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Clean Watersheds Needs Survey (CWNS) 2012
CWNS Technical Data Dos and Don'ts
Presenter:Alejandro Escobar, Tetra Tech
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Session Overview Dos and Don’t will be shown with theoretical or real
examples. Based on most common problems in CWNS 2008. Most for traditional centralized collection and
treatment. I will answer questions as they are asked. Will have some time at the end for questions related to
dos and don’ts not related to the ones presented.
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Location
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Do: Enter a street address.Don’t: Enter a PO Box.
PopulationDo: Enter population for collection systems.Don’t: Try to enter population for treatment plants.
Treatment Plants have population automatically populated by the DEP based on the population from upstream collection systems.
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PopulationDo: All population entered should be real data.Don’t: Enter population placeholders. (e.g., 1, 2)
Need for population placeholders are usually an indication of other technical problems with the facility.
New facility types should eliminate the need for placeholders.
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PopulationNeed for population placeholders are usually an
indication of other technical problems with the facility.
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FlowDo: Keep present design and projected design flows the
same unless there is a change of increase capacity.Don’t: Make the future design flow less than the present
design.Exception: We have seen facilities’ excess capacity being
retrofitted for nutrient control. This would require a change of increase level of treatment.
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DischargeDo: Make collection systems discharge to treatment
facilities, other collection systems, or interceptors.Don’t: Try to make collection systems discharge to
surface water, evaporation, etc.Don’t: Make on-site systems discharge to surface waters.
(Hint: discharge method for on-site systems is NOT required)
FOLLOW THE WATER
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DischargeFOLLOW THE WATER
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Permits
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Do: Make permit type match facility/project type.Don’t: Assigns stormwater permits to POTWs, and vice
versa .Do: Enter an NPDES permit for all point source
facilities/project with a discharge to waters of the US. (ocean discharge, outfall to surface waters, overland flow with discharge)
Don’t: Enter NPDES permits as state permits.
Costs and Documents
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Don’t: Run cost curves and document needs for the same category (some exceptions may apply).Allowed: Documented costs for increase capacity and cost
curve for increase level of treatment.Don’t: Run cost curves for needs not justified by documents.
Not allowed: documentation showing a need to correct I/I used to justify running an increase level of treatment cost curve for the treatment plant.
Costs and Documents
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Do: Enter each document in the DEP.Don’t: Combine documents into a single document DEP entry.
Costs and Documents
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Do: Ensure that all projects/needs are accounted for only once. The same project costs may be in multiple documents.
Don’t: Enter new documents/needs until you have removed outdated documents from the DEP.
Costs and Documents
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Do: Enter all eligible needs as of January 1, 2012.Don’t: Enter costs for components funded or completed
before January 1, 2012.
If you already have the money then it’s not a need!!
ResourcesCWNS DEP is your best friend.
If the DEP does not allow you to do something there is a good chance there is a technical problem with your facility.
CWNS review team.It is better to ask questions than submit incorrect facilities
for review.CWNS 2012 User Manual
Coming Soon!
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Questions?
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