4204_HalifaxCoalAshLF_Aug2016_2ndSemiAnnual_DIN27049_20161116

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August 2016 Semi-Annual Groundwater Monitoring Report

Halifax County Coal Ash Landfill
NC Solid Waste Permit #42-04

Prepared for:

Halifax County Solid Waste Department
P.O. Box 70
Halifax, North Carolina 27839

November 2016

Prepared by:

© 2016 Smith Gardner, Inc.
This document is intended for the sole use of the client for which it was prepared and
for the purpose agreed on by the client and Smith Gardner, Inc.

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Halifax County Coal Ash Landfill August 2016 Semi-Annual Groundwater Monitoring Report
November 2016 Table of Contents Page i
Halifax County Coal Ash Landfill
NC Solid Waste Permit #42-04

August 2016 Semi-Annual Groundwater Monitoring Report

Table of Contents
Page

1.0 INTRODUCTION ......................................................................................................... 1 
2.0 SITE HYDROGEOLOGY ................................................................................................ 1 
3.0 SAMPLING LOCATIONS AND PROCEDURES .............................................................. 1 
4.0 FIELD AND LABORATORY RESULTS .......................................................................... 2 
4.1 Field Results .............................................................................................................. 2 
4.2 Laboratory Analysis ................................................................................................... 2 
4.3 Laboratory Results .................................................................................................... 2 
5.0 GROUNDWATER CHARACTERIZATION ...................................................................... 3 
6.0 CONCLUSIONS .......................................................................................................... 3 

FIGURES
Figure 1 Groundwater Potentiometric Map

TABLES
Table 1 Groundwater Elevations & Velocities
Table 2 Field Parameters
Table 3 Inorganic Constituents - Groundwater Samples
Table 4 Inorganic Constituents – Sediment Samples
Table 5 Calculated Groundwater Velocities

APPENDICES
Appendix A Laboratory Analytical Report

Halifax County Coal Ash Landfill August 2016 Semi-Annual Groundwater Monitoring Report
November 2016 Table of Contents Page ii

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Halifax County Coal Ash Landfill August 2016 Semi-Annual Groundwater Monitoring Report
November 2016 Page 1
1.0 INTRODUCTION
Smith Gardner, Inc. (S+G) is pleased to submit this semi-annual sampling report on behalf of
the Halifax County Lined Coal Ash Landfill, operating under Solid Waste Permit #42-04, in
accordance with Solid Waste Section Rule 15A NCAC 13B. This report presents semi-annual
monitoring results for the event performed August 10, 2016.

The Halifax County Lined Coal Ash Landfill is a monofill landfill that only accepts coal ash from
power generation. This report includes a field procedure summary, laboratory analyses,
summary tables and groundwater characterization.
2.0 SITE HYDROGEOLOGY
The 1985 North Carolina Geological Map and Groundwater in the Halifax Area, North Carolina
(Dept. of Conservation and Development Bulletin #51, 1946) indicates the Halifax County Lined
Coal Ash Landfill is situated on the eastern edge of the Eastern Piedmont Physiographic
Province, just west of the Coastal Plain overlap. Western Halifax County is underlain by an
assemblage of felsic to intermediate crystalline igneous and metamorphic rocks of early to late
Paleozoic age. Eastern piedmont rocks exhibit a northeast strike and locally dip gently
eastward as a result of regional metamorphism and folding that produced a broad plunging
anticline. The area was simultaneously intruded by a number of felsic (granite) plutons. The
rock formation underlying the subject site is a granitic pluton identified as the Butterwood
Creek intrusive.

Depths to groundwater generally range from near surface in lowland areas along Brewer’s
Creek and its tributary to around 45 ft. below grade in the MW-12 area. Groundwater generally
flows to the south.
3.0 SAMPLING LOCATIONS AND PROCEDURES
The sampling event, performed by Environment 1, Inc., on August 10, 2016 was conducted in
accordance with the approved site Water Quality Monitoring Plan1. Sampling methods followed
the protocol outlined in the Solid Waste Section Guidelines for Groundwater, Soil and Surface
Water Sampling2. The depth to water in each well was gauged prior to purging and sampling.

The monitoring network at the Halifax Coal Ash Landfill currently includes six groundwater
wells (MW-8, MW-9, MW-10, MW-11, MW-12 and MW-17), a surface water location (SW-33) one
sample collected from Sediment Basin 1 (Basin 1) and two sediment samples collected
upstream and downstream of the sedimentation basin discharge point (Sediment 1 and
Sediment 2). Sampling location details are presented in Table 1. Sampling locations are shown
on Figure 1.

1 Halifax County Landfill, Water Quality Monitoring Plan, November 2012 by Smith Gardner, Inc.
2 Solid Waste Section Guidelines for Groundwater, Soil and surface Water Sampling, NCDENR, DWM, April 2008.
3 The SW-3 location has been erroneously referred to as SW-1 in past semi-annual groundwater reports.

Halifax County Coal Ash Landfill August 2016 Semi-Annual Groundwater Monitoring Report
November 2016 Page 2
4.0 FIELD AND LABORATORY RESULTS
Samples were collected by Environment 1, Inc. personnel in laboratory prepared containers for
the specified analytical procedures. Groundwater samples were properly preserved, placed on
ice and transported to the laboratory facility within the specified hold times for each analysis.
4.1 Field Results
Temperature, pH, turbidity and specific conductance were measured in the field prior to
sampling via direct read instruments. The field parameter results are summarized in
Table 2 and have remained generally consistent with previously reported sampling
events.
4.2 Laboratory Analysis
The samples were transported under proper chain of custody, in a cooler with ice to
Environment 1, Inc., a North Carolina certified laboratory (NC Wastewater ID #10)
located in Greenville, NC. Ground and surface water samples were analyzed for
Appendix I metals plus mercury, total organic carbon (TOC), chloride and sulfate via the
test methods specified in the laboratory report. Sediment samples were analyzed by
SGS Accutest (NC Certification ID #573) located in Orlando, FL. Samples were analyzed
for specific metals detailed in the laboratory report using approved TCLP methods.
Parameters were reported at NC Solid Waste Section Practical Quantitation Limits
(SWSLs).

The laboratory analytical report is included as Appendix A.
4.3 Laboratory Results
Analytical results were compared to the NC DWM Solid Waste Section Quantitation
Limits (SWSLs), 15A NCAC 2L.0200 (2LStandard) and the EPA Federal Maximum
Contaminant Limit. Surface water and basin results were compared with the NCAC 2B
Standard for Class C waters (2B Standards).
No inorganic (metal) constituents were detected in monitoring wells at concentrations
above their 2L Standards this event, which is consistent with historically reported
results. Most inorganic concentrations were reported as “J-qualified” indicating they
are a non-quantifiable value that falls between the method limit and the SWSL.
Detectable concentrations of the indicator parameter total organic carbon were reported
in the sample from MW-8; however, no SWSL, MCL or 2L Standard is established for this
parameter.

Arsenic was the only inorganic (metal) constituents detected in the sample from Basin 1
above the 2B Standard. No inorganic (metal) constituents were detected in the sample
from SW-3 above the 2B Standard. The indicator parameter chloride was reported in

Halifax County Coal Ash Landfill August 2016 Semi-Annual Groundwater Monitoring Report
November 2016 Page 3
SW-3 and Basin 1 at concentrations above the 2B Standard. We will continue to monitor
the concentrations of these constituents going forward.

There were no constituents detected in the sediment samples (upstream and
downstream).

Detected inorganic constituents from ground or surface water samples are presented in
Table 3. Sediment sample results are shown in Table 4.
5.0 GROUNDWATER CHARACTERIZATION
The depth to water data indicates that groundwater is flowing generally south towards the
unnamed tributary to Brewer’s Creek; which is consistent with historic groundwater flow
patterns. Average groundwater velocity for the site is 0.0121 ft/day. Calculated groundwater
velocities are presented in Table 5. The groundwater flow map is included as Figure 1.
6.0 CONCLUSIONS
Current and historic analytical data indicate no groundwater impact at this site. Elevated
concentrations of chloride in the basin and stream samples are consistent with historic results.
We will continue to monitor these concentrations in the future. The next semi-annual event is
scheduled for February 2017. An event report will be submitted to NCDEQ following receipt and
review of sampling results.

Halifax County Coal Ash Landfill August 2016 Semi-Annual Groundwater Monitoring Report
November 2016 Page 4

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FIGURES
August 2016 - Groundwater Monitoring Report
Halifax County Coal Ash Landfill
NC Solid Waste Permit #42-04

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MW-8TOC=308.43DTW=7.14GWE=301.29
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G:\CAD\Halifax\Halifax-8\sheets\HALI-B0305.dwg - 11/2/2016 2:50 PM
DRAWN:APPROVED:
PROJECT NO:
SCALE:
FILENAME:DATE:
FIGURE NO.PREPARED BY:PREPARED FOR:
SMITH
14 N. Boylan Avenue, Raleigh NC 27603
NC LIC. NO. C-0828 (ENGINEERING)
919.828.0577
GARDNER+
© 2016 Smith Gardner, Inc.
GROUNDWATER POTENTIOMETRIC MAP
HALIFAX COAL ASH LANDFILL
AUGUST 2016
C.T.J.M.M.G.AS SHOWN 1
Nov 2016 HALIFAX-8 HALI-B0305
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August 2016 - Groundwater Monitoring Report
Halifax County Coal Ash Landfill
NC Solid Waste Permit #42-04

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By: JM Date: 11/9/2016
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By: MG Date: 4/18/2016
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a
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d

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w
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a

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d

f
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d
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&

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l
l
s

(
D
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s
c
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l
)
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d
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a
u
l
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c

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r
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d
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n
t

b
a
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d

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n

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u
g
u
s
t

2
0
1
5

g
r
o
u
n
d
w
a
t
e
r

e
l
e
v
a
t
i
o
n
s
Ve
l
o
c
i
t
y

C
a
l
c
u
l
a
t
e
d

f
r
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m

V
=
K
*
i
/
n
V
=

v
e
l
o
c
i
t
y
K
=

H
y
d
r
a
u
l
i
c

C
o
n
d
u
c
t
i
v
i
t
y
i
=

G
r
a
d
i
e
n
t
n
=

P
o
r
o
s
i
t
y
Av
e
r
a
g
e

V
e
l
o
c
i
t
y

Th
i
s

p
a
g
e

i
n
t
e
n
t
i
o
n
a
l
l
y

l
e
f
t

b
l
a
n
k
.

Appendix A
Laboratory Analytical Report
Augsut 2016 - Groundwater Monitoring Report
Halifax County Coal Ash Landfill
NC Solid Waste Permit #42-04

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