1403_Caldwell_Foothills_MSWLF_NotificationGW_FID1774038_20230303

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C O N S U L T I N G
March 3, 2023
Ms. Jackie Drummond
Compliance Hydrogeologist
North Carolina Department of Environmental Quality
Division of Waste Management - Solid Waste Section
Asheville Regional Office (ARO)
2090 US Highway 70
Swannanoa, North Carolina 28778
Re: Notification of Appendix II Detections
Foothills Regional Landfill, Permit No. 14-03
Caldwell County, North Carolina
Dear Ms. Drummond:
Submitted via Electronic Mail
On behalf of the Foothills Regional Landfill, Jett Environmental Consulting is submitting notification of Appendix II
constituents detected in site groundwater monitoring wells during the First Semi -Annual 2023 sampling event. This
notification is in accordance with North Carolina Department of Environmental Quality (DEQ) Requirements for
Municipal Solid Waste Landfill Facilities Section .1634(d), which states the following:
"After obtaining the results from the initial or subsequent sampling events required in Paragraph (b) of this Rule,
the owner or operator shall: (1) Within 14 days, submit a report to the Division and place a notice in the operating
record identifying the Appendix lI constituents that have been detected,"
Groundwater sampling was completed by Environmental Sampling & Services, Inc. (ES&S) on February 6,
2023. Analytical testing was performed by Pace Analytical Services, LLC for the annual Appendix II sampling
event for well MW-2R. Results were received by Jett Environmental Consulting on February 28, 2023. The
attached Table 1 summarizes the Appendix II constituents that were confirmed detected above the laboratory
practical quantitation limits (PQLs) during the First Semi -Annual 2023 event. The Appendix II constituents
confirmed detected at quantified levels are also on the Appendix I Detection Monitoring list. The Appendix I
parameters detected (1,4-dichlorobenzene, barium, and benzene) are consistent with past events.
The attached Table 2 summarizes the Appendix I I constituents that were reported at estimated values between
the method detection limit (MDL) and the PQL. Any analyte detected at a concentration greater than the MDL
but less than the PQL is believed to be present, but the uncertainty in the value is high (i.e., laboratory
interferences). As a result, the actual concentration is estimated. No further action is required based on the
estimated results.
During the First Semi -Annual 2023 event, a low level detection of cyanide was reported at MW-2R (0.011 mg/L).
Cyanide has not previously been confirmed detected at the site. Review of the quality control (QC) data (matrix
spike and matrix spike duplicate results) in the laboratory analytical report revealed an "M1" flag, which denotes
the matric spike recovery results exceeded laboratory QC limits. Discussions with the laboratory indicated that
cyanide results near the laboratory reporting limit may have a high level of error. The laboratory re -analyzed
cyanide and the result was non -detect (<0.0080 mg/L). Both sets of results were provided in the laboratory
report. Therefore, the initial reported detection is considered suspect and not a confirmed detection. As a
conservative measure, the site will sample cyanide at MW-2R during the next regularly scheduled sampling
event to verify.
18 Lexington Oaks Court 314-496-4654
Foristell, MO 63348 www.jettenviro.com

The full groundwater report and statistical evaluation is currently being compiled and will be submitted per
Sections .1632 and .1633. The groundwater report will provide recommendations regarding Assessment and
Appendix II monitoring activities.
Should you have any questions or concerns, please contact Mr. Mike Loyd at [phone] or Steve Jett at
[phone].
Sincerely,
Steve Jett, LG #1825
Owner, Jett Environmental Consulting, PLLC (C-517)
Attachments: Table 1- Appendix II Detections Above the PQL
Table 2 — Appendix 11 Estimated Results Below the PQL
�,.
Ciara Childers Beavers
Project Geologist
cc: Mike Loyd, Republic Services, Inc. (PDF via electronic mail)

Table 1
Appendix II Detections Above the PQL
First Semi -Annual 2023 Sampling Event
Foothills Regional Landfill
Well
Constituent
Results
PQL
MDL
Units
1,4-Dichlorobenzene
1.1
1
0.33
u /L
MW-2R
Barium
335
100
0.67
u /L
Benzene
2.9
1
0.34
u /L
PQL: Laboratory Practical Quantitation Limit.
MDL: Laboratory Method Detection Limit.

Table 2
Appendix II Estimated Results Below the PQL
First Semi -Annual 2023 Sampling Event
Foothills Regional Landfill
Well
Constituent
Flag
Results
PQL
MDL
Units
1,1-Dichloroethane
J
0.67
5
0.37
u /L
Beryllium
J
0.16
1
0.054
ug/L
MW-2R
cis- 1,2-Dichloroethene
J
3.1
5
0.38
ug/L
Xylene (Total)
J
2.3
5
0.34
1 ug/L
PQL: Laboratory Practical Quantitation Limit.
MDL: Laboratory Method Detection Limit.
J: Denotes sample result above the MDL but below the PQL; estimated value;
value may not be accurate.