0403_ChambersDevelopmentMSWLF_GWMR_26283_20160614

Groundwater
Statistical Analysis Report

First Semi-Annual 2016
Sampling Event

Anson Waste Management Facility
Chambers Development of NC, Inc.
Polkton, North Carolina

June 2016

Prepared by:

10 Quiet Brook Court 314-496-4654 St. Charles, MO 63303 www.jettenviro.com

TABLE OF CONTENTS

1.0 INTRODUCTION .............................................................................1 
2.0 SITE BACKGROUND AND MONITORING NETWORK ................1 
3.0 SITE HYDROGEOLOGY ................................................................2 
4.0 DATA EVALUATION ......................................................................2 
5.0 STATISTICAL PROCEDURES .......................................................3 
5.1 Outlier Analysis ...........................................................................3 
5.2 Intra-Well Prediction Intervals ....................................................3 
5.3 Statistical Results Summary .......................................................4 
6.0 CONCLUSIONS ..............................................................................4 

TABLES

Table 1 Groundwater Monitoring Program
Table 2 Groundwater Analytical Data Summary
Table 3 Surface Water Analytical Data Summary
Table 4 Enhanced Liner System & Leachate Analytical Data Summary

APPENDICES

Appendix A Potentiometric Surface Maps
Appendix B Statistical Evaluations
Appendix C Laboratory Analytical Reports & Field Sampling Forms
Groundwater Statistical Analysis Report
Anson Waste Management Facility, North Carolina 1

1.0 INTRODUCTION

On behalf of Chambers Development of North Carolina, Inc.-Anson Waste Management Facility, Jett
Environmental Consulting statistically evaluated the First Semi-Annual 2016 groundwater data. Sampling
was performed by S&ME and analytical testing was performed by Environmental Conservation
Laboratories, Inc. The statistical analysis software package utilized, SanitasTM, follows a documented
decision logic that incorporates the following applicable document: USEPA “Statistical Analysis of
Groundwater Monitoring Data at RCRA Facilities, Unified Guidance” (March 2009).
2.0 SITE BACKGROUND AND MONITORING NETWORK

Per the site’s Statistical Analysis Plan dated July 2001 by Herst & Associates, Inc. and in compliance with
North Carolina Department of Environment and Natural Resources (NCDENR) Solid Waste Management
Regulations, Section .1600 “Requirements for Municipal Solid Waste Landfill Facilities,” Jett Environmental
Consulting statistically evaluated parameters from the First Semi-Annual 2016 event using intra-well
prediction interval analysis. Prediction intervals are considered a powerful tool for groundwater statistical
analysis, when feasible, due to their inherent low false negative and false positive rates utilizing
confirmatory resampling, if necessary.

Background is defined as samples collected from each well from October 2000 through the previous event
(October 2015). The parameters subject to statistical evaluation during detection monitoring are noted in
NCDENR Section .1633 as constituents listed in Appendix I of 40 CFR Part 258 “Appendix I Constituents
for Detection Monitoring”. Table 1 lists the site’s groundwater monitoring wells.

Per September 28, 2012 NCDENR correspondence, approval was granted to sample the six Shallow zone
wells on a semi-annual basis, with the groundwater elevations monitored in Deep zone wells on a semi-
annual basis. The approval was under the condition that a groundwater sample be collected from a Deep
zone well if its accompanying Shallow zone well did not contain enough water to yield a sample. Each of
the Shallow zone wells was able to be sampled during the First Semi-Annual 2016 event.

Due to anomalous results for total metals at MW-2S during the Second Semi-Annual 2007 (October 2007)
and Second Semi-Annual 2009 (November 2009) events, data from these dates are not utilized in the
background data set for intra-well statistical analyses of MW-2S.

In addition to groundwater monitoring, the site has a surface water monitoring network consisting of the
following points:

Upstream
Pinch Gut Creek Upstream (BG-1)
Brown Creek Upstream (BG-2)

Downstream
Brown Creek Downstream (SG-3)
Pinch Gut Creek Downstream (SG-4)

The four surface water sampling points are sampled semi-annually for the 40 CFR Part 258 Appendix I list
in conjunction with the groundwater monitoring wells. During permitting of Phase 2, a fifth sampling station
(SG-5) was added at the outlet of an underdrain built below Phase 2B (beneath the north side of Phase 2A
and the south side of Phase 2B). SG-5 is sampled semi-annually (contingent on flow availability) for the
40 CFR Part 258 Appendix I list. Each of the surface water points was able to be sampled during the First
Semi-Annual 2016 event.

A leachate sample is also collected semi-annually for analysis in accordance with the facility’s permit. The
leachate sample is analyzed for the 40 CFR Part 258 Appendix I list, biochemical oxygen demand, chemical
Groundwater Statistical Analysis Report
Anson Waste Management Facility, North Carolina 2

oxygen demand, nitrate as N, pH, phosphorous, specific conductance, and sulfate. A leachate sample was
able to be sampled during the First Semi-Annual 2016 event.

According to the October 2008 plan prepared by David Garrett and Associates and titled “Water Quality
Monitoring Plan,” two Enhanced Liner System (ELS) sumps (#5 and #7) are to be sampled if liquids are
present. The ELS sumps are sampled semi-annually for the 40 CFR Part 258 Appendix I list. ELS sump
#5 and #7 were able to be sampled during the First Semi-Annual 2016 event.
3.0 SITE HYDROGEOLOGY

The following site hydrogeology summary was taken from a document titled Baseline Sampling Report,
Anson Waste Management Facility, dated June 2001 by Almes & Associates, Inc.

The site is located in the Piedmont Physiographic province within the Triassic-age Wadesboro basin. In
general, the lithology of the site is composed of saprolitic soils and partially weathered rocks grouped
together as “overburden” and competent bedrock. Three rock types comprise the bedrock at the site;
Triassic sediments of the Wadesboro basin (Chatham Group), bedded argillites of the Carolina Slate belt
(Floyd Church Formation), and diabase units in two north-west trending features (dikes). The three bedrock
types and overburden appear to have similar hydraulic characteristics and behave as equivalent to a porous
granular media at site scale. As a result, the direction of groundwater flow should be largely controlled by
site topography.

The groundwater monitoring system at the site has been designed to monitor groundwater within both the
overburden and the bedrock. Those monitoring wells designated with an “S”-suffix are screened within the
overburden to monitor the shallow groundwater and those wells designated with a “D”-suffix are deeper
wells screened within the bedrock. Based on data obtained during previous hydrogeologic investigations
at that site, it was determined that the geologic units were in communication, the groundwater flow pattern
appears to be controlled by topography, and the subsurface may be represented as a porous granular
media. The location and completed intervals for monitoring wells MW-1D and MW-6D were selected
specifically to collect background and downgradient water quality data, respectively, from the diabase dikes
at the site.

Appendix A provides potentiometric surface maps and groundwater flow calculations for the Shallow zone
and Deep zone utilizing groundwater level data from the First Semi-Annual 2016 event. Groundwater flow
direction for the First Semi-Annual 2016 event was to the northeast in both zones, consistent with past
events. Groundwater flow rate for the First Semi-Annual 2016 event was estimated to range from 77
feet/year in the Shallow zone to 36 feet/year in the Deep zone.
4.0 DATA EVALUATION

Appendix C contains a copy of the laboratory analytical reports and field log sheets for the First Semi-
Annual 2016 event for the groundwater, surface water, leachate, and ELS sump samples.

Groundwater

The analytical results for the First Semi-Annual 2016 event for the groundwater samples are summarized
on Table 2. No volatile organic compounds (VOCs) were detected at or above the NC Solid Waste Section
Reporting Limits (SWSLs) in groundwater samples. As shown on Table 2, several NC Appendix I inorganic
constituents were detected in samples from one or more wells at concentrations above their respective NC
Solid Waste Section Reporting Limits (SWSLs). Of the detections, only one Appendix I constituent (cobalt
at MW-3S) was detected above an SWSL and NC Solid Waste Section Groundwater Protection Standard
(NC GWPS) or NC 2L Groundwater Standard (NC 2L) during the First Semi-Annual 2016 sampling event.
Therefore, cobalt at MW-3S was statistically evaluated to determine if concentrations exhibit statistically
significant increases (see Section 5.2). The site groundwater detections are consistent with historical data.

Groundwater Statistical Analysis Report
Anson Waste Management Facility, North Carolina 3

Surface Water

The analytical results for the First Semi-Annual 2016 event for the surface water samples are summarized
on Table 3. During the First Semi-Annual 2016 event, no Appendix I VOCs were detected in surface water
samples at quantified concentrations above their respective NC SWSLs. No Appendix I inorganic
constituents were reported above an NC 2B Surface Water Standard during the First Semi-Annual 2016
event.

Leachate

During the First Semi-Annual 2016 event, a sample was collected from the leachate collection system. The
leachate sample results are summarized on Table 4.

Enhanced Liner System

According to the October 2008 plan prepared by David Garrett and Associates and titled “Water Quality
Monitoring Plan,” an evaluation is to be made semi-annually of the volume of free liquid removed from the
Enhanced Liner System (ELS) sump. The results of the evaluation and the VOC analysis of the ELS sump
liquids are to be included in the semi-annual groundwater report. The analytical results for the First Semi-
Annual 2016 event for the ELS sump samples are summarized on Table 4.

According to site personnel, liquids were present at ELS sumps #5 and #7 during the last six month
monitoring period. A sample was collected from ELS sumps #5 and #7 during the First Semi-Annual 2016
event (April 2016) and analyzed for the required VOCs. Liquids that are present in ELS sumps #5 and #7
are pumped to the leachate collection/disposal system and managed as leachate.

As shown on Table 4, VOCs were detected in the ELS sump samples. Total metals are also sampled at
the ELS sumps to supplement the VOC analyses (see Table 4). According to the site, from November
2015 through April 2016, the total volume of liquids measured in ELS sumps #5 and #7 was 5,319 gallons
and 90,167 gallons, respectively.
5.0 STATISTICAL PROCEDURES

Consistent with past events, the Appendix I constituent, cobalt, was detected above the SWSL and NC
GWPS/NC 2L standard during the First Semi-Annual 2016 sampling event. Statistical analyses (i.e. intra-
well prediction limits) were performed to establish background concentrations and determine if the NC
GWPS/NC 2L value-to-value exceedance exhibited a statistically significant increase in the Shallow zone.

5.1 Outlier Analysis

The background data were evaluated for the presence of statistical outliers. Methodologies for determining
a statistical outlier are defined in the EPA document, Statistical Analysis of Ground-Water Monitoring Data
at RCRA Facilities – Unified Guidance (March 2009). Any statistical outliers that were determined were
removed from the background data set prior to performing prediction interval statistical analysis. According
to the EPA guidance documents above, data that are not normally or log-normally distributed are not
recommended for evaluation of outliers. In cases where the data were not normally or log-normally
distributed, outliers were not removed from the data set.

Background outliers flagged for removal are identified on the statistical plots provided in Appendix B for
the Shallow zone.

5.2 Intra-Well Prediction Intervals

The prediction interval is a statistical method used to compare a single observation to a group of
observations. The prediction interval is calculated to include observations from the same population with a
Groundwater Statistical Analysis Report
Anson Waste Management Facility, North Carolina 4

specified confidence. In groundwater monitoring, a prediction interval approach may be used to make
comparisons between background and compliance data. The interval is developed to contain all future
observations, within a certain probability. For the Anson Waste Management site, intra-well prediction
intervals have been developed based on a 99% confidence that future observations will fall within the range.
If any future observation exceeds the prediction interval, this is considered statistically significant evidence
that the observation is not representative of the background group.

During parametric prediction interval analysis, the mean and the standard deviation are calculated for the
raw or transformed background data. The number of comparison observations, K, is defined to be included
in the interval. If less than 15% of the background observations are nondetects, the nondetects are replaced
with one half of the reporting limit prior to performing the analysis. If more than 15% but less than 50% of
the background data are below the reporting limit, the data’s sample mean and standard deviation are
adjusted according to the Kaplan-Meier method. However, when the background data are not transformed-
normal or contain greater than 50% observations below the reporting limit, SanitasTM automatically
constructs a non-parametric prediction interval. During non-parametric analysis, the highest value from the
background data is used to set the upper limit of the prediction interval.

For the First Semi-Annual 2016 event, one statistical exceedance was exhibited in the Shallow zone wells:
total cobalt at well MW-3S.

Prediction interval summary tables are presented in Appendix B for the Shallow zone. Included in
Appendix B are time series plots for each of the parameters statistically analyzed for this reporting period.

5.3 Statistical Results Summary

For the First Semi-Annual 2016 event, one statistical exceedance was exhibited in the Shallow zone wells:
total cobalt at downgradient well MW-3S. The April 2016 concentration of total cobalt at MW-3S (0.0125
mg/L) was above the intra-well prediction limit (0.0041 mg/L). The April 2016 total cobalt value at MW-3S
(0.0125 mg/L) was within the range of historical (non-outlier) total cobalt values at this well (0.00045 to
0.015 mg/L) and within the historical (non-outlier) range of values at upgradient well MW-2S (0.0011 to 0.11
mg/L). The total cobalt exceedance during the April 2016 event at MW-3S appears to be due to naturally
occurring conditions.

During the First Semi-Annual 2016 event, no volatile organic compounds (VOCs) were detected above the
North Carolina Solid Waste Section Limits (SWSLs) in groundwater samples.
6.0 CONCLUSIONS

For the First Semi-Annual 2016 groundwater monitoring event, only one concentration that was detected
above an NC SWSL and NC GWPS/NC 2L was also determined to statistically exceed the background
concentration: total cobalt at MW-3S. The April 2016 total cobalt value at MW-3S (0.0125 mg/L) was within
the range of historical total cobalt values at this well (0.00045 to 0.015 mg/L) and within the historical range
of values at upgradient well MW-2S (0.0011 to 0.11 mg/L). The low level detection of cobalt at MW-3S
does not appear attributable to the landfill, but rather consistent with naturally occurring cobalt in
groundwater at the facility. No further action is recommended at this time.

During the First Semi-Annual 2016 event, no VOCs were detected above the NC SWSLs in groundwater
samples.

During the First Semi-Annual 2016 event, no Appendix I VOCs were detected in surface water samples at
quantified concentrations above their respective NC SWSLs. No Appendix I inorganic constituents were
reported above an NC 2B Surface Water Standard during the First Semi-Annual 2016 event.

The site will continue monitoring in accordance with the requirements for Detection Monitoring as outlined
in Title 15A NCAC 13B .1633. The next semi-annual event is tentatively scheduled for October 2016.

TABLES
ZONE UPGRADIENT WELLS DOWNGRADIENT WELLS
MW-3S, MW-4S,
MW-5S, MW-8S, MW-9
MW-3D, MW-4D,
MW-5D, MW-8D
Note: Deep Zone wells are for water levels only; sampling not required.
Deep MW-1D, MW-2D
TABLE 1
GROUNDWATER MONITORING PROGRAM
FIRST SEMI-ANNUAL 2016 EVENT
ANSON WASTE MANAGEMENT FACILITY
Shallow MW-2S
Constituent Units MDL MRL SWSL NC 2L Std NC GWPS MW-2S MW-3S MW-4S MW-5S MW-8S MW-9
Antimony Total ug/L 0.220 2.00 6 NE 1 0.220 U 0.220 U 0.220 U 0.220 U 0.257 J 0.220 U
Arsenic Total ug/L 6.80 10.0 10 10 NE 6.80 U 6.80 U 6.80 U 6.80 U 6.80 U 6.80 U
Barium Total ug/L 1.00 10.0 100 700 NE 80.4 J 63.9 J 202 70.3 J 270 618
Beryllium Total ug/L 0.100 1.00 1 NE 4 1.22 0.130 J 0.135 J 0.100 U 0.100 U 0.100 U
Cadmium Total ug/L 0.360 1.00 1 2NE0.360 U 0.360 U 0.360 U 0.360 U 0.360 U 0.360 U
Chromium Total ug/L 1.40 10.0 10 10 NE 1.40 U 1.93 J 9.93 J 3.50 J 1.40 U 4.25 J
Cobalt Total ug/L 1.10 10.0 10 NE 1 2.92 J 12.5 1.10 U 1.10 U 1.10 U 1.66 J
Copper Total ug/L 1.60 10.0 10 1,000 NE 4.37 J 3.01 J 4.37 J 1.60 U 1.60 U 2.22 J
Lead Total ug/L 3.10 10.0 10 15 NE 3.10 U 3.10 U 3.10 U 3.10 U 3.10 U 3.10 U
Nickel Total ug/L 2.20 10.0 50 100 NE 5.10 J 6.96 J 10.7 J 10.5 J 2.20 U 4.70 J
Selenium Total ug/L 0.910 3.00 10 20 NE 0.910 U 0.910 U 0.910 U 0.910 U 1.12 J 0.910 U
Silver Total ug/L 1.90 10.0 10 20 NE 1.90 U 1.90 U 1.90 U 1.90 U 1.90 U 1.90 U
Thallium Total ug/L 0.110 1.00 5.5 NE 0.28 0.110 U 0.110 U 0.110 U 0.110 U 0.110 U 0.110 U
Vanadium Total ug/L 1.40 10.0 25 NE 0.3 1.40 U 10.1 J 6.44 J 3.90 J 1.40 U 9.51 J
Zinc Total ug/L 4.40 10.0 10 1,000 NE 4.40 U 5.32 J 18.0 4.40 U 4.40 U 11.0
Field Dissolved Oxygen mg/L NA NA NA NE NE 3.31 0.03 1.26 2.39 4.13 1.09
Field pH SU NA NA NA NE NE 4.70 5.86 5.93 6.16 6.18 7.15
Field Specific Conductance mS/sec NA NA NA NE NE 0.227 0.279 0.181 0.240 0.386 1.030
Field Temperature °C NA NA NA NE NE 17.58 16.91 17.83 18.01 17.70 19.06
Field Turbidity NTU NA NA NA NE NE 0.0 147 101.1 0.0 0.0 142.1
No VOCs were detected during this event.
NE: Denotes a NC 2L Standard or NC GWPS is not established.
J: Denotes Sample result above the MDL but below the Solid Waste Section Limit (SWSL); estimated value; value may not be accurate.
U: Denotes Not-Detected.
D: Denotes the sample was analyzed at Dilution.
MDL: Denotes Laboratory Method Detection Limit.
MRL: Denotes Laboratory Method Reporting Limit.
GWPS: Denotes Groundwater Protection Standard.
NA: Denotes Not Applicable.
Denotes a concentration at or above an SWSL is also above the 2L Standard or GWPS:
Field data are last recorded measurement during purging.
TABLE 2
GROUNDWATER ANALYTICAL DATA
FIRST SEMI-ANNUAL 2016 EVENT
ANSON WASTE MANAGEMENT FACILITY
Constituent Units NC 2B
Standard MDL MRL SWSL BG-1 BG-2 SG-3 SG-4 SG-5
Antimony Total ug/L NE 0.220 2.00 6 0.220 U 0.220 U 0.220 U 0.220 U 0.220 U
Arsenic Total ug/L 10 6.80 10.0 10 6.80 U 6.80 U 6.80 U 6.80 U 6.80 U
Barium Total ug/L 1,000 1.00 10.0 100 51.7 J 26.0 J 41.8 J 19.6 J 20.9 J
Beryllium Total ug/L 6.5 0.100 1.00 1 0.100 U 0.100 U 0.100 U 0.100 U 0.100 U
Cadmium Total ug/L 2 0.360 1.00 1 0.360 U 0.360 U 0.360 U 0.360 U 0.360 U
Chromium Total ug/L 20 1.40 10.0 10 1.40 U 1.40 U 1.40 U 1.40 U 1.40 U
Cobalt Total ug/L NE 1.10 10.0 10 1.30 J 2.17 J 2.01 J 1.10 U 35.3
Copper Total ug/L 3 1.60 10.0 10 1.60 U 1.60 U 1.60 U 2.05 J 1.60 U
Lead Total ug/L 25 3.10 10.0 10 3.10 U 3.10 U 3.10 U 3.10 U 3.10 U
Nickel Total ug/L 8.3 2.20 10.0 50 2.36 J 2.20 U 2.24 J 2.20 U 4.71 J
Selenium Total ug/L 5 0.910 3.00 10 0.910 U 0.910 U 0.910 U 0.910 U 0.910 U
Silver Total ug/L 0.06 1.90 10.0 10 1.90 U 1.90 U 1.90 U 1.90 U 1.90 U
Thallium Total ug/L NE 0.110 1.00 5.5 0.110 U 0.110 U 0.110 U 0.110 U 0.110 U
Vanadium Total ug/L NE 1.40 10.0 25 4.61 J 2.28 J 3.37 J 2.00 J 1.40 UZinc Total ug/L 50 4.40 10.0 10 4.40 U 4.40 U 4.40 U 4.40 U 5.74 J
Field Dissolved Oxygen mg/L NE NA NA NA 3.97 4.46 7.51 5.18 2.15
Field pH SU NE NA NA NA 6.40 6.26 6.12 5.83 5.19
Field Specific Conductance mS/sec NE NA NA NA 0.131 0.086 0.126 0.116 0.187
Field Temperature °C NE NA NA NA 15.24 17.41 13.45 16.51 20.19
Field Turbidity NTU NE NA NA NA 37.28 22.06 16.93 17.79 0.83
No VOCs were detected during this event.
NE: Denotes a NC 2B Standard is not established.
J: Denotes Sample result above the MDL but below the Solid Waste Section Limit (SWSL); estimated value; value may not be accurate.
U: Denotes Not-Detected.
D: Denotes the sample was analyzed at Dilution.
MDL: Denotes Laboratory Method Detection Limit.
MRL: Denotes Laboratory Method Reporting Limit.
For NC 2B Standard, lowest value utilized from the classifications from the 2B Table published May 15, 2013.
NA: Denotes Not Applicable.
Denotes a concentration at or above an SWSL is also above the 2B Standard:
TABLE 3
SURFACE WATER ANALYTICAL DATA
FIRST SEMI-ANNUAL 2016 EVENT
ANSON WASTE MANAGEMENT FACILITY
Constituent UNITS MDL MRL SWSL ELS #5 ELS #7
Antimony ug/l 0.220 2.00 6 0.759 J 4.78 J D
Arsenic ug/l 6.80 10.0 10 17.2 15.5
Barium ug/l 1.00 10.0 100 2640 2180
Beryllium ug/l 0.100 1.00 1 0.515 J 0.100 U
Cadmium ug/l 0.360 1.00 1 0.360 U 0.360 U
Chromium ug/l 1.40 10.0 10 6.80 J 80.1
Cobalt ug/l 1.10 10.0 10 52.6 41.7
Copper ug/l 1.60 10.0 10 46.5 351
Lead ug/l 3.10 10.0 10 3.10 U 3.10 U
Nickel ug/l 2.20 10.0 50 142 547
Selenium ug/l 0.910 3.00 10 1.67 J 4.55 U D
Silver ug/l 1.90 10.0 10 1.90 U 1.90 U
Thallium ug/l 0.110 1.00 5.5 0.110 U 0.550 U D
Vanadium ug/l 1.40 10.0 25 9.45 J 24.1 J
Zinc ug/l 4.40 10.0 10 69.9 183
pH (field)SU NA NA NE 6.55 7.28
Specific Conductance (field)mS/sec NA NA NE >4,000 >4,000
1,4-Dichlorobenzene ug/l 1.9 10 1 7.2 J D 1.9 U
Benzene ug/l 1.5 10 1 9.9 J D 6.6 J D
Ethylbenzene ug/l 1.3 10 1 36 D 20 D
Toluene ug/l 1.4 10 1 6.2 J D 1.4 U
Xylenes, Total ug/l 4.5 30 5 72 D 41 D
Constituent UNITS MDL MRL SWSL Leachate
Antimony Total ug/L 2.20 20.0 6 4.54 J D
Arsenic Total ug/L 6.80 10.0 10 6.80 U
Barium Total ug/L 1.00 10.0 100 166
Beryllium Total ug/L 0.100 1.00 1 0.100 U
Biochemical Oxygen Demand mg/L 2.0 2.0 NE 210
Cadmium Total ug/L 0.360 1.00 1 0.360 U
Chemical Oxygen Demand mg/L 100 100 NE 4700
Chromium Total ug/L 1.40 10.0 10 34.9
Cobalt Total ug/L 1.10 10.0 10 13.1
Copper Total ug/L 1.60 10.0 10 1.60 U
Cyanide (total)mg/L 0.0049 0.010 10 0.012 J
Lead Total ug/L 3.10 10.0 10 4.79 J
Mercury Total ug/L 0.170 0.200 0.2 0.170 U
Nickel Total ug/L 2.20 10.0 50 87.4
Nitrate as N mg/L 0.025 0.10 10000 0.045 J
Nitrate/Nitrite as N mg/L 0.041 0.10 NE 0.078 J
Nitrite as N mg/L 0.017 0.10 1000 0.033 J
Oil & Grease (HEM)mg/L 2.40 5.00 NE 5.86
Orthophosphate as P mg/L 0.16 0.50 0.16 J
Phenolics mg/L 0.03 0.05 NE 0.95
Phosphorus mg/L 0.12 0.50 NE 5.7 D
Selenium Total ug/L 9.10 30.0 10 9.10 U D
Silver Total ug/L 1.90 10.0 10 1.90 U
Sulfate as SO4 mg/L 2.9 5.0 250000 3.1 J
Thallium Total ug/L 1.10 10.0 5.5 1.10 U D
Total Kjeldahl Nitrogen mg/L 26 48 NE 1100 D
Total Suspended Solids mg/L 120 120 NE 240
Vanadium Total ug/L 1.40 10.0 25 20.1 J
Zinc Total ug/L 4.40 10.0 10 234
pH (field)SU NA NA NE 7.75
Specific Conductance (field) mS/sec NA NA NE >4,000
2-Butanone ug/l 130 500 100 19000 D
4-Methyl-2-pentanone ug/l 110 500 100 150 J D
Acetone ug/l 120 500 100 14000 D
Toluene ug/l 14 100 1 81 J D
Only the VOCs detected are included on this table.
NE: Denotes an SWSL is not established.
J: Denotes Sample result above the MDL but below the SWSL; estimated value; value may not be accurate.
U: Denotes Not-Detected.
D: Denotes the sample was analyzed at Dilution.
MDL: Denotes Laboratory Method Detection Limit.
MRL: Denotes Laboratory Method Reporting Limit.
NA: Denotes Not Applicable.
* Denotes conductivity meter value likely maxed out.
TABLE 4
ENHANCED LINER SYSTEM (ELS) & LEACHATE ANALYTICAL DATA
FIRST SEMI-ANNUAL 2016 EVENT
ANSON WASTE MANAGEMENT FACILITY

APPENDICES

APPENDIX A
POTENTIOMETRIC SURFACE MAPS

Well Top of PVC Casing
Elevation (fmsl)1
Depth to Water
(ft)2
Groundwater
Elevation (fmsl)
MW-2S 318.00 12.67 305.33
MW-3S 295.87 5.39 290.48
MW-4S 294.29 8.56 285.73
MW-5S 282.15 5.39 276.76
MW-8S 311.85 16.32 295.53
MW-9 274.58 13.92 260.66
MW-1D 309.69 18.02 291.67
MW-2D 317.74 14.95 302.79
MW-3D 295.60 6.11 289.49
MW-4D 294.16 8.72 285.44
MW-5D 281.94 5.26 276.68
MW-8D 311.61 15.85 295.76
Note 1: Top of PVC Casing Elevations from Table 1 of the Baseline
Sampling Report dated June 2001 by Almes & Associates, Inc., with the
exception of MW-9 which was provided by Lawrence Associates in email
correspondence dated December 22, 2011.
Note 2: Depth to water measurements collected by S&ME on April 4, 2016.
Groundwater Elevation Summary Table
Anson Waste Management Facility
Shallow Wells
Deep Wells
Groundwater Flow Velocity Calculations
Anson Waste Management Facility
First Semi-Annual 2016 Event

Shallow Zone Velocity
V = [(k)(i)]/(n)
V = [(4.8x10-4 cm/sec)(0.017 ft/ft]/0.11
V = 7.4x10-5 cm/sec
V = 0.21 ft/day
V = 77 ft/yr

Deep Zone Velocity
V = [(k)(i)]/(n)
V = [(5.2x10-4 cm/sec)(0.012 ft/ft]/0.18
V = 3.5x10-5 cm/sec
V = = 9.9 x10-2 ft/day
V = 36 ft/yr

Hydraulic conductivity and effective porosity values from the following document: Design
Hydrogeologic Report, Phase 2 Expansion, Anson Waste Management Facility. Dated
February 2008 by ESP Associates, P.A. & David Garrett & Associates.

Conversion factor: ft/day = 2,835 x cm/sec.

Shallow Zone

Gradient (i) is from the average gradient at site using the potentiometric surface map from
Point A to Point B.
Gradient (i) = Change in Groundwater Elevation along Flow Path
i: From Point A (300 contour) to Point B (265 contour) = 35 ft / 2,105 ft = 0.017 ft/ft

Deep Zone

Gradient (i) is from the average gradient at site using the potentiometric surface map from
Point A to Point B.
Gradient (i) = Change in Groundwater Elevation along Flow Path
i: From Point A (300 contour) to Point B (280 contour) = 20 ft / 1,1614 ft = 0.012 ft/ft

APPENDIX B
STATISTICAL EVALUATIONS
Co
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v
a
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.

APPENDIX C
LABORATORY ANALYTICAL REPORTS
&
FIELD SAMPLING FORMS