4002_GreeneCounty_GWMR_DIN28123_20160906

Greene County Active C&D over Closed Unlined Landfill
Walstonburg, North Carolina
September 2015
MESCO Project Number: G15010.0
Semi-Annual Water Quality Monitoring Report
with Corrective Action Update
Prepared for
Municipal Engineering Services Company, P.A.Garner and Boone, North Carolina
Permit Number: 40-02
P.O. Box 97
Garner, NC 27529
License No. C-0281

TABLE OF CONTENTS
SECTION
Introduction Page 1
Background Page 1
Sampling Procedures Page 2
Field Parameter Data Page 2
Laboratory Results Page 2
Quality Control Samples Page 2
Groundwater Samples Page 2
Surface Water Samples Page 3
Groundwater Characterization Page 3
Corrective Action Update Page 3
Findings Page 3
Closing Page 3
FIGURES
Topographic Map with Site Location Figure 1
Potentiometric Map of Surficial Aquifer with Detections Above 2L Standards Figure 2
Biochlor Natural Attenuation Screening Protocol Matrix (MW-4) Figure 3
Time-Series Graphs of Select Detections Figure 4
Histograms of VOC Concentrations in MW-4 Figure 5
TABLES
Groundwater Monitoring Well Construction Table Table 1
Sampling and Analysis Summary Table 2
Detections Above SWSL, GWP, 2L, 2B, GWP or MCL (Appendix 1) Table 3
Detections Above MDL (Appendix II) Table 4
Hydrologic Properties at Monitoring Well Locations Table 5
MNA Parameter Data Summary Table 6
APPENDICIES
Laboratory Analysis Reports, Field Parameter Data and Chains of Custody Appendix A
July 11, 2016
Ms. Jaclynne Drummond
Solid Waste Section (SWS)
NC Department of Environmental Quality (NCDEQ)
2090 US Highway 70
Swannanoa, NC 28778
Subject: Semi-Annual Water Quality Monitoring Report with Corrective Action Update
Greene County Active C&D and Closed Unlined Landfill
MESCO Project No. G15010.0
Permit No. 40-02
Event Date: September 16, 2015
Dear Ms. Drummond:
Introduction
On behalf of Greene County, Municipal Engineering Services Company, P.A. (MESCO) is pleased to present this
Semi-Annual Water Quality Report with Corrective Action Update for fall 2015 at the active Construction and
Demolition (C&D) Landfill and closed Unlined Sanitary Landfill. NCDEQ Solid Waste Rules 15ANCAC13B.1630
through .1637 requires that Greene County provide this report to the SWS on a semi-annual basis. This report
documents the quality of the ground and surface waters during this monitoring event performed on September 16,
2015. A brief corrective action update and qualitative evaluation comparing current and historical data is also
presented. Constituents detected in concentrations above North Carolina Groundwater Standards (2L) were benzene
and vinyl chloride in sample MW-4.
Background
The Greene County Active Construction and Demolition (C&D) Landfill and Closed Unlined Sanitary Landfill is
located off Fire Tower Road (SR 1239), Walstonburg, Greene County, North Carolina and operates under permit #40-
02. A topographic map showing the facility location is included as Figure 1.
Prior to operating as a C&D landfill, the site operated as an approximate 13-acre unlined sanitary landfill which
stopped receiving waste prior to January 1, 1998 in accordance with the Greene County Transition Plan. The C&D
landfill is operating on a portion of the top of the MSW unit which are monitored together.
Water quality has been monitored at this facility on at least a semi-annual basis since 1994. MESCO submitted an
Assessment and Corrective Action (ACM) [DIN:8776] report dated August 30, 2007. MESCO then developed a
Corrective Action Plan (CAP) which was revised on February 12, 2010 (CAP-Rev. 5) [DIN:9670] and subsequently
approved on February 16, 2010 [DIN:671]. Groundwater remediation using monitored natural attenuation (MNA)
was initiated on March 30, 2010 and has continued on a semi-annual basis since. A Corrective Action Evaluation
Report (CAER) was submitted to the SWS on October 16, 2012 (DIN:17502) which was reviewed by the SWS and
responded to on December 6, 2012 (DIN:17837).

As specified within rule 15A NCAC 13B.1632(i), the SWS Environmental Monitoring Report Form, and SWS
memorandums this report contains sampling procedures, field and laboratory results, corrective action update,
groundwater and surface water characterization, and findings. Well construction summary table, sampling and
analysis summary table, detections compared to Standards tables, a groundwater flow directions/rates table,
potentiometric map, quality assurance/quality control data, and field/laboratory analytical data results are enclosed
herein.
Sampling Procedures
Environment 1 (E1) of Greenville, NC, reportedly performed this monitoring event utilizing portable monitoring
methodology in accordance with the approved Sampling & Analysis Plan (SAP) contained in the CAP-Rev.5. E1
reportedly collected groundwater samples from all locations designated in the SAP which includes five
downgradient groundwater monitoring wells (MW-4, MW-5, MW-6, MW-7 and MW-8), one background well
(MW-1R) and surface water point (Downstream). Quality control measures included submittal and analysis of an
equipment blank (EB), field blank (FB) and trip blank (TB). Designated surface water point (Upstream) was
reported to be dry. Surface water and groundwater monitoring locations are depicted on Figure 1 and Figure 2
respectively. A summary detailing the construction of the water monitoring wells is presented on Table 1.
Static water levels in each well were measured electronically prior to purging. Samples were transported under C-
O-C protocol and analyzed within the hold times specified for each method.
Field Parameter Data
E1 recorded the field parameters pH, specific conductance, temperature, turbidity, oxidation reduction potential
(ORP) and dissolved oxygen (DO) which are presented in the laboratory analysis report in Appendix A.
Laboratory Results
E1 performed analysis of groundwater samples for the constituents listed in Appendix II of 40 CFR 258. Both total
and dissolved metals listed in Appendix II of 40 CFR 258 were reported as requested by the SWS in the CAER
response (DIN 17837). In addition, samples from MW-4 and background well MW-1, were analyzed for the full
suite of MNA performance parameters as part of corrective action. MNA analysis was conducted for volatile fatty
acids, methane, ethane, ethene, and dissolved hydrogen by Microseeps Inc. of Pittsburgh, PA. A sampling and
analysis table summarizing the locations, constituents, and methods is presented on Table 2. Laboratory results and
C-O-Cs are contained in Appendix A.
Water samples were analyzed to the laboratory-established Method Detection Limits (MDL), which are at or below
current Solid Waste Section Limits (SWSL). Table 3 summarizes Appendix I contaminant constituents detected in
groundwater and surface water samples above the current SWSL, Groundwater Protection Standards (GWP), North
Carolina Groundwater Standards (2L), the applicable Class C North Carolina Surface Water Standards (2B) and
Maximum Contaminant Levels (MCL) also known as “Federal Primary Drinking Water Standards”. Table 4
summarizes the few “j-qualified” Appendix II exclusive detections (defined in this report as not also listed in
Appendix I ) above the MDL.
Quality Control Samples
Four of the seventeen (24%) targeted total metals were detected in low non-quantifiable (“j” qualified)
concentrations in the FB. Since no metals were detected in excess of any regulatory Standard any lab or field
induced artifact contamination is inconsequential.
2
Groundwater Samples
Metals were not detected in any sample above 2L Standards.
VOCs benzene and vinyl chloride have consistently been detected in concentrations above their respective 2L
Standards in samples collected from MW-4 since the detection levels were reduced in March 2007.
Appendix II exclusive parameters, defined in this report as not also listed in Appendix I, were not detected in levels
above the SWSL nor established applicable Standards.
A site map spatially depicting contaminants detected in excess of the 2L Standard during this event is presented on
Figure 2.
Surface Water Samples
No constituents were detected in excess of applicable 2B Standard in the surface water sample collected
downstream.
Groundwater Characterization
A single-day potentiometric map of the uppermost aquifer is presented on Figure 2, using ground water elevation
data reported by E1 for this event. Reported groundwater elevations were all within their respective historically
identified range. Groundwater flow direction and rates were calculated based on reported data and are included in
Table 5. Estimated flow flow rates during this event, quantified through modified Darcy's equation, ranged from
about 10 ft/yr (MW-4) to 289 ft/yr (MW-8) for a site-wide average of approximately 70 ft/yr.
Corrective Action Update
Semi-annual MNA monitoring of MW-4 was initiated on March 30, 2010 and has consistently been performed for
the full suite of SWS recommended parameters for 12 consecutive semi-annual events. The most recent MNA data
is presented in Table 5. The MNA data for September 2015 at MW-4 was entered into the Biochlor natural
attenuation screening protocol matrix. The screening matrix score was 21 which the USEPA protocol interprets as
any value over 20 as strong evidence of anaerobic biodegredation of chlorinated organics (Figure 3).
Findings
The laboratory results indicate the surficial aquifer near MW-4 continue to be impacted by low level dissolved phase
Appendix I VOC(s) in concentrations above the 2L Standard. Quantitative evaluations reveal concentrations of
constituents detected above the 2L Standard during this event remain within their own respective historically
identified range and an increasing trend is not evident (Figure 4).
MW-4 exhibited a reduction of total VOCs (-72%) with both benzene and vinyl chloride decreasing (-19%)
compared to their respective baseline averages established during the initial four corrective action events (Figure 5).
The horizontal plume extent beyond MW-4 is likely confined within the review boundary as evidenced by the
continued lack of detections in sentinel wells MW-7 and MW-8.
Landfill gas has previously been detected in the head-space of MW-4 and in the migration monitoring probe MP-4
located between the waste and MW-4.
Generally consistent with the findings of the CAER, targeted contaminant concentrations are decreasing and there is
strong evidence that natural attenuation is occurring in the groundwater at the facility.
3
Figures
Topographic Map with Site Location
FIGURE 1
Greene County Active C&D over Closed MSWLF
QUADRANGLE LEGEND
NOTE: Topographical map assembled from corresponding USGS 7.5-min. quadrangles of the subject region.
105 Landfill Road (SR1257)
Walstonburg, NC
Lat:35-31-29.7520
Long:-77-41-49.4325
Northing:648520.2533
Easting:2387660.4409
DOWNSTREAM
UPSTREAM
3,334'0
AC
T
I
V
E

C
&
D

O
V
E
R

C
L
O
S
E
D

U
N
L
I
N
E
D
LA
N
D
F
I
L
L

F
A
C
I
L
I
T
Y
GR
E
E
N
E

C
O
U
N
T
Y
NO
R
T
H

C
A
R
O
L
I
N
A
MW-4
Benzene - 2.8 ug/l Vinyl
Chloride - 5.1 ug/l
September 16, 2015
WELL #
15A NCAC 2L Groundwater Quality Standard 1.0 0.03
MW-1R 121.78 5.21 116.57
MW-4 117.89 20.03 97.86 2.8 5.1
MW-5 115.76 18.91 96.85
MW-6 117.41 11.16 106.25
MW-7 110.48 13.83 96.65
MW-8 111.36 13.12 98.24
PZ-2 119.59 17.74 101.85
Groundwater Levels & VOCs Detected Above 2L Standards
TOP OF
CASING
ELEVATION
DEPTH
TO
WATER
GROUNDWATER
POTENTIOMETRIC
ELEVATION
BENZENE
(ug/l)
VCM
(ug/l)
G
G
Natural Attenuation Interpretation Score
Screening Inadequate evidence for anaerobic biodegradation* of chlorinated organics 0 to 5
Protocol Limited evidence for anaerobic biodegradation* of chlorinated organics 6 to 14 Score:21
Adequate evidence for anaerobic biodegradation* of chlorinated organics 15 to 20
Strong evidence for anaerobic biodegradation* of chlorinated organics >20 Scroll to End of Table
Concentration in PointsAnalysisMost Contam. Zone Interpretation Yes No Awarded
Oxygen*<0.5 mg/L Tolerated, suppresses the reductive pathway at higher 3
concentrations
> 5mg/L Not tolerated; however, VC may be oxidized aerobically 0
Nitrate*<1 mg/L At higher concentrations may compete with reductive 2
pathway
Iron II*>1 mg/L Reductive pathway possible; VC may be oxidized under 3
Fe(III)-reducing conditions
Sulfate*<20 mg/L At higher concentrations may compete with reductive 2
pathway
Sulfide*>1 mg/L Reductive pathway possible 0

Methane*>0.5 mg/L Ultimate reductive daughter product, VC Accumulates 3
Oxidation <50 millivolts (mV)Reductive pathway possible 0
Reduction
Potential* (ORP)<-100mV Reductive pathway likely 0

pH*5 < pH < 9 Optimal range for reductive pathway 0
TOC >20 mg/L Carbon and energy source; drives dechlorination; can be 0
natural or anthropogenic
Temperature*>20oC At T >20oC biochemical process is accelerated 1
Carbon Dioxide >2x background Ultimate oxidative daughter product 1
Alkalinity >2x background Results from interaction of carbon dioxide with aquifer 1
minerals
Chloride*>2x background Daughter product of organic chlorine 0
Hydrogen >1 nM Reductive pathway possible, VC may accumulate 3
Volatile Fatty Acids >0.1 mg/L Intermediates resulting from biodegradation of aromatic 0
compounds; carbon and energy source
BTEX*>0.1 mg/L Carbon and energy source; drives dechlorination 0
PCE*Material released 0
TCE*Daughter product of PCE a/0

DCE*Daughter product of TCE.
If cis is greater than 80% of total DCE it is likely a daughter 0
product of TCEa/; 1,1-DCE can be a chem. reaction product of TCA
VC*Daughter product of DCEa/2
1,1,1- Material released 0
Trichloroethane*
DCA Daughter product of TCA under reducing conditions 0
Carbon Material released 0
Tetrachloride
Chloroethane*Daughter product of DCA or VC under reducing conditions 0
Ethene/Ethane >0.01 mg/L Daughter product of VC/ethene 0
>0.1 mg/L Daughter product of VC/ethene 0
Chloroform Daughter product of Carbon Tetrachloride 0
Dichloromethane Daughter product of Chloroform 0

* required analysis.
a/ Points awarded only if it can be shown that the compound is a daughter product
(i.e., not a constituent of the source NAPL).
End of Form
* reductive dechlorination
The following is taken from the USEPA protocol (USEPA, 1998). The results of this scoring process have no regulatory significance.
ResetSCORE
Greene County Active C&D over Closed MSWLF Page 1 of 1
Figure 4
Time-Series Graphs of Select Constituents
September 16, 2015
2L
Non-Detects Represented at Detection Limit
2L
Greene County Active C&D and Closed MSWLF Page 1 of 1
Figure 5
Histograms of VOC Concentrations in MW-4
(March 30, 2010-September 28, 2011) Compared to September 16, 2015
BASELINE
MARCH 2010 59.30 5.30 10.30
SEPT. 2010 17.40 2.50 4.10
MARCH 2011 17.50 3.00 5.40
SEPT. 2011 19.10 3.00 5.30
BASELINE AVERAGE 28.33 3.45 6.28
CURRENT
SEPT 2015 7.90 2.80 5.10
COMPARISON BENZENE
-20.43 -0.65 -1.18
DIFFERENCE (%)-72 -19 -19
TOTAL
VOCS
(ug/l)
BENZENE
(ug/l)
VINYL
CHLORIDE
(ug/l)
TOTAL
VOCS
(ug/l)
BENZENE
(ug/l)
VINYL
CHLORIDE
(ug/l)
TOTAL
VOCS
VINYL
CHLORIDE
DIFFERENCE (ug/l)
TOTAL VOCS BENZENE VINYL CHLORIDE
0
2.5
5
7.5
10
12.5
15
17.5
20
22.5
25
27.5
30
VOC(s)BASELINE AVERAGES COMPARED TO SEPT. 2015
in MW-4
BASELINE AVERAGE
SEPT 2015
ug
/L
Tables
Greene County Active C&D and Closed MSWLF Page 1 of 1
Table 1
Groundwater Monitoring Well Construction Table
September 15, 2015
Latitude Longitude
(inches) (ft)
MW-1R 11/19/1981 2 18.20 3.20 15 Soil 121.78 119.79 116.57 5.21 35.525139 -77.695158
MW-4 8/26/1994 2 24.10 9.10 15 Soil 117.89 115.14 97.86 20.03 35.526914 -77.692369
MW-5 8/26/1994 2 29.00 14.00 15 Soil 115.76 113.16 96.85 18.91 35.526133 -77.692242
MW-6 8/28/1994 2 28.80 13.80 15 Soil 117.41 114.54 106.25 11.16 35.525008 -77.692431
MW-7 8/29/1994 2 18.50 6.50 12 Soil 110.48 107.75 96.65 13.83 35.526639 -77.691833
MW-8 6/21/2007 2 17.98 6.98 11 Soil 111.36 108.71 98.24 13.12 35.527039 -77.691842
PZ-2 11/19/1981 2 20.00 10.00 10 Soil 119.59 116.58 101.85 17.74 35.527278 -77.696911
NOTE:
Monitoring
Well
Date
Installed
Well Diameter Total Well Depth Top of Screen Depth Screen Length Geology of
Screened Interval
Top of Casing Elevation Ground Elevation Groundwater Elevation Depth to Water
(ft bgs)(ft bgs)(ft amsl) (ft amsl)(ft amsl)(ft btoc)
bgs = below ground surface
amsl= above mean sea level
btoc = below top casing (PVC well casing)
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 2
Sampling and Analysis Summary
September 16, 2015
MNA Field Parameter
Pe
s
t
i
c
i
d
e
s
He
r
b
i
c
i
d
e
s
-
C
h
l
o
r
i
n
a
t
e
d
To
t
a
l

C
y
a
n
i
d
e
Su
l
f
i
d
e
VF
A
Hy
d
r
o
g
e
n
Di
s
s
o
l
v
e
d

C
O
2
Al
k
a
l
i
n
i
t
y
Su
l
f
a
t
e
Su
l
f
i
d
e
Ch
l
o
r
i
d
e
TO
C
CO
D
BO
D
Ir
o
n
,

t
o
t
a
l
Ir
o
n
,

t
o
t
a
l

d
i
s
s
o
l
v
e
d
Ir
o
n
,

F
e
r
r
o
u
s
Ni
t
r
a
t
e
Tu
r
b
i
d
i
t
y
Di
s
s
o
l
v
e
d

O
x
y
g
e
n

(
D
O
)
Ox
i
d
a
t
i
o
n

R
e
d
u
c
t
i
o
n

P
o
t
e
n
t
i
a
l

(
O
R
P
)
Te
m
p
e
r
a
t
u
r
e
Co
n
d
u
c
t
i
v
i
t
y
pH
La
b

E
P
A

8
2
6
0
B
L
a
b

E
P
A

6
0
0
0
/
7
0
0
0
L
a
b

E
P
A
2
0
0
.
8
L
a
b

E
P
A

8
0
8
1
B
L
a
b

S
W
8
1
5
1
A
L
a
b

E
P
A

8
0
8
1
B
La
b

E
P
A

8
2
7
0
D
La
b

E
P
A

9
0
1
4
La
b

S
M
1
8

4
5
0
0
-
S

D
La
b

A
M
2
3
G
La
b

A
M
2
0
G
A
X
La
b

A
M
2
0
G
A
X
La
b

S
M
4
5
0
0
C
O
2
C
La
b

S
M
4
2
6
C
La
b

S
M
1
8

4
5
0
0
-
S
2
D
La
b

S
M
4
5
0
0
-
C
L
B
La
b

S
M

5
3
1
0
C
La
b

H
A
C
H
8
0
0
0
La
b

S
M
5
2
1
0
B
La
b

S
M
3
1
1
1
B
La
b

S
M
3
1
1
1
B
La
b

E
P
A
3
5
3
.
2
La
b

S
M
2
1
3
0
B
Fi
e
l
d

M
e
t
e
r
Fi
e
l
d

M
e
t
e
r
Fi
e
l
d

M
e
t
e
r
Fi
e
l
d

M
e
t
e
r
Fi
e
l
d

M
e
t
e
r
MW-1R x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
MW-4 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
MW-5 x x x x x x x x x x x x x x x
MW-6 x x x x x x x x x x x x x x x
MW-7 x x x x x x x x x x x x x x x
MW-8 x x x x x x x x x x x x x x x
Downstream x x x x x x x x x
Upstream Reported to be dry so not sampled
EB x x x x x x x x
TB x
FB x x
App. II
VO
C
s

(
A
p
p I
I)
T ot
a
l
M e ta
l
s
(
A
p
p
I
I)
Me
t
a
ls
,

T
ot
a
l
Di
s
s
o lv
e
d
(
A
p
p
II)
Po
ly
ch
l
or
i
na
te
d
b
ip
he
ny
l (
P
C
B
)
Se
m
iv
o
la
ti
l
e
O
r
g
an
ic
s

(
S
V
O
C
s
)
Me
th
a
ne
/E
t
he
ne
/
Et
h
an
e
L ab
S M 23
2
0
B
La
b
31
1
1
B
-
99
App I & II = Appendix Lists from current 40 CFR 258
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 3
Detections in Water Samples Above SWSL, 2L, 2B, GWP, or MCL (Appendix I)
September 16, 2015
Sample ID Result Unit
MW-4 Benzene 9/16/15 2.8 0.24 1 1 5 L &/or LFG
MW-4 Vinyl Chloride 9/16/15 5.1 0.63 1 0.03 2 L &/or LFG
MW-4 Thallium, total 9/16/15 0.48J 0.02 1 NE 0.28 2
MW-4 Thallium, Dissolved 9/16/15 0.06J 0.02 1 NE 0.28 2
MW-4 Vanadium, total 9/16/15 7J 0.22 10 NE 3.5 NE
MW-4 Vanadium, Dissolved 9/16/15 0.49J 0.07 10 NE 3.5 NE
MW-4 Zinc, total 9/16/15 16 0.2 10 1000 5000
MW-5 9/16/15 3.7 0.39 1 6 75
Downstream Vanadium, total 9/16/15 6J 0.22 10 NE NE
Downstream Vanadium, Dissolved 9/16/15 3J 0.07 10 NE NE
Downstream Zinc, total 9/16/15 11 0.2 10 50 5000
A definitive source of the detection was not determined as part of this report.
J =The reported value is between the laboratory method detection limit (MDL) and the laboratory method reporting limit (MRL),
adjusted for actual sample preparation data and moisture content, where applicable
L = Leachate
LFG = Landfill Gas
NE = Not Established
BOLD = Concentration > 2L, 2B, GWP or MCL Standard
Parameter Name 1 Sample
Date MDL 2 SWSL 3 2L 4 2B 5 GWP 6 MCL 7 Preliminary
Cause 8
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
1,4-Dichlorobenzene ug/l
ug/l
ug/l
ug/l
1 Table contains constituents detected at or above SWSL, 2L, 2B, GWP or MCL
2 MDL = Method Detection Limit
3 SWSL = Solid Waste Section Reporting Limit
4 2L = North Carolina 15A NCAC 2L Groundwater Quality Standard
5 2B = North Carolina 15 NCAC 2B Surface Water Quality Standard for this Specific Stream Classification
6 GWP = Groundwater Protection Standard
7 MCL = Primary Drinking Water Standard (not currently applicable for regulatory comparisons)
8 Preliminary Cause = Refers to a preliminary analysis of the cause and/or source of a detection over the respective 2L/2B Standard.
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 4
Detections in Water Samples Above MDL (Appendix II Exclusive)
September 16, 2015
Sample ID Result Unit
MW-1R Tin, total 9/16/15 0.09J 0.06 100 NE NE
MW-1R Sulfate 9/16/15 11500J 5000 250000 250000 NE
MW-4 Tin, total 9/16/15 0.77J 0.06 100 NE NE
MW-4 Sulfate 9/16/15 12900J 5000 250000 250000 NE
MW-5 Tin, total 9/16/15 0.5J 0.06 100 NE NE
MW-6 Tin, total 9/16/15 0.18J 0.06 100 NE NE
MW-7 Mercury, total 9/16/15 0.08J 0.05 0.2 1 2
EB Mercury, total 9/16/15 0.07J 0.05 0.2 1 2
FB Mercury, total 9/16/15 0.05J 0.05 0.2 1 2
A definitive source of the detection was not determined as part of this report.
j =The reported value is between the laboratory method detection limit (MDL) and the laboratory method reporting limit (MRL),
adjusted for actual sample preparation data and moisture content, where applicable
NE = Not Established
BOLD = Concentration > 2L, 2B, GWP or MCL Standard
Parameter Name 1 Sample
Date MDL 2 SWSL 3 2L 4 2B 5 GWP 6 MCL 7 Preliminary
Cause 8
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
1 Table contains constituents listed in 40 CFR Appendix II but not on Appendix I that were detected at or above MDL
2 MDL = Method Detection Limit
3 SWSL = Solid Waste Section Reporting Limit
4 2L = North Carolina 15A NCAC 2L Groundwater Quality Standard
5 2B = North Carolina 15 NCAC 2B Surface Water Quality Standard for this Specific Stream Classification
6 GWP = Groundwater Protection Standard
7 MCL = Primary Drinking Water Standard (not currently applicable for regulatory comparisons)
8 Preliminary Cause = Refers to a preliminary analysis of the cause and/or source of a detection over the respective 2L/2B Standard.
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 5
September 16, 2015
MW-1R 1.20E-04 15 0.029 24 N32E 5.21 116.57
MW-4 1.10E-04 15 0.013 10 S62E 20.03 97.86
MW-5 1.40E-04 15 0.024 23 N61E 18.91 96.85
MW-6 1.90E-04 15 0.025 33 N31E 11.16 106.25
MW-7 1.98E-04 7 0.015 43 S36E 13.83 96.65
MW-8 1.14E-03 7 0.017 289 S16E 13.12 98.24
PZ-2 0.010 N09E 17.74 101.85
Minimum 1.10E-04 7 0.013 10 -5.21 96.65
Average 3.16E-04 12 0.020 70 -14.29 102.04
Maximum 1.14E-03 15 0.029 289 -20.03 116.57
NOTE:
Data for hydraulic conductivities for MW-7 & MW-8 obtained from slug tests performed by MESCO (June, 2007)
where
Hydrologic Properties at Monitoring Well Locations
Monitoring
Well
Hydraulic
Conductivity
(cm/sec)
Effective
Porosity (%)
Hydraulic
Gradient
(ft/ft)
Linear Velocity
(ft/yr)
Flow
Direction
Depth to
Groundwater
(ft btoc)
Groundwater
Potentiometric Elevation
(ft amsl)
na na na
Data for hydraulic conductivities for wells except MW-7 & MW-8 obtained from GAI Consultants' Water Quality Modifications (October, 1994)
Hydrologic gradient from water level elevations reportedly taken on September 16, 2015
Flow rate (Q) is defined by modified Darcy's equation:
K= hydraulic conductivity
ne = effective porosity
dh= head difference
dl= horizontal distance
Q=−K
ne
⋅dh
dl
Greene County Active C&D over Closed MSWLF Page 1 of 1
Table 6
MNA Parameters at Monitoring Well Locations Summary
September 16, 2015
Parameters Method Units MW-1R MW-4
09/16/15 09/16/15
VFA – Acetic Acid AM23G 8 30 j 62 j
AM23G 7 14 j 12 j
AM23G 120 <120 <120
AM23G 100 <100 <100
AM23G 8 <8 <8
VFA – Lactic Acid AM23G 12 14 j 180
AM23G 14 <14 <14
AM23G 11 <11 <11
AM23G 9 <9 <9
Hydrogen AM20GAX 0.09 2.4 2.7
Methane AM20GAX 0.01 0.08 6900
AM20GAX 0 0.03 0.21
Ethane AM20GAX 0 0.0051 j 0.03
CO2-Dissolved 4500CO2C 1000 53800 388000
Alkalinity 2320B-97 1000 2000 145000
Sulfate 4500SO42E97 5000 11500 j 12900 j
Sulfide 4500S2D-00 100 <100 <100
Chloride 4500CLB-97 5000 91000 <5000
TOC 5310C-00 85 1070 5510
COD H8000-79 20000 <20000 30000
BOD 5210B-01 2000 <2000 <2000
Iron, Total 3111B-99 8.64 43 j 67594
Iron, Ferrous 3500FEB-97 50 <50 59780
Nitrate 353.2 R2-93 40 3780 j 50 j
Temperature 2550B-00 0 C 23 21
ORP 2580B 0 98 74
DO 4500OG-01 100 620 340
pH 4500HB-00 0.1 Units 4.7 5.6
Specific Conductance 2510B-97 1 344 364
Turbidity 2130B-01 1 NTU <1 5.62
Notes:
VFA = Volatile Fatty Acids
j = Estimated concentration greater than the set method detection limit (MDL) and less then the set reporting limit (PQL).
mdl*
ug/l
VFA – Butyric Acid ug/l
VFA – Hexanoic Acid ug/l
VFA – i-Hexanoic Acid ug/l
VFA – i-Pentanoic Acid ug/l
ug/l
VFA – Pentaonic Acid ug/l
VFA – Propionic Acid ug/l
VFA – Pyruvic Acid ug/l
nM
ug/l
Ethene ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
ug/l
uMhos/cm
mdl* = Lowest Method Detection Limit for Lab Parameters or Lowest Field Measurement Possible
Appendix A
Laboratory Analysis Report
Field Analysis Report
Chains of Custody