0105_Cobles_CDLF_Monitoring_FID1740657_20220808

ENR USE ONLY [:]Paper Report ❑Electronic Data - Email CD (data loaded: Yes / No Doc/Event #:
NC DENR Environmental Monitoring
Division of Waste Management - Solid Waste Reporting Form
Notice: This form and any information attached to it are "Public Records" as defined in NC General Statute 132-1. As such, these documents are
available for inspection and examination by any person upon request (NC General Statute 132-6).
Instructions:
Prepare one form for each individually monitored unit.
Please type or print legibly.
Attach a notification table with values that attain or exceed NC 2L groundwater standards or NC 2B surface water standards. The notification
must include a preliminary analysis of the cause and significance of each value. (e.g. naturally occurring, off -site source, pre-existing
condition, etc.).
Attach a notification table of any groundwater or surface water values that equal or exceed the reporting limits.
Attach a notification table of any methane gas values that attain or exceed explosive gas levels. This includes any structures on or nearby the
facility (NCAC 13B .1629 (4)(a)(i).
Send the original signed and sealed form, any tables, and .Electronic Data Deliverable to: Compliance Unit, NCDENR-DWM, Solid Waste
Section, 1646 Mail Service Center, Raleigh, NC 27699-1646.
Solid Waste Monitoring Data Submittal Information
Name of entity submitting data (laboratory, consultant, facility owner):
Municipal Engineering Inc.
Contact for questions about data formatting. Include data preparer's name, telephone number and E-mail address:
Name: Jonathan Pfohl
E-mail: [e-mail]
Phone: [phone]
NC Landfill Rule: Actual sampling dates (e.g.,
Facility name: Facility Address: Facility Permit # (.0500 or .1600) October 20-24, 2006)
Coble's Sandrock, Inc. 5833 Foster Store Road
C&D Debris Landfill Liberty, NC 27928 01-05 .0500 April 12-13, 2022
Environmental Status: (Check all that apply)
Initial/Background Monitoring ® Detection Monitoring ❑ Assessment Monitoring Corrective Action
of data submitted: (Check all that apply)
Groundwater monitoring data from monitoring wells
Groundwater monitoring data from private water supply wells
Leachate monitoring data ❑
Surface water monitoring data
Methane gas monitoring data
Corrective action data (specify)
Other(specify)
Notification attached?
No. No groundwater or surface water standards were exceeded.
>( Yes, a notification of values exceeding a groundwater o, surface water standard is attached. It includes a list of groundwater and surface water
monitoring points, dates, analytical values, NC 2L groundwater standard, NC 2B surface water standard or NC Solid Waste GWPS and
preliminary analysis of the cause and significance of any concentration.
Yes, a notification of values exceeding an explosive methane gas limit is attached. It includes the methane monitoring points, dates, sample
values and explosive methane gas limits -
Certification
To the best of my knowledge, the information reported and statements made on this data submittal -and -attachments are true and correct.
Furthermore, I have attached complete notification of any sampling values meeting or exceeding groundwater standards or -explosive gas
levels, and a preliminary analysis of the cause and significance of concentrations exceeding groundwater standards. I am aware that there
are significant penalties for making any false statement, representation, or certification including the possibility of a fine and- imprisonment.
S.J. Zimmerman, Project Manager [phone]
Name (Print) Title
of
Date
P.O. BOX 97, Garner, NC 27529
Facility Representative Address
NC PE Firm # F-0812 NC PG Firm # C-586
NC PE Firm License Number (if applicable effective May 1, 2009)
Revised 6/2009
(Area Code) Telephone Number.,
Affix NC LiSoi�/ Profe9 ssior(9(.;aeologist Seal
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Semi -Annual Water Quality Monitoring Report
April 2022
PJ°epared, for
Coble's Sandrock, Inc.
Construction & Demolition Landfill
Liberty, North Carolina
Permit No. 01-05
Prepared by
Municipal Engineering Inc.
P.O. BOX 97
Garner, North Carolina
MESCo Project Number: G22O36.O
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Jonathan Pfohl
Environmental Specialist
jpfohlki-nesco.com
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MUNICIPAL ENGINEERING9 INC.
68 SHIPWASH DRIVE, GARNER, NC 27529 - PHONE: [phone]
P.O. Box 349, BOONE, NC 28607 - PHONE: [phone]
LICENSE NUMBERS: F-O8 1 2 & C-586

Introduction
On behalf of Coble's Sandrock Inc., Municipal Engineering, Inc. (MESCO) is pleased to present this
Semi -Annual Water Quality Monitoring Report for an event performed at the Coble's Sandrock
Construction and Demolition debris Landfill (SWS Permit No.01-05) on April 12-13, 2022. The site is
located in Alamance County at 5833 Foster Store Road, Liberty, North Carolina.
North Carolina Department of Environmental Quality (NCDEQ) Solid Waste Rules at Title 15A, North
Carolina Administrative Code, Subchapter 13B .0600 (15A NCAC 1313), require that Coble's provide this
monitoring report to the Division of Waste Management's Solid Waste Section (SWS) on a semi-annual
basis. In general accordance with 15A NCAC 1313. 1632(i), the SWS Environmental Monitoring Report
Form and SWS memorandums, this report contains sampling procedures, field and laboratory results,
ground and surface water characterization. Tables concerning constituent detections, groundwater flow
rate and direction, field parameters, a potentiometric map, and the laboratory analytical reports with
quality assurance/quality control data and chains -of -custody (COC) are also included in this report.
Laboratory analytical results indicate that between one and four inorganic constituents were detected in
concentrations above their respective North Carolina Groundwater Standard in groundwater samples
collected from six wells. Most of these exceedances also exhibited a statistically significant increase over
background levels. The volatile organic compound, 1,4-dioxane, was also detected above regulatory
compliance Standards in samples collected from two wells. Total alkalinity was reported above surface
water Standards in samples collected upstream and downstream of the facility.
Background
The site currently operates as a less than 20-acre unlined C&D landfill situated on an approximate 154-
acre tract. The majority of Phases 1-3A have been capped with cohesive and vegetative cover. A two -
acre portion of Phase 3B began operations shortly prior to this event and the remaining 3.8-acre area is
under construction. Water quality detection monitoring has been performed at this facility on at least a
semi-annual basis, with historical data prior to 2010 reviewed in support of this report.
Sampling Locations
The water quality monitoring network includes ten locations; seven downgradient groundwater
monitoring wells (MW-2, MW-4, MW-7, MW-8, MW-10S, MW-11R, and P-19S), an upgradient
background monitoring well (MW-6) and two surface water points located upstream (SW-1) and
downstream (SW-2) of the facility. Quality control measures included analysis of an equipment blank
(EB). Samples were collected from all locations during this event.
Water monitoring locations are depicted on Figure 1. A summary detailing the construction of the water
monitoring wells is presented in Table 1.
Semi -Annual Water Quality Monitoring Report -April 2022
Coble's Sandrock C&D Landfill, Permit No. 01-05 Page 1

Sampling and Laboratory Procedures
Sampling was conducted utilizing portable methodology outlined in the NCDEQ SWS guidance
document Solid Waste Section Guidelines for Groundwater, Soil, and Surface Water Sampling revised
April 2008. The function and integrity of all monitoring locations were visually evaluated as documented
in Table 2. The depth to water in each well was electronically gaged prior to purging to quantify the
static water level elevation. Bailing was utilized to purge the wells a minimum of three times the volume
of standing water in the well or until dry. Stabilized field parameters were recorded during purging.
Samples were then placed into laboratory -prepared, pre -preserved containers. Samples were kept on ice
and transported to a NC -certified laboratory under proper chain of custody (COC) protocol within the
specified hold times for each analysis.
Field Parameter Data
Stabilized field parameters were recorded during purging which included pH, specific conductance,
temperature, dissolved oxygen, oxidation-reduction potential, hardness and turbidity. A summary of the
field parameter data is presented in Table 3 and field data sheets are in Appendix A. In general, field
parameters remain consistent with previous events. Turbidity levels remain elevated ranging from 60
NTU (MW-8) to 315 NTU (MW-7) which is well above the typical goal (10 NTU).
Laboratory Results
Pace Analytical Services LLC (PACE) (NC Cert. #12 & 40) and Environmental Conservation
Laboratories Inc. (ENCO) (NC Cert.# 424) performed the laboratory analysis. Water samples were tested
for constituents listed in 40 CFR 258 Appendix I, tetrahydrofuran, 1,4-dioxane, mercury, alkalinity,
chloride, iron, manganese, sulfate, total dissolved solids and turbidity. A sampling and analysis table
summarizing the locations, targeted constituents and methods is presented as Table 4. Laboratory results
and COC forms are presented in Appendix B.
Water samples were analyzed to the laboratory -established Method Detection Limits (MDL) and any
value between the MDL and laboratory -established Reporting Limit (RL) was qualified by the laboratory
with a "J", which indicates an estimated concentration. "J-qualified" concentrations are considered non -
quantifiable and discretion should be made prior to making decisions based on a value that the laboratory
considers an estimate. Table 5 summarizes constituents detected in groundwater samples compared to
current Interim Maximum Allowable Concentrations (IMAC), North Carolina Groundwater Quality
Standards (2L) and Background Threshold Value (BTV) levels established via an alternative source
demonstration (ASD), which are all recognized by the NC SWS as groundwater compliance Standards.
Groundwater samples were also compared to the Maximum Contaminant Level (MCL) commonly
referenced as the Federal "Drinking Water Standard", which are not applicable for regulatory compliance
purposes. Table 6 shows the constituents detected in surface water samples compared with the NC
Division of Water Resources "Surface Water Quality Standards, Criteria & In -Stream Target Values",
dated July 26, 2021.
Quality Control Samples
No constituents were detected in quantifiable concentrations in the equipment blank (EB). Therefore, the
dataset does not appear to be influenced by field and/or laboratory induced artifact contamination.
Semi -Annual Water Quality Monitoring Report -April 2022
Coble's Sandrock C&D Landfill, Permit No. 01-05 Page 2