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

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Manhole covers.... the sequel

Posted by Frank Burdick on 26 Feb, 2014
Category: No category

Attached find a "cut sheet" on the gasketed manhole cover that would help prevent I/I from the sanitary sewers.

Why can't we include the installation of these in our final recommendation?  
These should at least be installed in low lying areas, in all targeted neighborhoods, and at manholes affected by new road construction.

What is the cost per each location for the city's labor and material?
How many man hole covers are in each target neighborhood?

Lets focus on this while it is relevent topic as we watch the snow melt and drain down the pick holes

Comments

Joe Conen on 27 Feb, 2014:

There may be good reason to include this in our final recommendation. It may be a very cost effective way to reduce treatment costs from I&I as well as provide additional margin, especially in the largest storms.
Joe

Judy Hanway on 28 Feb, 2014:

Robert and Nick,

Could you research the cost for this as Frank has asked?   We would want to know the unit cost as well as the installation costs (labor etc). 

Also, is there any reason that sanitary sewer manhole covers might need to be ventilated? I'm wondering about sewer gas etc.

Thanks. jh

Lori Byron on 12 Mar, 2014:

[CITY]

Gasketed manhole covers can be considered as part of the alternatives analysis. The potential of hydrogen sulfide gas accumulation is an issue that would need to be evaluated as part of this alternative.

Re: What is the cost per each location for the city's labor and material?

OHM will research and provide information.

A.      Number of sanitary manholes located in each target neighborhood:
 
Dartmoor – 216
Bromley – 55
Orchard Hills – 90
Morehead – 260
Glen Leven – 259
TOTAL – 880

Lori Byron on 7 Nov, 2014:

Update from the [CITY]

A.  The City has begun to implement the gasketed manhole covers in the city.  In addition, additional funding is being programmed into the City’s Capital Improvement Program for the implementation of a citywide program for sealing lids and other manhole repairs/rehabilitation in flood prone and high risk areas. The potential of hydrogen sulfide gas accumulation is an issue that will need to be evaluated as part of the program.