NC0089508_More Information (Requested)_20191010

DocuSign Envelope ID:F74FF7F1-8604-4D2C-8D2B-165E07E38BBF
ROY COOPER
cavernor
,M MICHAEL S. REGAN
Secretary
LINDA CULPEPPER
Director
NORTH CAROLINA
Environmental Quality
10/10/2019
CERTIFIED MAIL 7003 2260 0005 5380 5084
RETURN RECEIPT REQUESTED
Mr.Ed Lodics
KIWS Property,LLC
2941 Indiana Aveue
Winston Salem,NC 27105
Subject: Request for Additional Information
Draft NPDES Permit NC0089508
Kaba Access Controls(GW-REM Site)
Forsyth County
Dear Mr. Lodics:
The Division has reviewed your application,received on October 5,2018,for renewal of NPDES permit
NC0089508.To enable us complete our review in accordance with N.C.G.S. 143-215.1 and 15A NCAC 2H.0105,
please provide additional or revised information to address the following comments:
1. Please provide five(5)days of Total Hardness(CaCO3 or(Ca+Mg))data for the effluent.
2. Pleaseprovide a copyof the 126 PriorityPollutant scan for June 24,2015.
The NC 2007-2014 Water Quality Standard(WQS)Triennial Review was approved by the NC Environmental
Management Committee(EMC)on November 13,2014. The US EPA subsequently approved the WQS revisions
on April 6,2016 with some exceptions. The NC Division of Water Resources is required to implement the new
dissolved metal standards in all permits public noticed after April 6,2016.
The new standards for most metals include acute standards. Furthermore,the freshwater standards for several
metals are expressed as the dissolved form of the metals, and seven metals have hardness-dependent equations.
As a result,the Division will need site-specific effluent hardness data in order to calculate permit limitations.
Instream data will not be necessary because of the zero flow conditions(7Q10/30Q2=0)of the discharge. The
metals of concern for this permit renewal are Zinc,Copper and Chromium.
Reasonable Potential Analysis(RPA)was conducted using
evaluate dissolved Zinc,Copper and Chromium,a ea a ote y
data from the 2016,2017,2018,and 2019 126 Priority Pollutant Analyses. Results indicated a reasonable
potential to exceed the new dissolved metals standard for Copper,Zinc and Chromium VI.Consequently,the
following daily maximum limits(acute standard)and monthly average limits(in this case the acute standard)for
Total Copper,Total Zinc and Chromium VI could be applied for this permit renewal:
North Carolina Department of Environmental QualityDivision of Water Resources
p I
1617 Mail Service Center I Raleigh,North Carolina 27699-1617
919-707-3616

DocuSign Envelope ID:F74FF7F1-8604-4D2C-8D2B-165E07E38BBF
Mr. Lodics
Page 2 of 2
Parameter Outfall Monthly Average Limit Daily Maximum Limit
Total Copper 001 7.88 µg/L 10.47 µg/L
Total Zinc 001 125.7 µg/L 125.7 µg/L
Chromium VI 001 11.0 µg/L 16.0 µg/L
Total Chromium 001 Monitoring Only Monitoring Only
Please note that the hardness-dependent water quality standard for zinc typically results in a more stringent permit
limit for the acute total allowable metal verses the chronic value. In this situation,we use the acute total allowable
metal concentration as the limitation for both the Daily Maximum and the Monthly Average.Please note
calculation of the limits for Chromium VI is not hardness dependent.
To calculate the limits above a default hardness of 25 mg/L was entered for both the effluent and upstream values.
Since this facility discharges under zero flow conditions a value of 0 was entered for all stream flow data for
Outfall 001.Please note that under zero flow conditions a default value of 25 mg/L will be used for the upstream
Total Hardness.Additionally,the flow limit of 0.0432 MGD for Outfall 001 was used as the effluent flow. Since
the discharge is effluent dependent,the increase in flow to 0.0864 MGD will not result in any relaxation of these
limits. Calculation of final Copper and Zinc limits will be dependent on the effluent hardness data that we have
requested. For a summary of this information,please see the attached"Dissolved to Total Metal Calculator".
If no response is received within 60 calendar days [per 15A NCAC 2H.0107(b)],the permit will be renewed
without the benefit of the requested additional information. Therefore,a default effluent hardness of 25 mg/L will
be used to calculate effluent limits for Copper and Zinc as indicated above.
Please submit the additional information requested by one of the following:
Electronically: [e-mail]
Address For USPS: Physical Address for parcel packages:
Attention: Derek Denard Attention: Wren Tredford
Division of Water Resources Division of Water Resources
WQ Permitting Section—NPDES WQ Permitting Section—NPDES
1617 Mail Service Center 512 N. Salisbury Street
Raleigh,NC 27699-1617 (9th Floor-Archdale Bldg)
Raleigh,NC 27604
If you have any questions,please contact Derek Denard at 919-707-3618 or email at derek.denard(a,ncdenr.gov.
Respectfully,
DocuSigned by:
Zyix '
8328B44CE9EB4A1...
Linda Culpepper,Director
Division of Water Resources,NCDEQ
hc: Central Files
ec: Laserfiche
DWR/WSRO,Ron Boone[ron.boonegancdenr.gov]
Kristen M.Jarrett[Kristen [e-mail]]

Date:9/13/2019
FACILITY:Kaba Access Controls(GW-REM Site) Outfall 001
NPDES PERMIT:NC0089508 Dissolved to Total Metal Calculator
In accordance with Federal Regulations,permit limitations must be written as Total Metals per 40 CFR 122.45(c)
Receiving Receiving Rec.Stream i NPDES Total Suspended Combined Combined Instream Instream Effluent
Stream Stream Solids Hardness Hardness Wastewater Wastewater Upstream Hardness
1 Q10 Flow Limit Hardness
summer summer7Q10 -Fixed Value- chronic Acute Concentration Concentration g ( �) Average
7Q10(CFS) (MGD) MGD MGD (mg/L) (mg/L) (mg/L) (Chronic) (Acute) Avers e m (mg/L)
0.0000 0.0.0.00 0.0000 0.0432 10 25.000 I 25.000 II 100.0000 I 100.0000 25 25
Upstream Hard Avg(mg/L)= 25
EFF Hard Avg(mg/L)= 25
US EPA Maximum Aflowable Effluent Concentration COMMENTS(identify parameters to PERCS Branch to maintain in facility's LTMP/STMP):
Dissolved Metals Translators-using (MAEC)as a Total Metal
PARAMETER Default Partition =DissolvedMetal-Translator
Chronic Acute Coefficients Chronic Acute
[ug/I] (ug/1] (streams) jug/I] lug/l
Cadmium(d) 0.15 0.82 0.252 0.59 3.24
Cd-Trout streams 0.15 0.51 0.252 0.59 2.01
Chromium III(d)(h) 24 183 0.202 117.73 905.08
Chromium VI(d) 11 16 1.000 11.00 16.00
Chromium,Total(t) N/A N/A
Copper(d)(h) 2.7 3.6 0.348 7.88 10.47
Lead(d)(h) 0.54 14 0.184 2.94 75.49
Nickel(d)(h) 16 145 0.432 37.23 335.21
NI-WS streams(t) 25 N/A
Silver(d)(h,acute) 0.06 0.30 1.000 0.06 0.30
Zinc(d)(h) 36 36 0.288 126.73 125.71
Beryllium 6.5 65 1.000 6.5 65
Arsenic(d) 150 340 1.000 150 340
(d)=dissolved metal standard.See 15A NCAC 026.0211 for more information.
(h)=hardness-dependent dissolved metal standard.See 15A NCAC 02B.0211 for more information.
(t)=based upon measurement of total recoveable metal.See 15A NCAC 026.0211 for more information.
The Human Health standard for Nickel in Water Supply Streams is 25 mg/L which is Total Recoverable metal standard.
The Human Health standard for Arsenic is 10 µg/L which is Total Recoverable metal standard.