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Sewage Treatment Design Criteria Observed Data and Future Projections

Sewage Treatment Design Criteria Observed Data and Future Projections. Comments by David Langley. Major Issues. - Sewage System Planning and Design Work from 2006 to 2010 was based on sewage system data from 2000 to 2003.

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Sewage Treatment Design Criteria Observed Data and Future Projections

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  1. Sewage Treatment Design CriteriaObserved Data and Future Projections Comments by David Langley

  2. Major Issues - Sewage System Planning and Design Work from 2006 to 2010 was based on sewage system data from 2000 to 2003. - No significant time was provided by the CRD Study Teams to update the sewage system data base - Many design assumptions and estimates do not fit current measurements. - Several “lack-of- fit” factors can be demonstrated

  3. Existing Regional Sewage Flows (ADWF) and GWI Estimates Regional Sewage Flows (ADWF) Observed and Estimated

  4. Sewage Makeup: Proportions of Sanitary and GWI Flows (%) GWI = Study Estimate Sanitary = Total – GWI Estimate

  5. Population and Industrial-Commercial- Institutional Growth Projections LWMP: Liquid Waste Management Plan RGS: Regional Growth Strategy

  6. Saanich East Flows Highly Over Estimated

  7. Effect of Capacity on Plant Capital Cost

  8. Conclusion • It is encouraging that reviews of the Design Criteria are now underway under the leadership of Jack Hull • Many issues, particularly the clear measured evidence of declining regional sewage volumes, are fundamental to decisions on the overall system design and costs. These issues must be faced now. • With an updated data base for sewage flow estimates, a new assessment may well show that a Central Treatment Plant ( McLoughlin and/or an Upper Harbour Plant) can provide 20 years of capacity for the Region. • Saving $150 million for a Saanich East plant and avoiding or substantially delaying construction of an expensive Westshore plant must be in the overall regional interest.

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