HomeMy WebLinkAboutSDP201000029 Review Comments Letter of Revision 3 2014-04-17John Anderson
From: Rachael McKinney [rmckinney @rkk.com]
Sent: Thursday, April 17, 2014 10:16 AM
To: John Anderson
Cc: Glenn Brooks
Subject: Re: Martha Jefferson Health Services Outpatient Care Center @ Proffit Road
Good morning John,
I apologize for the delayed response in getting back to you. I am only in the office part -time at the moment, as I
am just coming back from an extended maternity leave and I am not quite back to full -time yet.
Anyways, I have re -run the spread analysis for Structure #10 as we discussed on Friday. Looking at the original
analysis I gave you, I had used standard DI -1 parameters (i.e. "Clear Area of Orfice Opening" = 2.33 square
feet). After looking at the photos you sent, I have realized that you have a valid point regarding the clear area of
the orfice opening. So, I have re -run the analysis using a clear area of orf'ice opening = 0.375 square feet.
With that being said:
• The Q Intercepted remains 1.93 cfs
• With a Q Carryover = 0 cfs
• The revised Spread @ Sag = 5.59'
• The revised Depth of Water = 0.30'
Please feel free to contact me if you have any additional questions or concerns.
Thank you,
RACHAEL T. McKINNEY, P.E.
Senior Engineer
RK &K
2100 E. Cary Street, Suite 309
Richmond, VA 23223
804.771.9118 D
804.782.1903 P
804.782.2142 F
www.rkk.com
From: "John Anderson" <janderson2(D_albemarle.org>
To: "Rachael McKinney" <rmckinney(a rkk.com>
Cc: "Glenn Brooks" <GBROOKS(@albemarle.org>
Sent: Friday, April 11, 2014 3:37:57 PM
Subject: RE: Martha Jefferson Health Services Outpatient Care Center @ Proffit Road
RF — SDP201000029
Rachael,
Thanks for help with item #2, RK &K, 3 -19 -14 letter to Albemarle County. "The approved site plan reflects that drainage
structure #10 is a DI -213, L =4. As -built conditions provide an H -20 Rated Grate & Inlet" (Mar -19 letter).
I visited the site today, have attached 3 photos, and will send 6 more.
As -built grate dimensions (ref photos):
- Overall: 16" x 16"
-14 slots @ 1.125" x 6 ", ea
- Potential for 1.5 x 4 ( =6) slots to become (permanently) obstructed
-Net grate clear space= 14 — 6, or, 8 slots
My question is, from a 10 -yr storm hydraulic perspective, how does Net clear space of the as -built grate compare with
(approved site plan) drainage structure #10?
Thank you, Rachael.
John
From: Rachael McKinney [mailto:rmckinney @rkk.com]
Sent: Friday, April 11, 2014 9:39 AM
To: John Anderson
Subject: Martha Jefferson Health Services Outpatient Care Center @ Proffit Road
John,
It was a pleasure speaking with you this morning. Please let me know if you have any additional questions.
Thank you,
RACHAEL T. McKINNEY, P.E.
Senior Engineer
RK &K
2100 E. Cary Street, Suite 309
Richmond, VA 23223
804.771.9118 D
804.782.1903 P
804.782.2142 F
www. rkk. com
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