Central Ave Apts_BF Additional Assmt Rpt

Via Email
December 11, 2015

NC Department of Environmental
Quality – Brownfields Program
1646 Mail Service Center
Raleigh, NC 27699-1646
Attention: Mr. Jim Rudder

Re: Brownfields Additional Assessment Report
Central Avenue Apartments Charlotte, North Carolina
Brownfields ID 19032-15-60
H&H Job No. DPJ-001

Dear Jim:

1.0 Introduction and Background

In accordance with our authorized scope of work, Hart & Hickman, PC (H&H) has completed
additional assessment activities for the Central Avenue Apartments project located at 1931-2027
Central Avenue (Site) in Charlotte, Mecklenburg County, North Carolina (Figure 1). This site is
currently in the North Carolina Brownfields Redevelopment Now Program (Brownfields Project
#19032-15-60). The proposed future use is multi-family residential. The Site is comprised of six
parcels totaling approximately 1.96 acres and is currently developed with a commercial/residential
building that contains 4,576 square feet and an automotive service building that is 7,400 square
feet.

H&H completed a Phase I Environmental Site Assessment (ESA) for the six parcels in March
2015. Based on the findings of the Phase I ESA, H&H identified several Recognized
Environmental Conditions (RECs) associated with the site.

Mr. Jim Rudder
December 11, 2015
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On June 4 and 5 and June 8 and 9, 2015, H&H completed initial Brownfields assessment activities
at the site. The assessment activities included the advancement and sampling of soil borings and
temporary monitoring wells to assess for the potential of a release related to the historical use of
2027 Central Avenue, to further define the petroleum hydrocarbon groundwater impacts associated
with 2013 Central Avenue, and to assess potential for site impacts from the adjacent off-site 7-
Eleven Store property. Additionally, soil gas (SG) sampling was completed to evaluate potential
risk for vapor intrusion from petroleum hydrocarbons in groundwater beneath the site.

The results of the soil sampling indicated a concentration of TPH-DRO above the North Carolina
Department of Environmental Quality (DEQ) Action Level of 10 mg/kg in one soil sample. No
volatile organic compounds (VOCs) or semi-VOCs (SVOCs) were detected above the laboratory
reporting limits in this sample or the other soil samples. The results of the groundwater samples
collected from two temporary monitoring wells indicated various VOC concentrations above their
respective 15A NCAC 2L Groundwater Quality Standards (2L Standards) and the DEQ
Residential Vapor Intrusion Groundwater Screening Levels (GWSLs). Additionally, laboratory
analytical results for the soil gas samples indicated that VOCs were detected above DEQ
Residential Soil Gas Screening Levels (SGSLs).

The results of the Brownfields assessment activities were presented in H&H’s Brownfields
Assessment Report dated July 23, 2015. Following review of the report, DEQ requested that
additional soil gas and groundwater sampling be conducted downgradient of the site. A
Brownfields Additional Assessment Work Plan was sent to DEQ on September 16, 2015. The
work plan was approved by DEQ via email on September 28, 2015. Additional assessment
sampling methodology, results, and conclusions are presented in the following sections.

Mr. Jim Rudder
December 11, 2015
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2.0 Assessment Activities

2.1 Groundwater Assessment Activities

On June 4 and 5, 2015, temporary monitoring well TMW-6 was installed on the adjacent 2020
Hamorton Place property and temporary monitoring well TMW-7 was installed on the adjacent
2028 Hamorton Place property (Figure 2). The temporary monitoring wells were installed to help
define the downgradient extent of the petroleum groundwater plume.

The temporary wells were installed with a DPT rig and constructed of 1-inch diameter PVC casing
and with a 15 ft section of 10 slot well screen. Well construction specifics are presented in Table
1. Boring logs, temporary well construction records, and well abandonment records are included
in Appendix A.

Following installation, the wells were developed until readings of pH, conductivity, and
temperature stabilized. Once stabilization was reached, groundwater samples were collected and
placed in an iced cooler. The samples were delivered under standard chain-of-custody protocol to
Prism Laboratories, Inc. for analysis of VOCs by EPA Method 8260.

On October 7, 2015, H&H obtained top of casing (TOC) elevations and gauged the new temporary
monitoring wells and existing permanent monitoring wells. No free product was detected in any
of the monitoring wells (Table 1).

2.2 Soil Gas Sampling Activities

To assess the potential for vapor intrusion into off-site buildings, four SG sample points were
installed at the locations shown on Figure 3. The SG points were installed as described below and
were sampled in general accordance with the DEQ Vapor Intrusion Guidance dated April 2014
(VI Guidance). The soil gas sample points SG-9 and SG-12 were installed 5 to 7 ft above the
Mr. Jim Rudder
December 11, 2015
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groundwater table using a direct push technology (DPT) drill rig. Due to limited drill rig access,
soil gas sample points SG-10 and SG-11 were installed to depths of approximately 8 to 10 feet bgs
using a decontaminated stainless steel hand auger.

Soil borings were described for lithologic purposes, observed for the presence of staining and
odors, and field-screened for the presence of VOCs with a calibrated photo-ionization detector
(PID). Boring logs are presented in Appendix A.

Each vapor monitoring point was constructed with a 6-inch stainless steel sampling point at the
final depth. Teflon® tubing was secured to the screen and extended to the ground surface. Well
filter sand was placed around the annulus of the screened interval of the sample point, and extended
to approximately 6 inches above the top of the screen interval. A bentonite seal was placed above
the sand pack to grade and hydrated. The soil gas sample points were allowed to cure for a
minimum of 12 hours prior to sampling.

Prior to sampling, a leak check was conducted at each SG point by constructing a shroud around
the sampling point and flooding the air within the shroud with helium (He) gas until a He
atmosphere of 75% to 100% was achieved. A He gas detector was used to measure the % He
within the shroud. Once the levels within the shroud reached near saturation concentrations, vapor
from the monitoring point was purged and collected into a Tedlar® bag using a three way syringe.
Following the purge of vapor into the Tedlar® bag, the contents of the bag were analyzed using
the field He gas detector to ensure that He concentrations were less than 10% of the concentration
detected in the shroud.

Following successful field leak checks using He, vapor samples were collected from each sampling
location into 1.4-liter Summa canisters for laboratory analysis. The Summa canisters were filled
slowly using a lab-set airflow regulator over a period of approximately 60-65 minutes (less than
200 mL/min). As part of the testing, H&H collected measurements of ambient temperature at the
beginning, middle, and end of the sampling day.
Mr. Jim Rudder
December 11, 2015
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The Summa canisters were shipped to Con-Test Analytical Laboratory, a North Carolina certified
laboratory, under standard chain-of-custody protocol for analysis of VOCs by EPA Method TO-
15.

2.3 Well Abandonment and Investigation Derived Waste

Because significant soil impacts were not encountered, soil cuttings generated during the
additional assessment activities were spread on-site. Each boring was abandoned with bentonite
and/or grout and the ground surface was patched to match the surrounding area. The temporary
wells were abandoned in accordance with North Carolina regulations on October 12, 2015. Well
abandonment records are included in Appendix A.

3.0 Assessment Results

3.1 Groundwater Sampling Results

Results of the groundwater samples collected from TMW-6 and TMW-7 indicated VOC
concentrations above the 2L Groundwater Standards. Additionally, 1,2,4-trimethylbenzene,
benzene, ethylbenzene, toluene, and total xylenes were detected in these wells above the DEQ
Residential Vapor Intrusion Groundwater Screening Levels (GWSLs). Naphthalene also was
detected in TMW-6 above the Residential Vapor Intrusion GWSL. Concentrations in groundwater
are shown on Figure 2. A summary of the groundwater analytical data is provided in Table 2, and
the laboratory analytical report is included in Appendix B.

3.2 Soil Gas Sampling Results

Laboratory analytical results for the soil gas samples indicate that benzene, ethylbenzene, hexane,
methylene chloride, naphthalene, toluene, tetrachloroethylene, 1,2,4-trimethylbenzene, and
xylenes were detected above DENR Residential Soil Gas Screening Levels (SGSLs). No other
Mr. Jim Rudder
December 11, 2015
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VOCs were detected in the soil gas samples above specified DENR Residential SGSLs. A
summary of the soil gas vapor detections are provided in Table 3 and presented in Figure 3. The
laboratory analytical report is included in Appendix B.

4.0 Summary and Conclusions

H&H completed groundwater and soil gas assessment activities at the Central Avenue Apartments
Brownfields site located in Charlotte, Mecklenburg County, North Carolina. The assessment
activities included the collection and analysis of two groundwater samples and four soil gas
samples. The results of the assessment activities are summarized below.

• VOCs were detected above 2L Groundwater Standards in two temporary monitoring wells
located downgradient of the site. Additionally, 1,2,4-trimethylbenzene, benzene,
ethylbenzene, toluene, and total xylenes were detected in both wells and naphthalene was
detected in one well above the DEQ Residential Vapor Intrusion GWSLs.

• Benzene, ethylbenzene, hexane, methylene chloride, naphthalene, toluene,
tetrachloroethylene, 1,2,4-trimethylbenzene, and xylenes were detected above DENR
Residential SGSLs in soil gas samples located downgradient of the site. No other VOCs
were detected in the soil gas samples above specified DENR Residential SGSLs.

Based upon the results of the groundwater and soil gas assessment activities, vapor intrusion could
be a cause for concern to the off-site residential buildings and should be further evaluated. Based
on discussions with the Brownfields Program, H&H understands that any additional off-site
assessments will be completed by the DEQ Underground Storage Tank (UST) Section.

Mr. Jim Rudder
December 11, 2015
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H&H appreciates the opportunity to work with you on this project. If you have any questions or
require additional information, please do not hesitate to contact us at 704-586-0007.

Sincerely,

Hart & Hickman, PC
Stephen R. Libbey, PG Project Manager
cc: Mr. D. Porter Jones (via email)

Table 1
Summary of Groundwater Elevation Mesurements
Central Avenue Apartments Brownfields
Charlotte, North CarolinaH&H Job No. DPJ-001
\\hhfs01.harthickman.local\masterfiles\AAA-Master Projects\DPJ Residential LLC (DPJ)\BF Assessment\Additional GW Vapor Assessment\Report\GW Table12/11/2015 Hart & Hickman, PC
Monitoring DTW DTP DTW DTP
Well ID (ft)(ft)(ft)(ft)
Jun-15 Jun-15 Jun-15 Oct-15 Oct-15 Oct-15
MW-1 35 15-35 100.00 28.43 --71.57 28.43 --71.57
MW-2 35 15-35 98.86 25.94 --72.92 25.94 --72.92
MW-3 35 15-35 99.40 27.10 --72.30 27.10 --72.30
MW-4 35 15-35 99.68 27.93 --71.75 27.93 --71.75
MW-5 40 35-40 98.52 27.67 --70.85 27.67 --70.85
MW-6 40 25-40 99.73 28.40 --71.33 28.40 --71.33
MW-7 40 25-40 99.40 28.25 --71.15 28.25 --71.15
MW-8 40 25-40 98.46 28.58 --69.88 28.58 --69.88
MW-9 28 13-28 93.68 24.89 --68.79 24.89 --68.79
SB-1/TMW-1 38 23-38 97.49 32.03 --65.46
SB-5/TMW-2 39.5 24.5-39.5 97.27 30.50 --66.77
TMW-3 35 20-35 101.35 27.73 --73.62
TMW-4 38 23-38 95.53 30.25 --65.28
TMW-5 38 23-38 102.02 31.66 --70.36
TMW-6 25 10-25 80.78 15.89 --64.89
TMW-7 25 10-25 85.98 21.05 --64.93
Notes:
TOC = Top of PVC well casing; DTW = Depth to water from TOC; DTP = Depth to product from TOC;
ft bgs = Feet below ground surface; -- = No measurable free product; NI = Not Installed; ABN = Abandoned
Total Depth (ft
bgs)
Screen Interval (ft bgs)TOC Elevation (msl)
Relative Groundwater ElevationRelative Groundwater Elevation
ABN
ABN
NI
NI
ABN
ABN
ABN
Table 2
Summary of Groundwater Analytical Data
Central Avenue Apartments Brownfields
Charlotte, North Carolina
H&H Job No. DPJ-001
\\hhfs01.harthickman.local\masterfiles\AAA-Master Projects\DPJ Residential LLC (DPJ)\BF Assessment\Additional GW Vapor Assessment\Report\GW Table
12/11/2015 Hart & Hickman, PC
Sample ID TMW-6 TMW-7
Sample Date 10/2/2015 10/2/2015
Units (µg/L)(µg/L)(µg/L)(µg/L)
VOCs (8260B)
1,2,4-Trimethylbenzene 260 1,600 400 5.8
1,3,5-Trimethylbenzene 82 <500 400 NS
Benzene 4,700 14,000 1 15.9
Ethylbenzene 560 2,400 600 34.9
Isopropylbenzene 560 <500 70 NS
Naphthalene 310 <1,000 6 34.8
Styrene 34 <500 70 1,860
Toluene 4,700 35,000 600 3,840
Total Xylene 2,220 11,000 500 98.5
Notes:
Only those compounds detected in at least one sample shown above
1) 15A North Carolina Administrative Code 2L Groundwater Standards
2) Division of Waste Management Residential Vapor Intrusion Groundwater Screening Level
Bold indicates an exceedance of the NCAC 2L Standard
Highlighted indicates an exceedance of the Division of Waste Management Residential Vapor Intrusion Groundwater Screening Level.
Method number follows parameter in parenthesis
VOCs = volatile organic compounds; NS = screening criteria not specified
µg/L = micrograms per liter
2020 Hamorton Place 2028 Hamorton Place
15A NCAC 2L1
DWM VI Residential
Groundwater Screening
Level2
Screening Critera
Table 3
Summary of Soil Gas Analytical Data
Central Avenue Apartments Brownfields
Charlotte, North Carolina
H&H Job No. DPJ-001
\\hhfs01.harthickman.local\masterfiles\AAA-Master Projects\DPJ Residential LLC (DPJ)\BF Assessment\Additional GW Vapor Assessment\Report\SG Data Table
12/11/2015 Hart & Hickman, PC
Screening Criteria 2020 Hamorton
Place
2101 Central
Avenue
1427 Landis
Avenue
2028 Hamorton
Place
Sample ID SG-9 SG-10 SG-11 SG-12
Sample Date 10/1/2015 10/1/2015 10/1/2015 10/1/2015
Units (ug/m3)(ug/m3)(ug/m3)(ug/m3)(ug/m3)
VOCs (TO-15)
Acetone 216,000 <1,900 98 31 <1,900
Benzene 120 55,000 1.2 1.9 32,000
2-Butanone (MEK)34,800 <2,400 11 4.8 <2,400
Carbon Disulfide 4,870 120 1.6 1.3 96
Chloroform 40.7 <98 0.57 2.5 <98
Chloromethane 626 100 <1.1 1.1 <83
Cyclohexane 41,700 3,900 <0.92 <0.92 18,000
Dichlorodifluoromethane (Freon 12)695 87 1.6 1.7 <99
Ethanol NS <1,500 21 11 <1,500
Ethylbenzene 374 31,000 0.51 4.9 8,200
4-Ethyltoluene NS 5,200 0.50 5.7 1,300
Heptane NS 2,900 <1.1 6.8 12,000
Hexane 4,870 13,000 3.4 <38 79,000
Isopropanol 1,390 <2,000 <26 2.0 <2,000
Methylene Chloride 4,170 7,800 3.3 1.7 <690
Naphthalene 20.9 490 <1.4 0.87 63
Propylene 20,900 4,900 21 28 <1,400
Styrene 6,950 220 <1.1 <1.1 <85
Tetrachloroethylene 278 170 4.4 5.0 670
Toluene 34,800 49,000 12 58 13,000
Trichlorofluoromethane (Freon 11)4,870 180 1.6 1.6 <450
1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113)209,000 <610 2.1 1.6 52
1,2,4-Trimethylbenzene 48.7 26,000 1.2 7.3 2,500
1,3,5-Trimethylbenzene NS 6,000 0.26 1.8 1,500
Xylene, Total 695 87,000 2.86 23.3 21,600
Notes:1 NC Department of Environmental Quality (DEQ) Divison of Waste Management Residential Subslab and Exterior Soil Gas Screening Levels (September 2015)
Only those compounds detected in at least one sample shown above
Bold indicates an exceedance of the Residential Soil Gas Screening Level (SGSL)
VOCs = volatile organic compounds; NS = screening criteria not specified; µg/m3 = micro grams per cubic meter
DWM Residential SGSL1
SITE LOCATION MAP
CENTRAL AVENUE APARTMENTS
1931-2027 CENTRAL AVENUE
CHARLOTTE, NORTH CAROLINA
DATE:
JOB NO:
REVISION NO:
FIGURE NO:
12/11/2015 0
1DPJ-001
0 2000 4000
APPROXIMATE
SCALE IN FEET
N
U.S.G.S. QUADRANGLE MAP
7.5 MINUTE SERIES (TOPOGRAPHIC)
2923 S. Tryon Street, Suite 100Charlotte, NC 28203704.586.0007(p) 704.586.0373(f)
CHARLOTTE EAST, NORTH CAROLINA 1991
SITE
MW-5
MW-8
MW-7MW-6MW-1
MW-4
MW-3
MW-2
RESIDENCE
CENTRAL AVENUE
2013 CENTRAL AVENUE
(095-077-12)
MCLAMB GROUP
(2101 CENTRAL AVENUE)
2027 CENTRAL AVENUE
(095-077-13)
PARTS WASHER
MW-9
2020 Hamorton
Place
2009 CENTRAL
AVENUE
(095-077-36)
2028 Hamorton
Place
1427
Landis
Avenue
JOB NO. DPJ-001
REVISION NO. 0DATE: 12-11-15
FIGURE NO. 2
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
CENTRAL AVENUE APARTMENTS
1931-2027 CENTRAL AVENUE
CHARLOTTE, NORTH CAROLINA
GROUNDWATER SAMPLE LOCATIONS MAP
LEGEND
SITE PROPERTY BOUNDARY
APPROXIMATE EXTENT OF
CELLAR
APPROXIMATE FUTURE BUILDING
FOOTPRINT
POLE MOUNTED TRANSFORMER
MONITORING WELL LOCATION
TEMPORARY
MONITORING WELL LOCATION
&21&(175$7,21ȝJ/
TMW-6
BENZENE 160
SAMPLE ID
NOTES:
1.ONLY COMPOUNDS EXCEEDING THE 15A NCAC 2L GROUNDWATER
STANDARDS IN AT LEAST ONE SAMPLE SHOWN.
2.HIGHLIGHTED INDICATES EXCEEDANCE OF RESIDENTIAL VAPOR
INTRUSION GROUNDWATER SCREENING LEVEL.
COMPOUND
TMW-6
1,2,4-TRIMETHYLBENZENE 260
BENZENE 4,700
ETHYLBENZENE 560
ISOPROPYLBENZENE 560
NAPHTHALENE 310
TOLUENE 4700
XYLENES 2,220
TMW-7
1,2,4-TRIMETHYLBENZENE 1,600
BENZENE 14,000
ETHYLBENZENE 2,400
ISOPROPYLBENZENE <500
NAPHTHALENE <1,000
TOLUENE 35,000
XYLENES 11,000
MW-5
MW-8
MW-7MW-6MW-1
MW-4
MW-3
MW-2
RESIDENCE
CENTRAL AVENUE
2013 CENTRAL AVENUE
(095-077-12)
MCLAMB GROUP
(2101 CENTRAL AVENUE)
2027 CENTRAL AVENUE
(095-077-13)
PARTS WASHER
MW-9
2020 Hamorton
Place
2009 CENTRAL
AVENUE
(095-077-36)
2028 Hamorton
Place
1427
Landis
Avenue
JOB NO. DPJ-001
REVISION NO. 0DATE: 12-11-15
FIGURE NO. 3
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
CENTRAL AVENUE APARTMENTS
1931-2027 CENTRAL AVENUE
CHARLOTTE, NORTH CAROLINA
SOIL GAS SAMPLE LOCATIONS MAP
LEGEND
SITE PROPERTY BOUNDARY
APPROXIMATE EXTENT OF
CELLAR
APPROXIMATE FUTURE BUILDING
FOOTPRINT
MONITORING WELL LOCATION
SOIL GAS POINT
&21&(175$7,21ȝJP3)
SAMPLE ID
NOTES:
1.ONLY COMPOUNDS EXCEEDING THE DENR RESIDENTIAL SGSLS IN EACH
SAMPLE SHOWN.
2.SGSL = DENR SOIL GAS SCREENING LEVEL.
SG-1
BENZENE 350
CONTAMINANT
SG-9
BENZENE 55,000
ETHYLBENZENE 31,000
HEXANE 13,000
METHYLENE CHLORIDE 7,800
NAPHTHALENE 490
TOLUENE 49,000
1,2,4-TMB 26,000
XYLENES 87,000
SG-12
BENZENE 32,000
ETHYLBENZENE 8,200
HEXANE 79,000
NAPHTHALENE 63
PCE 670
TOLUENE 13,000
1,2,4-TMB 2,500
XYLENES 21,600
SG-11
VOCs <SGSLsSG-10
VOCs <SGSLs

Appendix A Boring Logs
Organic grassy Topsoil
Moist, Slightly stiff, dark brown sandy SILT
Slightly moist, medium, red and brown SILT
Moist, medium, dull orange and brown SILT
Very moist, medium, dull orange and tan SILT with traceclay and no odor
Wet, medium, tan and gray SILT with strong odor
Wet, very stiff, tan and gray SILT with saprolite and strongodor
Wet, hard, tan and gray SILT with saprolite and strongodor
Bottom of borehole at 25.0 feet.
0.1
1.4
1.6
1.6
2.8
4.2
25.9
25.7
954.5
729.8
556.3
303.1
0
0
0
0
0
0
0
0
0
0
0
0
1" PVCRiser
BentoniteSeal
FIlter Sand
0.0100"Slotted
Screen
FIlter Sand
DRAWN BY:KJW
BORING COMPLETED:10/1/15
DRILLING CONTRACTOR:Geologic Exploration Remarks:
DRILL RIG/ METHOD:Geoprobe 8040DT / HA/DPT
SAMPLING METHOD:DPT Sleeves Installed temporary monitoring well,screened from 10-25 feet bgs.
BORING STARTED:10/1/15
LOGGED BY:KJW
TOTAL DEPTH: 25 ft.
TOP OF CASING ELEV:
DEPTH TO WATER:
DE
P
T
H
(f
t
)
DE
P
T
H
(f
t
)MATERIAL DESCRIPTION
LI
T
H
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SA
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P
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BK
G
.
BL
O
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CO
U
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S
(N

V
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)
WELL DIAGRAM
OV
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(
p
p
m
)
RE
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Sheet 1 of 1
BORING NUMBER TMW-6
PROJECT:Central Ave Brownfields
JOB NUMBER:DPJ.001
LOCATION:Charlotte, NC
WE
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2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
3334 Hillsborough Street
Raleigh, North Carolina 27607
919-847-4241(p) 919-847-4261(f)
0
5
10
15
20
25
0
5
10
15
20
25
Slightly moist, medium, dull red clayey SILT
Moist, medium, dull red orange SILT
Saturated, soft, dull red SILT with slight odor
Very moist, slightly stiff, dull orange and brown SILT withodor
Wet, slightly stiff, dull orange and brown SILT with odor
Saturated, slightly stiff, dull orange and brown SILT withstrong odor
Saturated, slightly stiff, dull orange and brown SILT withsaprolite and strong odor
Bottom of borehole at 25.0 feet.
1.1
1.7
14.3
9.3
25.9
9.9
53.8
64.5
69.1
72
2716
1635
0
0
0
0
0
0
0
0
0
0
0
0
1" PVCRiser
BentoniteSeal
FIlter Sand
0.0100"Slotted
Screen
FIlter Sand
DRAWN BY:KJW
BORING COMPLETED:10/1/15
DRILLING CONTRACTOR:Geologic Exploration Remarks:
DRILL RIG/ METHOD:Geoprobe 8040DT / HA/DPT
SAMPLING METHOD:DPT Sleeves Installed temporary monitoring well,screened from 10-25 feet bgs.
BORING STARTED:10/1/15
LOGGED BY:KJW
TOTAL DEPTH: 25 ft.
TOP OF CASING ELEV:
DEPTH TO WATER:
DE
P
T
H
(f
t
)
DE
P
T
H
(f
t
)MATERIAL DESCRIPTION
LI
T
H
O
L
O
G
Y
SA
M
P
.
BK
G
.
BL
O
W
CO
U
N
T
S
(N

V
A
L
U
E
)
WELL DIAGRAM
OV
A

(
p
p
m
)
RE
C
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V
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(
%
)
SA
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T
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Sheet 1 of 1
BORING NUMBER TMW-7
PROJECT:Central Ave Brownfields
JOB NUMBER:DPJ.001
LOCATION:Charlotte, NC
WE
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H
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M
A
N
.
G
D
T

-

1
0
/
2
/
1
5

1
3
:
5
8

-

S
:
\
A
A
A
-
M
A
S
T
E
R

G
I
N
T

P
R
O
J
E
C
T
S
\
D
P
J
.
0
0
1

C
E
N
T
R
A
L

A
V
E

S
E
P
T

2
0
1
5
.
G
P
J
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
3334 Hillsborough Street
Raleigh, North Carolina 27607
919-847-4241(p) 919-847-4261(f)
0
5
10
15
20
25
0
5
10
15
20
25
Organic grassy Topsoil
Moist, soft, dark brown gravelly SILT
Moist, medium, dull red clayey SILT
Slightly moist, medium, dull orange and tan SILT
Moist, medium, dull orange and tan SILT
Bottom of borehole at 11.5 feet.
2
3
3.9
3.3
3.1
3.9
0
0
0
0
0
0
DRAWN BY:KJW
BORING COMPLETED:10/1/15
DRILLING CONTRACTOR:Geologic Exploration Remarks:
DRILL RIG/ METHOD:Geoprobe 8040DT / HA/DPT
SAMPLING METHOD:DPT Sleeves Installed soil gas point 11.5 feet bgs.
BORING STARTED:10/1/15
LOGGED BY:KJW
TOTAL DEPTH: 11.5 ft.
TOP OF CASING ELEV:
DEPTH TO WATER:
DE
P
T
H
(f
t
)
DE
P
T
H
(f
t
)MATERIAL DESCRIPTION
LI
T
H
O
L
O
G
Y
SA
M
P
.
BK
G
.
BL
O
W
CO
U
N
T
S
(N

V
A
L
U
E
)
WELL DIAGRAM
OV
A

(
p
p
m
)
RE
C
O
V
E
R
Y

(
%
)
SA
M
P
L
E

T
Y
P
E
NU
M
B
E
R
Sheet 1 of 1
BORING NUMBER SG-9
PROJECT:Central Ave Brownfields
JOB NUMBER:DPJ.001
LOCATION:Charlotte, NC
WE
L
L

L
O
G

-

H
A
R
T

H
I
C
K
M
A
N
.
G
D
T

-

1
0
/
2
/
1
5

1
3
:
5
8

-

S
:
\
A
A
A
-
M
A
S
T
E
R

G
I
N
T

P
R
O
J
E
C
T
S
\
D
P
J
.
0
0
1

C
E
N
T
R
A
L

A
V
E

S
E
P
T

2
0
1
5
.
G
P
J
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
3334 Hillsborough Street
Raleigh, North Carolina 27607
919-847-4241(p) 919-847-4261(f)
0.0
2.5
5.0
7.5
10.0
0.0
2.5
5.0
7.5
10.0
Organic grassy Topsoil
Moist, slightly stiff, dull red SILT
Slightly moist, very stiff, dull red clayey SILT
Moist, medium, dull red and tan SILT
Moist, slightly stiff, dull red and orange SILT with no odor
Bottom of borehole at 10.0 feet.
0
0.1
0
0.1
0.1
0
0
0
0
0
DRAWN BY:KJW
BORING COMPLETED:10/1/15
DRILLING CONTRACTOR:Geologic Exploration Remarks:
DRILL RIG/ METHOD:Hand Auger / HA
SAMPLING METHOD:Auger Cuttings Installed soil gas point 10 feet bgs.
BORING STARTED:10/1/15
LOGGED BY:KJW
TOTAL DEPTH: 10 ft.
TOP OF CASING ELEV:
DEPTH TO WATER:
DE
P
T
H
(f
t
)
DE
P
T
H
(f
t
)MATERIAL DESCRIPTION
LI
T
H
O
L
O
G
Y
SA
M
P
.
BK
G
.
BL
O
W
CO
U
N
T
S
(N

V
A
L
U
E
)
WELL DIAGRAM
OV
A

(
p
p
m
)
RE
C
O
V
E
R
Y

(
%
)
SA
M
P
L
E

T
Y
P
E
NU
M
B
E
R
Sheet 1 of 1
BORING NUMBER SG-10
PROJECT:Central Ave Brownfields
JOB NUMBER:DPJ.001
LOCATION:Charlotte, NC
WE
L
L

L
O
G

-

H
A
R
T

H
I
C
K
M
A
N
.
G
D
T

-

1
0
/
2
/
1
5

1
3
:
5
8

-

S
:
\
A
A
A
-
M
A
S
T
E
R

G
I
N
T

P
R
O
J
E
C
T
S
\
D
P
J
.
0
0
1

C
E
N
T
R
A
L

A
V
E

S
E
P
T

2
0
1
5
.
G
P
J
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
3334 Hillsborough Street
Raleigh, North Carolina 27607
919-847-4241(p) 919-847-4261(f)
0.0
2.5
5.0
7.5
10.0
0.0
2.5
5.0
7.5
10.0
Slightly moist, slightly stiff, reddish brown clayey SILT
Moist, slightly stiff, reddish brown clayey SILT with blackmottling
Moist, tan clayey SILT with black mottling and gravel
Bottom of borehole at 8.0 feet.
0
0
0
0
0
0
0
0
DRAWN BY:KJW
BORING COMPLETED:10/1/15
DRILLING CONTRACTOR:Geologic Exploration Remarks:
DRILL RIG/ METHOD:Hand Auger / HA
SAMPLING METHOD:Auger Cuttings Installed soil gas point 8 feet bgs.
BORING STARTED:10/1/15
LOGGED BY:KJW
TOTAL DEPTH: 8 ft.
TOP OF CASING ELEV:
DEPTH TO WATER:
DE
P
T
H
(f
t
)
DE
P
T
H
(f
t
)MATERIAL DESCRIPTION
LI
T
H
O
L
O
G
Y
SA
M
P
.
BK
G
.
BL
O
W
CO
U
N
T
S
(N

V
A
L
U
E
)
WELL DIAGRAM
OV
A

(
p
p
m
)
RE
C
O
V
E
R
Y

(
%
)
SA
M
P
L
E

T
Y
P
E
NU
M
B
E
R
Sheet 1 of 1
BORING NUMBER SG-11
PROJECT:Central Ave Brownfields
JOB NUMBER:DPJ.001
LOCATION:Charlotte, NC
WE
L
L

L
O
G

-

H
A
R
T

H
I
C
K
M
A
N
.
G
D
T

-

1
0
/
2
/
1
5

1
3
:
5
8

-

S
:
\
A
A
A
-
M
A
S
T
E
R

G
I
N
T

P
R
O
J
E
C
T
S
\
D
P
J
.
0
0
1

C
E
N
T
R
A
L

A
V
E

S
E
P
T

2
0
1
5
.
G
P
J
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
3334 Hillsborough Street
Raleigh, North Carolina 27607
919-847-4241(p) 919-847-4261(f)
0.0
2.5
5.0
7.5
0.0
2.5
5.0
7.5
Slightly moist, medium, dull red clayey SILT
Moist, medium, dull red and orange SILT
Moist, very stiff dull orange and brown SILT with traceodor
Bottom of borehole at 14.0 feet.
1.3
1.9
6.3
9.7
16.3
20.6
40.2
0
0
0
0
0
0
0
DRAWN BY:KJW
BORING COMPLETED:10/1/15
DRILLING CONTRACTOR:Geologic Exploration Remarks:
DRILL RIG/ METHOD:Geoprobe 8040DT / HA/DPT
SAMPLING METHOD:DPT Sleeves Installed soil gas point 14 feet bgs.
BORING STARTED:10/1/15
LOGGED BY:KJW
TOTAL DEPTH: 14 ft.
TOP OF CASING ELEV:
DEPTH TO WATER:
DE
P
T
H
(f
t
)
DE
P
T
H
(f
t
)MATERIAL DESCRIPTION
LI
T
H
O
L
O
G
Y
SA
M
P
.
BK
G
.
BL
O
W
CO
U
N
T
S
(N

V
A
L
U
E
)
WELL DIAGRAM
OV
A

(
p
p
m
)
RE
C
O
V
E
R
Y

(
%
)
SA
M
P
L
E

T
Y
P
E
NU
M
B
E
R
Sheet 1 of 1
BORING NUMBER SG-12
PROJECT:Central Ave Brownfields
JOB NUMBER:DPJ.001
LOCATION:Charlotte, NC
WE
L
L

L
O
G

-

H
A
R
T

H
I
C
K
M
A
N
.
G
D
T

-

1
0
/
2
/
1
5

1
3
:
5
8

-

S
:
\
A
A
A
-
M
A
S
T
E
R

G
I
N
T

P
R
O
J
E
C
T
S
\
D
P
J
.
0
0
1

C
E
N
T
R
A
L

A
V
E

S
E
P
T

2
0
1
5
.
G
P
J
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
3334 Hillsborough Street
Raleigh, North Carolina 27607
919-847-4241(p) 919-847-4261(f)
0.0
2.5
5.0
7.5
10.0
12.5
15.0
0.0
2.5
5.0
7.5
10.0
12.5
15.0

Appendix B Laboratory Analytical Reports

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