HomeMy WebLinkAbout19040_ATANDO_AVE_PRII 20130603
FROEHLING & ROBERTSON, INC.
Engineering Stability Since 1881
2505 Hutchison-McDonald Road
Charlotte, North Carolina 28269
T 704.596.2889 I F 704.596.3784
NC License #F-0266
Corporate HQ: 3015 Dumbarton Road Richmond, Virginia 23228 T 804.264.2701 F 804.264.1202 www.fandr.com
VIRGINIA • NORTH CAROLINA • SOUTH CAROLINA • MARYLAND • DISTRICT OF COLUMBIA
A Minority-Owned Business
June 5, 2013
SunTrust Bank
2323 Operations Drive
Durham, North Carolina 27705
Subject: Limited Phase II ESA Services
13-001382-01-1 Atando Avenue
527 Atando Avenue
Charlotte, North Carolina
F&R Project No. 63R-0048
At your request, Froehling & Robertson, Inc. (F&R) has completed a Limited Phase II Environmental
Site Assessment (ESA) at the above referenced property, herein referred to as the Property. The
purpose of this project was to determine whether contamination exists at selected locations in the
groundwater from Recognized Environmental Conditions (RECs) identified during a Phase I
Environmental Site Assessment completed for the Property by F&R in May 2013.
BACKGROUND INFORMATION
The subject property is an approximately 4-acre parcel improved upon with an
office/warehouse structure on Atando Avenue, in Charlotte, North Carolina. F&R just
completed a Phase I Environmental Site Assessment and discovered the following Recognized
Environmental Condition:
The following on-site RECs were identified:
• According to files reviewed at the Department of Environment and Natural Resources
(DENR), two 6,000-gallon heating oil USTs were located under the concrete slab of the
southern warehouse on site. The tank contents were evacuated in March 2003 and five
monitoring wells (MW-1 through MW-5), one deep well (DW-1) and 14 soil borings
along the lines and USTs were installed. MW-1 originally showed 0.05 feet of free
product. Soil contamination as high as 15,000 ppm TPH- diesel range organics (DRO) by
UST-1 and 12,000 ppm TPH-DRO by UST-2 indicated a release from both USTs.
Contamination above the North Carolina 2L Groundwater Quality Standards (2L) were
found in MW-2, MW-3 and MW-5 along with the free product in MW-1. MW-5 was
located on the northwestern exterior of the building and shallow groundwater flow was
mapped in a southern direction, so contamination in this well may have been from an
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 2 June 5, 2013
offsite source or from the previous heating oil USTs mentioned above. During a UST
closure for UST-1 in May 2004, 416 tons of soil were removed down to 17 feet below
ground surface (bgs), however free product was still recovered in MW-1 as of the
December 2004 sampling event. No additional sampling or information regarding the
incident was found and contamination as well as possible free product remain with no
regulatory closure.
• Incidents involving chemicals of concern (COC) were identified in the EDR Environmental
Database Report within the critical distance (100 feet up to cross gradient from the
nearest property line) of the Property. The two on-site incidents, specifically
contamination from the heating oil USTs below the concrete slab in the southern
warehouse, may have an effect on the breathing space within the warehouse as well as
the office area.
GROUNDWATER SAMPLING AND RESULTS
In an effort to determine whether contamination is present in the shallow groundwater beneath
the Property, F&R attempted to sample the five (5) monitoring wells that are currently present on
site. These monitoring wells were installed in 2003 during on-site investigations. MW-1 was
located in the area of the former UST-1, MW-2 near the closed in place UST-2, MW-3 on the
southern exterior of the building, MW-4 on the western exterior of the building, and MW-5 on the
northern exterior of the building. Please refer to the Sample Location Map attached to the report.
During sampling activities, F&R was unable to access MW-1 since concrete had been placed over
the access point. MW-3 was also not sampled because the well was found to be dry. The
remainder of the wells (MW-2, MW-4 and MW-5) were sampled and analyzed for volatile organic
compounds (VOCs) and semivolatile organic compounds (SVOCs) via EPA methods 8260B and
8270C, respectively.
Groundwater samples collected from MW-2 and MW-5 exhibited concentrations of VOCs and
SVOCs above the 2L Standard. Concentrations of chlorinated solvents were found above the Gross
Contaminant Levels (GCLs). The following Table 1 presents the groundwater analytical results.
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 3 June 5, 2013
Table 1. Groundwater Analytical Results
Sample ID MW-2 (ug/L) MW-4 (ug/L) MW-5 (ug/L) NC 2L GWQS (ug/L) GCL (ug/L)
8260s
cis-1,2-dichloroethylene ND ND 1100 70 70000
tetrachloroethylene ND ND 4900 0.7 700
trans-1,2-
dichloroethylene ND ND 12 100 100000
trichloroethylene ND ND 3000 3 3000
vinyl chloride ND ND 120 0.03 30
napthalene 46 (2013) 0.56 (2013) ND (2013) 6 6000 92 (2003) ND (2003) ND (2003)
sec-butylbenzene 5.8 3.7 ND 70 8500
tert-butylbenzene 3.6 3 ND 70 15000
1,2,4-trimethylbenzene 31 ND ND 400 28500
1,3,5-trimethylbenzene 7.9 ND ND 400 25000
4-isopropyltoluene 0.97 ND ND 25 11700
benzene 57 (2013) ND (2013) ND (2013) 1 5000 55 (2003) ND (2003) 3.6 (2003)
ethylbenzene 16 (2013) ND (2013) ND (2013) 600 84500 15 (2003) ND (2003) ND (2003)
isopropylbenzene 21 ND ND 70 25000
total xylenes 10.6 (2013) ND (2013) ND (2013) 500 85500 98 (2003) ND (2003) ND (2003)
n-butylbenzene 1.6 ND ND 70 6900
n-propylbenzene 12 ND ND 70 30000
8270s
1-methylnapthalene 39 ND ND 1 1000
2-methylnapthalene 16 ND ND 30 12500
fluorene 7.7 (2013) ND (2013) ND (2013) 300 990 18 (2003) ND (2003) ND (2003)
napthalene 41 ND ND 6 6000
NC 2L GWQS = the North Carolina 2L.0202 groundwater quality standards dated 4/16/2012
GCL = Gross Contaminant Levels
Bold = Exceeds 2L GWQS
Bold = Exceeds GCL
Italic = Exceeded 2L during 2003 sampling event
ND = non-detect
(2013) = Sampling event date
Napthalene (46 ug/L), benzene (57 ug/L) and 1-methylnapthalene (39 ug/L) were found above the
2L Standard in MW-2 but were below the GCLs. However, when compared to the data from 2003,
it is notable that the concentration of benzene in MW-2 has not decreased over a period of 10
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 4 June 5, 2013
years. This indicates that there is continued contamination in the area of the former heating oil
USTs. The detected analytes are consistent with a former petroleum release. Also, free product
was found in MW-1 in 2003 but we were unable to sample this well since concrete had been
placed over the cap. Since subsequent sampling was not conducted in this area and the most
recent data indicates that free product was still present in the well as of 2004, there is a possibility
that it still remains and could be the reason for the continued benzene contamination in the
downgradient MW-2.
Tetrachloroethylene (PCE), trichloroethylene (TCE), cis-1,2-dichloroethylene and vinyl chloride
were all found at concentrations above the 2L in MW-5 on the northern exterior of the building.
More notably, PCE, TCE and vinyl chloride were found at concentrations above the GCLs. PCE was
found at 4,900 ug/L and vinyl chloride at 120 ug/L in the shallow groundwater at MW-5 which is
an order of magnitude over the GCLs.
GCLs are used by DENR to determine risk from a petroleum or solvent release. In general terms,
exceedances of the GCL typically require active remediation, not just additional assessment.
There are currently two shallow groundwater plumes identified on the Property. One is the
previously documented petroleum plume that is above the 2L Standards but below the GCLs. It is
likely that this contamination will require additional monitoring if the data is reported to DENR.
The other shallow groundwater plume is for the chlorinated solvents PCE, TCE and vinyl chloride.
These solvents are typically associated with dry-cleaning or other industrial solvent use. The
chlorinated solvents are regulated under a different section at DENR and will require additional
assessment and probably remediation. These analytes were not tested in the 2003 assessment, so
it is unknown how long that area of the Property has been impacted.
CONCLUSIONS and RECCOMENDATIONS
• Dissolved petroleum-based contamination was found in shallow groundwater at MW-2
at similar levels compared to samples taken in 2003. This indicates that contamination
still exists on the Property from the heating oil USTs and contamination exists above
DENR action levels. F&R recommends additional soil and groundwater testing in the
area of the USTs.
• Analysis of the groundwater at MW-5 indicated concentrations of chlorinated solvents
above the GCLs in shallow groundwater. It is unknown whether this contamination has
resulted from activities on the Property in the past or from an off-site source. Since
contamination exists above action levels. F&R recommends further delineation of the
solvent plume.
• Since contamination above the 2L Standards as well as GCLs exists within and
immediately outside the building, vapor encroachment could be an issue within the
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 5 June 5, 2013
office area of the building. F&R recommends vapor encroachment screening in the
office area of the building.
F&R appreciates the opportunity to provide you with these environmental consulting services.
Should you have any questions regarding this report or require additional services, please feel
free to contact us at your convenience.
Respectfully,
FROEHLING & ROBERTSON, INC.
Katherine Tornabene Michael W. Minett, REM
Environmental Scientist Environmental Group Manager
Attachments: Limitations, Sample Location Map, Site Photographs, Laboratory Analysis
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 6 June 5, 2013
Limitations
This report has been prepared for exclusive use by SunTrust Bank (the client). These services
have been performed in accordance with generally accepted environmental practices. As with
any subsurface investigation, actual conditions exist only at the precise locations from which
the samples were taken. Certain inferences are based on the results of sampling to form a
professional opinion of conditions in areas beyond those from which the samples were taken.
No other warranty, expressed or implied, is made. Our conclusions and recommendations are
based on information provided to us by others and our Site observations. Our observations are
based on conditions readily observed at the time of our investigation. The contents of the
report should not be construed in any way as a recommendation to purchase, sell, or develop
the project Site.
F&R by virtue of providing the services described in this report, does not assume the
responsibility of the person(s) in charge of the Site, or otherwise take responsibility for
reporting to local, state, or federal public agencies any conditions that may present a potential
danger to public health safety or the environment. We understand that the client will notify
appropriate regulatory agencies of potential impact, risks, or other requirements as necessary.
F&R assumes no responsibility for investigation, remediation, or liability associated with
environmental impact to or from the project property regardless of the date of impact
discovery.
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 7 June 5, 2013
Sample Location Map
Drawn:KET Scale:NTS Project No.:63R-0048
Checked:MWM Date:6/5/2013 Drawing No.:1
UST-2
(closed in place)
Froehling & Robertson, Inc.
Engineering • Environmental • Geotechnical
2505 Hutchison McDonald Rd.
Charlotte, North Carolina 28269 I USA
T 704.596.28891 I F 704.596.3784
Sample Location Map
SAMPLE LOCATION MAP
13-001382-01-1
527 Atando Avenue
Charlotte, North Carolina
MW-4
MW-5
MW-1
(inaccessible)
MW-2
MW-3
(dry)
UST-1
(removed)
Property boundary
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Sunbelt Turret Steel
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 8 June 5, 2013
Site Photographs
ST 13-001382-01-1 Atando Avenue Phase II
Charlotte, North Carolina
June 5, 2013
1. View of MW-1 with concrete over the well in the southern warehouse.
2. View of sampling being conducted at MW-2 in the southern warehouse.
ST 13-001382-01-1 Atando Avenue Phase II
Charlotte, North Carolina
June 5, 2013
3. View of MW-3 on the southern exterior of the building.
4. View of MW-4 on the western exterior of the building.
ST 13-001382-01-1 Atando Avenue Phase II
Charlotte, North Carolina
June 5, 2013
3. View of sampling being conducted at MW-5 on the northern exterior of the building.
SunTrust Bank 13-001382-01-1 Atando Avenue
F&R Project No.: 63R-0048 9 June 5, 2013
Laboratory Analysis
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