14 Sept. 2006WQF-Spills workgroup 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

14 Sept. 2006WQF-Spills workgroup2 Data Source: Gary Soldano, CDPHE- WQCD Pueblo Office, Pueblo – ; fax Data Analysis: Ravi Srivastava, Boxelder Sanitation District, Ft. Collins – ; fax

14 Sept. 2006WQF-Spills workgroup3 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

14 Sept. 2006WQF-Spills workgroup4 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

14 Sept. 2006WQF-Spills workgroup5 Reporting a Spill CDPHE Toll-Free 24-hour Environmental Emergency Spill Reporting Line On-call responder calls and asks questions Follow-up with forms to provide detailed information to WQCD

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14 Sept. 2006WQF-Spills workgroup9 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.

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14 Sept. 2006WQF-Spills workgroup13 How Much Spilled? Volume from 2/3 gallon to over 2 million gallons; 12 reported with unknown volume 40% of SSOs in the gallons range, 30% in the range.

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14 Sept. 2006WQF-Spills workgroup22 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

14 Sept. 2006WQF-Spills workgroup23 Spill Duration? Duration known for < 10% of reported events Vast majority of unknown duration Known duration range from 100 hr

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14 Sept. 2006WQF-Spills workgroup26 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

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14 Sept. 2006WQF-Spills workgroup31 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

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14 Sept. 2006WQF-Spills workgroup33 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

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14 Sept. 2006WQF-Spills workgroup35 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

14 Sept. 2006WQF-Spills workgroup36 Reported SSOs in WQCD Database