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DENVER ZOO Lion’s Quarters Recycle Cross-connection Fred J. Sanchez Denver Water, Water Quality Investigations Supervisor.

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Presentation on theme: "DENVER ZOO Lion’s Quarters Recycle Cross-connection Fred J. Sanchez Denver Water, Water Quality Investigations Supervisor."— Presentation transcript:

1 DENVER ZOO Lion’s Quarters Recycle Cross-connection Fred J. Sanchez Denver Water, Water Quality Investigations Supervisor

2 AGENDA THE DENVER ZOO THE DENVER ZOO RECYCLE SYSTEM OVERVIEW RECYCLE SYSTEM OVERVIEW BACKGROUND INFORMATION BACKGROUND INFORMATION INCIDENT DESCRIPTION INCIDENT DESCRIPTION ACTIONS TAKEN ACTIONS TAKEN INVESTIGATION RESULTS INVESTIGATION RESULTS CORRECTIVE MEASURES CORRECTIVE MEASURES

3 Acknowledgments Water Quality Personnel Water Quality Personnel WQ Investigations WQ Investigations Cross-connections Cross-connections Water Control Personnel Water Control Personnel Emergency Services Emergency Services System Quality System Quality Denver Zoo Personnel Denver Zoo Personnel VP for Planning VP for Planning Zoo Staff Zoo Staff My personal friend… My personal friend…

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5 DENVER WATER’S RECYCLE SYSTEM Metro Wastewater Reclamation provides Denver Water’s Recycle Plant with source water Metro Wastewater Reclamation provides Denver Water’s Recycle Plant with source water The source is further treated by Denver Water The source is further treated by Denver Water Biological Nitrification Biological Nitrification Chemical Coagulation Chemical Coagulation Flocculation Flocculation Granular Media Filtration Granular Media Filtration Chlorine Disinfection Chlorine Disinfection DW provides both potable & recycled water to the Denver Zoo DW provides both potable & recycled water to the Denver Zoo

6 DENVER ZOO’S RECYCLE SYSTEM Takes recycled water from Denver Water’s Recycling Distribution System Takes recycled water from Denver Water’s Recycling Distribution System Supplied by the Zoo’s Pump Station Supplied by the Zoo’s Pump Station Owned & Operated by the Zoo Owned & Operated by the Zoo Primary use… Primary use… Wash Down purposes in the animal pens Wash Down purposes in the animal pens

7 DENVER WATER’S RECYCLE SYSTEM PHASE I MAP DENVER ZOO METRO WASTE WATER DW RECYCLE PLANT

8 LNQ’S BACKGROUND INFORMATION Both Potable & Recycle lines are located in the LNQ’S Mechanical Room Both Potable & Recycle lines are located in the LNQ’S Mechanical Room The potable & recycle water entering the mechanical room have separate services The potable & recycle water entering the mechanical room have separate services Potable is used for animal food prep, employee wash room, and hose bibs. Potable is used for animal food prep, employee wash room, and hose bibs. Recycle is primarily used for wash down purposes in the Lion’s holding quarters since May Recycle is primarily used for wash down purposes in the Lion’s holding quarters since May 2005.

9 LNQ’S RECYCLE & POTABLE SYSTEM RECYCLE LINE LION’S WASH-DOWN LINE POTABLE SERVICE WATER PHYSICAL SEPARATION

10 INCIDENT DESRIPTION February 27, 2006 February 27, 2006 DW scheduled a meeting with Zoo staff DW scheduled a meeting with Zoo staff Discuss a means of temporarily supplying the Zoo’s recycle system with potable water Discuss a means of temporarily supplying the Zoo’s recycle system with potable water Accommodate recycle system construction Accommodate recycle system construction Conceptual Plan Conceptual Plan Physically disconnect the ‘recycled source’ at LNQ Physically disconnect the ‘recycled source’ at LNQ 2-Inch Diameter Pipe 2-Inch Diameter Pipe Cut & Cap Cut & Cap Connect the ‘potable line’ as the new source protected by a Reduced Pressured Zoned Backflow Prevention Device (RPZ) Connect the ‘potable line’ as the new source protected by a Reduced Pressured Zoned Backflow Prevention Device (RPZ)

11 INCIDENT... During the meeting on Feb 27 th During the meeting on Feb 27 th DW discovered the conversion was done incorrectly DW discovered the conversion was done incorrectly A direct “Cross-connection” between the potable & recycled water lines was created A direct “Cross-connection” between the potable & recycled water lines was created The Zoo’s pump station was operating during the discovery The Zoo’s pump station was operating during the discovery

12 CROSS-CONNECTION RECYCLE LINE CROSS-CONNECTION POTABLE SERVICE WATER

13 ACTIONS TAKEN Denver Water Personnel & Zoo Personnel surveyed the potable system for contaminated drinking water (Recycle) Denver Water Personnel & Zoo Personnel surveyed the potable system for contaminated drinking water (Recycle) Used Specific Conductance Meters (µS) Used Specific Conductance Meters (µS) Potable Source = 300 µS Potable Source = 300 µS Recycle Source = 700 – 900 µS Recycle Source = 700 – 900 µS

14 ACTIONS… Utilized Zoo’s Engineering Drawings & Tested Conductivity Utilized Zoo’s Engineering Drawings & Tested Conductivity Fire Hydrants Fire Hydrants Water Fountains Water Fountains Sink Taps Sink Taps Potable Water Service Lines Potable Water Service Lines DW’s Distribution System DW’s Distribution System Outside Zoo’s property Outside Zoo’s property

15 ACTIONS… Collected bacteriological samples Collected bacteriological samples Drinking Fountains Drinking Fountains Break Room Taps Break Room Taps Food Vendors Food Vendors Pending the bacteriological results Pending the bacteriological results DW recommended isolating the Zoo’s system DW recommended isolating the Zoo’s system Prevent public contact with the drinking water until further notice Prevent public contact with the drinking water until further notice No Human Consumption No Human Consumption

16 INVESTIGATION RESULTS The conductivity results showed The conductivity results showed Small portion of the Zoo’s potable system was contaminated with Recycle water Small portion of the Zoo’s potable system was contaminated with Recycle water LNQ’s Domestic Service Line LNQ’s Domestic Service Line 3-inch diameter x 345-ft 3-inch diameter x 345-ft Zoo’s Distribution Main Zoo’s Distribution Main Service to the LNQ bldg. Service to the LNQ bldg. 8-inch diameter x 30-ft 8-inch diameter x 30-ft

17 Zoo's POTABLE DISTRIBUTION SYSTEM CONTAMINATED SERVICE

18 CONTAMINATED SERVICE LINE & WATER MAIN

19 CORRECTIVE MEASURES Remove the Cross-connection between the Potable & Recycle Line Remove the Cross-connection between the Potable & Recycle Line Physically separate the two systems Physically separate the two systems

20 APPROVED PHYSICAL SEPARATION RECYCLE LINE APPROVED SEPARATION POTABLE SERVICE WATER

21 CORRECTIVE MEASURES… Flush, Disinfect, Test Contaminated Service Lines & Distribution Water Main Flush, Disinfect, Test Contaminated Service Lines & Distribution Water Main Ozonation Method = 1.0 mg/L Dosage Ozonation Method = 1.0 mg/L Dosage Kills Pathogenic Organisms Kills Pathogenic Organisms Kills Cryptosporidium Kills Cryptosporidium Collected Bacteriological Samples Collected Bacteriological Samples Service Lines Service Lines Distribution System Fire Hydrant Distribution System Fire Hydrant

22 CORRECTIVE MEASURES… Ensure the Zoo complies with Recycle Water Regulations Ensure the Zoo complies with Recycle Water Regulations Backflow Prevention Backflow Prevention Marking & Signage Marking & Signage Create a Management of Change Protocol Create a Management of Change Protocol Ensure Zoo staff & contractors have approval for future modifications Ensure Zoo staff & contractors have approval for future modifications Provide additional training to Zoo staff Provide additional training to Zoo staff Regulations Requirements Regulations Requirements Protect the public water system from contamination Protect the public water system from contamination

23 CONCLUSION The Cross-connection was removed The Cross-connection was removed All bacteriological results from the initial water quality survey were negative All bacteriological results from the initial water quality survey were negative All bacteriological results from disinfection process were negative All bacteriological results from disinfection process were negative The Zoo has “High Quality H 2 0” The Zoo has “High Quality H 2 0” Most Important… Most Important…

24 MOST IMPORTANT KEEP FRED’S FRIENDS LOCKED UP “AT ALL TIMES”!

25 Q&A ?


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