NCG120038_DMR_June_20200708

DocuSign Envelope ID: 6899D4A7-2F29-4B1E-A462-CD1D30630055
SMITHAARDNER
ENGINEERS --
July 8, 2020
ADDRESS TEL WEB
14 N. Boylan Avenue, Raleigh NC 27603 919.828.0577 www.smithgardnerinc.com
NCDEQ
Division of Water Quality
Attention: DWQ Central Files 1617 Mail Service Center KC�•tI V E D
Raleigh, NC 27699-1617 JUL 2 0 2020
RE: Discharge Monitoring Report —June 2020 CENTRAL FILES
Davidson County Landfill DWR SECTION
Certificate of Coverage#NCG120038
Dear Sir/Madam:
On behalf of Davidson County, Smith Gardner, Inc. (S+G) is pleased to submit the attached
Discharge Monitoring Report (DMR) and associated analytical report for stormwater
monitoring at the Davidson County Landfill. The facility is permitted to discharge stormwater
related to landfilling activities under Certificate of Coverage (COC) Number NCG120038,
General Permit Number NCG120000. The facility is required to monitor discharge at four (4)
Stormwater Discharge Outfalls: C&D pond, C&D new pond, Phase 2 Pond 3, and Phase 2
Pond 4.
All representative outfalls exceeded the benchmark threshold for fecal coliform, and Phase 2
Pond 3 and Phase 2 Pond 4 exceeded the threshold for total suspended solids (TSS). In April
2013, S+G submitted a permit modification that indicated animals were an alternate source
for fecal coliform exceedance.
Closure of the C&D landfill was completed in 2018. Davidson County and S+G plan to submit
a permit modification application to reduce or remove monitoring for this facility.
We are providing two (2) copies of the June DMR report for this submittal. If you have any
questions, or require further information, please contact us via phone at [phone] or by
email.
Sincerely,
SMITH GARDNER, INC.
E DoeuSigned by:
C. U
CSECC95C937E4AC..
Jesse C. Li, E. I.
Staff Engineer, ext. 170
0essefdsmithgardnerinc.com
DocuSigned by:
SB6831996A674D7_.
Pieter K. Scheer, P.E.
Senior Engineer, ext. 123
pieter0smithgardnerinc.com
Attachments
CC: Steven Sink (Davidson County)
Joan Smyth, P.G. (S+G)
File
I-I.AProjeos\Nvidsnn County INM2 01' ComplianceA03 DC NPC![5\25, line 2020A[IWQnpdes_DavCo_Jun2020 ,Jocx

Semi-annual Stormwater Discharge Monitoring Report
for North Carolina Division of Energy, Mineral and Land Resources General Permit No. NCG120000
Date submitted July 8, 2020
CERTIFICATE OF COVERAGE NO. NCG12 0 0 3 8
FACILITY NAME Davidson County Landfill
COUNTY Davidson
PERSON COLLECTING SAMPLES Steven Sink (Davidson County)
LABORATORY Research and Analytical laboratory Lab Cert. # 34
Comments on sample collection or analysis:
Part A: Stormwater Benchmarks and Monitoring Results
SAMPLE COLLECTION YEAR 2020
SAMPLE PERIOD ❑ Jan -June ❑ July -Dec
or ❑■ Monthly' June (month)
DISCHARGING TO CLASS ❑ORW ❑HQW ❑Trout ❑PNA
❑Zero -flow ❑Water Supply [:]SA
Mother c
PLEASE REMEMBER TO SIGN ON THE REVERSE -i
n No discharge this periodz
Outfall No.
Date Sample
Collected'
(mo/dd/yr)
24-hour rainfall
amount,
Inches3
Chemical Oxygen
Demand
mg/L
Fecal Coliform
Colonies per 100 ml.
Total Suspended
Solids
mg/L
pH,
Standard Units
Benchmarks
-
-
120
1000
100 or 504
6.0-9.0
Parameter Code
-
46529
00340
31616
C0530
00400
C&D Pond
6/16/20
1.0
15
>12000
86.7
C&D New Pond
6/16/20
1.0
<5
>12000
74.1
Ph. 2 Pond 3
6/16/20
1.0
<5
>12000
2020
Ph. 2 Pond 4
6/16/20
1.0
<5
4600
1220
' Monthly sampling (instead of semi-annual) must begin with the second consecutive benchmark exceedance for the same parameter at the same outraii.
'For sampling periods with no discharge at any single outfall, you must still submit this discharge monitoring report with a checkmark here.
'The total precipitation must be recorded using data from an on -site rain gauge. Unattended sites maybe eligible for a waiver of the rain gauge requirement.
" See General Permit text, Table 1, identifying the especially sensitive receiving water classifications where the more protective benchmark applies.
Note: Results must be reported in numerical format. For example, do not report Below Detection Limit, BDL, <PQL, Non -detect, ND, or other similar non -
numerical format. When results are below the applicable limits, they must be reported in the format, "<XX ma/L where XX is the numerical value of the
detection limit, reporting limit, etc. in mg/L. Conversely, where fecal coliform results exceed the dilution upper limit, report the result as ">XX".
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
Permit Date: 11/1/2018-5/31/2021 SWU-248, last revised 11/1/2018
Page 1 of 2

Part B: Vehicle Maintenance Area Monitoring Results: only for facilities averaging > 55 gal of new oil per month.
F-1 No discharge this period'
Outfall No.
Date Sample Collected'
(mo/dd/yr)
24-hour rainfall amount,
Inches;
Non -Polar Oil & Grease
mg/L
Total Suspended Solids,
mg/L
New Motor or Hydraullc Oil Usage,
gal/mon
Benchmarks
-
-
15
100 or SW
—
Parameter Code
-
46529
00552
C0530
NCOIL
Footnotes from Part A also apply to this Part B
Note: If you report a sample value in excess of the benchmark, you must implement Tier 1, Tier 2, or Tier 3 responses. See General Permit text.
FOR PART A AND PART B MONITORING RESULTS:
• A BENCHMARK EXCEEDANCE TRIGGERS TIER 1 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• 2 EXCEEDANCES IN A ROW FOR THE SAME PARAMETER AT THE SAME OUTFALL TRIGGER TIER 2 REQUIREMENTS. SEE PERMIT PART II SECTION B.
• TIER 3: HAS YOUR FACILITY HAD 4 OR MORE BENCHMARK EXCEEDENCES FOR THE SAME PARAMETER AT ANY ONE OUTFALL? YES El NO ❑
IF YES, HAVE YOU CONTACTED THE DEMLR REGIONAL OFFICE? YES E] NO ❑
REGIONAL OFFICE CONTACT NAME: Jennifer Carter
Mail an orlainal copy of this DMR including all "No Discharge" reports within 30 days of receipt of the lab results for at end of monitoring period in the
case of "No Discharge" reports) to:
Division of Water Quality
Attn: DWQ Central Files
1617 Mail Service Center
Raleigh, North Carolina 27699-1617
YOU MUST SIGN THIS CERTIFICATION_ FOR ANY INFORMATION REPORTED:
"I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to
assure that alified personnel properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system, or
those rson directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I
am awhat here are significant penalties for submitting false information, including the possibility of fines and imprisonment for knowing violations."
Signature of Permittee
Permit Date:11/1/2018-5/31/2021
-e' a O
Date
SWU-248, last revised 11/1/2018
Page 2 of 2