Email from Chad - NCS000312

Bennett, Bradley
From: Broadway, Chad <[e-mail]>
Sent: Tuesday, May 22, 2018 8:09 AM
To: Bennett, Bradley
Subject: [External] RE: [External]DART Acquisitions LLC - NCS000312
Hi Bradley,
You're correct, the pond at DART is a concrete lined basin that is equipped with a manually activated gate valve, and the
valve remains closed except during a planned discharge. I think keeping the language specifying sample collection
within 30 minutes of initial discharge is probably fine. If the site had more of a TSS issue, then I might be interested in
the sample being collected closer to the initial release to ensure that the lower portion of the water column is sampled
and see what may be sorbed to the sediment, but I'm not sure that is a big factor here. The nature of this pond probably
prevents a true "first flush" sample, but I think it yields a pretty consistent sample.
For BOD, the 6.0 mg/L is our In -Stream action level, so I wouldn't necessarily consider their 13.6 value to be an issue for
us (considering the size of the receiving stream) or that it necessitates the addition of a BOD parameter. After reading
over our monitoring results table, I probably need to update the notes to more clearly specify these are in -stream action
levels. I'll defer to your judgement on copper... I think I've become somewhat desensitized to lower level exceedances
considering how regularly we see it. From approximately 120 sites and 10 years of monitoring, copper at this site is in
our lower 25th percentile and represents half of our median value and approximately 20% of the average value. I think
the source of copper at this site is likely from heavy trucks for material delivery more so than site materials/processing
exposure. Let me know if you need any additional information. Thanks for keeping us in the loop.
Chad Broadway, Environmental Specialist
Charlotte -Mecklenburg Storm Water Services
Mecklenburg County Water Quality Program
2145 Suttle Avenue
Charlotte, NC 28208
704-280-1497 (mobile)
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From: Bennett, Bradley [mailto:[e-mail]]
Sent: Monday, May 21, 2018 9:22 PM
To: Broadway, Chad <[e-mail]>
Subject: [External]DART Acquisitions LLC - NCS000312
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Hey Chad,

I've been look at the info we have on this facility (4132 Pompano Road) and the information you provided on
the facility. Just had a couple of quick questions. First is related to the pond that collects their stormwater. It
appears that they manually discharge from the pond, is that correct or does it discharge in response to a storm
event in some way? Just trying to figure out if there need to be any specific criteria for sample collection? Do
you still thing it s okay to say within first 30 minutes of discharge? Second question is on monitoring results
you guys found in January. Looks like your monitoring showed they were over the benchmark for CU. Would
you recommend that we add CU monitoring to their permit? Your data also showed BOD over your action
level but less than our benchmark. The permit already has COD. Right now I plan to keep COD. Would you
suggest instead requiring BOD?
Thanks for your thoughts on this.
N. H1.
Bradley Bennett
Stormwater Program Phone: [phone]
NC Division of Energy, Mineral & Land Resources Fax: [phone]
1612 Mail Service Center Email: bradley.bennett(@ncdenr.gov
Raleigh, NC 27699-1612
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