NCG120038_Tier III_20230227

DocuSign Envelope ID:982B3615-64E1-4543-9973-F60CCCA4D80C
SMITH ONE
February 23, 2023
N C Department of
Environmental Quality
Lily Kay Received
Environmental Program Consultant FEB 2 7 2023
NCDEMLR - Winston-Salem Regional Office
450 West Hanes Mill Road, Suite 300 Winston-S.)lem
Winston-Salem, NC 27105 f;�-' ional Office
RE: February 2023 Exceedance Reporting and Tier Notification
Davidson County Landfill
Certificate of Coverage#NCG129038
General Permit#NCG120000
Dear Lily:
Smith Gardner, Inc. (S+G) has prepared this Exceedance Reporting and Tier Notification on
behalf of Davidson County following the February 2023 stormwater monitoring event at the
Davidson County Landfill (Landfill). The Landfill is currently permitted to discharge water
from landfill related activities under Certificate of Coverage Number NCG120038, General
Permit Number NCG120000 (Permit) issued July 1, 2021.
Currently, the facility is required to monitor discharge at six (6) Stormwater Discharge
Outfall (SDO) locations summarized in Table 1, below. As you are aware, the Request for
Representative Outfall Status was granted to the Landfill by the North Carolina Department
of Environmental Quality (NCDEQ), Division of Energy, Minerals and Land Resources
(DEMLR).
As required the Permit, notification of the date and value of each parameter exceedance and
change in tier status shall be submitted to NCDEQ-DEMLR within two weeks of receiving
sampling results. Sampling was conducted on February 2, 2023, the results of which were
received February 12, 2023. Based on the results of this sampling event, the following
outfaUs measured exceEdances for the following parameters (full analytical lab report is
attached):
• Phase 2 Pond 2
o Fecal = 7,300 CFU/100mL
• Phase 2 Pond 3:
o Fecal = 1,060 CFU/100mL
• Phase 2 Pond 4
o Fecal= 7,550 CFU/100mL
o TSS = 105 mg/L
• Phase 2 Pond 5
o Fecal = 35,000 CFU/100 mL
o TSS = 624 mg/L

Docu&gn Envelope ID:982B3615-64E1-4543-9973-F60CCCA4D80C
Ms. Lilly Kay
February 23, 2023
Page 2 of 2
As a result, tiered response actions are required for Phase 2, Ponds 2, 3, 4, and 5. Following
the February 2, 2023 sampling event, the tier status of each outfall at the Davidson County
Landfill is summarized in Table 1.
Table 1: SDO Locations and Tier Status
Outfall Required Sampling COD Fecal Coliform TSS
ID Frequency' (mg/L) (cfu/100 mL) (mg/L)
Ph-2 Pond-2 Monthly N/A Tier 2 Tier 2
Ph-2 Pond-3 Monthly N/A Tier 3 Tier 3
Ph-2 Pond-4 Monthly Tier 1 Tier 3 Tier 3
Ph-2 Pond-5 Monthly N/A Tier 2 Tier 3
Ph-2 Pond-6 Quarterly N/A N/A N/A
Notes:
1. Sampling frequency noted is representative of future sampling requirements following the results of the
current monitoring period.
All tiered response actions required for Phase 2, Ponds 2, 3, 4, and 5 will be conducted within
the required timeframe, records of which will maintained in the landfill's Stormwater
Pollution and Prevention Plan (SWPPP). A written corrective action plan for the Phase 2
Ponds 3, 4, and 5 Tier 3 response actions will be submitted under separate cover. If you have
any questions, or require further information, please contact me at [phone] or by
email.
Sincerely,
SMITH GARDNER,INC.
DocuSigned by: DocuSigned by:
C4990Ao59B9B4AD 5Bo831996A674D7
Matthew M. Jones, E.I. Pieter K. Scheer, P.E.
Staff Engineer, ext. 153 Senior Engineer, ext. 123
mac(dsmithgardnerinc.com pieter(dsmithgardnerinc.com
Attachment
CC: Steven Sink, Davidson County
Joan A. Smyth, P.G., S+G
File
H:\Projects\Davidson County(NCI\02 DC Compliance\03 DC NPDES\2023\02 -February\Tier& Exceedance Notification\DavdCo
February 2023 Exceedance Reporting and Tier Notification.docx

DocuSign Envelope ID:982B3615-64E1-4543-9973-F60CCCA4D80C Pace Analytical Services,LLC
p� 1377 South Park Drive
aceAnalytical Kernersville,NC 27284
www.pacelabs.com [phone]
Page 1 of 1
Laboratory Report
Steven Sink Report Date: 02/12/2023
Davidson County Landfill Date Received: 02/02/2023 -
1242 W H WY 29
Thomasville, NC 27360
Project: Davidson County Landfill
Pace Project No.:92649986
Sample: Phase 2 Pond 2 Lab ID: 92649986001 Collected: 02/02/23 08:45 Matrix: Water
Method Parameters Results Units Report Limit Analyzed Qualifiers
SM 2540D-2015 Total Suspended Solids 90.8 mg/L 10.4 02/03/23 09:27
SM 9222D-2015 Fecal Coliforms 7300 CFU/100 mL 1.0 02/03/23 14:53
SM 5220D-2011 Chemical Oxygen Demand 40.6 mg/L 25.0 02/11/23 05:18
Sample: Phase 2 Pond 3 Lab ID: 92649986002 Collected: 02/02/23 09:18 Matrix: Water
Method Parameters Results Units Report Limit Analyzed Qualifiers
SM 2540D-2015 Total Suspended Solids 74.2 mg/L 9.1 02/03/23 09:27
SM 9222D-2015 Fecal Coliforms 1060 CFU/100 mL 1.0 02/03/23 14:53
SM 5220D-2011 Chemical Oxygen Demand 66.2 mg/L 25.0 02/11/23 05:18
Sample: Phase 2 Pond 4 Lab ID: 92649986003 Collected: 02/02/23 08:55 Matrix: Water
Method Parameters Results Units Report Limit Analyzed Qualifiers
SM 2540D-2015 Total Suspended Solids 105 mg/L 16.7 02/03/23 09:25
SM 9222D-2015 Fecal Coliforms 7550 CFU/100 mL 1.0 02/03/23 14:53
SM 5220D-2011 Chemical Oxygen Demand 28.9 mg/L 25.0 02/11/23 05:18
Sample: Phase 2 Pond 5 Lab ID: 92649986004 Collected: 02/02/23 09:05 Matrix: Water
Method Parameters Results Units Report Limit Analyzed Qualifiers
SM 2540D-2015 Total Suspended Solids 624 mg/L 35.7 02/03/23 09:27
SM 9222D-2015 Fecal Coliforms 35000 CFU/100 mL 1.0 02/03/23 14:53
SM 5220D-2011 Chemical Oxygen Demand 54.6 mg/L 25.0 02/11/23 05:19
zYI Reviewed by: Cz
Stephanie Knott
704-977-0981
[e-mail]
Pace Analytical Services Asheville
2225 Riverside Drive,Asheville,NC 28804 South Carolina Laboratory ID:99030
Florida/NELAP Certification#: E87648 South Carolina Certification#:99030001
North Carolina Drinking Water Certification#:37712 Virginia/VELAP Certification#:460222
North Carolina Wastewater Certification#:40
Pace Analytical Services Eden
205 East Meadow Road Suite A, Eden, NC 27288 North Carolina Wastewater Certification#:633
North Carolina Drinking Water Certification#:37738 Virginia/VELAP Certification#:460025
Page 1 of 3

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