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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