19034_IRC_Limited Sub-Slab Investigation_20130917

Limited Sub-Slab
Investigation Report
Former International Resistive Company
736 Greenway Drive
Boone, Watauga County, North Carolina
September 17, 2013
Terracon Project No. 86127103
Prepared for:
International Resistive Company, Inc.
4222 S. Staples Street
Corpus Christi, Texas
Prepared by:
Terracon Consultants, Inc.
3534 Rutherford Road
Taylors, South Carolina
TABLE OF CONTENTS
1.0 INTRODUCTION ............................................................................................................... 1
2.0 SAMPLE COLLECTION ................................................................................................... 1
2.1 Soil Boring Installation ........................................................................................................ 1
2.2 Soil Sample Collection and Field Screening ........................................................................ 2
3.0 LABORATORY ANALYTICAL AND RESULTS ............................................................... 2
3.1 Laboratory Analytical Program ............................................................................................ 2
3.2 Soil Analytical Results ......................................................................................................... 2
4.0 CONCLUSIONS AND RECOMMENDATIONS ................................................................. 3
4.1 Conclusions ........................................................................................................................ 3
4.2 Recommendations .............................................................................................................. 4
5.0 QUALIFICATIONS ............................................................................................................ 4
FIGURES
Figure 1 -Sub-Slab Soil Boring Location Map
Figure 2 -Estimated Extent of Sub-Slab Impact
LIST OF APPENDICES
Appendix A
Appendix B
Appendix C
Table 1
Soil Boring Logs
Laboratory Analytical Report
LIMITED SUB-SLAB INVESTIGATION
FORMER INTERNATIONAL RESISTIVE COMPANY
736 GREENWAY DRIVE
BOONE, WATAUGA COUNTY, NORTH CAROLINA
TERRACON PROJECT NO. 86127103
1.0 INTRODUCTION
Terracon Consultants, Inc. (Terracon) has completed a Limited Sub-Slab Investigation (LSSI) at
the former International Resistive Company (IRC) plant located at 736 Greenway Drive in
Boone, Watauga County, North Carolina. The general layout of the site and sampling locations
are illustrated on Figure 1. Laboratory data results are summarized in Table 1, Appendix A.
Soil boring logs are presented in Appendix B. A copy of the laboratory analytical data report is
provided in Appendix C.
The former IRC plant was demolished to the building slab in June 2013. Future redevelopment
plans for the site include removal of the slab and potential re-grading of the site. The purpose of
the LSSI was to assess sub-slab soils in selected areas of the building for potential impacts
from former facility operations.
Reliance
This report has been prepared for the exclusive use of International Resistive Company, Inc.
Authorization for use or reliance by any other party (except a governmental entity having
jurisdiction over the site) is prohibited without the expressed written authorization of
International Resistive Company, Inc. and Terracon. Any unauthorized distribution or reuse is
at the client's sole risk. Reliance by authorized parties will be subject to the terms, conditions
and limitations stated in the Agreement for Services.
2.0 SAMPLE COLLECTION
2.1 Soil Borings
On July 25, 2013, ten soil borings (labeled "SSS-1" through "SSS-10") were advanced at the
site using a track-mounted GeoProbe® rig operated by SAEDACCO, Inc. of Fort Mill, South
Carolina. Borings SSS-1 through SSS-3 were located adjacent to the former Boiler Room.
Boring SSS-4 was located in the Recovery Room adjacent to a former wastewater sump.
Borings SSS-5 and SSS-6 were located in the old Plating Room adjacent to a trench drain and
sump, respectively. Boring SSS-7 was located in the Sludge Accumulation Area adjacent to a
floor drain. Borings SSS-8 and SSS-10 were located adjacent to trench drains in the Plating
Room (Dept. 20). Boring SSS-9 was located adjacent to the Tresco Warehouse in an area
where a former waste sump was reportedly maintained. Boring locations are depicted on Figure
1. Borings were advanced to approximate depths of 8-9 feet below the ground surface (bgs).
Soils at the 8-9 foot interval were damp to wet, indicative of the presence of groundwater.
Limited Sub-Slab Investigation
IRC-Former Boone Facility • Boone, Watauga County, NC
September 17, 2013 • Terracon Project No. 86127103
2.2 Soil Sample Collection and Field Screening
lrerracon
Soil samples were collected from each boring within clear plastic liners. Sample characteristics
were described by the field professional and then screened with a MiniRae2000 photo-ionization
detector (PID) for the presence of organic vapors. The lithology of the soils generally consisted
of silty/sandy clay or clayey/sandy silt. Soil lithology and data from field screening activities are
presented on the boring logs included in Appendix B.
One soil sample per boring (except for SSS-6) was selected for laboratory analysis based upon
field screening results, odors, staining, or other indicators of potential impact. Two soil samples
were collected from boring SSS-6 based upon observed changes in soil coloration and odors.
Prior to sample collection, non-dedicated sampling equipment was decontaminated using a
Liquinox®/water wash and scrubbing, followed by a distilled water rinse. Soil cuttings and
decontamination fluids were containerized in 55-gallon drums pending off-site disposal.
Following sample collection, the soil borings were backfilled to the ground surface using a
bentonite-grout slurry.
3.0 LABORATORY ANALYSES AND RESULTS
3.1 Laboratory Analyses
Eleven soil samples were submitted for analysis to Shealy Environmental Services, Inc. in West
Columbia, SC (NC DENR No. 329). The soil samples were submitted for analysis of vo latile
organic compounds (VOCs) by EPA Method 8260B (all samples), semi-volatile organic
compounds (SVOCs) by EPA Method 82700 (samples SSS-1-8, SSS-2-8, SSS-3-6, and SSS-
9-6), and lead and nickel by EPA Method 6010C (samples SSS-4-2, SSS-5-6, SSS-6-2, SSS-6-
6, SSS-7-4, SSS-8-6, SSS-9-6, and SSS-10-8). Please refer to Appendix C for a copy of the
laboratory analytical report and associated chain of custody.
3.2 Soil Analytical Results
Results generated from soil sample analysis were compared to the Preliminary Soil
Remediation Goals (PSRGs) established by the North Carolina Department of Environment and
Natural Resources (NCDENR) -Inactive Hazardous Site Branch (IHSB), updated July 13,
2013. The IHSB has established health-based PSRGs for residential and industrial settings as
well as for Protection of Groundwater (PoG).
Several VOCs were detected in the analyzed samples (see Table 1 ). Based on the results,
tetrachloroethylene (commonly referred to as "perc" or "PCE") was detected at concentrations
exceeding the applicable PSRG for PoG of 5 IJg/kg in four of the 11 samples analyzed.
Trichloroethylene (TCE) was detected in one sample (SSS-4-2) at a concentration exceeding
the applicable PSRG for PoG of 18 IJg/kg. The remaining detected VOCs were below their
respective applicable PSRGs.
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Limited Sub-Slab Investigation
IRC-Former Boone Facility • Boone, Watauga County, NC
September 17, 2013 • Terracon Project No. 86127103
lrerracon
It should be noted that PCE was reported in sample SSS-7-4 at a concentration of 19 IJg/kg; this
sample was orig inally analyzed at a 50-times dilution based upon a laboratory screening error
(see letter from Shealy in Appendix C) before being re-analyzed at a zero-dilution but outside of
the holding time. The results of the zero-dilution analysis are presented in Table 1. It is
Shealy's opinion that the reported PCE value for sample SSS-7-4 is likely to be biased low
meaning that the detected PCE value analyzed under normal conditions would be higher.
Fluoranthene was detected in one of the four samples analyzed for SVOCs (SSS-3-6) at a
concentration of 660 IJg/kg . The detected concentration is significantly below the applicable
PSRGs for fluoranthene. No other SVOCs were detected in the samples analyzed.
Lead and nickel were detected in all eight of the samples analyzed for these metals. The lead
detections were significantly less than the applicable PSRGs. The IHSB has not established
PSRGs for nickel; however, the reported concentrations appear to be indicative of naturally
occurring nickel concentrations in this area of North Carolina and not from anthropogenic
sources (reference: Geochemical Landscapes of the Conterminous United States-New Map
Presentations for 22 Elements, U.S. Geological Survey Professional Paper 1648).
4.0 CONCLUSIONS AND RECOMMENDATIONS
Based upon the above information, we offer the following conclusions and recommendations.
4.1 Conclusions
PCE was detected above the PSRG for PoG in samples collected from borings SSS-4, SSS-6,
SSS-7, and SSS-8. TCE was also detected above the PSRG for PoG in the sample collected
from boring SSS-4. Boring SSS-4 was advanced near a former industrial wastewater discharge
sump within the Recovery Room. Borings SSS-6 through SSS-8 were advanced adjacent to
former trench drains in the old Plating Room, Sludge Accumulation Area, and Plating Room,
respectively.
Based on the laboratory results, past facility operations have apparently impacted sub-slab soils
in the vicinity of the floor drains and wastewater discharge sump. Figure 2 depicts the
estimated lateral extent of soil impact based on the analytical data derived during this
investigation. Based on the apparent depth and magnitude of impact to the soils and the
estimated depth to groundwater (approximately 9-10 feet below ground surface), it is Terracon's
opin ion that groundwater in these areas may also be impacted by PCE and/or TCE.
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Limited Sub-Slab Investigation
IRC-Former Boone Facility 11 Boone, Watauga County, NC
September 17, 2013 • Terracon Project No. 86127103
4.2 Recommendations
lrerracan
Additional soil sampling for VOCs is recommended along the trench drain systems and in the
vicinity of the former wastewater sump to more adequately assess the extent of soil impact in
these areas. Terracon also recommends sampling of the groundwater in these areas. Based
on the uncertainty of site redevelopment plans, we recommend that sub-slab soils impacted
above PSRGs be remediated prior to site redevelopment. The find ings presented herein and
from any subsequent assessment should be provided to the NCDENR-I HSB for review.
5.0 QUALIFICATIONS
Terracon's services were performed in a manner consistent with generally accepted practices of
the profession undertaken in similar studies in the same geographic area during the same
period. Terracon makes no warranties, expressed or implied, regarding its services, findings,
conclusions, or recommendations. Please note that Terracon does not warrant the work of
laboratories, regulatory agencies or other third parties supplying information used in the
preparation of the report. Our services were performed in accordance with the scope of work
agreed with you, our client, as set forth in our proposal and are not intended to be in strict
conformance with ASTM E1903-11.
Findings, conclusions, and recommendations presented herein are based upon information
derived from on-site activities and other services performed under this scope of work; such
information is subject to change over time. Certain indicators of the presence of hazardous
substances, petroleum products, or other constituents may have been latent, inaccessible,
unobservable, non-detectable, or not present during these services; thus, we cannot represent
that the site is free of hazardous substances, toxic substances, petroleum products, or other
latent conditions beyond those identified during this LSSI. Subsurface conditions may vary from
those encountered at specific borings or wells or during other surveys, tests, assessments,
investigations or exploratory services; the data, interpretations, findings and our
recommendations are based solely upon data obtained at the time and within the scope of these
services.
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FIGURES
APPENDIX A
TABLE 1