NCG120115_2022 DMR_20220412

MUNICIPAL ENGINEERING, mr.,
60 Sm1u Affw GRI++C, C3ARNCA, NC 275Z9 - P-oNc: S 14•' 72.5393
P.Q. 94x 3491 EGOmf, NC 286G7 - PK4w£` 928-25Z-1 767
LR ENE E N UMBERS; VIC 9 12 do C-5 Bea
Ms. Tamera Eplin April 8, 2022
Regional Engineer, NCDMER
tamera.MlinLt�Lcdenr. Rov
450 West Hanes Mill Rd. Ste 300
Winston Salem, NC 27105
Re: Stormwater Permit Exceedance Notification and Tier One Documentation (FC at SDO-2, SDO-3)
Coble's Sandrock C&D Landfill
Permit No. NCG120115
Permit Period Benchmark Exceeded: 2022 Period 1
Dear Ms. Eplin:
The analytical results of stormwater samples collected at the Coble's Sandrock Construction & Demolition (C&D) Landfill on March
17, 2022 contained levels of fecal coliform (FC) in samples SDO-2 and SDO-3 at 1,360 and 2,100 colonies per 100ME respectively.
These FC concentrations were above the benchmark outlined in NCG120000 (1,000 colonies per 100 ml) (DMR form tiled
separately). In response to these exceedances a Tier 1 response was initiated. This Tier 1 response documents findings of a site
inspection and fulfills the requirement to notify the NCDEMER Winston Salem Regional office of the exceedances and serves as the
record keeping component of the Tier One requirement.
Preliminary laboratory results were reviewed on March 25, 2022 and reported on March 30, 2022 and a Tier One response was
initiated within two weeks in fulfillment of the permit requirements. Mr. Ben Clawson, PE a representative of Municipal
Engineering, Inc. (MESCO) performed a comprehensive stormwater management field inspection of drainage areas leading to SDO-2
and SDO-3 on March 25, 2022. During the inspection, possible causes of the exceedances were evaluated. The suspected source of
FC is believed to originate from animal excrement and not industrial activities. Eradication of indigenous animals and birds would be
the most effective corrective action which is not feasible, practical or lawful in most circumstances.
At the time of sampling SDO-2 and SDO-3 received stormwater originating from drainage areas along the east and west side of a
C&D Landfill that had ceased waste deposition months prior. The majority of the portion of the landfill within SDO-2 and SDO-3
drainage area is closed with a cohesive and vegetated cap and a small portion along the ridge top contained an intermediate soil cover.
The portion of the landfill located along the ridge top is planned to be capped and vegetated in the near future. During the inspection
SDO-2 and SDO-3 drainage areas were identified to only contain "non -contaminated stormwater". The term "non -contaminated
stormwater" is defined in 40 CFR 445.2 as"stormwater which does not come in direct contact with landfilled waste, the waste
handling and treatment areas, or landfill wastewater." Non -contaminated stormwater includes stormwater which"flows off the cap,
cover, intermediate cover, daily cover, and/or final cover of the landfill." (Reference:40 CFR 445.2.)6 No waste was exposed, no
erosion features or other nonconformities in the cover, Vegetation is established over the majority of the area and no signs of past
leachate breakouts leading towards either outtall were noticed. The current working face is Phase 3B which is south and generally
outside the SDO-2 and SDO-3 drainage areas. Active Phase 3B is located in the drainage area monitored by SDO-1 and all tested
parameters were below compliance benchmarks. Stormwater flows from SDO-1 through erosion control devices and mixes with
stormwater from SDO-3 drainage area before entering PopPaw Creek which segment serves as the property line. A map showing the
drainage areas is shown on Figure 1. In summary, the landfill cover, condition, maintenance, and erosion controls are considered
acceptable therefore the source of FC as found in sample SDO-2 and SDO-3 is very likely not attributed to industrial activities.
Elevated FC levels as identified in this and previous stormwater samples is very likely product of animal excrement. Evidence of
several species of wildlife such as deer, birds and varmint are consistently observed within the drainage areas.
MESCO staff discussed potential courses of action to reduce FC levels on March 30, 2022. Since evidence suggests that the source of
FC is not industrial activities corrective actions are largely unwarranted at this time.
Coble's Sandrock, Inc., remains committed to safe -guarding the environment and will continuously evaluate storm -water conditions
and respond accordingly. Please contact Ms. Kent Coble (permit owner) or Jonathan Pfohl (consultant) with any questions or
comments.
Sincerely,
MUNICIPAL ENGINEERING SERVICES CO., P.A.
Jonathan Pfohl
[phone]
jpfohlgmesco.com
cc: Kent Coble and Deanna Martin-Coble's Sandrock, Inc., Benjamin Clawson, PE MESCO
,US. Environmental Protection Agency. "Final Reissuance of National Pollutant Discharge Elimination System (NPDES) Storm Water Multi -Sector General Permit for Industrial Adivities."
68 Shipwash Drive • Garner, NC 27529 • ph: 919-772-5393 • fx: 919-772-1176 • www.mesco.com
LICENSE NUMBER: F-0812

PROPERTY WEST OF LINE y S��-PHASE
NOW OWNED BY COBLE'S
2A
_ MW-5 l -`
- MW-7RIF
— MINE :I —ter
` FACILITY
BOUNDARY
(1,54 20 ACR
MW 8
�Nf
. . ............... 7
LEGEND-
STORMWATER BASIN
CREEK/STREAM
MONITORING WELL
sw
SURFACE WATER POINT
OBSERVATION WELL
STORMWATER DITCH
STORMWATER DRAINAGE AREA
VEHICLE MAINTENANCE ACTIVITIES
0 400 800
Feet
FIGURE,
L
■
Q
M
M
Z
■
�
N
�
�0
VI
�
01
N
t0
W
�
N
W
W
ZU
N
ZIL
Z
Q
0w^
o
co
fn
a
rna°
=
El
1�1
Z
�
N
'�
i
0
U
w
W
0
N
U
t0
00
co
1
Ll
Z
N
L3
ZI
Z
J
w
W
Z
ZW
Ill
Z
Q
U]
.<ZW
a
�°J
W
°
r,
�
W
W
00
Ll
Z>
m
a
X
°
a
00
W
=0
Ln
rn
kD
DL
z
O Q
O O
z J O
W — (z Q
oa z =
Z
Y) O
rz CCUJ
z
C� 0 J
Z m >.
oc Q O �—
I- J V OC
W
z o0
O �
m
0
SCALE: SEE BAR SCALE
DATE: 8130121
DRWN. BY. E. LAMBERT
CHKD. BY. J. ZIMMERMAN
PROJECT NUMBER
G21036.0
DRAWING NO. SHEET NO.

NCDEQ Division of Energy, Mineral and Land Resources
Stormwater Discharge Monitoring Report (DMR) Form for NCG120000
Landfills
Click here for instructions
Complete, sign, scan and submit the DMR via the Stormwater NPDES Permit Data Monitoring Report (DMR) Upload form within
30 days of receiving sampling results. Mail the original, signed hard copy of the DMR to the appropriate DEMLR Regional Office.
Certificate of Coverage No. NCG12 OQ
Facility Name: Coble's Sandrock C&D Landfill
Person Collecting Samples: Deanna Martin
Laboratory Name: Pace Analytical Services, LLC
Facility County: Alamance I Laboratory Cert. No.: 40
Discharge during this period: g Yes ❑ No (if no, skip to signature and date)
Has your facility implemented mandatory Tier response actions for any benchmark exceedances? ❑ Yes ❑■ No
If so, which Tier (1, 11, or III)? 1
Part A: Analytical Monitoring Requirements for Outfalls with Industrial Activities— Benchmarks in (Red)
Parameter
Parameter
Outfall 1
Outfall 2
Outfall 3
Outfall
Outfall
Code
N/A
Receiving Stream Class
WS-V; NSW
WS-V; NSW
WS-V; NSW
N/A
Date Sample Collected MM/DD/YYYY
03/17/2022
03/17/2022
03/17/2022
46529
24-Hour Rainfall in inches
2.14
2.14
2.14
C0530
TSS in mg/L (100 or 50*)
17.4
54.8
54.4
00400
pH in standard units (6.0-9.0)
31616
Fecal Coliform per 100 ml of
126
1,360
2,100
freshwater (1000)
r00340
Chemical Oxygen Demand in mg/L
43.4
59.5
59.5
(120)
Part B: Vehicle & Equipment Maintenance Areas — Benchmarks in (Red)
Parameter
Parameter
Outfall
Outfa I I
Outfall
Outfall
O utfa I I
Code
N/A
Receiving Stream Class
N/A
Date Sample Collected MM/DD/YYYY
00552
Non -Polar Oil & Grease in mg/L (15)
New Motor/Hydraulic Oil Usage in
NCOIL
gal/month
* Outfalls to Outstanding Resource Waters (ORW), High Quality Waters (HOW), Trout Waters (Tr) and Primary Nursery Areas (PNA)
have a benchmark TSS limit of 50 mg/L. All other water classifications have a benchmark of 100 mg/L.
Notes (optional): Source of fecal coliform not attributed to landfill activities. Tier one response implemented and Ms. Eplin (NCDMLR) notified.
"I certify by my signature below, 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 qualified personnel properly gather and evaluate the information
submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for
gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete. I am
aware that there are significant penalties for submitting false information, including the possibility of fines and imprisonment for
knowing violations."
T )A-41. 6
Signature of Permittee or Delegated Authorized Individual
4/12/22
Date