20120142 Ver 1_RE R3421C silt loss at L Lt 427+00_20180717

Carpenter,Kristi
From: King, Art C
Sent: Tuesday, July 17, 2018 3:29 PM
To: Norton, April R; Andy Williams
Subject: RE: R3421C silt loss at L Lt 427+00
April,
Yes; we require that the contractor report sediment losses within 24 hours, when
possible. This is not an uncommon occurrence for a couple of reasons. One reason is
that many contractors don't work a full schedule, or deploy a full staff on Fridays (some
occasionally don't work at all) to allow their out of town employees to go home for the
weekend, so there fewer people on the site to inspect each location and catch these
things. If the rain event ends either late in the day, or at night on a Thursday it's a good
possibility that a blowout won't be found until Monday, especially on a larger project
like this one with many JD sites to check. Some sites are also not easily accessible right
after a heavy rain event, which can also delay their inspection. Another issue specific to
this project is that it is winding down. I would guess that the project is about 85% to
90% completed, with much of the inspectors attention focused on paving prep, or actual
paving. The DOT and contractor construction trailers have been removed, and much of
the inspection staff has been reassigned to other projects. The smaller inspection staff
will take a little longer to go through the project to check all of the potential failures
locations. The particular site in question was a stable site that had been completed a
while ago; it was properly matted, and had already established a decent grass cover, so
this wouldn't necessarily be the first site they would have inspected. The main thing is
that they did find this one early Monday morning, and reported as soon as they found it.
I forwarded the information to you when I came in from the field later that day and
went through my email. We always try to report problems ASAP but, thing do get
delayed or missed on occasion despite our best efforts.
Thanks,
Art
From: Norton, April R
Sent: Tuesday, July 17, 2018 2:19 PM
To: King, Art C; Andy Williams
Subject: RE: R3421C silt loss at L Lt 427+00
Thank you for the information, Art.
The Multi-Sensor Precipitation Estimate For July 12, 2018 is attached. The rainfall
occurred on Thursday, July 12, 2018; however, it appears as though the sediment loss
was not initially reported until Monday morning, July 16, 2018.
Do you require the contractors to report the sediment loss to you within 24-hours?
Thanks,
April

From: King, Art C
Sent: Monday, July 16, 2018 4:05 PM
To: Andy Williams <[e-mail]>; Norton, April R
<[e-mail]>
Subject: FW: R3421C silt loss at L Lt 427+00
I just received this sediment loss report from the project inspector. The reported rainfall
was approx. 3" in two hours. The measures were in place but were overwhelmed. The
soil in the area area has a very high sand content, and has always been unstable. The
contractor has already started clean up.
Please let me know if you need additional information.
Art
From: McInnis, Robert R
Sent: Monday, July 16, 2018 7:59 AM
To: King, Art C
Subject: R3421C silt loss at L Lt 427+00
Art, the project received a heavy rain overnight Thursday. We had some silt loss
at L Lt 427+00 where Basin 9.1F was removed and the rock lined ditch was
installed. Silt fence was installed on the slope side to prevent silt washing into the
rock lined ditch. Silt washed under the stone from the pipe outlet. We have
approximately 3-4 cubic yards of material offsite in this area. I have attached
photos of the silt loss. Forces are going to need to remove an area of controlled
access fence and track down the slope in this area to retrieve the material. If you
need any further information you can contact me. Thank you!
Sent from my
iPad

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