SW3190505_Add Info_20200207

Georgoulias, Bethany
From: Farkas, Jim J
Sent: Friday, February 7, 2020 3:39 PM
To: Kit Broome; Vince Keene
Subject: SW3190505 - Courtyards on Lawyers Road
Kit/Vincent,
I was looking over the additional information you provided on 1/7. Everything looks good except for a few small issues:
- Wet Pond 1 WQ Elevation
o The design volume for wet pond 1 is 124,277 cf. The cumulative storage volume of wet pond 1 at
elevation 663 is 2.083 ac-ft = 90,000 cf (per the provided stage -storage table). It is therefore impossible
for the temporary pool elevation (based on the design volume) to be below elevation 663. Based on the
provided stage -storage table, the actual temporary pool elevation should be closer to elevation 663.75.
o Per the above comment, the secondary orifice is below the temporary pool elevation and should be
taken into consideration in the drawdown calcs. It does not appear that this secondary orifice has a
noticeable effect on the drawdown rate, but it should still be included in the calcs.
- Wet Pond 2 WQ Elevation
o Like wet pond 1, the temporary pool elevation does not appear to be correctly calculated/shown. Based
on the provided stage -storage table, the actual temporary pool elevation should be closer to elevation
665.8.
o Per the above comment, the secondary orifice is below the temporary pool elevation and should be
taken into consideration in the drawdown calcs. It does not appear that this secondary orifice has a
noticeable effect on the drawdown rate, but it should still be included in the calcs.
- Supplement-EZ Form
o Wet Pond Sheet, Wet Pond 1, Line 28 —The average depth of the main pool did not appear to be
updated to coincide with the revised calcs (Average Depth = 6.38 ft). Please revise for consistency.
Please provide the following:
- Applicable revised plan sheets (2x full-sized hard copies & 1x electronic copy uploaded to Laserfiche).
- Corrected wet pond page of the Supplement-EZ Form (2x hard copies & 1x electronic copy uploaded to
Laserfiche). The change is so minor that you don't need to re-sign/seal the form.
- Any other submittal material that is impacted by addressing the above comments, (Any applicable hard copy(s)
& electronic copy(s) uploaded to Laserfiche). If the calculations need to be corrected, we only require 1 hard
copy.
- Title sheet indicating the date of the latest revision to the plans (2x full-sized hard copies).
Since these are really minor things, once I get the hard copies, anything else that may have changed from addressing
these issues, and the documents are uploaded to Laserfiche (Provided everything is still in order), we can issue the
permit without having to do another formal 30 day review.
Let me know if you have any questions.
Jim Farkas
Environmental Engineer
North Carolina Department of Environmental Quality
Division of Energy, Mineral, & Land Resources — Stormwater Program

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