20200504 Ver 1_Email string between Raleigh and PE regarding Rip rap at road crossings_20200413

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Kevin Martin
From:Travis Tyboroski <[e-mail]>
Sent:Monday, April 13, 2020 9:30 AM
To:Kevin Martin
Cc:Jon Callahan
Subject:FW: Sumner pointe
See below re: City’s riprap requirements.

Travis Tyboroski, PE

From: Morton, Gary <[e-mail]>
Sent: Monday, March 30, 2020 4:46 PM
To: Jon Callahan <[e-mail]>
Cc: Travis Tyboroski <[e-mail]>; Rodgers, Ashley <[e-mail]>
Subject: RE: Sumner pointe

Jon,

Same answer as before – no specific arbitrary requirement for rip rap but the need for the stream bed to be non-erosive
is still there. If your design is not changing characteristics of the stream and its flow then no need to add rip rap.

Gary

Gary Morton
Senior Stormwater Reviewer

City of Raleigh
Engineering Services Department
Stormwater Management
POB 590 Raleigh, NC 27602
(p) 919-996-3517
[e-mail]
twitter.com/sustainableral
raleighnc.gov

Please note that email sent to/from this address is subject to public records laws and may be disclosed to third parties.

From: Jon Callahan <[e-mail]>
Sent: Monday, March 30, 2020 4:33 PM
To: Morton, Gary <[e-mail]>
Cc: Travis Tyboroski <[e-mail]>; Rodgers, Ashley <[e-mail]>
Subject: RE: Sumner pointe

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Thanks and I agree on an open bottom which is exactly why we are designing a bottomless arch. What about a box
culvert which is buried 1’? Does the 1’ bury remove the requirement for rip rap energy dissipater? Seems like scour
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would be less of a concern with a buried invert. Army Corps is not requiring it, I just need to include it in the permit if
the City will require it.

Jon Callahan, PE, PLS
President
JAECO
Consulting Engineers and Land Surveyors
333 Wade Ave, Raleigh NC 27605
ph(919)828-4428, fax[phone]

From: Morton, Gary [mailto:[e-mail]]
Sent: Monday, March 30, 2020 4:15 PM
To: Jon Callahan
Cc: Travis Tyboroski; Rodgers, Ashley
Subject: RE: Sumner pointe

Jon,

I added Ashley to the CC on the email so she can correct me if needed. If you are designing an open bottom culvert
then no rip rap would be required. That of course is working with the assumption that you are not changing the flow or
other characteristics such that a change in lining is required in order to be non-erosive.

I understand the desire to make sure that the City is not going to require differently than what you are submitting to the
Corps. You should be OK.

Thanks for checking,

Gary

Gary Morton
Senior Stormwater Reviewer

City of Raleigh
Engineering Services Department
Stormwater Management
POB 590 Raleigh, NC 27602
(p) 919-996-3517
[e-mail]
twitter.com/sustainableral
raleighnc.gov

Please note that email sent to/from this address is subject to public records laws and may be disclosed to third parties.

From: Jon Callahan <[e-mail]>
Sent: Monday, March 30, 2020 3:50 PM
To: Morton, Gary <[e-mail]>
Cc: Travis Tyboroski <[e-mail]>
Subject: Sumner pointe

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Gary, There are 2 road crossings on this project, to minimize impacts and mitigation we are proposing a bottomless
arched culvert on one crossing and a box culvert on the other. The bottomless arch will not have any rip rap as we are
not disturbing the creek channel and simply spanning over it. The box culvert will be buried 1’ for aquatic life transfer,
but our preliminary plans do not call for rip rap in order to minimize channel impacts. The Corps has asked if the City
will require rip rap, so rather than revising the permit later, I would like to provide them with an accurate answer. Is
there a specific Raleigh requirement to show rip rap in the stream channel at the box culvert?

Jon Callahan, PE, PLS
President
JAECO
Consulting Engineers and Land Surveyors
333 Wade Ave, Raleigh NC 27605
ph(919)828-4428, fax[phone]