WS-7706_7706_CA_MRP_20210413

TABLE OF CONTENTS

1.0 INTRODUCTION..................................................................................................................1
2.0 SITE BACKGROUND ..........................................................................................................1
3.0 GROUNDWATER INVESTIGATION ...............................................................................5
3.1 Groundwater Elevations ...................................................................................................5
3.2 Groundwater Analytical Results ......................................................................................6
4.0 CONCLUSIONS ....................................................................................................................7

TABLES

Table 1 Monitoring Well Construction Details
Table 2 Historical Groundwater Elevation Data
Table 3 Groundwater Analytical Data
Table 4 Historical Groundwater Analytical Data
Table 5 Natural Attenuation Parameter Data

FIGURES

Figure 1 Site Topographic Map
Figure 2 Site Map
Figure 3 Potential Receptor Map
Figure 4 Groundwater Elevation Contour Map
Figure 5 Dissolved Benzene Isoconcentration Contour Map
Figure 6 Dissolved MTBE Isoconcentration Contour Map

APPENDICES

Appendix A Laboratory Analytical Results
Appendix B Concentration vs. Time and Groundwater Elevation vs. Time Graphs

Active Remediation Monitoring Report April 13, 2021
Former ConocoPhillips Terminal No. 33441 (RM #6578) ATC Project No. P666578845

Page 1

1.0 INTRODUCTION

ATC Associates of North Carolina, P.C. (ATC) was retained by Phillips 66 Company to continue
active remediation monitoring activities at the former ConocoPhillips Terminal No. 33441
located at 115 South Chimney Rock Road in Greensboro, Guilford County, North Carolina. This
report documents two quarterly groundwater monitoring events performed in September and
December 2020.

2.0 SITE BACKGROUND

The former ConocoPhillips Terminal No. 33441 is located at 115 South Chimney Rock Road on
an approximate 7.79-acre parcel of land in an industrial area of western Greensboro. The site is
currently an active bulk fuel distribution terminal that consists of a control office building,
miscellaneous warehouse and storage buildings, and nine bulk fuel aboveground storage tanks
(ASTs), a covered bulk dispensing loading rack, and associated process piping. The terminal is
supplied with fuel and petroleum products by Colonial Pipeline that enters the site property from
the southwestern corner. The site property is currently owned and operated by Magellan
Terminals Holdings, L.P. (Magellan). A site topographic map is presented as Figure 1 and a site
map is presented as Figure 2.

The site has operated as a bulk fuel distribution terminal since the late 1950’s and is located in a
commercial/industrial area with no residential development within approximately 1,000 feet of
the site. Numerous other bulk fuel distribution terminals are located in the surrounding area.
Assessment activities were initiated following reports of impact to utilities adjacent to some of
the area terminals in December 1987. A Corrective Action Plan (CAP) submitted on March 1,
1993, recommended a dual-phase extraction (DPE) system for soil and groundwater remediation
at the site, which was approved by the North Carolina Department of Environmental Quality
(NCDEQ, formerly the North Carolina Department of Environment and Natural Resources) in
November 1993. The DPE system was installed during March 1995 and operated until November
2003 when it was shut down due to contaminant concentrations reportedly having reached
asymptotic levels with no apparent plume migration.
Active Remediation Monitoring Report April 13, 2021
Former ConocoPhillips Terminal No. 33441 (RM #6578) ATC Project No. P666578845

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A CAP Addendum was submitted in December 2003 recommending modifying the existing DPE
system to an air injection (AI) bio-enhancement remediation system, which was implemented
following NCDEQ approval. The AI system was started in April 2004.

A second CAP Addendum was submitted in September 2006 recommending enhanced anaerobic
bioremediation to address concentrations of dissolved petroleum hydrocarbons above the
Groundwater Standards established in Title 15A of the North Carolina Administrative Code
(NCAC) Subchapter 2L Section .0202 (2L Standards). Approval for a pilot test was issued by
NCDEQ; however, prior to securing a remediation permit and a permit to use a well for injection,
concentrations of dissolved petroleum hydrocarbons in groundwater samples showed decreasing
trends. As a result, operation of the AI system continued.

An Active Remediation Monitoring Report submitted on July 30, 2013, documented Phillips 66
recommendation to temporarily shut down the AI system to observe the effect on contaminant
concentrations over time and to evaluate potential rebounding. NCDEQ concurred with Phillips
66’s recommendation in a letter dated August 12, 2013, and consented to deactivation of the AI
system for one year.

On June 23, 2014, a gasoline release occurred under the operations of the current terminal
operator, Magellan, from a product line valve failure to Tank No. 8 in the vicinity of Phillips 66
monitoring well MW-11. Based on a July 25, 2014, Initial Assessment Report submitted by
Magellan and NCDEQ’s August 18, 2014 response, NCDEQ did not require additional
assessment or cleanup following Magellan’s initial abatement and excavation activities.
Accordingly, NCDEQ did not assign a new Incident Release Number to Magellan’s gasoline
release.

On October 3, 2014, a Remediation System Evaluation was submitted concluding that the AI
system was no longer effective in reducing compound concentrations at the site. Phillips 66
recommended permanently discontinuing operation of the AI system and removing the
mechanical and electrical components of the system from the site. Phillips 66 further
Active Remediation Monitoring Report April 13, 2021
Former ConocoPhillips Terminal No. 33441 (RM #6578) ATC Project No. P666578845

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recommended evaluating the effectiveness of utilizing Oxygen Release Compound (ORC®) filter
socks for further reducing the concentrations in groundwater immediately surrounding
monitoring well MW-12. In a letter dated October 20, 2014, NCDEQ concurred with Phillips
66’s recommendations to permanently discontinue operation of the AI system and evaluate the
effectiveness of ORC® filter socks in monitoring well MW-12.

On March 12, 2015, Phillips 66 submitted a “Notification of Intent to Construct or Operate
Injection Wells” to NCDEQ Division of Water Resources (DWR) Underground Injection Control
(UIC) Program. On March 31, 2015, ORC® filter socks were installed in monitoring well MW-
12, and an Injection Event Record was submitted to NCDEQ on April 8, 2015.

On February 18, 2016, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between July and December 2015. Based on the laboratory
analytical data, continued quarterly sampling and semi-annual reporting was recommended.

On September 1, 2016, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between March and July 2016 as well as the receptor survey
conducted in July 2016. The receptor survey identified a surface water body located within 500 feet
of the site. A retention pond is located on the site property which drains into Long Branch to the
southeast of the site. According to the NCDEQ Division of Water Resources, Long Branch is
identified as a Water Supply (WS) IV surface water body. No water supply wells were identified
during the July 2016 receptor survey. A potential receptor map is included as Figure 3. Based on
the laboratory analytical data, continued quarterly sampling and semi-annual reporting was
recommended.

On February 21, 2017, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between September and December 2016. Based on the
laboratory analytical data, continued quarterly sampling and semi-annual reporting was
recommended.

Active Remediation Monitoring Report April 13, 2021
Former ConocoPhillips Terminal No. 33441 (RM #6578) ATC Project No. P666578845

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On July 14, 2017, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between March and June 2017. Based on the laboratory
analytical data, continued quarterly sampling and semi-annual reporting was recommended.

On March 6, 2018, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between September and December 2017. Based on the
laboratory analytical data, continued quarterly sampling and semi-annual reporting was
recommended.

On July 31, 2018, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between March and June 2018. Based on the laboratory
analytical data, continued quarterly sampling and semi-annual reporting was recommended.

On February 28, 2019, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between September and December 2018. Based on the
laboratory analytical data, continued quarterly sampling and semi-annual reporting was
recommended.

On July 29, 2019, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between March and June 2019. Based on the laboratory
analytical data, continued quarterly sampling and semi-annual reporting was recommended.

On December 26, 2019, approximately 480 gallons of gasoline were released to the ground
surface at the Magellan terminal due to a valve failure in the manifold area near Tank No. 4 and
monitoring well MW-12. The release was reported verbally to NCDEQ on December 26, 2019.
Initial abatement actions were performed by Apex Companies, LLC (Apex), on behalf of
Magellan, and included the excavation of 75 cubic yards of petroleum impacted soils and the
removal of 12,549 gallons of petroleum contact water. An Initial Assessment Report for Non-
UST Releases was submitted to NCDEQ on April 2, 2020, documenting the abatement activities
and recommending no further action.

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Former ConocoPhillips Terminal No. 33441 (RM #6578) ATC Project No. P666578845

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On January 31, 2020, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between September and December 2019. Based on the
laboratory analytical data, continued quarterly sampling and semi-annual reporting was
recommended.

On August 12, 2020, an Active Remediation Monitoring Report was submitted documenting
monitoring activities performed between March and June 2020. Based on the laboratory
analytical data, continued quarterly sampling and semi-annual reporting was recommended.

This report documents groundwater sampling events performed in September and December
2020.

3.0 GROUNDWATER INVESTIGATION

3.1 Groundwater Elevations
On September 14, 2020, ATC measured groundwater elevations in wells MW-1, MW-2, MW-3,
MW-5, MW-6, MW-8, MW-9, MW-10, MW-11, MW-12, MW-13, DW-1, DPE-7, DPE-10, DPE-
11, DPE-14, DPE-18, DPE-19, DPE-20, and DPE-22. On December 9, 2020, ATC measured
groundwater elevations in MW-1, MW-2, MW-3, MW-5, MW-6, MW-7, MW-8, MW-9, MW-10,
MW-11, MW-12, MW-13, DW-1, DPE-7, DPE-10, DPE-11, DPE-14, DPE-18, DPE-19, DPE-20,
and DPE-22. An oil/water interface probe was used to measure the depth to water and the presence
of light non-aqueous phase liquid (LNAPL) in the monitoring wells. Based on the December 2020
gauging event, groundwater depths ranged from 1.53 feet bgs in MW-2 to 11.65 feet bgs in MW-
11. LNAPL was not detected during either sampling event.

Depth to water was measured from the top of each well casing and then converted into relative
elevations using previously established well elevations. Monitoring well construction information
is included as Table 1. Historical groundwater elevations are summarized in Table 2. A
groundwater elevation contour map for the December 2020 sampling event is included as Figure 4.
Based on the water table elevations, groundwater flow is towards the southeast.
Active Remediation Monitoring Report April 13, 2021
Former ConocoPhillips Terminal No. 33441 (RM #6578) ATC Project No. P666578845

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3.2 Groundwater Analytical Results
On September 14, 2020 and December 9, 2020, ATC collected groundwater samples from
monitoring wells MW-11, MW-12, and MW-13. Groundwater samples were collected into
laboratory-approved containers, packed in ice and delivered under chain-of-custody to SGS
Accutest in Scott, Louisiana for analyses. The groundwater samples were analyzed benzene,
toluene, ethylbenzene, total xylenes (BTEX), and methyl tertiary butyl ether (MTBE) via EPA
Method 6200B. In addition, natural attenuation parameters including temperature, dissolved
oxygen, pH, conductivity, turbidity, and oxygen releasing potential were measured in the
monitoring wells. The ORC socks were re-installed into MW-12 at the completion of the
sampling activities.

Laboratory analytical results from the September 2020 sampling event indicated MTBE (34.8
µg/L) above 2L Standards in MW-11. Benzene (24.5 µg/L) and MTBE (56.0 µg/L) were detected
above 2L Standards in MW-12.

Laboratory analytical results from the December 2020 sampling event indicated MTBE (21.7
µg/L) above 2L Standards in MW-11. Benzene (15.1 µg/L) and MTBE (63.9 µg/L) were detected
above 2L Standards in MW-12. No compounds exceeded the Gross Contaminant Levels (GCLs).
Due to the presence of a WS-IV surface water body within 500 feet of the site, groundwater
concentrations are also compared to the North Carolina 15A NCAC 02B Surface Water Standards
and Protective Values and the Environmental Protection Agency (EPA) Recommended Water
Quality Criteria (2B Standard) to determine if concentrations exceed the most stringent of the
freshwater, water supply, and human health standards by a factor of 10 (as cited in Title 15A
NCAC 02L .0506). Benzene exceeded the 2B Standard by a factor of 10 in monitoring well MW-
12 for the September and December 2020 sampling events. MTBE did not exceeded the 2B
Standards by a factor of 10 during the September and December 2020 sampling events.

The groundwater laboratory analytical report is included in Appendix A and summarized in
Table 3. Dissolved isoconcentration contour maps for benzene and MTBE are included as
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Former ConocoPhillips Terminal No. 33441 (RM #6578) ATC Project No. P666578845

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Figures 5 and 6, respectively. Table 4 presents historical groundwater analytical results.
Historical natural attenuation parameters are presented in Table 5. Concentration versus time and
groundwater elevation versus time graphs for monitoring wells MW-11, MW-12, and MW-13
are included in Appendix B.

4.0 CONCLUSIONS

Two quarterly groundwater sampling events were performed in September and December 2020
for the former ConocoPhillips Terminal No. 33441 in Greensboro, Guilford County, North
Carolina. Based on field activities, observations, and groundwater analytical results, ATC
concludes the following:

 The site meets the criteria for an “Intermediate” risk site due to the presence of a
retention pond and Little Branch surface water body within 500 feet of the site with
groundwater concentrations exceeding 10 times the applicable 2B Surface Water
Standards;
 Depth to groundwater measurements ranged from 1.53 feet bgs in MW-2 to 11.65
feet bgs in MW-11 (December 2020). The inferred shallow groundwater flow
direction across the site is to the southeast;
 Benzene and MTBE exceeded the 2L Standards. However, they did not exceed the
GCLs; and
 Benzene exceeded by a factor of 10 the applicable 2B Standards in MW-12 during
the September and December 2020 sampling events.

Based on the receptor survey conducted in June 2016, the site is classified as an Intermediate risk.
As a result, in order for the site to be applicable for site closure the groundwater concentrations
must be below the GCLs and 10 times the 2B Standards. LNAPL must also be absent from the site.
ATC recommends the installation of new oxygen releasing socks in in monitoring wells MW-11
and MW-12 in an effort to reduce the concentrations below the 2B Standards. ATC will sample
MW-11, MW-12, and MW-13 during the next quarterly sampling event in March and June 2021.

TABLES
TABLE 1
MONITORING WELL CONSTRUCTION DETAILS
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Depth of Water
(feet)
Depth of
LNAPL (feet)
Groundwater
Elevation
(feet)*
MW-1 2/12/1990 2 8.5-23.5 25.0 925.30 6.95 --918.35
MW-2 2/14/1990 2 5-20 20.0 915.16 0.97 914.19
MW-3 2/14/1990 2 5-20 20.0 915.26 5.64 --909.62
MW-4 2/14/1990 2 7.5-22.5 22.5 910.89
MW-5 2/13/1990 2 4.5-19.5 20.0 912.25 4.32 --907.93
MW-6 2/13/1990 2 8.5-23.5 25.0 921.74 11.05 --910.69
MW-7 2/13/1990 2 7-22 25.0 924.77 7.52 --917.25
MW-8 2/12/1990 2 8.5-23.5 25.0 926.09 9.33 --916.76
MW-9 7/31/1990 2 4.7-19.7 20.0 924.93 8.17 --916.76
MW-10 8/2/1990 2 5-20 20.0 923.42 9.18 --914.24
MW-11 8/2/1990 2 4.3-19.3 20.0 922.60 11.21 --911.39
MW-12 8/2/1990 2 4.5-19.5 20.0 923.90 8.91 --914.99
MW-13 8/3/1990 2 4.5-19.5 20.0 925.63 7.88 --917.75
MW-14 Unknown Unknown Unknown Unknown 925.48
MW-15 Unknown Unknown Unknown Unknown 924.63
MW-16 Unknown Unknown Unknown Unknown 919.02
DW-1 Unknown 2 45-50 50.0 925.27 8.24 --917.03
DW-2 Unknown 2 60-70 75.0 925.65
DW-3 Unknown 2 33-38 38.5 919.93
DPE-1 Unknown Unknown Unknown Unknown 923.10
DPE-2 Unknown Unknown Unknown Unknown 921.55
DPE-3 Unknown Unknown Unknown Unknown 921.15
DPE-4 Unknown Unknown Unknown Unknown 920.41
DPE-5 Unknown Unknown Unknown Unknown 920.77
DPE-6 Unknown Unknown Unknown Unknown 921.03
DPE-7 Unknown Unknown Unknown Unknown 920.98 4.53 --916.45
DPE-8 Unknown Unknown Unknown Unknown 920.93
DPE-9 Unknown Unknown Unknown Unknown 920.81
DPE-10 Unknown Unknown Unknown Unknown 920.33 3.48 --916.85
DPE-11 Unknown Unknown Unknown Unknown 920.39 4.48 --915.91
DPE-12 Unknown Unknown Unknown Unknown 921.33
DPE-13 Unknown Unknown Unknown Unknown 920.91
DPE-14 Unknown Unknown Unknown Unknown 919.98 5.88 --914.10
DPE-15 Unknown Unknown Unknown Unknown 920.41
DPE-16 Unknown Unknown Unknown Unknown 923.03
DPE-17 Unknown Unknown Unknown Unknown 922.77
DPE-18 Unknown Unknown Unknown Unknown 923.71 5.00 --918.71
DPE-19 Unknown Unknown Unknown Unknown 924.13 5.23 --918.90
DPE-20 Unknown Unknown Unknown Unknown 924.07 5.12 --918.95
DPE-21 Unknown Unknown Unknown Unknown 922.89
DPE-22 Unknown Unknown Unknown Unknown 921.76 4.68 --917.08
DPE-23 Unknown Unknown Unknown Unknown 921.57
Notes:
1. * = Corrected Groundwater Elevation = (Groundwater Elevation + (Product Thickness *0.8581))
2. Elevations are referenced to an arbitrary on-site benchmark of 100.00 feet.
3. Total well depths measured from top of casing.
4. LNAPL = Light Non Aqueous Phase Liquid
Well Not Measured
Converted to Sparge Well
Top of Casing
(feet)
Date Measured: 6/03/2020
Abandoned
Converted to Sparge Well
Well Destroyed
Well Not Measured
Well Not Measured
Monitoring
Well ID Date Installed
Well Casing
Diameter
(Inches)
Screened
Interval
(feet)
Depth of Well
(feet)
Well Not Measured
Converted to Sparge Well
Converted to Sparge Well
Converted to Sparge Well
Converted to Sparge Well
Converted to Sparge Well
Destroyed
Converted to Sparge Well
Converted to Sparge Well
Converted to Sparge Well
Well Not Measured
Well Not Measured
Converted to Sparge Well
Well Not Measured
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 925.30 9.78 0.00 915.52
06/30/09 925.30 9.89 0.00 915.41
08/31/09 925.30 13.46 0.00 911.84
06/30/11 925.30 11.66 0.00 913.64
12/20/11 925.30 10.24 0.00 915.06
03/29/12 925.30 9.76 0.00 915.54
06/28/12 925.30 12.45 0.00 912.85
12/03/12 925.30 13.95 0.00 911.35
06/28/13 925.30 10.52 0.00 914.78
12/30/13 925.30 12.73 0.00 912.57
06/27/14 925.30 12.42 0.00 912.88
12/30/14 925.30 13.34 0.00 911.96
06/12/15 925.30 12.39 0.00 912.91
12/17/15 925.30 9.95 0.00 915.35
03/09/16 925.30 8.49 0.00 916.81
06/21/16 925.30 10.00 0.00 915.30
12/20/16 925.30 14.94 0.00 910.36
06/13/17 925.30 10.45 0.00 914.85
12/05/17 925.30 15.83 0.00 909.47
06/07/18 925.30 10.92 0.00 914.38
09/11/18 925.30 11.15 0.00 914.15
12/18/18 925.30 7.08 0.00 918.22
03/13/19 925.30 6.94 0.00 918.36
06/12/19 925.30 9.21 0.00 916.09
09/11/19 925.30 11.21 0.00 914.09
12/20/19 925.30 8.83 0.00 916.47
03/04/20 925.30 7.49 0.00 917.81
06/03/20 925.30 6.95 0.00 918.35
09/14/20 925.30 11.00 0.00 914.30
12/09/20 925.30 8.39 0.00 916.91
04/28/09 915.16 2.55 0.00 912.61
06/30/09 915.16 3.21 0.00 911.95
08/31/09 915.16 5.93 0.00 909.23
06/30/11 915.16 4.34 0.00 910.82
12/20/11 915.16 2.99 0.00 912.17
03/29/12 915.16 2.22 0.00 912.94
06/28/12 915.16 4.97 0.00 910.19
12/03/12 915.16 5.18 0.00 909.98
06/28/13 915.16 2.15 0.00 913.01
12/30/13 915.16 4.35 0.00 910.81
06/27/14 915.16 4.94 0.00 910.22
12/30/14 915.16 5.08 0.00 910.08
06/12/15 915.16 4.81 0.00 910.35
12/17/15 915.16 2.58 0.00 912.58
06/21/16 915.16 3.47 0.00 911.69
12/20/16 915.16 5.65 0.00 909.51
06/13/17 915.16 3.15 0.00 912.01
12/05/17 915.16 6.41 0.00 908.75
06/07/18 915.16 3.47 0.00 911.69
09/11/18 915.16 3.80 0.00 911.36
12/18/18 915.16 1.06 0.00 914.10
03/13/19 915.16 0.50 0.00 914.66
06/12/19 915.16 2.23 0.00 912.93
09/11/19 915.16
12/20/19 915.16 1.84 0.00 913.32
03/04/20 915.16 0.98 0.00 914.18
06/03/20 915.16 0.97 0.00 914.19
09/14/20 915.16 3.41 0.00 911.75
12/09/20 915.16 1.53 0.00 913.63
Note:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
MW-1
MW-2
Well Not Measured
Page 1 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 915.26 7.76 0.00 907.50
06/30/09 915.26 8.98 0.00 906.28
08/31/09 915.26 11.92 0.00 903.34
12/20/11 915.26 9.08 0.00 906.18
03/29/12 915.26 7.88 0.00 907.38
06/28/12 915.26 11.30 0.00 903.96
12/03/12 915.26 10.79 0.00 904.47
06/28/13 915.26 7.56 0.00 907.70
12/30/13 915.26 9.75 0.00 905.51
06/27/14 915.26 11.25 0.00 904.01
12/30/14 915.26 11.28 0.00 903.98
06/12/15 915.26 11.18 0.00 904.08
12/17/15 915.26 8.02 0.00 907.24
03/09/16 915.26 6.24 0.00 909.02
06/21/16 915.26 8.99 0.00 906.27
12/20/16 915.26 10.20 0.00 905.06
06/13/17 915.26 8.88 0.00 906.38
12/05/17 915.26 11.42 0.00 903.84
06/07/18 915.26 9.32 0.00 905.94
09/11/18 915.26 10.25 0.00 905.01
12/18/18 915.26 6.50 0.00 908.76
03/13/19 915.26 5.12 0.00 910.14
06/12/19 915.26 7.24 0.00 908.02
09/11/19 915.26 9.61 0.00 905.65
12/20/19 915.26 6.81 0.00 908.45
03/04/20 915.26 5.27 0.00 909.99
06/03/20 915.26 5.64 0.00 909.62
09/14/20 915.26 9.30 0.00 905.96
12/09/20 915.26 6.29 0.00 908.97
MW-4 04/28/09 910.89
04/28/09 912.25 5.62 0.00 906.63
06/30/09 912.25 5.73 0.00 906.52
08/31/09 912.25 7.25 0.00 905.00
06/30/11 912.25 6.29 0.00 905.96
12/20/11 912.25 5.92 0.00 906.33
03/29/12 912.25 5.73 0.00 906.52
06/28/12 912.25 7.04 0.00 905.21
12/03/12 912.25 7.58 0.00 904.67
06/28/13 912.25 3.38 0.00 908.87
12/30/13 912.25 5.55 0.00 906.70
06/27/14 912.25 7.00 0.00 905.25
12/30/14 912.25 7.29 0.00 904.96
06/12/15 912.25 6.97 0.00 905.28
12/17/15 912.25 4.65 0.00 907.60
03/09/16 912.25 4.77 0.00 907.48
06/21/16 912.25 5.53 0.00 906.72
12/20/16 912.25 7.24 0.00 905.01
06/13/17 912.25 7.58 0.00 904.67
12/05/17 912.25 8.02 0.00 904.23
06/07/18 912.25 5.70 0.00 906.55
09/11/18 912.25 5.96 0.00 906.29
12/18/18 912.25 4.00 0.00 908.25
03/13/19 912.25 4.30 0.00 907.95
06/12/19 912.25 4.61 0.00 907.64
09/11/19 912.25 5.65 0.00 906.60
12/20/19 912.25 4.67 0.00 907.58
03/04/20 912.25 4.51 0.00 907.74
06/03/20 912.25 4.32 0.00 907.93
09/14/20 912.25 5.79 0.00 906.46
12/09/20 912.25 4.43 0.00 907.82
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
MW-3
MW-5
Well Destroyed
Page 2 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 921.74 12.54 0.00 909.20
06/30/09 921.74 12.55 0.00 909.19
08/31/09 921.74 15.31 0.00 906.43
06/30/11 921.74 13.80 0.00 907.94
12/20/11 921.74 13.04 0.00 908.70
03/29/12 921.74 13.09 0.00 908.65
12/03/12 921.74 15.62 0.00 906.12
06/28/13 921.74 12.11 0.00 909.63
12/30/13 921.74 14.28 0.00 907.46
06/27/14 921.74 15.06 0.00 906.68
12/30/14 921.74 15.34 0.00 906.40
06/12/15 921.74 14.91 0.00 906.83
12/17/15 921.74 11.82 0.00 909.92
06/21/16 921.74 12.69 0.00 909.05
12/20/16 921.74 15.54 0.00 906.20
06/13/17 921.74 12.62 0.00 909.12
12/05/17 921.74 16.37 0.00 905.37
06/07/18 921.74 13.16 0.00 908.58
09/11/18 921.74 13.44 0.00 908.30
12/18/18 921.74 10.30 0.00 911.44
03/13/19 921.74 11.12 0.00 910.62
06/12/19 921.74 12.17 0.00 909.57
09/11/19 921.74 13.27 0.00 908.47
12/20/19 921.74 11.50 0.00 910.24
03/04/20 921.74 11.58 0.00 910.16
06/03/20 921.74 11.05 0.00 910.69
09/14/20 921.74 13.37 0.00 908.37
12/09/20 921.74 11.60 0.00 910.14
04/28/09 924.77 11.03 0.00 913.74
06/30/09 924.77 10.76 0.00 914.01
08/31/09 924.77 15.08 0.00 909.69
06/30/11 924.77 12.71 0.00 912.06
12/20/11 924.77 11.44 0.00 913.33
03/29/12 924.77 11.95 0.00 912.82
06/28/12 924.77 14.15 0.00 910.62
12/03/12 924.77 16.13 0.00 908.64
06/28/13 924.77 12.15 0.00 912.62
12/30/13 924.77 14.36 0.00 910.41
06/27/14 924.77 14.10 0.00 910.67
12/30/14 924.77 15.25 0.00 909.52
06/12/15 924.77 13.98 0.00 910.79
12/17/15 924.77 10.47 0.00 914.30
06/21/16 924.77 11.68 0.00 913.09
12/20/16 924.77 16.68 0.00 908.09
06/13/17 924.77 10.78 0.00 913.99
12/05/17 924.77 17.42 0.00 907.35
06/07/18 924.77 11.86 0.00 912.91
09/11/18 924.77 11.83 0.00 912.94
12/18/18 924.77 6.05 0.00 918.72
03/13/19 924.77 8.04 0.00 916.73
06/12/19 924.77 9.52 0.00 915.25
09/11/19 924.77 12.22 0.00 912.55
12/20/19 924.77 9.13 0.00 915.64
03/04/20 924.77
06/03/20 924.77 7.52 0.00 917.25
09/14/20 924.77 12.44 0.00 912.33
12/09/20 924.77 9.63 0.00 915.14
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
Not Measured
MW-7
MW-6
Page 3 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 926.09 12.20 0.00 913.89
06/30/09 926.09 12.07 0.00 914.02
08/31/09 926.09 16.13 0.00 909.96
06/30/11 926.09 13.62 0.00 912.47
12/20/11 926.09 12.31 0.00 913.78
03/29/12 926.09 12.65 0.00 913.44
06/28/12 926.09 14.79 0.00 911.30
12/03/12 926.09 16.27 0.00 909.82
06/28/13 926.09 13.07 0.00 913.02
12/30/13 926.09 15.29 0.00 910.80
06/27/14 926.09 14.76 0.00 911.33
12/30/14 926.09 15.53 0.00 910.56
06/12/15 926.09 14.46 0.00 911.63
12/17/15 926.09 11.73 0.00 914.36
06/21/16 926.09 12.88 0.00 913.21
12/20/16 926.09 16.81 0.00 909.28
06/13/17 926.09 12.30 0.00 913.79
12/05/17 926.09 17.85 0.00 908.24
06/07/18 926.09 13.00 0.00 913.09
09/11/18 926.09 13.10 0.00 912.99
12/18/18 926.09 8.97 0.00 917.12
03/13/19 926.09 9.68 0.00 916.41
06/12/19 926.09 11.33 0.00 914.76
09/11/19 926.09 13.48 0.00 912.61
12/20/19 926.09 10.69 0.00 915.40
03/04/20 926.09 10.11 0.00 915.98
06/03/20 926.09 9.33 0.00 916.76
09/14/20 926.09 13.31 0.00 912.78
12/09/20 926.09 10.78 0.00 915.31
04/28/09 924.93 11.05 0.00 913.88
06/30/09 924.93 10.81 0.00 914.12
08/31/09 924.93 14.79 0.00 910.14
06/30/11 924.93 12.81 0.00 912.12
12/20/11 924.93 11.47 0.00 913.46
03/29/12 924.93 11.85 0.00 913.08
06/28/12 924.93 13.94 0.00 910.99
12/03/12 924.93 15.95 0.00 908.98
06/28/13 924.93 12.72 0.00 912.21
12/30/13 924.93 14.92 0.00 910.01
06/27/14 924.93 13.91 0.00 911.02
12/30/14 924.93 15.44 0.00 909.49
06/12/15 924.93 13.87 0.00 911.06
12/17/15 924.93 10.46 0.00 914.47
03/09/16 924.93 10.07 0.00 914.86
06/21/16 924.93 11.80 0.00 913.13
12/20/16 924.93 15.02 0.00 909.91
03/21/17 924.93 14.50 0.00 910.43
06/13/17 924.93 10.85 0.00 914.08
12/05/17 924.93 17.02 0.00 907.91
06/07/18 924.93 11.70 0.00 913.23
09/11/18 924.93 11.50 0.00 913.43
12/18/18 924.93 6.84 0.00 918.09
03/13/19 924.93 8.68 0.00 916.25
06/12/19 924.93 9.66 0.00 915.27
09/11/19 924.93 12.34 0.00 912.59
12/20/19 924.93 9.40 0.00 915.53
03/04/20 924.93 9.21 0.00 915.72
06/03/20 924.93 8.17 0.00 916.76
09/14/20 924.93 12.33 0.00 912.60
12/09/20 924.93 9.93 0.00 915.00
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
MW-8
MW-9
Page 4 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 923.42 11.48 0.00 911.94
06/30/09 923.42 11.41 0.00 912.01
08/31/09 923.42 12.78 0.00 910.64
12/20/11 923.42 11.71 0.00 911.71
03/29/12 923.42 11.62 0.00 911.80
06/28/12 923.42 13.06 0.00 910.36
12/03/12 923.42 14.75 0.00 908.67
06/28/13 923.42 10.96 0.00 912.46
12/30/13 923.42 13.50 0.00 909.92
06/27/14 923.42 13.01 0.00 910.41
12/30/14 923.42 14.13 0.00 909.29
06/12/15 923.42 12.81 0.00 910.61
12/17/15 923.42 11.07 0.00 912.35
06/21/16 923.42 11.32 0.00 912.10
12/20/16 923.42 NM NM NM
06/13/17 923.42 11.20 0.00 912.22
12/05/17 923.42 NM NM NM
06/07/18 923.42 11.63 NM 911.79
09/11/18 923.42 11.50 NM 911.92
12/18/18 923.42 9.14 NM 914.28
03/13/19 923.42 8.68 0.00 914.74
06/12/19 923.42 10.00 0.00 913.42
09/11/19 923.42 11.89 0.00 911.53
12/20/19 923.42 10.52 0.00 912.90
03/04/20 923.42 9.90 0.00 913.52
06/03/20 923.42 9.18 0.00 914.24
09/14/20 923.42 11.79 0.00 911.63
12/09/20 923.42 10.10 0.00 913.32
04/28/09 922.60 11.83 0.00 910.77
06/30/09 922.60 12.00 0.00 910.60
08/31/09 922.60 13.27 0.00 909.33
03/25/10 922.60 10.14 0.00 912.46
06/23/10 922.60 10.51 0.00 912.09
09/29/10 922.60 12.63 0.00 909.97
12/28/10 922.60 12.97 0.00 909.63
06/30/11 922.60 12.79 0.00 909.81
09/29/11 922.60 14.44 0.00 908.16
12/20/11 922.60 12.99 0.00 909.61
03/29/12 922.60 12.82 0.00 909.78
06/28/12 922.60 13.95 0.00 908.65
09/26/12 922.60 13.74 0.00 908.86
12/03/12 922.60 15.39 0.00 907.21
03/28/13 922.60 12.62 0.00 909.98
06/28/13 922.60 11.23 0.00 911.37
09/04/13 922.60 11.81 0.00 910.79
12/30/13 922.60 13.71 0.00 908.89
03/31/14 922.60 12.68 0.00 909.92
06/27/14 922.60 13.90 0.00 908.70
09/16/14 922.60 13.84 0.00 908.76
12/30/14 922.60 14.92 0.00 907.68
03/31/15 922.60 12.00 0.00 910.60
06/12/15 922.60 13.01 0.00 909.59
09/17/15 922.60 15.75 0.00 906.85
12/17/15 922.60 12.12 0.00 910.48
03/09/16 922.60 11.93 0.00 910.67
06/21/16 922.60 12.15 0.00 910.45
09/29/16 922.60 13.71 0.00 908.89
12/20/16 922.60 15.34 0.00 907.26
03/21/17 922.60 14.05 0.00 908.55
06/13/17 922.60 12.25 0.00 910.35
09/20/17 922.60 14.54 0.00 908.06
12/05/17 922.60 15.99 0.00 906.61
03/27/18 922.60 11.84 0.00 910.76
06/07/18 922.60 12.74 0.00 909.86
09/11/18 922.60 12.78 0.00 909.82
12/18/18 922.60 10.78 0.00 911.82
03/13/19 922.60 11.47 0.00 911.13
06/12/19 922.60 11.83 0.00 910.77
09/11/19 922.60 12.59 0.00 910.01
12/20/19 922.60 12.04 0.00 910.56
03/04/20 922.60 11.65 0.00 910.95
06/03/20 922.60 11.21 0.00 911.39
09/14/20 922.60 12.81 0.00 909.79
12/09/20 922.60 11.65 0.00 910.95
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
MW-10
MW-11
Page 5 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 923.90 10.40 0.00 913.50
06/30/09 923.90 10.71 0.00 913.19
08/31/09 923.90 14.10 0.00 909.80
11/30/09 923.90 10.45 0.00 913.45
03/25/10 923.90 9.77 0.00 914.13
06/23/10 923.90 11.43 0.00 912.47
09/29/10 923.90 13.81 0.00 910.09
12/28/10 923.90 13.16 0.00 910.74
06/30/11 923.90 12.21 0.00 911.69
09/29/11 923.90 13.26 0.00 910.64
12/20/11 923.90 11.20 0.00 912.70
03/29/12 923.90 8.87 0.00 915.03
06/28/12 923.90 13.06 0.00 910.84
09/26/12 923.90 11.65 0.00 912.25
12/03/12 923.90 13.68 0.00 910.22
03/28/13 923.90 10.81 0.00 913.09
06/28/13 923.90 9.70 0.00 914.20
09/04/13 923.90 9.53 0.00 914.37
12/30/13 923.90 11.81 0.00 912.09
03/31/14 923.90 10.73 0.00 913.17
06/27/14 923.90 13.00 0.00 910.90
09/16/14 923.90 11.76 0.00 912.14
12/30/14 923.90 13.44 0.00 910.46
03/31/15 923.90 10.50 0.00 913.40
06/12/15 923.90 12.82 0.00 911.08
09/17/15 923.90 15.37 0.00 908.53
12/17/15 923.90 12.09 0.00 911.81
03/09/16 923.90 9.77 0.00 914.13
06/21/16 923.90 11.85 0.00 912.05
09/29/16 923.90 14.36 0.00 909.54
12/20/16 923.90 15.15 0.00 908.75
03/21/17 923.90 14.00 0.00 909.90
06/13/17 923.90 11.39 0.00 912.51
09/20/17 923.90 14.71 0.00 909.19
12/05/17 923.90 15.58 0.00 908.32
03/27/18 923.90 14.61 0.00 909.29
06/07/18 923.90 12.70 0.00 911.20
09/11/18 923.90 11.81 0.00 912.09
12/18/18 923.90 8.89 0.00 915.01
03/13/19 923.90 9.06 0.00 914.84
06/12/19 923.90 10.14 0.00 913.76
09/11/19 923.90 11.61 0.00 912.29
12/20/19 923.90 10.48 0.00 913.42
03/04/20 923.90 9.16 0.00 914.74
06/03/20 923.90 8.91 0.00 914.99
09/14/20 923.90 12.00 0.00 911.90
12/09/20 923.90 9.72 0.00 914.18
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
MW-12
Page 6 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 925.63 10.91 0.00 914.72
06/30/09 925.63 10.99 0.00 914.64
08/31/09 925.63 14.83 0.00 910.80
03/25/10 925.63 10.08 0.00 915.55
06/24/10 925.63 11.61 0.00 914.02
09/29/10 925.63 14.02 0.00 911.61
12/28/10 925.63 13.89 0.00 911.74
06/30/11 925.63 12.53 0.00 913.10
09/29/11 925.63 13.96 0.00 911.67
12/20/11 925.63 11.33 0.00 914.30
03/29/12 925.63 11.20 0.00 914.43
06/28/12 925.63 13.55 0.00 912.08
09/26/12 925.63 12.94 0.00 912.69
12/03/12 925.63 15.12 0.00 910.51
03/28/13 925.63 10.96 0.00 914.67
06/28/13 925.63 11.27 0.00 914.36
09/04/13 925.63 11.53 0.00 914.10
12/30/13 925.63 13.59 0.00 912.04
03/31/14 925.63 10.52 0.00 915.11
06/27/14 925.63 13.50 0.00 912.13
09/16/14 925.63 13.05 0.00 912.58
12/30/14 925.63 14.36 0.00 911.27
03/31/15 925.63 10.75 0.00 914.88
06/12/15 925.63 12.97 0.00 912.66
09/17/15 925.63 16.28 0.00 909.35
12/17/15 925.63 10.90 0.00 914.73
03/09/16 925.63 9.71 0.00 915.92
06/21/16 925.63 11.67 0.00 913.96
09/29/16 925.63 14.20 0.00 911.43
12/20/16 925.63 15.49 0.00 910.14
03/21/17 925.63 13.83 0.00 911.80
06/13/17 925.63 11.04 0.00 914.59
09/20/17 925.63 14.62 0.00 911.01
12/05/17 925.63 16.45 0.00 909.18
03/27/18 925.63 10.70 0.00 914.93
06/07/18 925.63 11.73 0.00 913.90
09/11/18 925.63 11.76 0.00 913.87
12/18/18 925.63 8.66 0.00 916.97
03/13/19 925.63 8.34 0.00 917.29
06/12/19 925.63 9.42 0.00 916.21
09/11/19 925.63 12.21 0.00 913.42
12/20/19 925.63 9.71 0.00 915.92
03/04/20 925.63 9.09 0.00 916.54
06/03/20 925.63 7.88 0.00 917.75
09/14/20 925.63 12.22 0.00 913.41
12/09/20 925.63 9.72 0.00 915.91
04/28/09 925.48 11.36 0.00 914.12
06/30/09 925.48 11.10 0.00 914.38
08/31/09 925.48 17.28 0.00 908.20
04/28/09 924.63 12.71 0.00 911.92
06/30/09 924.63 12.65 0.00 911.98
08/31/09 924.63 16.29 0.00 908.34
MW-16 06/28/04 919.02
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
MW-14
MW-15
MW-13
Abandoned
Page 7 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 925.27 10.38 0.00 914.89
06/30/09 925.27 10.39 0.00 914.88
08/31/09 925.27 14.25 0.00 911.02
12/20/11 925.27 10.72 0.00 914.55
03/29/12 925.27 10.66 0.00 914.61
06/28/12 925.27 12.97 0.00 912.30
12/03/12 925.27 14.42 0.00 910.85
06/28/13 925.27 10.62 0.00 914.65
12/30/13 925.27 12.81 0.00 912.46
06/27/14 925.27 12.95 0.00 912.32
12/30/14 925.27 13.70 0.00 911.57
06/12/15 925.27 12.91 0.00 912.36
12/17/15 925.27 10.18 0.00 915.09
06/21/16 925.27 11.00 0.00 914.27
12/20/16 925.27 15.04 0.00 910.23
06/13/17 925.27 10.53 0.00 914.74
12/05/17 925.27 15.95 0.00 909.32
09/11/18 925.27 11.34 0.00 913.93
12/18/18 925.27 7.37 0.00 917.90
03/13/19 925.27 7.69 0.00 917.58
06/12/19 925.27 9.50 0.00 915.77
09/11/19 925.27 11.55 0.00 913.72
12/20/19 925.27 9.04 0.00 916.23
03/04/20 925.27 10.18 0.00 915.09
06/03/20 925.27 8.24 0.00 917.03
09/14/20 925.27 11.34 0.00 913.93
12/09/20 925.27 8.88 0.00 916.39
04/28/09 925.65 12.23 0.00 913.42
11/30/09 925.65
04/28/09 919.93 12.30 0.00 907.63
11/30/09 919.93
04/28/09 923.10 2.04 0.00 921.06
06/30/09 923.10 6.83 0.00 916.27
08/31/09 923.10 9.86 0.00 913.24
DPE-2 06/28/04 921.55
DPE-3 06/28/04 921.15
DPE-4 06/28/04 920.41
DPE-5 06/28/04 920.77
04/28/09 921.03 7.88 0.00 913.15
06/30/09 921.03 7.65 0.00 913.38
08/31/09 921.03 11.59 0.00 909.44
12/20/11 921.03 8.22 0.00 912.81
03/29/12 921.03 8.58 0.00 912.45
06/28/12 921.03 10.70 0.00 910.33
12/03/12 921.03 12.69 0.00 908.34
06/28/13 921.03 8.94 0.00 912.09
12/30/13 921.03 11.08 0.00 909.95
06/27/14 921.03 10.66 0.00 910.37
12/30/14 921.03 11.89 0.00 909.14
06/12/15 921.03 10.57 0.00 910.46
12/17/15 921.03
06/21/16 921.03 6.60 0.00 914.43
12/20/16 921.03
06/13/17 921.03
12/05/17 921.03
09/11/18 921.03
12/18/18 921.03
03/13/19 921.03
06/12/19 921.03
03/04/20 921.03
06/03/20 921.03
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
DW-2
DW-3
DPE-1
Unable to Locate
Unable to Locate
Unable to Locate
DW-1
DPE-6
Unable to Locate
Unable to Locate
Unable to Locate
Unable to Locate
Unable to Locate
Well under water
Unable to Locate
Sparge Well - No Longer Measured
Sparge well - no longer measured
Sparge well - no longer measured
Sparge well - no longer measured
Sparge Well - No Longer Measured
Sparge well - no longer measured
Page 8 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 920.98 8.17 0.00 912.81
06/30/09 920.98 7.90 0.00 913.08
08/31/09 920.98 11.62 0.00 909.36
12/20/11 920.98 8.52 0.00 912.46
03/29/12 920.98 8.90 0.00 912.08
06/28/12 920.98 11.02 0.00 909.96
12/03/12 920.98 13.08 0.00 907.90
06/28/13 920.98 8.95 0.00 912.03
12/30/13 920.98 11.11 0.00 909.87
06/27/14 920.98 10.97 0.00 910.01
12/30/14 920.98 12.10 0.00 908.88
06/12/15 920.98 10.84 0.00 910.14
12/17/15 920.98 7.43 0.00 913.55
06/21/16 920.98 8.60 0.00 912.38
12/20/16 920.98 13.53 0.00 907.45
06/13/17 920.98 7.80 0.00 913.18
12/05/17 920.98 14.29 0.00 906.69
12/18/18 920.98 3.31 0.00 917.67
03/13/19 920.98 5.03 0.00 915.95
06/12/19 920.98 6.30 0.00 914.68
09/11/19 920.98 9.07 0.00 911.91
12/20/19 920.98
03/04/20 920.98 5.98 0.00 915.00
06/03/20 920.98 4.53 0.00 916.45
09/14/20 920.98 9.35 0.00 911.63
12/09/20 920.98 6.67 0.00 914.31
04/28/09 920.93 7.50 0.00 913.43
06/30/09 920.93 7.32 0.00 913.61
12/20/11 920.93 7.75 0.00 913.18
03/29/12 920.93 7.97 0.00 912.96
06/28/12 920.93 10.02 0.00 910.91
12/03/12 920.93 11.92 0.00 909.01
06/28/13 920.93 7.98 0.00 912.95
12/30/13 920.93 10.15 0.00 910.78
06/27/14 920.93 9.97 0.00 910.96
12/30/14 920.93 11.04 0.00 909.89
06/12/15 920.93 9.96 0.00 910.97
12/17/15 920.93
04/28/09 920.81 7.43 0.00 913.38
06/30/09 920.81 7.13 0.00 913.68
08/31/09 920.81 10.10 0.00 910.71
12/20/11 920.81 7.47 0.00 913.34
03/29/12 920.81 7.69 0.00 913.12
06/28/12 920.81 9.67 0.00 911.14
12/03/12 920.81 11.55 0.00 909.26
06/28/13 920.81 7.62 0.00 913.19
12/30/13 920.81 9.81 0.00 911.00
06/27/14 920.81 9.61 0.00 911.20
12/30/14 920.81 10.68 0.00 910.13
06/12/15 920.81 9.54 0.00 911.27
12/17/15 920.81 4.58 0.00 916.23
06/21/16 920.81 7.70 0.00 913.11
12/20/16
06/13/17 920.81 8.08 0.00 912.73
12/05/17
12/18/18
03/13/19
06/12/19
03/04/20
06/03/20
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
Unable to Locate
DPE-7
Well Not Located
Well under water
DPE-8
DPE-9
Well Not Located
Well Not Located
Well Not Located
Well Not Located
Well Not Located
Well Not Located
Page 9 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 920.33 7.48 0.00 912.85
06/30/09 920.33 7.24 0.00 913.09
08/31/09 920.33 9.89 0.00 910.44
12/20/11 920.33 7.65 0.00 912.68
03/29/12 920.33 7.80 0.00 912.53
06/28/12 920.33 9.81 0.00 910.52
12/03/12 920.33 11.78 0.00 908.55
06/28/13 920.33 8.19 0.00 912.14
12/30/13 920.33 10.36 0.00 909.97
06/27/14 920.33 9.75 0.00 910.58
12/30/14 920.33 11.07 0.00 909.26
06/12/15 920.33 9.68 0.00 910.65
12/17/15 920.33 6.85 0.00 913.48
06/21/16 920.33 7.72 0.00 912.61
12/20/16 920.33 12.26 0.00 908.07
06/13/17 920.33 7.08 0.00 913.25
12/05/17 920.33 13.01 0.00 907.32
03/13/19 920.33 4.50 0.00 915.83
06/12/19 920.33 5.32 0.00 915.01
09/11/19 920.33 8.18 0.00 912.15
12/20/19 920.33 5.80 0.00 914.53
03/04/20 920.33 5.23 0.00 915.10
06/03/20 920.33 3.98 0.00 916.35
09/14/20 920.33 8.48 0.00 911.85
12/09/20 920.33 5.92 0.00 914.41
04/28/09 920.39 8.65 0.00 911.74
06/30/09 920.39 8.53 0.00 911.86
11/30/09 920.39 8.27 0.00 912.12
03/25/10 920.39 7.26 0.00 913.13
06/23/10 920.39 9.76 0.00 910.63
09/29/10 920.39 12.05 0.00 908.34
12/28/10 920.39 12.70 0.00 907.69
06/30/11 920.39 9.55 0.00 910.84
09/29/11 920.39 9.22 0.00 911.17
12/20/11 920.39 9.00 0.00 911.39
03/29/12 920.39 8.32 0.00 912.07
06/28/12 920.39 11.18 0.00 909.21
09/26/12 920.39 10.17 0.00 910.22
12/03/12 920.39 12.55 0.00 907.84
06/28/13 920.39 8.32 0.00 912.07
12/30/13 920.39 10.57 0.00 909.82
06/27/14 920.39 11.17 0.00 909.22
12/30/14 920.39 11.87 0.00 908.52
06/12/15 920.39 11.14 0.00 909.25
12/17/15 920.39 7.75 0.00 912.64
03/09/16 920.39 6.40 0.00 913.99
06/21/16 920.39 7.89 0.00 912.50
12/20/16 920.39 12.44 0.00 907.95
03/21/17 920.39 10.65 0.00 909.74
06/13/17 920.39 6.99 0.00 913.40
12/05/17 920.39 13.22 0.00 907.17
12/18/18 920.39 4.02 0.00 916.37
03/13/19 920.39 5.12 0.00 915.27
06/12/19 920.39 5.79 0.00 914.60
09/11/19 920.39 8.60 0.00 911.79
12/20/19 920.39 6.55 0.00 913.84
03/04/20 920.39 5.68 0.00 914.71
06/03/20 920.39 4.48 0.00 915.91
09/14/20 920.39 8.76 0.00 911.63
12/09/20 920.39 6.42 0.00 913.97
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
DPE-10
DPE-11
Page 10 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
DPE-12 06/28/04 921.33
DPE-13 06/28/04 920.91
04/28/09 919.98 6.27 0.00 913.71
06/30/09 919.98 5.97 0.00 914.01
08/31/09 919.98 9.40 0.00 910.58
11/30/09 919.98 6.58 0.00 913.40
03/25/10 919.98 6.38 0.00 913.60
06/23/10 919.98 6.30 0.00 913.68
09/29/10 919.98 10.40 0.00 909.58
12/28/10 919.98 8.75 0.00 911.23
06/30/11 919.98 8.22 0.00 911.76
09/29/11 919.98 7.84 0.00 912.14
12/20/11 919.98 6.58 0.00 913.40
03/29/12 919.98 4.57 0.00 915.41
06/28/12 919.98 6.70 0.00 913.28
09/26/12 919.98 6.30 0.00 913.68
12/03/12 919.98 8.25 0.00 911.73
06/28/13 919.98 5.01 0.00 914.97
12/30/13 919.98 7.20 0.00 912.78
06/27/14 919.98 6.67 0.00 913.31
12/30/14 919.98 7.73 0.00 912.25
06/12/15 919.98 6.60 0.00 913.38
12/17/15 919.98 6.28 0.00 913.70
03/09/16 919.98 6.22 0.00 913.76
06/21/16 919.98 7.55 0.00 912.43
12/20/16 919.98 9.89 0.00 910.09
03/21/17 919.98 6.98 0.00 913.00
06/13/17 919.98 6.18 0.00 913.80
12/05/17 919.98 6.02 0.00 913.96
09/11/18 919.98 6.38 0.00 913.60
12/18/18 919.98 5.63 0.00 914.35
03/13/19 919.98 6.03 0.00 913.95
06/12/19 919.98 6.15 0.00 913.83
09/11/19 919.98 6.65 0.00 913.33
12/20/19 919.98 6.75 0.00 913.23
03/04/20 919.98 6.38 0.00 913.60
06/03/20 919.98 5.88 0.00 914.10
09/14/20 919.98 7.05 0.00 912.93
12/09/20 919.98 6.39 0.00 913.59
DPE-15 06/28/04 920.41
DPE-16 12/02/97 923.03 13.18 0.00 909.85
DPE-17 04/28/09 922.77 8.00 0.00 914.77
04/28/09 923.71 9.70 0.00 914.01
06/30/09 923.71 9.59 0.00 914.12
08/31/09 923.71 12.91 0.00 910.80
12/20/11 923.71 10.10 0.00 913.61
03/29/12 923.71 10.25 0.00 913.46
06/28/12 923.71 12.32 0.00 911.39
12/03/12 923.71 13.15 0.00 910.56
06/28/13 923.71 9.06 0.00 914.65
12/30/13 923.71 11.22 0.00 912.49
06/27/14 923.71 12.29 0.00 911.42
12/30/14 923.71 12.74 0.00 910.97
06/12/15 923.71 12.17 0.00 911.54
12/17/15 923.71
06/21/16 923.71 8.80 0.00 914.91
12/20/16 923.71 12.83 0.00 910.88
06/13/17 923.71 8.57 0.00 915.14
12/05/17 923.71 13.75 0.00 909.96
09/11/18 923.71 8.70 0.00 915.01
12/18/18 923.71 4.63 0.00 919.08
03/13/19 923.71 5.52 0.00 918.19
06/12/19 923.71 6.60 0.00 917.11
09/11/19 923.71 9.43 0.00 914.28
12/20/19 923.71 6.60 0.00 917.11
03/04/20 923.71 6.23 0.00 917.48
06/03/20 923.71 5.00 0.00 918.71
09/14/20 923.71 9.46 0.00 914.25
12/09/20 923.71 6.91 0.00 916.80
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
DPE-14
DPE-18
Sparge well - no longer measured
Sparge well - no longer measured
Sparge well - no longer measured
Well under water
Page 11 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 924.13 7.25 0.00 916.88
06/30/09 924.13 9.53 0.00 914.60
08/31/09 924.13 13.27 0.00 910.86
12/20/11 924.13 9.92 0.00 914.21
03/29/12 924.13 9.95 0.00 914.18
06/28/12 924.13 12.11 0.00 912.02
12/03/12 924.13 13.84 0.00 910.29
06/28/13 924.13 10.06 0.00 914.07
12/30/13 924.13 12.27 0.00 911.86
06/27/14 924.13 12.10 0.00 912.03
12/30/14 924.13 13.06 0.00 911.07
06/12/15 924.13 11.99 0.00 912.14
12/17/15 924.13
06/21/16 924.13 9.59 0.00 914.54
12/20/16 924.13 13.50 0.00 910.63
06/13/17 924.13
12/05/17 924.13
09/11/18 924.13 9.07 0.00 915.06
12/18/18 924.13 4.80 0.00 919.33
03/13/19 924.13 5.74 0.00 918.39
06/12/19 924.13 6.95 0.00 917.18
09/11/19 924.13 9.00 0.00 915.13
12/20/19 924.13 6.92 0.00 917.21
03/04/20 924.13 6.44 0.00 917.69
06/03/20 924.13 5.23 0.00 918.90
09/14/20 924.13 9.65 0.00 914.48
12/09/20 924.13 7.15 0.00 916.98
04/28/09 924.07 9.35 0.00 914.72
06/30/09 924.07 9.49 0.00 914.58
08/31/09 924.07 13.16 0.00 910.91
11/30/09 924.07 9.20 0.00 914.87
03/25/10 924.07 8.57 0.00 915.50
06/23/10 924.07 10.80 0.00 913.27
09/29/10 924.07 12.70 0.00 911.37
12/28/10 924.07 13.25 0.00 910.82
06/30/11 924.07 10.97 0.00 913.10
09/29/11 924.07 10.34 0.00 913.73
12/20/11 924.07 9.75 0.00 914.32
03/29/12 924.07 9.61 0.00 914.46
06/28/12 924.07 12.07 0.00 912.00
09/26/12 924.07 11.52 0.00 912.55
12/03/12 924.07 13.56 0.00 910.51
06/28/13 924.07 9.97 0.00 914.10
12/30/13 924.07 12.11 0.00 911.96
06/27/14 924.07 12.07 0.00 912.00
12/30/14 924.07 12.84 0.00 911.23
06/12/15 924.07 11.74 0.00 912.33
12/17/15 924.07 8.17 0.00 915.90
03/09/16 924.07 6.90 0.00 917.17
06/21/16 924.07 8.11 0.00 915.96
12/20/16 924.07 12.62 0.00 911.45
03/21/17 924.07 10.91 0.00 913.16
06/13/17 924.07 8.30 0.00 915.77
12/05/17 924.07 13.48 0.00 910.59
09/11/18 924.07 9.00 0.00 915.07
12/18/18 924.07 5.00 0.00 919.07
03/13/19 924.07 5.60 0.00 918.47
06/12/19 924.07 6.92 0.00 917.15
09/11/19 924.07 9.39 0.00 914.68
12/20/19 924.07 6.78 0.00 917.29
03/04/20 924.07 6.19 0.00 917.88
06/03/20 924.07 5.12 0.00 918.95
09/14/20 924.07 9.44 0.00 914.63
12/09/20 924.07 6.88 0.00 917.19
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
DPE-19
DPE-20
Equipment obstruction of well
Unable to Locate
Unable to Locate
Page 12 of 13
TABLE 2
HISTORICAL GROUNDWATER ELEVATION DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well ID Date Measured Top of Casing
Elevation (ft)
Depth to
Groundwater (ft)
LNAPL
Thickness (ft)
Groundwater
Elevation (ft)
04/28/09 922.89 2.28 0.00 920.61
06/30/09 922.89 7.57 0.00 915.32
04/28/09 921.76 6.61 0.00 915.15
06/30/09 921.76 7.21 0.00 914.55
08/31/09 921.76 10.84 0.00 910.92
11/30/09 921.76 6.96 0.00 914.80
03/25/10 921.76 5.94 0.00 915.82
06/23/10 921.76 7.68 0.00 914.08
09/29/10 921.76 10.28 0.00 911.48
12/28/10 921.76 9.26 0.00 912.50
06/30/11 921.76 8.81 0.00 912.95
09/29/11 921.76 8.21 0.00 913.55
12/20/11 921.76 7.57 0.00 914.19
03/29/12 921.76 6.56 0.00 915.20
06/28/12 921.76 9.60 0.00 912.16
09/26/12 921.76 9.00 0.00 912.76
12/03/12 921.76 10.45 0.00 911.31
06/28/13 921.76 7.09 0.00 914.67
12/30/13 921.76 9.28 0.00 912.48
06/27/14 921.76 9.60 0.00 912.16
12/30/14 921.76 10.03 0.00 911.73
06/12/15 921.76 9.43 0.00 912.33
12/17/15 921.76 6.91 0.00 914.85
03/09/16 921.76 5.55 0.00 916.21
06/21/16 921.76 7.80 0.00 913.96
03/04/04 921.57 7.40 0.00 914.36
03/21/17 921.76 9.24 0.00 912.52
06/13/17 921.76 7.36 0.00 914.40
12/05/17 921.76 11.76 0.00 910.00
09/11/18 921.76 8.24 0.00 913.52
12/18/18 921.76 4.50 0.00 917.26
03/13/19 921.76 4.81 0.00 916.95
06/12/19 921.76 6.64 0.00 915.12
09/11/19 921.76 8.30 0.00 913.46
12/20/19 921.76 5.82 0.00 915.94
03/04/20 921.76 5.00 0.00 916.76
06/03/20 921.76 4.68 0.00 917.08
09/14/20 921.76 8.24 0.00 913.52
12/09/20 921.76 5.44 0.00 916.32
DPE-23 06/28/04 921.57
PZ-1 12/02/97 924.25 13.93 0.00 910.32
PZ-2 12/02/97 924.22 13.78 0.00 910.44
PZ-3 12/02/97 923.73 13.47 0.00 910.26
PZ-4 12/02/97 923.84 14.10 0.00 909.74
Notes:
This table either only shows data dating back to 2009 or shows the last gauging event on the well if it was before 2009.
LNAPL - Light Non-Aqueous Phase Liquid
DPE-21
DPE-22
Sparge well - no longer measured
Page 13 of 13
TABLE 3
GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
3/27/2018 <1.0 <1.0 <1.0 <2.0 14.1
6/7/2018 <1.0 <1.0 <1.0 <2.0 16.9
9/11/2018 <1.0 <1.0 <1.0 <2.0 45.0
12/18/2018 <1.0 <1.0 <1.0 <2.0 20.6
3/13/2019 <1.0 <1.0 <1.0 <2.0 12.4
6/12/2019 <1.0 <1.0 <1.0 <2.0 31.5
9/11/2019 <1.0 <1.0 <1.0 <2.0 28.8
12/20/2019 <1.0 <1.0 <1.0 <2.0 21.2
3/4/2020 <1.0 <1.0 <1.0 <2.0 42.6
6/3/2020 <1.0 <1.0 <1.0 <2.0 44.8
9/14/2020 <1.0 <1.0 <1.0 <2.0 34.8
12/9/2020 <1.0 <1.0 <1.0 <2.0 21.7
3/27/2018 128 1.2 16.1 9.6 41.1
6/7/2018 172 <1.0 22.7 14.0 54.0
9/11/2018 30.8 <1.0 1.4 2.7 55.5
12/18/2018 5.2 <1.0 <1.0 <2.0 86.4
3/13/2019 157 <1.0 <1.0 <2.0 57.2
6/12/2019 49.5 <1.0 2.7 2.2 61.7
9/11/2019 25.7 1.2 2.3 <2.0 56.6
12/20/2019 29.3 <1.0 2.7 <2.0 69.4
3/4/2020 75.5 <1.0 <1.0 <2.0 69.4
6/3/2020 87.8 <1.0 3.4 2.3 65.8
9/14/2020 24.5 <1.0 <1.0 <2.0 56.0
12/9/2020 15.1 <1.0 1.8 <2.0 63.9
3/27/2018 <1.0 <1.0 <1.0 <2.0 <1.0
6/7/2018 <1.0 <1.0 <1.0 <2.0 <1.0
9/11/2018 <1.0 <1.0 <1.0 <2.0 <1.0
12/18/2018 <1.0 <1.0 <1.0 <2.0 <1.0
3/13/2019 <1.0 <1.0 <1.0 <2.0 <1.0
6/12/2019 <1.0 <1.0 <1.0 <2.0 <1.0
9/11/2019 <1.0 <1.0 <1.0 <2.0 <1.0
12/20/2019 <1.0 <1.0 <1.0 <2.0 <1.0
3/4/2020 <1.0 <1.0 <1.0 <2.0 <1.0
6/3/2020 <1.0 <1.0 <1.0 <2.0 <1.0
9/14/2020 <1.0 <1.0 <1.0 <2.0 <1.0
12/9/2020 <1.0 <1.0 <1.0 <2.0 <1.0
1 600 600 500 20
1.19 11 68 670 19
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L).
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by North Carolina Department of Environmental Quality.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. 2B Standard = Applicable Title 15A NCAC 02B Surface Water Standards;
lowest of the Freshwater, Water Supply, or Human Health Standards.
8. Shaded cells indicate concentration exceeds 2B Standard by a factor of 10.
Total Xylenes MTBEWELL I.D.SAMPLE
DATE Benzene Toluene Ethylbenzene
MW-11
2L Standards
GCLs
2B Standards
MW-13
MW-12
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
03/06/90 <1.0 <1.0 <1.0 <1.0 NA
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 73
10/18/95 <1.0 <1.0 <1.0 <1.0 69
01/30/96 <1.0 <1.0 <1.0 <1.0 88
04/19/96 <1.0 <1.0 <1.0 <1.0 84
08/14/96 <1.0 <1.0 <1.0 <1.0 100
10/03/96 <1.0 <1.0 <1.0 <1.0 72
01/24/97 <1.0 <1.0 <1.0 <1.0 92
03/06/90 <1.0 <1.0 <1.0 <1.0 NA
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 <1.0
10/18/95 <1.0 <1.0 <1.0 <1.0 <1.0
01/30/96 <1.0 <1.0 <1.0 <1.0 <1.0
04/19/96 <1.0 <1.0 <1.0 <1.0 <1.0
08/14/96 <1.0 <1.0 <1.0 <1.0 <1.0
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
03/06/90 <1.0 <1.0 <1.0 <1.0 NA
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 <1.0
10/18/95 <1.0 <1.0 <1.0 <1.0 <1.0
01/30/96 <1.0 <1.0 <1.0 <1.0 <1.0
04/19/96 <1.0 <1.0 <1.0 <1.0 <1.0
08/14/96 <1.0 <1.0 <1.0 <1.0 <1.0
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
03/06/90 <1.0 <1.0 <1.0 <1.0 NA
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 <1.0
10/18/95 <1.0 <1.0 <1.0 <1.0 <1.0
01/30/96 <1.0 <1.0 <1.0 <1.0 <1.0
04/19/96 <1.0 <1.0 <1.0 <1.0 <1.0
08/14/96 <1.0 <1.0 <1.0 <1.0 <1.0
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
03/06/90 <1.0 <1.0 <1.0 <1.0 NA
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 6.3 <1.0 <1.0 <1.0 <1.0
10/18/95 6.3 <1.0 <1.0 <1.0 <1.0
01/30/96 10 <1.0 <1.0 <1.0 <1.0
04/19/96 4.1 <1.0 <1.0 <1.0 <1.0
08/14/96 1.1 <1.0 <1.0 <1.0 <1.0
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
03/06/90 <1.0 <1.0 <1.0 <1.0 NA
08/04/90 7 5 <2.0 6 NA
07/28/95 13 <1.0 <1.0 <1.0 1.2
10/18/95 28 <1.0 <1.0 1.1 1.3
01/30/96 10 <1.0 <1.0 <1.0 <1.0
04/19/96 3 <1.0 <1.0 <1.0 <1.0
08/14/96 2.3 <1.0 <1.0 <1.0 <1.0
10/03/96 1.2 <1.0 <1.0 <1.0 <1.0
01/24/97 2.4 <1.0 <1.0 <1.0 <1.0
12/21/00 <1.0 <1.0 <1.0 <1.0 <1.0
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
MW-6
MW-1
MW-2
MW-3
MW-4
MW-5
2L Standards
GCLs
Page 1 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
03/06/90 2,430 5,950 1,490 8,540 NA
08/04/90 1,515 2,125 <2.0 3,512 NA
07/28/95 870 33 21 250 220
10/18/95 680 <1.0 35 840 110
01/30/96 380 <1.0 <1.0 84 80
04/19/96 290 <1.0 <1.0 140 58
08/14/96 590 <10.0 12 360 84
10/03/96 290 <5.0 <5.0 80 49
01/24/97 250 <5.0 <5.0 7.7 42
06/25/97 66 <1.0 <1.0 6 19
09/10/97 600 <20 24 630 99
12/03/97 66 1.6 1.3 170 43
03/03/98 5.1 <1.0 <1.0 13 15
06/12/98 6.4 <1.0 <1.0 13 7.9
09/17/98 5.7 <1.0 <1.0 3.4 6.7
12/11/98 95 <10 15 61 26
04/26/99 2.9 <1.0 <1.0 <1.0 2.7
06/25/99 45 <1.0 1.6 39 6.8
09/21/99 <1.0 <1.0 <1.0 <1.0 <1.0
12/29/99 <1.0 <1.0 <1.0 <1.0 <1.0
03/21/00 <1.0 <1.0 <1.0 <1.0 <1.0
06/15/00 1.5 <1.0 <1.0 <1.0 <1.0
12/21/00 1.5 <1.0 <1.0 <1.0 6.4
06/07/01 4.7 <1.0 <1.0 <1.0 4.8
12/03/01 32 <1.0 <1.0 11 13
06/20/02 11 <1.0 <1.0 3.4 11
12/11/02 <1.0 <1.0 <1.0 <2.0 <1.0
06/04/03 <5.0 <5.0 <5.0 <5.0 <5.0
12/10/03 <1.0 <1.0 <1.0 <2.0 1.4
03/04/04 <1.0 <1.0 <1.0 <2.0 2.7
06/29/04 <1.0 <1.0 <1.0 <2.0 1.7
09/21/04 <1.0 <1.0 <1.0 <2.0 1
11/11/04 <1.0 <1.0 <1.0 <2.0 <1.0
03/15/05 <1.0 <1.0 <1.0 <2.0 <1.0
11/30/05 <1.0 <1.0 <1.0 <3.0 <1.0
05/25/06 <1.0 <1.0 <1.0 <3.0 1.7
11/29/06 <1.0 <1.0 <1.0 <3.0 3.7
05/18/07 <1.0 <1.0 <1.0 <3.0 4.7
10/16/07 <1.0 <1.0 <1.0 <3.0 5
10/23/08 <5.0 <5.0 <5.0 <5.0 NA
03/06/90 <1.0 <1.0 <1.0 <1.0 NA
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 <1.0
10/18/95 <1.0 <1.0 <1.0 <1.0 <1.0
01/30/96 <1.0 <1.0 <1.0 <1.0 <1.0
04/19/96 <1.0 <1.0 <1.0 <1.0 <1.0
08/14/96 <1.0 <1.0 <1.0 <1.0 <1.0
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 3.1 <1.0 <1.0 4.4 <1.0
10/18/95 <1.0 <1.0 <1.0 1.9 <1.0
01/30/96 5.2 <1.0 <1.0 23 <1.0
04/19/96 3.5 <1.0 <1.0 12 <1.0
08/14/96 <1.0 <1.0 <1.0 <1.0 <1.0
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
MW-7
MW-8
MW-9
2L Standards
GCLs
Page 2 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
08/04/90 12 11 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 27
01/30/96 5.1 <1.0 <1.0 <1.0 43
04/19/96 5 <1.0 <1.0 <1.0 39
08/14/96 <1.0 <1.0 <1.0 <1.0 2.8
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 1.3 <1.0 <1.0 <1.0 28
12/21/00 <1.0 <1.0 <1.0 <1.0 48
08/04/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 57
10/18/95 <1.0 <1.0 <1.0 <1.0 64
01/30/96 1.4 <1.0 <1.0 1.1 <1.0
04/19/96 <1.0 <1.0 <1.0 <1.0 95
08/14/96 <5.0 <5.0 <5.0 <5.0 520
10/03/96 <1.0 <1.0 <1.0 <1.0 360
01/24/97 <5.0 <5.0 <5.0 <5.0 250
06/25/97 <1.0 <1.0 <1.0 <1.0 170
09/10/97 <1.0 <1.0 <1.0 <1.0 630
12/03/97 <1.0 <1.0 <1.0 <1.0 170
03/03/98 <2.0 <2.0 <2.0 <2.0 170
06/12/98 <2.5 <2.5 <2.5 <2.5 230
09/17/98 <1.0 <1.0 <1.0 <1.0 250
12/11/98 <20 <20 <20 <20 360
04/26/99 <1.0 <1.0 <1.0 <1.0 310
06/25/99 220 290 56 250 <10
09/21/99 <5.0 <5.0 <5.0 <5.0 270
12/29/99 <10 <10 <10 <10 350
03/21/00 <10 <10 <10 <10 390
06/15/00 <20 <20 <20 <20 510
12/21/00 <10 <10 <10 <10 810
06/07/01 <10 <10 <10 <10 700
12/03/01 <10 <10 <10 <20 1,100
06/20/02 <10 <10 <10 <20 1,100
12/11/02 <10 <10 <10 <20 980
06/04/03 <5 <5 <5 <5 1,400
12/10/03 <25 <25 <25 <50 1,400
03/04/04 <10 <10 <10 <20 1,600
06/29/04 <25 <25 <25 <50 1,100
09/21/04 <20 <20 <20 <40 1,400
11/11/04 <20 <20 <20 <40 510
03/15/05 <2.0 <2.0 <2.0 4.5 160
11/30/05 <2.0 <2.0 <2.0 <6.0 310
05/25/06 <5.0 <5.0 <5.0 <15 110
11/29/06 <1.0 <1.0 <1.0 <3.0 490
05/18/07 <10.0 <10.0 <10.0 <10.0 <10.0
10/23/08 <5.0 <5.0 <5.0 <5.0 NA
03/25/10 <1 <5 <5 <5 <5
06/23/10 <1 <5 <5 <5 <5
09/29/10 <1 <5 <5 <5 <5
12/29/10 <1 <5 <5 <5 <5
03/24/11 <1 <5 <5 <5 <5
06/30/11 <1 <5 <5 <5 <5
09/29/11 <0.5 <0.7 <0.8 <0.8 0.7J
12/20/11 <0.5 <0.7 <0.8 <0.8 0.7J
03/29/12 <0.5 <0.7 <0.8 <0.8 0.9J
06/28/12 <0.5 <0.7 <0.8 <0.8 0.9J
09/26/12 <0.5 <0.7 <0.8 <0.8 0.5J
12/03/12 <0.5 <0.7 <0.8 <0.8 0.7J
03/28/13 <0.5 <0.7 <0.8 <0.8 1J
06/28/13 <0.5 <0.7 <0.8 <0.8 0.9J
09/04/13 <0.5 <0.7 <0.8 <0.8 2J
12/30/13 <0.5 <0.7 <0.8 <0.8 2J
03/31/14 <0.5 <0.5 <0.5 <0.5 11
06/27/14 <0.5 <0.5 <0.5 <0.5 10
09/16/14 <0.5 <0.5 <0.5 <0.5 3
12/30/14 <0.5 <0.5 <0.5 <0.5 2
03/31/15 <0.5 <0.5 <0.5 <0.5 10
06/12/15 <0.5 <0.5 <0.5 <0.5 24
09/17/15 <0.5 <0.5 <0.5 <0.5 31
12/17/15 <0.5 <0.5 <0.5 <0.5 30
03/09/16 <0.5 <0.5 <0.5 <0.5 18
06/21/16 <0.5 <0.5 <0.5 <0.5 52
09/29/16 <0.5 <0.5 <0.5 <0.5 39
12/20/16 <0.5 <0.5 <0.5 <0.5 48
03/21/17 <1.0 <1.0 <1.0 <2.0 4.9
06/13/17 <1.0 <1.0 <1.0 <2.0 30.3
09/20/17 <1.0 <1.0 <1.0 <2.0 55.6
12/05/17 <1.0 <1.0 <1.0 <2.0 57.7
03/27/18 <1.0 <1.0 <1.0 <2.0 14.1
06/07/18 <1.0 <1.0 <1.0 <2.0 16.9
09/11/18 <1.0 <1.0 <1.0 <2.0 45.0
12/18/2018 <1.0 <1.0 <1.0 <2.0 20.6
3/13/2019 <1.0 <1.0 <1.0 <2.0 12.4
6/12/2019 <1.0 <1.0 <1.0 <2.0 31.5
9/11/2019 <1.0 <1.0 <1.0 <2.0 28.8
12/20/2019 <1.0 <1.0 <1.0 <2.0 21.2
3/4/2020 <1.0 <1.0 <1.0 <2.0 42.6
6/3/2020 <1.0 <1.0 <1.0 <2.0 44.8
9/14/2020 <1.0 <1.0 <1.0 <2.0 34.8
12/9/2020 <1.0 <1.0 <1.0 <2.0 21.7
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
MW-11
MW-10
2L Standards
GCLs
Page 3 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
08/04/90 3,445 375 <2.0 4,345 NA
01/30/96 560 <1.0 <1.0 32 <1.0
01/24/97 7.4 <1.0 <1.0 2.4 7.8
06/25/97 69 <1.0 6.2 15 9.7
03/03/98 87 <1.0 <1.0 <1.0 2.3
04/26/99 5.2 <1.0 <1.0 <1.0 4.3
06/25/99 4.5 <1.0 <1.0 <1.0 6.7
12/29/99 <1.0 <1.0 <1.0 <1.0 6.4
03/21/00 29 <1.0 4.3 11 14
06/15/00 230 <5.0 110 56 80
12/21/00 <1.0 <1.0 <1.0 1.7 21
06/07/01 43 <1.0 53 13 50
12/03/01 <1.0 <1.0 <1.0 <2.0 35
06/20/02 <1.0 <1.0 <1.0 <2.0 20
12/11/02 <1.0 <1.0 <1.0 <2.0 16
06/04/03 280 <5.0 <5.0 7 20
12/10/03 100 <1.0 <1.0 <2.0 25
03/04/04 78 <1.0 1.5 <2.0 31
06/29/04 28 <1.0 <1.0 <2.0 30
09/21/04 79 <1.0 <1.0 2.2 32
11/11/04 4.7 <1.0 <1.0 <2.0 19
03/15/05 10 <1.0 <1.0 <2.0 24
11/30/05 <1.0 <1.0 <1.0 <3.0 24
05/25/06 10 <1.0 1.5 <3.0 20
11/29/06 4.4 <1.0 1.4 <3.0 26
05/18/07 160 1.1 54 67 42
10/16/07 1.1 <1.0 <1.0 <3.0 33
10/23/08 11 <5.0 <5.0 <5.0 NA
04/28/09 162 <5.0 62.1 58.5 43.6
06/30/09 34 1.2 6.4 <5.0 33
11/30/09 4.3 <5 <5 <5 36
03/25/10 47 <5 <5 <5 44
06/23/10 270 <5 84 82 60
09/29/10 6.5 <5 <5 <5 46
12/29/10 3.7 <5 <5 <5 42
03/24/11 230 <5 74 65 44
06/30/11 220 <5 100 56 54
09/29/11 6 <0.7 4 <0.8 40
12/20/11 170 1 47 31 38
03/29/12 480 3 170 140 50
06/28/12 190 0.8 99 41 57
09/26/12 17 <0.7 13 4 46
12/03/12 9 <0.7 2 <0.8 46
03/28/13 170 <0.7 26 14 50
06/28/13 92 <0.7 16 12 47
09/04/13 28 <0.7 3J 2J 49
12/30/13 9 <0.7 2J 3J 47
03/31/14 37 <0.5 0.8J 1 64
06/27/14 200 2 33 29 55
09/16/14 12 <0.5 2 2 14
12/30/14 22 <0.5 11 6 52
03/31/15 89 <0.5 12 6 51
06/12/15 180 <0.5 19 11 41
09/17/15 54 <0.5 3 <0.5 46
12/17/15 34 <0.5 3 3 46
03/09/16 13 <0.5 0.8 J 0.6 J 66
06/21/16 100 <0.5 12 8 59
09/29/16 40 <0.5 2 1 60
12/20/16 9 <0.5 0.6 J 0.6 J 61
03/21/17 195 <1.0 37.3 24.2 42.1
06/13/17 47.1 <1.0 7.9 5.2 50.2
09/20/17 10.6 <1.0 <1.0 <2.0 69.4
12/05/17 3.0 <1.0 <1.0 <2.0 67.1
03/27/18 128 1.2 16.1 9.6 41.1
06/07/18 172 <1.0 22.7 14.0 54.0
09/11/18 30.8 <1.0 1.4 2.7 55.5
12/18/2018 5.2 <1.0 <1.0 <2.0 86.4
3/13/2019 157 <1.0 <1.0 <2.0 57.2
6/12/2019 49.5 <1.0 2.7 2.2 61.7
9/11/2019 25.7 1.2 2.3 <2.0 56.6
12/20/2019 29.3 <1.0 2.7 <2.0 69.4
3/4/2020 75.5 <1.0 <1.0 <2.0 69.4
6/3/2020 87.8 <1.0 3.4 2.3 65.8
9/14/2020 24.5 <1.0 <1.0 <2.0 56.0
12/9/2020 15.1 <1.0 1.8 <2.0 63.9
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
MW-12
2L Standards
GCLs
Page 4 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
08/04/90 74 3 <2.0 37 NA
07/28/95 45 <1.0 <1.0 2.9 29
10/18/95 160 <1.0 1.1 11 42
01/30/96 33 <1.0 <1.0 1.1 18
04/19/96 320 <1.0 <1.0 17 40
08/14/96 160 <2.0 <2.0 9.3 30
10/03/96 240 <1.0 5.9 23 29
01/24/97 320 <5.0 <5.0 13 50
06/25/97 610 <10 <10 27 88
09/10/97 980 <25 <25 49 160
12/03/97 390 <10 <10 30 120
03/03/98 540 <10 <10 35 150
06/12/98 530 <10 <10 27 270
09/17/98 730 <10 <10 49 150
12/11/98 1,000 <50 <50 34 *150
04/26/99 560 <20 <20 38 290
06/25/99 680 <20 <20 40 310
09/21/99 670 <10 14 27 290
12/29/99 280 <10 <10 <10 170
03/21/00 220 <5.0 <5.0 12 93
06/15/00 610 <20 <20 <20 29
12/21/00 150 <5.0 <5.0 <5.0 130
06/07/01 220 <5.0 <5.0 <5.0 99
12/03/01 260 <5.0 <5.0 <10 85
06/20/02 170 <5.0 <5.0 <10 120
12/11/02 13 <5.0 <5.0 <10 17
06/04/03 35 <5.0 <5.0 <5 29
12/10/03 69 <2.0 <2.0 <4 48
03/04/04 110 <5.0 <5.0 <10 83
06/29/04 87 <1.0 <1.0 2.3 65
09/21/04 53 <1.0 <1.0 <2.0 60
11/11/04 56 <1.0 <1.0 <2.0 40
03/15/05 31 <1.0 <1.0 2 27
11/30/05 2 <1.0 <1.0 <3.0 12
05/25/06 <1.0 <1.0 <1.0 <3.0 9
11/29/06 <1.0 <1.0 <1.0 <3.0 3.4
05/18/07 <1.0 <1.0 <1.0 <3.0 3.9
10/16/07 4.3 <1.0 <1.0 <3.0 4.8
10/23/08 <5.0 <5.0 <5.0 <5.0 NA
03/25/10 <1 <5 <5 <5 <5
06/24/10 <1 <5 <5 <5 <5
09/29/10 <1 <5 <5 <5 <5
12/29/10 <1 <5 <5 <5 <5
03/24/11 <1 <5 <5 <5 <5
06/30/11 <1 <5 <5 <5 <5
09/29/11 <0.5 <0.7 <0.8 <0.8 0.6J
12/20/11 <0.5 <0.7 <0.8 <0.8 0.6J
03/29/12 <0.5 <0.7 <0.8 <0.8 0.5J
06/28/12 <0.5 <0.7 <0.8 <0.8 0.6J
09/26/12 <0.5 <0.7 <0.8 <0.8 0.7J
12/03/12 <0.5 <0.7 <0.8 <0.8 0.7J
12/03/12 <0.5 <0.7 <0.8 <0.8 0.6J
06/28/13 <0.5 <0.7 <0.8 <0.8 <0.5
09/04/13 <0.5 <0.7 <0.8 <0.8 <0.5
12/30/13 <0.5 <0.7 <0.8 <0.8 <0.5
03/31/14 <0.5 <0.5 <0.5 <0.5 0.6J
06/27/14 <0.5 <0.5 <0.5 <0.5 <0.5
09/16/14 <0.5 <0.5 <0.5 <0.5 <0.5
12/30/14 <0.5 <0.5 <0.5 <0.5 <0.5
03/31/15 <0.5 <0.5 <0.5 <0.5 <0.5
06/12/15 <0.5 <0.5 <0.5 <0.5 <0.5
09/17/15 <0.5 <0.5 <0.5 <0.5 0.8 J
12/17/15 <0.5 <0.5 <0.5 <0.5 <0.5
03/09/16 <0.5 <0.5 <0.5 <0.5 <0.5
06/21/16 <0.5 <0.5 <0.5 <0.5 <0.5
09/29/16 <0.5 <0.5 <0.5 <0.5 <0.5
12/20/16 <0.5 <0.5 <0.5 <0.5 0.5 J
03/21/17 <1.0 <1.0 <1.0 <2.0 <1.0
06/13/17 <1.0 <1.0 <1.0 <2.0 <1.0
09/20/17 <1.0 <1.0 <1.0 <2.0 <1.0
12/05/17 <1.0 <1.0 <1.0 <2.0 <1.0
03/27/18 <1.0 <1.0 <1.0 <2.0 <1.0
06/07/18 <1.0 <1.0 <1.0 <2.0 <1.0
09/11/18 <1.0 <1.0 <1.0 <2.0 <1.0
12/18/2018 <1.0 <1.0 <1.0 <2.0 <1.0
3/13/2019 <1.0 <1.0 <1.0 <2.0 <1.0
6/12/2019 <1.0 <1.0 <1.0 <2.0 <1.0
9/11/2019 <1.0 <1.0 <1.0 <2.0 <1.0
12/20/2019 <1.0 <1.0 <1.0 <2.0 <1.0
3/4/2020 <1.0 <1.0 <1.0 <2.0 <1.0
6/3/2020 <1.0 <1.0 <1.0 <2.0 <1.0
9/14/2020 <1.0 <1.0 <1.0 <2.0 <1.0
12/9/2020 <1.0 <1.0 <1.0 <2.0 <1.0
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
MW-13
2L Standards
GCLs
Page 5 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
06/05/92 <1.0 <1.0 <1.0 2 <1.0
07/28/95 <1.0 <1.0 <1.0 1.4 <1.0
10/18/95 <1.0 <1.0 <1.0 <1.0 <1.0
01/30/96 <1.0 <1.0 <1.0 <1.0 <1.0
04/19/96 <1.0 <1.0 <1.0 <1.0 <1.0
08/14/96 <1.0 <1.0 <1.0 <1.0 1.6
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
06/25/97 <1.0 <1.0 <1.0 <1.0 1.1
09/10/97 <1.0 <1.0 <1.0 <1.0 <1.0
12/03/97 <1.0 <1.0 <1.0 <1.0 1.5
03/03/98 <1.0 <1.0 <1.0 <1.0 1.3
06/12/98 <1.0 <1.0 <1.0 <1.0 2.7
09/17/98 <1.0 <1.0 <1.0 <1.0 2.2
12/11/98 <1.0 <1.0 <1.0 <1.0 3.1
04/26/99 <1.0 <1.0 <1.0 <1.0 3.4
DUP-MW-14 04/26/99 <1.0 <1.0 <1.0 <1.0 3.4
06/25/99 <1.0 <1.0 <1.0 <1.0 3.4
09/21/99 <1.0 <1.0 <1.0 <1.0 2.5
12/29/99 <1.0 <1.0 <1.0 <1.0 2.3
03/21/00 <1.0 <1.0 <1.0 <1.0 2.3
06/15/00 <1.0 <1.0 <1.0 <1.0 <1.0
12/21/00 <1.0 <1.0 <1.0 <1.0 3.1
06/07/01 <1.0 <1.0 <1.0 <1.0 1.9
12/03/01 <1.0 <1.0 <1.0 <2.0 2.6
06/20/02 <1.0 <1.0 <1.0 <2.0 2.4
12/11/02 <1.0 <1.0 <1.0 <2.0 <1.0
06/04/03 <5.0 <5.0 <5.0 <5.0 <5.0
12/10/03 <1.0 <1.0 <1.0 <2 <1
03/04/04 <1.0 <1.0 <1.0 <2 <1
06/29/04 <1.0 <1.0 <1.0 <2 <1
09/21/04 <1.0 <1.0 <1.0 <2.0 <1.0
11/11/04 <1.0 <1.0 <1.0 <2.0 <1.0
03/15/05 <1.0 <1.0 <1.0 <2.0 <1.0
11/30/05 <1.0 <1.0 <1.0 <3.0 1.2
05/25/06 <1.0 <1.0 <1.0 <3.0 1.1
11/29/06 <1.0 <1.0 <1.0 <3.0 <1.0
05/18/07 <1.0 <1.0 <1.0 <3.0 <1.0
10/16/07 <1.0 <1.0 <1.0 <3.0 1.3
10/23/08 <5.0 <5.0 <5.0 <5.0 NA
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
MW-14
MW-14
2L Standards
GCLs
Page 6 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
06/05/92 <1.0 <1.0 <1.0 <1.0 <1.0
07/28/95 93 100 110 290 11
10/18/95 110 58 89 230 12
01/30/96 75 140 190 550 <1.0
04/19/96 29 79 110 320 <1.0
08/14/96 <50 87 220 640 <50
10/03/96
01/24/97 18 49 380 760 <10
06/25/97 29 53 72 140 <1.0
09/10/97 41 51 86 140 <5.0
12/03/97 20 22 11 36 <1.0
03/03/98 8.2 13 5 14 <1.0
06/12/98 13 12 3.2 9 <1.0
09/17/98 14 22 9.3 23 <1.0
12/11/98 66 140 28 99 <10
04/26/99
06/25/99 13 34 10 29 <1.0
09/21/99 7.7 15 7.8 10 <1.0
12/29/99 6.4 5.9 7.9 10 <1.0
03/21/00 4.7 14 5.6 15 <1.0
06/15/00 <1.0 <1.0 <1.0 <1.0 <1.0
12/21/00 3 4.2 6 9.9 <1.0
06/07/01 1.2 <1.0 3.2 2.7 <1.0
12/03/01 <1.0 <1.0 1.1 <2.0 <1.0
06/20/02 <1.0 <1.0 <1.0 <2.0 <1.0
12/11/02 <1.0 <1.0 <1.0 <2.0 <1.0
06/04/03 <5.0 <5.0 <5.0 <5.0 <5.0
12/10/03 <1.0 <1.0 <1.0 <2.0 <1.0
03/04/04 <1.0 <1.0 <1.0 <2.0 <1.0
06/29/04 <1.0 <1.0 <1.0 <2.0 <1.0
09/21/04 <1.0 <1.0 <1.0 <2.0 <1.0
11/11/04 <1.0 <1.0 <1.0 <2.0 <1.0
03/15/05 <1.0 <1.0 <1.0 <2.0 <1.0
11/30/05 <1.0 <1.0 <1.0 <3.0 <1.0
05/25/06 <1.0 <1.0 <1.0 <3.0 <1.0
11/28/06 <1.0 <1.0 <1.0 <3.0 <1.0
05/18/07 <1.0 <1.0 <1.0 <3.0 <1.0
10/16/07 <1.0 <1.0 <1.0 <3.0 <1.0
06/05/92 <1.0 <1.0 <1.0 <1.0 <1.0
10/18/95 <1.0 <1.0 <1.0 <1.0 <1.0
01/30/96 <1.0 <1.0 <1.0 <1.0 <1.0
04/19/96 <1.0 <1.0 <1.0 <1.0 <1.0
08/14/96 <1.0 <1.0 <1.0 <1.0 <1.0
10/03/96 <1.0 <1.0 <1.0 <1.0 <1.0
01/24/97 <1.0 <1.0 <1.0 <1.0 <1.0
06/25/97 <1.0 <1.0 <1.0 <1.0 <1.0
09/10/97 <1.0 <1.0 <1.0 <1.0 <1.0
12/03/97 <1.0 <1.0 <1.0 <1.0 <1.0
03/03/98 <1.0 <1.0 <1.0 <1.0 <1.0
06/12/98 <1.0 <1.0 <1.0 <1.0 <1.0
09/17/98 <1.0 <1.0 <1.0 <1.0 <1.0
12/11/98 <1.0 <1.0 <1.0 <1.0 <1.0
04/26/99 NA NA NA NA NA
06/25/99 <1.0 <1.0 <1.0 <1.0 <1.0
09/21/99 <1.0 <1.0 <1.0 <1.0 <1.0
12/29/99 <1.0 <1.0 <1.0 <1.0 <1.0
03/21/00 <1.0 <1.0 <1.0 <1.0 <1.0
06/15/00 <1.0 <1.0 <1.0 <1.0 <1.0
12/21/00 <1.0 <1.0 <1.0 <1.0 <1.0
06/07/01 <1.0 <1.0 <1.0 <1.0 <1.0
12/03/01 <1.0 <1.0 <1.0 <2.0 <1.0
06/20/02 <1.0 <1.0 <1.0 <2.0 <1.0
12/11/02 <1.0 <1.0 <1.0 <2.0 <1.0
06/04/03 <5.0 <5.0 <5.0 <5.0 <5.0
04/01/04
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
2L Standards
GCLs
HYDROCARBON SHEEN DETECTED - NO SAMPLES COLLECTED
HYDROCARBON SHEEN DETECTED - NO SAMPLES COLLECTED
ABANDONED
MW-15
MW-16
Page 7 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
09/24/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 <1.0 <1.0 <1.0 <1.0 20
10/18/95 <1.0 <1.0 <1.0 <1.0 31
01/30/96 <1.0 <1.0 <1.0 <1.0 32
04/19/96 <1.0 <1.0 <1.0 <1.0 30
08/14/96 <1.0 <1.0 <1.0 <1.0 28
10/03/96 <1.0 <1.0 <1.0 <1.0 25
01/24/97 <1.0 <1.0 <1.0 <1.0 26
09/24/90 <2.0 16 <2.0 29 NA
07/28/95 1.6 <1.0 <1.0 <1.0 <1.0
10/18/95 <1.0 <1.0 <1.0 <1.0 <1.0
01/30/96 <1.0 <1.0 <1.0 <1.0 <1.0
04/19/96 1.3 <1.0 <1.0 <1.0 <1.0
08/14/96 4.6 <1.0 <1.0 4 <1.0
10/03/96 9.3 <1.0 1.4 11 4
01/24/97 6.2 <1.0 1.2 7.3 <1.0
06/25/97 7.2 <1.0 <1.0 4.3 5.4
12/03/97 2.3 <1.0 <1.0 2.8 9.5
03/03/98 17 2.1 2.1 25 9.3
06/12/98 34 3 <1.0 110 12
09/17/98 3.2 <1.0 <1.0 4.4 9
09/17/98 3.5 <1.0 <1.0 4.3 9.1
12/11/98 1 <1.0 <1.0 <1.0 11
04/26/99 1 <1.0 <1.0 1.4 22
06/25/99 <1.0 <1.0 <1.0 <1.0 20
09/21/99 2 <1.0 <1.0 2.3 1.3
12/29/99 2.9 <1.0 1.2 5.8 3.3
03/21/00 <1.0 <1.0 <1.0 <1.0 8
06/15/00 <1.0 <1.0 <1.0 <1.0 20
12/21/00 <1.0 <1.0 <1.0 <1.0 11
06/07/01 <1.0 <1.0 <1.0 <1.0 9
12/03/01 <1.0 <1.0 <1.0 <2.0 13
06/20/02 <1.0 <1.0 <1.0 <2.0 5.6
Duplicate DW-2 06/20/02 <1.0 <1.0 <1.0 <2.0 6.2
DW-2 12/11/02 11 <1.0 6.3 32 <1.0
Duplicate DW-2 12/11/02 11 <1.0 6.1 31 <1.0
DW-2 06/04/03 17 <5.0 7 37 <5.0
Duplicate DW-2 06/04/03 19 <5.0 8 41 <5.0
DW-2 12/10/03 7.4 <1.0 4.2 20 <1.0
Duplicate DW-2 12/10/03 7.6 <1.0 4.2 22 <1.0
DW-2 03/04/04 24 1.9 17 76 <1.0
Duplicate DW-2 03/05/04 21 1.7 15 68 <1.0
06/29/04 <1.0 <1.0 <1.0 <2.0 3
09/21/04 <1.0 <1.0 <1.0 <2.0 <1
11/11/04 <1.0 <1.0 <1.0 <2.0 1.2
03/15/05 <1.0 <1.0 <1.0 <2.0 <1.0
11/30/05 <1.0 <1.0 <1.0 <3.0 <1.0
05/25/06 <1.0 <1.0 <1.0 <3.0 <1.0
11/28/06 <1.0 <1.0 <1.0 <3.0 <1.0
05/18/07 <1.0 <1.0 <1.0 <3.0 <1.0
10/16/07 <1.0 <1.0 <1.0 <3.0 <1.0
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
DW-2
2L Standards
GCLs
DW-1
DW-2
Page 8 of 9
TABLE 4
HISTORICAL GROUNDWATER ANALYTICAL DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Benzene Toluene Ethylbenzene Total Xylenes MTBE
09/24/90 <2.0 <2.0 <2.0 <6.0 NA
07/28/95 130 <1.0 <1.0 2.4 <1.0
10/18/95 150 <1.0 <1.0 3 <1.0
01/30/96 180 <1.0 <1.0 5.8 <1.0
04/19/96 98 <1.0 <1.0 <1.0 <1.0
08/14/96 110 <5.0 <5.0 <5.0 <5.0
10/03/96 110 <1.0 <1.0 4 <1.0
01/24/97 85 <1.0 <1.0 1.2 <1.0
06/25/97 65 <1.0 <1.0 <1.0 <1.0
09/10/97 11 <1.0 <1.0 <1.0 <1.0
12/03/97 33 <1.0 <1.0 1.5 <1.0
03/03/98 67 <1.0 <1.0 1.9 1
06/12/98 61 <1.0 <1.0 <1.0 1.5
09/17/98 100 <1.0 <1.0 1.5 1.4
12/11/98 <1.0 <1.0 <1.0 <1.0 <1.0
04/26/99 37 <1.0 <1.0 <1.0 3
06/25/99 71 <1.0 <1.0 <1.0 2
09/21/99 68 <2.0 <2.0 <2.0 <2.0
12/29/99 66 <2.5 <2.5 <2.5 <2.5
03/21/00 56 <1.0 <1.0 <1.0 1.5
06/15/00 69 <1.0 <1.0 <1.0 <1.0
12/21/00 56 <1.0 <1.0 <1.0 2
06/07/01 54 <1.0 <1.0 <1.0 1.6
12/03/01 40 <1.0 <1.0 <2.0 1.7
06/20/02 58 <1.0 <1.0 <2.0 1.7
12/11/02 57 <1.0 <1.0 <2.0 1.4
06/04/03 23 <5.0 <5.0 <5.0 <5.0
12/10/03 22 <1.0 <1.0 <2.0 <1.0
03/04/04 23 <1.0 <1.0 <2.0 <1.0
06/29/04 <1.0 <1.0 <1.0 <2.0 <1.0
09/21/04 <1.0 <1.0 <1.0 <2.0 <1.0
11/11/04 <1.0 <1.0 <1.0 <2.0 2.4
03/15/05 <1.0 <1.0 <1.0 <2.0 <1.0
11/30/05 <1.0 <1.0 <1.0 <3.0 <1.0
05/25/06 <1.0 <1.0 <1.0 <3.0 <1.0
11/28/06 <1.0 <1.0 <1.0 <3.0 <1.0
05/18/07 <1.0 <1.0 <1.0 <3.0 <1.0
10/16/07 <1.0 <1.0 <1.0 <3.0 <1.0
1 600 600 500 20
5,000 260,000 84,500 85,500 20,000
Notes:
1. All measurements are in micrograms per liter (ug/L)
2. "<" or ND = None detected above method detection limit.
3. 2L Standard = Title 15A NCAC 2L .0202 Groundwater Standard
4. GCL = Gross Contaminant Level established by NCDEQ.
5. MTBE = Methyl tertiary butyl ether
6. Values in BOLD indicate levels above 2L Groundwater Standards.
7. NA - Not analyzed or data not available
8. J = Concentration is greater than laboratory detection limit but below reporting limit.
DW-3
2L Standards
GCLs
Page 9 of 9
TABLE 5
NATURAL ATTENUATION PARAMETER DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Temperature
(° Celcius)
pH
(std. Units)
ORP
(mV)
Cond.
(mS/cm)
DO
(mg/L)
Turbidity
(NTU)
06/30/11 19.6 4.38 273 0.066 8.5 NM
09/29/11 21.7 5.07 193 0.127 6.3 NM
12/20/11 16.5 4.72 241 0.097 7.4 NM
03/29/12 14.8 6.85 130 0.058 5.7 NM
06/28/12 18.9 5.20 146 0.039 2.9 NM
09/26/12 21.1 5.00 137 0.066 7.4 NM
12/03/12 15.1 6.90 132 0.060 5.9 NM
06/28/13 18.2 5.40 179 0.073 6.3 NM
12/30/13 17.5 5.30 198 0.066 6.2 NM
06/27/14 18.6 5.30 148 0.038 2.4 NM
12/30/14 17.4 5.70 164 0.059 5.2 NM
06/12/15 18.5 6.10 107 0.041 2.1 NM
09/17/15 19.3 5.92 82 0.024 10.2 NM
12/17/15 17.4 5.49 234 0.052 7.4 NM
03/09/16 15.5 5.15 271 0.049 1.6 NM
06/21/16 17.8 6.31 94 0.051 3.3 NM
09/29/16 19.8 5.48 88 0.0404 2.5 NM
12/20/16 18.2 5.94 116 0.052 2.3 NM
03/21/17 17.7 5.59 148 0.042 5.1 NM
06/13/17 27.5 6.15 108 0.050 4.0 NM
09/20/17 19.3 5.72 92.7 0.0593 2.24 >1000
12/05/17 19.0 5.61 114.9 0.0552 1.39 >1000
03/27/18 13.8 6.36 101.6 0.044 6.17 NM
06/07/18 16.4 5.08 164.0 0.0386 2.57 out of range
09/11/18 22.5 4.62 209.5 0.0561 1.52 out of range
12/18/18 17.4 5.94 219.2 0.0598 1.94 out of range
03/13/19 15.5 5.94 188.0 0.0496 2.75 out of range
06/12/19 16.5 4.96 164.4 0.0567 3.56 NM
09/11/19 21.0 5.06 -31.1 0.0671 1.67 NM
12/20/19 17.2 5.71 11.7 0.0535 2.78 out of range
03/04/20 15.9 5.49 185.0 0.056 1.28 out of range
06/03/20 17.02 5.44 113.8 0.057 1.75 out of range
09/14/20 20.4 4.34 123.9 0.0592 1.55 out of range
12/09/20 18.39 5.52 88.9 0.053 3.06 out of range
06/30/11 20.3 6.95 49 3.2 0.2 NM
09/29/11 20.2 8.78 32 0.365 0.3 NM
12/20/11 16.8 7.86 28 0.682 0.2 NM
03/29/12 15.0 7.95 40 0.514 3.3 NM
06/28/12 19.7 6.00 0 0.280 1.4 NM
09/26/12 20.1 5.50 29 0.668 4.0 NM
12/03/12 15.3 7.70 34 0.582 3.6 NM
06/28/13 18.2 7.20 30 0.899 1.9 NM
12/30/13 18.0 7.13 28 0.516 1.3 NM
06/27/14 19.3 6.10 10 0.289 1.9 NM
12/30/14 17.7 7.00 25 0.572 2.2 NM
06/12/15 19.4 6.10 24 0.264 4.1 NM
09/17/15 18.5 9.36 -55 0.279 9.5 NM
12/17/15 16.7 5.91 -40 0.602 4.3 NM
03/09/16 14.7 8.04 40 0.637 9.7 NM
06/21/16 16.9 6.43 109 0.484 4.1 NM
09/29/16 19.4 6.38 -42 0.465 2.3 NM
12/20/16 15.7 6.65 -14 0.508 3.7 NM
03/21/17 17.6 8.68 73 0.247 12.3 NM
06/13/17 17.1 7.00 67.3 0.479 4.6 NM
09/20/17 18.7 6.57 44.2 0.550 2.43 >1000
12/05/17 18.1 6.51 -25.5 0.577 2.37 502
03/27/18 13.2 6.50 -7.1 0.553 2.04 9.89
06/07/18 17.3 6.18 -3.6 0.449 1.36 101
09/11/18 20.9 6.34 -29.1 0.690 0.99 184
12/18/18 15.6 6.51 -24.9 0.611 1.32 151
03/13/19 14.6 404.80 -6.2 0.4048 1.99 out of range
06/12/19 17.1 6.22 -22.4 0.5658 1.46 NM
09/11/19 22.1 5.81 -61.0 0.4892 1.09 NM
12/20/19 15.7 6.22 -50.4 0.4672 2.24 312
03/04/20 15.1 6.21 13.2 0.498 1.02 232
06/03/20 17.35 6.15 43.3 0.443 1.06 out of range
09/14/20 19.5 6.15 -11.1 0.4626 0.60 out of range
12/09/20 15.20 6.16 25.8 0.482 1.81 139
Notes:
1. DO - Dissolved oxygen
2. ORP - Oxygen reduction potential
3. mg/L - Milligrams per liter
4. mS/cm - milliSiemens per centimeter
5. mV - millivolts
6. NM - Not Measured
MW-11
MW-12
Page 1 of 3
TABLE 5
NATURAL ATTENUATION PARAMETER DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Temperature
(° Celcius)
pH
(std. Units)
ORP
(mV)
Cond.
(mS/cm)
DO
(mg/L)
Turbidity
(NTU)
06/30/11 19.5 5.24 220 0.079 0.7 NM
09/29/11 21.2 5.51 159 0.071 0.9 NM
12/20/11 17.4 5.37 171 0.075 0.8 NM
03/29/12 16.8 5.52 230 0.072 4.8 NM
06/28/12 20.3 5.10 151 0.064 1.6 NM
09/26/12 21.4 4.80 169 0.101 7.7 NM
12/03/12 17.0 5.90 198 0.081 4.8 NM
06/28/13 19.1 5.30 185 0.078 3.0 NM
12/30/13 18.6 5.40 185 0.075 2.0 NM
06/27/14 20.0 5.00 160 0.060 1.5 NM
12/30/14 18.7 5.40 182 0.073 2.8 NM
06/12/15 19.6 5.90 141 0.068 1.8 NM
09/17/15 19.3 5.13 70 0.040 9.6 NM
12/17/15 18.5 5.04 169 0.085 2.9 NM
03/09/16 16.7 4.67 2 0.093 4.8 NM
06/21/16 19.0 5.86 95 0.090 2.4 NM
09/29/16 22.9 5.10 110 0.066 1.6 NM
12/20/16 19.5 5.14 78 0.101 1.6 NM
03/21/17 17.4 5.26 58 0.107 4.3 NM
06/13/17 19.5 4.52 122 0.092 3.1 86
09/20/17 21.3 5.10 89.4 0.0868 1.69 62.8
12/05/17 20.3 5.48 57.9 0.1382 4.55 86
03/27/18 15.4 5.78 72.5 0.0870 4.78 103
06/07/18 17.9 5.37 105.4 96.9 1.78 117
09/11/18 24.5 5.15 159.1 0.0986 2.12 63.9
12/18/18 17.0 5.79 142.1 0.0831 4.60 101
03/13/19 17.3 5.70 115.1 86.1 2.14 45.8
06/12/19 18.6 6.53 85.4 72.4 5.16 NM
09/11/19 22.9 5.03 -23.6 129.2 1.31 NM
12/20/19 18.2 5.67 30.7 117.4 2.16 102
03/04/20 16.4 5.66 89.1 0.114 2.60 192
06/03/20 23.65 5.51 104.4 0.100 1.77 96.0
09/14/20 23.0 5.94 51.6 0.1716 1.03 105.6
12/09/20 17.64 5.78 39.0 0.189 1.73 355
06/30/11 19.9 6.29 202 0.037 3.6 62.8
09/29/11 21.0 6.20 190 0.069 4.2 NM
12/20/11 16.9 6.80 186 0.041 5.5 NM
03/29/12 15.2 5.83 207 0.039 5.5 NM
06/28/12 20.2 6.60 -32 0.087 5.2 NM
09/26/12 19.7 5.00 151 0.051 5.5 NM
12/03/12 16.2 5.90 175 0.042 5.4 NM
06/28/13 18.4 6.10 154 0.052 5.0 NM
12/30/13 18.3 6.40 133 0.052 4.9 NM
06/27/14 19.7 6.50 -25 0.091 4.2 NM
12/30/14 18.2 6.20 109 0.059 4.9 NM
06/12/15 19.7 6.60 -8 0.087 2.7 NM
12/17/15 NM NM NM NM 3.2 NM
03/09/15 NM NM NM NM 4.3 NM
06/21/16 NM NM NM NM 0.9 NM
12/20/16 NM NM NM NM 2.9 NM
03/21/17 15.8 6.30 120 0.033 6.51 NM
06/13/17 NM NM NM NM 3.11 NM
12/05/17 NM NM NM NM 2.52 NM
12/18/18 NM NM NM NM 2.63 NM
03/04/20 NM NM NM NM 2.04 NM
06/03/20 NM NM NM NM 3.22 NM
09/14/20 NM NM NM NM 1.31 NM
12/09/20 NM NM NM NM 2.90 NM
Notes:
1. DO - Dissolved oxygen
2. ORP - Oxygen reduction potential
3. mg/L - Milligrams per liter
4. mS/cm - milliSiemens per centimeter
5. mV - millivolts
6. NM - Not Measured
MW-13
DPE-11
Page 2 of 3
TABLE 5
NATURAL ATTENUATION PARAMETER DATA
FORMER CONOCOPHILLIPS TERMINAL NO. 33441 (RM 6578)
115 SOUTH CHIMNEY ROCK ROAD
GREENSBORO, NORTH CAROLINA
INCIDENT NO. 7706
Well I.D.Sample Date Temperature
(° Celcius)
pH
(std. Units)
ORP
(mV)
Cond.
(mS/cm)
DO
(mg/L)
Turbidity
(NTU)
06/30/11 20.7 6.87 103 0.310 0.2 NM
09/29/11 20.6 6.50 100 0.418 0.4 NM
12/20/11 17.2 6.40 97 0.487 0.3 NM
03/29/12 15.8 6.51 177 0.347 4.9 NM
06/28/12 21.6 6.70 10 0.324 1.5 NM
09/26/12 20.9 5.60 4 0.309 5.0 NM
12/03/12 16.3 6.60 3 0.332 4.9 NM
06/28/13 19.0 6.50 71 0.361 2.5 NM
12/30/13 19.0 6.64 53 0.363 1.7 NM
06/27/14 21.3 6.60 15 0.320 1.6 NM
12/30/14 18.9 6.60 36 0.344 2.7 NM
06/12/15 19.1 6.70 7 0.342 1.7 NM
12/17/15 NM NM NM NM 2.0 NM
03/09/16 NM NM NM NM 5.3 NM
06/21/16 NM NM NM NM 0.79 NM
12/20/16 NM NM NM NM 1.75 NM
03/21/17 15.7 7.40 93 0.137 10.82 NM
06/13/17 NM NM NM NM 1.58 NM
12/05/17 NM NM NM NM 1.22 NM
12/18/18 NM NM NM NM 5.63 NM
03/04/20 NM NM NM NM 0.10 NM
06/03/20 NM NM NM NM 1.25 NM
09/14/20 NM NM NM NM 0.48 NM
12/09/20 NM NM NM NM 0.21 NM
06/30/11 21.9 4.44 305 0.027 4.8 NM
09/29/11 20.1 4.60 291 0.053 5.2 NM
12/20/11 16.8 4.60 278 0.032 4.1 NM
03/29/12 17.4 5.13 253 0.029 3.8 NM
06/28/12 20.1 4.50 183 0.022 1.4 NM
09/26/12 21.8 4.50 217 0.036 5.6 NM
12/03/12 17.0 5.30 204 0.029 4.2 NM
06/28/13 19.3 4.70 247 0.033 4.2 NM
12/30/13 19.0 4.71 243 0.028 3.6 NM
06/27/14 20.0 4.80 176 0.018 1.6 NM
12/30/14 18.8 4.90 217 0.027 3.4 NM
06/12/15 20.0 5.40 151 0.010 1.4 NM
12/17/15 NM NM NM NM 4.3 NM
03/09/16 NM NM NM NM 2.6 NM
06/21/16 NM NM NM NM 1.26 NM
12/20/16 NM NM NM NM 4.03 NM
03/21/17 19.6 4.42 199 0.021 4.31 NM
06/13/17 NM NM NM NM 0.72 NM
12/05/17 NM NM NM NM 1.13 NM
12/18/18 NM NM NM NM 1.52 NM
03/04/20 NM NM NM NM 0.56 NM
06/03/20 NM NM NM NM 1.31 NM
09/14/20 NM NM NM NM 0.48 NM
12/09/20 NM NM NM NM 2.08 NM
06/30/11 21.5 8.09 -15 0.286 0.4 NM
09/29/11 21.1 7.80 -16 0.525 0.5 NM
12/20/11 17.1 7.90 -15 0.396 0.4 NM
03/29/12 15.3 6.11 203 0.413 3.7 NM
06/28/12 22.8 6.53 65 0.332 1.6 NM
09/26/12 20.7 4.80 193 0.248 6.7 NM
12/03/12 15.9 6.20 198 0.246 4.0 NM
06/28/13 19.2 6.80 88 0.349 2.5 NM
12/30/13 19.3 7.18 58 0.315 1.6 NM
06/27/14 22.5 6.60 72 0.347 1.7 NM
12/30/14 19.2 6.70 104 3.000 2.4 NM
06/12/15 20.1 6.70 84 0.361 1.4 NM
12/17/15 NM NM NM NM 8.3 NM
03/09/16 NM NM NM NM 5.0 NM
06/21/16 NM NM NM NM 3.1 NM
12/20/16 NM NM NM NM 0.8 NM
03/21/17 15.2 5.20 164 0.273 3.76 NM
06/13/17 NM NM NM NM 1.34 NM
12/05/17 NM NM NM NM 3.98 NM
12/18/18 NM NM NM NM 1.13 NM
03/04/20 NM NM NM NM 0.09 NM
06/03/20 NM NM NM NM 1.53 NM
09/14/20 NM NM NM NM 0.29 NM
12/09/20 NM NM NM NM 0.83 NM
Notes:
1. DO - Dissolved oxygen
2. ORP - Oxygen reduction potential
3. mg/L - Milligrams per liter
4. mS/cm - milliSiemens per centimeter
5. mV - millivolts
6. NM - Not Measured
DPE-22
DPE-14
DPE-20
Page 3 of 3

FIGURES

2725 E. Millbrook Road, Ste 121
Raleigh, NC 27604
[phone]
PROJECT NO: P666578701
DATE: 7/2019 REVIEWED BY: GA
Former ConocoPhillips Terminal No. 33441
(RM #6578)
115 S. Chimney Rock Road
Greensboro, Guilford County, North Carolina
SOURCE: MyTopoMap.com
SCALE: 1” = 1,500’
FIGURE 1: SITE TOPOGRAPHIC MAP
SITE
N
STORMWATERPONDGASSAGASWOPEN DITCHUGETANKBURNT POPLAR ROADPOLEUTILITYT7TANK 6TANK 1TANK 2TANK 5SACULVERTPIPESCATCHBASINTANK 8CHIMNEY ROCK ROADWWTOP OFOFFICEPUMPSTANK TRUCKOILFUELRACKLOADINGTANK 4TANK 3SHEDWAREHOUSETANK 9DIKEAIRSPARGETANKWATERTSATANKSLOPRECEIVERSEPARATORTANKOILSYSTEMAIR SPARGEMANIFOLDAPPROXIMATE LOCATIONOF LONG BRANCHUGETSAWGASCAD FILE PREP. BYTYPE CODE REV. BY SCALE PROJECT NO.
TITLE
DATE
NOTES:
GEOTECHNICALENVIRONMENTAL
MATERIALS TESTINGBUILDING SCIENCES2725 E. Millbrook Road, Suite 121
[phone] FAX [phone]
Raleigh, North Carolina 27604
2725 E. Millbrook Road, Ste 121
Raleigh, NC 27604
[phone]
PROJECT NO: P666578701
DATE: 7/2019 REVIEWED BY: GA
Former ConocoPhillips Terminal No. 33441
(RM #6578)
115 S. Chimney Rock Road
Greensboro, Guilford County, North CarolinaSCALE: 1” = 500’
FIGURE 3: POTENTIAL RECEPTOR MAP
Source: Guilford County NC GIS
SITE
N
Note: No water supply wells were identified within 1,000 feet of the site.
On-Site
Retention Pond
Approximate
Location of Long
Branch
STORMWATERPONDGASSAGASWOPEN DITCHUGETANKBURNT POPLAR ROADPOLEUTILITYT7TANK 6TANK 1TANK 2TANK 5SACULVERTPIPESCATCHBASINTANK 8CHIMNEY ROCK ROADWWTOP OFOFFICEPUMPSTANK TRUCKOILFUELRACKLOADINGTANK 4TANK 3SHEDWAREHOUSETANK 9DIKEAIRSPARGETANKWATERTSATANKSLOPRECEIVERSEPARATORTANKOILSYSTEMAIR SPARGEMANIFOLDAPPROXIMATE LOCATIONOF LONG BRANCHUGETSAWGASCAD FILE PREP. BYTYPE CODE REV. BY SCALE PROJECT NO.
TITLE
DATE
NOTES:
GEOTECHNICALENVIRONMENTAL
MATERIALS TESTINGBUILDING SCIENCES
2725 E. Millbrook Road, Suite 121
[phone] FAX [phone]
Raleigh, North Carolina 27604
STORMWATERPONDGASSAGASWOPEN DITCHUGETANKBURNT POPLAR ROADPOLEUTILITYT7TANK 6TANK 1TANK 2TANK 5SACULVERTPIPESCATCHBASINTANK 8CHIMNEY ROCK ROADWWTOP OFOFFICEPUMPSTANK TRUCKOILFUELRACKLOADINGTANK 4TANK 3SHEDWAREHOUSETANK 9DIKEAIRSPARGETANKWATERTSATANKSLOPRECEIVERSEPARATORTANKOILSYSTEMAIR SPARGEMANIFOLDAPPROXIMATE LOCATIONOF LONG BRANCHUGETSAWGASCAD FILE PREP. BYTYPE CODE REV. BY SCALE PROJECT NO.
TITLE
DATE
NOTES:
GEOTECHNICALENVIRONMENTAL
MATERIALS TESTINGBUILDING SCIENCES
2725 E. Millbrook Road, Suite 121
[phone] FAX [phone]
Raleigh, North Carolina 27604
STORMWATERPONDGASSAGASWOPEN DITCHUGETANKBURNT POPLAR ROADPOLEUTILITYT7TANK 6TANK 1TANK 2TANK 5SACULVERTPIPESCATCHBASINTANK 8CHIMNEY ROCK ROADWWTOP OFOFFICEPUMPSTANK TRUCKOILFUELRACKLOADINGTANK 4TANK 3SHEDWAREHOUSETANK 9DIKEAIRSPARGETANKWATERTSATANKSLOPRECEIVERSEPARATORTANKOILSYSTEMAIR SPARGEMANIFOLDAPPROXIMATE LOCATIONOF LONG BRANCHUGETSAWGASCAD FILE PREP. BYTYPE CODE REV. BY SCALE PROJECT NO.
TITLE
DATE
NOTES:
GEOTECHNICALENVIRONMENTAL
MATERIALS TESTINGBUILDING SCIENCES
2725 E. Millbrook Road, Suite 121
[phone] FAX [phone]
Raleigh, North Carolina 27604

APPENDIX A
LABORATORY ANALYTICAL RESULTS

09/17/20
Technical Report for
ATC Group Services LLC
RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
P666578845
SGS Job Number: LA66468
Sampling Date: 09/14/20
Report to:
ATC Group Services LLC.
2725 East Millbrook Road Suite 121
Raleigh, NC 27604
[e-mail]; [e-mail]
ATTN: Gabe Araos
Total number of pages in report:
Certifications: LDEQ(2048), LDHH(LA150012), AR(14-045-04), AZ(AZ0805), FL(E87657), IL(200082), KY(#31),
NC(487), SC(73004001), NJ(LA007), TX(T104704186-18-16), WV(257)
This report shall not be reproduced, except in its entirety, without the written approval of SGS.
Test results relate only to samples analyzed.
SGS North America Inc. • 500 Ambassador Caffery • Scott, LA 70583 • tel: [phone]
Test results contained within this data package meet the requirements
of the National Environmental Laboratory Accreditation Program
and/or state specific certification programs as applicable.
Client Service contact: Amy Jackson 337-237-4775
Ron Benjamin
Lab Director
Scott, LA 09/17/20
e-Hardcopy 2.0
Automated Report
16
SGS is the sole authority for authorizing edits or modifications to this document.
Unauthorized modification of this report is strictly prohibited.
Review standard terms at: http://www.sgs.com/en/terms-and-conditions
The results set forth herein are provided by SGS North America Inc.
Please share your ideas about
how we can serve you better at:
[e-mail]
1 of 16
LA66468
Table of Contents
-1-
Sections:
Section 1: Sample Summary ...................................................................................................3
Section 2: Summary of Hits ....................................................................................................4
Section 3: Sample Results ........................................................................................................5
3.1: LA66468-1: MW11 ......................................................................................................6
3.2: LA66468-2: MW12 ......................................................................................................7
3.3: LA66468-3: MW13 ......................................................................................................8
Section 4: Misc. Forms ............................................................................................................9
4.1: Chain of Custody ...........................................................................................................10
Section 5: MS Volatiles - QC Data Summaries .....................................................................13
5.1: Method Blank Summary ................................................................................................14
5.2: Blank Spike/Blank Spike Duplicate Summary ..............................................................15
5.3: Matrix Spike/Matrix Spike Duplicate Summary ...........................................................16 123452 of 16
LA66468
SGS North America Inc.
Sample Summary
ATC Group Services LLC
Job No:LA66468
RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Project No: P666578845
Sample Collected Matrix Client
Number Date Time By Received Code Type Sample ID
This report contains results reported as ND = Not detected. The following applies:
Organics ND = Not detected above the RL
LA66468-1 09/14/20 13:35 09/16/20 AQ Ground Water MW11
LA66468-2 09/14/20 13:00 09/16/20 AQ Ground Water MW12
LA66468-3 09/14/20 12:15 09/16/20 AQ Ground Water MW13
3 of 16
LA664681
Summary of Hits Page 1 of 1
Job Number:LA66468
Account:ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Collected:09/14/20
Lab Sample ID Client Sample ID Result/
Analyte Qual RL MDL Units Method
LA66468-1 MW11
Methyl Tert Butyl Ether 34.8 1.0 ug/l SW846 8260B
LA66468-2 MW12
Benzene 24.5 1.0 ug/l SW846 8260B
Methyl Tert Butyl Ether 56.0 1.0 ug/l SW846 8260B
LA66468-3 MW13
No hits reported in this sample.
4 of 16
LA664682
SGS North America Inc.
Sample Results
Report of Analysis
Scott, LA
Section 3
5 of 16
LA664683
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW11
Lab Sample ID:LA66468-1 Date Sampled:09/14/20
Matrix:AQ - Ground Water Date Received:09/16/20
Method:SW846 8260B Percent Solids:n/a
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1Q0462121.D 1 09/16/20 21:08 CP n/a n/a V1Q2911
Run #2
Purge Volume
Run #1 5.0 ml
Run #2
Purgeable Aromatics, MTBE
CAS No.Compound Result RL Units Q
71-43-2 Benzene ND 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
1634-04-4 Methyl Tert Butyl Ether 34.8 1.0 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 106%81-120%
2037-26-5 Toluene-D8 97%93-105%
460-00-4 4-Bromofluorobenzene 93%89-107%
ND = Not detected J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
6 of 16
LA6646833.1
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW12
Lab Sample ID:LA66468-2 Date Sampled:09/14/20
Matrix:AQ - Ground Water Date Received:09/16/20
Method:SW846 8260B Percent Solids:n/a
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1Q0462122.D 1 09/16/20 21:31 CP n/a n/a V1Q2911
Run #2
Purge Volume
Run #1 5.0 ml
Run #2
Purgeable Aromatics, MTBE
CAS No.Compound Result RL Units Q
71-43-2 Benzene 24.5 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
1634-04-4 Methyl Tert Butyl Ether 56.0 1.0 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 99%81-120%
2037-26-5 Toluene-D8 103%93-105%
460-00-4 4-Bromofluorobenzene 97%89-107%
ND = Not detected J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
7 of 16
LA6646833.2
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW13
Lab Sample ID:LA66468-3 Date Sampled:09/14/20
Matrix:AQ - Ground Water Date Received:09/16/20
Method:SW846 8260B Percent Solids:n/a
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1Q0462123.D 1 09/16/20 21:54 CP n/a n/a V1Q2911
Run #2
Purge Volume
Run #1 5.0 ml
Run #2
Purgeable Aromatics, MTBE
CAS No.Compound Result RL Units Q
71-43-2 Benzene ND 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 1.0 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 107%81-120%
2037-26-5 Toluene-D8 97%93-105%
460-00-4 4-Bromofluorobenzene 96%89-107%
ND = Not detected J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
8 of 16
LA6646833.3
SGS North America Inc.
Misc. Forms
Custody Documents and Other Forms
Includes the following where applicable:
• Chain of Custody
Scott, LA
Section 4
9 of 16
LA664684
LA66468: Chain of Custody
Page 1 of 3
10 of 16
LA6646844.1
LA66468: Chain of Custody
Page 2 of 3
11 of 16
LA6646844.1
SGS Sample Receipt Summary
Job Number:LA66468 Client:ATC
Date / Time Received:9/16/2020 8:40:00 AM Delivery Method:FedEx
Project:RM 6578
4. No. Coolers:1
Airbill #'s:4913 8691 8267
Cooler Security
1. Custody Seals Present:
Y or N
2. Custody Seals Intact:
3. COC Present:
4. Smpl Dates/Time OK
2. Thermometer ID:
Cooler Temperature Y or N
1. Temp criteria achieved:
3. Cooler media:
DV462;
Ice (direct contact)
Quality Control Preservation Y or N N/A
1. Trip Blank present / cooler:
2. Trip Blank listed on COC:
3. Samples preserved properly:
4. VOCs headspace free:
Sample Integrity - Documentation Y or N
1. Sample labels present on bottles:
2. Container labeling complete:
3. Sample container label / COC agree:
Sample Integrity - Condition Y or N
1. Sample recvd within HT:
3. Condition of sample:
2. All containers accounted for:
Sample Integrity - Instructions
1. Analysis requested is clear:
2. Bottles received for unspecified tests
3. Sufficient volume recvd for analysis:
4. Compositing instructions clear:
5. Filtering instructions clear:
Intact
Y or N
Comments
Y or N N/A
Cooler Temps (Initial/Adjusted):#1: (1.8/1.8);
LA66468: Chain of Custody
Page 3 of 3
12 of 16
LA6646844.1
SGS North America Inc.
MS Volatiles
QC Data Summaries
Includes the following where applicable:
• Method Blank Summaries
• Blank Spike Summaries
• Matrix Spike and Duplicate Summaries
Scott, LA
Section 5
13 of 16
LA664685
Method Blank Summary Page 1 of 1
Job Number:LA66468
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q2911-MB2 1Q0462104.D 1 09/16/20 CP n/a n/a V1Q2911
The QC reported here applies to the following samples:Method: SW846 8260B
LA66468-1, LA66468-2, LA66468-3
CAS No.Compound Result RL Units Q
71-43-2 Benzene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
CAS No.Surrogate Recoveries Limits
17060-07-0 1,2-Dichloroethane-D4 105%81-120%
2037-26-5 Toluene-D8 98%93-105%
460-00-4 4-Bromofluorobenzene 94%89-107%
14 of 16
LA6646855.1.1
Blank Spike/Blank Spike Duplicate Summary Page 1 of 1
Job Number:LA66468
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1Q2911-BS2 1Q0462100.D 1 09/16/20 CP n/a n/a V1Q2911
V1Q2911-BSD2 1Q0462102.D 1 09/16/20 CP n/a n/a V1Q2911
The QC reported here applies to the following samples:Method: SW846 8260B
LA66468-1, LA66468-2, LA66468-3
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
71-43-2 Benzene 20 18.7 94 18.6 93 1 82-119/11
100-41-4 Ethylbenzene 20 18.6 93 18.2 91 2 82-120/11
1634-04-4 Methyl Tert Butyl Ether 20 16.5 83 17.0 85 3 73-124/14
108-88-3 Toluene 20 18.7 94 18.2 91 3 82-118/12
1330-20-7 Xylene (total)60 55.4 92 53.8 90 3 82-122/11
CAS No.Surrogate Recoveries BSP BSD Limits
17060-07-0 1,2-Dichloroethane-D4 102%103%81-120%
2037-26-5 Toluene-D8 97%98%93-105%
460-00-4 4-Bromofluorobenzene 98%98%89-107%
* = Outside of Control Limits.
15 of 16
LA6646855.2.1
Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 1
Job Number:LA66468
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA66447-9MS 1Q0462119.D 2 09/16/20 CP n/a n/a V1Q2911
LA66447-9MSD 1Q0462120.D 2 09/16/20 CP n/a n/a V1Q2911
LA66447-9 1Q0462113.D 1 09/16/20 CP n/a n/a V1Q2911
The QC reported here applies to the following samples:Method: SW846 8260B
LA66468-1, LA66468-2, LA66468-3
LA66447-9 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
71-43-2 Benzene 10 40 46.9 92 40 39.8 75 16*41-155/14
100-41-4 Ethylbenzene 3.1 40 41.2 95 40 34.1 78 19*50-147/15
1634-04-4 Methyl Tert Butyl Ether 2.2 40 39.5 93 40 32.4 76 20*48-143/15
108-88-3 Toluene 6.6 40 41.5 87 40 34.3 69 19*40-153/15
1330-20-7 Xylene (total)49.7 120 155 88 120 135 71 14 46-154/15
CAS No.Surrogate Recoveries MS MSD LA66447-9 Limits
17060-07-0 1,2-Dichloroethane-D4 105%104%98%81-120%
2037-26-5 Toluene-D8 97%98%97%93-105%
460-00-4 4-Bromofluorobenzene 97%98%97%89-107%
* = Outside of Control Limits.
16 of 16
LA6646855.3.1
02/19/21
Technical Report for
ATC Group Services LLC
RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
P666578845
SGS Job Number: LA68328
Sampling Date: 12/09/20
Report to:
ATC Group Services LLC.
2725 East Millbrook Road Suite 121
Raleigh, NC 27604
[e-mail]; [e-mail]
ATTN: Gabe Araos
Total number of pages in report:
Certifications: LDEQ(2048), LDHH(LA150012), AR(14-045-04), AZ(AZ0805), FL(E87657), IL(200082), KY(#31),
NC(487), SC(73004001), NJ(LA007), TX(T104704186-18-16), WV(257)
This report shall not be reproduced, except in its entirety, without the written approval of SGS.
Test results relate only to samples analyzed.
SGS North America Inc. • 500 Ambassador Caffery • Scott, LA 70583 • tel: [phone]
Test results contained within this data package meet the requirements
of the National Environmental Laboratory Accreditation Program
and/or state specific certification programs as applicable.
Client Service contact: Amy Jackson 337-237-4775
Ron Benjamin
Lab Director
Scott, LA 02/19/21
e-Hardcopy 2.0
Automated Report
19
SGS is the sole authority for authorizing edits or modifications to this document.
Unauthorized modification of this report is strictly prohibited.
Review standard terms at: http://www.sgs.com/en/terms-and-conditions
The results set forth herein are provided by SGS North America Inc.
Please share your ideas about
how we can serve you better at:
[e-mail]
1 of 19
LA68328
Table of Contents
-1-
Sections:
Section 1: Sample Summary ...................................................................................................3
Section 2: Summary of Hits ....................................................................................................4
Section 3: Sample Results ........................................................................................................5
3.1: LA68328-1: MW11 ......................................................................................................6
3.2: LA68328-2: MW12 ......................................................................................................7
3.3: LA68328-3: MW13 ......................................................................................................8
Section 4: Misc. Forms ............................................................................................................9
4.1: Chain of Custody ...........................................................................................................10
Section 5: MS Volatiles - QC Data Summaries .....................................................................13
5.1: Method Blank Summary ................................................................................................14
5.2: Blank Spike/Blank Spike Duplicate Summary ..............................................................16
5.3: Matrix Spike/Matrix Spike Duplicate Summary ...........................................................18 123452 of 19
LA68328
SGS North America Inc.
Sample Summary
ATC Group Services LLC
Job No:LA68328
RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Project No: P666578845
Sample Collected Matrix Client
Number Date Time By Received Code Type Sample ID
This report contains results reported as ND = Not detected. The following applies:
Organics ND = Not detected above the RL
LA68328-1 12/09/20 13:45 TJ 12/11/20 AQ Ground Water MW11
LA68328-2 12/09/20 14:35 TJ 12/11/20 AQ Ground Water MW12
LA68328-3 12/09/20 15:10 TJ 12/11/20 AQ Ground Water MW13
3 of 19
LA683281
Summary of Hits Page 1 of 1
Job Number:LA68328
Account:ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Collected:12/09/20
Lab Sample ID Client Sample ID Result/
Analyte Qual RL MDL Units Method
LA68328-1 MW11
Methyl Tert Butyl Ether 21.7 1.0 ug/l SW846 8260B
LA68328-2 MW12
Benzene 15.1 1.0 ug/l SW846 8260B
Ethylbenzene 1.8 1.0 ug/l SW846 8260B
Methyl Tert Butyl Ether 63.9 1.0 ug/l SW846 8260B
LA68328-3 MW13
No hits reported in this sample.
4 of 19
LA683282
SGS North America Inc.
Sample Results
Report of Analysis
Scott, LA
Section 3
5 of 19
LA683283
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW11
Lab Sample ID:LA68328-1 Date Sampled:12/09/20
Matrix:AQ - Ground Water Date Received:12/11/20
Method:SW846 8260B Percent Solids:n/a
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 1X0112964.D 1 12/15/20 12:37 CP n/a n/a V1X5090
Run #2
Purge Volume
Run #1 5.0 ml
Run #2
Purgeable Aromatics, MTBE
CAS No.Compound Result RL Units Q
71-43-2 Benzene ND 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
1634-04-4 Methyl Tert Butyl Ether 21.7 1.0 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 96%81-120%
2037-26-5 Toluene-D8 98%93-105%
460-00-4 4-Bromofluorobenzene 100%89-107%
ND = Not detected J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
6 of 19
LA6832833.1
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW12
Lab Sample ID:LA68328-2 Date Sampled:12/09/20
Matrix:AQ - Ground Water Date Received:12/11/20
Method:SW846 8260B Percent Solids:n/a
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 2X0112979.D 1 12/15/20 16:01 CP n/a n/a V2X5090
Run #2
Purge Volume
Run #1 5.0 ml
Run #2
Purgeable Aromatics, MTBE
CAS No.Compound Result RL Units Q
71-43-2 Benzene 15.1 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
100-41-4 Ethylbenzene 1.8 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
1634-04-4 Methyl Tert Butyl Ether 63.9 1.0 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 111%81-120%
2037-26-5 Toluene-D8 99%93-105%
460-00-4 4-Bromofluorobenzene 104%89-107%
ND = Not detected J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
7 of 19
LA6832833.2
SGS North America Inc.
Report of Analysis Page 1 of 1
Client Sample ID:MW13
Lab Sample ID:LA68328-3 Date Sampled:12/09/20
Matrix:AQ - Ground Water Date Received:12/11/20
Method:SW846 8260B Percent Solids:n/a
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
Run #1 2X0112981.D 1 12/15/20 16:27 CP n/a n/a V2X5090
Run #2
Purge Volume
Run #1 5.0 ml
Run #2
Purgeable Aromatics, MTBE
CAS No.Compound Result RL Units Q
71-43-2 Benzene ND 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 1.0 ug/l
CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits
17060-07-0 1,2-Dichloroethane-D4 104%81-120%
2037-26-5 Toluene-D8 101%93-105%
460-00-4 4-Bromofluorobenzene 102%89-107%
ND = Not detected J = Indicates an estimated value
RL = Reporting Limit B = Indicates analyte found in associated method blank
E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound
8 of 19
LA6832833.3
SGS North America Inc.
Misc. Forms
Custody Documents and Other Forms
Includes the following where applicable:
• Chain of Custody
Scott, LA
Section 4
9 of 19
LA683284
LA68328: Chain of Custody
Page 1 of 3
10 of 19
LA6832844.1
LA68328: Chain of Custody
Page 2 of 3
11 of 19
LA6832844.1
SGS Sample Receipt Summary
Job Number:LA68328 Client:ATC
Date / Time Received:12/11/2020 9:20:00 AM Delivery Method:FedEx
Project:RM6578
4. No. Coolers:1
Airbill #'s:4913 8692 2112
Cooler Security
1. Custody Seals Present:
Y or N
2. Custody Seals Intact:
3. COC Present:
4. Smpl Dates/Time OK
2. Thermometer ID:
Cooler Temperature Y or N
1. Temp criteria achieved:
3. Cooler media:
;
Ice (direct contact)
Quality Control Preservation Y or N N/A
1. Trip Blank present / cooler:
2. Trip Blank listed on COC:
3. Samples preserved properly:
4. VOCs headspace free:
Sample Integrity - Documentation Y or N
1. Sample labels present on bottles:
2. Container labeling complete:
3. Sample container label / COC agree:
Sample Integrity - Condition Y or N
1. Sample recvd within HT:
3. Condition of sample:
2. All containers accounted for:
Sample Integrity - Instructions
1. Analysis requested is clear:
2. Bottles received for unspecified tests
3. Sufficient volume recvd for analysis:
4. Compositing instructions clear:
5. Filtering instructions clear:
Intact
Y or N
Comments
Y or N N/A
Cooler Temps (Initial/Adjusted):0
LA68328: Chain of Custody
Page 3 of 3
12 of 19
LA6832844.1
SGS North America Inc.
MS Volatiles
QC Data Summaries
Includes the following where applicable:
• Method Blank Summaries
• Blank Spike Summaries
• Matrix Spike and Duplicate Summaries
Scott, LA
Section 5
13 of 19
LA683285
Method Blank Summary Page 1 of 1
Job Number:LA68328
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2X5090-MB2 2X0112963.D 1 12/15/20 CP n/a n/a V2X5090
The QC reported here applies to the following samples:Method: SW846 8260D
LA68328-2, LA68328-3
CAS No.Compound Result RL Units Q
71-43-2 Benzene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
CAS No.Surrogate Recoveries Limits
17060-07-0 1,2-Dichloroethane-D4 100%81-120%
2037-26-5 Toluene-D8 101%93-105%
460-00-4 4-Bromofluorobenzene 103%89-107%
14 of 19
LA6832855.1.1
Method Blank Summary Page 1 of 1
Job Number:LA68328
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1X5090-MB2 1X0112962.D 1 12/15/20 CP n/a n/a V1X5090
The QC reported here applies to the following samples:Method: SW846 8260B
LA68328-1
CAS No.Compound Result RL Units Q
71-43-2 Benzene ND 1.0 ug/l
100-41-4 Ethylbenzene ND 1.0 ug/l
1634-04-4 Methyl Tert Butyl Ether ND 1.0 ug/l
108-88-3 Toluene ND 1.0 ug/l
1330-20-7 Xylene (total)ND 2.0 ug/l
CAS No.Surrogate Recoveries Limits
17060-07-0 1,2-Dichloroethane-D4 98%81-120%
2037-26-5 Toluene-D8 97%93-105%
460-00-4 4-Bromofluorobenzene 100%89-107%
15 of 19
LA6832855.1.2
Blank Spike/Blank Spike Duplicate Summary Page 1 of 1
Job Number:LA68328
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V2X5090-BS1 2X0112957.D 1 12/15/20 CP n/a n/a V2X5090
V2X5090-BSD1 2X0112959.D 1 12/15/20 CP n/a n/a V2X5090
The QC reported here applies to the following samples:Method: SW846 8260D
LA68328-2, LA68328-3
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
71-43-2 Benzene 20 19.0 95 20.0 100 5 82-119/14
100-41-4 Ethylbenzene 20 19.8 99 21.1 106 6 82-120/15
1634-04-4 Methyl Tert Butyl Ether 20 20.3 102 20.1 101 1 73-124/15
108-88-3 Toluene 20 18.6 93 19.8 99 6 82-118/15
1330-20-7 Xylene (total)60 61.1 102 64.2 107 5 82-122/15
CAS No.Surrogate Recoveries BSP BSD Limits
17060-07-0 1,2-Dichloroethane-D4 106%104%81-120%
2037-26-5 Toluene-D8 100%102%93-105%
460-00-4 4-Bromofluorobenzene 103%105%89-107%
* = Outside of Control Limits.
16 of 19
LA6832855.2.1
Blank Spike/Blank Spike Duplicate Summary Page 1 of 1
Job Number:LA68328
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
V1X5090-BS1 1X0112956.D 1 12/15/20 CP n/a n/a V1X5090
V1X5090-BSD1 1X0112958.D 1 12/15/20 CP n/a n/a V1X5090
The QC reported here applies to the following samples:Method: SW846 8260B
LA68328-1
Spike BSP BSP BSD BSD Limits
CAS No.Compound ug/l ug/l %ug/l %RPD Rec/RPD
71-43-2 Benzene 20 17.8 89 18.3 92 3 82-119/11
100-41-4 Ethylbenzene 20 18.3 92 18.9 95 3 82-120/11
1634-04-4 Methyl Tert Butyl Ether 20 18.7 94 18.9 95 1 73-124/14
108-88-3 Toluene 20 17.3 87 18.0 90 4 82-118/12
1330-20-7 Xylene (total)60 56.3 94 58.8 98 4 82-122/11
CAS No.Surrogate Recoveries BSP BSD Limits
17060-07-0 1,2-Dichloroethane-D4 107%105%81-120%
2037-26-5 Toluene-D8 100%100%93-105%
460-00-4 4-Bromofluorobenzene 103%104%89-107%
* = Outside of Control Limits.
17 of 19
LA6832855.2.2
Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 1
Job Number:LA68328
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA68216-3MS 2X0112987.D 50 12/15/20 CP n/a n/a V2X5090
LA68216-3MSD 2X0112989.D 50 12/15/20 CP n/a n/a V2X5090
LA68216-3 2X0112985.D 20 12/15/20 CP n/a n/a V2X5090
The QC reported here applies to the following samples:Method: SW846 8260B
LA68328-2, LA68328-3
LA68216-3 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
71-43-2 Benzene 79.8 1000 1120 104 1000 1010 93 10 41-155/14
100-41-4 Ethylbenzene 135 1000 1200 107 1000 1110 98 8 50-147/15
1634-04-4 Methyl Tert Butyl Ether ND 1000 1080 108 1000 1030 103 5 48-143/15
108-88-3 Toluene 115 1000 1120 101 1000 1030 92 8 40-153/15
1330-20-7 Xylene (total)5620 3000 9020 113 3000 8410 93 7 46-154/15
CAS No.Surrogate Recoveries MS MSD LA68216-3 Limits
17060-07-0 1,2-Dichloroethane-D4 106%107%104%81-120%
2037-26-5 Toluene-D8 102%101%98%93-105%
460-00-4 4-Bromofluorobenzene 103%103%105%89-107%
* = Outside of Control Limits.
18 of 19
LA6832855.3.1
Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 1
Job Number:LA68328
Account:ATCNCR ATC Group Services LLC
Project:RM#6578(ATCPSIX), 115 South Chimney Rock Rd, Greensboro, NC
Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch
LA68322-13MS 1X0113004.D 10 12/15/20 CP n/a n/a V1X5090
LA68322-13MSD 1X0113006.D 10 12/15/20 CP n/a n/a V1X5090
LA68322-13 a 1X0113002.D 1 12/15/20 CP n/a n/a V1X5090
LA68322-13 1X0112986.D 10 12/15/20 CP n/a n/a V1X5090
The QC reported here applies to the following samples:Method: SW846 8260B
LA68328-1
LA68322-13 Spike MS MS Spike MSD MSD Limits
CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD
71-43-2 Benzene 963 E 200 4210 1624* b 200 4130 1584* b 2 41-155/14
100-41-4 Ethylbenzene 44.6 c 200 229 90 200 220 85 4 50-147/15
1634-04-4 Methyl Tert Butyl Ether ND c 200 198 99 200 190 95 4 48-143/15
108-88-3 Toluene ND c 200 181 90 200 180 90 1 40-153/15
1330-20-7 Xylene (total)23.1 c 600 596 95 600 576 92 3 46-154/15
CAS No.Surrogate Recoveries MS MSD LA68322-13 LA68322-13 Limits
17060-07-0 1,2-Dichloroethane-D4 116%112%224%* d 116%81-120%
2037-26-5 Toluene-D8 98%100%97%96%93-105%
460-00-4 4-Bromofluorobenzene 104%102%102%104%89-107%
(a) Sample used for QC purposes only.
(b) Outside control limits due to high level in sample relative to spike amount.
(c) Result is from Run #2.
(d) Outside control limits due to matrix interference. Confirmed by reanalysis at a dilution.
* = Outside of Control Limits.
19 of 19
LA6832855.3.2

APPENDIX B
CONCENTRATION VERSUS TIME AND GROUNDWATER ELEVATION
VERSUS TIME GRAPHS

890.00
895.00
900.00
905.00
910.00
915.00
920.00
0
200
400
600
800
1000
1200
1400
1600
Concentration (µg/L)Date
MW-11
Concentration vs. Time Graph / Groundwater Elevation vs. Time Graph
MTBE Groundwater Elevation
GroundwaterElevation (feet)
890.00
895.00
900.00
905.00
910.00
915.00
920.00
0.00
100.00
200.00
300.00
400.00
500.00
600.00
Concentration (µg/L)Date
MW-12
Concentration vs. Time Graph / Groundwater Elevation vs. Time Graph
Benzene MTBE Groundwater Elevation
GroundwaterElevation (feet)
890.00
895.00
900.00
905.00
910.00
915.00
920.00
0.00
200.00
400.00
600.00
800.00
1000.00
Concentration (µg/L)Date
MW-13
Concentration vs. Time Graph / Groundwater Elevation vs. Time Graph
Benzene MTBE Groundwater Elevation
GroundwaterElevation (feet)