1. LITTLETON/ENGLEWOOD DEWATERING FACILITY I N T R O D U C T I O N

2. Collaborative Design t Needs Assessment - Brainstorming t Meeting Facilitation

3. Design Guidelines t Permit Limitations t Safety and Health t Odor Control t Resource Optimization t Project Scope t Cost Containment t Participation

4. Key Considerations t Clean Process Area t Centrifuge t Sludge Storage t Truck Loading t Polymer System t Conveyance

5. Cost Containment t Product of a Collaborative Design

6. New Dewatering Facility t Location –Centrate Storage Tank, Covered –Odor Control t Centrifuge Room –Modified versus New –Room to work

7. Pump Room t PC pumps versus Piston type –Allowed for Clean operations –One pump per Centrifuge –Piping (250 psi) –Sludge Hoppers - VFD’s t Drains t Centrate Sample Lines

8. Polymer Room t Truck loading dock t Large Storage t Monorail System t Big Bag t Tempered Water t Trench Drains

9. Sludge Storage t Silo –Capacity t Automated

10. Truck Bay t Automated Truck Scale t Optional Loading t Cleaning

11. Centrate Tank t Reused existing Aeration Basin – Capital saving of $1,000,000 –Reduced bottleneck –Reduce struvite build up t Cleaning made easy

12. New Dewatering Facility t Capital savings of $1,200,000 –Modified existing centrifuges t Capital savings of $170,000 –Modified existing polymer system t Capital savings of $400,000 utilizing PC pumps t O & M costs have been reduced by $75,000 annually. (More to Come) –Maintenance has been reduced 5 fold –Lower polymer consumption –Tempered polymer water-2% solids increase

13. New Dewatering Facility t Reduced dewatering shift from 16.5 hours to 9.5 hours t Truck load out from 16 hours to 15 minutes t Truck loaded to specification each time t Target and maintain consistent solids output t Automation from 2 operators at a 16 hour shift, to 1 at 9.5 hours t Sludge storage capacity t Facility provides for very clean operation