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City of Ann Arbor SSWWEP - Citizens Advisory Committee Coordination — City of Ann Arbor

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Likelihood of Potential Solutions

Posted by Robert Czachorski on 26 Feb, 2014
Category: No category

Folks, 

The attached document was prepared by the technical team (the City and OHM) to help the CAC during their exploration and brainstorming of alternatives.  The document outlines the technical team’s opinion of the likely feasibility and effectiveness of the alternatives presented at the February 13 CAC meeting, based on our knowledge of the City’s system and these alternatives. This document speaks only to the team’s opinion on feasibility and effectiveness based on what we know now. This opinion may change, as we proceed with the study. All options are still on the table. We thought getting the technical team’s input at this stage would be valuable and helpful for the CAC to focus the brainstorming session tomorrow night. At the meeting, we could review the basis of the categorization in the document, and even change the categories and add to the document based on what is discussed and new ideas explored.  I will bring several copies to the meeting. 

This document does not include items like cost effectiveness or community values.  Those items require the risk evaluation, capacity assessment, alternative analysis, and CAC deliberations, which are the next steps of the project.

Take care,
Robert

Comments

Michelle Lovasz on 26 Feb, 2014:

Wow, thanks Robert.

Joe Conen on 27 Feb, 2014:

Why is "Remove D.C.I.A – Directly Connected ImperviousArea" not likely feasible? What do we know about this source of I&I?
Joe

Robert Czachorski on 27 Feb, 2014:

Joe - The City is not aware of large DCIA sources at this time, so its just based on our current understanding.  If the City finds these sources, they should be moved right away.  So in one regard they are actually 100% - any of them found should get removed. DCIA removal is always the most cost effective thing to do.  

At this point, we do not believe that there is enough of it to solve the problem.  That does not mean that we are opposed to searching for it to verify or change this belief.  In fact, I think it might be a good idea to do a pilot sanitary sewer evaluation survey (SSES), particularly in Glen Leven, to find out what other sources of wet weather inflow and infiltration might be out there.

Take care,
Robert

Michelle Lovasz on 28 Feb, 2014:

I am behind that.