22074_Gathing Motor_UST Closure Report 20070205

Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
UNDERGROUND STORAGE TANK CLOSURE REPORT
FORMER GATHINGS MOTOR COMPANY
1216, 1220 AND 1222 SOUTH TRYON STREET
CHARLOTTE, NORTH CAROLINA 28203
I. General Information
A. Ownership of UST(s)

1. Name of UST owner, owner address and telephone number:
Gathings Motor Company (no longer in business)
No address or telephone number available.

B. Facility Information

1. Facility name: Gathings Motor Company (Automotive Sales and Repair
Shop)

2. Facility ID #: No Facility ID#.

3. Facility address, telephone number and county:
1216, 1220 and 1222 South Tryon Street
Charlotte, North Carolina 28203
Site Telephone No.: 704/331-8007
Mecklenburg County
C. Contacts

1. Name, address, telephone number and job title of current property owner
contact person:
New Tryon, LLC
Care of Insite Properties, LLC
Mr. Tony Pizzo, Agent
100 North Tryon Street, Suite 2650
Charlotte, North Carolina 28202
[phone]
2. Name, address and telephone number of closure contractor:

Mr. Brinkley Isaacs
McCall Brothers
1008 Kelly Circle
Shelby, North Carolina 28150
[phone]
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
3. Name, address and telephone number of primary consultant:
Mr. Robert C. Foster, P.G.
MACTEC Engineering and Consulting, Inc.
2801 Yorkmont Road
Charlotte, North Carolina 28208
[phone]

4. Name, address, telephone number, and State certification number of
laboratory:

Shealy Environmental Services, Inc.
106 Vantage Point Drive
West Columbia, South Carolina 29172
[phone]
North Carolina Certification No. 329

D. UST Information

Tank
Number
Installation
Date
Approximate
Size in
Gallons
Tank
Dimensions
Last
Contents
Previous
Contents (if
any)
1 unknown 1,000 10.5’ x 4’ Fuel Oil Same
2 unknown 2,000 12’ x 5.5’ Gasoline Same
3 unknown 550 5.5’ x 4’ Used Oil Same
4 unknown 1,000
Non-uniform
shape (4’W x
8’L x 6.5’H)
Oil/Water
Separator Same

E. Site Characteristics

1. Describe any past releases at this site:

MACTEC was provided no information relative to past known releases
of petroleum products at this site.

2. Is the facility active or inactive at this time? If the facility is inactive note the
last time the USTs were in operation:

The property is no longer actively used as an automotive sales and
repair facility. The properties were recently purchased by
MACTEC’s client, New Tryon, LLC.
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
A small automotive detailing business was operating from the 1222
South Tryon Street building during the performance of MACTEC’s
work. The USTs were reportedly last used by Gathings Motor
Company in the 1960’s and 1970’s.
3. Describe surrounding property use (for example, residential, commercial,
farming, etc.)

The properties to the northeast were occupied by attorney offices
(1208 South Tryon Street) and medical offices, namely Carolina
Hematology and Oncology Associates, (1100 South Tryon Street), to
the southeast (across South Tryon Street) by Camden South End
apartment and parking complex (1211 South Tryon Street), to the
southwest by a retail and office space, and to the northwest by
warehouse. A Site Vicinity Map is included as Figure 1.
4. Describe site geology/hydrogeology
The site is located within the Charlotte Belt of the Piedmont
Physiographic Province consisting of low rounded hills and long
rolling northeast to southwest trending ridges with incised creek
channels. Based on a review of the geologic map, the site is underlain
by granitic rock.
The Soil Survey of Mecklenburg County indicates that soils at the site
are classified as Urban Land. These soils natural characteristics have
been altered or destroyed by construction activities. According to the
National Wetlands Inventory Map, no wetlands were identified on the
property.
Based on the USGS topographic map, the elevation of the site is
approximately 750 feet above mean sea level. Surface drainage
patterns within the Piedmont typically indicate the direction
contaminants would be transported by surface water or groundwater.
Based on our interpretation of the topographic map and on-site
observations, surface water on the site would be expected to flow to
the northwest and west toward Irwin Creek and unnamed tributaries
of Irwin Creek.
The direction and movement of groundwater through soil is
dependent on soil type and the presence of relict structures and
textures of the underlying rock. Fractures, faults, folds and foliation
planes affect the migration of groundwater in rock. Since no
significant geologic features were identified in or on the site, it is
reasonable to assume that the direction of on-surface ground-water
flow under static conditions (no pumping interference) approximates
the surface topography of the site. Groundwater at the site is expected
to flow to the northwest and west toward Irwin Creek and unnamed
tributaries of Irwin Creek.
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932

II. Closure Procedures
A. Describe preparations for closure including the steps taken to notify authorities,
permits obtained and the steps taken to clean and purge the tanks:
The UST-2 form (Appendix D) provides information on the closure
performed by McCall Brothers Inc.
B. Note the amount of residual material pumped from the tank(s):

Approximately 500 gallons of waste oil and water was removed from
the Tanks 1 and 3 by Haz-Mat Transportation and Disposal, Inc. on
December 21, 2006. On this date, Tank 2 was noted to be empty.
Approximately 650 gallons of sludge was removed from Tank 4
(oil/water separator) by Haz-Mat Transportation and Disposal, Inc.
on January 3 and 4, 2006. The waste manifests for removal and
disposal are included in Appendix C.
C. Describe the storage, sampling and disposal of the residual material:

The waste oil and sludge was pumped into a tanker truck and hauled
to Haz-Mat Transportation and Disposal, Inc. in Charlotte, North
Carolina for disposal. The material was treated as non-hazardous,
and no sampling or analytical testing was performed.

D. Excavation

1. Describe excavation procedures noting the condition of the soils and the
dimensions of the excavation in relation to the tanks, piping and/or pumps:

Tank 1
Tank 1 was removed on December 21, 2006. Initially, the concrete
and asphalt overlying the tank was removed. Reddish brown sandy
silt was excavated from atop the tank and along the sides using a
backhoe. The soil surrounding and beneath the tank exhibited
greenish-gray discoloration and strong odor which was considered
evidence of a petroleum release.
The excavation dimensions for the 1,000-gallon tank were
approximately 16 feet by 8 feet with a depth of approximately 8.5 feet.
Tank 1 was buried approximately 4 feet below grade and measured
approximately 10.5 feet long and was 4 feet in diameter. The product
supply and return lines were observed approximately 2 feet below the
ground surface between the tank and the building (Figure 2). When
the tank was in service, the fuel in the tank was dispensed directly to a
boiler, thus no product pumps were present.
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
After receiving laboratory results for soil samples at the UST removal,
MACTEC returned to the site on January 11 and 12, 2007 to excavate
additional soil affected by the petroleum release. The soil remediation
activities are summarized in Section II E. below.
Tank 2
Tank 2 was removed on January 2, 2007. Asphalt overlying the tank
was removed. Asphalt base materials and reddish brown sandy silt
was excavated from atop the tank and along the sides using a backhoe.
The soil beneath Tank 2 did not exhibit visible staining, odor or other
evidence of a petroleum release.
The excavation dimensions for the 2,000-gallon tank were
approximately 16 feet by 9 feet with a depth of approximately 9 feet.
Tank 3 was located adjacent to Tank 2. When both tanks were
excavated, the excavation dimensions were approximately 17.5 feet by
9 feet with the same depth of 9 feet. Tank 2 was buried
approximately 4 feet deep and measured approximately 12 feet long
and 5.5 feet in diameter. The product supply and return lines were
situated in the soil approximately 2 feet below the surface (Figure 3).
Gasoline was formerly dispensed to a pump which was not present but
formerly located at the corner of the adjacent building (Figure ). An
in-service natural gas line (and meter) lie over the product line in
vicinity of the pump area. Therefore, the product line was not
excavated, but drained and capped at both ends. Samples were taken
with a hand auger to assess soil along the product line and at the
former pump location.
Tank 3
Tank 3 was removed on January 2, 2007. Asphalt overlying the tank
was removed. Asphalt base materials and reddish brown sandy silt
was excavated from atop the tank and along the sides using a backhoe.
The soil beneath Tank 3 exhibited evidence of a petroleum release.
The excavation dimensions for the 550-gallon tank were
approximately 11.5 feet by 9 feet with a depth of approximately 9 feet.
Tank 3 was buried approximately 5 feet deep and measured
approximately 5.5 feet long and 4 feet in diameter. No product supply
or return lines were observed (Figure 3).
After receiving laboratory results for soil samples at the UST removal,
MACTEC returned to the site on January 23 and 24, 2007 to excavate
additional soil affected by the petroleum release. The soil remediation
activities are summarized in Section II E. below.
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
Tank 4
Tank 4 was removed on January 4, 2007. Asphalt overlying the tank
was removed. Asphalt base materials and reddish brown sandy silt
was excavated from atop the tank and along the sides using a backhoe.
The soil beneath the tank did not exhibit evidence of a petroleum
release.
The excavation dimensions for the approximately 1,000-gallon
oil/water separator were approximately 8 feet by 17 feet with a depth
of 7 feet. The irregular-shaped oil/water separator (Photograph 6)
measured approximately 8 feet long by 4 feet wide. It had varying
depths from 3 to 6.5 feet to accommodate a baffle system used for
oil/water separation. The feed and discharge lines were situated in the
soil approximately 2 feet below the surface. Two access holes were
located on top of the tank.
The former Tank 4 location is shown on Figure 3. Photographs of
UST closure activities are provided in Appendix B.

2. Note the depth of tank burial(s) (from land surface to top of tank):

The four USTs were buried to depths ranging from approximately 3
to 4.5 feet below ground surface.

3. Quantity of soil removed:

Approximately 270 tons of petroleum-affected soil was removed from
the area of Tank 1 and disposed of at Environmental Soils, Inc in
Lattimore, North Carolina.The manifests for removal and disposal
are included in Appendix C.
Approximately 15 tons of petroleum-affected soil was removed from
the area of Tank 3 and transported to HAZ-MAT Transportation and
Disposal, Inc. for treatment and final disposal at a permitted landfill.
The manifests for removal and disposal are included in Appendix C.
4. Describe soil type(s):
The sidewalls of the excavation and surrounding soil were described
by the on-site geologist as reddish brown sandy silt.

Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
5. Type and source of backfill used:

Portions of the soil from the excavations associated with Tanks 2 and
4 showed no signs of petroleum impact. Therefore, this soil was used
as backfill. McCall Brothers brought additional fill dirt to the site for
use in backfilling the excavations associated with the four tanks.
E. Contaminated Soil

1. Describe how it was determined to what extent to excavate the soil:
No visible or olfactory indications of contaminated soil were observed
on the excavation sidewalls or bottom of the excavations of Tank 2
and 4. Therefore, no over-excavation was performed.
The initial excavation of Tank 1 revealed greenish-gray discolored soil
indicating a petroleum release from the tank. The Tank 1 excavation
remained open until MACTEC returned to the site on January 10 and
11, 2007 with its subcontractor, McCall Brothers, to perform
additional soil excavation. The planned excavation was based on the
observations made on the day the tank was removed, as well as
analytical soil results from samples T1A and T1B. The excavation was
extended toward the north around the corner of the building (see
Figure 2) based on obvious petroleum staining. Additional soil was
excavated based on visible indications and to the extent allowable
limited by the building foundation (Figure 2). Confirmation samples
(T-1 Bottom, T-1 North, T-1 South, T-1 East, T-1 West, BD-2, BD-3,
BD-4, and BD-5) were taken along the bottom and sidewalls of the
excavation to confirm the effectiveness of the remedial effort.
Greenish-gray stained soil was noted beneath the building foundation.
MACTEC’s client suggested that the remaining affected soil be
excavated following demolition of the site building. Sample BD-3 was
collected from the stained soil to assess the environmental quality of
the material.
Sample BD-1 was collected from excavated soil and analyzed for
disposal characterization purposes.
The soil encountered around Tank 3 on the day the tank was removed
suggested a petroleum release had occurred. Therefore, MACTEC
returned to the site on January 23 and 24, 2007 with its subcontractor,
McCall Brothers, to perform additional soil excavation. The planned
excavation was based on the analytical soil results from sample T3B
which identified TPH at 760 parts per million. Additional soil was
excavated based on visible and olfactory indications and to the extent
allowable limited by building foundations and the property line
(Figure 3). Confirmation samples (T-3 Bottom, T-3 East, T-3 West, T-
3 North, and T-3 South) were taken along the bottom and the
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
sidewalls of the excavation to confirm the effectiveness of the remedial
effort.
2. Describe method of temporary storage, sampling and treatment/disposal of
soil:

Soil was temporarily stored on site in stockpiles situated on asphalt
pavement. The soil was covered with plastic sheeting to keep it dry. A
composite sample was analyzed for TPH, GRO and TPH, DRO by
Shealy Environmental Services, Inc.
Approximately 270 tons of petroleum-affected soil was removed from
the area of Tank 1 and disposed of at Environmental Soils, Inc in
Lattimore, North Carolina.The manifests for removal and disposal
are included in Appendix C.
Approximately 15 tons of petroleum-affected soil was removed from
the area of Tank 3 and transported to HAZ-MAT Transportation and
Disposal, Inc. for treatment and final disposal at a permitted landfill.
The manifests for removal and disposal are included in Appendix C.
III. Site Investigation

A. Provide information on field screening and observations, include methods used to
calibrate field screening instrument(s):
No field screening instruments were used at the site.
B. Describe soil sampling points and sampling procedures used.

Tank 1
Two closure soil samples (T1A and T1B) were collected at the bottom
of the Tank 1 excavation at a depth of 8 feet below surface. Samples
were collected directly from the backhoe bucket using a new pair of
nitrile gloves. Since the tank was greater than 6 feet but less than 20
feet in length, two soil samples were collected from directly beneath
the mid-line of the former tank. The samples were analyzed by the
laboratory for Total Petroleum Hydrocarbons (TPH), Gasoline Range
Organics (GRO) by EPA Method 8015, and Diesel Range Organics
(DRO) by EPA Method 3545/8015.
Additional soil was excavated and nine “confirmation” samples were
collected for laboratory analysis, with seven being from each of the
excavation sidewalls, and two representing the bottom of the
excavation. The sidewall excavation samples were collected at
approximate lateral centers, and at depths ranging from 6 to 8 feet
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
below grade level. The bottom samples were collected at depths of 13
and 15 feet below grade.
At MACTEC’s request, the laboratory tested the confirmation soil
samples for risk-based parameters including volatile organic
compounds (EPA Method 8260/5035B), semi-volatile organic
compounds (EPA Method 8270), and volatile petroleum compounds
(VPH) and extractable petroleum hydrocarbons (EPH) according to
the methods of the Massachusetts Department of Environmental
Protection. Sample locations are presented on Figure 2.
Tank 2
Two closure soil samples (T2A and T2B) were collected at the bottom
of the Tank 2 excavation at a depth of 10 to 11 feet below surface.
Samples were collected using the same procedures specified for Tank
1. Since the tank was greater than 6 feet but less than 20 feet in
length, two soil samples were collected from directly beneath the mid-
line of the former tank. A third soil sample (T2C) was collected from
a depth of approximately 1.5 feet beneath the product piping. A
fourth sample (T2D) was collected from beneath the former pump at a
depth of approximately 1.5 feet below grade. Both samples from
beneath the product line and pump were collected manually using a
hand auger. The samples were analyzed by the laboratory for TPH,
GRO by EPA method 8015.
Tank 3
Two closure soil samples (T3A and T3B) were collected at the bottom
of the Tank 3 excavation at a depth of 8 to 9 feet below surface.
Samples were collected using the same procedures specified for Tanks
1 and 2. Since the tank was approximately 6 feet in length, two soil
samples were collected from directly beneath the mid-line of the
former tank. The samples were analyzed by the laboratory for TPH,
GRO by EPA method 8015, TPH, DRO by EPA method 3545/8015,
and total metals (Chromium and Lead) by EPA method 3050.
Additional soil was excavated and five “confirmation” samples were
collected for laboratory analysis, with four being from each of the
excavation sidewalls, and one representing the bottom of the
excavation. The sidewall excavation samples were collected at
approximate lateral centers, and at a depth of approximately eight
feet below grade level. The bottom sample was collected at a depth of
approximately 15 feet below grade.
At MACTEC’s request, the laboratory tested the confirmation soil
samples for risk-based parameters including volatile organic
compounds (EPA Method 8260/5035B), semi-volatile organic
compounds (EPA Method 8270), and volatile petroleum compounds
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
(VPH) and extractable petroleum hydrocarbons (EPH) according to
the methods of the Massachusetts Department of Environmental
Protection. Sample locations are presented on Figure 3.
Tank 4
Two closure soil samples (OWS-1 and OWS-2) were collected at the
bottom of the Tank 4 excavation at a depth of 8 feet below surface.
Samples were collected using the same procedures specified for Tanks
1, 2 and 3. Two soil samples were collected from directly beneath the
mid-line of the former tank. The samples were analyzed by the
laboratory for TPH, GRO by Method 8015, TPH, DRO by Method
3545/8015, and total metals (Chromium and Lead) by EPA Method
3050/6010B. Sample locations are presented on Figure 3.
C. Describe groundwater or surface water sampling procedures used.

MACTEC did not observe evidence of groundwater in the excavations
during the tank removal activities.
D. Quality control measures

Each sample was collected directly from the backhoe bucket using a
new pair of disposable gloves, placed into laboratory-prepared sample
containers, and stored on ice. The samples were delivered under
chain-of-custody protocol to Shealy Environmental Services, Inc. in
West Columbia, South Carolina.
E. Investigation results

The results of the laboratory analysis identified TPH-GRO and TPH-
DRO in the soil samples submitted for Tanks 1, 3 and 4. The
concentrations exceeded the NCDENR action level cleanup standard
of 10 mg/kg at these locations. Following over-excavation of
contaminated soil, at Tanks 1 and 3, additional samples were collected
and analyzed. Summaries of the results are provided in Tables 1, 2
and 3 below. Copies of the laboratory analytical data reports are
provided in Appendix A.
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
Table 1: Analytical Results of Closure Soil Samples
Sample Number
Depth of
Sample
(ft bgs)
TPH-GRO
(mg/kg)
TPH-DRO
(mg/kg)
Chromium
(mg/kg)
Lead
(mg/kg)
T1A 8 890 17,000 --- ---
T1B 8 420 14,000 --- ---
T2A 10-11 ND --- --- ---
T2B 10-11 0.53 --- --- ---
T2C 2.5 ND --- --- ---
T2D 1.5 ND --- --- ---
T3A 8-9 ND 7.7 67 83
T3B 8-9 0.77 760 26 16
OWS-1 8 ND 110 98 12
OWS-2 8 ND 8.7 65 6.7
State Action Level -- 10 10 1226 400

Notes: --- Not analyzed
ND Not detected

Underground Storage Tank Closure Report February 5, 2007 Former Gathings Motor Company, Charlotte, North Carolina MACTEC Project No. 6228-06-3932 Table 2: Tank 1 Confirmation Soil Analytical Results CompoundT-1 BottomT-1 NorthT-1 SouthT-1 East T-1 WestBD-2 BD-3 BD-4 BD-5 Soil-to-WaterMSCCResidentialMSCCDepth in feet > 13 7 7-8 7 7 15 5-6 6 6 -- Acetone < 0.002 <0.0018 < 0.002 0.028 <0.0017 <0.0016 <0.86 <.0016 <.0016 2.8 1564 Aliphatics, C5-C8 <2.59 <1.97 <2.09 <2.15 <2.25 <1.93 205 <2.74 <2.84 72 939 Aliphatics, C9-C18 5.49 2.49 J 2.47 J 2.65 J 4.09 J 2.25 J 6,310<2.74 <2.84 3300 9386 Aliphatics, C19-C36 <4.84 <4.79 <4.99 <4.58 <4.24 <4.24 24.9 <2.74 <2.84 ## 93860 Aromatics, C9-C22 <7.74 <7.76 <7.98 <7.33 <6.79 <6.78 2565<2.74 <2.84 34 469 Sec-Butylbenzene 0.0011 J <0.00098 <0.0011 0.0046 J <0.00096 <0.00087 21<0.00092 <0.00092 3.3 626 Tert-Butylbenzene <0.0011 <0.00098 <0.0011 0.0014 J <0.00096 <0.000874.8<0.00092 <0.000923.4 626 Ethylbenzene <0.0012 <0.0011 0.0170 J <0.001 <0.0011<0.000950.740 J <0.001 <0.001 4.6 1560 Fluorene <0.016 <0.015 .0429 <0.015 <0.016 <0.015 0.106 J <0.015 <0.015 44 620 Isopropylbenzene <0.00089 <0.00078 <0.00089 <0.00075 <0.00077 <0.000694.6<0.00074 <0.000741.7 1564 p-Isopropyltoluene <0.0016 <0.0014 <0.0016 <0.0013 <0.0014 <0.0012 28 <0.0013 <0.0013 NL NL 2-Methylnapthalene <0.016 <0.014 <0.016 <0.014 <0.015 <0.014 0.440 J <.014 <.014 1.7 63 Napthalene <0.0013 <0.0012 <0.0013 <0.0011 <0.0012 <0.001020.4<0.0011 <0.0011 0.58 313 Phenanthrene <0.017 <0.016 <0.018 <0.016 <0.017 <0.016 0.143 J <0.016 <0.016 60 469 n-Propylbenzene <0.0011 <0.0049 <0.0011 <0.00094 <0.00096 <0.0008710<0.00092 <0.000921.7 626 1,2,4-Trimethylbenzene <0.0016 <0.00098 <0.0016 <0.0013 <0.0014 <0.0012120<0.0013 <0.0013 7.5 782 1,3,5-Trimethylbenzene <0.0017 <0.0015 <0.0017 <0.0014 <0.0014 <0.001395<0.0014 <0.0014 7.3 782 Xylenes (total) <0.0032 <0.0028 <0.0032 <0.0027 <0.0028 <0.0025 4.27 <0.0046 <0.0046 5 3129 Notes: Prepared/Date: _______1. All results shown in mg/kg (milligrams per kilogram) Checked/Date: _______ 2. MSCC = Maximum Soil Contaminant Concentration 3. J = Estimated result < PQL and • MDL 4. --- Not tested 5. ## = considered immobile 6. NL = Not listed
Underground Storage Tank Closure Report February 5, 2007 Former Gathings Motor Company, Charlotte, North Carolina MACTEC Project No. 6228-06-3932 Table 3: Tank 3 Confirmation Soil Analytical Results CompoundT-3 Bottom T-3 North T-3 South T-3 East T-3 West Soil to Water MSCCResidentialMSCCDepth in feet > 15 8 8 8 8 -- Sec-butylbenzene <0.0012 0.0016 <0.062 <0.001 0.250 3.3 626 Chlorobenzene <0.0017 0.0045 <0.094 <0.0015 <0.084 0.44 312 1,2-Dichlorobenzene <0.0011 0.150 2.600 0.0019 <0.052 0.28 1400 1,3-Dichlorobenzene <0.0015 0.024 0.460 <0.0013 <0.073 6.5 1400 1,4-Dichlorobenzene <0.0017 0.078 1.7000.0031 <0.084 0.023 27 Ethylbenzene <0.0013 0.012 <0.069 <0.0011 0.510 4.6 1,560 Isopropylbenzene <0.00092 0.0028 <0.050 <0.0008 0.210 1.7 1,564 MTBE 0.003 <0.00042 <0.025 <0.0004 <0.022 0.92 213 Naphthalene 0.0032 0.026 1.800<0.0012 5.7000.58 313 n-propylbenzene <0.0012 0.0072 <0.062 <0.001 0.490 1.7 626 Toluene <0.0016 0.0092 <0.087 <0.0014 <0.078 7.3 3200 1,2,4-Trimethylbenzene 0.0024 0.072 0.390 <0.0014 5.500 7.5 782 1,3,5-Trimethylbenzene <0.0017 0.024 <0.094 <0.0015 1.200 7.3 782 Total Xylenes <0.0033 0.099 <0.180 <0.0029 1.700 5.0 3129 Acenaphthylene <0.018 <0.017 0.082 <0.017 0.240 11 469 Benzo(a)pyrene <0.033 0.056 <0.032 <0.031 <0.310 0.091 0.088 Benzo(b)fluoranthene <0.031 0.070 <0.030 <0.029 <0.290 1.2 0.88 Benzo(g,h,i)perylene <0.031 0.061 <0.030 <0.029 <0.290 6700 469 Benzo(k)fluoranthene <0.038 0.038 <0.036 <0.035 <0.350 12 9 Chrysene <0.014 0.062 <0.014 <0.013 <0.130 38 88 Fluoranthene <0.014 0.085 0.087 0.033 <0.130 280 620 Fluorene <0.018 <0.016 0.098 <0.016 0.220 44 620 2-Methylnaphthalene <0.016 0.037 3.7000.020 10.001.7 63 Phenanthrene <0.018 0.053 0.270 <0.017 0.550 60 469 Pyrene <0.020 0.098 0.240 0.060 0.360 290 469 Total Chromium 17 45 28 67 19 27 47 Total Lead 7.4 33 9.8 20 11 270 400 C5-C8 Aliphatics <2.16 <2.14 2.24 <1.91 <2.5 72 939 C9-C18 Aliphatics 2.30 2.40 62.7 4.52 78.98 3,300 9,386 C19-C36 Aliphatics <4.37 151 755 255 789 --- 93,860 C9-C22 Aromatics <6.99 <7.23 117.5 56.6 255 34 469 Notes: Prepared/Date: _______1. All results shown in mg/kg (milligrams per kilogram) Checked/Date: _______ 2. MSCC = Maximum Soil Contaminant Concentration
Underground Storage Tank Closure Report February 5, 2007
Former Gathings Motor Company, Charlotte, North Carolina
MACTEC Project No. 6228-06-3932
IV. Conclusions and Recommendations
Tank 1
The results of the confirmation analyses indicated that petroleum-
affected soil (C9-C22 Aromatics) with hydrocarbon concentrations
exceeding the Residential and Soil-to-Water MSCCs remains beneath
the building foundation (represented by sample BD-3). There are two
alternatives for further assessment and/or remediation at Tank 1.
If the property is not planned for residential re-development, then
MACTEC recommends that a Limited Site Assessment consisting of
groundwater sampling be performed to provide potential closure of the
incident.
If the re-development of the property could possibly include a
residential land use, then MACTEC recommends that the remaining
soil at location BD-3 be excavated and disposed following removal of the
site building. Minimal confirmation sampling and analysis should be
performed to verify that no affected soil with hydrocarbon
concentrations exceeding the residential MSCCs remains.
Tank 2
The results of the closure analyses did not identify concentrations of
diesel or gasoline range petroleum hydrocarbons in soil that exceeded
the North Carolina Department of Environment and Natural Resources
(NCDENR) established action level of 10 ppm. Based on the results of
the laboratory analyses, and our field observations, MACTEC
recommends no further action relative to Tank 2.
Tank 3
The results of the confirmation analyses indicates that petroleum-
affected soil with hydrocarbon concentrations exceeding the Soil-to-
Water MSCCs remains near the 1222 South Tryon building foundation`
and near the adjoining property boundary to the southwest
(represented by samples T-3 West and T-3 South, respectively).
MACTEC recommends that a Limited Site Assessment consisting of soil
and groundwater sampling be performed at the former Tank 3 location
to provide closure of the incident.