4h - Inflow Reduction Program Costa Mesa Sanitary District
…an Independent Special District
Protecting our community’s health and the environment by providing solid waste and sewer collection services.
www.cmsdca.gov
Memorandum
To: Board of Directors
From : Scott Carroll, General Manager
Date: October 15 , 2013
Subject: Inflow Reduction Program
Summary
The Board requested an update from staff regarding the Districts Inflow Reduction
Program. Inflow is when surface water from rain and/or irrigation system enters through
manhole covers and into the sanitary sewer system. Too much inflow, such as a 100 -year
storm, can inundate sewer treatm ent plants and cause wastewater to backup and spill
onto surface streets.
Staff Recommendation
That the Board of Directors receive and file this report.
Analysis
On June 19, 2012, the District’s Operations Committee received a presentation from staff
about the District’s Inflow Reduction Program and directed staff to plug and seal an
additional 200 manholes to reach a total of 1,008 manholes plugged and sealed out of
4,560 manhole cover s. The purpose for plugging and sealing manhole covers is to reduc e
surface water from entering the sewer system and inundating sewer treatment facilities,
and to achieve Orange County Sanitation District’s (OCSD) goal of 2.0% rainfall ingress.
The District focused on plugging and sealing manhole covers that are located ten feet or
less from curb and gutter in streets that are known to flood during rain events. In addition,
manhole covers located in alleyways will be plugged and sealed because alleys do allow
surface water to flow well and will usually retain water. Atta ched is a map illustrating the
locations of 825 plugged and sealed manhole covers. Staff is currently working on
Board of Directors
October 15 , 2013
Page 2 of 3
revising the map to illustrate over 1,000 plugged and sealed manhole covers. The program
works as follows:
• The maintenance crew and the Distr ict’s contractor, currently National Plant
Services (NPS), will plug and seal manhole covers that meet the criteria identified
above. A work order will be created identifying the manhole covers to be plugged
and sealed.
• Manhole covers that are already plu gged and sealed will be removed for annual or
biennial cleaning of sewer mainline and then plugged and sealed again after the
cleaning is finished.
• Every year, staff will purchase manhole covers without vent holes to replace with
manhole covers that are pl ugged and sealed. This will reduce returned trips from
staff to re -plug vent holes that are missing plugs. Staff purchases thirty to forty
manhole covers without vent holes a year.
• After a significant rain storm, District Engineer will perform calculatio ns to
determine if the program is meeting OCSD’s rain ingress goal of 2.0%. However,
the last calculation was performed in 2010, which was the last time Costa Mesa
experience a significant rain storm (storms greater than one inch of rain).
Staff is exploring replacing vent hole plugs with plastic caps, as shown in the attachment.
Currently, the District is using corks that at times would be pushed into the sewer system.
Other times, the corks would get dislodged from vehicle s driving over t hem. The District’s
Maintenance Supervisor, Steve Cano, has experience using these caps at his previous
employer and found them to very useful. They don’t get dislodged or pushed into the
sewer system.
Strategic Plan Element & Goal
This item complies wit h Strategic Element 1 .0., Sewer Infrastructure and Strategic Goal
No. 1.2 ., Inflow Reduction Program.
Legal Review
Not applicable
Environmental Review
Plugging and sealing manhole covers is categorically exempt under the California
Environmental Quality Act (CEQA) (Public Resources Code Section 21000 et. seq.) under
Section 15301 Existing Facilities as “Class 1 consists of the … maintenance … of existing
public or private structures”, as further described in Section (b) as “Existing facilities of
both investor and publicly -owned utilities used to provide …. sewerage …”
Board of Directors
October 15 , 2013
Page 3 of 3
F inancial Review
T he cost to purchase manhole covers without vent holes along with the required rings is
$355 per manhole cover. In addition, it costs the District an additional $23.95 per manhole
to re -plug and re -seal manhole covers after the mainline is cleaned from NPS.
Staff is estimating the cost to purchase caps to p lug vent holes is $135.00 for acquiring
2,500 caps
Public Notice Process
Copies of this report are on file and will be included with the entire agenda packet for the
October 15 , 2013 Bo ard of Directors study session meeting at District headquarters and
on District’s website.
Alternative Actions
1. Direct staff to report back with more information
Attachments A: Map illustrating plugged and sealed manhole covers.
B: Plastic caps for plugging vent holes.
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Attachment B
Sample Plastic Cap for Plugging Manhole Cover Vent Holes