HomeMy WebLinkAbout21011_South Blvd Carvana_GW Assmt Rpt_20161209
Groundwater Assessment
ECS Carolinas, LLP
1200 Woodruff Road
Greenville, South Carolina 29607
(864) 987‐1610
Report of
Carvana
Charlotte, Mecklenburg County, North Carolina
Prepared for
Carvana, LLC
December 9, 2016
December 9, 2016
Ms. Vanessa MacDonald
Carvana, LLC
4020 East Indian School Road
Phoenix, Arizona 85018
Reference: Report of Groundwater Assessment
Carvana
3631 South Boulevard
Charlotte, Mecklenburg County, North Carolina
ECS Project 49‐2994‐C
Dear Ms. MacDonald:
ECS Carolinas, LLP (ECS) is pleased to provide Carvana, LLC (Carvana) with the results of our groundwater
assessment for the above‐referenced site. ECS’s services were provided in accordance with ECS
proposal No. 49‐2996P authorized on October 25, 2016. ECS appreciates the opportunity to provide our
services to you. If there are questions regarding this report, or a need for further information, please
contact us.
Respectfully submitted,
ECS CAROLINAS, LLP
Britney Barnes
Senior Environmental Project Manager
BCBarnes@ecslimited.com
864‐987‐1811
C. Brian Smith, P. G.
Principal Geologist
bsmith@ecslimited.com
615‐885‐4845
Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
1
TABLE OF CONTENTS
1.0 PROJECT INFORMATION .................................................................................................................... 1
2.0 SCOPE OF SERVICES ............................................................................................................................ 1
3.0 RESULTS .............................................................................................................................................. 2
4.0 CONCLUSIONS .................................................................................................................................... 3
5.0 RECOMMENDATIONS ......................................................................................................................... 3
6.0 QUALIFICATIONS OF REPORT ............................................................................................................. 3
FIGURES
Figure 1 Site Topographic Map
Figure 2 Sample Location Map
TABLES
Table 1 Summary of Groundwater Analytical Results
APPENDIX
Appendix A Site Photograph Log
Appendix B Laboratory Analytical Data
Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
1
1.0 PROJECT INFORMATION
The subject site is located at 3631 South Boulevard in Charlotte, Mecklenburg County, North Carolina
(Figure 1). The site is approximately 1.96 acres of vacant land. ECS completed a Phase I Environmental
Site Assessment (ECS Project No. 49‐2994 dated September 28, 2016) that identified the following
recognized environmental conditions (RECs) in connection with the property:
The property located at 3801 South Boulevard (230 feet southwest and topographically
upgradient) operated as a gasoline station and an auto repair facility since the 1950s. According
to the environmental regulatory database report, this facility formerly operated four 4,000‐
gallon gasoline underground storage tanks (USTs), three 5,000‐gallon waste oil USTs, and one
1,000‐gallon kerosene UST. Contamination was identified in April 2007 and it was noted that
soil was to be removed prior to obtaining a Notice of Residual Petroleum for this property.
According to the regulatory database report, the incident has not been closed by the North
Carolina Department of Environmental Quality (NCDEQ). Based on the proximity to the property
and the groundwater flow direction inferred from the surface topography, ECS considered this
facility to be a REC of the subject property.
In an effort to determine if the site has been adversely impacted by the release identified at the gasoline
station/auto repair facility to the southwest of the site, ECS was contracted to conduct a groundwater
assessment.
2.0 SCOPE OF SERVICES
The environmental assessment consisted of collecting two groundwater samples. Drilling activities were
conducted using a Geoprobe® drill rig. The subcontractor used for this project was Carolina Soil
Investigations (CSI). Drilling and sampling activities were conducted on November 17, 2016. A
photographic log documenting the field sampling activities is provided in Appendix A.
2.1 Public and Private Utility Locate
Prior to commencing with field activities, ECS contacted North Carolina One‐Call to locate/mark public
utilities at the site. Required separation distances between subsurface activities and marked utilities
(typically 30‐inches) were maintained during the field activities.
2.2 Groundwater Sampling Activities
On November 17, 2016, two borings were advanced along the southwestern portion of the site, TW‐1
and TW‐2, to assess the off‐site REC identified in the Phase I ESA. The sample locations are shown on
Figure 2.
The borings were advanced by hydraulically driving a five‐foot long, 1.5‐inch diameter soil sampling
probe into the soil. Prior to advancing each boring, the down hole equipment and Geoprobe® drill rig
were decontaminated utilizing a high pressure steam cleaner and municipal water. The down hole
equipment and drill rig were decontaminated to prevent cross‐contamination between boring locations.
Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
2
Continuous soil samples were collected at location TW‐1 to determine the depth to groundwater. The
soil samples were collected using a soil sampling probe lined with a disposable clear plastic tube. The
clear plastic tube was replaced with each five‐foot interval. After the soil sampling probe was driven,
the clear plastic tube filled with soil was removed from the probe and cut open to expose the soil for
visual characterization and observation for the occurrence of groundwater. Groundwater was observed
at a depth of approximately 20 feet below the ground surface (ft bgs) at location TW‐1.
Two temporary monitoring wells were installed (TW‐1 and TW‐2). The temporary wells were constructed
with one‐inch inside diameter Schedule 40 PVC flush‐threaded casing and screen. A ten‐foot length of
slotted well screen with machined 0.010‐inch slot widths and a threaded bottom plug was installed at the
bottom of each well. Drilling refusal was encountered at a depth of 24 feet below the ground surface (ft
bgs) at location TW‐1 and 19 ft bgs at location TW‐2. As such, the well screens were installed at the bottom
of each boring. A solid section of PVC casing was placed above the screened interval and extended to just
above the ground surface. The annular space around each well screen was filled with washed and graded
medium sand to approximately two feet above the top of the screen.
Following the completion of the groundwater sampling activities, the temporary monitoring wells were
removed and the borings were properly abandoned.
2.3 Groundwater Sample Collection
The groundwater samples were collected using peristaltic pump with dedicated Teflon lined tubing each
of the sampling locations. A minimum of three well volumes were purged prior to the collection of the
groundwater samples. Following purging of the wells, groundwater samples were collected in
laboratory‐prepared containers while the sampler was wearing a new pair of disposable nitrile gloves at
each of the sampling locations.
The groundwater sample containers were labeled with ECS project number, sample identification,
sample date and time, and requested analytical analysis. The containers were placed into protective
packaging material and placed into a cooler with ice to maintain the samples at approximately 4 Celsius
(C). The samples were submitted to Prism Laboratories located in Charlotte, North Carolina (North
Carolina Certification # 402) for chemical analysis for volatile organic compounds (VOCs) and semi‐
volatile organic compounds (SVOCs) using EPA Methods 8260 and 8270, respectively. ECS maintained
proper chain‐of‐custody (COC) procedures throughout the sample collection and transportation process.
Copies of the COCs are included in Appendix B.
3.0 RESULTS
3.1 Groundwater Sample Results
Laboratory analysis of the groundwater samples detected two petroleum related VOCs in the samples
collected from TW‐1 and five petroleum related and chlorinated VOCs in the sample collected from TW‐
2 at concentrations above the laboratory reporting limits. Two VOCs, 1,2‐dichloroethane (1,2‐DCA) and
methyl‐tert‐butyl‐ether (MTBE), were detected at concentrations above the respective North Carolina
2L Groundwater Quality Standards (NC2LGWQS). These two VOCS were detected in samples collected
from both TW‐1 and TW‐2. The detected concentrations of 1,2‐DCA and MTBE do not exceed the North
Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
3
Carolina Gross Contamination Level (GCL), nor do they exceed the Division of Waste Management Vapor
Intrusion Screening Level for groundwater for a residential and non‐residential scenario.
Laboratory analysis did not detected SVOCs in either of the groundwater samples at concentrations
above the laboratory reporting limits.
A summary of the laboratory analytical results for groundwater is provided on Table 1. The laboratory
data sheets are included in Appendix B.
4.0 CONCLUSIONS
Based on the results of the environmental assessment, ECS concludes the following:
Two VOC were detected in the groundwater sample collected from TW‐1 and five VOCs were
detected in the groundwater sample collected from TW‐2. Of the VOCs detected, two were
detected at concentrations that exceeded the NC2LGWQS (1,2‐DCA and MTBE); however the
detected concentrations did not exceed the GCL or the residential and non‐residential vapor
intrusion screening levels for groundwater.
Based on the VOCs detected in the groundwater samples, it appears the site has been impacted
by the operations of the southwestern gasoline/auto repair operations; however, the impacts to
the groundwater are not anticipated to impact proposed site development activities.
5.0 RECOMMENDATIONS
Based on the results of the environmental assessment, ECS recommends the following:
ECS does not recommend additional assessment at this time.
ECS recommends providing a copy of this report to the current property owner of the site.
6.0 QUALIFICATIONS OF REPORT
The activities and evaluative approaches used in this assessment are consistent with those normally
employed in environmental assessment projects of this type. Our evaluation of site conditions has been
based on our understanding of the site project information and the data obtained during our field
activities. This report was prepared for the express use Carvana, LLC. Use of this report by other
individuals or companies implies their acceptance of the General Conditions of Service of the original
contract.
Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
4
FIGURES
FIGURE 1
SITE TOPOGRAPHIC MAP
Carvana
3631 South Boulevard
Charlotte, Mecklenburg County, North Carolina
ECS Project Number 49‐2994‐C
SOURCE:
USGS Topographic Map
Charlotte West and Charlotte East Quadrangles
2016
SCALE:
1‐inch = 2,000 feet
1’2000’1000’
SITE
FIGURE 2
SAMPLE LOCATION MAP
Carvana
3631 South Boulevard
Charlotte, Mecklenburg County, North Carolina
ECS Project Number 49‐2994‐C
SOURCE:
GOOGLE EARTH, DATED 2016
SCALE:
1‐inch = ~ 120 feet
APPROXIMATE GROUNDWATER
SAMPLE LOCATION
APPROXIMATE SITE BOUNDARY
LEGEND
SITE
1’120’60’
TW‐1
TW‐2
Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
5
TABLES
Pa
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B
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5
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60
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6
,
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4
,
5
2
0
,
0
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1
9
,
0
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Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
6
APPENDIX A
SITE PHOTOGRAPHS
PHOTOGRAPHIC LOG
Carvana
3631 South Boulevard
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49:2994‐C
Photograph 1: View of the site facing west
Photograph 2: View of the temporary monitoring well, TW‐1
PHOTOGRAPHIC LOG
Carvana
3631 South Boulevard
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49:2994‐C
Photograph 3: View of the installation of temporary well TW‐2
Photograph 4: View of where the groundwater was encountered at TW‐1 location
Report of Groundwater Assessment
Charlotte, Mecklenburg County, North Carolina
ECS Project No. 49‐2994‐C
December 9, 2016
7
APPENDIX B
LABORATORY ANALYTICAL DATA
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