Document ID: EPA-HQ-OAR-2009-0443-0142
Agency: epa
Document Type: Supporting & Related Material
Title: 
Posted Date: 2010-07-08T04:00Z

EFT Info

Kahn, Joseph 

to:

Lynorae Benjamin, Steve Scofield

06/04/2010 06:46 PM

Cc:

"Vielhauer, Trina"

 

 

 

Lynorae and Steve,

 

Hillsborough County confirmed that the facility is on track with the
construction schedule we sent (attached again), which includes four
phases that run until 2012.  The full enclosure of existing equipment
(Phase 1A) is scheduled to be completed in October 2010.  There are
enclosures associated with each phase, which are shown in the schedule,
but as I understand it, these phases include new equipment to be
installed.  Construction started February 4, 2010, and contaminated
soils have been remediated by now.  All paving will not be completed
until March 2012.

 

An inspector from Hillsborough County took photos today that illustrate
the extent of construction activities at the site and show how serious
this effort is at rebuilding the facility.  Please take a look at
those.  (To keep the e-mail file size manageable I’ll send more
photos in two more e-mails.)  You’ll see why they won’t complete
paving, for example, for some time.

 

Regarding the City of Tampa WWTP, Hillsborough County advised that the
City operates a sludge dryer at the site. Sometimes lead waste is
discarded in residential or commercial drains, so the sludge has a small
lead content.  It is a 75 MGD facility, so even a trace amount of a
contaminant can appear to contribute to emissions.  In this case, the
lead was over estimated.  Actual lead emissions from that site were
most probably less than 100 pounds in 2005.

 

For the 2005 NEI, the City submitted a lead calculation and used an
emission factor for sludge incineration -- not drying.  Their factor
assumed a hotter temperature, thus volatilizing more lead, and did not
include control efficiency for their associated cyclone and RTO.  The
County estimates that process operations and controls are such that only
about 10% of the lead in sludge would have been emitted.  So, again,
the NEI appears to be a large overestimate.

 

Please let me know if you have other questions, or need more
information.  Thanks.

 

Joe

 

 

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