6709_OnslowCountyMSWLF_GWMR_20171109

Onslow County
Subtitle D Landfill
Facility Permit No. 6709-MSWLF-1997
Semi-Annual Sampling Report
October 2017 Sampling Event
Prepared November 2017
Onslow County

5400 Glenwood Ave, Suite 400
Raleigh, North Carolina 27612
tel: [phone]
fax: [phone]

November 9, 2017

Mr. Ervin Lane
North Carolina Department of Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699-1646

Subject: October 2017 Semi-Annual Groundwater Sampling Report
Onslow County Subtitle D Landfill
Facility Permit # 6709-MSWLF-1997

Dear Mr. Lane:
CDM Smith Inc. (CDM Smith), on behalf of Onslow County (County), is submitting an electronic copy of
the October 2017 semi-annual sampling event report. This letter report presents the results of the
recently completed sampling event at the Onslow County Subtitle D Landfill (site) and constitutes the
second semi-annual sampling event for 2017. The approved groundwater monitoring network consists
of the following wells: MW-1, -1a, -2, -2a, -3, -4, -5, -6, -7, -8, -8a, and -9. Monitoring well MW-4a was
not sampled during this event and will only be sampled if it is reinstated into the approved groundwater
monitoring network. Monitoring well MW-9 was installed on December 19, 2016, as part of the Phase 4
expansion. Field activities, sampling, and landfill gas monitoring results are discussed below.
Field Activities
Groundwater samples from the Onslow County Subtitle D Landfill were collected on October 4-5, 2017.
Groundwater samples from all wells were collected by use of disposable, laboratory decontaminated,
bailers. Monitoring well locations are presented on Figure 1 and well construction details are provided
in Table 1.
Groundwater elevations were measured at each well prior to sampling and are presented in Table 2.
These groundwater elevations were used to construct potentiometric contours for this sampling event
as shown on Figure 1. The groundwater elevations and potentiometric contours were used to estimate
groundwater velocities at each well and are presented in Table 3. After the depth to groundwater was
determined, three well volumes of water were removed from each well prior to sampling to provide
fresh formation water within the well water column. Each well volume was measured in the field for pH,
conductivity, temperature, turbidity, dissolved oxygen, and oxidation-reduction potential using a YSI-556
multi-parameter water quality meter and a HANNA HI 98703 turbidity meter. Monitoring wells MW-6,
-8, and -9 had elevated turbidity at the time of sample collection (i.e. turbidity greater than 10

Mr. Ervin Lane
November 9, 2017
Page 2

Nephelometric Turbidity Units (NTUs)). Dissolved metal samples were collected from these wells as
discussed below. Water quality parameters at the time of sampling are presented in Table 4.
Sampling Results
Environmental Conservation Laboratories, Inc., located in Cary, North Carolina, analyzed the
groundwater samples for North Carolina Appendix I volatile organics and Appendix I metals. In
accordance with Solid Waste Section guidelines the analytical results were reported to the laboratory
specific method detection limit (MDL) and are quantifiable at or below the Solid Waste Section Limits
(SWSLs). All monitoring wells for the Onslow County Subtitle D Landfill had detections of analytes above
the MDL with a majority of the detections below the SWSL. These detections were qualified as
estimated concentrations and are denoted as “J” flags throughout the laboratory report.
The following list indicates analytes detected above the SWSL at each sampling location. “J” flag
detections are not included. Underlined analytes exceeded the 15A NCAC 02L .0202 (NC 2L)
Groundwater Quality Standard or Groundwater Protection Standard. A complete summary of all
detected and estimated concentrations from April 2011 to October 2017 is presented in Table 5. The
laboratory data report is provided in Appendix A.
MW-1 (Background)
Metals: None Detected
Volatile Organic Compounds: None Detected
MW-1a (Background)
Metals: None Detected
Volatile Organic Compounds: None Detected
MW-2
Metals: None Detected
Volatile Organic Compounds: None Detected
MW-2a
Metals: Arsenic, Lead
Volatile Organic Compounds: None Detected
MW-3
Metals: None Detected
Volatile Organic Compounds: None Detected

Mr. Ervin Lane
November 9, 2017
Page 3

MW-4
Metals: None Detected
Volatile Organic Compounds: None Detected
MW-5
Metals: Zinc
Volatile Organic Compounds: None Detected
MW-6
Metals: Zinc
Volatile Organic Compounds: None Detected
MW-7
Metals: None Detected
Volatile Organic Compounds: None Detected
MW-8
Metals: Zinc
Volatile Organic Compounds: None Detected
MW-8a
Metals: None Detected
Volatile Organic Compounds: None Detected
MW-9
Metals: Arsenic, Beryllium, Chromium, Lead, Vanadium, Zinc
Volatile Organic Compounds: None Detected
Equipment Blank
Metals: None Detected
Volatile Organic Compounds: None Detected
Trip Blank
Metals: Not Analyzed
Volatile Organic Compounds: None Detected
“J” flags were not included in the previous list, but several sampling locations had “J” flag detections
that exceeded the standards. The “J” flag constituents above the standards along with the location are
listed below:
Cobalt: MW-2, -2a, -5, -6, -7, -8, and -9

Mr. Ervin Lane
November 9, 2017
Page 4

Thallium: MW-1, -1a, -2, -2a, -3, -4, -5, -6, -7, -8, -8a, and -9
Vanadium: MW-1a, -2, -2a, -4, -5, -6, -7, -8, and -8a
The equipment blank had estimated detections of chloroform, copper, and nickel below their respective
NC 2L Standards. No analytes were detected in the trip blank. A duplicate sample, labeled DUP, was
collected from MW-5. The duplicate sample had similar concentrations to the MW-5 sample, with the
exceptions of estimated detections of nickel and acetone in the duplicate sample and estimated
detections of chromium and lead in the parent sample. These estimated detections were below their
respective NC 2L Standards.
Table 6 presents a summary of all parameters detected during the October 2017 sampling event that
exceeded the NC 2L or Groundwater Protection Standards. A summary of NC 2L, Groundwater
Protection, and 15A NCAC 02B Surface Water Standard exceedances for the Subtitle D and Closed
landfills is provided on Figure 2.
CDM Smith, on behalf of the County, submitted the results of an Alternate Source Demonstration (ASD)
for the site on November 8, 2016. The ASD was prepared in accordance with Solid Waste rule
.1633(c)(3), to demonstrate that select metals exceeding the NC 2L or Groundwater Protection
Standards detected in monitoring wells at the site are naturally occurring and not related to a release
from the landfill. As part of the ASD, in order to determine if turbidity was a contributing factor to total
reported metals, filtered samples were collected during the August 2016 sampling event and analyzed
for dissolved metals. Based on the sampling results, standard metal exceedances were determined to be
indicative of naturally occurring background concentrations as opposed to a release from the landfill.
During the October 2017 sampling event, filtered metals samples were collected from monitoring wells
MW-6, -8, and -9 due to elevated turbidity (i.e. greater than 10 NTUs). Total metals that exceeded the
NC 2L or Groundwater Protection Standards from these wells were analyzed for dissolved metals. Below
is a summary of the dissolved metals exceedances. All exceedances were reported as “J” flag detections.
Cobalt: MW-6 and -9
Thallium: MW-6, -8, and -9
Vanadium: MW-6
Dissolved metal sample results are provided in Table 5. Based on qualitative and quantitative evaluation
of current and historic groundwater sampling data, the NC 2L or Groundwater Protection Standard
metal exceedances from the October 2017 sampling event were determined to be indicative of naturally
occurring background concentrations as opposed to a release from the landfill.
Onslow County will continue with the detection monitoring program. The next sampling event will take
place during the spring of 2018.

Mr. Ervin Lane
November 9, 2017
Page 5

Landfill Gas Monitoring
The approved landfill gas monitoring network consists of the following wells: M-1, -2, -3, -4, -5, -6, -7,
and -8. Landfill gas well M-8 was installed on December 19, 2016, as part of the Phase 4 expansion. Site
structures that are monitored on the property include the scale house, administration building,
materials recycling facility, storage building, maintenance shop, vehicle maintenance facility, and
leachate storage tanks. Quarterly landfill gas monitoring of the Subtitle D Landfill was completed on
September 29 and October 19, 2017, using a GEM 5000 or GEM 2000 Plus landfill gas analyzer. No
methane or hydrogen sulfide was detected in any monitoring wells or site structures during either
event. Copies of the quarterly landfill gas monitoring results and GEM 5000 and 2000 Plus calibration
data have been placed in the landfill operating record and are provided in Appendix B.
If you have any questions or require further explanation, do not hesitate to call me at [phone].
Sincerely,

Mathew F. Colone, P.G.
CDM Smith Inc.

cc: Scott Bost, Onslow County
Tables
Table 1
Monitoring Well Construction Summary
Onslow County Subtitle D Landfill
6709-MSWLF-1997
Screen
Interval
Filter
Interval
Seal
Interval
6709-MSWLF-1997 MW-1 12/17/1997 34.80724 77.54568 Surficial Aquifer 15.0 5.0-15.0 3.5-15.0 2.0-3.5 2.0
6709-MSWLF-1997 MW-1a 12/17/1997 34.80720 77.54570 Surficial Aquifer 24.0 19.0-24.0 17.0-24.0 13.0-17.0 2.0
6709-MSWLF-1997 MW-2 12/18/1997 34.80450 77.54407 Surficial Aquifer 15.0 5.0-15.0 3.0-15.0 1.5-3.0 2.0
6709-MSWLF-1997 MW-2a 12/18/1997 34.80448 77.54405 Surficial Aquifer 24.0 19.0-24.0 15.0-24.0 12.0-15.0 2.0
6709-MSWLF-1997 MW-3 10/31/1998 34.80252 77.54225 Surficial Aquifer 22.0 7.0-22.0 5.0-22.0 3.0-5.0 2.0
6709-MSWLF-1997 MW-4 10/30/1998 34.80129 77.54389 Surficial Aquifer 14.0 4.0-14.0 3.0-14.0 1.5-3.0 2.0
6709-MSWLF-1997 MW-4a 10/30/1998 34.80127 77.54392 Surficial Aquifer 25.0 20.0-25.0 18.0-25.0 16.0-18.0 2.0
6709-MSWLF-1997 MW-5 10/30/1998 34.80015 77.54700 Surficial Aquifer 22.0 7.0-22.0 5.0-22.0 3.0-5.0 2.0
6709-MSWLF-1997 MW-6 10/30/1998 34.80182 77.54874 Surficial Aquifer 22.0 7.0-22.0 5.0-22.0 3.0-5.0 2.0
6709-MSWLF-1997 MW-7 4/15/2004 34.80222 77.54879 Surficial Aquifer 17.0 7.0-17.0 5.0-17.0 3.0-5.0 2.0
6709-MSWLF-1997 MW-8 5/30/2008 34.80299 77.54958 Surficial Aquifer 15.0 5.0-15.0 3.0-15.0 1.0-3.0 2.0
6709-MSWLF-1997 MW-8a 5/30/2008 34.80297 77.54961 Surficial Aquifer 23.0 18.0-23.0 16.0-25.0 14.0-16.0 2.0
6709-MSWLF-1997 MW-9 12/19/2016 34.80473 77.54981 Surficial Aquifer 15.0 5.0-15.0 3.0-15.0 1.0-3.0 2.0
Notes:
1. TOC - Top of Casing
2. bgs - Below Ground Surface
Facility Permit
Number
Depths (feet bgs)Total Depth
(feet below TOC)
Monitoring Well
Diameter
(inches)
Monitoring
Well Code
Geology of
Screened Interval
Completion
Date Latitude Longitude
Page 1 of 1 November 2017
Table 2
Groundwater Elevations
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit 6709-MSWLF-1997
4/4/2011 11/14/2011 5/8/2012 10/15/2012 4/24/2013 10/23/2013 5/20/2014
6709-MSWLF-1997 MW-1 98.94 96.06 89.94 88.70 87.43 90.03 89.47 87.95 89.79
6709-MSWLF-1997 MW-1a 98.65 95.99 88.86 87.90 86.56 88.91 88.58 87.03 88.79
6709-MSWLF-1997 MW-2 95.39 92.75 85.38 83.65 82.64 84.99 84.43 82.79 84.60
6709-MSWLF-1997 MW-2a 95.40 92.81 84.94 83.33 82.37 84.59 84.10 82.49 84.26
6709-MSWLF-1997 MW-3 99.51 96.62 85.60 84.69 84.06 85.82 85.08 84.25 85.57
6709-MSWLF-1997 MW-4 94.40 92.30 87.63 86.73 86.98 87.46 87.63 87.92 87.96
6709-MSWLF-1997 MW-4a 94.54 92.30 80.68 80.12 79.93 80.60 80.36 80.09 80.43
6709-MSWLF-1997 MW-5 86.72 84.42 82.58 81.06 81.99 80.54 82.14 82.80 80.58
6709-MSWLF-1997 MW-6 86.36 83.71 79.80 78.59 79.00 79.20 79.31 78.77 79.31
6709-MSWLF-1997 TW-2 96.39 94.07 --------------
6709-MSWLF-1997 MW-7 86.82 83.94 80.11 79.25 79.25 79.44 79.99 79.17 79.97
6709-MSWLF-1997 MW-8 82.25 79.40 78.23 77.25 77.37 77.84 77.86 77.60 77.86
6709-MSWLF-1997 MW-8a 81.17 79.40 73.52 73.52 73.52 73.52 73.52 73.16 73.31
6709-MSWLF-1997 MW-9 86.74 83.74 --------------
Notes:
1. AMSL - Above Mean Sea Level
2. (--) Water Level Not Collected
3. MW-7 was installed on April 14, 2004.
4. MW-8 and MW-8a were installed on May 30, 2008.
5. MW-9 was installed on December 19, 2016.
Facility Permit Monitoring Well
Code
Ground
Elevation
(AMSL)
TOC
Elevation
(AMSL)
Groundwater Elevations (AMSL)
Page 1 of 2 November 2017
Table 2
Groundwater Elevations
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit 6709-MSWLF-1997
6709-MSWLF-1997 MW-1 98.94 96.06
6709-MSWLF-1997 MW-1a 98.65 95.99
6709-MSWLF-1997 MW-2 95.39 92.75
6709-MSWLF-1997 MW-2a 95.40 92.81
6709-MSWLF-1997 MW-3 99.51 96.62
6709-MSWLF-1997 MW-4 94.40 92.30
6709-MSWLF-1997 MW-4a 94.54 92.30
6709-MSWLF-1997 MW-5 86.72 84.42
6709-MSWLF-1997 MW-6 86.36 83.71
6709-MSWLF-1997 TW-2 96.39 94.07
6709-MSWLF-1997 MW-7 86.82 83.94
6709-MSWLF-1997 MW-8 82.25 79.40
6709-MSWLF-1997 MW-8a 81.17 79.40
6709-MSWLF-1997 MW-9 86.74 83.74
Notes:
1. AMSL - Above Mean Sea Level
2. (--) Water Level Not Collected
3. MW-7 was installed on April 14, 2004.
4. MW-8 and MW-8a were installed on May 30, 2008.
5. MW-9 was installed on December 19, 2016.
Facility Permit Monitoring Well
Code
Ground
Elevation
(AMSL)
TOC
Elevation
(AMSL)12/2/2014 5/19/2015 10/20/2015 5/2/2016 8/29/2016 3/15/2017 10/4/2017
88.75 91.20 90.56 91.31 89.52 89.64 90.13
87.77 89.86 89.23 90.01 88.32 88.73 89.28
84.35 86.29 86.77 85.94 85.31 86.66 86.32
84.09 85.84 86.28 85.51 84.89 86.17 85.84
84.97 86.98 87.30 86.81 86.20 86.40 87.16
88.18 88.64 85.41 90.04 88.19 88.05 87.76
80.29 --80.95 80.97 80.72 80.85 80.87
82.33 81.00 81.23 82.02 80.08 83.07 78.99
79.59 79.75 79.51 79.45 79.15 79.65 78.70
--------------
80.60 81.20 80.27 81.45 80.41 80.97 79.76
78.00 78.19 78.06 78.29 77.84 78.15 77.36
73.31 73.31 73.31 73.31 73.35 73.52 73.18
----------79.49 77.81
Groundwater Elevations (AMSL)
Page 2 of 2 November 2017
Table 3
Summary of Calculated Groundwater Flow Velocities
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
ft/day (cm/s)ft/day ft/day ft/day ft/day ft/day
6709-MSWLF-1997 MW-1 2.12 0.25 0.00364 3.09E-02 0.00363 3.08E-02 0.00303 2.57E-02 0.00396 3.36E-02 0.00364 3.09E-02
7.48E-04
6709-MSWLF-1997 MW-1a 11.16 0.25 0.00496 2.22E-01 0.00499 2.23E-01 0.00454 2.03E-01 0.00509 2.27E-01 0.00512 2.28E-01
3.94E-03
6709-MSWLF-1997 MW-2 10.51 0.25 0.00393 1.65E-01 0.00435 1.83E-01 0.00413 1.74E-01 0.00434 1.83E-01 0.00434 1.83E-01
3.71E-03
6709-MSWLF-1997 MW-2a 9.69 0.25 0.00338 1.31E-01 0.00394 1.53E-01 0.00361 1.40E-01 0.00372 1.44E-01 0.00386 1.50E-01
3.42E-03
6709-MSWLF-1997 MW-3 7.27 0.25 0.00217 6.31E-02 0.00201 5.83E-02 0.00169 4.90E-02 0.00211 6.12E-02 0.00220 6.38E-02
2.57E-03
6709-MSWLF-1997 MW-4 1.70 0.25 0.00104 7.07E-03 0.00089 6.03E-03 0.00020 1.38E-03 0.00116 7.87E-03 0.00083 5.63E-03
5.99E-04
6709-MSWLF-1997 MW-4a 2.20 0.40 0.00368 2.03E-02 0.00350 1.93E-02 0.00299 1.64E-02 0.00374 2.06E-02 0.00370 2.04E-02
7.77E-04
6709-MSWLF-1997 MW-5 0.066 0.25 0.00288 7.57E-04 0.00298 7.86E-04 0.00213 5.59E-04 0.00371 9.76E-04 0.00286 7.54E-04
2.32E-05
6709-MSWLF-1997 MW-6 1.11 0.25 0.00469 2.09E-02 0.00468 2.08E-02 0.00390 1.74E-02 0.00501 2.23E-02 0.00470 2.09E-02
3.93E-04
6709-MSWLF-1997 MW-7 0.416 0.25 0.00482 8.02E-03 0.00463 7.71E-03 0.00401 6.67E-03 0.00519 8.64E-03 0.00465 7.73E-03
1.47E-04
6709-MSWLF-1997 MW-8 5.69 0.25 0.00597 1.36E-01 0.00584 1.33E-01 0.00513 1.17E-01 0.00622 1.42E-01 0.00592 1.35E-01
2.01E-03
6709-MSWLF-1997 MW-8a 0.093 0.25 0.00783 2.91E-03 0.00754 2.81E-03 0.00702 2.61E-03 0.00780 2.90E-03 0.00779 2.90E-03
3.28E-05
6709-MSWLF-1997 MW-9 1.17 0.25 --------------------
4.13E-04
Notes:
1. (--) Water Level Not Collected
2. Hydraulic conductivity and effective porosity values are
estimated from previously performed slug tests and grain size analyses.
3. The gradient and linear velocity values shown for MW-1 are based
on the average of wells MW-2, -3, -4, -5, -6, -7, and -8.
4. The gradient and linear velocity values shown for MW-1a are based
on the average of wells MW-2a, -4a, and -8a.
5. MW-7 was installed on April 14, 2004.
6. MW-8 and MW-8a were installed on May 30, 2008.
7. MW-9 was installed on December 19, 2016.
10/15/2012
No. 31
4/4/2011
No. 28
11/14/2011
No. 29
5/8/2012
No. 30 No. 32
4/24/2013
Average Linear
Velocity
Average Linear
Velocity Gradient
ft/foot
Average Linear
Velocity Gradient
ft/foot
Average Linear
Velocity Gradient
ft/foot
Gradient
ft/foot
Average Linear
Velocity Gradient
ft/foot
Sampling Date:Facility Permit
Number
Monitoring Well
Code Hydraulic
Conductivity Porosity
Event:
Page 1 of 3 November 2017
Table 3
Summary of Calculated Groundwater Flow Velocities
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
ft/day (cm/s)
6709-MSWLF-1997 MW-1 2.12 0.25
7.48E-04
6709-MSWLF-1997 MW-1a 11.16 0.25
3.94E-03
6709-MSWLF-1997 MW-2 10.51 0.25
3.71E-03
6709-MSWLF-1997 MW-2a 9.69 0.25
3.42E-03
6709-MSWLF-1997 MW-3 7.27 0.25
2.57E-03
6709-MSWLF-1997 MW-4 1.70 0.25
5.99E-04
6709-MSWLF-1997 MW-4a 2.20 0.40
7.77E-04
6709-MSWLF-1997 MW-5 0.066 0.25
2.32E-05
6709-MSWLF-1997 MW-6 1.11 0.25
3.93E-04
6709-MSWLF-1997 MW-7 0.416 0.25
1.47E-04
6709-MSWLF-1997 MW-8 5.69 0.25
2.01E-03
6709-MSWLF-1997 MW-8a 0.093 0.25
3.28E-05
6709-MSWLF-1997 MW-9 1.17 0.25
4.13E-04
Notes:
1. (--) Water Level Not Collected
2. Hydraulic conductivity and effective porosity values are
estimated from previously performed slug tests and grain size analyses.
3. The gradient and linear velocity values shown for MW-1 are based
on the average of wells MW-2, -3, -4, -5, -6, -7, and -8.
4. The gradient and linear velocity values shown for MW-1a are based
on the average of wells MW-2a, -4a, and -8a.
5. MW-7 was installed on April 14, 2004.
6. MW-8 and MW-8a were installed on May 30, 2008.
7. MW-9 was installed on December 19, 2016.
Sampling Date:Facility Permit
Number
Monitoring Well
Code Hydraulic
Conductivity Porosity
Event:
12/2/2014
ft/day ft/day ft/day ft/day ft/day
0.00317 2.68E-02 0.00382 3.24E-02 0.00317 2.69E-02 0.00405 3.43E-02 0.00391 3.32E-02
0.00471 2.10E-01 0.00519 2.32E-01 0.00459 2.05E-01 0.00589 2.63E-01 0.00709 3.16E-01
0.00445 1.87E-01 0.00447 1.88E-01 0.00379 1.59E-01 0.00423 1.78E-01 0.00327 1.37E-01
0.00391 1.52E-01 0.00391 1.51E-01 0.00317 1.23E-01 0.00347 1.34E-01 0.00254 9.86E-02
0.00185 5.38E-02 0.00211 6.14E-02 0.00189 5.50E-02 0.00211 6.14E-02 0.00163 4.74E-02
0.00001 9.18E-05 0.00082 5.60E-03 0.00026 1.75E-03 0.00115 7.84E-03 0.00232 1.58E-02
0.00313 1.72E-02 0.00377 2.07E-02 0.00337 1.86E-02 ----0.00373 2.05E-02
0.00201 5.30E-04 0.00360 9.47E-04 0.00251 6.60E-04 0.00398 1.05E-03 0.00364 9.59E-04
0.00425 1.89E-02 0.00485 2.16E-02 0.00424 1.89E-02 0.00530 2.36E-02 0.00512 2.28E-02
0.00430 7.16E-03 0.00481 8.01E-03 0.00400 6.65E-03 0.00490 8.16E-03 0.00504 8.39E-03
0.00528 1.20E-01 0.00609 1.39E-01 0.00548 1.25E-01 0.00664 1.51E-01 0.00638 1.45E-01
0.00708 2.63E-03 0.00790 2.94E-03 0.00723 2.69E-03 0.00832 3.09E-03 0.00790 2.94E-03
--------------------
No. 34
5/20/2014
No. 33
10/23/2013
Average Linear
Velocity Gradient
ft/foot
Average Linear
Velocity
No. 36
5/19/2015
No. 35
Gradient
ft/foot
Average Linear
Velocity Gradient
ft/foot
Average Linear
Velocity Gradient
ft/foot
No. 37
10/20/2015
Gradient
ft/foot
Average Linear
Velocity
Page 2 of 3 November 2017
Table 3
Summary of Calculated Groundwater Flow Velocities
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
ft/day (cm/s)
6709-MSWLF-1997 MW-1 2.12 0.25
7.48E-04
6709-MSWLF-1997 MW-1a 11.16 0.25
3.94E-03
6709-MSWLF-1997 MW-2 10.51 0.25
3.71E-03
6709-MSWLF-1997 MW-2a 9.69 0.25
3.42E-03
6709-MSWLF-1997 MW-3 7.27 0.25
2.57E-03
6709-MSWLF-1997 MW-4 1.70 0.25
5.99E-04
6709-MSWLF-1997 MW-4a 2.20 0.40
7.77E-04
6709-MSWLF-1997 MW-5 0.066 0.25
2.32E-05
6709-MSWLF-1997 MW-6 1.11 0.25
3.93E-04
6709-MSWLF-1997 MW-7 0.416 0.25
1.47E-04
6709-MSWLF-1997 MW-8 5.69 0.25
2.01E-03
6709-MSWLF-1997 MW-8a 0.093 0.25
3.28E-05
6709-MSWLF-1997 MW-9 1.17 0.25
4.13E-04
Notes:
1. (--) Water Level Not Collected
2. Hydraulic conductivity and effective porosity values are
estimated from previously performed slug tests and grain size analyses.
3. The gradient and linear velocity values shown for MW-1 are based
on the average of wells MW-2, -3, -4, -5, -6, -7, and -8.
4. The gradient and linear velocity values shown for MW-1a are based
on the average of wells MW-2a, -4a, and -8a.
5. MW-7 was installed on April 14, 2004.
6. MW-8 and MW-8a were installed on May 30, 2008.
7. MW-9 was installed on December 19, 2016.
Sampling Date:Facility Permit
Number
Monitoring Well
Code Hydraulic
Conductivity Porosity
Event:
ft/day ft/day ft/day ft/day
0.00401 3.40E-02 0.00354 3.00E-02 0.00351 2.97E-02 0.00430 3.65E-02
0.00821 3.66E-01 0.00701 3.13E-01 0.00676 3.02E-01 0.00748 3.34E-01
0.00463 1.95E-01 0.00363 1.53E-01 0.00257 1.08E-01 0.00328 1.38E-01
0.00388 1.50E-01 0.00296 1.15E-01 0.00221 8.55E-02 0.00297 1.15E-01
0.00225 6.54E-02 0.00166 4.83E-02 0.00162 4.71E-02 0.00149 4.32E-02
0.00057 3.89E-03 0.00060 4.07E-03 0.00072 4.87E-03 0.00107 7.26E-03
0.00407 2.24E-02 0.00342 1.89E-02 0.00355 1.96E-02 0.00379 2.09E-02
0.00363 9.55E-04 0.00369 9.71E-04 0.00232 6.11E-04 0.00435 1.15E-03
0.00549 2.44E-02 0.00480 2.14E-02 0.00463 2.06E-02 0.00529 2.36E-02
0.00483 8.04E-03 0.00447 7.43E-03 0.00428 7.12E-03 0.00508 8.46E-03
0.00664 1.51E-01 0.00596 1.36E-01 0.00586 1.33E-01 0.00652 1.48E-01
0.00846 3.15E-03 0.00764 2.84E-03 0.00776 2.89E-03 0.00821 3.06E-03
--------0.00605 2.83E-02 0.00735 3.44E-02
No. 38
5/2/2016
Gradient
ft/foot
Average Linear
Velocity
No. 39
8/29/2016
Gradient
ft/foot
Average Linear
Velocity
No. 41
10/4/2017
Gradient
ft/foot
Average Linear
Velocity
No. 40
3/15/2017
Gradient
ft/foot
Average Linear
Velocity
Page 3 of 3 November 2017
Table 4
Water Quality Measurements
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Facility Permit Monitoring Well pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP
Number Code ( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)
6709-MSWLF-1997 MW-1 4.27 39 14.3 9.86 223 186.1 4.45 38 19.7 7.03 428 143.6 4.53 24 17.2 5.51 48 183.2 4.38 39 21.4 6.88 255 350.4
6709-MSWLF-1997 MW-1a 4.25 46 17.0 1.07 17 38.7 4.49 46 18.8 0.86 6 140.7 4.68 30 17.8 1.13 19 180.1 4.44 49 19.0 0.68 8 161.2
6709-MSWLF-1997 MW-2 5.47 816 15.7 2.21 48 -48.4 5.78 569 20.6 2.60 19 54.1 5.41 628 17.5 2.48 40 101.8 5.65 558 22.3 1.58 10 -41.1
6709-MSWLF-1997 MW-2a 5.41 498 16.8 1.33 67 14.9 5.65 211 20.1 2.11 47 80.3 5.25 176 17.6 1.59 22 161.8 5.43 218 20.8 0.73 17 61.4
6709-MSWLF-1997 MW-3 4.93 57 15.5 9.38 72 131.2 5.38 65 20.7 8.11 48 117.8 6.44 48 17.5 8.22 52 119.4 4.77 66 22.4 6.99 684 221.3
6709-MSWLF-1997 MW-4 5.52 211 14.0 3.69 316 -4.6 5.29 262 20.8 2.61 96 112.2 5.72 106 18.0 3.02 238 97.6 5.68 161 23.3 1.88 310 -28.7
6709-MSWLF-1997 MW-4a ------------------------------------------------
6709-MSWLF-1997 MW-5 4.89 193 15.1 4.34 36 109.9 5.24 185 20.2 3.11 37 116.9 5.11 138 17.0 2.77 47 124.2 4.81 177 21.2 20.90 26 198.5
6709-MSWLF-1997 MW-6 5.48 258 14.7 1.73 46 -119.7 5.62 205 19.8 5.16 17 79.3 5.31 144 16.5 1.66 508 111.2 5.37 169 20.8 1.65 432 -42.2
6709-MSWLF-1997 TW-2 ------------------------------------------------
6709-MSWLF-1997 MW-7 4.39 135 15.2 4.92 58 -89.2 4.94 127 20.3 5.31 53 111.6 5.02 96 17.2 1.53 448 79.3 4.64 119 21.7 1.68 44 21.9
6709-MSWLF-1997 MW-8 4.62 103 15.0 2.55 36 -116.3 5.17 103 20.0 5.77 11 81.2 5.17 67 16.8 2.11 38 148.9 4.82 124 20.5 2.08 10 -23.3
6709-MSWLF-1997 MW-8a 4.80 53 16.8 4.26 63 -2.0 5.36 62 18.5 3.82 21 100.6 5.39 39 17.3 2.54 26 202.4 5.10 58 18.4 2.62 22 59.8
6709-MSWLF-1997 MW-9 ------------------------------------------------
Notes:
1. (--) Not Sampled
2. MW-7 was installed on April 14, 2004.
3. MW-8 and MW-8a were installed on May 30, 2008.
4. MW-9 was installed on December 19, 2016.
5. µS/cm - Microsiemens per centimeter
6. DO - Dissolved Oxygen (mg/L - milligrams per liter)
7. ORP - Oxidation Reduction Potential (mV - millivolt)
8. NTU - Nephelometric Turbidity Units
9. Turbidity recorded at time of sampling.
11/14-15/2011
No. 29
4/4-5/2011
No. 30Event:
Sampling Date:
No. 28 No. 31
10/15-16/20125/8-9/2012
Page 1 of 4 November 2017
Table 4
Water Quality Measurements
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Facility Permit Monitoring Well
Number Code
6709-MSWLF-1997 MW-1
6709-MSWLF-1997 MW-1a
6709-MSWLF-1997 MW-2
6709-MSWLF-1997 MW-2a
6709-MSWLF-1997 MW-3
6709-MSWLF-1997 MW-4
6709-MSWLF-1997 MW-4a
6709-MSWLF-1997 MW-5
6709-MSWLF-1997 MW-6
6709-MSWLF-1997 TW-2
6709-MSWLF-1997 MW-7
6709-MSWLF-1997 MW-8
6709-MSWLF-1997 MW-8a
6709-MSWLF-1997 MW-9
Event:
Sampling Date:
pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP
( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)
4.38 46 15.4 7.42 442 73.2 4.41 52 20.4 5.04 745 181.1 4.61 49 15.6 6.88 > 1,000 166.2 4.70 59 18.2 4.43 120 248.1
4.88 54 17.1 1.16 12 41.3 4.27 37 18.6 3.08 88 126.7 4.82 42 15.3 0.87 19 156.7 4.76 55 18.1 2.23 100 119.8
5.59 680 16.2 2.74 30 19.1 5.69 718 20.9 2.27 15 -18.3 5.83 568 15.3 2.48 33 72.3 5.88 563 19.6 2.05 8 -15.0
5.38 255 17.4 1.62 49 13.1 5.09 119 19.9 2.18 84 104.6 5.41 272 15.2 0.94 49 81.9 5.45 258 19.7 1.85 77 62.1
5.41 74 16.3 8.38 643 40.4 5.54 73 20.8 7.41 418 122.3 5.47 89 15.1 8.11 913 153.1 5.83 104 19.3 7.19 97 150.1
5.64 168 15.0 2.02 393 22.1 6.13 183 22.4 1.88 126 -67.4 6.11 173 15.9 2.44 245 103.8 6.18 223 18.4 1.60 22 39.5
------------------------------------------------
5.36 171 15.8 1.48 72 51.7 5.22 163 21.0 2.76 6 125.5 5.63 169 14.5 2.37 61 133.1 5.31 151 18.9 2.68 39 121.5
5.65 239 15.0 2.09 121 3.7 5.93 272 20.5 2.01 468 -78.4 5.72 215 13.8 1.81 783 49.1 5.88 232 18.5 2.45 64 -32.6
------------------------------------------------
4.78 129 15.7 2.28 503 18.3 4.93 128 21.3 1.94 241 -54.1 4.98 142 14.9 2.10 394 79.7 4.87 128 18.7 2.15 77 -0.3
4.83 161 14.8 2.98 24 -10.6 4.98 134 19.5 2.63 46 -88.4 4.88 241 13.5 3.31 26 47.4 4.97 250 18.0 2.44 24 -40.7
5.27 55 16.3 3.44 41 -1.5 5.07 58 17.7 3.21 16 -50.1 5.19 62 14.2 3.97 18 46.1 5.16 62 17.6 3.02 36 6.0
------------------------------------------------
Notes:
1. (--) Not Sampled
2. MW-7 was installed on April 14, 2004.
3. MW-8 and MW-8a were installed on May 30, 2008.
4. MW-9 was installed on December 19, 2016.
5. µS/cm - Microsiemens per centimeter
6. DO - Dissolved Oxygen (mg/L - milligrams per liter)
7. ORP - Oxidation Reduction Potential (mV - millivolt)
8. NTU - Nephelometric Turbidity Units
9. Turbidity recorded at time of sampling.
No. 32
10/23-24/2013
No. 34 No. 35
4/24-25/2013 12/2-3/2014
No. 33
5/20-21/2014
Page 2 of 4 November 2017
Table 4
Water Quality Measurements
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Facility Permit Monitoring Well
Number Code
6709-MSWLF-1997 MW-1
6709-MSWLF-1997 MW-1a
6709-MSWLF-1997 MW-2
6709-MSWLF-1997 MW-2a
6709-MSWLF-1997 MW-3
6709-MSWLF-1997 MW-4
6709-MSWLF-1997 MW-4a
6709-MSWLF-1997 MW-5
6709-MSWLF-1997 MW-6
6709-MSWLF-1997 TW-2
6709-MSWLF-1997 MW-7
6709-MSWLF-1997 MW-8
6709-MSWLF-1997 MW-8a
6709-MSWLF-1997 MW-9
Event:
Sampling Date:
pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP
( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)
4.85 30 17.7 7.90 199 34.1 4.65 36 20.7 6.50 73 180.0 4.97 59 15.8 6.23 18 118.0
5.38 36 17.0 1.71 27 -56.3 4.95 42 18.1 0.56 5 155.9 5.23 54 16.1 1.46 74 31.2
6.36 517 17.3 4.01 35 -115.0 5.85 389 22.5 2.07 8 4.3 5.97 1,386 16.0 1.57 24 18.2
6.15 377 17.0 1.96 9 -89.2 5.58 363 20.5 0.63 11 42.4 5.73 732 16.2 1.03 84 43.5
6.14 85 17.7 8.21 301 -43.5 5.75 88 22.3 6.20 8 111.3 5.83 141 15.9 5.96 22 103.7
6.74 196 18.4 3.73 271 -98.2 6.20 227 22.8 1.68 32 40.1 6.13 289 16.9 1.68 128 49.3
------------------------------------
5.72 139 16.9 5.32 6 -18.2 5.35 122 21.0 2.14 4 110.3 5.40 157 16.1 2.78 7 67.3
6.50 221 16.0 2.84 39 -140.2 6.00 214 20.5 1.71 54 2.2 5.84 231 16.3 2.00 45 -17.5
------------------------------------
5.32 140 17.1 3.46 165 -98.0 4.89 127 21.1 1.21 37 79.5 4.89 171 16.4 2.65 17 10.7
5.61 284 15.9 4.44 50 -126.4 5.16 248 19.3 1.46 5 50.9 5.28 518 15.2 2.66 97 -19.1
5.58 60 16.7 3.97 20 -87.0 5.19 54 17.4 2.02 6 72.4 5.18 91 16.1 1.53 6 48.5
------------------------------------
Notes:
1. (--) Not Sampled
2. MW-7 was installed on April 14, 2004.
3. MW-8 and MW-8a were installed on May 30, 2008.
4. MW-9 was installed on December 19, 2016.
5. µS/cm - Microsiemens per centimeter
6. DO - Dissolved Oxygen (mg/L - milligrams per liter)
7. ORP - Oxidation Reduction Potential (mV - millivolt)
8. NTU - Nephelometric Turbidity Units
9. Turbidity recorded at time of sampling.
10/20-21/2015
No. 38
5/19-20/2015 5/2-3/2016
No. 37No. 36
Page 3 of 4 November 2017
Table 4
Water Quality Measurements
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Facility Permit Monitoring Well
Number Code
6709-MSWLF-1997 MW-1
6709-MSWLF-1997 MW-1a
6709-MSWLF-1997 MW-2
6709-MSWLF-1997 MW-2a
6709-MSWLF-1997 MW-3
6709-MSWLF-1997 MW-4
6709-MSWLF-1997 MW-4a
6709-MSWLF-1997 MW-5
6709-MSWLF-1997 MW-6
6709-MSWLF-1997 TW-2
6709-MSWLF-1997 MW-7
6709-MSWLF-1997 MW-8
6709-MSWLF-1997 MW-8a
6709-MSWLF-1997 MW-9
Event:
Sampling Date:
pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP pH Conductivity Temp.DO Turbidity ORP
( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)( - )(µS/cm)(deg. C)(mg/L)(NTU)(mV)
4.14 44 22.9 5.44 50 96.5 4.81 37 14.1 6.36 44 142.1 4.31 38 22.2 6.41 6 187.6
4.35 34 18.9 1.39 16 65.4 5.14 31 15.7 2.15 15 117.2 4.99 47 19.2 1.08 5 129.8
6.06 1,003 24.4 1.29 12 -46.7 5.95 787 15.9 2.18 29 76.8 5.77 1,020 23.1 1.00 2 24.3
5.60 568 21.3 1.89 21 24.0 5.85 690 15.3 2.25 47 86.3 5.64 845 21.2 0.82 8 25.3
5.66 127 23.4 5.16 28 37.5 5.79 67 15.9 5.80 1,000 79.0 5.50 110 23.0 5.03 7 201.6
6.41 300 25.8 1.11 32 -90.7 5.91 235 14.7 1.74 56 113.2 6.03 593 23.8 1.12 6 26.6
------------------------------------
4.36 130 22.0 1.85 8 99.9 5.51 90 16.0 3.29 18 119.9 5.20 153 22.2 1.65 9 131.4
5.37 172 21.5 2.01 46 -32.4 5.81 140 15.5 2.44 98 80.9 5.73 183 20.9 1.16 19 38.3
------------------------------------
4.47 146 21.8 1.57 11 26.0 5.27 177 15.7 2.10 464 101.4 4.73 161 21.1 1.10 10 101.6
5.00 333 20.1 2.11 15 4.1 5.42 171 15.0 1.93 34 82.7 5.09 198 20.2 0.95 27 68.7
4.37 58 19.0 2.34 9 61.1 5.25 67 16.4 3.02 18 63.4 4.92 76 20.6 1.63 10 108.5
------------5.07 53 15.6 1.63 562 123.1 4.96 53 20.7 1.44 305 128.4
Notes:
1. (--) Not Sampled
2. MW-7 was installed on April 14, 2004.
3. MW-8 and MW-8a were installed on May 30, 2008.
4. MW-9 was installed on December 19, 2016.
5. µS/cm - Microsiemens per centimeter
6. DO - Dissolved Oxygen (mg/L - milligrams per liter)
7. ORP - Oxidation Reduction Potential (mV - millivolt)
8. NTU - Nephelometric Turbidity Units
9. Turbidity recorded at time of sampling.
No. 41
10/4-5/2017
No. 40
3/15-16/2017
No. 39
8/29-30/2016
Page 4 of 4 November 2017
Table 5a
Detected Groundwater Constituents - Metals
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Monitoring Well CodeSample DateAntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadNickelSeleniumSilverThalliumVanadiumZinc1*10 700 4*2 10 1*1,000 15 100 20 20 0.2*0.3*1,000
6 10 100 1 1 10 10 10 10 50 10 10 5.5 25 10
MW-1 5-Apr-11 29.8J 0.321J 23.9 1.58J 5.81J 7.73J 5.14J 3.45J 22.2J 53.6
MW-1 15-Nov-11 42.4J 0.288J 37.2 1.90J 8.33J 14.5 7.07J 2.01J 37.2 23.8
MW-1 9-May-12 16.0J 3.43J 1.69J 2.48J 0.50J 49.4 3.10J
MW-1 16-Oct-12 14.2J 0.040J 23.2 4.09J 10.1 6.10 9.27J
MW-1 25-Apr-13 2.2R 12R 8.8R 0.24J 2.8J 4.3R 1.2J 0.21J 0.041J 11R 8.6J
MW-1 24-Oct-13 0.43J 3.5R 19R 0.35J 0.18J 15 0.50J 5.1R 9.1R 1.2J 1.1R 0.16J 0.33J 19R 12
MW-1 21-May-14 6.22J 52.9J 0.421J 72.7 3.82J 16.7 27.5 11.8J 71.50 35.3
MW-1 2-Dec-14 0.366J 14.3J 2.42 1.07J 1.60J
MW-1 20-May-15 0.654J 11.1J 5.28J 5.24J 5.78J
MW-1 21-Oct-15 3.25J 14.4J 5.37J 3.52J 0.968J 3.86J 7.33J
MW-1 3-May-16 7.07J 2.27J 7.44JD 3.26J 25.4
MW-1 30-Aug-16 9.90J 3.14J 22.2
MW-1 (dissolved)30-Aug-16 9.22J 4.20J 4.85J
MW-1 16-Mar-17 12.7J 0.522J 2.94J 2.99J 3.66J 0.282J 3.08J
MW-1 5-Oct-17 6.01J 0.197J 3.78J 2.77J 0.613J
MW-1a 4-Apr-11 0.328J 20.9J 2.74J 1.28J 2.73J 2.15J 5.52J 11.8J 14.3
MW-1a 14-Nov-11 0.255J 13.9J 1.51J 1.91J 2.49J 5.43J 12.1
MW-1a 8-May-12 9.36J 1.60J 3.50J 2.47J 0.140J 12.1 8.00J
MW-1a 15-Oct-12 12.9J 0.16J 1.02J 3.50J 2.40J 19.9
MW-1a 24-Apr-13 0.67J 2.4R 7.8R 1.6R 0.16J 0.94J 1.4R 0.64J 1.6R 9.1R 6.7J
MW-1a 24-Oct-13 0.16J 0.68J 7.5R 0.040J 0.87J 0.54J 1.7R 0.73J 0.52J 2.6J 13
MW-1a 20-May-14 0.890J 8.97J 2.85J 1.73J 7.25J 16.1J 9.66J
MW-1a 2-Dec-14 0.768J 15.9J 4.88J 1.72J 2.50J 3.11J 2.62J 4.94J 6.51J
MW-1a 20-May-15 0.705J 4.18J 2.48J 1.47J 9.50J 12.7
MW-1a 20-Oct-15 1.18J 23.2J 4.94J 3.97J 2.29J 0.968J 2.96J 9.87J
MW-1a 3-May-16 7.95J 4.29J 3.46J 11.4D 6.24J 6.44J
MW-1a dup 3-May-16 8.41J 6.05J 2.10J 2.74J 6.15J
MW-1a 30-Aug-16 0.360J 14.1J 7.00J 4.16J 3.65J 30.0
MW-1a (dissolved)30-Aug-16 15.1J 1.60J 9.85J
MW-1a 16-Mar-17 9.17J 0.559J 2.16J 3.75J 0.294J 4.82J
MW-1a 4-Oct-17 5.00J 0.186J 3.56J 2.73J 0.584J 2.77J
MW-2 4-Apr-11 21.5J 3.84J 2.74J 3.29J 11.7 0.363J 11.4J
MW-2 14-Nov-11 12.9 16.7J 1.81J 3.33J 1.58J 0.199J 5.95J
MW-2 8-May-12 3.81J 21.7J 7.95J 5.75J 15.1 3.64J 0.220J 17.0 16.8
MW-2 15-Oct-12 8.22J 0.080J 4.06J 4.32J 3.30J 3.50J 5.2 7.26J
MW-2 dup 15-Oct-12 9.84J 0.080J 3.21J 4.47J 12.1 2.20J 4.31J 4.60J 8.35J
MW-2 24-Apr-13 6.1R 10R 0.14J 2.1R 1.0R 2.3J 9.2R 0.84J 1.8R 0.063J 0.32J 7.8R 7.2J
MW-2 23-Oct-13 0.51J 14 21R 0.093J 0.21J 3.2R 2.9R 1.5J 3.3R 1.4R 0.10J 0.29J 8.8R 14
MW-2 20-May-14 0.220J 10.3J 2.65J 10.0 6.25J 6.87J
MW-2 dup 20-May-14 10.3J 2.47J 8.90J 5.18J 5.05J
MW-2 2-Dec-14 0.241J 7.70J 11.3J 1.64J 3.91J
MW-2 20-May-15 10.4J 1.78J 1.98J 2.25J 8.82J
MW-2 21-Oct-15 0.476J 3.02J 3.93J 1.97J
MW-2 3-May-16 12.8 46.5J 3.58J 2.04J 4.33J 7.26JD 10.1J 5.91J
MW-2 29-Aug-16 16.4 28.0J 3.83J 1.28J 2.84J 0.126J 9.13J 13.0
MW-2 (dissolved)29-Aug-16 8.77J 23.4J 2.52J 1.73J
MW-2 16-Mar-17 9.78J 36.0J 4.59J 3.06J 0.254J 11.4J
MW-2 4-Oct-17 30.7J 2.57J 1.20J 2.79J 0.452J 7.78J
MW-2a 4-Apr-11 0.339J 79.4 12.7J 4.52J 2.58J 2.72J 12.6 0.374J 21.1J 12.5
MW-2a 14-Nov-11 11.5 10.3J 5.33J 1.52J 3.60J 6.09J 7.67J 7.22J
MW-2a 9-May-12 6.84J 4.66J 2.26J 1.36J 1.92J 0.160J 16.2 5.71J
MW-2a 15-Oct-12 15.5 11.9J 0.20J 2.19J 9.05J 3.70J 3.78J 3.40J 17.8
MW-2a 24-Apr-12 0.55J 240 5.3R 5.5R 0.95J 1.3J 5.3R 1.7J 1.7R 0.025J 31 5.8J
MW-2a 23-Oct-13 0.16J 18 7.2R 2.3R 0.70J 5.2R 5.3R 0.65J 1.5R 0.037J 0.033J 4.2J 12
MW-2a dup 23-Oct-13 0.21J 30 7.3R 0.061J 2.4R 0.72J 5.0R 5.8R 0.53J 1.3R 0.043J 0.054J 5.6R 14
MW-2a 20-May-14 0.539J 406 10.9J 5.24J 1.82J 10.6 2.12J 69.5 8.07J
MW-2a 2-Dec-14 31 14.1J 3.02J 2.50J 6.75J 5.73J
MW-2a 20-May-15 0.355J 255 23.2J 6.29J 2.59J 8.73J 61.7 7.40J
MW-2a dup 20-May-15 0.422J 261 23.4J 6.22J 2.43J 9.40J 59.8 9.83
MW-2a 21-Oct-15 0.254J 34.1 20.3J 2.70J 1.95J 4.28J 2.53J 4.70J 13.7
MW-2a 3-May-16 71.0 23.5J 7.02J 3.33J 18.6 5.29JD 14.2J 9.44J
MW-2a 30-Aug-16 26.5 28.6J 1.98J 1.94J 2.40J 0.163J 2.92J 16.9
MW-2a (dissolved)30-Aug-16 21.0 30.3J 1.73J 1.56J 0.141J 2.79J
MW-2a dup 30-Aug-16 25.0 28.9J 1.76J 2.31J 0.171J 2.98J 15.9
MW-2a dup (dissolved)30-Aug-16 22.0 28.7J 1.71J 1.45J 0.133J 2.84J
MW-2a 16-Mar-17 37.2 56.2J 0.195J 0.520J 13.2 2.49J 3.55J 28.5 4.66J 0.460J 18.8J 10.1
MW-2a 4-Oct-17 36.9 28.3J 0.216J 3.01J 25.2 4.17J 3.32J 10.6J
North Carolina 2L or Groundwater
Protection Standard
Solid Waste Section Limit
Page 1 of 7 November 2017
Table 5a
Detected Groundwater Constituents - Metals
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Monitoring Well CodeSample DateAntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadNickelSeleniumSilverThalliumVanadiumZinc1*10 700 4*2 10 1*1,000 15 100 20 20 0.2*0.3*1,000
6 10 100 1 1 10 10 10 10 50 10 10 5.5 25 10
North Carolina 2L or Groundwater
Protection Standard
Solid Waste Section Limit
MW-3 5-Apr-11 6.29J 5.79J 1.26J 2.55J 2.16J 3.27J 12.1J 12.5
MW-3 15-Nov-11 7.60J 6.82J 1.15J 2.73J 3.66J 2.49J 12.5J 11.3
MW-3 dup 15-Nov-11 5.82J 4.39J 2.55J 2.54J 2.24J 7.98J 10.7
MW-3 9-May-12 11.6J 9.03J 3.85J 3.39J 2.67J 0.180J 48.2 9.77J
MW-3 16-Oct-12 3.93J 7.66J 0.040J 39.4 18.1 17.2 11.8J 5.9J 43.2
MW-3 25-Apr-13 3.3R 5.0R 0.039J 9.7R 2.0R 7.8R 5.2R 4.1R 2.1R 0.037J 0.13J 14R 21
MW-3 24-Oct-13 0.23J 1.9J 0.048J 1.3R 0.43J 1.5J 1.0R 0.84J 1.2R 2.9J 13
MW-3 21-May-14 32.7 46.6J 0.841J 82.2 13.8 37.3 30.2 33.3J 3.74J 169 105
MW-3 2-Dec-14 2.10J
MW-3 20-May-15 8.18J 9.90J 2.06J 3.70J 2.86J 22.9J 12.5
MW-3 21-Oct-15 1.30J 2.47J 0.944J 3.85J
MW-3 3-May-16 1.95J 7.18JD 2.18J 18.8
MW-3 30-Aug-16 23.6J 3.34J 1.11J 1.56J 11.6
MW-3 (dissolved)30-Aug-16 2.10J
MW-3 16-Mar-17 16.0 63.4J 0.982J 0.614J 59.5 7.89J 18.3 21.3 21.5J 2.10J 0.307J 92.3 69.2
MW-3 5-Oct-17 1.21J 0.236J 3.43J 3.26J 1.12J 0.498J 8.35J
MW-4 5-Apr-11 0.316J 14.5J 6.25J 3.23J 2.96J 18.3J 18.8
MW-4 dup 5-Apr-11 0.296J 16.2J 7.62J 3.08J 3.28J 3.42J 18.2J 9.38J
MW-4 15-Nov-11 31.5J 0.151J 6.03J 1.74J 2.63J 4.06J 2.41J 8.80J 5.96J
MW-4 9-May-12 14.9J 7.73J 4.47J 2.51J 0.60J 48.9 5.61J
MW-4 16-Oct-12 0.06J 2.99J 6.67J 12.7 2.89J
MW-4 25-Apr-13 1.5R 11R 0.070J 4.2R 0.77J 3.1J 6.2R 1.6J 1.0R 12R 13
MW-4 24-Oct-13 0.35J 1.3R 5.9R 1.4R 0.20J 1.6J 2.0R 0.31J 0.55J 12R 19
MW-4 21-May-14 0.232J 23.1J 0.194J 17.4 2.25J 6.21J 10.6 3.00J 1.59J 22.1J 22.5
MW-4 2-Dec-14 0.274J 8.82J 6.95J
MW-4 20-May-15 13.5J 4.93J 3.15J 20.5J 8.24J
MW-4 21-Oct-15 0.454J 6.79J 16.3J 4.39J
MW-4 3-May-16 11.7J 4.81J 2.26J 9.26JD 9.76J 4.48J
MW-4 30-Aug-16 7.14J 1.51J 3.23J 3.63J 19.5
MW-4 (dissolved)30-Aug-16 6.83J 6.95J 3.49J
MW-4 16-Mar-17 9.11J 11.2J 1.62J 3.92J 0.194J 4.11J
MW-4 4-Oct-17 17.2J 3.25J 2.77J 0.503J 1.54J
MW-5 4-Apr-11 56.4J 0.546J 9.99J
MW-5 14-Nov-11 12.1 56.5J 0.104J 1.37J 3.88J 13.6J 10.2
MW-5 8-May-12 63.2J 2.71J 3.04J 0.220J 26 14.6
MW-5 15-Oct-12 74.7J 0.140J 1.65J 6.90J 3.86J 3.41J 4.60J 22.6
MW-5 24-Apr-13 26 58R 0.18J 1.4R 2.6R 5.2R 11 3.4R 0.65J 0.022J 34 16
MW-5 dup 24-Apr-13 23 59R 0.24J 0.12J 1.2R 2.8R 5.2R 10 3.7R 0.54J 0.071J 0.21J 30 17
MW-5 23-Oct-13 0.12J 1.4R 30R 0.045J 0.057J 0.57J 0.93J 1.3R 0.83J 0.26J 0.067J 2.2J 17
MW-5 20-May-14 6.65J 63.0J 0.109J 2.70J 2.54J 5.01J 2.25J 5.96J 11.8
MW-5 2-Dec-14 14.8 40.5J 4.55J 5.16J 7.72J 7.69J
MW-5 dup 2-Dec-14 14.1 38.3J 0.136J 1.54J 2.05J 2.97J 9.04J 6.93J
MW-5 20-May-15 37.7J 0.111J 13.8
MW-5 21-Oct-15 26.9J 0.387J 9.29J
MW-5 dup 21-Oct-15 12.0 26.4J 8.41J 12.0
MW-5 3-May-16 28.8J 8.27JD 1.50J 13.7
MW-5 30-Aug-16 13.8 25.0J 3.01J 0.146J 9.59J 15.0
MW-5 (dissolved)30-Aug-16 31.3J 0.209J 5.30J
MW-5 16-Mar-17 33.3J 3.20J 0.383J 3.15J 6.47J
MW-5 4-Oct-17 44.1J 0.242J 3.11J 2.22J 4.38J 4.93J 4.53J 0.768J 6.78J 11.4
MW-5 dup 4-Oct-17 43.9J 0.125J 1.50J 3.74J 3.95J 0.693J 2.52J 7.50J
MW-6 5-Apr-11 11.0J 1.75J 0.286J 3.61J 11.6
MW-6 15-Nov-11 23.6J 2.52J 1.27J 2.20J 4.79J 4.12J
MW-6 9-May-12 14.8 37.3J 30.6 11.8 10.2 23.3 20.6J 3.20J 2.74J 1.00J 119 31.0
MW-6 16-Oct-12 12.9 20.0J 0.080J 21.5 9.20J 5.64J 18.1 13.9J 5.60 8.40 28.1
MW-6 25-Apr-13 2.4R 13R 1.4R 0.47J 1.0J 1.0R 1.5J 3.6R 0.025J 5.0J 8.9J
MW-6 24-Oct-13 0.23J 3.7R 12R 0.056J 0.083J 2.7R 1.0R 1.1J 3.2R 1.2J 1.0R 0.040J 0.039J 8.3R 17
MW-6 21-May-14 27.1 49.6J 0.735J 50.7 36.8 12.6 27.1 44.7J 69.60 104
MW-6 2-Dec-14 15.2J 2.78J 4.13J 4.54J
MW-6 20-May-15 14.6J 1.54J 1.10J 3.59J
MW-6 21-Oct-15 14.6J 2.48J 2.01J 6.41J 9.95J
MW-6 3-May-16 12.4J 2.48J 4.27J 2.31J 8.39JD 4.66J 407
MW-6 30-Aug-16 18.5J 1.66J 1.97J 3.40J 13.2
MW-6 (dissolved)30-Aug-16 18.1J 2.50J
MW-6 16-Mar-17 8.98J 16.9J 0.123J 5.89J 2.09J 5.06J 0.334J 9.74J 11.6
MW-6 dup 16-Mar-17 12.9 3.18J 3.51J 0.290J 5.73J 7.84J
MW-6 5-Oct-17 19.9J 0.225J 3.04J 2.71J 3.59J 4.69J 0.662J 7.31J 12.1
MW-6 (dissolved)5-Oct-17 NA NA NA NA NA NA 1.48J NA NA NA NA NA 0.569J 2.75J NA
Page 2 of 7 November 2017
Table 5a
Detected Groundwater Constituents - Metals
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Monitoring Well CodeSample DateAntimonyArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadNickelSeleniumSilverThalliumVanadiumZinc1*10 700 4*2 10 1*1,000 15 100 20 20 0.2*0.3*1,000
6 10 100 1 1 10 10 10 10 50 10 10 5.5 25 10
North Carolina 2L or Groundwater
Protection Standard
Solid Waste Section Limit
MW-7 5-Apr-11 2.95J 28.7J 1.94J 2.41J 0.494J 4.62J 85.9
MW-7 15-Nov-11 30.0J 2.93J 4.46J 3.00J 4.00J 0.899J 0.219J 5.92J 20.3
MW-7 9-May-12 6.33J 39.1J 16.6 6.46J 5.03J 12.5 11.8J 4.00J 2.22J 1.20J 17.3 64.7
MW-7 dup 9-May-12 5.72J 38.9J 15.8 7.48J 5.26J 11.6 10.9J 5.90 2.64J 0.90J 54.0 67.0
MW-7 16-Oct-12 2.00J 9.66J 0.040J 2.99J 10.6 8.00 3.60J 30.1
MW-7 25-Apr-13 9.0R 30R 0.18J 0.082J 3.5R 2.9R 1.4J 7.0R 3.6R 8.8R 1.0R 13R 66
MW-7 24-Oct-13 0.33J 2.6R 22R 0.11J 0.12J 0.82J 0.95J 1.1R 1.3J 3.0R 0.074J 0.24J 4.5J 25
MW-7 21-May-14 12.9 41.2J 0.166J 11.8 7.24J 2.03J 5.70J 6.45J 18.5J 33
MW-7 2-Dec-14 32.4J 4.20J 2.88J 5.02J
MW-7 20-May-15 7.48J 43.8J 8.07J 4.21J 3.36J 0.286J 13.1J 14.8
MW-7 21-Oct-15 8.67J 31.7J 3.46J 3.21J 2.80J 0.244J 9.43J 13.5
MW-7 3-May-16 34.6J 1.84J 7.53JD 4.31J 12.7
MW-7 30-Aug-16 0.591J 45.8J 3.57J 4.38J 0.278J 3.54J 19.3
MW-7 (dissolved)30-Aug-16 7.59J 31.3J 1.03J 1.90J 3.00J 0.214J 3.52J 4.98J
MW-7 16-Mar-17 15.5 77.6J 0.473J 24.7 6.02J 7.75J 10.9J 0.799J 37.1 28.2
MW-7 5-Oct-17 38.6J 0.237J 2.29J 2.01J 3.26J 0.777J 4.05J
MW-8 5-Apr-11 3.85J 66.1J 0.130J 1.12J 3.42J 0.330J 2.44J 140
MW-8 15-Nov-11 63.6J 0.109J
MW-8 9-May-12 51.3J 1.67J 2.10J 2.69J 32.1 12.6
MW-8 16-Oct-12 52.8J 0.020J 6.43J 6.00J 4.25J 6.46J
MW-8 25-Apr-13 4.2R 89R 0.22J 0.11J 0.90J 0.22J 0.64J 3.4R 1.6J 18 0.028J 3.9J 58
MW-8 23-Oct-13 1.3R 65R 0.11J 0.40J 0.07J 0.35J 0.50J 1.2R 2.8J 23
MW-8 21-May-14 117 0.207J 2.45J 3.07J 27.3
MW-8 21-May-14 127 0.189J
MW-8 20-May-15 141 0.116J 1.15J 3.45J 21.3
MW-8 21-Oct-15 99.0J 2.91J 11.5
MW-8 3-May-16 12.7 170 0.124J 2.36J 3.24J 4.75J 9.84JD 4.76J 50.7
MW-8 30-Aug-16 9.42J 138 2.69J 3.12J 2.45J 4.47J 6.16J 49.3
MW-8 (dissolved)30-Aug-16 110 3.20J 5.78J
MW-8 16-Mar-17 9.81J 94.8J 0.184J 0.469J 4.86J 2.90J 3.15J 6.24J 0.757J 0.337J 7.38J 41.4
MW-8 5-Oct-17 0.856J 7.49J 70.7J 0.328J 1.53J 1.34J 4.36J 4.29J 0.694J 1.71J 42.2
MW-8 (dissolved)5-Oct-17 NA NA NA NA NA NA NA NA NA NA NA 0.626J NA
MW-8a 5-Apr-11 43.8J 0.282J 3.69J 4.05J 0.198J 6.47J 15.4
MW-8a 15-Nov-11 40.5J 0.233J 2.23J 8.12J 5.52J
MW-8a 9-May-12 40.5J 1.47J 1.20J 1.98J 33.4 4.39J
MW-8a 16-Oct-12 24.2J 0.040J 8.30J 1.60J 4.90J 3.07J
MW-8a 25-Apr-13 1.2R 40R 0.25J 1.2R 0.52J 1.3J 0.50J 1.7J 1.2R 5.1R 11
MW-8a 24-Oct-13 0.18J 1.8R 32R 0.23J 0.31J 0.65J 0.25J 0.26J 1.3J 0.49J 0.053J 0.072J 8.9R 13
MW-8a 21-May-14 44.2J 24.8 3.92J 5.78J 20.5
MW-8a 2-Dec-14 54.9J 0.332J 5.32J 4.39J
MW-8a 20-May-15 51.8J 0.217J 1.55J 5.79J
MW-8a 21-Oct-15 41.7J 0.219J 6.02J
MW-8a 3-May-16 61.4J 0.174J 1.53J 6.90JD 5.24J
MW-8a 30-Aug-16 69.0J 0.244J 2.06J 3.55J 17.8
MW-8a (dissolved)30-Aug-16 57.0J 0.137J 2.26J
MW-8a 16-Mar-17 69.3J 0.393J 0.740J 2.67J 4.42J 0.317J 4.36J 9.38J
MW-8a 5-Oct-17 78.9J 0.456J 3.46J 3.44J 0.679J 6.69J
MW-9 21-Dec-16 0.39J 4.7 37 0.37J 0.87BL,J 7.3 11 2.8J 4.6 15 0.71J 0.085J 0.26J 12 18
MW-9 16-Mar-17 27.1 112 1.71 0.898J 40.7 23.7 10.6 21.6 36.3J 1.28J 0.343J 61.7 64.6
MW-9 5-Oct-17 10.9 68.3J 1.06 25.3 6.87J 9.21J 10.8 15.0J 1.33J 0.617J 41.3 20.1
MW-9 (dissolved)5-Oct-17 NA NA NA NA 2.81J NA NA NA NA NA 0.660J NA
Notes:
1. All units are in micrograms per liter (parts per billion).
2. * - Groundwater Protection Standard
3. ** - Indicates samples were filtered
4. dup - Duplicate Sample
5. MW-9 was installed on December 19, 2016.
6. J - Indicates the analytical result is an estimated concentration between the method detection limit and the method reporting limit.
8. R - Indicates that the analytical result is less than the Solid Waste Section Limit but greater than the laboratory reporting limit.
9. D - Indicates that the sample was analyzed at dilution.
10. Dissolved metals samples were collected to evaluate the influence of turbidity on total metal concentrations as part of an ongoing Alternate Source Demonstration.
11. NA - Not Analyzed
- Concentration exceeds 15A NCAC 02L .0202 or Groundwater Protection Standard.
- Indicates the result is below the detection limit.
7. BL - Indicates that the amount detected in the method blank was greater than the method detection limit.
Page 3 of 7 November 2017
Table 5b
Detected Groundwater Constituents - Volatile Organic Compounds
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Monitor Well CodeSample DateAcetoneBenzeneCarbon Disulfidecis-1,2-DichloroetheneChloroformChloromethane1,2-DichloroethaneEthylbenzene2-HexanoneMethylene ChlorideTolueneTrichloroethene6,000 1 700 70 70 3 0.4 600 40*5 600 3
100 1 100 5 5 1 1 1 50 1 1 1
MW-1 5-Apr-11
MW-1 15-Nov-11
MW-1 9-May-12
MW-1 16-Oct-12
MW-1 25-Apr-13
MW-1 24-Oct-13
MW-1 21-May-14
MW-1 2-Dec-14
MW-1 20-May-15
MW-1 21-Oct-15
MW-1 3-May-16
MW-1 30-Aug-16
MW-1 16-Mar-17
MW-1 5-Oct-17
MW-1a 4-Apr-11 4.3J
MW-1a 14-Nov-11 0.42J
MW-1a 8-May-12
MW-1a 15-Oct-12
MW-1a 24-Apr-13
MW-1a 24-Oct-13
MW-1a 20-May-14 9.3J
MW-1a 2-Dec-14
MW-1a 20-May-15
MW-1a 20-Oct-15 0.43J
MW-1a 3-May-16
MW-1a dup 3-May-16
MW-1a 30-Aug-16
MW-1a 16-Mar-17
MW-1a 4-Oct-17
MW-2 4-Apr-11 4.5J
MW-2 14-Nov-11
MW-2 8-May-12 3.72J
MW-2 15-Oct-12 8.37J 0.21J
MW-2 dup 15-Oct-12 7.04J 0.23J
MW-2 24-Apr-13
MW-2 23-Oct-13
MW-2 20-May-14 11J
MW-2 dup 20-May-14 7.7J
MW-2 2-Dec-14 6.8J
MW-2 20-May-15 46J
MW-2 21-Oct-15 2.6J
MW-2 3-May-16 0.40J
MW-2 29-Aug-16
MW-2 16-Mar-17 0.47J
MW-2 4-Oct-17
North Carolina 2L or Groundwater
Protection Standard
Solid Waste Section Limit
Page 4 of 7 November 2017
Table 5b
Detected Groundwater Constituents - Volatile Organic Compounds
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Monitor Well CodeSample DateAcetoneBenzeneCarbon Disulfidecis-1,2-DichloroetheneChloroformChloromethane1,2-DichloroethaneEthylbenzene2-HexanoneMethylene ChlorideTolueneTrichloroethene6,000 1 700 70 70 3 0.4 600 40*5 600 3
100 1 100 5 5 1 1 1 50 1 1 1
North Carolina 2L or Groundwater
Protection Standard
Solid Waste Section Limit
MW-2a 4-Apr-11
MW-2a 14-Nov-11
MW-2a 9-May-12 0.27J
MW-2a 15-Oct-12 2.99J
MW-2a 24-Apr-13
MW-2a 23-Oct-13
MW-2a dup 23-Oct-13
MW-2a 20-May-14 2.8J
MW-2a 2-Dec-14
MW-2a 20-May-15
MW-2a dup 20-May-15
MW-2a 21-Oct-15
MW-2a 3-May-16
MW-2a 30-Aug-16
MW-2a dup 30-Aug-16
MW-2a 16-Mar-17
MW-2a 4-Oct-17
MW-3 5-Apr-11
MW-3 15-Nov-11
MW-3 dup 15-Nov-11
MW-3 9-May-12
MW-3 16-Oct-12 2.36J
MW-3 25-Apr-13
MW-3 24-Oct-13
MW-3 21-May-14 23J
MW-3 2-Dec-14
MW-3 20-May-15
MW-3 21-Oct-15
MW-3 3-May-16
MW-3 30-Aug-16
MW-3 16-Mar-17
MW-3 5-Oct-17
MW-4 5-Apr-11
MW-4 dup 5-Apr-11
MW-4 15-Nov-11
MW-4 9-May-12
MW-4 16-Oct-12
MW-4 25-Apr-13
MW-4 24-Oct-13
MW-4 21-May-14 2.5J
MW-4 2-Dec-14
MW-4 20-May-15
MW-4 21-Oct-15
MW-4 3-May-16
MW-4 30-Aug-16
MW-4 16-Mar-17
MW-4 4-Oct-17
Page 5 of 7 November 2017
Table 5b
Detected Groundwater Constituents - Volatile Organic Compounds
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Monitor Well CodeSample DateAcetoneBenzeneCarbon Disulfidecis-1,2-DichloroetheneChloroformChloromethane1,2-DichloroethaneEthylbenzene2-HexanoneMethylene ChlorideTolueneTrichloroethene6,000 1 700 70 70 3 0.4 600 40*5 600 3
100 1 100 5 5 1 1 1 50 1 1 1
North Carolina 2L or Groundwater
Protection Standard
Solid Waste Section Limit
MW-5 4-Apr-11
MW-5 14-Nov-11
MW-5 8-May-12
MW-5 15-Oct-12
MW-5 24-Apr-13 5.9R
MW-5 dup 24-Apr-13 5.1R
MW-5 23-Oct-13
MW-5 20-May-14
MW-5 2-Dec-14
MW-5 dup 2-Dec-14
MW-5 20-May-15
MW-5 21-Oct-15
MW-5 dup 21-Oct-15
MW-5 3-May-16
MW-5 30-Aug-16
MW-5 16-Mar-17
MW-5 4-Oct-17
MW-5 dup 4-Oct-17 13J
MW-6 5-Apr-11
MW-6 15-Nov-11
MW-6 9-May-12
MW-6 16-Oct-12 2.85J
MW-6 25-Apr-13
MW-6 24-Oct-13
MW-6 21-May-14 4.1J
MW-6 2-Dec-14
MW-6 20-May-15
MW-6 21-Oct-15
MW-6 3-May-16
MW-6 30-Aug-16
MW-6 16-Mar-17
MW-6 dup 16-Mar-17
MW-6 5-Oct-17
MW-7 5-Apr-11
MW-7 15-Nov-11
MW-7 9-May-12 0.24J
MW-7 dup 9-May-12 1.15J
MW-7 16-Oct-12
MW-7 25-Apr-13
MW-7 24-Oct-13
MW-7 21-May-14
MW-7 2-Dec-14
MW-7 20-May-15
MW-7 21-Oct-15
MW-7 3-May-16
MW-7 30-Aug-16
MW-7 16-Mar-17
MW-7 5-Oct-17
Page 6 of 7 November 2017
Table 5b
Detected Groundwater Constituents - Volatile Organic Compounds
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
Monitor Well CodeSample DateAcetoneBenzeneCarbon Disulfidecis-1,2-DichloroetheneChloroformChloromethane1,2-DichloroethaneEthylbenzene2-HexanoneMethylene ChlorideTolueneTrichloroethene6,000 1 700 70 70 3 0.4 600 40*5 600 3
100 1 100 5 5 1 1 1 50 1 1 1
North Carolina 2L or Groundwater
Protection Standard
Solid Waste Section Limit
MW-8 5-Apr-11
MW-8 15-Nov-11
MW-8 9-May-12 0.34J
MW-8 16-Oct-12 0.20J
MW-8 25-Apr-13
MW-8 23-Oct-13
MW-8 21-May-14
MW-8 2-Dec-14
MW-8 20-May-15
MW-8 21-Oct-15
MW-8 3-May-16
MW-8 30-Aug-16
MW-8 16-Mar-17
MW-8 5-Oct-17
MW-8a 5-Apr-11
MW-8a 15-Nov-11
MW-8a 9-May-12 0.93J 0.54J
MW-8a 16-Oct-12
MW-8a 25-Apr-13
MW-8a 24-Oct-13
MW-8a 2-Dec-14
MW-8a 2-Dec-14
MW-8a 20-May-15
MW-8a 21-Oct-15
MW-8a 3-May-16
MW-8a 30-Aug-16
MW-8a 16-Mar-17
MW-8a 5-Oct-17
MW-9 21-Dec-16
MW-9 16-Mar-17
MW-9 5-Oct-17
Notes:
1. All units are in micrograms per liter (parts per billion).
2. * - Groundwater Protection Standard
3. dup - Duplicate sample
4. MW-9 was installed on December 19, 2016.
5. J - Indicates the analytical result is an estimated concentration between the method detection limit and the method reporting
limit.
6. R - Indicates that the analytical result is less than the SWSL but greater than the laboratory reporting limit.
- Concentration exceeds 15A NCAC 02L .0202 or Groundwater Protection Standard.
- Indicates the result is below the detection limit.
Page 7 of 7 November 2017
Table 6
Constituents Exceeding the Standards
October 2017 Semi-Annual Sampling Event
Onslow County Subtitle D Landfill
Facility Permit Number 6709-MSWLF-1997
6709-MSWLF-1997 MW-1 Thallium*
6709-MSWLF-1997 MW-1a Thallium*, Vanadium*
6709-MSWLF-1997 MW-2 Cobalt*, Thallium*, Vanadium*
6709-MSWLF-1997 MW-2a Arsenic, Cobalt*, Lead, Thallium*, Vanadium*
6709-MSWLF-1997 MW-3 Thallium*
6709-MSWLF-1997 MW-4 Thallium*, Vanadium*
6709-MSWLF-1997 MW-5 Cobalt*, Thallium*, Vanadium*
6709-MSWLF-1997 MW-6 Cobalt*, Thallium*, Vanadium*
6709-MSWLF-1997 MW-7 Cobalt*, Thallium*, Vanadium*
6709-MSWLF-1997 MW-8 Cobalt*, Thallium*, Vanadium*
6709-MSWLF-1997 MW-8a Thallium*, Vanadium*
6709-MSWLF-1997 MW-9 Arsenic, Chromium, Cobalt*, Thallium*, Vanadium*
Notes:
1. (*) - Groundwater Protection Standard
2. Bold = "J" flag detection
Monitoring Well
Code
OCTOBER 2017 PARAMETERS EXCEEDING
NORTH CAROLINA 2L OR GROUNDWATER
PROTECTION STANDARD
Facility Permit
Number
Page 1 of 1 November 2017
Figures
Appendix A
Laboratory Data

Appendix B
Landfill Gas Monitoring Data

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