26036_Uzzle Cadillac_2012 Groundwater Monitoring Report

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GROUNDWATER MONITORING AND SAMPLING REPORT
Uzzle Cadillac-Oldsmobile-GMC Truck
3737 Chapel Hill Boulevard
Durham, North Carolina
NCDENR Incident No: 22714
Prepared for:
Uzzle Cadillac-Oldsmobile-GMC Truck
4525 Woodhaven N.E.,
Marietta, Georgia 30067
Prepared by:
ECS Carolinas, LLP
9001 Glenwood Avenue
Raleigh, North Carolina 27617
August 15, 2012
Prepared By:
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James M. Stahling, L.G.
Senior Environmental
Geologist
Reviewed By:
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Aric V. Geda, P.E.
Vice President

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GROUNDWATER REMEDIATION AND SAMPLING REPORT �� �1 �'`'
UZZLE CADILLAC-OLDSMOBILE-GMS TRUCK o?
3737 CHAPEL HILL BOULEVARD
DURHAM. NORTH CAROLINA
A SITE INFORMATION
1. Site Identification
Date of Report:
August 15, 2012
Facility I.D.:
Not Applicable: 0-015266 Incident No.: 22714
Site Risk:
Intermediate
Site 130D
Rank:
Land Use Industriatl
Classiflcation: Commercial
Site Name
(NCDENR Incident Name):
Uzzle Cadillac-Oldsmobile-GMC Truck
Site Street Address:
3737 Chapel Hill Road
CitylTown:
I Zip Code: 27707 1 County: Durham
Description of Geographical Data Point: Approximate Center of Property
Location Method:
Google Maps
Latitude (decimal degrees):
35.969944
Longitude (decimal degrees): 78.953306
2. Contact Information
UST OwnerlOperator:
Address:
4525 Woodhaven N.E., Marietta, Tel: [phone]
Georgia 30067
Property Owner:
Address:
Uzzle Cadillac-Oldsmobile-GMC Truck, Inc.
Same as above Tel: Same as above
Consultant/Contractor:
Address:
ECS Carolinas, LLP
9001 Glenwood Avenue Tel: [phone]
Raleigh, NC 27617-7505
Analytical Laboratory:
Address:
Environmental Conservation Laboratories (ENCO)
102-A Woodwinds Industrial Ct. Tel: [phone]
Cary, NC 27511
3. Information about Release
Date Discovered:
1991, 1992
Estimated Quantity of Release: Unknown
Cause of Release:
Unknown
Source of Release (DlspenserlPiping/UST): Unknown
Size and Contents of USTIAST System(s) 2,000 gallon gasofineldiesel fuel UST system (UST-2), and 550
from which the release occurred: gallon virgin oil UST (UST-4), in -ground hydraulic lifts
Criteria Used to Classify Risk
Surface water within 500 feet of LIST source area with
compound concentrations that exceed surface water quality
standards contained in 15A NCAC 215 .0200 and US EPA
National Criteria for Class WSW-V Waters by a factor of 10
4. Certification
I, James M. Stahling, a Uc%R9AV4[+Geologist for ECS Carolinas, LLP do certify that the information
contained in this report is,goj ct•rrate to the best of my knowledge.
,
ECS Carolinas, LLP iAG'B " a &gineering in North Carolina. The certification number of the
corporation is F-1078�
10 Ai.
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Groundwater Monitoring and Sampling Report
Uzzle Cadillac-Oldsmobile-GMC Truck
3737 Chapel Hill Boulevard, Durham, NC
B EXECUTIVE SUMMARY
The following Groundwater Sampling report has been prepared by ECS Carolinas, LLP (ECS) for
the former Uzzle Cadillac-Oldsmobile-GMC Truck facility located at 3737 Chapel Hill Boulevard in
Durham, North Carolina. The Location of the facility is shown on Figures 1 and 2. A generalized
site plan is included as Figure 3.
This report has been prepared to address groundwater sampling for a release of petroleum
hydrocarbon compounds from underground storage tank (UST) systems and in -ground hydraulic
vehicle lifts.
B.1 Maximum free product thickness
No free product was measured in site monitoring wells during the monitoring event. Free product
was measured in an offsite monitoring well, MW-17, with a thickness of 2.96 feet. The free product
appears to be waste motor oil.
6.2 Maximum concentration of groundwater contaminants with comparison to
cleanup goals
Groundwater from the site is oriented and may discharge to a buried stormwater pipe that appears
to be installed in a former stream channel. The site is ranked Intermediate Risk as petroleum
compounds are present in the groundwater with concentrations that exceed a multiplier of 10 times
the surface water quality standards (10 X SWQS) contained in 15A NCAC 2B.0200, Classifications
and Water Quality Standards Applicable to the Surface Waters of North Carolina and the US EPA
National Criteria. To achieve a Low Risk classification, the concentrations must be lower than the
10 X SWQS and impacted groundwater from the site cannot discharge to the stormwater line with
concentrations that exceed the 213-National Criteria standards.
Groundwater sampling performed in July 2012 revealed the following concentrations that exceeded
the 2B-National Criteria standards.
• Benzene: 2,000 micrograms per liter (ug1L) in MW-8. The SWQS is 1.19 ug1L.
Ethyl benzene: 1,600 uglL in MW-10. The SWQS is 97 uglL.
• Xylenes: 3,500 ug/L in MW-9. The SWQS is 670 ug/L.
• Methyl tertiary -butyl ether (MTSE): 20 ug1L in MW-10. The SWQS is 19 uglL.
1,2,4-Trimethyl benzene: 1,800 uglL in MW-9. The SWQS is 390 uglL.
C5-C8 aliphatics: 8,700 uglL in MW-8. The SWQS is 830 ug/L.
• C9-C10 aromatics: 8,700 uglL in MW-8. The SWQS is 830 ug1L.
B.3 Current extent of free product and dissolved groundwater contamination
with comparison to historical extents.
A plume of petroleum compounds that originated from a former diesel fuel -gasoline UST location
does not appear to have continued to migrate downgradient as evidenced from current and
historical laboratory analytical data. The plume has historically consisted of compounds that
exceed the 10 X 2B standards which include benzene, toluene ethylbenzene and xylenes (total).
Levels of dissolved phase petroleum compounds in the plume have decreased since it was
originally assessed in the early 2000's.
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Groundwater Monitoring and Sampling Report
Uzzle Cadillac-Oldsmobile-GMC Truck
3737 Chapel Hill Boulevard, Durham, NC
13.4 Maximum concentrations of contaminants in soil in the unsaturated zone in
comparison to cleanup goals
Soil with contaminant concentrations above the Soil to Groundwater Maximum Soil Contaminant
Concentrations (MSCC) and Residential MSCC regulatory levels are present at the site.
13.5 Effectiveness of remedial action plan
Two Corrective Action Plans (GAPS) were prepared for the site in the early 2000's as the site
formerly had two NCDENR release incidents. One CAP was prepared for the Division of Water
Quality (DWQ) to address the release of impacted soils that resulted from the release of hydraulic
fluid from in -ground hydraulic lifts that were serviced by aboveground storage tanks (ASTs).
Remediation through natural attenuation through an approved CAP has been conducted for the
release. The second CAP was prepared for the UST Section to address a release of diesel fuel -
gasoline and virgin oil from two underground storage tanks. The CAP recommended soil
remediation through excavation and offsite treatment and disposal and groundwater remediation
through the conductance of mobile multi -phase extraction (MMPE). Proposed remediation was
suspended on October 27, 2004 due to Session Law 2003-352 that suspended the requirement of
groundwater remediation at Low and Intermediate risk sites. In May 2012, the UST Section
lowered their risk and rank classification that resulted in the requirement for further environmental
work to be conducted at the site,
B.fi Potential impact to receptors
' Impacted groundwater from the diesel fuel -gasoline and virgin oil USTs, and in -ground lifts is
oriented toward the stormwater line. No other potential receptors (including water supply wells)
have been identified downgradient of the site. Current and historical groundwater laboratory
' analytical data has not shown the plume to have impacted the stormwater line above 213-National
Criteria SWQS.
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C TABLE OF CONTENTS
SITE INFORMATION............................................................................................1
EXECUTIVE SUMMARY......................................................................................2
B.1
MAXIMUM FREE PRODUCT THICKNESS............................................................2
B.2
MAXIMUM CONCENTRATION OF GROUNDWATER CONTAMINANTS WITH
COMPARISON TO CLEANUP GOALS..................................................................2
B.3
CURRENT EXTENT OF FREE PRODUCT AND DISSOLVED GROUNDWATER
CONTAMINATION WITH COMPARISON TO HISTORICAL EXTENTS ..........................2
B.4
MAXIMUM CONCENTRATIONS OF CONTAMINANTS IN SOIL IN THE
UNSATURATED ZONE IN COMPARISON TO CLEANUP GOALS...............................3
B.5
EFFECTIVENESS OF REMEDIAL ACTION PLAN...................................................3
B.6
POTENTIAL IMPACT TO RECEPTORS................................................................3
TABLEOF CONTENTS.......................................................................................4
SITE
HISTORY AND CHARACTERIZATION......................................................7
D.1
UST AND AST OWNER AND OPERATOR INFORMATION....................................7
❑.2
UST SYSTEM INFORMATION..........................................................................7
❑.3
NON -AST SYSTEM INFORMATION..................................................................7
❑.4
SPILL INFORMATION......................................................................................7
D.4.1 UST Releases............................................................................................7
❑.5 DESCRIPTION OF SITE CHARACTERISTICS (SITE AND VICINITY LAND USE,
TOPOGRAPHY, VEGETATION, SURFACE WATER, WELLS, BUILDINGS,
SURFACE COVER, SOIL TYPE, DEPTH TO AND NATURE OF BEDROCK,
DEPTH TO GROUNDWATER DIRECTION OF GROUNDWATER FLOW) ......................8
D.6 OWNERS AND OCCUPANTS OF PROPERTY WITHIN AREA CONTAINING
CONTAMINATION OF WHERE CONTAMINATION IS EXPECTED TO MIGRATE ..........1 O
D.7 RECEPTORS AND POTENTIAL RECEPTORS.....................................................10
D.8 SUMMARY OF REMEDIAL ACTIONS CONDUCTED AT THE SITE ...........................11
D.9 REMEDIAL PROGRESS FROM CAP PREPARATION TO LATEST
MONITORING -SAMPLING ...............................................................................11
CURRENT SITE ASSESSMENT INFORMATION AND COMPARISON
TO HISTORICAL ASSESSMENT INFORMATION............................................12
E.1 CURRENT WATER LEVEL AN❑ FREE PRODUCT THICKNESSES ........................12
E.2 GROUNDWATER MONITORING EVENT............................................................12
E.3 SURFACE WATER MONITORING EVENT..........................................................12
E.4 SOIL MONITORING EVENT.............................................................................12
E.5 SUMMARY OF SOIL, GROUNDWATER, SURFACE WATER AND FREE
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PRODUCT ASSESSMENT INFORMATION ACQUIRED TO DATE..............................12
E.5.1 Groundwater Analytical Results...........................................................12
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E.5.2 Soil Analytical Results. .13
E.6 GEOLOGY AND HYDROGEOLOGY OF THE SITE................................................13
E.6.1 Regional and Site Geology........................................................................13
E.6.2 Hydrogeology............................................................................................14
E.7 SOIL, GROUNDWATER SURFACE WATER AND FREE PRODUCT
ASSESSMENT INFORMATION.........................................................................14
E.7.1 Maximum historical extent of contamination.............................................14
E.7.2 Current extent of contamination................................................................14
E.7.3 Cleanup Standards .14
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F FREE PRODUCT REMOVAL.............................................................................15
G SOIL REMEDIATION.........................................................................................15
H GROUNDWATER REMEDIATION.....................................................................15
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CONCLUSIONS.................................................................................................15
1 TABLES
Table B-1
Site History -UST System and Other Release Information
Table B-2
Site History -UST Owner/Operator and Other Responsible Party
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Information
Table B-3A
EPA Method 8260 Soil Analytical Results
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Table B-3B
Summary of Semi -Volatile Soil Analytical Results
Table B-3C
Summary of MADEP VPH and EPH Soil Analytical Results
Table B-4A
Summary of Volatile Groundwater Analytical Results
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Table 13-413
Summary of Semi -Volatile Laboratory Analytical Results
Table B-4C
Summary of MADEDP VPH and EPH Groundwater Analytical Results
Table B-4D
Summary of Groundwater Lead and Chromium Analytical Results
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Table 4E
Groundwater Sampling Analysis
Table B-5
Receptor Information
Table B-6
Property Owners/Occupants
Table B-7
Monitoring and Remediation Well Construction Information
Table B-8A
Free Product Recovery Information
Table B-8B
Cumulative Volume of Free Product Recovered From Site
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Table B-9
Current Historical Groundwater Elevations and Free Product Thickness
Table B-10
Land Use
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FIGURES
Figure 1
Site Vicinity Map
Figure 2
Figure 3
Land Use Map
Site Plan
Figure 4
Groundwater Surface on July 19-20, 2012
Figure 5
Benzene Isoconcentration Map, July 19-20, 2012
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Figure 6 Ethylbenzene Isoconcentration Map, July 19-20, 2012
LIST OF APPENDICES
APPENDIX A Prior Assessment and Remediation Information
APPENDIX B Laboratory Analytical Report Forms and Chain -of Custody
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