20070971 Ver 1_More Info Received_20141126

Strickland, Bev
From: Devane, Boyd
Sent: Wednesday, November 26, 2014 10:48 AM
To: Strickland, Bev
Subject: FW: Modification to Stormwater /Diffuse flow plan for Mellon Downs
Attachments: Mellon Downs - Pond #2 - 11.25.14.pdf
Please file this email and the attached document in 07 -0971 Mellon Downs. thanks
From: Devane, Boyd
Sent: Wednesday, November 26, 2014 10:33 AM
To: 'Jonathan L. McDaniel'
Cc: Scarbraugh, Anthony
Subject: Modification to Stormwater /Diffuse flow plan for Mellon Downs
After reviewing the changes to the stormwater /diffuse flow plan that was provided in the 11/25/14 " Stormwater
Detention Pond #2 Detail Sheet ", we have concluded that the modifications made and documented on that plan will
satisfy the Division's stormwater treatment and diffuse flow requirements of the Authorization Certificate that was
issued by our Division on July 12, 2007.
From: Jonathan L. McDaniel [ mailto :jmcdanielCa)bizec.rr.com]
Sent: Tuesday, November 25, 2014 6:16 PM
To: Devane, Boyd
Subject: Mellon Downs
Boyd,
As discussed, attached is a revised plan showing the outlet pipe discharging directly into the existing ditch. To address
diffuse flow requirements, I have revised the outlet structure so only the water quality volume discharges into this
pipe. This pipe will only have the 0.04 cfs from the 1.25" orifice, and the velocity will be 1.68 ft /s. I was able to do this
by adding a vegetated spillway at the storage volume elevation, so any excess flows will pass across this 50' wide
spillway instead of going into the outlet structure and 12" pipe. This spillway also acts like a vegetated filter before
sheet flowing into the riparian buffer at a velocity less than 2 ft /s. Please let me know if you need anything else.
Thanks,
Jonathan L. McDaniel, PE
Parker & Associates, Inc.

Engineers * Surveyors * Planners
(910) 455 -2414
Firm License Number - F -0108
www.parkerengineeringandsurveying.com

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