Best Practices Unexpected Consequences: Increased concentration of regulated substances in effluent to city. Increased concentration of regulated substances in effluent to city.

9. Cal Poly San Luis Obispo Water Conservation Best Practices Unexpected Benefits: Conservation eliminated need for previously projected future sewer capacity Conservation eliminated need for previously projected future sewer capacity Resulted in $2M savings to Poly Canyon Village Housing project Resulted in $2M savings to Poly Canyon Village Housing project Funds returned to project to help pay for additional sustainability features Funds returned to project to help pay for additional sustainability features

10. Cal Poly San Luis Obispo Water Conservation Best Practices Questions?