1. 2005 SSOs reported to WQCD: A Cursory Data Scan Ravi Srivastava, Ph.D., P.E. Boxelder Sanitation District, Ft. Collins, CO Gary Soldano, P.E. CDPHE-WQCD, Pueblo, CO WQF-Spills workgroup

2. Data Source: Gary Soldano, CDPHE-WQCD Pueblo Office, Pueblo • Gary.Soldano@state.co.us • 719-545-4650; fax 719-543-8441 • Data Analysis: Ravi Srivastava, Boxelder Sanitation District, Ft. Collins • bsd@verinet.com • 970-498-0604; fax 970-498-0701 WQF-Spills workgroup

3. This Presentation • Cursory analysis of 2005 SSO information • Attempting to ask questions like: • When • How much volume discharged • For how long • How did it occur • Where • Who WQF-Spills workgroup

4. Analyses • Accepted data as is • Did not examine data for completeness or accuracy • Simple sorts/analyses to obtain answers to fundamental questions • All analytical errors are responsibility of Ravi Srivastava WQF-Spills workgroup

5. Reporting a Spill • CDPHE Toll-Free 24-hour Environmental Emergency Spill Reporting Line1-877-518-5608 • On-call responder calls and asks questions • Follow-up with forms to provide detailed information to WQCD WQF-Spills workgroup

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9. How Many SSOs? When? • 203 SSOs reported during calendar year 2005 • Lowest # spills in June, July and August; no pattern in total volume of spills by season. WQF-Spills workgroup

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13. How Much Spilled? • Volume from 2/3 gallon to over 2 million gallons; 12 reported with unknown volume • 40% of SSOs in the 101-1000 gallons range, 30% in the 11-100 range. WQF-Spills workgroup

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22. How Did It Happen? • Haven’t had time to analyze thoroughly • Performed quick search for frequency of occurrence of key words • Block/blockage 73 • Grease 34 • Lift station 27 • Roots 17 • Basement 17 • Construction 11 • Plug 11 WQF-Spills workgroup

23. Spill Duration? • Duration known for < 10% of reported events • Vast majority of unknown duration • Known duration range from < 1 hr to > 100 hr WQF-Spills workgroup

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26. Where? • El Paso, Arapahoe, Douglas, Adams, Weld counties are the top 5 by no. spills • El Paso, Arapahoe, Gunnison, Larimer, and Las Animas are the top 5 by spill volumes WQF-Spills workgroup

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31. Who? • Top 5 entities with highest no. of SSOs reported • Colorado Springs Utilities, • City of Durango, • Cortez Sanitation District, • City of Evans, and • City of Trinidad • 12 events were reported with unknown volume of SSOs WQF-Spills workgroup

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33. Who? • Top 5 entities with highest volume of SSOs reported • US Army-Ft. Carson, • East Cherry Creek Water and San, • Mt. Crested Butte Water and San., • Colorado Springs Utilities, • Ft. Collins Utilities Water Treatment • 12 events were reported with unknown volume of SSOs WQF-Spills workgroup

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35. Looking Back • Cursory analysis • Know a bit about when, where, how SSOs occurred, how much spilled, duration of SSO, responsible party • Data probably a partial subset of actual SSOs • Suspect • underreporting on occurrence [see next graph] • error in volume/duration WQF-Spills workgroup

36. Reported SSOs in WQCD Database WQF-Spills workgroup