HomeMy WebLinkAboutWPO201000057 Correspondence 2022-06-24 Dan Ratzlaff
From: Dan Ratzlaff
Sent: Friday, June 24, 2022 8:50 AM
To: scott@collins-engineering.com
Cc: Joe Simpson
Subject: RE: WP02010-57/Avinity
Joe and Scott,
Just following up on Avinity.
I believe our last correspondence focused on the riser in the wet pond and the fact that the As Builts submitted note 5-
5" orifices in the riser structure. I inspected the structure and found only 3, with the other two having been parged, or
plugged. To close this project (I believe we already received DEQ permit termination approval on 4-19-22 a bit
prematurely) we just need a revised/updated As Built showing 3-5" orifices, or the two that have been plugged need to
be unplugged. As soon as we get the revised As Built, or notification that two of the orifices have been unplugged (I'll go
out again to verify), we can close this out. Please let me know if you have any questions.
Dan Ratzlaff
Manager of Engineering Compliance
Albemarle County
dratzlaff@albemarle.org
434-296-5832 x3438
401 McIntire Road, North Wing, Charlottesville, VA 22902
From: Dan Ratzlaff
Sent: Friday, May 6, 2022 3:39 PM
To: scott@collins-engineering.com
Cc:Joe Simpson <Simpson@riverbenddev.com>
Subject: WP02010-57/Avinity
Scott,
I'm trying to wrap up Joe's Avinity project and get the bond release paperwork to Frank to sign, but I've got a couple
questions first. I see that the 2010 plan had originally included underground detention, but that that design was
amended a few years later under WP02013-44 I believe. The current approved plan calls for a retention basin at the far
east end of the property. I see your As Built certification dated October 19, 2020. I have the following questions:
1. The plan calls for a forebay with a gabion basket dam with crest about 4" lower than the 30" invert out elevation
of the main inlet pipe into the basin, and that it is to be "submerged". When I was on site yesterday the pond
appeared to be at the invert out elevation, or slightly lower. I couldn't see the gabion basket dam in the water
where the plan calls for it. Can you please verify that its there;
2. The principal spillway is designed to have 5/5" orifices in it. I saw 3 and at least one area where it appeared an
orifice had been parged, or plugged. Can you please clarify this;
3. The same structure noted in #2 above is leaking at one of the ring's joints below the 5" orifices' elevation. I have
always assumed that a leaking structure needed to be repaired before bond was released. Can you clarify
please.
Thanks Scott for your help on this.
Dan Ratzlaff
Manager of Engineering Compliance
Albemarle County
dratzlaff@albemarle.orq
434-296-5832 x3438
401 McIntire Road, North Wing, Charlottesville, VA 22902
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