18038_AquAir II_ Remedial Investigation Report_20011026

VOLUMEIOFX
REMEDIAL INVESTIGATION REPORT
AQUAIRSITE
CHARLOTTE, NORTH CAROLINA
NCD 074511361
Prepared For Submittal to
North Carolina
Department of Environment and Natural Resources
Division of Waste Management
Superfund Section
Inactive Hazardous Sites Branch
401 Oberlin Road
Raleigh, North Carolina 27605
Prepared by
S & ME, Inc.
9751 Southern Pine Boulevard
Charlotte, NC 28273
October 2001
•s&ME
October 26, 2001
North Carolina Department of Environmental and Natural ~ources
Inactive Hazardous Sites Branch
Superfund Section
Division of Waste Management
401 Oberlin Road
Raleigh, North Carolina 27605
Attention:
Reference:
Mr. John W. Walch
Environmental Engineer
REMEDIAL INVESTIGATION REPORT
AQUAfRSITE
Charlotte, Mecklenburg County, North Carolina
Site No. NCD 074511361
S&ME Project No. 1354-97-175 A
Dear Mr. Walch:
S&ME is pleased to submit to the North Carolina Department of Environment and Natural
resources ("NCDENR") the enclosed Remedial Investigation Report for the AquAir Site in
Charlotte, Mecklenburg County, North Carolina. The report consists of ten volumes and includes
Volume I with text, tables and figures, and nine volumes of appendices with the required
information.
S&ME, Inc.
9751 Southern Pine Blvd.
Charlotte, North Carolina 28273
Mailing address:
P.O. Box 7668
Charlotte, North Carolina 28241-7668
[phone]
[phone] fax
vvw-'.rv.s mei nc ~cofli"J
REMEDW, INVESTIGATION REPORT
AQUAIR SITE-CHARLOTTE. NORTII CAROLINA
S&ME Project No. 1354-975175 A
October 26, 2001
S&ME appreciates your assistance in this project. Do not hesitate to us at [phone] if you
have any questions or need any additional information.
Very truly yours,
S&.M.'E~ Inc.
c~~~~~~~
Conrad T. Law-rcrice
Senior Hydro geologist
Dane A. Homa, P .E.
Environmental Services ManagerN.P.
CTL/DAH/ctl
Enclosures
cc: Marshall Gilchrist
Steve DeGeorge -Robinson, Bradshaw & Hinson
2
\\CHARNC\VOL 1\S.HARE\1354\FROJECT\1997\97-175A AquAir II\RI Report\Rl Report LOT-0 I.doc
'
North Carolina Department of Environment
md Natural Resources
ivision of Waste Management
_ .iperfund Section
Inactive Hazardous Sites Bnmch
REMEDIAL INVESTIGATION COMPLETION CERTIFICATION
15A NCAC 13C.0306 5
Site Name: Aqn A j r
Councy: Mecklenburg
SiteIDNo.: NCD 074511361
Street Address: 13300 Sam Neely Road
Charlotte, NC
28273
The remedial investigation which is the subject of this certification bas, to the best of my
knowledge, been completed in compliance with the Inactive Hazardous Sites Response Act
G.S. 130A-310, et seq. and the voluntary remedial action program Rules 15A NCAC 13C
.0300, and S&ME' Inc· is in compliance with Rules
.0305(b )(2) and . 0305(b )(3), of this Section. I am aware that there are significant penalties
for willfully submitting false, inaccurate or incomplete information.
tGr~ -r. <~-=-S1gn e
f;;cmrad T. r.awrence
RSM Name
S&ME Inc.
REC Name
00004
REC No.
Oct. 25, 2001
Date
P.O. Box 7668
Mailing Address
Charlotte, NC 28241
City, State, ZIP
~ c?~Enter State) ~COUNTY
I, ~~ <!.rU~ , a Notary Public of said County and State, do hereby
certify that ~ ~~ did personally appear and sign before
me this the~ day of~ , ;:v:>C> I.
:---~i!w~r+-) --· -------~---'-(v0FF££.iJICwI.n.AIJ..,._ . ..;>S;E~Ail.L.._,____)
My commission expires: r 19' d_t) I I
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EXECUTIVE SUMMARY
REMEDIAL INVESTIGATION REPORT
AquAir Site
Charlotte, Mecklenburg County, North Carolina
S&ME, Inc. has conducted a Remedial Investigation (RI") at the AquAir Site (the "Site") in
southwestern Charlotte, Mecklenburg County, North Carolina near Westinghouse Boulevard.
The Site is located at the terminus of Sam Neely Road in a commercial and light industrial area
with a new residential development being constructed to the south.
The Site consists of a 2-acre former industrial facility (the "Former Facility") within a 154-acre
undeveloped, heavily wooded tract. The Former Facility had a perimeter fence and contained the
shells of a former production building and laboratory building. A septic tank and drain line were
located along the eastern side of the former production building. The Site contains upland areas
south and southwest of the Former Facility, and in the northern and eastern potions of the Site
toward Westinghouse Boulevard and Goodrich Drive.
An intermittent stream (the "Unnamed Creek") is located on the Site approximately 900 feet
northeast and east of the Former Facility. A bermed Norfolk Southern Railroad track and
Charlotte/Mecklenburg County Utility Department ("CMUD") municipal sewer line are located
between the Facility and the Unnamed Creek. The stream has been dry since 1999/2000 except
during rainfall events.
Operations at the Former Facility consisted of: (1) vanadium pentoxide catalyst manufacturing from
1965 to 1972; (2) solvent recovery, reclamation, and blending from 1974 to 1984; (3) bulk chemical
repackaging from 1974 to 1976; and (4) laboratory services and chromium compound
manufacturing from 1977 to 1988. No manufacturing activities have been conducted at the Site
since 1988.
RI REPORT -EXECUTIVE SUMMARY
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Because of suspected soil and/or groundwater contamination at the Site, the North Carolina
Superfund Section performed Phase I and Phase II Screening Site Inspections in 1990.
Subsequent to these inspections, Delta Environmental Consultants ("Delta") conducted a more
comprehensive investigation in 1992-1993 for the owners of the Site. The Delta investigation
confirmed several areas of soil and sediment contamination, and groundwater contamination,
principally chlorinated volatile organic compounds ("VOCs"), in the Shallow Aquifer.
As follow-up to the Delta investigation, Geraghty & Miller, Inc. ("G&M") performed
supplemental investigation activities in 1995-96. The G&M investigation further refined the
definition of the extent of soil contamination and Shallow Aquifer groundwater contamination.
S&ME performed a Supplemental Site Investigation ("SSI") in 1997/1998 to collect additional
data to evaluate the extent and magnitude of contamination at the Site in order to identify
potential remedial options. The Remedial Options Evaluation ("ROE") was performed to assess
the effectiveness, implementability, and preliminary costs of selected remedial options.
The AquAir RI consisted of data-gathering activities focused on refinement of Site
hydro geologic conditions, and enhanced delineation of the groundwater plumes in the Shallow
and Bedrock aquifers. The RI has been performed under contract to Robinson, Bradshaw &
Hinson, P.A. ("RBH").
The following conclusions have been derived from data from the AquAir RI, the S&ME SSI, and
the Delta and G&M investigations:
l. The hydrogeologic sequence at the Site generally consists of two units, the Shallow
Aquifer and the Bedrock Aquifer. Neither aquifer is known to be used for potable-water
supply in the area because service is provided by the municipal water-supply system, and
no potable-water supply wells were identified within 2,500 feet of the Site. The Shallow
Aquifer is formed by the unconsolidated materials, which range in thickness from 15 to
50 feet. The Shallow Aquifer is under water-table aquifer conditions. Groundwater flow
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RI REPORT -EXECUTIVE SUMMARY
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
is generally to the east from the Former Facility. Groundwater in the northeastern and
eastern upland portions of the Site is flowing to the west and southwest, respectively.
Discharge from the Shallow Aquifer is believed to be to the Unnamed Creek located in
the center of the Site, about 900 feet east of the Facility, and downward into the Bedrock
Aquifer.
The Bedrock Aquifer is present below the Shallow Aquifer and the upper portion of the
aquifer is in direct hydraulic connection with the Shallow Aquifer. The lower portion
appears to be somewhat isolated from the Shallow Aquifer in some areas of the Site.
Groundwater in the Bedrock Aquifer is present in fractures. Groundwater-bearing
fractures were found to depths of approximately 150 feet below land surface ("BLS").
Groundwater flow is generally to the east. Discharge from the Bedrock Aquifer is
believed to be to Steele Creek, which is located approximately 1.0 mile east of the Site.
2. Surface water (when flowing) and sediments in the creek do not appear to have been
impacted. After stream flow ceased, low concentrations (10 µg/L) of two chlorinated
voes were detected in samples of pooled water in the streambed.
3. Shallow soils at the Former Facility have been impacted by metals, including chromium
(both hexavalent and trivalent), lead, arsenic, cadmium, and vanadium, and chlorinated
VOCs, although some impact from semi-volatile organic compounds (''SVOCs") is
present. Metals, including principally chromium with subsidiary amounts of lead, and
vanadium, have impacted sediments at the Site in two small drainage swales east of the
Former Facility. Background soil and sediment samples have detected concentrations of
naturally occurring Vanadium.
Most of the contaminated soil is located beneath or adjacent to the former production
building (tetrachloroethene, arsenic, cadmium, vanadium, and lead are cleanup
objectives), the laboratory building, and the septic tank (carbon tetrachloride and arsenic
are above cleanup objectives). The southeastern concrete slab of the former production
Ill
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RI REPORT -EXECUTIVE SUMMARY
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
building, and potentially some of the soil beneath the slab, appeared to be hazardous for
chromium based on Toxicity Characteristics Leaching Procedure ("TCLP"), and would
be a D007 waste.
Surficial soils in three areas east of the former production building also contained
vanadium pentoxide pellets. Surficial soils in the area of the former laboratory building
contain vanadium pentoxide pellets. Removal of the vanadium-pentoxide pellets in these
areas was performed as an Interim Remedial Measure.
4. Groundwater in the Shallow Aquifer is contaminated principally by chlorinated VOCs
although some non-chlorinated VOCs are also present. As many as 20 VOCs exceed
their respective North Carolina Administrative Code 2L Groundwater Standard ("2L
Standard"), and include benzene, carbon tetrachloride, tetrachloroethene, trichloroethene,
chloroform, methylene chloride, 1,1,1-trichloroethane, 1,1-dichloroethene, 1,2-
dichloroethane, and vinyl chloride. The highest detected VOC concentrations exceed 150
milligrams per liter ("mg/L") near the former septic tank and drain line. Groundwater in
the area of the septic tank and drain line is also contaminated by chromium above its 2L
Standard. Some groundwater impact in the Shallow Aquifer from SVOCs is present at
and immediately adjacent to the Former Facility.
The Shallow Aquifer groundwater VOC plume extends generally east from the former
Facility. The central portion of the plume, with Total VOC concentrations greater than
100 mg/L, appears to be approximately 700 feet long (east-west) and only about 50 feet
wide (north-south). The extremely linear nature of the central portion of the plume
indicates that a structural feature (fault or joint) in the Saprolite exerts primary control
over migration. The Shallow Aquifer plume is estimated to have migrated approximately
1,200 feet from the release sources in an easterly direction and extends to east of the
Unnamed Creek. Based on the configuration shown in Figure 7-2, the Shallow Aquifer
groundwater voe plume is estimated to cover approximately 20 acres.
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RI REPORT -EXECUTIVE SUMMARY
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
5. Groundwater in the Bedrock Aquifer is contaminated principally by chlorinated VOCs,
although some non-chlorinated voes are also present, and at least 12 voes are present
above 2L Standards. Other VOCs, as listed in Item 4 above, may exceed their respective
2L Standards but are masked by the high concentrations of the other VOCs. Maximum
voe concentrations are greater than 200 mg/L.
VOC contamination in the Bedrock Aquifer extends to a depth of approximately 150 feet
BLS. Boundary conditions for the VOC plume have been determined to the west, north,
northeast. Plume boundaries to the east and south are projected due to movement of the
plume between the time that the test boreholes were sampled and subsequent monitoring
wells installed in the boreholes were sampled. The confidence level, however, of the
projections is high because sample-analytical data indicate that the plume migrated into
the eastern area between June 1997 and October 1998 and into the southern area between
November 1998 and April 1999.
The Bedrock Aquifer plume is estimated to have migrated approximately 1,200 feet from
the release source in an easterly ( downgradient) direction. The plume appears to extend
to the east of the Unnamed Creek. Based on the configuration shown in Figure 8.3, the
Bedrock Aquifer groundwater VOC plume is estimated to cover approximately 17 acres.
The central portion of the Bedrock Aquifer plume appears to be oriented east similar to
the Shallow Aquifer plume. The linear nature of the central portion of the plume
indicates that a structural feature (fault or joint) in the Bedrock exerts a primary control
over migration in this area. The apparent southward movement of the plume implies that
another permeable fracture system in the bedrock, oriented north-south, is exerting
control in this area.
Borehole ATB-08 (well AMW-608) is located across the Unnamed Creek almost 1,300
feet northeast of the Former Facility. Groundwater flow in the Bedrock Aquifer in this
area appears to be moving from the northeast to the southwest toward the Unnamed
Creek. VOCs detected in samples collected from this borehole and well are believed to
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RI REPORT -EXECUTIVE SUMMARY
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
indicate the presence of another release source not related to the former AquAir Facility.
PCE, TCE, Chlorobenzene, and Toluene have been detected at this location and these
VOCs are constituents of concern at the former AquAir Facility. However, Chloroform
and Carbon Tet, which are the primary constituents of concern, have not been detected.
In addition, borehole ATB-06, where no VOCs have been detected, is located between
AMW-608 (ATB-08) and the Bedrock Aquifer plume originating at the former septic
tank and drain line.
Several Interim Remedial Measures ("IRMs") have been performed at the AquAir Site to
mitigate further environmental impacts, and reduce potential safety and exposure risks. The
IRMs include the following.
1. The skeletons of the former laboratory and production building were demolished in May
1999 and the debris either recycled or disposed of off-Site.
2. The former septic tank, and associated drain line were removed and disposed of at the
Browning Ferris, Inc. ("BPI") Charlotte Motor Speedway ("CMS") Landfill in Concord,
North Carolina on March 13, 2000. Fluids contained in the septic tank were pumped out
and disposed of off-Site.
3. The concrete floor slab and approximately two feet of underlying soil of the former
production building were removed in May and July 2000. Hazardous waste (Chromium)
concrete and soil were disposed off Site by Sentury Reagents of Rock Hill, South
Carolina, at the Safety-Kleen (Pinewood), Inc. ("Safety-Kleen") facility in Pinewood,
South Carolina. The concrete was microencapsulated prior to disposal. The non-
hazardous concrete and soil was disposed off Site at the BFI CMS Landfill.
4. V anadium-pentoxide pellets and associated soil were excavated from areas east, north, and
northwest of the Former Facility in February 1999, and disposed of off Site at the BPI CMS
Landfill.
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RI REPORT -EXECUTIVE SUMMARY
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
5. A Bedrock Aquifer Groundwater Recovery System ("GWRS") was installed at the Site to
gain hydraulic control of the groundwater plumes. The IRM GWRS was necessitated by the
apparent rate of migration of the Bedrock Aquifer groundwater plume (see Item No.5 above
Page iv. Continuous operation commenced on November l, 2000. By September 1, 2001,
the IRM GWRS has maintained a pumping rate of 11 to 12 gpm and has recovered,
treated, and discharged approximately 4,800,000 gallons of affected groundwater. Tue
system has been out of operation less than 8.0 percent of the time due to routine
maintenance, and unplanned shutdowns due to power outages and PLC programming.
Drawdown in the Bedrock Aquifer measured approximately 10.5 months after GWRS
startup and extends beyond the well network at the Site. The drawdown cone is distinctly
elongated to the south with a drawdown zone of more than 4.0 feet apparently extending
well beyond the well/test borehole network.
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Table of Contents
1.0 INTRODUCTION .......................................................................................................................................... 1-1
1.1 PROJECT DESCRIPTION ......................................................................................................................... 1-1
1.2 SITE BACKGROUND ............................................................................................................................... 1-3
1.2.l Site Description .................................................................................................................................. 1-3
1.2.2 Site History ...................................................................................................................................... 1-10
1.3 NATURE AND EXTENT .............................................................................. : .......................................... 1-10
1.4 HISTORICAL RELEASE SOURCES ...................................................................................................... 1-11
Figure 1-1: USGS Topographic Map Project Location Map ...................................................... 1-2
Figure 1-2: Site Property Boundaries ......................................................................................... 1-4
Figure 1-3: 1999 Aerial Photograph ........................................................................................... 1-5
Figure 1-4: Site Topography ....................................................................................................... 1-6
Figure 1-5: Surrounding Properties ............................................................................................ 1-8
Figure 1-6: Site Map ................................................................................................................... 1-9
Table of Contents
2.0 REMEDIAL INVESTIGATION SUMMARY ................................................................ 2-1
2.1 PURPOSE AND STRUCTURE ···················································································································· 2-1
2.2 REMEDIAL INVESTIGATION WORK PLAN ...................................................................................................... 2-1
2.2.1 Quality Assurance Project Plan ......................................................................................................... 2-1
2.2.2 Site Health and Safety Plan ............................................................................................................... 2-2
2.2.3 Data Management Plan ..................................................................................................................... 2-2
2.2.4 Sampling and Analysis Plan .............................................................................................................. 2-2
2.3 SITE MAPS .................................................................................................................................................... 2-3
2.4 RI REPORT APPENDICES ORGANIZATION ..................................................................................................... 2-3
2.5 WELL INVENTORY ........................................................................................................................................ 2-3
2.6 SAMPLE CHEMICAL ANALYSES AND DATA VALIDATION .......................................................... 2-3
2.6.1 Screening Analyses .......................................................................................................................... 2-10
2.6.2 VOC, SVOC, and Metals Analyses ................................................................................................... 2-10
2.7 SITE INVESTIGATIONS ................................................................................................................................ 2-10
2.7.1 Overview .......................................................................................................................................... 2-10
2. 7.2 Shallow Soil and Sediment Sampling ............................................................................................... 2-11
2.7.3 Geoprobe™Sampling ..................................................................................................................... 2-11
2. 7.4 Surface-Water and Sediment Sampling ............................................................................................ 2-11
2. 7.5 Shallow Aquifer Assessment ............................................................................................................. 2-12
2. 7. 6 Bedrock Aquifer Assessment ............................................................................................................ 2-14
2.8 INTERIM REMEDIAL MEASURES ....................................................................................................... 2-16
Table 2-1: Summary of R1 Report Appendices .......................................................................... 2-4
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Table of Contents
3.0 AREA FEATURES ........................................................................................................................................ 3-1
3.1 LANDUSE .....................•.....•..............................................•.........................................................•.•............. 3-1
3 .2 NATURAL RESOURCES .......................................•....................................................................................•..•.. 3-1
3.3 CLJMATE ..........................................................................................•........•......................•........................... 3-2
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Table of Contents
Table 4-12: Geraghty & Miller Historical Soil VOC Data .................................................................................... 4-24
Table 4-13: Geraghty & Miller Historical Soil SVOC Data .................................................................................. 4-25
Table 4-14: Geraghty & Miller Historical Soils Metals Data ................................................................................ 4-26
Table 4-15: Detected Volatile Organic Compound Shallow Aquifer Groundwater Samples ................................. 4-30
Table 4-16 GROUNDWATER SAMPLE INORGANIC ANALYTICAL RESULTS .................................................. 4-31
Table 4-17: Selected Bedrock Well Groundwater Sample VOC Data .................................................................... 4-33
Table 4-18 SEDIMENT SAMPLE METALS ANALYTICAL RESULTS ................................................................... 4-37
Table 4-19 CONCRETE/SOIL SAMPLE TCLP RESULTS -DETECTED CONSTITUENTS ................................. 4-38
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Table of Contents
4.0 REVIEW OF EXISTING DATA .................................................................................................................. 4-1
4.1 PRELIMINARY ASSESSMENT-JUNE 1985 ..................................................................................................... 4-1
4.2 PHASE I SUPPLEMENTAL SITE INVESTIGATION-OCTOBER 1990 ................................................................. 4-1
4.3 PHASE II SCREENING SITE INVESTIGATION -OCTOBER 1990 ....................................................................... 4-2
4.3.1 Soil and Sediment Sample Analytical Results .................................................................................... 4-2
4.3.2 Swface and Groundwater Sample Analytical Results ....................................................................... 4-8
4.4 REMEDIAL SITE EVALUATION AND REMOVAL SITE EVALUATION -JANUARY 1994 .................................... 4-8
4.4.1 Groundwater Sample Analytical Results ........................................................................................... 4-9
4.4.2 Soil and Sediment Sampling Analytical Results ............................................................................... 4-16
4.5 ADDITIONAL SITE INVESTIGATION -SEPTEMBER 1996 .............................................................................. 4-16
4.5. l Groundwater Sampling Analytical Results ...................................................................................... 4-20
4.5.2 Soil and Sediment Sampling Analytical Results ............................................................................... 4-23
4.6 SUPPLEMENTAL SITE AND REMEDIAL OPTIONS EVALUATION -FEBRUARY 1997 ...................................... 4-23
4.6.1 Shallow Aquifer Groundwater Investigation ................................................................................... 4-27
4.6.2 Bedrock Aquifer Groundwater Investigation ................................................................................... 4-31
4.6.3 Swface Water and Sediment Sampling ............................................................................................ 4-34
4. 6.4 Soil and Sediment Sampling ............................................................................................................. 4-36
4.6.5 ·waste Classification Sampling. ........................................................................................................ 4-37
Figure 4-1: Greenhome & O'Mara Sampling Points ................................................................................................ 4-3
Figure 4-2: Delta Environmental Sampling Points ................................................................................................. 4-10
Figure 4-3: Geraghty & Miller Sampling Locations ............................................................................................... 4-21
Figure 4-4: Groundwater Sampling Locations ........................................................................................................ 4-28
Figure 4-5: Soil, Sediment, and SW Sampling Locations ...................................................................................... 4-35
Table 4-1: Greenhorne & O'Mara Historical VOC Data ........................................................................................ 4-4
Table 4-2: Greenhorne & O'Mara Historical SVOC Data ...................................................................................... 4-5
Table 4-3: Greenhorne & 0 'Mara Historical Metals VOC Data ............................................................................ 4-6
Table 4-4: Delta Historical Groundwater VOC Data ............................................................................................ 4-11
Table 4-5: Delta Historical Groundwater SVOC Data .......................................................................................... 4-13
Table 4-6: Delta Historical Groundwater Metals Data ......................................................................................... 4-14
Table 4-8: Delta Historical Test Trench Soils Metals Data ................................................................................... 4-17
Table 4-9: Delta Historical VOC Data for Soils and Sediments ............................................................................ 4-18
Table 4-10: Delta Historical Metals Data for Soils and Sediments ....................................................................... 4-19
Table 4-11: Geraghty & Miller Historical Groundwater VOC Data ..................................................................... 4-22
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Table of Contents
5.0 HYDROGEOLOGIC SETTING .................................................................................................................. 5-1
5.1 REGIONAL HYDROGEOLOGY .............................................................................................................. 5-1
5.1.l Geology .............................................................................................................................................. 5-l
5.1.2 Groundwater Hydrology .................................................................................................................... 5-3
5 .2 SURFACE-WATER HYDROLOGY AND SITE DRAINAGE ................................................................. 5-3
5.3 SITE GEOLOGY ........................................................................................................................................ 5-4
5.3.l Geologic Sequence ............................................................................................................................. 5-8
5.4 GROlJNDWA TER HYDROLOGY ............................................................................................................ 5-9
5.4. l Hydro geologic Sequence ................................................................................................................. 5-10
5.4.2 Shallow Aquifer ................................................................................................................................ 5-10
5.4.3 Bedrock Aquifer ............................................................................................................................... 5-15
Figure 5-1: Surface Water and Drainage .................................................................................... 5-5
Figure 5-2: Wells and Test Boreholes ........................................................................................ 5-6
Figure 5-3: Shallow Aquifer Groundwater Contour Map (10-26-00) ...................................... 5-11
Figure 5-4: Bedrock Aquifer Groundwater Contour Map (10-26-00) ...................................... 5-19
Table 5-1: Groundwater Level Data ......................................................................................... 5-12
Table 5-2: Bedrock Discrete Interval Hydraulic Testing .......................................................... 5-16
VI
Table of Contents
6.0 SURFACE-WATER, SEDIMENT, AND SHALLOW SOIL CHEMICAL QUALITY .......................... 6-1
6.1 SURFACE-WATER SAMPLES ................................................................................................................. 6-1
6.2 SEDIMENT SAMPLES ...................................................................................................................................... 6-3
6.3 SHALLOW SOIL SAMPLES ........................................................................................................................ 6-5
6.4 ANALYTICAL DA TA ANALYSIS ..................................................................................................................... 6-6
Figure 6-1: Surface Water and Soil Sample Locations ............................................................... 6-2
Table 6-1 SEDIMENT SAMPLE METALS ANALYTICAL RESULTS .................................. 6-4
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Table of Contents
7.0 SHALLOW AQUIFER GROUNDWATER QUALITY ............................................................................. 7-1
7 .1 VOLATILE ORGANIC COMPOUNDS .................................................................................................... 7-5
7.2 SEMI-VOLATILE ORGANIC COMPOUNDS ......................................................................................... 7-7
7.3 CONTAMINATION ANALYTICAL DATA EVALUATION .................................................................. 7-7
Figure 7-1: Shallow Aquifer Monitoring Points ......................................................................... 7-2
Figure 7-2: Shallow Aquifer VOC Contour Map ....................................................................... 7-8
Table 7-1: Shallow Aquifer Sample VOC Analytical Results Summary -Existing Delta
Monitoring Wells ................................................................................................................. 7-3
Table 7-2: Shallow Aquifer Sample VOC Analytical Results Summary -S&ME Monitoring
Wells .................................................................................................................................... 7-4
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Table of Contents
8.0 BEDROCK AQlJIFER GROUNDWATER QUALITY ............................................................................. 8-1
8.1 DISCRETE-INTERVAL GROUNDWATER SAMPLING ....................................................................... 8-1
8.1.1 Volatile Organic Compounds ............................................................................................................. 8-3
8.1.2 Chromium .......................................................................................................................................... 8-8
8.1.3 Field Water-Quality and Natural Attenuation Parameters .............................................................. 8-13
8.2 MONITORING WELL SAMPLING ........................................................................................................ 8-17
8.2.l Volatile Organic Compounds ........................................................................................................... 8-17
8.2.2 Abandoned Water-Supply Well ........................................................................................................ 8-19
8.3 GROUNDWATER ANALYTICAL DA TA ANALYSIS ......................................................................... 8-19
Figure 8-1: Bedrock Aquifer Monitoring Points ........................................................................ 8-2
Figure 8-2: Bedrock Test Borehole Discrete-Interval VOCs ..................................................... 8-9
Figure 8-3: Bedrock Aquifer VOC Contour Map ..................................................................... 8-21
Table 8-1: VOC Analytical Results Summary -RI Phase II Bedrock Test Boreholes Discrete
Samples ................................................................................................................................ 8-4
Table 8-2: Chromium Results Summary, RI Phase II-Bedrock Test Boreholes Discrete-Interval
Samples .............................................................................................................................. 8-10
Table 8-3: Bedrock-Aquifer Discrete Interval Sample Field Water-Quality Data ................... 8-14
Table 8-4: Bedrock Aquifer Monitoring Well VOC Summary ................................................ 8-18
IX
Table of Contents
9.0 INTERIM REMEDIAL MEASURES .......................................................................................................... 9-1
9.1 BUILDING DEMOLITION ........................................................................................................................ 9-1
9.2 SEPTIC TANK REMOVAL ....................................................................................................................... 9-4
9.3 CONCRETE SLAB AND SOIL REMOVAL ............................................................................................. 9-4
9.4 VANADIUM-PENTOXIDE PELLETS REMOVAL. .................................................................................. 9-5
9.5 BEDROCK AQUIFER GROUNDWATER RECOVERY SYSTEM ......................................................... 9-5
9.5.J Aquifer Test ........................................................................................................................................ 9-6
9.5.2 !RM GWRS Operation ....................................................................................................................... 9-8
Figure 9-1: IRM Soil Management Areas .................................................................................. 9-2
Figure 9-2: IRM Bedrock Aquifer Groundwater Recovery System ........................................... 9-3
Figure 9-3: Bedrock Aquifer Drawdown Contour Map 11/16/2000 (Two Weeks) ................. 9-12
Figure 9-4: Bedrock Aquifer Drawdown 09/14/2001 (10.5 Months) ....................................... 9-13
Tahle 9-1: Bedrock Aquifer Test -Groundwater Sample VOC Results .................................... 9-7
Table 9-2: IRM Water Level Drawdown Data ........................................................................... 9-9
Table 9-2: IRM Water Level Drawdown Data .......................................................................... 9-10
x
RI REPORT -CHAPTER 1
AQUAIR REMEDIAL INVESTIGATION
1.0 INTRODUCTION
October 2001
S&MEProjectNo. 1354-97-175 A
The AquAir Site is located at 13300 Sam Neely Road in southwestern Charlotte, Mecklenburg
County, North Carolina along Westinghouse Boulevard in a commercial and light-industrial area.
The Site consists of a 2-acre former industrial facility (the "Facility") within a 154-acre
undeveloped, heavily wooded tract owned by SNL Corp. and SNL Limited Partnership (collectively
"SNL"). Currently, no commercial or industrial activities are occurring at the Site. The Site
location is shown in Figure 1-1.
Chemical releases occurred during the period that AquAir Corporation leased and operated the
Facility. SNL subsequently executed an Agreement on Consent with the North Carolina
Department of Environment and Natural Resources ("DENRC") on October 28, 1998. S&ME,
Inc. ("S&ME") has performed this Remedial Investigation ("RI") under contract with SNL's
legal counsel, Robinson, Bradshaw & Hinson, P.A. ("RBH").
1.1 PROJECT DESCRIPTION
The objective of the RI was to evaluate the extent of soil and groundwater affected by chemical
releases. The RI consisted of data gathering activities focused principally on the collection of
soil, groundwater, surface-water, and sediment samples for chemical analysis, and evaluation of
hydrogeologic conditions.
In addition, several Interim Remedial Measures ("IRM' s") have been performed to reduce the
potential for personnel injury/accidents, remove disposed waste, and control additional impacted
groundwater migration. The IRMs include: (1) removal of vanadium-pentoxide pellets, and
contaminated portions of floor slabs and underlying soil, (2) demolition of the buildings, and (3)
initiation of a Bedrock Aquifer groundwater recovery well for hydraulic control.
1-1
S:\l 354\PROJECT\l 997\97-l 75A AquAir Il\RI Report\RI Chapt I -02.doc
~.-...,.,L ...
....... \
\
SCALE:
CHECKED BY:
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DATE:
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09/02/01
USGS TOPO PROJECT LOCATION MAP I FIGURE NO.
AUQAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NC j 1-1 SIME
rn,1ROtfolEN1.~-SE~vCES • <fl01f.EORlf.C • -;s11~c I JOB NO. 1354-97-175 a
RI REPORT -CHAPTER 1
AQUAIR REMEDIAL INVESTIGATION
1.2 SITE BACKGROUND
October 2001
S&ME Project No. 1354-97-175 A
A description of the Site and surrounding area is presented in this section. In addition, pertinent
features, history, operations, and release sources are described. Information contained in this
section was obtained from several sources, including governmental records and previous
consultant reports. A list of abbreviated terms used in this RI Report is presented in Appendix
IX.
1.2.1 Site Description
The 154-acre undeveloped tract is located in the Steele Creek Township. The Site is identified
as Tax Parcel ID No. 20141101 and property boundaries are shown in Figure 1-2. A 1999 aerial
photograph of the Site is shown in Figure 1-3.
The Site is located on the Charlotte West USGS 7.5-minute topographic quadrangle map at north
latitude 35° 07' 35" and west longitude 80° 58' 12". A portion of the topographic map is shown
as Figure 1-1.
In general, topography slopes from the northwest and southwest toward the central portion of the
Site where an intermittent stream is located (Figure 1-1 ). Land surface elevations range from
approximately 640 feet above National Geodetic Vertical Datum ("NGVD") in the southwestern
and northwestern comers to about 610 feet NGVD in the southeastern comer where the stream
exists the property (Figure 1-4 ).
The Site is bounded on the on the east and west by industrial and vacant properties that front on
Goodrich Drive and Steele Creek Road, respectively. Industrial properties east of the Site
include Air Products and Ashland Chemical. Valmet Industries is located along the western
boundary.
1-3
S:\!354\PROJEC1il997\97-175A AquAir 11\RI Report\RI Chapt I -02.doc
2011511S
Norfolk
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SCALE: l" = 600'
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SITE PROPERTY BOUNDARIES FIGURE NO.
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NC 1~2
JOB NO. 1354-97-175 A
Legend
CMUD -Charlotte/Mecklenburg Utility Department
SCALE: I"= 600'
CHECKED BY: CTL
DRAWN BY: JLC
DATE: 09117/01
1999 AERIAL PHOTOGRAPH
AQUAIR REMEDIAL INVESTIGATION)
CHARLOTTE, MECKLENBURG COUNTY, NC
JOB NO. 1354-97-175 A
FIGURE NO.
1-3
20115110
Former
AquAir
Facility
AquAir
Site
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2011
--
--
SITE TOPOGRAPHY
AQUAIR REMEDIAL INVESTIGATION)
CHARLOTTE, MECKLENBURG COUNTY, NC
JOB NO. 1354-97-175 A
2
FIGURE NO.
1-4
RI REPORT -CHAPTER 1
AQUAIR REMEDIAL INVESTIGATION
October 200 I
S&ME Project No. 1354-97-175 A
Westinghouse Boulevard forms the northern boundary with industrial properties on the northern
side. A residential community started in 1999 borders the Site on the South. The surrounding
properties and structures are shown on Figure 1-5.
The former Facility, before demolition in 1999, had a perimeter fence and contained the shells of
a former production building and a former laboratory building (Figure 1-6). The former
production building was approximately 3,500 square feet with metal sides and roof and rested on
a concrete slab that contained floor drains. Aboveground storage tanks were previously located
on an concrete slab adjacent to the southern side of the building. The former laboratory building
was approximately 300 square feet and was of concrete-block construction.
An abandoned water supply well (ESW-1) was located immediately east of the former laboratory
building. A septic tank was located inside of the fence along the eastern side of the former
production building and had a small drain field immediately to the south along side the building.
The floor drains were believed to be connected to the septic tank. The use of the septic tank was
believed discontinued with connection to the Charlotte/Mecklenburg County Utilities
Department ("CMUD") sewer system in the 1970s.
An unnamed intermittent stream ("Unnamed Creek") is located approximately 1,000 feet east of
the former Facility. In general, base flow in the stream has been absent since 1999 due to low-
rainfall conditions. The Unnamed Creek flows to east-southeast and is a tributary to Steele
Creek, which is located approximately one mile east of the former Facility. Steele Creek is a
tributary to the Catawba River.
A railroad spur owned by Norfolk Southern Railroad is located approximately 550 feet east of
the former Facility. The railroad tracks are raised on an earthen berm that is five to seven feet
above natural land surface. A drainage ditch is located on the southern side of the tracks.
Mecklenburg County data (Figures 1-2 through 1-5) indicate that the drainage ditch may have
been a natural stream at one time. However, flow in the Unnamed Creek passes under the
railroad tracks in the central portion of the Site (Figure 1-1 ).
1-7
S:\1354\PROJECT\1997\97-175A AquAir ll\RI Report\Rl Chapt I -02.doc
Vacant
2014211)1
Unnamed
Creek
Former
AquAir
Facility
AquAir
Site
2(
201:.!01
SURROUNDING PROPERTIES
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NC
JOB NO. 1354-97-175 A
FIGURE NO.
1-5
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. ..J
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E
SITE MAP
AQUAIR REMEDIAL INVESTIGATION
CHARLOTIE, NORTH CAROLINA ~I §---~-~-~-1-•1111---' ~ll..._ ______________ (_m_l'JS!;T ___ > __ ................................... _.. ...... _.... ..................... _.. ____________ ......,__.. ______ ......, __________ ....... ________________ .....,......,. ............. ,.._ ...... ..._...._....1.JOB ........ _N0_.~13~5~4~--9~7~-_.:,.17~5~A:.:..L..0_A_~_:~1~1--~0~7--~0~0;......._.Fl_W_~_..N_O. __ a1 __ -__ s_
SCALE: ORA~ BY: MFP QIECKEO BY: AS SHOWN
RI REPORT -CHAPTER 1
AQUAIR REMEDIAL INVESTIGATION
1.2.2 Site History
Industrial operations at the Facility consisted of the following:
October 2001
S&ME Project No. 1354-97-175 A
• vanadium pentoxide catalyst manufacturing from 1965 to 1972;
• solvent recovery, reclamation, and blending from 1974 to 1984;
• bulk chemical storage repackaging from 1974 to 1976; and
• laboratory services and chromium compound manufacturing from 1977 to
1988.
No manufacturing activities have been conducted at the Site since 1988. Removal of chemical
storage and processing equipment was performed in the late 1980's and early 1990's.
1.3 NATURE AND EXTENT
On-Site soils beneath and adjacent to portions of the former production building have been
affected by the release of (1) organic chemicals containing chlorinated and non-chlorinated
volatile organic compounds ("VOCs"), and (2) chromium compounds. In addition, chromium
compounds impacted portions of the floor slab of the former production building.
Chlorinated and non-chlorinated organic compounds are present in groundwater in the on-Site
Shallow and Bedrock aquifers at the former production building. Contaminated groundwater in
both aquifers has migrated eastward to the Unnamed Creek. Surface water in the Unnamed
Creek, however, has not been affected by the discharge of groundwater containing chlorinated
VOCs from the Shallow Aquifer under flow conditions. Under non-flow conditions, low
concentrations of a few chlorinated voes have been detected in samples collected from shallow
isolated pools.
1-10
S:\1354\PROJECT\J 997\97-l 75A AquAir Il\Rl Report\RI Chapt I -02.doc
RI REPORT -CHAPTER 1
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
The Bedrock Aquifer and Shallow Aquifers are not used as a source of potable water in the area.
All properties located within 2,000 feet are connected to the municipal water-supply system.
1.4 HISTORICAL RELEASE SOURCES
Historical release sources at the former production building have been identified and include
principally discharge from the former septic tank, leakage of chemical and waste water from the
former floor drains and through cracks in the concrete slab, and spillage in chemical storage and
handling areas.
1-11
S:\l 354\?ROJEC1\l 997\97-175A AquAir.Il\RI Report\RI Chapt I -02.doc
RI REPORT -CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
2.0 REMEDIAL INVESTIGATION SUMMARY
A summary of the RI is presented in this section. The summary includes a description of the RI
Work Plan, RI and IRM sampling activities, and IRM operations.
2.1 PURPOSE AND STRUCTURE
The purpose of this section is to give a brief overview of the events and activities of the RI and
the documents that were produced in support thereof. Section 2.2 discusses the RI Work Plan
and its components. Section 2.3 describes Site maps that have been developed.
Sampling procedures and analysis methods are described and the various Site investigations that
have occurred during the RI are discussed. A brief overview of the Interim Remedial Measures
("IRMs") that have been performed is also discussed.
2.2 REMEDIAL INVESTIGATION WORK PLAN
The RI Work Plan discussed the scope of work for Phase I of the RI. The objectives of the RI were
to complete the assessment of the nature and extent of contamination at the Site. Included in the
Work Plan were: (1) Appendix I -Sampling and Analysis Plan ("SAP") which includes a Quality
Assurance Project Plan ("QAPP"); and (2) Appendix II -Health and Safety Plan ("HASP").
2.2.1 Quality Assurance Project Plan
The Quality Assurance Project Plan ("QAPP") was prepared to comply with the U.S. Environmental
Protection Agency ("US EPA") and NCDENR guidance for Ris. The QAPP documents the
procedures to be used to ensure that the work performed is of high quality.
2-1
S:\1354\PROJECT\l 997\97-l 75A AquAir 11\Rl Report\Rl Chapt 2 -02.doc
RI REPORT -CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
2.2.2 Site Health and Safety Plan
October 2001
S&ME Project No. 1354-97-175 A
The Site-Specific Health and Safety Plan provided a description of the known existing Site
conditions as they could potentially affect health and safety; described what activities would be
taldng place at the Site as part of the project; reiterated health and safety requirements; described
levels of personal protective equipment ("PPE") that may have been required and the criteria for
such protection; and provided contingency planning for Site communication, emergency
equipment, and emergency planning. In addition, the plan provided mechanisms for amending the
plan and for assuring that project personnel had read the plan and had met its health and safety
requirements such as medical surveillance, respirator fit testing, and training.
2.2.3 Data Management Plan
The data management procedures for the RI were designed to control, inventory, and track data and
documents. After data were generated by field and laboratory operations, the data were handled to
maintain integrity, the integrity of subsequent reports, and for future enforcement or legal
proceedings.
2.2.4 Sampling and Analysis Plan
This document, together with the QAPP, was prepared to comply with the US BP A and NCDENR
guidance for Rls. The procedures contained in this plan are Site specific and are designed to allow
the collection of representative samples for chemical analysis of organic compounds. The
procedures also address the collection of soil and water samples for field screening. The sample-
collection procedures in the plan are intended to be in accordance with applicable federal and state
requirements.
2-2
S:\1354\PROJECT\l 997\97-l 75A AquAir 11\RI Report\RI Chapt 2 -02.doc
RI REPORT-CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
2.3 SITE MAPS
October 2001
S&ME Project No. 1354-97-175 A
Various Site maps have been developed for the RI Report. Most maps were designed on three
basic layouts. The first layout is a 1-inch = 200-feet scale (1: 1,440 scale) map of the former
Facility extending eastward 1,500 feet. The other maps are based either on the USGS 7.5 Minute
topographic quadrangle maps of the area, or maps and aerial photographs from the Mecklenburg
County Geographic Information System ("GIS") database showing the Site and surrounding
environs. Site maps are gee-referenced and licensed North Carolina land surveyors have
surveyed well locations.
2.4 RI REPORT APPENDICES ORGANIZATION
A significant amount of RI data is contained in the appendices of this Report. Data include
sample analyses of multiple samples of solid and liquid media, hydro geologic characterization,
testing, and evaluations, and field water-quality and hydrogeologic data. Table 2-1 presents a
listing of the contents of the appendices.
2.5 WELL INVENTORY
S&ME performed a well survey of the area in March 1999. No private potable-water supply wells
were found within 2,500 feet of the Site. All residences and businesses appear to be connected to
the Charlotte/Mecklenburg County Utility Department ("CMUD") municipal water supply.
2.6 SAMPLE CHEMICAL ANALYSES AND DATA VALIDATION
Sample chemical analysis and data validation were performed in accordance with the SAP and the
QAPP. Samples were primarily analyzed for VOCs and SVOCs. Some samples were analyzed for
total metals, and some soil samples were analyzed for Toxicity Characteristic Leaching Procedure
("TCLP").
2-3
S:\l 354\PROJECT\1997\97-17 SA AquAir 11\RI Report\RI Chapt 2 -OZ.doc
Table 2-1
SUMMARY OF RI REPORT APPENDICES
PHASE II REMEDIAL INVESTIGATION
AQUAIR SITE, CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175A
Sample Location Sample Number Matrix Comments
APPENDIX VOLUME II
1 ATB-03 1 ATB-03-GWOl Groundwater Bedrock Aquifer Characterization
2 ATB-03-GW51 Groundwater Duplicate of ATB-03-GWOl
3 ATB-03-GW02 Groundwater Bedrock Aquifer Characterization
4 ATB-03-GW03 Groundwater Bedrock Aquifer Characterization
5 ATB-03-GW04 Groundwater Bedrock Aquifer Characterization
1 ATB-04 6 ATB-04-GWOl Groundwater Bedrock Aquifer Characterization
7 ATB-04-GW02 Groundwater Bedrock Aquifer Characterization
8 ATB-04-GW03 Groundwater Bedrock Aquifer Characterization
9 ATB-04-GW04 Groundwater Bedrock Aquifer Characterization
10 ATB-04-GW54 Groundwater Duplicate of ATB-04-GW04
1 ATB-01 11 ATB-01-GWOl Groundwater Bedrock Aquifer Characterization
12 ATB-01-GW02 Groundwater Bedrock Aquifer Characterization
13 ATB-01-GW03 Groundwater Bedrock Aquifer Characterization
14 ATB-01-GW04 Groundwater Bedrock Aquifer Characterization
15 ATB-01-GW04 Groundwater Bedrock Aquifer Characterization
16 ATB-01-GW54 Groundwater Duplicate of ATB-01-GW04
1 ATB-02 17 ATB-02-GWOl Groundwater Bedrock Aquifer Characterization
18 ATB-02-GW02 Groundwater Bedrock Aquifer Characterization
19 ATB-02-GW03 Groundwater Bedrock Aquifer Characterization
20 ATB-02-GW53 Groundwater Duplicate of ATB-02-GW03
21 ATB-02-GW04 Groundwater Bedrock Aquifer Characterization
22 ATB-02-GW05 Groundwater Bedrock Aquifer Characterization
23 Field Blank QA/QC Sample
24 Equipment Blank QA/QC Sample
APPENDIX VOLUME III
1 MW-4 25 MW-4 Groundwater Shallow Aquifer Characterization
2 MW-8 26 MW-8 Groundwater Shallow Aquifer Characterization
3 DW-1 27 DW-1 Groundwater Bedrock Aquifer Characterization
4 MW-6 28 MW-6 Groundwater Shallow Aquifer Characterization
5 DW-3 29 DW-3 Groundwater Bedrock Aquifer Characterization
6 MW-9 30 MW-9 Groundwater Shallow Aquifer Characterization
7 DW-2 31 DW-2 Groundwater Bedrock Aquifer Characterization
8 MW-2 32 MW-2 Groundwater Shallow Aquifer Characterization
9 DW-4 33 DW-4 Groundwater Bedrock Aquifer Characterization
S:\l 354\Project\97-175A \RI Report\Tables\Appendices List-0 l .xls\Sheetl Page 1 of 6
Table 2-1
SUMMARY OF RI REPORT APPENDICES
PHASE II REMEDIAL INVESTIGATION
AQUAIR SITE, CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175A
Sample Location Sample Number Matrix Comments
34 Equipment Blank QA/QC Sample
10 MW-5 35 MW-5 Groundwater Shallow Aquifer Characterization
11 MW-3 36 MW-3 Groundwater Shallow Aquifer Characterization
12 MW-1 37 MW-1 Groundwater Shallow Aquifer Characterization
13 ATB-07 38 ATB-07-GWOl Groundwater Bedrock Aquifer Characterization
14 ESW-01 39 ESW-01 Groundwater Bedrock Aquifer Characterization
15 AMW-106 40 AMW-106 Groundwater Shallow Aquifer Characterization
16 AMW-103 41 AMW-103 Groundwater Shallow Aquifer Characterization
17 AMW-104 42 AMW-104 Groundwater Shallow Aquifer Characterization
18 AMW-104 43 AMW-104 Groundwater Shallow Aquifer Characterization
19 AMW-404 44 AMW-404 Groundwater Bedrock Aquifer Characterization
45 Trip Blank QA/QC Sample
20 AMW-105 46 AMW-105 Groundwater Shallow Aquifer Characterization
47 Trip Blank QA/QC Sample
APPENDIX VOLUMES IV AND V
1 ATB-12 1 ATB-12-1 Groundwater Bedrock Aquifer Characterization
2 ATB-12-2 Groundwater Bedrock Aquifer Characterization
3 Trip Blank QA/QC Sample
4 ATB-12-3 Groundwater Bedrock Aquifer Characterization
5 ATB-12-4 Groundwater Bedrock Aquifer Characterization
6 ATB-12-5 Groundwater Bedrock Aquifer Characterization
7 ATB-12-6 Groundwater Bedrock Aquifer Characterization
8 ATB-12-7 Groundwater Bedrock Aquifer Characterization
9 Trip Blank QA/QC Sample
2 AMW-101 10 AMW-101 Groundwater Shallow Aquifer Characterization
3 AMW-102 11 AMW-102-2 Groundwater Shallow Aquifer Characterization
12 Trip Blank QA/QC Sample
4 ATB-11 13 ATB-11-1 Groundwater Bedrock Aquifer Characterization
14 ATB-11-2 Groundwater Bedrock Aquifer Characterization
15 Trip Blank QA/QC Sample
ATB-11 16 ATB-11-3 Groundwater Bedrock Aquifer Characterization
17 Trip Blank QA/QC Sample
18 ATB-11-4 Groundwater Bedrock Aquifer Characterization
19 ATB-11-5 Groundwater Bedrock Aquifer Characterization
5 AAH-02 20 AAH-02-11 Groundwater Shallow Aquifer Characterization
6 AAH-04 21 AAH-04-11 Groundwater Shallow Aquifer Characterization
S:\1354\Project\97-l 75A\RI Report\Tables\Appendices List-0 l .xls\Sheetl Page 2 of 6
Table 2-1
SUMMARY OF RI REPORT APPENDICES
PHASE II REMEDIAL INVESTIGATION
AQUAIR SITE, CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175A
Sample Location Sample Number Matrix Comments
7 AAH-05 22 AAH-05-11 Groundwater Shallow Aquifer Characterization
23 Trip Blank QA/QC Sample
8 ATB-9 24 ATB-9-1 Groundwater Bedrock Aquifer Characterization
25 ATB-9-2 Groundwater Bedrock Aquifer Characterization
26 ATB-9-3 Groundwater Bedrock Aquifer Characterization
27 Trip Blank QA/QC Sample
ATB-9 28 ATB-9-4 Groundwater Bedrock Aquifer Characterization
29 ATB-9-5 Groundwater Bedrock Aquifer Characterization
30 Trip Blank QA/QC Sample
9 ATB-06 31 ATB-06-1 Groundwater Bedrock Aquifer Characterization
32 Trip Blank QA/QC Sample
ATB-06 33 ATB-06-02 Groundwater Bedrock Aquifer Characterization
34 ATB-06-03 Groundwater Bedrock Aquifer Characterization
35 ATB-06-04 Groundwater Bedrock Aquifer Characterization
36 Trip Blank QA/QC Sample
APPENDIX VOLUME VI
1 ATB-6 1 ATB-6-5 Groundwater Bedrock Aquifer Characterization
2 ATB-6-6 Groundwater Bedrock Aquifer Characterization
3 ATB-6-7 Groundwater Bedrock Aquifer Characterization
4 Trip Blank QA/QC Sample
5 EB-ATB-6 QA/QC Sample -Equipment Blan
Roll-off Soil 6 R0-1 Soil IDW Waste Characterization
Roll-off Soil 7 R0-1 Soil IDW Waste Characterization
8 Trip Blank QA/QC
APPENDIX VOLUME VII
1 AMW-502 1 AMW-502 Groundwater Bedrock Aquifer Characterization
2 AMW-402 2 AMW-402 Groundwater Bedrock Aquifer Characterization
3 Trip Blank QA/QC
3 ATB-6 4 ATB-6-8 Groundwater Bedrock Aquifer Characterization
5 ATB-6-9 Groundwater Bedrock Aquifer Characterization
6 ATB-6-10 Groundwater Bedrock Aquifer Characterization
7 Trip Blank QA/QC
4 ATB-6 8 ATB-6-10 Groundwater Bedrock Aquifer Characterization
9 ATB-6-2 Groundwater Bedrock Aquifer Characterization
10 ATB-6-3 Groundwater Bedrock Aquifer Characterization
S:\l 354\Project\97-l 75A \RI Report\Tables\Appendices List-0 I .xls\Sheetl Page 3 of 6
Table 2-1
SUMMARY OF RI REPORT APPENDICES
PHASE II REMEDIAL INVESTIGATION
AQUAIR SITE, CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175A
Sample Location Sample Number Matrix Comments
11 Trip Blank QA/QC
12 FB-ATB-8 QA/QC -Field Blank
5 ATB-8 13 ATB-8-4 Groundwater Bedrock Aquifer Characterization
14 ATB-8-5 Groundwater Bedrock Aquifer Characterization
15 ATB-8-6 Groundwater Bedrock Aquifer Characterization
16 Trip Blank QA/QC
6 ATB-10 17 ATB-10-1 Groundwater Bedrock Aquifer Characterization
18 ATB-10-2 Groundwater Bedrock Aquifer Characterization
19 Trip Blank QA/QC
APPENDIX VOLUME VIII
1 ATB-10 1 ATB-10-3 Groundwater Bedrock Aquifer Characterization
2 ATB-10-4 Groundwater Bedrock Aquifer Characterization
3 ATB-10-5 Groundwater Bedrock Aquifer Characterization
4 Trip Blank QA/QC
2 ATB-07 5 ATB-07-01 Groundwater Bedrock Aquifer Characterization
6 Trip Blank QA/QC
ATB-07 7 ATB-07-02 Groundwater Bedrock Aquifer Characterization
8 ATB-07-03 Groundwater Bedrock Aquifer Characterization
9 ATB-07-04 Groundwater Bedrock Aquifer Characterization
10 ATB-07-05 Groundwater Bedrock Aquifer Characterization
11 Trip Blank QA/QC
3 AMW-109 12 AMW-109-0700 Groundwater Bedrock Aquifer Characterization
4 ACS 13 ACS 11-15 Concrete Waste Characterization
14 ACS 9-10 Concrete Waste Characterization
15 ACS 1-5 Concrete Waste Characterization
16 ACS 16-19 Concrete Waste Characterization
5 AMW-411 17 AMW-411 Groundwater Bedrock Aquifer Characterization
6 AMW-410 18 AMW-410 Groundwater Bedrock Aquifer Characterization
7 AMW-612 19 AMW-612 Groundwater Bedrock Aquifer Characterization
8 AMW-608 20 AMW-608 Groundwater Bedrock Aquifer Characterization
9 AMW-607 21 AMW-607 Groundwater Bedrock Aquifer Characterization
10 AMW-509 22 AMW-509 Groundwater Bedrock Aquifer Characterization
APPENDIX VOLUME IX
1 APT-1 1 APT-1-01 Groundwater Bedrock Aquifer Pump Test
2 APT-1-02 Groundwater Bedrock Aquifer Pump Test
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Table 2-1
SUMMARY OF RI REPORT APPENDICES
PHASE II REMEDIAL INVESTIGATION
AQUAIR SITE, CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175A
Sample Location Sample Number Matrix Comments
3 APT-1-03 Groundwater Bedrock Aquifer Pump Test
4 APT-1-04 Groundwater Bedrock Aquifer Pump Test
5 APT-1-05 Groundwater Bedrock Aquifer Pump Test
2 ATB-01 6 ATB-01-200 Groundwater Bedrock Aquifer Characterization
7 ATB-01-109 Groundwater Bedrock Aquifer Characterization
8 ATB-01-83 Groundwater Bedrock Aquifer Characterization
9 ATB-01-58 Groundwater Bedrock Aquifer Characterization
10 ATB-01-42 Groundwater Bedrock Aquifer Characterization
11 Trip Blank QA/QC
12 Equipment Blank QA/QC
3 SW-1 13 SW-1 Surface Water Surface Water Characterization
14 Trip Blank QA/QC
4 APH-04 15 APH-04-GW-O 1 Groundwater Shallow Aquifer Characterization
16 Trip Blank QA/QC
5 ESW-1 17 ESW-1 Groundwater Bedrock Aquifer Characterization
6 MW-3 18 MW-3 Groundwater Shallow Aquifer Characterization
7 MW-6 19 MW-6 Groundwater Shallow Aquifer Characterization
8 MW-9 20 MW-9 Groundwater Shallow Aquifer Characterization
9 MW-10 21 MW-10 Groundwater Shallow Aquifer Characterization
10 AMW-101 22 AMW-101 Groundwater Shallow Aquifer Characterization
23 Trip Blank QA/QC
11 ATB-01 24 ATB-01-200 Groundwater Bedrock Aquifer Characterization
25 ATB-01-109 Groundwater Bedrock Aquifer Characterization
26 ATB-01-83 Groundwater Bedrock Aquifer Characterization
27 ATB-01-58 Groundwater Bedrock Aquifer Characterization
28 ATB-01-42 Groundwater Bedrock Aquifer Characterization
29 Trip Blank QA/QC
30 Equipment Blank QA/QC
12 SW-1 31 SW-1 Surface Water Surface Water Characterization
13 SW-2 32 SW-2 Surface Water Surface Water Characterization
14 SW-3 33 SW-3 Surface Water Surface Water Characterization
15 ATW-202 34 ATW-202 Groundwater Shallow Aquifer Characterization
16 ATW-203 35 ATW-203 Groundwater Shallow Aquifer Characterization
17 AMW-101 36 AMW-101 Groundwater Shallow Aquifer Characterization
18 APH-03 37 APH-03-S06-02 Soil Shallow Soil Characterization
19 SED-1 38 SED-1 Sediment Sediment Characterization
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Table 2-1
SUMMARY OF RI REPORT APPENDICES
PHASE II REMEDIAL INVESTIGATION
AQUAIR SITE, CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175A
Sample Location Sample Number Matrix Comments
20 SED-2 39 SED-2 Sediment Sediment Characterization
21 SED-3 40 SED-3 Sediment Sediment Characterization
22 TCLP-6 41 TCLP-6 Soil Shallow Soil Characterization
23 TCLP-2 42 TCLP-2 Soil Shallow Soil Characterization
24 SED-4 43 SED-4 Sediment Sediment Characterization
25 SED-5 44 SED-5 Sediment Sediment Characterization
26 SED-6 45 SED-6 Sediment Sediment Characterization
27 SED-7 46 SED-7 Sediment Sediment Characterization
47 SED-7 (Dupe) Sediment Duplicate of SED-7
28 TCLP-1 48 TCLP-1 Leachate Concrete Waste Characterization
29 TCLP-2 49 TCLP-2 Leachate Concrete Waste Characterization
30 TCLP-3 50 TCLP-3 Leachate Concrete Waste Characterization
31 TCLP-4 51 TCLP-4 Leachate Concrete Waste Characterization
32 TCLP-5 52 TCLP-5 Leachate Concrete Waste Characterization
33 TCLP-6 53 TCLP-6 Leachate Concrete Waste Characterization
APPENDIX VOLUME X
Field Notes
Photographs
Well Logs
Well Construction Diagrams
Borehole Geophysical Logs
Groundwater Level Measurements
Pilot Testing
Soil Sampe Collection
Groundwater Flow Measurements
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RI REPORT -CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
2.6.1 Screening Analyses
October 2001
S&ME Project No. 1354-97-175 A
Field-screening analyses were performed on selected soil and groundwater samples and included the
measurement of organic vapor using a Foxboro Organic Vapor Analyzer ("OVA") or Toxic Vapor
Analyzer ("TV A") using a headspace method. The headspace method involves containerizing
samples by partially filling the sample container with sample, allowing time for chemical
compounds to volatilize, and then reading organic vapors contained in the "headspace" of the
sample container.
In addition, groundwater samples were analyzed in the field with test kits for a suite of inorganic
parameters to evaluate natural attenuation. The inorganic parameters measured include dissolved
oxygen, ferrous iron, chloride, sulfate, oxygen/reduction potential, and nitrate.
2.6.2 VOC, SVOC, and Metals Analyses
Analysis of soil and water samples for VOCs and SVOCs by US EPA Methods 8260 and 8270,
respectively, with identification/quantification of tentatively identified compounds ("TICs"), was
performed by the Pace Analytical Services, Inc. (Pace") of Huntersville, North Carolina; Pace also
performed all of the metals analyses. S&ME's mobile laboratory located in Savannah, Georgia
performed some Method 8260 VOC analyses.
2.7 SITE INVESTIGATIONS
This section describes the activities that have occurred at the Site during the RI. In addition,
sampling activities associated with IRMs and other activities are also discussed.
2.7.1 Overview
2-10
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AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Site investigations have been ongoing since 1997 with the bulk of the work conducted in 1998
and 1999. Site investigations include shallow on-Site soil and sediment sampling, limited on-
Site Geoprobe™ assessments involving the collection of soil and groundwater samples, on-Site
surface water and sediment sampling in the Unnamed Creek, and on-Site assessment of the
Shallow and Bedrock aquifers including geologic test drilling, well installation, groundwater
sampling, and hydrogeologic data collection.
2.7.2 Shallow Soil and Sediment Sampling
Shallow soils and sediments were sampled on several occasions. Samples were collected on at
least one occasion at the following locations:
• Sediments samples were collected from the Unnamed Creek and from
drainageways leading from the former Facility;
• Shallow soils were sampled around the former septic tank, and from other
areas around the former Facility where releases were suspected; and
• The concrete floor slab and vanadium pentoxide pellets were sampled for
waste characterization.
2. 7 .3 Geoprobe™ Sampling
Limited Geoprobe™ sampling was performed at the Site during the RI primarily to collect soil
samples.
2.7.4 Surface-Water and Sediment Sampling
Three pairs of surface-water and sediment samples were collected from the Unnamed Creek on
two occasions.
2-11
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RI REPORT -CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
2. 7 .5 Shallow Aquifer Assessment
The Shallow Aquifer assessment included:
October 2001
S&ME Project No. 1354-97-175 A
• Drilling nine geologic test boreholes with hollow-stemmed augers;
• Physical testing of selected soil samples;
• Installation and development of eight two-inch-diameter, PVC monitoring
wells;
• Jn situ hydraulic conductivity tests;
• Jn situ measurement of groundwater flow;
• Measurement of static water levels;
• Collection of groundwater samples for chemical analysis on several
occasions; and
• Measurement of field water-quality parameters during sample collection.
2.7.5.1 Geologic Test Drilling
Nine geologic test boreholes (AMW-102 through AMW-110) were drilled during the period of
November 1998 to February 1999. Auger refusal was encountered at all test boreholes at depths
ranging from 18.0 feet below land surface ("BLS") to 26.5 feet BLS.
Test drilling was performed with 4.25-inch-diameter, hollow-stemmed augers ("HSAs"). Soil
sampling was performed with a CME Continuous-Tube Sampler ("CTSs"). All soil samples
were screened in the field with either a Foxboro TV A or OVA. Geologic logs are contained in
Appendix II.
2.7.5.2 Monitoring Well Installation
2-12
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October 2001
S&ME Project No. 1354-97-175 A
Nine wells (AMW-102 through AMW-110) were installed to evaluate groundwater quality in the
Shallow Aquifer.
2. 7.5.3 In Situ Hydraulic Conductivity Testing
In Situ hydraulic conductivity tests (slug tests) were performed in Shallow Aquifer monitoring
wells AMW-102 through AMW-106. A 14-psi pressure transducer and a Hermit 1000
datalogger, both manufactured by InSitu, Inc., were used to record test data. Test data was
analyzed according to the Bouwer and Rice method for analyzing slug tests in unconfined
aquifers. Test data and analyses are contained in Appendix III.
2.7.5.4 In Situ Groundwater Flow Measurements
In Situ groundwater flow measurements were performed in six new and existing Shallow Aquifer
monitoring wells. Groundwater flow was measured using with a Flow Monitor Model 40 system
manufactured by KV A Analytical ("KV A") of Falmouth, Massachusetts.
2.7.5.5 Well Development and Sampling
Shallow Aquifer monitoring wells have been sampled on at least one occasion. Monitoring wells
were developed after installation and prior to the first sampling event. Well development
consisted of surging and over pumping. During development and purging, field water-quality
parameters (pH, specific conductivity, and temperature) were measured.
Prior to sampling, wells were purged of at least three well volumes where field water-quality
parameters had stabilized, or until the well was dry. Wells were sampled with disposable
polyethylene hailers. Purged groundwater was containerized and temporarily stored in an on-
Site tank prior to off Site disposal.
2-13
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RI REPORT -CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
2.7.6 Bedrock Aquifer Assessment
The Bedrock Aquifer assessment included:
October 2001
S&ME Project No. 1354-97-175 A
• Drilling seven geologic test boreholes using air rotary methods;
• Geophysical logging and borehole inspection using a down-hole video
camera;
• In situ discrete-interval hydraulic conductivity testing usmg dual-packer
system;
• In situ measurement of groundwater flow;
• Measurement of static water levels;
• Aquifer testing during startup ofIRMs;
• Collection of discrete-interval and composite-borehole groundwater samples
for chemical analysis; and
• Measurement of field water-quality parameters during sample collection.
2.7.6.1 Geologic Test Drilling
Seven test boreholes (ATB-06 through ATB-12) were drilled during October and November
1998 into bedrock rock by McCall Brothers, Inc ('McCall Brothers") of Charlotte, North
Carolina using air-rotary drilling methods. Nominal six-inch-diameter, steel surface casing was
grouted into bedrock prior to advancing the borehole. Steel casing was set approximately three
to five feet into competent rock.
All boreholes were advanced to a depth of between 150 and 250 feet below land surface
("BLS"). Monitoring wells were subsequently installed in all bedrock test boreholes except
ATB-06 to monitor the fracture zone with either the highest groundwater flow, or the most
heavily impacted groundwater. A twin well assembly was installed in existing Test Borehole
ATB-03 due to the presence of several high-yield fracture zones with impacted groundwater.
2-14
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RI REPORT -CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
2.7.6.2 Test Borehole Development
October 2001
S&ME Project No. 1354-97-175 A
McCall Brothers developed bedrock test boreholes by overpumping until the well discharge
became Clear. Purged water was containerized and was stored temporarily on Site prior to off-
Site disposal.
2.7.6.3 Geophysical Logging and Borehole Video Inspection
S&ME contracted Environmental and Geologic Information Systems, Inc ("EGIS") of Raleigh,
North Carolina to perform geophysical logging and borehole video-camera inspection.
Geophysical logging and video inspection were performed in all bedrock test boreholes to
identify fracture zones and bedrock hydrogeologic characteristics.
2. 7 .6.4 Discrete-Interval Hydraulic Testing and Sampling
Discrete-interval hydraulic testing was performed in the bedrock boreholes using an inflatable,
dual-packer assembly; the packer string was either Schedule-80 galvanized steel or 2-inch
polyvinylchloride (PVC) well riser with a 10-foot galvanized-steel screen section between the
packers. Fracture zones were chosen based on the geophysical logging and borehole video
inspection. Four to ten fracture zones were tested in each bedrock borehole.
2. 7 .6.5 Jn Situ Groundwater Flow Measurements
Jn Situ groundwater flow measurements were performed in all Bedrock Aquifer test boreholes
during November and December 1998. Individual fractures were chosen based on the
geophysical logging, borehole video inspection, and the results of discrete-interval hydraulic
2-15
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RI REPORT -CHAPTER 2
AQUAIR REMEDIAL INVESTIGATION
October 200 I
S&ME Project No. 1354-97-175 A
testing. Groundwater flow was measured usmg with a Flow Monitor Model 40 system
manufactured by KV A.
2.8 INTERIM REMEDIAL MEASURES
Interim Remedial Measures ("IRMs") have been performed at the Site and include:
• Demolition of the shells for the former production and laboratory
buildings in May 1999;
• Removal and disposal of the former septic tank, including contained
fluids, and drain line on March 13, 2000;
• Demolition and removal of the floor slab and underlying soil of the former
production building in May and July 2000;
• Removal of vanadium-pentoxide pellets from areas east, north, and
northwest of the former Facility in February 1999, and;
• Installation and operation of a Bedrock Aquifer groundwater recovery and
treatment system ("IRM GWR System") beginning in November 2000.
2-16
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RI REPORT -CHAPTER 3
AQUAIR REMEDIAL INVESTIGATION
3.0 AREA FEATURES
October 2001
S&ME Project No. 1354-97-175 A
The general features of the area surrounding the Site are discussed in this section. These features
include land use and natural resources.
3.1 LAND USE
Land use in the area of the Site is a mix of vacant, industrial, commercial, and residential (Figures 1-
3 and 1-5). Industrial operations border the Site on the north across Westinghouse Boulevard, east,
and west. Industries adjacent to the Site include Valmet Industries, Air Products, and Ashland
Chemical. Converse Shoes is located east of the Site across Goodrich Drive.
Vacant properties are located southwest, northwest, and east of the Site. The properties to the
northwest and southwest are heavily wooded (Figure 1-3). The vacant properties to the east have
been cleared.
A residential subdivision of single-family homes is located south of the Site. A condominium or
apartment complex is located southeast of the Site (Figure 1-3). Development of the these
residential communities began in 1998.
3.2 NATURAL RESOURCES
The area around the Site is mostly industrial and commercial. Westinghouse Boulevard is
completely developed from west of the Site to the other side of I-77, which is located
approximately three miles to the east. Undeveloped industrial/commercial property is still
available west of the Site.
The area south of the Site is transforming from undeveloped!rural property to a variety of
residential uses as the Charlotte metropolitan area grows. The Catawba River is located west of
3-1
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RI REPORT -CHAPTER 3
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
the Site and is a major recreational venue. Carowinds amusement park is located about four
miles southeast of the Site.
3.3 CLIMATE
The Site is located in Mecklenburg County, which lies in the Piedmont Physiographic Province of
North Carolina. The average annual temperature is approximately 60° Fahrenheit (F) with
average monthly temperatures ranging from 39.5 °F in January to 78.6 °F in July (Southeast
Regional Climate Center, Climatological Norms: 1961-1990, Charlotte, NC).
Humidity is typically elevated from late spring to early fall. Major winter storms generally produce
sleet or freezing rain rather than snow. Storms typically move from southwest to northeast along
advancing frontal boundaries moving to the southeast.
Average annual precipitation is approximately 43 inches. Precipitation is well distributed
throughout the year with average monthly precipitation ranging from a minimum of 2.67 inches
in April to a maximum of 4.43 inches in March. However, below normal rainfall has occurred in
the area since 1996. The Unnamed Creek at the Site had near continuous base flow until early 1999
when the rainfall deficit reduced aquifer levels to the point where groundwater discharge was not
sufficient to maintain flow.
3-2
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RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
4.0 REVIEW OF EXISTING DATA
Environmental assessment activities have been performed intermittently at the Site since 1985.
Site records do not indicate any quantitative environmental investigations between 1965 when
the Facility was initially constructed and 1990 when limited soil sample collection and analysis
was performed.
4.1 PRELIMINARY ASSESSMENT -JUNE 1985
In June 1985, the North Carolina Department of Human Resources (''NCDHR"), Division of
Health Services ("DHS") performed a Preliminary Assessment ("PA") at the Site. The PA
consisted of a review of the Facility's waste-disposal methods. Potentially contaminated surface
soils were observed during the PA and the NCDHR recommended that a medium priority
inspection be performed at the Site.
4.2 PHASE I SUPPLEMENTAL SITE INVESTIGATION -OCTOBER 1990
Because of the June 1985 PA, the North Carolina Department of Environment and Natural
Resources (''NCDEHNR"), the successor agency to NCDHR, contracted Greenhome & O'Mara,
Inc. ("G&O") to conduct a Phase I Supplemental Site Investigation ("Phase I SSI") at the Site on
October 1, 1990. The Phase I SSI consisted of a detailed inspection of the Facility.
The results of the SSI included: (1) the Facility was observed to be abandoned; (2) the roof of the
facility building had been removed exposing contaminated soil and cement; (3) substances
containing hazardous materials were stored in the manufacturing building; ( 4) a trench traversed
the building and the trench led to a discharge point outside the building where dead vegetation
was observed; and (5) stained soil was observed at a sump pit used to collect spilled materials
from the manufacturing floor.
4-1
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RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
G&O recommended that a Phase II Screening Site Investigation be performed with appropriate
sampling. Upon review of the Phase I SSI, the NCDEHNR concluded that the Site posed a
"potential threat to the surrounding environment".
4.3 PHASE II SCREENING SITE INVESTIGATION -OCTOBER 1990
On October 25-26, 1990, G&O collected 10 samples for chemical analysis to characterize
possible environmental impacts at the Site as part of a Phase II Screening Site Investigation
("Phase II Screening SI"). The samples consisted of: (1) two groundwater samples (up-gradient
and down-gradient); (2) four soil samples (one background, one at the trench discharge, one at
the sump pit, and one at the hazardous waste storage area); and (3) two sediment and surface-
water samples from the Unnamed Creek (up-gradient and down-gradient).
These samples were analyzed for volatile organic compounds ("VOCs"), semi-volatile organic
compounds ("SVOCs"), pesticides/PCBs, and metals. The sampling locations are shown on
Figure 4-1. Sample analytical results are presented in Tables 4-1, 4-2, and 4-3.
4.3.1 Soil and Sediment Sample Analytical Results
VOCs or SVOCs were not detected in the background soil sample (SS-01). Metals were
detected in the background soil sample; however, all levels were within the range of naturally
occurring concentrations with the exception of cadmium.
The composite soil sample (SS-02) collected from where the trench discharged contained
detectable concentrations of three voes that included chloroform, carbon tetrachloride, and
tetrachloroethene ("PCE"). VOC concentrations ranged from 180 micrograms per kilogram
("µg/kg") to 500 µg/kg. SVOCs were not detected.
4-2
S:\l 354\PROJEC1\l 997\97-l 75A AquAir II\RI Report\Rl Chapt 4 -02.doc
Legend
CMUD A Charlotte!Mecklenburg Utility Department + Surface Water and Sediment Sampling Location
~ Soil Sampling Location
• Groundwater Sampling Location Samples Collected November 1990
SCALE: l" = 600'
CHECKED BY: CTL
DRAWN BY: JLC
DATE: 09117101
•s&ME • Eth·lf\O/"Jl.IEH1.e.~ ·:.;E::.":(C; • ::M·:'.:1t-.E~RU·.(: · -:::-,w.•::
GREENHORNE & O'MERA SAMPLING POINTS
AQUAIR REMEDIAL INVESTIGATION)
CHARLOTTE, MECKLENBURG COUNTY, NC
JOB NO. 1354-97-175 A
FIGURE NO.
4-1
Sample ID SW-01 SW-02
Media (UpStSW) (DnStSW)
Date Sampled 10/26/199) I 0/25/1990
Units µg/L µg/L
Methylene Chloride BQL BQL
1,1 Dichloroethene BQL BQL
Chloroform BQL BQL
1,2 Dichloroethane BQL BQL
1,1,1 Trichloroethane BQL BQL
Carbon Tetrachloride BQL BQL
Trichloroethene BQL BQL
4-Methyl-2-pentanone BQL SJ
Tetrachloroethene BQL BQL
Chlorobenzene BQL BQL
Total VOCs 0 8
Table 4-1
GREENHORNE & O'MARA HISTORICAL voe DATA
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-175 A
GW-02 GW-03 SED-01 SED-02 SS-01
(On-SitGW) (DGGW) (UpSt Sed) (DnSt Sed) (BG Soil)
10/25/1990 10/26/1990 10125/1990 10/25/1990 10/25/1990
µg/L µg/L µg/kg µg/kg µg/kg
BQL 400J BQL BQL BQL
92 BQL BQL BQL BQL
15 16,000 BQL BQL BQL
BQL 740 BQL BQL BQL
170 BQL BQL BQL BQL
4J 17,000 BQL BQL BQL
93 BQL BQL BQL BQL
BQL BQL BQL BQL BQL
43 2,800 BQL BQL BQL
BQL 600 BQL BQL BQL
417 37,540 0 0 0
Notes: BQL -Below Laboratory Quantitation Limits.
J -Estimated Value.
D -Constituent was Detected using a Second Dilution.
µg/L -Micrograms per Liter.
µglkg -Micrograms per kilogram.
S:\1354\Project\!997\97175A\O&G 4-1to4-3.xls Page 1
SS-02 SS-03 SS-04
(Trench Q Soil) (Sump Pit Soil) (Haz Waste Soil)
10/25/1990 10/25/1990 10/25/1990
µg/kg µg/kg µg/kg
BQL BQL BQL
BQL BQL BQL
500 BQL BQL
BQL BQL BQL
BQL 36,000 BQL
180 29,000 BQL
BQL 9,500 6J
BQL BQL BQL
180 150,000 21
BQL 10,000 BQL
860 234,500 27
Sample ID SW-01
Media (UpSt SW)
Date Sampled 10/26/1990
Units µg/L
Phenol BQL
1,4 Dichlorobenzene BQL
Hexachloroethane BQL
Benzoic acid BQL
1,2,4 Trichlorobenzene BQL
Hexachlorobutadiene BQL
Di-n-butylphthalate BQL
Butylbenzylphthalate BQL
Bis (2-ethylhexyl) phthalate BQL
Total SVOCs 0
Table 4-2
GREENHORNE & O'MARA HISTORICAL SVOC DATA
AQUAIR REMEDIAL INVESTIGATION
SW-02
(DnStSW)
10/25/1990
µg/L
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
BQL
0
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-l 75A
GW-02 GW-03 SED..01 SED..02 SS..01
(On-Sit GW) (DGGW) (UpSt Sed) (DnSt Sed) (BG Soil)
10/25/1990 1012611990 10/25/1990 10/25/1990 10/25/1990
µg/L µg/L µg/kg µg/kg µg/kg
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL SJ BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL 7J 160J BQL BQL
0 15 160 0 0
Notes: BQL -Below Laboratory Quantitation Limits.
J -Estimated Value.
D -Constituent was Detected using a Second Dilution.
µg/L -Micrograms per Liter.
µg/kg -Micrograms per kilogram.
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SS..02 SS-03 SS..04
(Trench Q Soil) (Sump Pit Soil) (Haz Waste Soil)
10/25/1990 10/25/1990 10/25/1990
µg/kg µg/kg µg/kg
BQL 2,300/l ,400JD BQL
BQL 1,IOOUD BQL
BQL 200J/UD BQL
BQL 360J/UD BQL
BQL 46,000E/59,000D BQL
BQL 250J/UD BQL
BQL 290J/UD BQL
BQL 300J/UD BQL
860 4,500/2,300JD 98J
860 68,300 98
Sample ID SW-01 SW-02
Media (UpSt SW) (DnSt SW)
Date Sampled 10/26/199) 10/25/1990
Units µg/L µg/L
ALUMINUM 2,720 4,060
ANTIMONY BQL BQL
BARIUM BQL BQL
BERYLLIUM BQL BQL
CADMIUM BQL BQL
CALCIUM 10,300 BQL
CHROMIUM 10.7 BQL
COBALT BQL BQL
COPPER BQL BQL
IRON 5,080 6,910
LEAD 14.8 3.7
MAGNESIUM 5,150 BQL
MANGANESE 246 128
MERCURY BQL BQL
NICKEL BQL BQL
POTASSIUM BQL BQL
SILVER BQL BQL
SODIUM BQL BQL
VANADIUM BQL BQL
ZINC 1,120 BQL
Table 4-3
GREENHORNE & O'MARA HISTORICAL l\1ET ALS DATA
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. I 354-97-175A
GW-02 GW-03 SED-01 SED-02 SS-01
(On-Sit GW) (DGGW) (UpSt Sed) (DnSt Sed) (BG Soil)
10/25/1990 10/26/1990 10/25/1990 10/25/1990 1012511990
µg/L µg/L µg/kg µg/kg µg/kg
990,000 21,100 12,000 13,600 15,400
67.8 BQL BQL BQL BQL
10,200 641 97.1 299 86.5
30.7 BQL BQL BQL 1.5
246 6.5 3.7 9.4 9
591,000 108,000 4,860 4,400 BQL
1,990 BQL 53.3 106 24.4
820 BQL BQL 42.3 34.3
742 BQL 19.2 10.9 BQL
133,000 26,100 25,200 61,100 53,200
20.8 6.5 18.9 12 20.5
422,000 75,100 2,930 3,650 BQL
22,100 501 647 2,770 2,260
2.6 BQL BQL BQL BQL
306 BQL 26.9 23.7 BQL
111,000 BQL BQL BQL BQL
15.7 BQL BQL BQL BQL
29,300 38,900 BQL BQL BQL
2,200 90.7 192 197 202
4,510 142 286 54.1 29.3
Notes: BQL -Below Laboratory Quantitation Limits.
J -Estimated Value.
µg/L -Micrograms per Liter.
µg/kg -Micrograms per kilogram.
S;ll354\Projectll997197175AIO&G 4-l to 4-3.xls Page I
SS-02 SS-03 SS-04
(Trench Q Soil) (Sump Pit Soil) (Haz Waste Soil)
10/25/1990 10/25/1990 10/25/1990
µg/kg µg/kg µg/kg
14,200 22,900 20,500
BQL 292 BQL
77.8 72.4 66.5
BQL BQL BQL
26 788 11.2
3,600 40,700 2,560
735 18,500 83.3
16 BQL 25.5
175 116 16.9
28,700 39,100 57,200
98.4 2,820 26.60
3,960 3,680 3,410
649 348 1,200
0.63 11.l BQL
21 BQL BQL
BQL 3,760 BQL
BQL BQL BQL
BQL BQL BQL
326 106 366
154 109 65.4
RI REPORT-CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Five VOCs were detected in the sump-pit soil sample (SS-03). The VOCs included 1,1,1-
trichloroethane ("1, 1, 1-TCA"), carbon tetrachloride, trichloroethene ("TCB"), PCB, and
chlorobenzene. voe concentrations ranged from 9,500 µg/kg to 150,000 µg/kg, and total voes
were 234,500 µg/kg.
Nine SVOCs were detected in soil sample SS-03 and included phenol, 1,2-dichlorobenzene,
hexachloroethane, benzoic acid, 1,2,4-trichlorobenzene ("1,2,4-TCB"), hexachlorobutadiene, di-
n-buthylphthalate, butylbenzylphthalate, and bis (2-ethylhexyl) phthalate ("BHPH"). SVOC
concentrations ranged from 250 µg/kg to 59,000 µg/kg, and total SVOCs were 68,300 µg/kg.
Only 5 of the 20 analyzed metals were not detected. Most metals were present at concentrations
greater than background levels including antimony, cadmium, chromium, mercury, and lead.
The soil sample collected in the hazardous waste storage area (SS-04) contained detectable
concentrations of two VOCs, TCB (6 µg/kg) and PCB (21 µg/kg). The only detectable SVOC
was bis (2-ethylhexyl) phthalate (98 µg/kg). Chromium (83 µg/kg), Cadmium (11.2 µg/kg),
Lead (26.6 µg/kg) and Vanadium (366 µg/kg) were reported above the background levels and/or
detection limits.
No VOCs were detected in the upstream sediment sample (SBD-01). The only SVOC detected
was bis (2-ethylhexyl) phthalate (160 µg/kg). Cadmium (3.7 µg/kg) was the only metal detected
"above the naturally occurring concentrations for the region."
No VOCs or SVOCs were detected in the downstream sediment sample (SBD-02). Fourteen of
the 20 analyzed metals were detected. None the detected metals appeared to be significantly
"above naturally occurring concentrations for the region."
4-7
S:\l 354\PROJECT\1997\97-17 SA AquAir JI\Rl Report\Rl Chapt 4 -02.doc
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
4.3.2 Surface and Groundwater Sample Analytical Results
October 2001
S&ME Project No. 1354-97-175 A
No voes or SVOes were detected in the upstream surface water sample (SW-01). In addition,
all detected concentrations of metals were within State mandated "Maximum Permissible
Levels" ("MPLs") "that are believed necessary to protect aquatic life."
The downstream surface water sample (SW-02) contained one voe [ 4-methyl-2-pentanone (8
µg/L)]. SVOCs were not detected. All detected metals concentrations were within State
mandated MPLs that are believed necessary to protect aquatic life.
The on-Site upgradient groundwater sample (GW-02) contained six voes that included 1,1-
dichloroethene ("DeE") (92 µg/L), chloroform (15 µg/L), 1,1,1-TCA (170 µg/L), carbon
tetrachloride (4 µg/L), TCE (93 µg/L), and PeE (43 µg/L). SVOes were not detected. All
analyzed metals were reported above the background concentrations and/or detection limits.
The down-gradient groundwater sample (GW-03) contained six VOes and included methylene
chloride (400 µg/L), chloroform (16,000 µg/L), 1,2-DCA (740 µg/L), carbon tetrachloride
(17,000 µg/L), PeE (2,800 µg/L), and chlorobenzene (600 µg/L)]. Hexachloroethane (8 µg/L)
and bis (2-ethylhexyl) phthalate (7 µg/L) were the only detected SVOes. Eleven of twenty
analyzed metals were reported above the background levels and/or detection limits.
4.4 REMEDIAL SITE EVALUATION AND REMOVAL SITE EVALUATION -
JANUARY 1994
From February 28, 1992 to August 31, 1993, Delta Environmental Consultants, Inc ("Delta")
conducted a Remedial Site Evaluation ("RSE") for SNL to assess environmental conditions. The
RSE included the installation of 10 Type II (MW-1 through MW-10) and 4 Type Ill (DW-1
through DMW-4) monitoring wells, and chemical analysis of groundwater, soil, and sediment
samples. Monitoring well locations were selected based on the results of a February 10-12, 1992
4-8
S:\l 354\PROJECT\J 997\97-l 75A AquAir II\RI Report\Rl Chapt 4 -02.doc
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
soil gas survey performed by Tracer Research Corporation.
locations and monitoring wells are presented on Figure 4-2.
October 2001
S&ME Project No. 1354-97-175 A
Soil and sediment sampling
On March 3, 1992, Delta sampled monitoring wells MW-1 through MW-6.
1992, Delta sampled monitoring wells MW-7 through MW-10 and wells DW
4. The monitoring well groundwater samples were analyzed for VOCs, SVOC
During installation of Monitoring Well MW-3, a buried 5-gallon bucke
approximately 20 feet north of the drilling location. On September 9, 1992,
geophysical survey trenches were excavated to approximately three feet b(
("BLS'') in the area. Five soil samples (A through E) were collected and an
SVOCs and RCRA metals. The specific locations of these samples and the 1
indicated in the Delta report
On September 10, 1992, Delta collected eight soil samples (BAC-1, BAC-2, S-1, S-2, S-3, S-4,
S-5 and S-6) ranging in depth from 17 to 50 feet BLS. Soil samples BAC-1 and BAC-2 were
collected as background samples. In addition, Delta collected four sediment samples (SEDl,
SED2, SED3 and SED4). The soil and sediment samples were analyzed for VOCs, SVOCs and
RCRA metals.
On December 14, 1992, Delta installed six temporary monitoring wells (TMW-1 through TMW-
4, TMW-7 and TMW-8) to further define the horizontal extent of the dissolved contaminant
plume.
4.4.1 Groundwater Sample Analytical Results
On March 3, 1992, Delta sampled monitoring wells MW-1 through MW-6. VOCs were detected
in all groundwater samples. Total VOC concentrations ranged from 11 µg/L (MW-4) to 3,060
µg/L (MW-2). A summary of VOC laboratory results for monitoring well samples is presented
in Table 4-4.
4-9
S :\ 13 54\PROJEC1\1997\97-17 SA AquAir Il\Rl Report\RI Cha pt 4 -02.doc
Sample ID MW-1
Units µg/L
Sample Date 03103192
Acetone 4 BJ
1,1-Dichloroethene 3 J
1,1-Dichloroethane <IO
1,2-Dichloroethene (total) 10 J
Chlorobenzene BQL
Chloromethane BQL
Chloroform 13
1,2-Dichloroethane 74
Methyl Ethyl Ketone <10
Methylene Chloride <10
1,1,1-Trichloroethane 1 J
Carbon Tetrachloride <IO
Trichloroethene 73
1,1,2-Trichloroethane 1 J
Tetrachloroethene 4 J
1,1,2,2-Tetrachloroethane 54
Benzene <10
Toluene 2 J
Undecane BQL
Unknown BQL
Unknown BQL
Unknown Hydrocarbon BQL
Unknown Hydrocarbon BQL
Unknown Si!oxane BQL
Unknown Siloxane BQL
Total VOCs 239
--Notes:
S:\l354\Projecl\l997\97175A\Della 4-4 to4-IO.xls
MW-2 MW-3
µg/L µg/L
03103192 03103192
120 B <25
740 290
15 J <25
<50 6 J
BQL BQL
BQL BQL
. 95 67
s J <25
45 J <25
<50 <25
640 190
20 J 91
so J 290
<50 <25
1300 E 190
25 4 J
s J <25
<50 <25
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
3,060 1,128
Table 4-4
DELTA HISTORICAL GROUNDWATER voe DATA
AQUAIR SITE REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-175A
MW-4 MW-5 MW-6 MW-7* MW-7 MW-8
µg/L µg/L µg/L µg/L µg/L µg/L
MW-9
µg/L
03103192 03103192 03/03/92 03103192 09/29192 09/29/92 09/29/92
11 B 10 B 17 B <10 BQL BQL BQL
<IO <10 1 J <10 <5 <5 630*
<IO <10 <10 <10 <5 <5 47
<10 <10 <10 9 J BQL BQL BQL
BQL BQL BQL BQL <5 <5 320
BQL BQL BQL BQL <10 <10 15
<10 <10 4 J 12 <5 <5 11000*
<10 <10 <10 77 <5 <5 8600
<10 <10 <10 <10 BQL BQL BQL
<10 <10 <10 <10 8 B 13 B 4800*
<10 <10 3 J 1 J <5 <5 890*
<IO <10 1 J <10 <5 <5 30000*
<10 <10 4 J 74 <5 <5 5500*
<IO <10 <10 1 J <5 <5 23
<IO <10 2 J 4 J <5 <5 7900*
<IO <10 <10 65 <5 <5 26
<10 <10 <10 <IO BQL BQL BQL
<10 <IO <10 1 J <5 <5 390
BQL 16 NJ BQL BQL BQL BQL BQL
BQL 7 NJ BQL BQL BQL BQL BQL
BQL 5 NJ BQL BQL BQL BQL BQL
BQL 6 NJ BQL BQL BQL BQL BQL
BQL 7 NJ BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL BQL BQL
11 51 32 244 8 13 70,141
BQL ~ Befo\V LabOratory Quantitation Limits.
µg/L -Micrograms per Liter.
B, E -lab-fo house qualifiers
J -Estimated Value.
MW -Monitoring Well • -Compound exceeded calibration on initial analysis
MW-7* is a duplicate of MW-I
Page I
MW-10 DW-1 DW-2 DW-3 DW-4
µg/L µg/L µg/L µg/L µg/L
09/29/92 09/29/92 09/29192 09/29/92 09/29/92
BQL BQL BQL BQL BQL
30 <5 460 <5 <5
<5 <5 <50 <5 <5
BQL BQL BQL BQL BQL
<5 <5 540 <5 <5
<10 <10 <100 <5 <5
320 <5 18000* <5 <5
<5 <5 7100* <5 <5
BQL BQL BQL BQL BQL
21 8 B 4700* 11 B 8 B
14 <5 990 <5 <5
<5 <5 26000* <5 <5
<5 <5 4600 <5 <5
<5 <5 <50 <5 <5
10 <5 3800* <5 <5
<5 <5 54 <5 <5
BQL BQL BQL BQL BQL
<5 <5 480 <5 <5
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
BQL BQL BQL BQL BQL
395 8 59,624 11 8
FACILITY JWMGIT
I
, ____ SEWER
/~on
I MW-10
I F~ ~.l----------"t-"----i 400
SAii Nm.Y ROM 1-r' DRAltl LINE
PRODUCTION
BUILDING
GRAPHIC SCALE
100 0 llO 100 200 ~~~-~-~-...l~iiiiiiiiiiii'•-1---'
(mn:rr)
• SED4
\
"' .. /UNNAMED CREEK
SANITARY SEWER
TMW-4
/II
TMW-1
/II
TMW-2 /II
TMW-3 /II
TMW-8 /II
""'
MW-7 + DW-2
0
(ISO)
/II
[2000]
26"
MONITORING Vtll.L
DEEP MONITORING WELL
TCA CONCENlRA'TION
HAND AUGER
CARBON TETRACHLORIDE CONCENlRA TION
CHROMIUM CONCENlRA TION
W~f~ fl-~\~~1MENO~fG
~}:'~1~ Mt-4.!S~~~M,W)OllJUG
SOIL SAMPLES WERE OBTAINED ON 9/10/92
~~~imt~~u~ OW'~~ IN
DEL TA ENVIRONMENTAL SAMPLING POINTS
SCALE:
AQUAIR REMEDIAL INVESTIGATION
CHARLOTIE, NORTH CAROLINA
CHECKED BY: DRAWN BY: MFP AS SHOWN
JOB NO. . DA lE: AGURE NO. 1354-97-175 7-9-97 4-2
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
SVOes were detected in groundwater samples collected from MW-1, MW-2, MW-3, MW-5,
and duplicate MW-7 (Figure 4-2). Total SVOe concentrations ranged from 2 µg/L (MW-5) to
42 µg/L (MW-1 and its duplicate MW-7). A summary of SVOe laboratory results for
monitoring well samples appears in Table 4-5.
Metals were detected in groundwater samples collected from MW-1, MW-2, MW-3, MW-4,
MW-5, MW-6 and duplicate MW-7. A summary of metals laboratory results for monitoring
well samples appears in Table 4-6.
On September 29, 1992, Delta sampled monitoring wells MW-7 through MW-10 and deep
monitoring wells DW-1 through DW-4. VOes were detected in all groundwater samples;
however, samples from DW-1, DW-3, and DW-4 only contained one voe (methylene chloride)
that was detected in the laboratory blank. voes were not detected in the duplicate sample
collected from DW-4.
Total voe concentrations ranged from 8 µg/L (MW-7) to 70,141 µg/L (MW-9) in the shallow
aquifer monitoring well samples. Total VOe concentrations ranged from 8 µg/L (DW-1/DW-4)
to 66,724 µg/L (DW-2). SVOes were not detected.
Metals were detected in the groundwater samples collected from MW-7, MW-8, MW-9, MW-10,
DW-1, DW-3 and DW-4. Metals were not detected in the groundwater sample from DW-2. The
concentration of individual metals did not appear elevated.
On December 14, 1992, Delta installed six temporary monitoring wells (TMW-1 through TMW-
4, TMW-7 and TMW-8) to further define the horizontal extent of the dissolved contaminant
plume. voes were detected in groundwater samples collected from TMW-1 and TMW-4; total
voe concentrations were 80 µg/L and 63 µg/L, respectively. A summary of voe laboratory
results for monitoring well samples appears in Table 4-7.
4-12
S:\1354\PROJECT\l 997\97-l 75A AquAir Il\RI Report\RI Chapt 4 -02.doc
Table 4-5
DELTA HISTORICAL GROUNDWATER SVOC DATA
AQUAIR SITE REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&MEProjectNo. 1354-97-175A
Sample ID MW-1
Units µg/L
Sample Date 3/3/1992
Unknown BQL
Unknown BQL
Chlorinated Unknown 39 NJ
Di-n-butylphthalate 3 J
1-Methyl-2-ethycyclohexane BQL
Total SVOCs 42
Notes:
BQL -Below Laboratory Quantitation Limits.
J -Estimated Value.
µg/L -Micrograms per Liter.
MW -Monitoring Well
MW-7* is a duplicate ofMW-1
N -lab in house qualifiers
S:\1354\Project\1997\97175A\Delta 4-4 to 4-10.xls
MW-2
µg/L
3/3/1992
3 NJ
BQL
12 NJ
BQL
BQL
I 15
I
MW-3 MW-4 MW-5
µg/L µg/L µg/L
3/3/1992 3/3/1992 3/3/1992
BQL BQL BQL
2 NJ BQL BQL
4 NJ BQL BQL
BQL BQL 2 J
BQL BQL BQL
6 0 2
Page I
MW-6 MW-7*
µg/L µg/L
3/3/1992 3/3/1992
BQL BQL
BQL BQL
BQL 40 NJ
BQL 2 J
BQL BQL
0 42
Sample ID MW-I MW-2
Units µg/L µg!L
Sample Date 03/03/92 03/03/92
Aluminum 11700 E* 24300 E
Antimony <22 <22
Barium 232 423
Beryllium <l <I
Cadmium <2 <2
Calcium 40500 69500
Chromium <5 85.1
Cobalt 18.2 B 31.8 B
Copper 9.1 B 20.4 B
Iron 23800* 32200*
Lead 2.2 B 4.4 w
Magnesium 28800 33900
Manganese 860 N 878 N
Nickel <5 67.5
Potassium 4380 B 10900
Sodium 21700 E 31900 E
Vanadium 48.7 B 57.1
Zinc 63.7* 79.7*
Notes:
S:\1354\Project\1997\97 l 75A\Delta 4-4 to 4-10.xls
MW-3
µg!L
03/03/92
156000 E*
65.8 B
1810
3 B
2.4 B
153000
18.3
220
152
290000*
12.7 s
130000
2810 N
32.I B
24600
34000 E
618
830*
Table 4-6
DELTA IDSTORICAL GROUNDWATER METALS DATA
AQUAIR REMEDIAL INVESTIGATION
MW-4
µg/L
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-175A
MW-5 MW-6 MW-7* MW-7 MW-8
µg/L µg/L µg/L µg/L µg/L
MW-9
µg/L
03/03192 03/03/92 03/03/92 03/03/92 09/29/92 09/29/92 09/29/92
38200 E 123000 E* 36000 E* 7740 E* BQL BQL BQL
<22 53.4 B <22 <22 BQL BQL BQL
389 1450 831 193 B 2600 400 280
<l 3.2 B <I <I BQL BQL BQL
<2 <2 <2 <2 BQL BQL BQL
49300 70500 47300 37500 BQL BQL BQL
7.7 B 8.1 B <5 <5 30 60 <10
41.9 I68 125 13 B BQL BQL BQL
32.3 62.9 36.8 6.5 B BQL BQL BQL
61100* 212000* 87200* I5000* BQL BQL BQL
5.2 21.5 s 3.2 w 2.5 B 25 7 7
33700 79600 35900 26300 BQL BQL BQL
654 N 3800 N 4530 N 776 N BQL BQL BQL
24.7 B 13.4 B 7.5 B <5 BQL BQL BQL
5270 12100 4950 3920 BQL BQL BQL
26400 E I9100 E 17200 E 21100 E BQL BQL BQL
122 436 138 32.4 1000 60 50
I61* 590* 245* 41.6* BQL BQL BQL
MW-IO
µg/L
09/29/92
BQL
BQL
2900
BQL
BQL
BQL
40
BQL
BQL
BQL
23
BQL
BQL
BQL
BQL
BQL
370
BQL
E, N, S, W -Lab in house qualifiers
B -Compound in bank
DW-I DW-2
µg/L µg/L
09/29/92 09/29/92
BQL BQL
BQL BQL
100 <100
BQL BQL
BQL BQL
BQL BQL
<IO <IO
BQL BQL
BQL BQL
BQL BQL
<5 <5
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
<50 <50
BQL BQL
BQL -Below Laboratory Quantitation Limits.
µg/L -Micrograms per Liter.
MW -Monitoring Well * -Compound exceeded calibration on initial analysis
MW-7* is a duplicate ofMW-1
Page l
DW-3 DW-4
µg/L µg/L
09/29/92 09/29/92
BQL BQL
BQL BQL
3400 490
BQL BQL
BQL BQL
BQL BQL
90 40
BQL BQL
BQL BQL
BQL BQL
51 9
BQL BQL
BQL BQL
BQL BQL
BQL BQL
BQL BQL
740 110
BQL BQL
Table 4-7
DELTA HISTORICAL GROUNDWATER voe DATA FROM TEMPORARY WELLS
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175A
Sample ID TMW-1 TMW-2 TMW-3 TMW-4 TMW-7
Date Sampled 12/15/1992 12/15/1992 12/15/1992 12/15/1992 12/15/1992
Units µg/L µg/L µg/L µg/L µg/L
Chloroform <1.0 <1.0 <1.0 2 <1.0
1,2-Dichloroethane 5 <1.0 <1.0 2 <1.0
1,1,1-Trichloroethane <1.0 <1.0 <1.0 1 <1.0
Trichloroethene 42 <1.0 <1.0 27 <1.0
Tetrachloroeth ene 33 <1.0 <1.0 31 <1.0
Total VOCs 80 0 0 63 0
Notes:
µg/L -Micrograms per Liter.
S:\1354\Froject\l 997\97175A \Delta 4-4 to 4-1 O.xls Page 1
TMW-8
12/15/1992
µg/L
<1.0
<1.0
<1.0
<1.0
<1.0
0
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
4.4.2 Soil and Sediment Sampling Analytical Results
October 2001
S&ME Project No. 1354-97-175 A
Two perpendicular geophysical survey trenches were excavated to approximately 3 feet BLS in
the area of the 5-gallon bucket (Figure 4-2) discovered near monitor well MW-3. Five soil
samples were collected (A through E).
voes and SVOes were not detected above laboratory quantification limits in the soil samples.
Metals were detected in test soil Samples A through E. Total metals concentrations ranged from
225 mg/kg (Sample e) to 734 mg/kg (Sample E). A summary of metals laboratory results for the
test-pit trench samples appears in Table 4-8.
On September 10, 1992, Delta collected 8 soil samples (BAe-1, BAe-2, S-1, S-2, S-3, S-4, S-5
and S-6) ranging in depth from 17 to 50 feet BLS. Soil samples BAe-1 and BAC-2 were
collected as background samples. In addition, Delta collected four sediment samples (SEDl,
SED2, SED3 and SED4).
VOC concentrations were detected in soil samples S-1, S-4 and S-6. voes were not detected in
the other soil samples or the sediment samples. A summary of voe analytical results appears in
Table 4-9. SVOCs were not detected.
Metals were detected in all samples. Metals concentrations ranged from 119 mg/kg (BAC-2) to
2,367 mg/kg (S-3). A summary of metals laboratory results for the soil samples appears in Table
4-10.
4.5 ADDITIONAL SITE INVESTIGATION -SEPTEMBER 1996
On September 11, 1996, Geraghty & Miller ("G&M") conducted an Additional Site Investigation
("ASI") to further assess environmental conditions at the Site. During the ASI, G&M collected
nine soil samples (SS-1, SS-2, SS-4, SS-5, SS-6, SS-7, SS-8, SUMP-1, SUMP-2) and one
sediment sample (DRAIN SEDIMENT) (Figure 4-3). Samples SS-1 and SS-2 were
4-16
S:\1354\PROJEC1\l 997\97-l 7 5A AquAir 11\RJ Report\RI Chapt 4 -02.doc
Table 4-8
DELTA HISTORICAL TEST TRENCH SOILS METALS DATA
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-l 75A
Sample SOIL SAMPLES
ID A B c D E
Units mg/kg mg/kg mg/kg mg/kg mg/kg
Sample Date 9/9/1992 9/9/1992 9/9/1992 9/9/1992 9/9/1992
Mercury <0.25 <0.25 <0.25 <0.25 <0.25
Arsenic 1.3 1.2 0.9 <1.0 1.1
Lead 17 13 8 12 27
Silver <2.0 <2.0 <2.0 <2.0 <2.0
Barium 88 100 13 220 100
Cadmium <1.0 <1.0 <1.0 <1.0 <1.0
Chromium 53 18 63 44 36
Selenium <1.0 <1.0 <1.0 <1.0 <1.0
Vanadium 140 160 140 150 570
Notes:
mg/kg -milligrams per kilogram
S:\1354\Project\ 1997\97 l 75A\Delta 4-4 to 4-10.xls Page 1
Sample ID
Units
Table 4-9
DELTA HISTORICAL VOC DATA FOR SOILS and SEDIMENTS
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-175A
SOIL SAMPLES
BAC-1 BAC-2 S-1 S-2 S-3 S-4 S-5 S-6 SED-1
mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
SEDIMENT SAMPLES
SED-2 SED-3 SED-4
mg/kg mg/kg mg/kg
Sample Date 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92 09/10/92
Carbon Tetrachloride <0.0065 <0.0065 <0.0065 <0.0055 <0.014 3.4 <0.0055 0.026 <0.32 <0.34 <0.010 <0.026
Chloroform <0.0065 <0.0065 0.067 <0.0055 <0.014 <0.28 <0.0055 0.025 <0.32 <0.34 <0.010 <0.026
Methylene chloride 0.029 B 0.021B 0.022B 0.022B <0.014 <0.28 <0.0055 0.021B <0.32 <0.34 <0.010 <0.026
Tetrachloroethene <0.0065 <0.0065 0.019 <0.0055 <0.014 1.3 <0.0055 0.18 <0.32 <0.34 <0.010 <0.026
1,1,2,2-Tetrachloroethane <0.0065 <0.0065 <0.0065 <0.0055 0.26 <0.28 <0.0055 <0.0065 <0.32 <0.34 <0.010 <0.026
1,1,1-Trichloroethane <0.0065 <0.0065 <0.0065 <0.0055 <0.014 <0.28 <0.0055 0.007 <0.32 <0.34 <0.010 <0.026
Trichloroethene <0.0065 <0.0065 <0.0065 <0.0055 <0.014 1.2 <0.0055 <0.0065 <0.32 <0.34 <0.010 <0.026
Total VOCs 0.029 0.021 0.108 0.022 0.26 5.9 0 0.259 0 0 0 0
Notes:
mg/kg -milligrams per kilogram
B -Constituent is also detected in the control black
S:\1354\Project\1997\97 l 75A\Delta4-4 to 4-10.xls Page 1
Sample
ID
Units
Sample Date
Mercury
Arsenic
Lead
Silver
Barium
Cadmium
Chromium
Selenium
Vanadium
Table 4-10
DELTA HISTORICAL METALS DATA FOR SOILS AND SEDIMENTS
AQUAIRSITE
BAC-1
mg/kg
09110192
<0.25
1
4.5
<2.0
84
<1.0
22
<1.0
130
BAC-2
mg/kg
09/10/92
<0.25
<1.0
4
<2.0
31
<1.0
10
<1.0
74
Notes:
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-l 75A
SOIL SAMPLES
S-1 S-2 S-3 S-4 S-5 S-6
mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg
09/10/92 09/10/92 09110192 09/10/92 09110192 09110192
<0.25 <0.25 <0.25 <0.25 <0.25 <0.25
1.9 1.7 1.4 1.6 <1.0 <1.0
14 4 42 42 370 7.9
<2.0 <2.0 <2.0 <2.0 <2.0 <2.0
54 60 49 190 100 50
<1.0 <1.0 1.3 1.8 17.0 <1.0
30 50 74 95 490 110
<1.0 <1.0 <1.0 <1.0 <1.0 <1.0
140 360 2200 370 56 1150
mg/kg -milligrams per kilogram
SED-1
mg/kg
09/10/92
0.91
1.4
66
9.8
95
38
810
<1.0
700
S:\l 354\Project\! 997\97 ! 75A\Delta 4-4 to 4-1 O.xls Page I
SEDIMENT SAMPLES
SED-2 SED-3 SED-4
mg/kg mg/kg mg/kg
09/10/92 09110192 09110192
0.46 <0.25 <0.25
1.4 1.9 <1.0
79 61 59
3.0 <2.0 <2.0
91 55 63
22.0 5.8 4.8
1500 200 300
<1.0 <1.0 <1.0
340 510 290
RI REPORT-CHAPTER 4 October 2001
AQUAIR REMEDIAL INVESTIGATION S&ME Project No. 1354-97-175 A
collected adjacent to the septic tank. Samples SS-4 and REP-01-SS were collected at the
discharge of the floor drain. The soil and sediment samples were analyzed for VOCs, SVOCs
and RCRA metals.
As part of the ASI, G&M installed and sampled five temporary monitoring wells (GW-1 through
GW-5). G&M also collected one fluid sample from the septic tank (SEPTIC TANK). The
water/fluid samples were analyzed for VOCs, SVOCs and RCRA metals. The sampling
locations appear on Figure 4-3.
4.5.1 Groundwater Sampling Analytical Results
G&M collected five groundwater samples (GW-1, GW-2, GW-3, GW-4, and GW-5) and one
septic-tank fluid sample (SEPTIC TANK) during the ASL In addition, G&M collected one
duplicate (REP-01) sample of GW-2.
VOCs were detected in groundwater/fluid samples including GW-1, GW-4, and the SEPTIC
TANK. Concentrations of Total VOCs ranged from 63 µg/L (GW-4) to 23,500 µg/L (SEPTIC
TANK). A summary ofVOC laboratory results for the groundwater samples appears in Table 4-
11.
SVOCs were not detected in any of the groundwater samples. A total SVOC concentration of31
µg/L from two phthalates was detected in the septic-tank fluid SEPTIC TANK sample.
Metals were not detected in any of the groundwater samples. Metals were detected in fluid
sample SEPTIC TANK and included barium (306 µg/L), cadmium 8.54 µg/L, chromium (1,240
µg/L), and lead (37.7 µg/L).
4-20
S:\l 354\PROJECT\l 997\97-l 75A AquAir 11\RI Report\RI Chapt 4 -02.doc
/
I I
NORFOLK SOUTHERN RAILROAD ------
AQUAIR
FACILITY
JIUM_
I
CMUD SEWER
WOODS
OW-1 'f;
I
I----SEWER ..--
1 I ~)O
FORMER
PRODUCTION
BUILDING ....---~~~=!
CLEARING
(fi
llllHI
GRAPHIC SCALE
120 o eo 120 240 ~-J I 1-----11
( IN m:l')
.,----ABANDONED SUPPLY YtRL
/REA Of DRAIN UllE E:fR.IJEMT RUNOFF
.---SEPTIC TANK
DW-2
f~
----DIKED ABOVE GROUND STORAGE TANK AREA
WOODS
WOODS
WOODS
® GW-2
\
GW-2 +
MW-6
"ti
SS-5
@
LEGEND
WATER SUPPLY WELL
SURF ACE WATER FLOW
DIRECTION
TEMPORARY \\£LL
EXISTING MONITOR WELL
(NOT SAMPLED UNDER
SUPPLEMENTAL INVESTIGATION)
SOIL SAMPLE LOCATION
E
GERAGHTY & MILLER SAMPLING LOCATIONS
SCALE:
JOB NO.
AQUAlR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
CHECKED BY:
AS SHOWN
DRA'tflt,I BY: MFP
DA'IE: AGURE NO. 1354-97-175A 11-07-00 4-3
Sample ID
Date Sampled
Units
Cic-1,2-Dichlorethene
Carbon Tetrachloride
Chloroform
1,1-Dichloroethene
Methyl Chloride
Tetrachloroethene
Trichloroethene
Carbon Disulfide
1,2-Dichloroethane
1,1-Dichloroethane
1,1,1-Trichloroethane
Total VOCs
Table 4-11
GERAGHTY & MILLER IDSTORICAL GROUNDWATER voe DATA
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-l 75A
GW-1 GW-2 REP-01 GW-4 GW-5
7/30/1996 7/30/1996 7/30/1996 7/30/1996 7/30/1996
µg/L µg/L. µg/L µg/L µg/L
200DJ <1 <1 <1 <1
1,200 <1 <1 <1 <1
12,000 D <1 <1 <1 <l
490 <1 <1 2.1 <1
660 <1 <1 <1 <1
5,100 <1 <1 43 <1
830 <1 <1 16 <1
<200 19D 23 <1 23
<200 <1 <1 2.1 <1
240 <l <l <1 <1
390 <1 <1 <l <1
21,110 19 23 63.2 23
Notes: BQL -Below Laboratory Quantitation Limits.
J -Estimated Value.
D -Constituent was Detected using a Second Dilution.
µg/L -Micrograms per Liter.
REP-01-SS -Duplicate of SS-01
S:\1354\Project\l 997\97175A\G&M 4-11 to 4-14.xls Page 1
SEPTIC TANK
7/30/1996
µg/L
<1250
18,000
<1250
960 J
<1250
3,200
420 J
<1250
<1250
<1250
920 J
23,500
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
4.5.2 Soil and Sediment Sampling Analytical Results
October 2001
S&ME Project No. 1354-97-175 A
On September 11, 1996, G&M collected nine soil samples and one sediment sample and SS-2
were collected adjacent to the septic tank. Samples SS-4 and REP-01-SS were collected at the
discharge of the floor drain.
VOCs were detected in all soil and sediment samples except in Soil Sample SUMP-02.
Concentrations of Total VOCs ranged from 86 µg/kg (SUMP-1) to 778,600 µg/kg (SS-7). A
summary ofVOC laboratory results for the soil/sediment samples appears in Table 4-12.
SS-1, SS-2, SS-8 and DRAIN SEDIMENT were not analyzed for SVOCs. SVOCs were not
detected in soil samples SS-4, SS-6, SUMP-1 and SUMP-2. SVOCs were detected in soil
samples SS-5, SS-7, and REP-01-SS. Total concentrations of SVOCs ranged from 1,400 µg/kg
(SS-5) to 31,250 µg/kg (SS-7). A summary of SVOC laboratory results for the soil/sediment
samples appears in Table 4-13.
Metals were detected in all soil samples and Sediment Sample DRAIN SEDIMENT. Metals
concentrations ranged from 67 µg/kg (SUMP-1) to 6,796 µg/kg (DRAIN SEDIMENT). A
summary of metals laboratory results for the soil/sediment samples appears in Table 4-14.
4.6 SUPPLEMENTAL SITE AND REMEDIAL OPTIONS EVALUATION -
FEBRUARY 1997
From February to June 1997, S&ME performed a Supplemental Site Investigation ("SSI") and
Remedial Options Evaluation ("ROE"). The SSI focused on refining the extent of VOC-
contaminated sediment, surface water and groundwater, and defining hydrogeologic
characteristics pertinent to evaluating remedial alternatives. The ROE evaluated selected
remedial technologies for use at the Site. The ROE include a 72-hour pump test in the Bedrock
Aquifer, an air-sparging ("AS") pilot test in the Shallow Aquifer, and a soil-vapor extraction
pilot test in the unsaturated zone. Preliminary remedial objectives were also evaluated.
4-23
S:\1354\PROJECTll 997\97-l 75A AquAir Il\RI Report\RI Chapt 4 -02.doc
Sample ID SS-1
Media Soil
Date Sampled 7/10/1996
Units µg/kg
Acetone 53J
Benzene <33
2-Butanone <66
Carbon Disulfide <33
Carbon Tetrachloride 1,000
Chlorobenzene <33
Chloroform 11 J
2-Chlorotoluene <33
1,2 Dlchlorobenzene <33
1,1 Dichlorethane <33
1,1 Dicblorethene 48
Cls-1,2-Dichlorethene <33
Trans-1,2-Dichlorethene <33
Ethylbenzene <33
Hexachlorobutadiene <33
4-Methyl-2-pentanone <33
Methylene Chloride <33
1,1,1,2 Tetrachloroethane <33
1,1,2,2 Tetrachloroethane <33
Tetrachloroetbene 170
Toluene <33
1,2,3 Trichlorobenzene <33
1,2,4 Trlchlorobenzene <33
1,1,2 Trichloroethane <33
Tricbloroethene IS J
1,2,4 Trimethylbenzene <33
1,1,1 Trichloroethane NS
Xylenes <33
Total VOCs 1,297
Table 4-12
GERAGHTY & MILLER HISTORICAL SOIL voe DAT A
AQUAIR REMEDIAL INVESTIGATION
SS-2
Soil
7/10/1996
µg/kg
<308
<31
<62
<31
240
<31
5.8 J
<31
<31
<31
<31
<31
<31
<31
<31
<31
<31
<31
<31
580
<31
<31
<31
<31
32
<31
NS
<31
857.8
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-175 A
SS-4 REP-01-SS SS-5 SS-6 SS-7
Soil Soil Soil Soil Soil
7/11/1996 7/11/1996 7/11/1996 7111/1996 7/11/1996
µg/kg µg/kg µg/kg µg/kg µg/kg
220 830 J 900 J <155000 30,000
<30 <738 <731 <5500 <39375
<60 <1476 <1462 <31000 <78750
7.7 J <738 <731 <15500 <39375
<30 <738 <731 3,200 J <39375
37 <738 600J 120,000 8,600 J
170 140 J 800 3,700 J <39375
<30 <738 <731 <15500 <39375
18 J <738 3,600 <15500 <39375
24 J <738 <731 <15500 <39375
56 <738 <731 <15500 <39375
640 530 J <731 <15500 <39375
<30 <738 <731 <15500 <39375
<30 <738 <731 <15500 <39375
<30 <738 <731 <15500 <39375
74 <738 <731 <15500 <39375
<30 <738 <731 <15500 <39375
<30 <738 <731 <15500 <39375
<30 <738 11,000 120,000 <39375
2,300 D 2,800 19,000 490,000 740,000
30 <738 270 J 6,100 J <39375
lSJ <738 <731 <15500 <39375
480 <738 <731 <15500 <39375
<30 <738 <731 <15500 <39375
740 790 6,800 21,000 <39375
6.5 J <738 <731 <15500 <39375
NS NS NS NS <39375
<30 <738 <731 5,800 J 5,200 J
4,818.2 5,090 42,700 769,800 783,800
SS-8
Soil
7/2911996
µg/kg
130 J
71
210
13
3,500 D
140
1,100 DJ
8.1 J
720 DJ
150
1,600 J
1,200
89
6.7 J
79
530
1,100
16 J
650
82,000D
84
<34
43
14 J
3,900 J
15 J
4,800 J
54
10,246.8
Notes: BQL -Below Laboratory Quantitation Limits.
J -Estimated Value.
NS-Not Analyzed for This Parameter.
D -Constituent was Detected using a Second Dilution.
REP-01-SS -Duplicate of SS-04
All Analysis for SUMP-2 were Less Than the Quantitative Limits
S:ll354\Projcct\1997\97175AIG&M 4-11to4-14.xls Page I
SUMP-1 SUMP-2 DRAIN
Soil Soil Sediment
7/11/1996 7/12/1996 7/10/1996
µg/kg µg/kg µg/kg
<6.3 <62 <28750
<6.3 <6.2 <2875
<12.6 <12.4 <5750
<6.3 <6.2 <2875
<6.3 <6.3 77,000
<6.3 <6.4 <2875
<6.3 <6.5 280 J
<6.3 <6.6 <2875
<6.3 <6.7 <2875
<6.3 <6.8 <2875
<6.3 <6.9 440 J
<6.3 <6.10 <2875
<6.3 <6.11 <2875
<6.3 <6.12 <2875
<6.3 <6.13 <2875
<6.3 <6.14 <2875
<6.3 <6.15 <2875
29 <6.16 <2875
so <6.17 <2875
<6.3 <6.18 83,000
<6.3 <6.19 <2875
<6.3 <6.20 <2875
<6.3 <6.21 <2875
<6.3 <6.22 <2875
7.1 <6.23 1,100 J
<6.3 <6.24 <2875
<6.3 <6.25 3,400
<6.3 <6.26 <2875
86.1 0 165,220
Table 4-13
GERAGHTY & MILLER HISTORICAL SOIL SVOC DATA
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-l 75A
Sample ID SS-4 REP-01-SS
Date Sampled 7/1111996 7111/1996
Units µg/kg µg/kg
1,2 Dichlorobenzene <393 <1571
Bis-2-Ethylhexyl phthalate <393 <1571
2-Methylnaphthalene <393 <1571
2-Methylphenol ( o-cresol) <393 180J
Naphthalene <393 <1571
N-Nitrosodiphenylamine <393 <1571
Phenol <393 7,500 J
1,2,4-Trichlorobenzene <393 960 J
Total SVOCs 0 8,640.0
Notes: J -Estimated Value.
S:\1354\Project\1997\97175A\G&M 4-11 to 4-14.xls
mg/kg -Milligrams per kilogram
REP-01-SS -Duplicate of SS-04
Page 1
SS-5
7/11/1996
µg/kg
1,400
<389
<389
<389
<389
<389
<389
<389
1,400.0
SS-7
711111996
µg/kg
590J
26,000
900 J
<4160
1,400 J
1,600 J
760
<4160
31,250
Table4-14
GERAGHTY & l\1ILLER IDSTORICAL SOILS METALS DATA
AQUAIR REMEDIAL INVESTIGATION
Sample ID SS-1 SS-2
Date Sampled 7/10/1996 7/10/1996
Units mg/kg mg/kg
Arsenic 2.66 1.56
Barium 166 122
Cadmium <0.65 0.85
Chromium 123 367
Lead 7.96 8.88
Mercury <0.13 <0.12
Silver <l.30 1.57
Notes: J -Estimated Value.
mg/kg -Milligrams per kilogram
REP-01-SS -Duplicate ofSS-04
S:\1354\Project\l 997\97175A\G&M 4-11 to 4-14.xls
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME Project No. 1354-97-l 75A
SS-4 REP-01-SS SS-5 SS-6 SS-7
7/1111996 7/11/1996 7/11/1996 7/11/1996 7 /11/1996
mg/kg mg/kg mg/kg mg/kg mg/kg
3.82 4.18 4.61 4.59 3.42
66.1 86.3 72 78.1 60.0
11.6J 1.79 J <0.58 2.95 38.3
1,220 J 75.2 J 87.1 65.2 1,310
22.7 21.8 22.3 18.3 27.7
<0.12 <0.12 <0.12 0.31 0.7
<1.21 <l.21 <l.16 <l.27 <1.29
Page 1
SUMP-I SUMP-2 DRAIN
7/11/1996 7/11/1996 7/10/1996
mg/kg mg/kg mg/kg
2.14 2.67 4.76
46.6 62.8 162
<0.64 <0.59 19.4
11.8 236 6,510
6.56 14.9 65.9
<0.13 <0.12 10.3
<l.28 <l.18 24.30
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
4.6.1 Shallow Aquifer Groundwater Investigation
October 2001
S&ME Project No. 1354-97-175 A
As part of the Shallow Aquifer investigation, S&ME performed the following work: (1) in situ
groundwater sampling using direct-push Geoprobe® sampling equipment; (2) installation of
three piezometers and temporary wells; (3) installation of one Type-II monitoring well; (4)
groundwater sample collection and chemical analysis; (5) slug testing; (6) and in situ
measurement of groundwater flow. Figure 4-4 shows the sample locations. In addition, soil
physical characteristics were assessed to evaluate hydraulic parameters of the aquifer.
On February 20, 1997, a truck-mounted Geoprobe® unit collected Groundwater Sample APH-
04-GW-01 at a depth of 10 feet BLS. Piezometer APH-04 was also installed with the
Geoprobe® rig to monitor groundwater levels.
On February 21, 24 and 25, 1997, S&ME installed two temporary wells (ATW-202 and ATW-
203) and one piezometer (APZ-101) using an all-terrain vehicle ("ATV") mounted drill rig. The
PVC wells/piezometer were installed at auger refusal.
On February 18 and 19, 1997, one Type II monitoring well was installed just east of the septic
tank by the ATV rig. The borehole was terminated at refusal at a depth of 35 feet BLS. Type-II
Monitoring Well AMW-101 was subsequently constructed in the test borehole.
Groundwater samples were collected for chemical analysis from the following locations: (1) two
temporary wells, ATW-202 and ATW-203; (2) Geoprobe® location APH-04; (3) the abandoned
supply well identified as ESW-1; (4) new monitoring well AMW-101; and (5) four existing
Delta Monitoring Wells MW-3, MW-6, MW-9, and MW-10. All groundwater samples were
analyzed for VOCs, SVOCs and RCRA metals. In addition, groundwater samples collected from
AMW-101 and MW-9 were analyzed for iron, hardness, and total organic compounds ("TOC").
4-27
S:\1354\PROJECT\! 997\97-l 75A AquAir II\Rl Report\Rl Chapt 4 -02.doc
I
AQUAIR
FACILITY
~DW-1
MW-8..,......
~C1
CATE
FORMER
LABORATORY
BUILDING
'CIMOIT I
/::::-SEYER
I
I
PRODUCTION L.J ' FORMER~!~1 ll
BUILOI~-~---! j
MW-4+ I ! -------JI r---I
-( COHCllC1E )
SVE-t w-
GRAPHIC SCALE
120 0 60 120 240 5--'--1--1~---...11
( IN P'E!'l' )
~
AlW-202
"tw-1
\
. "' .. /UNNAMED CREEK
CMUD SEWER
AlW-203
~+
ATB-05
AlB-02 ++
TMW-4
+ lMW-1
+ lMW-2 + lMW-8
+ TMW-3
DW-3 + +
iw-6• TMW-7 ATB-03
l-1-: ~ ~ ~ ~ Cl -~ ~ -~ 7> 1-~~;. "" ~~
"'F>
+ GW-3
+ GW-2
\
SCALE:
LEGEND
+ SPARGE OR SVE WELL OR PIEZOMETER
+ SHALLOW AQUIFER MONITORING WELL
@ TEMPORARY SHALLOW MONITORING WELL
OR PIEZOMETER
@ DEL TA TYPE Ill MONITORING WELL
+ DELTA TYPE II MONITORING WELL
+ BEDROCK AQUIFER WELL
~ WATER SUPPLY WELL
AlB-04+
E
GROUNDWATER SAMPLING LOCATIONS
AS SHOWN
AQUAIR SITE
CHARLOTIE, NORTH CAROLINA
DRAv.t.I BY: MFP CHECKED BY:
J00 NO. DA TE: FIGURE NO. 1354-97-175 10-2-97 4-4
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
During sampling, temperature ("T"), specific conductivity ("SC"), and pH were measured. In
addition, a groundwater sample was collected at each location to evaluate parameters that are
indicative of natural attenuation. These parameters included T, pH, SC, oxidation/reduction
potential ("Eh"), dissolved oxygen ("DO"), ferrous iron ("Fe +2°), chloride ("Cr°), alkalinity,
nitrate ("N04"), and sulfate ("S04"). For quality assurance/quality control ("QA/QC") purposes,
a matrix spike/matrix spike duplicate ("MS/MSD") sample was collected at MW-6; a duplicate
sample was collected at MW-9; and an equipment blank and trip blanks were utilized.
Analytical results for VOCs for temporary monitoring well ATW-203 indicated detectable
concentrations of chloroform, tetrachloroethene and trichloroethene above the 2L Standard
(Table 4-15). Laboratory results for metals indicated detectable concentrations of barium and
hexavalent chromium. The only VOC detected from ATW-202 was chloroform
Laboratory results for metals for Geoprobe® sample APH-04 indicated detectable concentrations
of barium, chromium and vanadium (Table 4-16). VOCs and SVOCs were not detected in the
groundwater sample collected from the former on-Site supply well (ESW-1 ).
VOC analysis of the water sample from monitoring well AMW-101 detected concentrations of
13 compounds above the 2L Standard, among them 1,1-dichloroethene (7,400 µg/L), carbon
tetrachloride (75,000 µg/L), methylene chloride (10,000 µg/L), chloroform (22,000 µg/L) and
tetrachloroethene [24,000 µg/L (Table 4-15)]. In addition, barium, chromium, hexavalent
chromium, vanadium and iron were detected in the sample (Table 4-16).
The Monitoring Well MW-3 sample contained 10 VOCs, 7 of which exceeded the established 2L
Standard. Monitoring well MW-6 had five VOCs, 4 of which exceeded the 2L Standard. The
Monitoring Well MW-9 sample contained 11 VOCs, eight of which exceeded the 2L Standard.
The Monitoring well MW-10 sample contained 5 VOCs, 4 of which exceeded the 2L Standard.
4-29
S:\l 354\PROJECT\1997\97-17 SA AquAir II\Rl Report\Rl Chapt 4 -02.doc
Table 4-15
DETECTED VOLATILE ORGANIC COMPOUNDS
SHALLOW AQUIFER GROUNDWATER SAMPLES
AQUAIR SITE, CHARLOTTE, NORTH CAROLINA
S&ME Project No. 1354-97-175
GROUNDWATER MONITORING WELLS
Volatile Organic Compound AMW-101 ATW-202 ATW-203 MW-10
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
1,1,1-Trichloroethane 3,800 ND ND 14
1,1,2,2-Tetrachloroethane 28 ND ND ND
1,1,2-Trichloroethane 18 ND ND ND
1,1-Dichloroethane 750 ND ND ND
1,1-Dichloroethene 7,400 ND ND 77
1,2,4-Trichlorobenzene 10 ND ND ND
1,2-Dichlorobenzene 8.3 ND ND ND
1,2-Dichloroethane 650 ND ND ND
Benzene 5.4 ND ND ND
Carbon Tetrachloride 75,000 ND ND ND
Chlorobenzene 1,000 ND ND ND
Chloroform 22,000 14 6.7 140
Chloromethane 37 ND ND ND
cis-1,2-Dichloroethene 450 ND ND ND
Methylene chloride 10,000 ND ND ND
m-Xylene and p-Xylene 48 ND ND ND
o-Xylene 19 ND ND ND
Tetrachloroethene 24,000 ND 22 51
Toluene 340 ND ND ND
trans-1,2-Dichloroethene 32 ND ND ND
Trichloroethene 6,000 ND 6.6 6
Vinyl Chloride 19 ND ND ND
TOTAL voes 151,614.7 14.0 35.3 288.0
Notes: (1) All results are in micrograms per liter (ug/L).
(2) VOCs -Volatile Organic Compounds.
(3) ND -Not Detected.
MW-3 MW-6
310 16
41 ND
ND ND
5.2 ND
1,200 15
ND ND
ND ND
6.8 ND
ND ND
360 17
ND ND
100 ND
ND ND
8.8 ND
ND ND
ND ND
ND ND
1,100 10
ND ND
ND ND
1,100 45
ND ND
4,231.8 103.0
(4) 2L Standard -North Carolina 15A NCAC 2L Groundwater Quality Standard.
(5) NS -No 2L Standard.
(6) 6,000 -Concentration exceeds 2L Groundwater Standard.
S:\1354\Project\97-175 A\Rl Report\Tables\S&ME SSI GW VOC Summary Tables 4· 15 & 4-17.x:ls\Table 4-15
MW-9
130
ND
ND
7.9
300
ND
ND
540
ND
12,000
91
1,400
ND
47
590
ND
ND
2,200
ND
ND
720
ND
18,025.9
2 L Standard
200
NS
NS
700
7
NS
620
0.38
1
0.3
50
0.19
NS
70
5
530
530
0.7
1000
70
2.8
O.o15
Page l
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
A number of metals were detected in the monitoring well samples. Varying concentrations of
barium, chromium and vanadium were detected in groundwater samples collected from MW-3,
MW-6, MW-9 and MW-10. Chromium was not detected, however, in the MW-6 sample.
Table 4-16 GROUNDWATER SAMPLE INORGANIC ANALYTICAL RESULTS
AQUAIR-CHARLOTTE, NC
S&ME PROJECT NO. 1354-97-175
Sample Barium Chromium Hex. Iron Lead Vanadium Hardness TOC
Chromium
AMW-101 0.63 3.4 3.7 100 ND 0.25 610 16
ATW-202 0.077 ND ND NA ND ND NA NA
ATW-203 0.093 ND 0.029 NA ND ND NA NA
APH-04 0.35 0.031 ND NA ND 0.13 NA NA
MW-3 0.40 0.013 ND NA ND 0.1 NA NA
MW-6 0.21 ND ND NA ND 0.02 NA NA
MW-9 0.56 0.013 ND 84 ND 0.14 260 6.0
MW-9 (dup) 0.75 0.016 ND 120 ND 0.19 330 5.6
MW-10 0.36 0.013 ND NA ND 0.071 NA NA
Note: ND -Not Detected; NA -Not Analyzed; All results are mg/L
The concentrations of Cr (3.4 mg/L) and Hex Cr (3.7 mg/L) detected in the groundwater sample
collected from AMW -101 are very similar indicating that most of the Cr is in the hexavalent
state.
4.6.2 Bedrock Aquifer Groundwater Investigation
Assessment of the Bedrock Aquifer consisted of the drilling, testing, and discrete-interval
sampling of four Type III geologic test boreholes (ATB-01 through ATB-04); ATB-01 was 250
feet deep and the other 3 boreholes were 150 feet deep. A double-cased, shallow-bedrock, Type-
4-31
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RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
IV monitoring well (ATB-05) was installed to 62 feet to monitor a 72-hour aquifer (pump) test
that was performed at ATB-02 (Figure 4-4).
Test Borehole ATB-01 was videotaped and geophysically logged on February 24, 1997 by EGIS,
Inc. ("EGIS") of Chapel Hill, North Carolina, and Test Boreholes ATB-02 and ATB-03 were
videotaped and logged on May 21, 1997. The downhole video camera was used to photograph
geologic conditions within the borehole, i.e. :fracture locations and characteristics, and water
bearing zones. Geophysical logging consisted of caliper, temperature, differential temperature,
natural gamma, spontaneous potential, resistivity, and fluid resistivity.
S&ME's assessment of the Bedrock Aquifer included discrete-interval sampling of four Type-III
geologic test boreholes (ATB-01 through ATB-04 (Figure 4-4). Laboratory analytical results for
groundwater discrete-interval samples detected numerous voe compounds at multiple intervals
in bedrock test boreholes ATB-1 through ATB-03.
Discrete-interval samples collected from ATB-04 did not detect VOCs. The laboratory results
for VOC analyses are summarized in Table 4-17. Values appearing in bold in Table 4-18 exceed
the 2L Standard.
Five samples were collected from Borehole ATB-01. VOCs were detected in the 200-foot
sample, but are believed to have originated from groundwater sinking in the borehole from
shallower :fractures because no recharge was observed below 150 feet. Total VOC
concentrations increased downward from 10.2 mg/L to 122.7 mg/Lin the groundwater samples
collected from the four fracture zones above 125 feet BLS. VOCs with average concentrations
greater than 1.0 mg/L included CF (32.4 mg/L), CT (14.4 mg/L), MC (4.5 mg/L), and PCE (1.3
mg/L).
Five samples were collected from Borehole ATB-02. In general, total VOC concentrations
increased downward from 30.1 mg/L to 39.3 mg/Lin the groundwater samples collected from
the five fracture zones above 130 feet BLS. VOCs with average concentrations greater than 1.0
4-32
S:\1354\PROJECTll 997\97-l 75A AquAir 11\RI Report\Rl Chapt 4 -02.doc
Sample
Depth Benz CDisul
42 -52 ND ND
58-68 ND 0.19
83 -93 ND 0.64
109 -119 ND 1.1
32 0.0075 <0.5
50 0.0091 0.31
89 0.0088 0.32
119 <0.05 0.37
128 <J < 1
34 < 0.012 <0.0125
54 <0.005 0.0087
66 < 0.005 0.0079
134 <0.005 < 0,005
Notes:
Table 4-17
Selected Bedrock Well Groundwater Sample VOC Data
AquAir Site -Supplemental Site Investigation
S&ME Project No. 1354-97-175
Method 8260 Organic Compound
CTet C-form C-benz 1,1-DCA 1,2-DCA 1,1-DCE c-1,2-DCE t-1,2-DCE MChlor Toi 1,1,1,2-PCA 1,1,2,2-PCA PCE 1,1,1-TCA
Bedrock Test Borehole ATB -01
1.6 4.7 0.055 ND 0.17 ND ND ND 0.71 ND ND ND
4.8 13 ND ND ND ND ND ND 2.3 ND ND ND
18 35 0.16 ND ND ND ND ND 5.1 ND ND ND
33 77 0.31 ND 0.18 ND ND ND 10 ND ND ND
Bedrock Test Borehole ATB -02
1.2 18 0.32 0.059 1.3 < 0.25 0.18 0.0054 3.8 0.38 0.013 < 0.005
2 25 0.27 0.042 1.5 0.046 0.21 0.0054 4.7 0.35 < 0.005 O.ot8
1.9 27 0.25 0.045 1.6 0.045 0.21 0.0054 3.9 0.34 <0.005 0.016
1.6 30 0.28 <0.05 1.7 <0.05 0.25 <0.05 3.7 0.47 <0.05 <0.05
1.8 26 <l < 1 1.5 <I <I <l 4.6 <l <l < 1
Bedrock Test Borehole ATB-03
<0.012 0.39 <0.012 <0.012 <0.012 <0.012 <0.012 <0.012 0.085 <0.012 <0.012 <0.012
<0.005 0.4 0.01 < 0.005 0.076 0.0074 < 0.005 < 0,005 0.066 0.0071 < 0.005 < 0.005
< 0.005 0.31 0.0099 <0.005 0.007 0.0085 <0.005 <0.005 0.059 0.0085 <0.005 <0.005
< 0.005 <0.005 0.013 <0.005 O.ot <0.005 < 0.005 < 0.005 0.11 0.0094 < 0.005 < 0.005
(I) Analyses perfonned by PACE Analytical Services, Inc., of Huntersville, NC.
(2) Results are in milligrams per liter (mg/L), parts per million.
(!2) PCE -Tetrachloroethene.
(13) TC A -Trichloroethane.
( 14) T C E -Trichloroethene.
(15) c -cis.
(3) VOCs -Volatile organic compounds.
( 4) Sample Depth -Feet below land surface.
(5) C Disul -Carbon disulfide.
(6) C Tet -Carbon tetrachloride.
(7) C-fonn -Chlorofonn.
(8) C-benz -Chlorobenzene.
(9) D CA -Dichloroethane.
(10) D C E -Dichloroethene.
(11) M Chlor -Methylene chloride.
(16) t -trans.
(17) Toi -Toluene.
( l 8) Benz -Benzene.
(19) PC A -Tetrachloroethane.
(20) m/p-Xyl -m-and p-Xylenes.
(21) < -Less than.
(22) N D -Not detected.
2.1 0.1
0.7 ND
1.2 ND
1.1 ND
3.6 < 0.25
3.4 0.13
3.6 0.12
2.4 0.14
4.3 < l
0.13 <0.012
0.12 < 0.005
0.1 < 0.005
0.097 <0.005
S:ll 354\Projcct\97-175 A \RI Repon\S&ME SS! GW VOC Summary Tables 4-15 & 4-17 .xis\ Table 4-17
Total
1,1,2-TCA TCE mlp-Xyl voes
ND 0.72 ND 10.155
ND 0.2 ND 21.19
ND 0.22 ND 60.32
ND ND ND 122.69
0.026 1.2 < 0.005 30.0909
0.026 1.1 0.0052 39.1217
0.025 1.1 < 0.005 40.4852
< 0.05 0.93 <0.05 41.84
<0.1 1.1 <I 39.3
<0.012 0.028 <0.012 0.633
< 0.005 0.032 < 0.005 0.7272
< 0.005 0.033 < 0.005 0.5438
<0.005 0.019 < 0.005 0.2584
Page I
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
mg/L include chloroform (25.2 mg/L), Methylene Chloride MC (4.2 mg/L), PCE (3.5 mg/L),
Carbon Tetrachloride ("Carbon Tet") (1.7 mg/L), 1,2-DCE (1.5 mg/L), and TCE (1.1 mg/L).
Benzene and toluene were detected in some samples at concentrations less than 0.05 mg/L.
Similar results were detected in the three samples collected during the pump test at ATB-02
(Table 4-17). Toluene, however, was present in the initial sample at a concentration of 5.6 mg/L,
but then reduced to levels similar to those (<1.0 mg/L) detected in the discrete-interval samples
collected from ATB-02.
Total VOC concentrations detected in the four discrete-interval samples collected from ATB-03
were all less than 0.75 mg/L. Concentrations were constant in the samples collected from the
four fracture zones above 140 feet BLS. CF and PCE were present at the highest average
concentrations.
4.6.3 Surface Water and Sediment Sampling
Three sets of surface-water and sediment samples were collected from the Unnamed Creek on
February 25, 1997 (Figure 4-5). Samples SW-1 (surface water) and SED-1 (sediment) were
collected upstream of the anticipated groundwater discharge point; SW-2/SED-2 were collected
near the central portion of the discharge point; and SW-3/SED-3 were collected downstream of
the discharge point. These samples were analyzed for VOCs and metals.
VOCs were not detected in any surface-water sample. The only metal detected was barium at
concentrations of 0.058, 0.05, and 0.049 mg/Lin samples SW-1, SW-2, and SW-3, respectively.
4-34
S:\1354\PROJEC1\1997\97-l 75A AquAir 11\RJ Report\Rl Chapt 4 -02.doc
I
AQUAIR
FACILITY
Jilc1
SAii NE£L Y ROMI
FORMER
LABORATORY
BUILDING
GRAPHIC SCALE
JCUMM
I
,'::::-SE~R
I
I
120 0 Cl() 120 240 ~~~---=--~-~-! '---·' ( IN FEET )
/
0SED2
~-5
• SED-6
0
SE0-4
\ SW-1 ~1
-------'ie.----· ""'..... . . / UNNAMED CREEK
• SED-7
SEWER LEGEND
~ WATER SUPPL y WELL I + SURFACE WATER AND SEDIMENT SAMPLE:
:. S&ME SOIL OR SEDIMENT SAMPLE
• G&M SOIL SAMPLE
0 DEL TA SOIL OR SEDIMENT SAMPLE
\.~w-3 ~ED-3
SCALE:
E
SOSL, SEDIMENT, AND SURFACE WATER
SAMPLING LOCATIONS
AQUAIR SITE
CHARLOTIE. NORTH CAROLINA
DRAYM BY: MFP Ct!ECKEO BY:
AS SHOWN
JOB NO. DAlE: AGllRE NO.
1354-97-175 10-2-97 4-5
RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
No VOCs were detected in sediment samples SED-1 through SED-3, which were collected from
the creek. The metals concentrations in the sediment samples are below projected levels that
would require action. Table 4-18 summarizes the metals analytical results for the sediment
samples.
4.6.4 Soil and Sediment Sampling
Nine hand-auger boreholes were drilled in the area of the suspected drain field on February 25,
1997. The drain field was believed to be located approximately 100 feet east of the septic tank.
Hand-auger refusal in silty sand was encountered in the boreholes at depths ranging from 2.5 feet
to 4 feet BLS. No odors or leach field materials (i.e. gravel) were encountered in any of the hand
auger boreholes. These soil samples were screened in the field with a total vapor analyzer
("TVA").
Since a drain field was not found, the septic tank was then suspected to be a dry well (i.e. drain
downward, rather than outward). A soil sample (APH-03) was collected from a depth of 4 to 8
feet BLS adjacent to the septic tank (eastern side) using the Geoprobe® (Figure 4-5). The soil
sample was analyzed for voes, SVOC's, and metals. VOes or SVOes were not detected in the
sample. Barium (130 mg/kg), chromium (32 mg/kg), hexavalent chromium (1.4 mg/kg), and
vanadium (49 mg/kg) were, however, detected in the sample.
The metals concentrations in the sediment samples SED-4 through SED-7 are below project
levels that would require action. The lead concentration in SED-5 is, however, above EPA's
guideline for lead in soil. EPA's concentration is 400 mg/kg, but is based upon a residential
exposure scenario, which is not a probable scenario for the Site.
4-36
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RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Table 4-18 SEDIMENT SAMPLE METALS ANALYTICAL RESULTS
AQUAIR SITE -CHARLOTTE, NORTH CAROLINA
S&ME PROJECT NO. 1354-97-175
Sample Barium Cadmium Chromium Lead Vanadium
SED-1 570 2.1 40 25 110
SED-2 230 5.4 73 30 330
SED-3 84 1.2 30 24 82
SED-4 49 8.0 110 97 430
SED-4 (dup) 66 11 160 110 680
SED-5 160 170 1400 440 1000
SED-6 100 2.4 63 40 130
SED-7 150 1.6 29 31 90
Note: All results are mg/kg
4.6.5 Waste Classification Sampling
Samples of the concrete pad of the former production building, and the soil beneath the pad,
were collected for analysis by Toxic Characteristic Leaching Procedure ("TCLP") to determine if
the material was a hazardous waste for disposal purposes. Six samples were collected (TCLP-1
through TCLP-6) from in and adjacent to the building (Figure 4-5). Samples 1 through 5 were
concrete samples and sample TCLP-6 was a soil sample.
Test pits were subsequently excavated along the eastern and northern ends of the septic tank to
identify lateral drain lines. The test pits were performed on February 27, 1997. The depth of the
test pits was approximately nine feet. Outlet drain lines were not observed in either test pit.
Four sediment samples, SED-4 through SED-7, were collected from surface-water runoff
features down-slope of the former production building. The sample locations are shown in
4-37
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RI REPORT -CHAPTER 4
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Figure 4-5. The sediment samples, a duplicate sample, and an MS/MSD sample were analyzed
for metals.
Table 4-19 CONCRETE/SOIL SAMPLE TCLP RESULTS-DETECTED CONSTITUENTS
AQUAIR SITE -CHARLOTTE, NORTH CAROLINA
S&ME PROJECT NO. 1354-97-175
Sample Arsenic Barium Benzene Chromium
Regulatory Level 5.0 100.0 0.5 5.0
TCLP-1 ND 0.23 ND 0.058
TCLP-2 ND 0.13 ND 0.028
TCLP-3 ND 0.49 0.088 1.6
TCLP-4 0.008 0.28 0.096 29.0
TCLP-5 ND 0.38 ND 0.024
TCLP-6 ND 0.42 ND ND
Note: All results are mg/L. ND -Not Detected
The TCLP results indicate that a portion of the slab around TCLP-4 will probably have to be
managed as hazardous waste. This sample was located outside of the building on the concrete
pad.
In addition, a sample of soil from beneath the slab at location 2 and the soil sample at location 6
were analyzed for VOCs, SVOCs, and metals. The detected constituent concentrations in the
two soil samples were not at levels that require further investigatiol} or action.
Vanadium pentoxide catalyst pellets were observed on the ground surface at the Site in four
general areas. These areas include two locations east of the Facility fence, along the fence in the
southeastern portion of the Facility and north and west of the former lab building.
4-38
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RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
5.0 HYDROGEOLOGIC SETTING
The geology and hydrology of the AquAir Site and the general area are discussed in this chapter.
5.1 REGIONAL HYDROGEOLOGY
The Site is located within the Piedmont Physiographic Province of North Carolina. The Piedmont
is characterized by rolling hills with moderate slopes.
The topography of the Piedmont has developed on an uplifted, submaturely-to maturely-dissected
region of igneous and metamorphic bedrock from differential weathering of the bedrock. Ridges
and hills have developed over the more resistant rock, whereas, gently rolling, subdued topography
has developed on the more easily weathered and erodible rock. The underlying bedrock and
structural features have controlled the development of dendritic and trellis (fractured controlled)
stream-drainage patterns.
5.1.1 Geology
Massive crystalline igneous rocks (formed from the cooling of molten rock mass) and metamorphic
rocks (formed by heat, pressure and/or chemical action) rocks underlie the Piedmont. Piedmont
bedrock, formed during the Precambrian and Paleozoic Eras, are further divided into lithotectonic
belts. The site is located in the Charlotte lithotectonic belt.
The Charlotte belt is dominated by metamorphosed plutons but contains some metavolcanic rocks
(Goldsmith, Milton and Horton, 1988). The top of bedrock is generally encountered within 15 to 60
feet of land surface in the area of the site, and has been observed at land surface in several areas in
the vicinity of the site.
5-1
S:\1354\PROJECT\l 997\97-175A AquAir Il\Rl Report\Rl Chapt 5 -02.doc
RI REPORT-CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Because of continued weathering, rock in the Piedmont Province is now generally covered with a
mantle of soil that has formed from the in-place (in situ) chemical weathering of the parent bedrock.
The soils that overlie bedrock have variable thickness, and are generally referred to as residuum
(residual soils) and saprolite.
Residuum is typically finer grained, has a higher clay content, and retains less of the original rock
and mineral structure than the underlying saprolite because of the advanced weathering. Similarly,
the soils typically become coarser grained with increasing depth because of decreased weathering.
As the degree of weathering decreases, residuum grades into saprolite, which generally retains the
overall appearance, texture, gradation, foliation and structure of the parent rock. Saprolite generally
grades into partially weathered rock ("PWR") and :fractured rock with increasing depth as the
unweathered bedrock is approached.
The bedrock beneath the Site consists of a metamorphosed gabbro, identified as part of the Gabbro
of Concord Plutonic Suite. In the area of the Site, layers and/or boulders of unweathered bedrock
have been observed within the unconsolidated soils above the bedrock. The size and depth of these
boulders varies across the Site.
Generally, the upper 5 to 10 feet of the competent bedrock are moderately to highly :fractured, with
fractures decreasing with depth. Joint patterns measured in rock outcrops in the area of the Site
indicate fractures striking from E-W to N50W, with two predominant joint patterns striking N22-
26E and N70-75E. Dip angles along these joints ranged from 40 degrees to vertical, with the
predominant dip direction to the north.
The underlying bedrock, gabbro, generally weathers to a stiff, plastic clayey soil, up to a few feet in
thickness, grading to more permeable, sandy soils with depth. In some areas, the sur:ficial soil is a
gray, very stiff and plastic clay that is locally referred to as "Bull Tallow".
More permeable soils generally exist at the top of the bedrock, where the chemical and physical
weathering of the rock has produced a porous and permeable silty sand. This zone is typically the
5-2
S:\ I 354\PROJECT\1997\97-17 5A AquAir 11\RI Report\RI Chapt 5 -02.doc
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
most permeable of the subsurface materials, and as a result, is highly conducive to groundwater (and
contaminant) flow.
5.1.2 Groundwater Hydrology
Groundwater generally occurs within the residuum and saprolite (Shallow or Surficial Aquifer)
under water-table (unconfined) aquifer conditions. The saprolitic soils typically have high
porosities but low permeabilities and therefore, generally store a large volume of groundwater that
is not, however, readily transmitted. The saprolitic soils are considered leaky, semi-permeable
aquifers, which generally store water from precipitation and recharge groundwater (downward
infiltration) to the underlying bedrock.
Groundwater in the Bedrock Aquifer is present generally in fractures and is under generally semi-
confined (semi-artesian) aquifer conditions. The Bedrock Aquifer is heterogeneous and anisotropic.
The extent, orientation, and degree of interconnection of the fractures control groundwater flow
within the Bedrock Aquifer.
The movement of groundwater is strongly influenced by fractures, joints, and topography.
Typically, movement is from areas of recharge (topographic highs) to discharge areas (topographic
lows). In the Piedmont, the direction of groundwater flow in the Shallow Aquifer tends to be
subparallel to topography. Groundwater flow in the Bedrock Aquifer is more complex, but also
tends to mimic the topographic slope.
5.2 SURFACE-WATER HYDROLOGY AND SITE DRAINAGE
Major surface water drainage systems in the area include Steele Creek, Sugar Creek and the
Catawba River. Sugar Creek and its tributaries, which includes the intermittent stream, the
Unnamed Creek, on the Property, flow in predominately a north-south direction. Many of the
smaller stream tributaries of Sugar Creek are generally oriented in an ahnost east-west direction.
5-3
S:\1354\PROJEC1\1997\97-175A AquAir II\RI Report\RI Chapt 5 -02.doc
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Erosional channels often develop along :fractures and joints. Therefore, it is possible that an
orthogonal joint set exists in the bedrock oriented N-S and E-W.
The Unnamed Creek is the primary surface-water feature at the Site. The stream flows eastward
from Valmet Industries and enters the property in the central portion of the western boundary
(Figure 5-1). The stream passes under the Norfolk Southern Railroad track near the center of the
Site and exits the Site near the south-central part of the eastern border.
Constant base flow in the stream was observed in 1997 and 1998. Intermittent flow began in
1999, and by 2000 flow had ceased except following heavy rains. Long term deficit rainfall in
the area has apparently eliminated base flow in the stream.
An incised drainage ditch is located along the western side of a portion of the Norfolk Southern
Railroad track. Standing water was present in the deeper portions of the ditch until 2000.
Rainfall runoff at the Site follows topography. Runoff travels by sheet flow from the elevated
areas in the southern and northern portion of the Site toward the Unnamed Creek. The railroad
track is bermed four to eight feet above grade through the Site and diverts runoff coming from
the Former Facility to the southeast before gaining access to the stream.
5.3 SITE GEOLOGY
Geologic test drilling was performed at 10 locations during the RI and groundwater monitoring
wells were installed in the Shallow Aquifer. Twelve test boreholes were drilled into bedrock;
nine boreholes were completed as single monitoring wells and one borehole was completed as a
dual monitoring wells. The locations are shown on the Figure 5-2. The test borehole logs and
well construction details presented in Appendix II.
5-4
S:\1354\PROJECT\1997\97-175A AquAir II\RI Report\RI Chapt 5 -02.doc
,I C'(
"'"·~-~.
SCALE: 1" =l,210'
CHECKED BY: CTL
DRAWN BY: JLC
DATE: 09/02/01
.SIME .
ENvlRONMENiA. SE=\'vCES. :)~cn-.Ernlf\G. -~STlf\C
SURFACE WATER AND DRAINAGE
AUQAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NC
JOB NO. 1354-97-175 A
' Runoff
Direction
FIGURE NO.
5-1
NORFOLK SOUTHERN RAILROAD ---
AQUAIR
FACILITY
FORMER
LABORATORY
BUILDING
+ AMW-106
~DW-1 Mw-a--r= I MW-10* _,_,___,.___,.._,. ~--t
ESW-01 \l
r"~ --~.-J L ow-4@.+T2 _SAM_Nm:_Y_llOAD___,~ .. ~ .. ~ ~
1 FORMER~ fLil A Am!o1.
1
PRODUCTION j ---4-BUILDI~--· .~J ! t AJw-101
MW-4+ \ j ! L_,_____ l r--·.. I + I .~-~> (
AMW-411 f !
(ATB-11) I SVE-!
L..--'f:--~· J
"tw-s
GRAPHIC SCALE
120 0 00 120 240 ~r::..-~-~-~-~-1 1-------1!
( IN l'DT)
CMUD SEWER
+ AMW-410
(ATB-10)
"tw-1
\ /UNNAMED . CREEK
""'
+ AMW-405
(ATB-04)
AIB-02 + RW-1
DW-3
~-6• + AMW-403&:AMW-503
(ATB-03)
595.12 +
AMW-612
(ATB-12)
+ AMW-102
AMW-109
AMW-101r +
ATB-06
\
SCAl.f:
+ AMW-108
AMW-107
+ AMW-606
(ATB-08)
+ ff/ AMW-607
4J (ATB-07) u i--~~~~..;.,_~..:.,_~~~~~..L-~
~ LEGEND
WATER SUPPLY WELL
O DEL TA UPPER BEDROCK WELL
~ DELTA SHALLOW WELL
-.101 S&ME SHALLOW WELL + S&ME BEDROCK TEST + BOREHOLE/MONITORING WELL
(A'llH)4) "T S&ME BEDROCK TEST BOREHOLE
+ AMW-404
(ATB-04)
.· E ENVIRONMENTAL SERVICES ENGINEERING · TESTING
WELLS AND TEST BOREHOLES
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
ORA~ BY; MFP CHECKED BY:
AS SHOWN
JOB NO. DA lE: AGUR£ NO.
1354-97-175A 11-07-00 5-2
______________________________ ... _,_ ...... ·-···
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
The monitoring wells and bedrock test boreholes were located in the field by S&ME personnel
using existing Site topography and landmarks as references. DS Atlantic, Inc. of Charlotte,
North Carolina then surveyed each monitoring well and bedrock test borehole location for
horizontal and vertical control.
The shallow monitoring well boreholes were extended to depths ranging between approximately
15 feet to 47 feet BLS with hollow-stem, continuous-flight augers. The bedrock test holes were
extended to depths ranging between approximately 150 feet to 250 feet BLS. The bedrock test
holes were constructed with six-inch-diameter steel casing from ground surface to approximately
1 O feet into competent bedrock. The borehole is nominal six-inch-diameter below the surface
casmg.
In general, five lithologies are present and include, in descending order, soil, residuum (residual
soiVclay) or Bull Tallow clay, saprolite, weathered rock, and unweathered bedrock. The contacts
between the different lithologies are gradational over a few inches to several feet. Residuum is
present mostly in the upland areas of the Site southwest of the Former Facility and northeast across
the Unnamed Creek. Bull Tallow is principally present in the low-lying areas bordering the creek.
Residuum and Bull Tallow clay are the result of complete in-place weathering of the parent
bedrock. The residuum consists of mainly of clayey, sandy silt and is typicalL Y reddish orange to
reddish brown in color and does not contain any relic structure of the parent bedrock. Bull Tallow
has a similar makeup but with more clay and is medium to dark gray.
Saprolite was encountered throughout the Site. The saprolite was typically sandy silt to silty sand
and contained relic structures of the parent gabbro bedrock. In general, the Saprolite coarsened
downward. The saprolite was typically mottled brown, red, and tan to white.
5-7
S:\1354\PROJECT\1997\97-17 SA AquAir II\RI Report\Rl Chapt 5 -02.doc
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
5.3.1 Geologic Sequence
October 2001
S&ME Project No. 1354-97-175 A
Two primary geologic zones were identified at the Site based on the test borehole logs. These
zones were identified based on visual classification of the geologic material encountered and
performance of the drilling equipment. The two zones are identified as the Saprolite/Residuum
Unit and Bedrock. Partially weathered rock ("PWR") is present on top of bedrock throughout
the Site and forms a transitional unit between bedrock and the overlying saprolite.
5.3.1.l Saprolite Unit
The Saprolite/Residuum Unit consists of residual soil (residuum) or Bull Ta
downward into saprolite. Partially weathered rock was encountered from J
Auger refusal was encountered at depths of approximately 35 feet near the Fe
to 15 feet BLS in the eastern portion of the Site, between the Unnamed Cre
track.
Saprolite is the result of less complete in-place weathering of the parent bee
rock features are identifiable. The saprolite generally coarsens downward to PWK on tup u.L
bedrock grading from a sandy silt to a silty sand.
5.3.1.2 PWR
Partially weathered bedrock was present throughout the Site. PWR was identified when auger
refusal occurred. PWR is approximately four to six feet thick based on air-rotary drilling
information except at AMW-405 where as much as 20 feet were present.
5-8
S:\l 354\PROJECT\1997\97-l 75A AquAir II\Rl Report\Rl Chapt 5 -02.doc
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
5.3.1.3 Bedrock
October 2001
S&ME Project No. 1354-97-175 A
Based on air-rig cuttings and borehole video, bedrock appeared to be mainly comprised of gabbro.
The gabbro generally consisted of coarse-grained pyroxene and olivine, and was dark gray speckled
with lighter colored plagioclase feldspar. Depth to bedrock at the Site ranged from approximately
20 to 40+ feet BLS.
Numerous fractures were encountered in all the bedrock test boreholes. The fractures varied from
nearly horizontal to high angle. Maximum fracture apertures were two to three inches. A large
apparent cavity was encountered at ATB-03 at a depth of 65 feet BLS where several fractures
intersected.
5.4 GROUNDWATER HYDROLOGY
Groundwater generally occurs within the residuum and saprolite under water-table aquifer
(unconfined) conditions. Because of the heterogeneous texture and structure of saprolite,
alternating layers with different moisture content are common. The residuum and saprolite
typically have a high total porosity, but a low permeability. Therefore, these soils store water
from precipitation and slowly recharge the underlying Bedrock Aquifer by downward
infiltration.
Groundwater occurs in the bedrock along fractures, joints and other opemngs created by
structural movement and weathering. The groundwater surface may occur within the bedrock
when the bedrock is relatively close to the ground surface. Within the Piedmont, low
permeability units or aquitards do not typically exist that would result in a confining layer
hydraulically separating the bedrock from the overlying soils. Thus, the soils and bedrock are
generally hydraulically connected. Groundwater generally flows from recharge areas
(topographic highs) to discharge areas (streams and springs).
5-9
S:\1354\pRQJEC1\J 997\97-175A AquAir Il\RI Report\Rl Chapt 5 -02.doc
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
5.4.1 Hydrogeologic Sequence
October 2001
S&ME Project No. 1354-97-175 A
The Shallow Aquifer is present in the Saprolite/Residuum Unit throughout the Site and is under
water table conditions. The Bedrock Aquifer is under water-table to semi-artesian aquifer
conditions throughout the Site. PWR forms a transition zone between the two units.
5.4.2 Shallow Aquifer
Twenty monitoring wells have been installed to monitor the Shallow Aquifer at the Site. Delta
installed wells MW-1 through MW-10 in 1992 prior to the RI. S&ME installed 10 wells (AMW-
101 through AMW-110) during the RI.
The configuration of the groundwater surface in the Shallow Aquifer on October 26, 2000 is
presented in Figure 5-3. Groundwater-level data is presented in Table 5-1. In the area of the
Former Facility, flow in the Shallow Aquifer is to the east-northeast toward the Unnamed Creek.
Groundwater elevations range from approximately 602 feet NGVD to 590 feet NGVD; relief is
approximately 12 feet. Groundwater gradients are fairly uniform between the Former Facility
and the Unnamed Creek. The aquifer is recharged in the upland areas on Site to the southwest
and northeast. The aquifer discharges to the Unnamed Creek.
Groundwater levels have declined as much as 16 feet at the Site since Delta's initial water-level
measurements in September 1992 due to the long-term rainfall deficit. Selected hydrographs of
groundwater-level data are presented in Appendix V. Seasonal groundwater-level fluctuations
have been generally in the range of three to eight feet.
5-10
S:\1354\PROJECT\1997\97-175A AquAir II\Rl Report\Rl Chapt 5 -02.doc
i
i· 8 r
*
!
I ~ i:: ,.
i ;;
i a
NORFOLK SOUTHERN RAILROAD ----. CREEK \ /UNNAMED
-+@DW-1
MW]!Q1.35
CD 0 N
.+7.5
AMW-106
I -10• DRY
L---~·-,_,,_ ........... ...........-r--, I
I
599._lO
""t4w-5
GRAPHIC SCALE
120 0 00 120 240
( IN Fm' )
CMUD SEWER
i)97.63
Tw-J•
OI
fO
CD
DW-2
596.62-! •
DRl_
MW-7
""
+ AMW-405
(AlB-04)
AlB-02 + RW-1
+ AMW-403 & AMW-503
OI .,
CD
(AlB-03)
+ AMW-612
(AlB-12)
AMW-110
+ 592.93
592.87 +
AMW-102
92.27
AMW-109
AMWt509
(AlB-09)
AMW-103
591.60 1r +
AlB-06
\ 59+2
• AMW-108
590.27
AMW-107
+ AMW-608
(AlB-08)
+ tfJ AMW-607
W (AlB-07) u '--------------~---------------------_.___. ~ LEGEND ii WATER SUPPLY WELL
DW-1 DEL TA UPPER BEDROCK WELL @ + DEL TA SHALLOW WELL
__ ,01 S&ME SHALLOW WELL + S&ME BEDROCK TEST + BOREHOLE/MONITORING WELL
(A11H14) AT S&ME BEDROCK TEST BOREHOLE
GROUNDWATER ELEVATION 10/26/~)
(FEET ABOVE NGUO) .
-eoo-GROUNDWATER SURFACE CONTOUR LIN
CONTOUR INTERVAL = 2 FEET
+ AMW-404
(AlB-04)
E
SHALLOW AQUIFER GROUNDWATER
CONTOUR MAP 110 ·28•00J
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
SCALE: DRAWN BY: CHECKED BY: AS SHOWN MFP
JOB NO. DAlE: FIGURE NO.
1354-97-175A 11-07-00 5-3
Well
Number
1 AMW-101
2 AMW-102
3 AMW-103
4 AMW-104
5 AMW-105
6 AMW-106
7 AMW-107
8 AMW-108
9 AMW-109
10 AMW-110
11 ATB-01
12 RW-1 (ATB-02)
13 AMW-403
14 AMW-503
15 ATB-04
16 ATB-05
17 ATB-06
18 ATB-07
19 AMW-608
20 AMW-509
21 ATB-10
22 AMW-411
23 AMW-612
Table 5-1
GROUNDWATER LEVEL DATA
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME PROJECT NO. 1354-97-175 A
MP 10/26/00 11/16/00
Elevation DTW Elevation DTW Elevation
614.97 16.88 598.09 17.61 597.36
601.91 9.04 592.87 10.44 591.47
596.87 5.18 591.69 4.68 592.19
599.95 7.33 592.62 7.55 592.40
598.05 5.23 592.82 4.64 593.41
605.47 8.32 597.15 7.72 597.75
594.68 4.41 590.27 4.33 590.35
594.02 3.00 591.02 9.35 584.67
602.87 10.6 592.27 10.55 592.32
602.74 9.81 592.93 11.93 590.81
614.14 16.06 598.08 17.18 596.96
602.61 7.84 594.77 26.30 576.31
606.24 4.11 602.13 15.36 590.88
606.24 11.62 594.62 12.19 594.05
597.00 7.45 589.55 7.39 589.61
602.94 8.72 594.22 10.10 592.84
598.72 6.98 591.74 7.19 591.53
606.98 11.46 595.52 11.70 595.28
609.77 13.96 595.81 14.37 595.40
599.47 7.08 592.39 7.53 591.94
603.47 8.46 595.01 8.05 595.42
621.22 21.99 599.23 22.29 598.93
606.12 11.00 595.12 14.92 591.20
S:\1354\Project\97-175 A\Rl Report\Tables\GW Level Table 5-1.xls.xls 1 of2
09/14/01
DTW Elevation
19.93 595.04
11.45 590.46
8.57 588.30
9.16 590.79
6.55 591.50
10.29 595.18
5.76 588.92
8.28 585.74
12.63 590.24
12.75 589.99
19.29 594.85
26.30 576.31
16.72 589.52
18.59 587.65
8.74 588.26
11.34 591.60
8.38 590.34
13.05 593.93
15.38 594.39
8.61 590.86
10.23 593.24
23.93 597.29
16.56 589.56
24
25
26
27
28
29
30
31
32
33
34
35
36
37
Well
Number
DW-1
DW-2
DW-3
DW-4
MW-1
MW-10
MW-2
MW-3
MW-4
MW-5
MW-6
MW-7
MW-8
MW-9
Table 5-1
GROUNDWATER LEVEL DATA
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, MECKLENBURG COUNTY, NORTH CAROLINA
S&ME PROJECT NO. 1354-97-175 A
MP 10/26/00 11116/00
Elevation DTW Elevation DTW Elevation
617.22 15.74 601.48 15.69 601.53
607.25 10.73 596.52 13.06 594.19
607.98 28.60 579.38 28.61 579.37
619.94 18.77 601.17 19.57 600.37
615.64 16.32 599.32 16.78 598.86
611.68 DRY DRY
615.17 17.16 598.01 17.85 597.32
608.89 11.26 597.63 17.10 591.79
621.62 19.26 602.36 19.50 602.12
615.27 15.97 599.30 16.49 598.78
607.25 11.84 595.41 13.27 593.98
615.08 14.75 600.33 DRY
617.03 15.48 601.55 15.55 601.48
607.15 10.53 596.62 12.72 594.43
Notes: (1) DTW -Depth to Groundwater in Feet.
(2) Elevation -Feet above National Geodetic Vertical Datum.
S:\1354\Project\97-175 A\Rl Report\Tables\GW Level Table 5-1.xls.xls 2 of2
09/14/01
DTW Elevation
17.59 599.63
14.72 592.53
28.20 579.78
21.71 598.23
19.03 596.61
11.46 600.22
20.10 595.07
14.25 594.64
20.88 600.74
18.72 596.55
16.10 591.15
15.05 600.03
17.17 599.86
14.43 592.72
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
5.4.2.1 Permeability
October 2001
S&ME Project No. 1354-97-175 A
During the field exploration in October 1998, in-situ permeability tests with a solid slug and an
In Situ Hermit data-logger/pressure transducer system were performed in one Shallow Aquifer
monitoring well (AMW-101) to characterize the formation permeability (hydraulic conductivity).
Within the saprolite, this permeability is primarily horizontal permeability. The test procedm
and field-test data for the in-situ tests are presented in Appendix III.
During the SSI in February and Marchl997, slug tests were performed in monitoring wells M'
2, MW-6, MW-9, MW-10, and AMW-101. The slug tests were performed by hand bailing·
wells to lower the water level in the wells. The subsequent rise of groundwater in the wells \:
measured at specific intervals by an electronic water level meter.
The slug-test data were used to calculate the hydraulic conductivity near the wells utilizing the
Bouwer and Rice Method. Based on the 1997 tests, the hydraulic conductivity ranges from 3.2 x
10-4 feet per minute ("ft/min") near AMW-101 to 2.1 x 10-3 ft/min near MW-9. The 1998 test of
MW-1 produced hydraulic conductivity of 1.2 x 10·3 ft/min.
5.4.2.2 Horizontal Groundwater Flow
Horizontal hydraulic gradients for the Shallow Aquifer were calculated using the October 26,
2000 groundwater surface map, Figure 5-3. An imaginary line was approximated through each
well located perpendicular to the groundwater equipotential contour lines. For wells located
between two contour lines, the distance from the up-gradient and down-gradient contour lines
was measured. For wells with only one contour line located either up-gradient or down-gradient,
the distance from the well to the contour line was measured. The change in hydraulic head either
between the contour lines or between the well and contour line was divided by the corresponding
distance yielding the hydraulic gradient.
5-14
S:\1354\PROJECT\1997\97-175A AquAir Il\RI Report\RJ Chapt 5 -02.doc
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
The direction of groundwater flow is generally to the east-northeast from the Former Facility
toward the Unnamed Creek. The hydraulic gradient on the groundwater surface between the
Former Facility and the Unnamed Creek was calculated to be 0.009 foot/foot. Using the
hydraulic conductivity from the 1998 slug test at AMW-101 of 1.2 x 10-3 feet per minute, the
hydraulic gradient of 0.009 foot/foot and an assumed effective porosity of 0.20, groundwater-
seepage velocity in the Shallow Aquifer is calculated to be approximately 28 feet per year.
5.4.3 Bedrock Aquifer
Twelve bedrock test boreholes were drilled during the RI at the Site. Eight boreholes were
subsequently converted to monitoring wells. Delta installed four Type III monitoring wells DW-
1 though DW-4) during 1992 to monitor the upper portion of Bedrock Aquifer.
During the field exploration, in-situ specific capacity tests were performed in seven Bedrock
Aquifer test boreholes to characterize the permeability or hydraulic conductivity of the bedrock.
Based on those tests, the permeability of the bedrock at the Site is strongly influenced by
fractures, joints and topography. The results of the field permeability testing are presented in
Table 5-2. The test procedures and field-test data for the in-situ specific capacity tests are
presented in the appendices. In situ permeability tests were also performed in Bedrock Well
AMW-404.
The Bedrock Aquifer is under water-table to semi-confined aquifer conditions at the Site. The
upper part of the aquifer has an upward gradient to the Shallow Aquifer. However, the aquifer
has an over all downward gradient as evidenced from the water-data from wells AMW-403 and
AMW-503 (Table 5-1).
5-15
S:\1354\PROJEC1\l 997\97-l 75A AquAir II\Rl Report\Rl Chapt 5 -02.doc
Test Fracture Zone
Borehole Number Depth
I 266.7-277.7
2 235-246
3 224-235
4 213-224
ATB-06 5 180-191
6 143-154
7 126-137
8 90-101
@(!#Nt:$.t:m 71-80
* 10 50-61
WtNMFMt 187-198
2 175-186
ATB-07 3 118-129
4 77-88
5 66-77
WtMii~WflW 155-166
2 131-142
ATB-08 3 114-125
4 94-105
5 79-90
6 49-60
* 1 138.3-149.3
*2 114.2-125.2
ATB-09 3 92.2-103.2
U!l@:t:Wtl 68.2-79.2
5 54.7-65.7
1 139-150
2 102-113
ATB-10 3 78-89
:m:mrnt::!.f:mm: 55-66
* 5 42-53
Table 5-2
Bedrock Discrete Interval Hydraulic Testing
AquAir Remedial Investigation
Charlotte, Mecklenburg County, North Carolina
S&:ME Project No. 1354-97-175 A
Water Level -Irmer Casing Water Level -Outer Casing
DTW Start DTWEnd ChangeDTW DTWStart DTWEnd ChangeDTW
8.42 39.70 31.28 5.54 16.25 10.71
9.60 68.00 58.40 5.62 6.95 1.33
5.90 39.70 33.80 5.70 12.00 6.30
2.90 54.00 51.10 5.70 12.65 6.95
8.88 46.75 37.87 5.92 10.60 4.68
7.65 49.92 42.27 5.75 9.70 3.95
9.66 46.10 36.44 5.80 9.82 4.02
6.05 41.05 35.00 5.75 10.25 4.50
6.26 36.70 30.44 5.91 8.00 2.09
2.80 45.00 42.20 5.60 ND NIA
12.55 66.20 53.65 5.65 18.74 13.09
3.89 80.00 76.11 3.80 4.80 1.00
7.06 64.80 57.74 8.90 9.10 0.20
12.28 60.40 48.12 13.35 13.73 0.38
-0.25 ND NIA 11.75 ND NIA
15.87 19.10 3.23 11.85 12.91 1.06
12.89 79.00 66.11 10.10 13.80 3.70
7.51 68.00 60.49 11.30 12.90 1.60
12.02 67.50 55.48 11.21 17.65 6.44
11.50 68.00 56.50 11.30 11.45 0.15
9.59 ND NIA 11.23 11.40 0.17
4.62 24.65 20.03 4.24 12.57 8.33
7.30 39.90 32.60 3.90 19.50 15.60
3.85 63.70 59.85 3.15 5.30 2.15
8.31 21.70 13.39 3.26 6.00 2.74
3.66 46.00 42.34 3.15 4.70 NIA
5.66 46.30 40.64 5.42 6.07 0.65
6.90 42.50 35.60 5.40 5.93 0.53
6.42 42.50 36.08 5.43 5.93 0.50
9.51 13.80 4.29 5.51 8.90 3.39
7.55 12.23 4.68 5.50 9.56 4.06
S:\1354\Project\97-175 AIR.I Report\Tables\Fracture Permeability Table 5-2.xls Page 1 of 2
Water Level
Percent Change Flow Rate ( gom) Snecific Caoac.
34.24 1.67 0.05
2.28 E NIA
18.64 1.87 0.06
13.60 E NIA
12.36 1.07 O.Q3
9.34 1.37 O.Q3
11.03 1.58 0.04
12.86 1.00 0.03
6.87 3.33 0.11
NIA E NIA
24.40 2.78 0.05
1.31 E NIA
0.35 E NIA
0.79 E NIA
NIA E NIA
32.82 4.27 1.32
5.60 E NIA
2.65 E NIA
11.61 E NIA
0.27 E NIA
NIA E NIA
41.59 1.00 0.05
47.85 5.00 0.15
3.59 2.50 0.04
20.46 3.66 0.27
NIA E NIA
1.60 2.00 0.05
1.49 2.00 0.06
1.39 2.00 0.06
79.02 5.00 1.17
86.75 5.00 1.07
Test Fracture Zone
Borehole Number Depth
* 1 140.6-151.6
2 130.6-141.6
ATB-11 3 120.6-131.6
HWWW@Mt 78-89
5 67-56
ltl@Wltl 143.4-154.4
2 123-134
ATB-12 3 105-116
4 79-90
5 62-73
*6 47-58
*7 37-48
Table 5-2
Bedrock Discrete Interval Hydraulic Testing
AquAir Remedial Investigation
Charlotte, Mecklenburg County, North Carolina
S&:ME Project No. 1354-97-175 A
Water Level -Inner Casing Water Level -Outer Casing
DTW Start DTWEnd ChangeDTW DTWStart DTWEnd ChangeDTW
16.83 79.10 62.27 17.82 18.23 0.41
17.45 73.22 55.77 18.67 19.22 0.55
18.60 79.23 60.63 19.19 ND NIA
21.35 47.74 26.39 19.65 22.24 2.59
23.18 44.26 21.08 21.17 22.20 1.03
14.70 16.30 1.60 12.26 ND NIA
13.15 36.54 23.39 ND 17.80 NIA
14.22 39.48 25.26 12.27 ND NIA
14.98 33.82 18.84 12.28 19.21 6.93
14.34 36.05 21.71 12.41 20.15 7.74
14.14 26.15 12.01 12.38 24.05 11.67
14.15 23.14 8.99 12.45 18.06 5.61
Notes: E =Column evacuated to depth of pump. For intervals 100 feet and lower, the pump depth is 95 feet.
For intervals above 100 feet, pump depth is 5 feet above top interval.
ND = no data available
NIA= calculation couldn't be made due to lack of data
* = large fractures indicated by caliper log
l!lll!!l!llllllllllill = best producers based on flowldrawdown data and video log info
S:\1354\Project\97-175 A\RI Report\Tab!es\Fracture Permeability Table 5-2.xls Page 2 of 2
Water Level
Percent Change Flow Rate ( gom) Specific Capac.
0.66 E NIA
0.99 E NIA
NIA E NIA
9.81 3.33 0.13
4.89 0.40 0.02
NIA 2.00 1.25
NIA 3.33 0.14
NIA 5.45 0.22
36.78 3.49 0.19
35.65 4.00 0.18
97.17 4.62 0.38
62.40 2.76 0.31
RI REPORT -CHAPTER 5
AQUAIR REMEDIAL INVESTIGATION
5.4.3.1 Horizontal Groundwater Flow
October 2001
S&ME Project No. 1354-97-175 A
The groundwater surface of the Bedrock Aquifer is illustrated in Figure 5-4 for October 26,
2000. Elevations on the surface range from greater than 599 feet NGVD at AMW-411 (ATB-11)
located at the southwestern comer of the Former Facility to approximately 589 feet NGVD at
well AMW-404 (ATB-04) located east of the Unnamed Creek due east of the Former Facility.
Overall relief on the potentiometric surface is approximately eight feet. In general, groundwater
flow in the aquifer is to the east-northeast from the Former Facility toward the Unnamed Creek.
Aquifer flow east of the creek is southwestward. Horizontal hydraulic gradients were calculated
from the groundwater surface map, Figures 5-4, using the technique previously described. The
horizontal gradient is in the range of 0.01 ft/ft between the Former Facility and the Unnamed
Creek. Using the hydraulic conductivity from the 1998 slug test at AMW-404 of 4.9 x 10-3 feet
per minute, the hydraulic gradient of 0.01 foot/foot and an assumed effective porosity of 0.20,
groundwater-seepage velocity in the Bedrock Aquifer is calculated to be approximately 128 feet
per year.
5-18
S:\l 354\PROJECT\1997\97-175A AquAir 11\RJ Report\RJ Chapt S -02.doc
AQUAIR
FACILITY
~DW-1
MW-8,,...... 601.48
NORFOLK SOUTHERN RAILROAD ------
I MW-10* ~.__-~L,__,._t I I I
l . ESW-01 l
1
1 r -~ ~wL -----i.,...._..,_~-·-{ ow-4@j
SAM Nal.Y llOMI )._ l "-QAlE '
f CAtt: FORMER~ jl_fl ~ ATB!o -598.02
O f PRODUCTION ! • -4-
f BUILDI~~---_j I t AJw-101
+ ~ ! ! l
MW-4 I I I l ~----~-+-[~) l + 599.23 t '•
AMW-411 i .....__...,.,__---'
(ATB-11) l SVE-t ~ w-l
i l L--··•-----<>-'~ . ..,_.._,,......._
"tw-5
GRAPHIC SCALE
120 0 flO 120 240 ~f-~---~~~~-'·-'----1 ( JH PUT )
\ /UNNAMED . CREEK
""
+ AMW-410
(AlB-10}
594.22-$-0
DW-2
596.52 '-9•
"tw-7
AMW-405
(ATB-04)
ATB-02
594.77 +
RW-1
DW-594.62+
_?5,9.38 AMW-403&:AMW-3
(ATB-03)
595.12 +
AMW-612
(ATB-12)
AMW-110
-------------------------------------------·-·--·······
592.39+
AMW-509
(AlB-09}
AMW-103 ++ 591.74
ATB-06
+ •
AMW-102
AMW-109
\
\
SCALE:
595.81 + ~-*' AMW-608
... (ATB-08)
AMW-107
+ AMW-607
(ATB-07)
Inf-I
@
+
IOI S&ME SHALLOW
S&ME BEDROCK TES
EHOLE/MONITORING LL
GROUNDWATER VATION 10/26/~)
(FEET ABOVE NGU
GROUNDWATER SURF CE CONTOUR UN
CONTOUR INTERVAL -2 FEET
+ 589.55
AMW-
( A TB-04)
E
BEDROCK AQUIFER GROUNDWATER
CONTOUR MAP 110 •28·001
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
AS SHOWN DRA~ BY: MFP CHECKED BY:
JOB NO. DA TE: AGURE NO.
1354-97-175A 11-07-00 5-4
RI REPORT-CHAPTER 6
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
6.0 SURFACE-WATER, SEDIMENT, AND SHALLOW SOIL CHEMICAL QUALITY
6.1 SURFACE-WATERSAMPLES
Three surface water samples (ASW-01, ASW-02-0199, and ASW-03) were collected from the
Unnamed Creek on January 13, 1999 (Figure 6-1). Negligent flow was present in the creek at
the time of sampling.
Samples ASW-01 was the upstream sample and ASW-03 was the downstream sample. Sample
ASW-02-0199 was collected from a location estimated to be near the center of potential
discharge from the Shallow Aquifer groundwater plume. The samples were analyzed by Pace
for Method 8260 VOCs.
VOCs were not detected in the upstream sample ASW-01. Chloromethane was detected in the
midstream sample (ASW-02-0199) at a concentration of 10 µg/L. Chloroform was detected in
the downstream sample (ASW-03) at a concentration of 10 µg/L.
S&ME previously sampled surface water (SW-1, SW-2, and SW-3) and sediment (SED-1, SED-
2, and SED-3) in the Unnamed Creek at these locations on February 25, 1997 during the SSL
Constant flow was present at that time. The samples were analyzed for VOCs and metals
(barium, cadmium, chromium, hexavalent chromium, and vanadium).
VOCs were not detected in the 1997 surface-water samples. Barium was the only metal detected
in the 1997 surface-water sample set at concentrations of 0.058 mg/L (SW-1), 0.05 mg/L (SW-
2), and 0.049 mg/L (SW-3). Cadmium, chromium, hexavalent chromium, and vanadium were
not detected.
6-1
S:\J 354\PROJEC1\l 997\97-l 7 5A AquAir Il\Rl Report\Rl Chapt 6 -02.doc
NORFOLK SOUTHERN RAILROAD----.___
AQUAIR
FACILITY
JQVHflJT
I
CMUD SEWER
WOODS
FORMER
LABORATORY
BUILDING
/----SEVER I~-
t' I!
CAlE
FORMER
PRODUCTION
BUILDING __ ___..,--.
CLEARING
GRAPHIC SCALE
' I
120 0 80 120 240 ~-~-~-~-~-'~-!·-'---'
( JH FEET)
----ABANDONED SUPPLY WELL
AREA Of" DRAIN LINE Ern..IJENT RUNOfl'
---SEPTIC TANK
-----DIKED ABOVE GROUND
STORAGE TANK AREA
WOODS
WOODS
WOODS
+ ASW-03
LEGEND
WATER SUPPLY WELL
SURFACE WATER FLOW
DIRECTION
SURFACE WATER SAMPLE
~ ASW-03
+ GP-01 GEOPROBE SAMPLE
SCALE:
E
SURFACE WATER AND SOIL
SAMPLING LOCATIONS
AQUAIR REMEDIAL INVESTIGA llON
CHARLOTTE, NORTH CAROLINA
AS SHOWN ORA~ BY: MFP CHECKED BY:
JOB NO. DAlE: AGURE NO.
1354-97-175A 11-07-00 6-1
RI REPORT -CHAPTER 6
AQUAIR REMEDIAL INVESTIGATION
6.2 SEDIMENT SAMPLES
October 2001
S&ME Project No. 1354-97-175 A
During the SSI, S&ME sampled sediment (SED-1, SED-2, and SED-3) in the Unnamed Creek at
three locations on February 25, 1997 (Figure 4-5). Constant flow was present at this time. The
samples were analyzed by Pace for VOCs and metals (barium, cadmium, chromium, hexavalent
chromium, and vanadium).
In addition, S&ME sampled sediment at four locations (SED-4 through SED-7) in small runoff
channels (drainageways) east of the former Facility (Figure 4-5); a duplicate sample of SED-4
was also collected. The samples were analyzed by Pace for the metals (barium, cadmium,
chromium, hexavalent chromium, and vanadium).
VOCs were not detected in the three samples (SED-1 through SED-3) collected from the
Unnamed Creek. Hexavalent chromium was not detected in any of the seven sediment samples.
Cadmium, chromium, and vanadium were detected in all Unnamed Creek sediment samples
(Table 6-1 ). Except for barium, the concentration of metals was highest in the midstream sample
(SED-2) compared to the upstream and downstream samples (SED-1 and SED-3). The
concentration of all metals was lowest in the downstream sample (SED-3).
In the three samples, the concentration of barium ranged from 570 mg/kg in the upstream sample
(SED-1) to 84 mg/kg in the downstream sample (SED-3). The concentration of cadmium ranged
from 5.4 (SED-2) to 1.2 mg/kg (SED-3), chromium ranged from 73 (SED-1) to 30 mg/kg (SED-
3) and lead ranged from 30 (SED-1) to 24 mg/kg (SED-3).
Vanadium was present at concentrations that exceed the DENR/IHSB Remedial Goal ("RG") of
1.1 mg/kg in all three sediment samples including the upstream sample (SED-1 ); the vanadium
concentration ranged from 330 (SED-2) to 110 (SED-1) mg/kg. The concentrations of the other
metals were below DENR/IHSB RG's in all three samples (Table 6-1).
6-3
S:\1354\PROJECTl1997\97-l 75A AquAir II\Rl Report\Rl Chapt 6 -02.doc
RI REPORT -CHAPTER 6
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Table 6-1 SEDIMENT SAMPLE METALS ANALYTICAL RESULTS
AQUAIR REMEDIAL INVESTIGATION -CHARLOTTE, NORTH CAROLINA
S&ME PROJECT NO. 1354-97-175 A
Sample
SED-1
SED-2
SED-3
SED-4
SED-4 (dup)
SED-5
SED-6
SED-7
Remedial Goal
(RG's)
Barium Cadmium Chromium
Unnamed Creek Sediment Samples
570 2.1 40
230 5.4 73
84 1.2 30
Drainageway Sediment Samples
49
66
160
100
150
NRG
(5,400*)
8
11
2.4
1.6
15.6
110
160
1,400
63
29
24,000
Lead Vanadium
25
30
24
97
110
31
400
Notes: (1) All results are milligrams per kilogram (mg/kg). (2) Remedial Goals (RG's)-Table
4-1, Guidelines for Assessment and Cleanup, IHSB-NCDENR (August 2001). (3) NRG -No
Remedial Goal. (4) 5,400* -Preliminary Remedial Goal ("PRG") Concentration, Version 7, US
EPA Region IX (November 2000). (5) Shaded concentrations exceed RG's. (6) i.1<1) -RG for
Vanadium Pentoxide is 140 mg/kg,
6-4
S:\1354\PROJEC1\l 997\97-l 75A AquAir Il\Rl Report\RJ Chapt 6 -02.doc
RI REPORT -CHAPTER 6
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
The highest concentrations of all metals were detected in Sediment Sample SED-5 which was
collected from a small drainageway approximately 50 east of the southeastern fence comer of the
former Facility (Figure 6-1 ). Scattered vanadium pentoxide pellets were observed in the area.
In the four drainageway sediment samples and one duplicate sample, the concentration of barium
ranged from 150 mg/kg in Sample SED-5 to 49 mg/kg in Sample SED-4. The concentration of
cadmium ranged from 170 (SED-5) to 1.6 mg/kg (SED-7), chromium ranged from 1,400 (SED-
5) to 29 mg/kg (SED-7) and lead ranged from 440 (SED-5) to 31 mg/kg (SED-7).
Vanadium was present at concentrations that exceed the DENR/IHSB RG of 1.1 mg/kg in all
four drainageway sediment samples; the vanadium concentration ranged from 1,000 (SED-5) to
90 (SED-7) mg/kg. The concentrations of lead and cadmium in Sample SED-7 also exceed their
DENRIIHSB RG's of 400 mg/kg, and 15.6 mg/kg. The concentrations of the other metals were
below DENRJIHSB RG's in all four samples (Table 6-1).
6.3 SHALLOW SOIL SAMPLES
Two shallow soil samples were collected on December 7, 1998 by Geoprobe™ sampling
methods from Probe Hole GP-01 located adjacent to the former septic tank (Figure 6-1).
Shallow soil sample GP-01 was collected from a depth of 0.0 to 4.0 feet BLS. Soil sample GH-
01 (4-8) was collected from a depth of 4.0 to 8.0 feet BLS. The samples were collected to
evaluate the potential vertical extent of soil impact from leakage from the former septic tank.
Soil sample GP-01 was analyzed for Method 8260 voes, and sample GP-01 (4-8) was analyzed
for Method 8260 VOes and Method 8270 SVOes by Pace. SVOes were not detected in Sample
GP-01 (4-8), and voes were not detected in Sample GP-01. Methylene chloride was detected at
a concentration of 180 µg/kg in Sample GP-01 (4-8).
6-5
S:\1354\PROJEC1\l 997\97-l 75A AquAir 11\RJ Report\RJ Chapt 6 -02.doc
RI REPORT -CHAPTER 6
AQUAIR REMEDIAL INVESTIGATION
6.4 ANALYTICAL DATA ANALYSIS
October 2001
S&ME Project No. 1354-97-175 A
Surface water in the Unnamed Creek does not appear to be impacted by the discharge of Shallow
Aquifer contaminated groundwater when flow is present in the stream, based on the S&ME 1997
surface-water sample VOC data for samples SW-1, SW-2, and SW-3. VOC data from the
Greenhome & O'Mara 1990 samples (Table 4-1, Chapter 4) also indicate that VOCs are not
present in the Unnamed Creek surface water. Once stream flow ceases, however, an impact to
surface-water quality from low concentrations of chlorinated voes due to groundwater
discharge may be occurring as indicated by the presence of chloromethane and chloroform at
concentrations of 10 µg/L in the 1999 midstream and downstream samples ASW-01 and ASW-
02-0199.
The concentration of vanadium in current and historical sediment samples (Greenhorne &
O'Mara, 1990, Table 4-3) from the Unnamed Creek exceeds the DENR/IHSB RG of 1.1 mg/kg.
However, analytical data from upstream sediment samples collected by S&ME (Table 6-1, SED-
1, 110 mg/kg) and Greenhorne & O'Mara (Table 4-3, SED-1, 192 mg/kg) indicate that
concentrations of vanadium above the RG are naturally present in the stream sediment.
Elevated concentrations of vanadium above the RG of 1.1 mg/kg were detected in sediment and
soil samples collected near the Former Facility. The highest concentrations of vanadium appear
to be present in samples collected in areas that contain Vanadium-Pentoxide pellets. However,
background soil-sample analytical data from Greenhorne & O'Mara (SS-1, Table 4-3, 29.3
mg/kg) and Delta (BAC-1 and BAC-2, Table 4-10, 130 mg/kg and 74 mg/kg) indicate that
concentrations of vanadium above the RG are naturally present.
Current and historical sample analytical data indicate that lead and cadmium are present in some
sediments and soil at the Former Facility at concentrations above DENRIIHSB RG's. In
addition, historical data indicate that chlorinated and non-chlorinated organic compounds have
impacted shallow soil beneath, and adjacent to, the floor slab at the Former Facility. Some VOCs
are present above RG's such as PCE (G&M, Table 4-12, SS-7, PCE at a concentration of 740
6-6
S:\l 354\PROJECT\l 997\97-l 75A AquAir 11\Rl Report\RI Chapt 6 -02.doc
RI REPORT -CHAPTER 6
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
mg/kg with RG of 110 mg/kg). However, S&ME soil-sample data [(GP-01 and GP-01 (4-8)}
collected at GP-01 (Figure 6-1) indicate that the organic-compound impact to soil does extend
beyond the perimeter fence of the Former Facility.
6-7
S:\1354\PROJECT\l 997\97-l 75A AquAir II\RI Report\RI Chapt 6 -02.doc
RI REPORT-CHAPTER 7
AQUAIR REMEDIAL INVESTIGATION
May 2001
S&ME Project No. 1354-95-597
7.0 SHALLOW AQUIFER GROUNDWATER QUALITY
The Shallow Aquifer at the Site is present in the Upper Saprolite Unit, which is approximately
20 to 25 feet thick. The Bedrock Aquifer underlies the Shallow Aquifer and is in direct
hydraulic connection over most of the Site. The Shallow Aquifer discharges to the Unnamed
Creek during periods of High Groundwater levels.
Water levels in the Shallow Aquifer in October 2000 prior to initiation of the IRM GWRS
generally ranged from about 5 to 20 feet deep. Shallower groundwater was present in the lower
elevation areas along the Unnamed Creek. Deeper groundwater was present in areas of higher
elevation that include the former Facility and the upland areas to the east and west of the creek.
Historically, groundwater levels in the Shallow Aquifer have been 2 to 6 feet shallower.
Groundwater level declines at the Site have been the result of deficit rainfall over the past several
years.
During the RI, groundwater quality in the Shallow Aquifer was evaluated by the collection of
groundwater samples from on-Site monitoring wells. The monitoring well network at the Site
consists of 10 wells installed by Delta (MW-1 through MW-10), and 10 wells installed by
S&ME (AMW-101 through AMW-110). The locations of the wells are shown on Figure 7-1.
All existing monitoring wells, and S&ME wells AMW-101 and AMW-102, have been sampled
at least twice. S&ME Wells AMW-103 through AMW-110 have been sampled once during the
RI. Delta performed groundwater sampling in March and September 1992. S&ME performed
groundwater sampling in February 1997, October and November 1998, and July 1999.
Groundwater samples from all wells were analyzed for Method 8260 VOCs. The VOC
analytical results for the Delta monitoring wells are presented in Table 7-1. The VOC analytical
results for the S&ME monitoring wells are presented in Table 7-2.
7-1
S:\1354\PROJECT\1997\97-l 75A AquAir 11\RI Report\Rl Chap! 7 -02.doc
NORFOLK SOUTHERN RAILROAD---
AQUAIR
FACILITY
JfUMOUT
I
WOODS
ATW-02 ~ + AMW-106
FORMER
LABORATORY
BUILDING
,::;--.....
1 \i+'C
SAM NEELY l!OAD \
CATE
FORMER
PRODUCTION
BUILDING ---~--'
------------L~~__J' i °'-:
(" CONQl£lE ~'
AMW!411
(ATB-11)
GRAPHIC SCALE
120 o eo 120 240 ~I ~---~-~-~-'-•'---•' ( IH PDT )
+ ATB-01
A1W-101
WOODS
CMUD SEWER
+ AMW-410
(ATB-10)
ATW-03 *+ AMW-405
(ATB-04)
+ AlB-02 AMW-110 + RW-1
+' AMW-403&AMW-503
{ATB-03)
+ AMW-612
(ATB-12)
+ AMW-102
AMt509
(ATB-09)
AMW-10~+
AlB-06
WOODS
AMW-09
WOODS
+ AMW-608
(AlB-08)
+ AMW-607
(ATB-07)
LEGEND
lllW-GI ~ WATER SUPPLY WELL
OW-I
0 DELTA UPPER BEDROCK WELL
llW-3
_..._ DELTA SHALLOW WELL ,,.J-,01 + S&ME SHALLOW WELL
~ S&ME BEDROCK TEST
CA-> BOREHOLE/MONITORING WELL
A~
\ + T S&ME BEDROCK TEST
~ S&ME TEMPORARY WELL OR
e PROBE HOLE
SCALE:
AMW-108
+ AMW-107
+ AMW-404
(AlB-04)
E
SHALLOW AQUIFER
MONITORING POINTS
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
DRA\litll BY: CHECKED BY:
AS SHOWN MFP
JOB NO. DA TE: FIGURE NO.
1354-97-175A 11-07-00 7-1
Table 7-1
SHALLOW AQUIFER SAMPLE voe ANALYTICAL RESULTS SUMMARY
RI PHASE II -EXISTING DELTA MONITORING WELLS
Remedial Investigation\ Feasibility Study
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-175 A
MW-02 l MW-03 MW-04 MW-05 2L
Volatile Ore:anic Compound 10/15/98
I I I, I , I-Trichloroethane ND
2 11, 1,2,2-Tetrachloroethane ND
3 l, 1,2-Trichloroethane ND
4 I, 1-Dichloroethane ND
5 l, 1-Dichloroethene ND
6 1,2-Dichloroethane ND
7 Carbon Tetrachloride ND
8 Chlorobenzene ND ND ND
9 Chloroform 100 67 ND
10 cis-1,2-Dichloroethene ND ND ND
11 Dichlorodifluoromethane ND ND 2.7
12 Methylene Chloride
13 Tetrachloroethene
14 Trichloroethene
Total VOCs
MW-06 MW-7 I MW-08
Volatile Organic Compound 10/15/98 I 02/20/97 I 03/03/92 03/03/92 I 09/29/92 I 10/15/98 I 09/29/92 I 10/15/98
I 11, I, I-Trichloroethane ND 16 3 1 ND ND ND ND
2 1, 1,2,2-Tetrachloroethane ND ND ND ND ND ND ND ND
3 1, 1,2-Trichloroethane ND ND ND ND ND ND ND
4 l, 1-Dichloroethane ND ND ND ND ND
5 1, 1-Dichloroethene ND ND ND
6 1,2-Dichloroethane ND ND ND
7 Carbon Tetrachloride ND ND ND
8 Chlorobenzene ND ND ND ND ND ND ND
9 Chloroform ND ND 4 12 ND ND ND
10 cis-1,2-Dichloroethene ND ND ND ND ND ND ND
II Dichlorodifluoromethane ND ND ND ND ND 2.5 ND
12 Methylene Chloride ND ND ND ND ND ND ND
13 Tetrachloroethene ND ND ND
14 Trichloroethene ND ND ND
Total VOCs 0 I 2.5 I 0
Notes: (1) All results are in micrograms per liter (ug!L).
(2) VOCs -Volatile Organic Compounds.
(3) ND -Not Detected.
(4) 2L Stand. -North Carolina 15ANCAC 2L Groundwater Quality Standard.
(5) NS -No 2L Standard.
IJ'.l,Ql!ll -Concentration Exceeds 2L Groundwater Standard.
S:\1354\Project\1997\175 A\SA VOC Tables 7-1 & 7-2.xls\MW's Table 7-1 Page I of I
03/03/92 10/16/98 03/03/92 Stand.
ND ND ND 200
ND ND ND 0.17
ND ND ND NS
ND ND ND 700
ND ND ND 7
ND ND ND 0.38
ND ND ND 0.3
ND ND ND 50
ND ND ND 0.19
ND ND ND 70
ND ND ND 1,400
ND ND ND 5
ND ND ND 0.7
ND ND ND 2.8
0 I 0 I 0 I
MW-10 I 2L
/97 09/29/92 Stand.
14
I
14
11 ON~ ND ND
ND ND
700
7
0.38
IT
Sci
0.19
7o
1,400
5
0.7
2.8
Table 7-2
SHALLOW AQUIFER SAMPLE voe ANALYTICAL RESULTS SUMMARY
RI PHASE II -S&ME MONITORING WELLS
Remedial Investigation\ Feasibility Study
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-175 A
AMW-103 AMW-104 AMW-105 AMW-106 AMW-107 AMW-108 AMW-109 AMW-110 2L
Volatile Organic Compound I 02120197 10/20/98 10/20/98 10/23/98 10/20/98 07111199 07111199 07/11199 07111199 07111199 Stand.
l, I, 1,2-Tetrachloroethane ND ND ND ND ND ND ND ND ND NS
2 11, I, I-Trichloroethane ND ND ND ND ND ND ND ND ND 200
1, 1,2,2-Tetrachloroethane ND ND ND ND ND ND ND ND ND 0.17
4 I, 1,2-Trichloroethane ND ND ND ND ND ND ND ND ND NS
5 I, 1-Dichloroethane ND ND ND ND ND ND ND ND 6 700
6 1, 1-Dichloroethene ND ND ND ND ND ND ND ND 7
7 1,2,4-Trichlorobenzene ND ND ND ND ND ND ND ND 0.7
l ,2-Dichlorobenzene ND ND ND ND ND ND 620
9 1,2-Dichloroethane ND ND ND ND ND ND 0.38
10 1,2-Dichloropropane ND ND ND ND ND ND ND ND 0.56
II 2-Chlorotoluene ND ND ND ND ND ND ND ND ND NS
12 Benzene ND ND ND ND ND ND ND ND ND 1
13 Bromodichloromethane ND ND ND ND ND ND ND 0.6
14 Carbon Tetrachloride ND ND ND ND ND ND ~q-0.3
15 Chlorobenzene ND ND ND 5 ND ND 50
16 Chlorofonn ND ND ND ND ND ND ND
17 Chloromethane ND ND ND ND ND ND ND
18 cis-1,2-Dichloroethene ND ND ND ND ND ND ND
19 Dichlorodifluoromethane 1.9 1.5 1.4 ND ND ND ND ND ND 1,400
20 ND ND ND ND ND ND ND ND ND NS
21 ND ND ND ND ND ND ND ND ND 530
22 ND ND ND ND ND ND ND ND ND 5
23 ND ND ND ND ND ND 530
24 ND ND ND
25 Toluene ND ND ND
26 trans-1,2-Dichloroethene ND ND ND ND ND
27 Trichloroethene ND 2.6 ND ND ND
28 Vinyl Chloride ND ND ND ND ND
Total VOCs 1.9 42.9 1.4 0 0
Notes: (!) All results are in micrograms per liter (ug/L).
(2) VOCs -Volatile Organic Compounds.
(3) ND -Not Detected.
(4) 2L Stand. -North Carolina ISA NCAC 2L Groundwater Quality Standard.
(5) NS -No 2L Standard.
--~ -Concentration Exceeds 2L Groundwater Standard.
RI REPORT -CHAPTER 7
AQUAIR REMEDIAL INVESTIGATION
7.1 VOLATILE ORGANIC COMPOUNDS
May 2001
S&ME Project No. 1354-95-597
The suite of detected VOCs consists of chlorinated and non-chlorinated compounds (Tables 7-1
and 7-2). A total of 28 VOCs were detected.
Detected chlorinated compounds include primarily Carbon Tetrachloride ("Carbon Tet"),
Chloroform, Tetrachloroethene ("PCE") and its degradation products Trichloroethene ("TCE")
and Dichloroethene ("DCE") and Dichloroethane ("DCA"), Methylene Chloride, and 1, 1, 1-
Trichloroethane ("1, 1, 1-TCA"). Detected non-chlorinated compounds include primarily
Toluene, and smaller concentrations of Benzene and Xylenes.
Non-chlorinated VOCs primarily occurred in samples collected from monitoring wells at or
immediately adjacent to the former production building. Chlorinated VOCs were detected in
samples collected from monitoring wells at and downgradient (east) of the Former Facility.
Individual non-chlorinated compounds were not detected at concentrations greater than 400 µg/L
in any sample collected from the Shallow Aquifer. Toluene formed 50 to 90 percent of the
detected non-chlorinated voes.
Eight chlorinated VOCs were present at concentrations greater than 1,000 µg/L in the sample
suite collected from five monitoring wells and included:
• Carbon Tet-detected in samples collected from wells MW-9, AMW-101,
and AMW-102; maximum concentration 75,00 µg/L in the February 1997
sample collected from Well AMW-101 which is located immediately east
of the former septic tank;
• Chloroform -detected in samples collected from wells MW-9, AMW-
101, and AMW-102; maximum concentration 24,000 µg/L in the October
and November 1998 samples collected from Well AMW-102 which is
located approximately 650 feet east of the Former Facility;
7-5
S:\l 354\PROJEC1\1997\97-l 75A AquAir 11\RI Report\RJ Chapt 7 -02.doc
RI REPORT-CHAPTER 7
AQUAIR REMEDIAL INVESTIGATION
May 2001
S&ME Project No. 1354-95-597
• PCE -detected in samples collected from wells MW-9, AMW-101, and
AMW-102 ; maximum concentration 24,000 µg/L in the February 1997
sample collected from Well AMW-101;
• 1,1-DCE -detected in a samples collected from Well MW-3, MW-9, and
AMW-101; maximum concentration 7,400 µg/L in the February 1997
sample from Well AMW-101;
• 1,2-DCA -detected in samples collected from Well MW-9 and AMW-
102; maximum concentration 8,600 µg/L in the September 1992 sample
from MW-9 which is located approximately 260 feet east-northeast of the
former septic tank;
TCE -detected in samples collected from wells MW-3, MW-9, AMW-
101, and AMW-102; maximum concentration 6000 µg/L in the February
1997 sample collected from Well AMW-101 which is located immediately
east of the former septic tank;
Chlorobenzene -detected in a sample collected from AMW-101;
maximum concentration 1,000 µg/L in the February 1997 sample; and
Methylene Chloride -detected in samples collected from wells MW-9,
AMW-101, and AMW-102; maximum concentration 10,000 µg/L in the
February 1997 sample collected from well AMW-101.
Monitoring wells with groundwater samples that contained Total VOCs (TVOC) concentrations
that exceeded 1,000 ug/L included MW-2, MW-3, MW-9, AMW-101, AMW-102, and AMW-
110. Wells MW-2, MW-3, MW-9, and AMW-101 are located within about 250 feet of the
eastern end of the Former Facility. Well AMW-102 is located approximately 650 feet east of the
former Facility. The highest TVOC concentration (151,615 ug/L) was detected in the February
1997 sample collected from Monitoring well AMW-101. Only samples collected from
Monitoring Well AMW-102 contained TVOC concentrations greater than 100,000 µg/L.
Twenty-one VOCs were detected in groundwater samples from the Shallow Aquifer at
concentrations that exceeded their respective North Carolina Administrative Code 2L
Groundwater Standard ("2L Standard"). Benzene was the only non-chlorinated VOC that
exceeded its 2L Standard (1.0 µg/L) which occurred in samples collected from wells AMW-101
and AMW-102.
7-6
S:\1354\PROJECT\l 997\97-175A AquAir 11\RI Report\RI Chapt 7 -02.doc
RI REPORT -CHAPTER 7
AQUAIR REMEDIAL INVESTIGATION
May 2001
S&ME Project No. 1354-95-597
Groundwater samples collected from 13 monitoring wells contained VOCs that exceeded their
respective 2L Standard. Groundwater samples collected from AMW-102 contained 20 VOCs
that exceeded their respective 2L Standard; samples from AMW-101 contained 16 VOCs that
exceeded 2L Standards. The VOCs that exceeded their respective 2L Standard are highlighted in
Tables 7-1 and 7-2.
7.2 SEMI-VOLATILE ORGANIC COMPOUNDS
Groundwater samples collected in February 1997 from two temporary wells (ATW-202 and
ATW-203), one S&ME well (AMW-101), four Delta wells (MW-3, MW-6, MW-9, and MW-
10), and one Geoprobe probe hole (APH-04) were analyzed for SVOCs by Pace by BP A Method
8270. The locations of these wells are shown in Figure 7-1.
Only two SVOCs were detected in the Shallow Aquifer groundwater-sample suite. Phenol was
detected in the AMW-101 sample at a concentration of 31 µg/L. Bis (2-ethylhexyl) phthalate
("BEHP") was detected in the APH-04 sample at a concentration of 10 µg/L. The phenol
concentration does not exceed its 2L Standard of 300 µg/L. The BEHP concentration exceeds
the 2L Standard of 3.0 µg/L, but BEHP is a typical laboratory or equipment contaminant.
Historical data also does not indicate the presence of SVOCs at concentrations that exceed 2L
Standards.
7.3 CONTAMINATION ANALYTICAL DATA EVALUATION
Chlorinated and non-chlorinated VOCs impact groundwater in the Shallow Aquifer in the
vicinity of the former production building. Chlorinated VOCs impact groundwater in the
Shallow Aquifer downgradient of the Former Facility extending to the east.
The configuration of the TVOC plume in the Shallow Aquifer is illustrated in Figure 7-2. The
TVOC plume in the aquifer has its highest concentrations (greater than 100,000 µg/L) extending
7-7
S:\1354\PROJECT\l 997\97-l 75A AquAir II\RI Report\RI Chapt 7 -02.doc
NORFOLK SOUTHERN RAILROAD --........._ . CREEK \ /UNNAMED
AQUAIR
FACILITY
~DW-1
Mw-a""T°' 0
MW-4+
GRAPHIC SCALE
+o
AMW-106
MW-10* 259.6 ~.............-·-1
l
CMUD SEWER
--=~>;.;
+
72,300
DW-2
66, 450 '-9•
""'
AIB-02 + RW-1
DW-3 99.4 +
0 ~-6• AMW-403.tAMW-503
(ATB-03)
---o:o~~-------~on-----------~ ~~5 ~ +
MW-7 AMW-612
(ATB-12)
120 o eo 120 240 ~f--§i_--§-~-~-'--•l'----~I
( Dl l'DT)
AMW-110
-+-1,111
AMW-109
AMW!509
(ATB-09)
------
\
SCALE:
126
+
+ AMW-608
(ATB-08)
+ AMW-607
(ATB-07)
LEGEND
~ WATER SUPPLY WELL
~ DELTA UPPER BEDROCK WELL + \ DEL TA SHALLOW WELL
Alllfo-101 + I S&ME SHALLOW WELL
-S&ME BEDROCK TEST + I BOREHOLE/MONITORING WELL
(ATIHl4) AT ) S&:ME BEDROCK TEST BOREHOLE :
$j TOTAL voes IN MICROGRAMS I
1;i)< PER LITER :
ISO-CHEMICAL CONTOUR LINE
/+
AMW-404
(ATB-04)
E
SHALLOW AQUIFER voe CONTOUR MAP
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
DRA\m BY: MFP CHECKED BY:
AS SHOWN
JOB NO. DATE: AGURE NO.
1354-97-175A 11-07-00 7-2
RI REPORT -CHAPTER 7
AQUAIR REMEDIAL INVESTIGATION
May 2001
S&ME Project No. 1354-95-597
from the former septic tank eastward through the location of AMW-102. The central portion of
the plume appears to be approximately 700 feet long (east-west) and only about 50 feet wide
(north-south). The extremely linear nature of the central portion of the plume indicates that a
structural feature (fault or joint) in the Saprolite is a primary control over migration.
The configuration of the groundwater plume indicates that the former septic tank, and associated
drain field, was the primary release source of organic contaminants. Secondary releases are
indicated in the area of Monitoring Well MW-1 that are probably associated with the former
ASTs that were reported to be present on the concrete pad located at the southern end of the
Former Facility.
The Shallow Aquifer plume is estimated to have migrated approximately 1,200 feet from the
release sources in an easterly direction. The plume appears to extend to east of the Unnamed
Creek between well AMW-105 to the north and well AMW-107 to the south and is centered in
the area of Monitoring Well AMW-108. Based on the configuration shown in Figure 7-2, the
Shallow Aquifer groundwater VOC plume is estimated to cover approximately 20 acres.
7-9
S:\J354\PROJECT\l 997\97-J 75A AquAir 11\RJ Report\RJ Chapt 7 -OZ.doc
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
8.0 BEDROCK AQUIFER GROUNDWATER QUALITY
Twelve test boreholes (ATB-01 through ATB-12) were drilled into the Bedrock Aquifer during
the RI to evaluate lateral and vertical groundwater quality in the aquifer. One test borehole,
ATB-01, was drilled just northeast of the former septic tank and drain line, a suspected primary
release source. Borehole ATB-05 had to be completed as a monitoring well (AMW-405) due to
unstable rock conditions. Geophysical logging, borehole video camera inspection, and discrete-
interval hydraulic testing and groundwater sampling were performed in the other test boreholes.
Groundwater flow measurements were also performed in ATB-01 through ATB-03.
Following discrete-interval testing, S&ME converted eight test boreholes (ATB-03, ATB-04,
and ATB-07 through ATB-12) into monitoring wells. A single well was installed in all
boreholes except ATB-03 where two wells (AMW-403 and AMW-305) were installed. The
monitoring wells were completed in either the most permeable fracture zone, or the fracture zone
with the highest concentration ofVOCs in its discrete-interval groundwater sample.
Delta installed four Type II monitoring wells in the upper portion of the aquifer during their
investigation in 1992. An abandoned water supply well (ESW-01) is present just east of the
former laboratory building and was sampled twice during the RI. The locations of these wells
and test boreholes are shown in Figure 8-1.
8.1 DISCRETE-INTERVAL GROUNDWATER SAMPLING
Discrete-interval groundwater samples were collected from water-bearing fractures in 11
bedrock test boreholes. Four to ten discrete intervals were sampled in each borehole. Discrete-
interval sampling was performed on two occasions at boreholes ATB-01 through ATB-04; the
initial sampling was performed in February 1997 (the "1997 Sample Set"). All 11 test boreholes
were sampled in October to December 1998 (the "1998 Sample Set").
8-1
S:\ 1354\PROJECT\1997\97-17 5A AquAir JI\Rl Report\Rl Chapt 8 -02.doc
NORFOLK SOUTHERN RAILROAD----.
AQUAIR
FACILITY
J...,..on
I
/:::-&'HER
I
I -'.!:l .--.~----11 --·-~ \ I ,
'
ll ESW-01 r' -~ ~
L DW~4@ l
SAM ~y ROAD i . GAlt J
I '-GAlt t _.I._
t FORMER~ !Ln 1 ArnTo1 -
r PRODUCTION I ---
1,' BUILDING ! ! i1
I ,--·-----" I L ______ 1 1~ I
+ t I':--~ I
AMW-411 • 1
(ATB-11) I I
. I L ____ _,, .i
GRAPHIC SCALE
120 0 '° 120 240 ~~~--~--...l~--1--1. ___ ,
(INm:r)
+ AMW-410
(ATB-10)
DW-2
@
\ /UNNAMED . CREEK
""
DW-.3
@
+ 0 AMW-405
(ATB-04)
AlB-02 + RW-1
+ AMW-403&AMW-503
(ATB-03)
+ AMW-612
(ATB-12)
+ ATB-06
\
SCALE:
+ AMW-60B
(ATB-08)
c d
0:: + ff1 AMW-607
kt (ATB-07) u 1----------------------------'---I ~ LEGEND
OW-GI ~ WATER SUPPLY WELL
~1 DELTA UPPER BEDROCK WELL
~ S&ME BEDROCK TEST
(1.'IB-o4) BOREHOLE/MONITORING WELL AT S&ME BEDROCK TEST BOREHOLE
+ AMW-404
(ATB-04)
E
BEDROCK AQUIFER
MONITORING POINTS
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
DR/Iv.ff BY: MFP CHEa<ED BY:
AS SHOWN
JOB NO. DAlE: AGURE NO.
1354-97-175A 11-07-00 8-1
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
8.1.1 Volatile Organic Compounds
October 2001
S&ME Project No. 1354-97-175 A
Discrete-interval groundwater samples collected during the RI were analyzed for Method 8260
VOCs by the Pace. VOC analytical results for the discrete-interval samples are summarized in
Table 8-1.
As many as 19 VOCs were detected in the discrete-interval groundwater sample sets. Benzene,
Toluene, and Xylenes were the only non-chlorinated VOCs detected and were restricted to low-
level detections in samples collected from test boreholes ATB-02 and ATB-03. The highest
concentration (470 µg/L) of Toluene occurred in sample GW02 that was collected at a depth
interval of 117 to 122 feet BLS in the ATB-02 1998 Sample Set.
voes were not detected in any discrete-interval groundwater sample collected from test
boreholes ATB-07, ATB-09, and ATB-12. Methylene Chloride was the only VOC detected in a
single discrete-interval sample from boreholes ATB-06 and ATB-11; the compound is suspected
to be a laboratory artifact.
Only one chlorinated VOC was detected in a single discrete-interval sample collected from
boreholes ATB-08 and ATB-10. PCE was detected at a concentration of 44 µg/L in the deepest
sample (GW-01 from 155 to 166 feet BLS) in ATB-08; five shallower samples did not contain
any VOCs. TCE was detected in Sample GW-03 (78 to 89 feet BLS) in ATB-1 O; four other
samples did not contain any VOCs. TCE (7.9 µg/L) and PCE (44 µg/L) exceeded their
respective 2L Standards of2.8 µg/L and 0.7 µg/L.
The most numerous VOCs, and the highest concentrations, were detected in discrete-interval
groundwater samples collected from test boreholes ATB-01 through ATB-03. Carbon Tet,
Chloroform, PCE, 1,2-DCE, Methylene Chloride, and TCE, were present in most samples from
ATB-01 and ATB-02 at concentrations greater than 1,000 µg/L. Chloroform was present in all
1998 discrete-interval samples collected from ATB-03 at concentrations great than 1,000 µg/L.
8-3
S:\l 354\PROJECT\1997\97-175A AquAir 11\RI Report\RI Chapt 8 -02.doc
1
2
3
4
5
6
7
8
9
10
11
12
2
3
4
5
6
7
8
9
10
11
Table 8-1
voe ANALYTICAL RESULTS SUMMARY
RI PHASE II -BEDROCK TEST BOREHOLES DISCRETE INTERVAL SAMPLES
Remedial Investigation \ Feasibility Study
AquAir Site
S&ME Project No. 1354-97-l 75A
ATB-01
GWOl GW02 GW03 GW04 GWOS I GW55 I GWOS
10/12/98 02/24/97 10/12/98 02/24/97 10/12/98 10/13/98 02/24/97
Volatile Organic Compound 150 -155 200+ 107 -112 109-119
l, 1,2,2-Tetrachloroethane ND ND ND ND
1, 1-Dichloroethene ND ND ND
1,2-Dichloroethane
Carbon Tetrachloride
Chlorobenzene
Chloroform
cis-1,2-Dichloroethene
Dichlorodifluoromethane
Hexachlorobutadiene
Methylene Chloride
Tetrachloroethene
Trichloroethene
Total VOCs 960
ATB-03
GWOl GW51 GWOl GW02 GW03 GW04
10/07/98 05122197 I I 0/07 /98 I 05122197 I I 0/08/98 I 05122197 I I 0/08/98 I 05122197
Volatile Organic Compound 132 -137 134 I 64 -69 I 66 I 52 -57 I 54 I 32 -37 I 34
1, 1-Dichloroethane
1, 1-Dichloroethene
1,2-Dichloroethane
Carbon Tetrachloride
Chlorobenzene
Chloroform
cis-1,2-Dichloroethene
Methylene Chloride
Tetrachloroethene
Toluene
Trichloroethene
Total VOCs
S:\13545\Project\1997\175 A\Bdrx TB DI voe Anal Sum-OJ Table 8-1.xls\Brx Discrete Int voes Table 8-JPage 1 of 4
2L
Stand.
017
7
0.38
0.3
50
0.19
70
1,400
0.44
5
0.7
2.8
2L
Stand.
700
7
0.38
0.3
50
0.19
70
5
0.7
1,000
2.8
Table 8-1
voe ANALYTICAL RESULTS SUMMARY
RI PHASE II -BEDROCK TEST BOREHOLES DISCRETE INTERVAL SAMPLES
Remedial Investigation \ Feasibility Study
AquAir Site
S&ME Project No. 1354-97-l 75A
ATB-02
GWOl GW02 GW03 GW53 GW03 GW04 GWOS
10/13/98 05/23/97 10/13/98 05/23/97 10/14/98 05/23/97 10/14/98 05/23/97 10/14/98 05/23/97 ~ Volatile Organic Compound I 126 -131 128 117 -122 119 87 -92 89 48-53 50 30 -35 32 d.
1, 1, 1,2-Tetrachloroethane ND ND ND ND ND ND ND ND ND ND 13 NS
2 I, 1, I-Trichloroethane ND ND ND 140 ND ND 120 ND 130 ND ND 200
3 1, 1,2,2-Tetrachloroethane ND ND ND ND ND ND ND ND 0.17
4 I, 1,2-Trichloroethane ND ND ND ND ND ND ND 26 NS
5 I, 1-Dichloroethane 59 700
6 I, 1-Dichloroethene 7
7 1,2-Dichloroethane 0.38
8 Benzene 1.0
9 Carbon Tetrachloride 0.3
10 Chlorobenzene 50
1 1 Chloroform
12 cis-1,2-Dichloroethene
13 Dichlorodifluoromethane
14 m&p-Xylene
15 Methylene Chloride
16 Tetrachloroethene
17 Toluene 1,000
18 trans-1,2-Dichloroethene ND 5.4 70
19 Trichloroethene :0 ' ,,. ,"(ij '' 2.8
Total VOCs
ATB-04
GWOl GW02 GW03 GW04 GW54 GW04
10/09/98 06/16/97 10/09/98 06116197 10/09/98 06/16/97 10/09/98 10/09/98 06/16/97 ~L Volatile Organic Compound I 123 -128 125 93 -98 95 58 -63 60 36-41 38 nd.
Methylene Chloride ND ND ND ND ND ND ND ~ 2 tert-Butylbenzene ND ND ND ND 1.7 ND ND 0
3 Tetrachloroethene ND ND ND ND ND ND 7
Total VOCs II 0 I 0 I 0 l 0 I 1.7 I 0 2.0 10.5
S:\13545\Project\1997\175 A\Bdrx TB DI voe Anal Sum-OJ Table 8-1.xls\Brx Discrete Int voes Table 8-if'age 2 of 4
Table 8-1
voe ANALYTICAL RESULTS SUMMARY
RI PHASE II -BEDROCK TEST BOREHOLES DISCRETE INTERVAL SAMPLES
Remedial Investigation \ Feasibility Study
AquAir Site
S&:ME Project No. 1354-97-175A
ATB-06
GWOl GW-02 GW-03 GW-04 GW-05 GW-06 GW-07 GW-08 GW-09
12/02/98 12/02/98 12/02/98 11/30/98 11/30/98 11/30/98 11/30/98 11130/98 11/30/98
Volatile Organic Compound 267 -278 235 -246 224-235 213 -224 180-191 143 -154 126-137 90-101 71 -82
1 I Methylene Chloride I ND I ND l ND fllli~lll ND I ND I ND I ND I ND
Total voes 0 0 0 7.0 0 0 0 0 0
ATB-07
GW-01 GW-02 GW-03 GW-04 GW-05
12/14/98 12/15/98 12/15/98 12/15/98 12/15/98
187 -198 175-186 118 -129 77-88 66-77
Total voes 0 0 0 0 0
ATB-08
GW-01 GW-02 GW-03 GW-04 GW-05 GW-06
12/03/98 12/03/98 12/03/98 12/03/98 12/03/98 12/03/98
Volatile Organic Compound 155-166 131 -142 114 -125 94 -105 79-91 49-60
1 I Tetrachloroethene ~ ND ND ND ND ND
Total VOCs
I
0 0 0 0 0
ATB-09
GW-01 GW-02 GW-03 GW-04 GW-05
11/19/98 11/19/98 11119/98 11120/98 11/20/98
138-149 114-125 92 -103 68-79 55 -66
Total VOCs 0 0 0 0 0
S:\13545\Project\1997\175 A\Bdrx TB DI voe Anal Sum-OJ Table 8-1.xls\Brx Discrete Int voes Table g.JPage 3 of 4
GW-10
11130/98 2L
50-61 Stand.
I ND I I 5
0
2L
Stand.
2L
Stand.
0.7
2L
Stand.
Table 8-1
voe ANALYTICAL RESULTS SUMMARY
RI PHASE II -BEDROCK TEST BOREHOLES DISCRETE INTERVAL SAMPLES
Remedial Investigation \ Feasibility Study
AquAir Site
S&MEProjectNo. 1354-97-175A
ATB-10
GW-01 GW-02 GW-03 GW-04 GW-05
12/04/98 12/04/98 12/07/98 12/07/98 12/07/98
Volatile Organic Compound 139-150 102 -113 78 -89 55 -66 42 -53
1 I Trichloroethene I ND I ND 11111111 : .. ~--'.JA¥·.~ . ·.~ ND I ND I
Total VOCs 0 0 7.9 0 0
ATB-11
GW-01 GW-02 GW-03 GW-04 GW-5
11/14/98 11/14/98 11/16/98 11/17/98 11/17/98
Volatile Organic Compound 141-152 131 -142 121 -132 48 -89 67 -78
1 I Methylene Chloride llilfllMI ND I ND I ND I ND I
Total VOCs
Total VOCs
7.4 0 0 0
ATB-12
GW-01 GW-02 GW-03 GW-04
11/11/98 11/11/98 11/11/98 11112/98
143-154 123-134 105-116 79-90
0 0 0 0
Notes: (1) All results are in micrograms per liter (ug/L).
(2) VOCs -Volatile Organic Compounds.
(3) ND -Not Detected.
0
GW-05 GW-06 GW-07
11/12/98 11/12/98 11/12/98
62-73 47-58 37-48
0 0 0
(4) 2L Stand. -North Carolina 15A NCAC 2L Groundwater Quality Standard.
(5) NS -No 2L Standard.
(6) ATB -AquAir Bedrock Test Borehole.
(7) GW-53 -Duplicate Sample.
(8) 141 -152 -Discrete Sample Interval in Depth Below Land Surface.
lllQUll -Concentration Exceeds 2L Groundwater Standard.
S:\13545\Project\1997\175 A\Bdrx TB DJ voe Anal Swn-01Table8-1.xls\Brx Discrete Int voes Table 8-if'age 4 of 4
2L
Stand.
I 2.8
2L
Stand.
I 5
2L
Stand.
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Twelve VOCs were present in the discrete-interval sample set collected from ATB-01 at
concentrations that exceeded their respective 2L Standards. Eleven VOCs detected in samples
collected from ATB-02, and seven VOCs detected in ATB-03 samples, exceeded their respective
2L Standards. The VOCs present at concentrations greater than their respective 2L Standards are
highlighted in Table 8-1.
TVOC concentrations exceeded 1,000 ug/L in all samples from each discrete interval tested in
boreholes ATB-01 and ABT-02. All of the 1998 samples collected from ATB-03 exceeded
1,000 µg/L; the highest previous concentration in the 1997 Sample Set was 652.5 µg/L. The
highest TVOC concentration (202,300 µg/L) occurred in the ATB-01 sample collected in 1998
from a depth of 150 to 155 feet BLS.
TVOC concentrations were higher in the 1998 Sample Set from ATB-01 through ATB-03 than
the February 1997 samples. In addition, TVOC concentrations increased with depth in samples
collected from ATB-01 and ATB-03. Sample collected from ATB-03 exhibited less variability
with depth. The vertical distribution of the discrete-interval samples from these three Bedrock
test boreholes is exhibited in Figure 8-2. In addition, the increase in TVOC concentrations from
1997 to 1998 is also illustrated in Figure 8-2.
8.1.2 Chromium
All discrete-interval samples (a total of 64 including duplicate samples) collected from the 11
Bedrock test boreholes during 1998 were analyzed by Pace for Chromium and Hexavalent
Chromium. The analytical results are summarized in Table 8-2.
8-8
S:\1354\PROJECT\1997\97-l 75A AquAir II\RJ Report\RI Chapt 8 -02.doc
0
Figure 8-2
Bedrock Test Borehole D-1 VOCs
Total VOC Concentration (mg!L)
50 100 150 200
o--~~~-r-~~~-t--:-~~~r-~~~-i-~~~-r-~~~--r-,.....~~~-,--~~~-t-__,
0.5 '%..4
M I
0.fO
0.5
58
~100 ~~ 140 + f~ ,,___.I --I I I I ....
Q,)
Q,)
~.3 .:
I
41 ~ J"'. 59
39 ~o 112
'fr1so I .1 I • ~······ .·1.· ·. •I • ATB-0119971 I )"1 ~ · ~.··.·. I•. . ·. .· .,.,,,._ATB-011998 202
• & • ATB-02 1997
111 + .,. A TB-02 1998 f----+-----t-----J wo~-~~1 ~-~-~~~-~-~~~-ATB-0319n
-e-ATB-03 1998
250---'-~~~--'~~~~-'-~~~---'-~~~--J.~~~~-'-~~~~-'--~~~---'~~~~-'-~~
I
2
I
2
I
2
I
2
I
2
Table 8-2
CHROMIUM RESULTS SUMMARY
RI PHASE II -BEDROCK TEST BOREHOLES DISCRETE INTERVAL SAMPLES
Remedial Investigation \ Feasibility Study
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-175 A
ATB-01
GW-01 GW-02 GW-03 GW-04 GW-54
10/12/98 10/12/98 10/12/98 10/12/98
Inorganic Compound 150-155 107 -112 81 -86 51 -56
Chromium 0.0 <0.02 <0.01 <0.01 <0.01
Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05
ATB-02
GW-051 GW-01 GW-02 GW-03 GW-53 GW-04
10/13/98 10/13/98 10/14/98 10/14/98 10/14198
Inorganic Compound 126-131 117 -122 87 -92 48 -53 30-35
Chromium <0.01 <0.01 <0.01 <0.01 <0.01 <0.01
j Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05 <0.05
ATB-03 GW~4 I GW-01 GW-51 GW-02 GW-03
10/07/98 10/07/98 10/08/98 10108198
Inorganic Compound 132 -137 64 -69 52 -57 32-37
Chromium <0.01 <0.01 <0.01 <0.01 <0.01
Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05
ATB-04
GW-01 GW-02 GW-03 GW-04 GW-54
10/09/98 10/09/98 10/09/98 10/09/98
Inorganic Compound 123 -128 93 -98 58 -63 36-41
Chromium <0.02 <0.02 <0.02 <0.02 <0.02
Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05
ATB-06
GW-01 GW-02 GW-03 GW-04 GW-05 GW-06 GW-07 GW-08
12/02/98 12/02/98 12/02/98 11130/98 11/30/98 11130/98 11/30/98 11130/98
Inorganic Compound 267 -278 235 -246 224 -235 213 -224 180-191 143 -154 126 -137 90-101
Chromium <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01
Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05
S:\1354\Project\ ... 97-175 A\RI Report\Tables\Bdrx TB DI Cr Anal Sum-01 Table 8-2.xls\Bdx Discrete Int Cr Table 8-2
2L
Stand.
0.05
NS
I
2L
Stand.
I 0.05
NS
I
2L
Stand.
0.05
NS
2L
Stand.
0.05
NS
GW-09 GW-10
11130/98 11/30/98 2L
71 -82 50 -61 Stand.
<0.01 <0.01 0.05
<0.05 <0.05 NS
Page l of 3
1
2
1
2
I
2
1
2
Table 8-2
CHROMIUM RESULTS SUMMARY
RI PHASE II -BEDROCK TEST BOREHOLES DISCRETE INTERVAL SAMPLES
Remedial Investigation \ Feasibility Study
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-175 A
ATB-07
GW-01 GW-02 GW-03 GW-04 GW-05
12/14/98 12/15/98 12/15/98 12/15/98 12/15/98
Inorganic Compound 187 -198 175-186 118 -129 77 -88 66 -77
Chromium
I
<0.01 I <0.01 I 0.0 I 0.02 --.1 Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05
ATB-08
GW-061 GW-01 GW-02 GW-03 GW-04 GW-05
12/03/98 12/03/98 12/03/98 12/03/98 12103/98 12103n~
Inorganic Compound 155-166 131-142 114 -125 94 -105 79 -91 49-60
Chromium <0.01 <0.01 <0.01 <0.01 <0.01 <0.01
Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05 <0.05
ATB-09
GW-051 GW-01 GW-02 GW-03 GW-04
11/19/98 11/19/98 11/19/98 11/20/98 lll20n8
Inorganic Compound 138-149 114-125 92 -103 68 -79 55 -66
Chromium <0.01 <0.01 <0.01 <0.01 <0.01
Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05
ATB-10
GW-051 GW-01 GW-02 GW-03 GW-04
12/04/98 12/04/98 12/07/98 12/07/98 12107/98
Inorganic Compound 139-150 102 -113 78 -89 55 -66 42-53
Chromium <0.01 <0.01 <0.01 <0.01 <O.ot
Chromium, Hexavalent <0.05 <0.05 <0.05 <0.05 <0.05
S:\1354\Project\ ... 97-175 A\Rl Report\Tables\Bdrx TB DI Cr Anal Sum-01 Table 8-2.xls\Bdx Discrete Int Cr Table 8-2
2L
Stand.
0.05
NS
I
2L
Stand.
0.05
NS
I
2L
Stand.
0.05
NS
I
2L
Stand.
0.05
NS
Page 2 of 3
1
2
I
2
Table 8-2
CHROMIUM RESULTS SUMMARY
RI PHASE II -BEDROCK TEST BOREHOLES DISCRETE INTERVAL SAMPLES
Remedial Investigation\ Feasibility Study
Inorganic Compound
I Chromium
!Chromium, Hexavalent
Inorganic Compound
!Chromium
!Chromium, Hexavalent
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&MEProjectNo. 1354-97-175 A -
ATB-11
GW-01 GW-02 GW-03 GW-04 GW-5
11/14/98 11/14/98 11116/98 11/17/98 11117/98
141-152 131-142 121 -132 48 -89 67 -78
<0.01 <0.01 <0.01 <0.01 <0.01
<0.05 <0.05 <0.05 <0.05 <0.05
ATB-12 GW~7 I GW-01 GW-02 GW-03 GW-04 GW-05 GW-06
11111198 11111198 11/11198 11/12/98 11/12/98 11112/98 11112198
143-154 123-134 105-116 79-90 62-73 47-58 37-48
<0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <0.01
<0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05
Notes: (1) All results are in milligrams per liter (mg/L).
(2) 2L Stand. -North Carolina 15A NCAC 2L Groundwater Quality Standard.
(3) NS -No 2L Standard.
(4) ATB -AquAir Bedrock Test Borehole.
(5) GW-54 -Duplicate Sample.
(6) 141 -152 -Discrete Sample Interval in Depth Below Land Surface.
~ -Concentration Exceeds 2L Groundwater Standard.
S:\1354\Project\. .. 97-175 A\Rl Report\Tables\Bdrx TB DI Cr Anal Sum-01 Table 8-2.xls\Bdx Discrete Int Cr Table 8-2
2L
Stand.
0.05
NS
I
2L
Stand.
0.05
NS
Page 3 of 3
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&MEProjectNo. 1354-97-175 A
Chromium and Hexavalent Chromium were not detected in any discrete-interval samples
collected from 10 of the 11 test boreholes. Chromium was detected in two discrete-interval
samples (GW-04 and GW-05) collected from Test Borehole ATB-07 at a concentration of 0.02
mg/L. Hexavalent Chromium was detected in one ATB-07 sample (GW-05) at a concentration
of 0.06 mg/L.
8.1.3 Field Water-Quality and Natural Attenuation Parameters
Field water-quality and Natural Attenuation parameters were measured during discrete-interval
sampling in 11 Bedrock test Boreholes. Discrete-interval sampling could not be performed in
ATB-05 because of unstable rock conditions.
Field water-quality parameters included pH, Specific Conductivity, Temperature,
Oxidation/Reduction Potential ("Redox"), and Dissolved Oxygen ("DO"). Natural Attenuation
parameters included Nitrate, Chloride, Sulfate, Alkalinity, Carbon Dioxide, and Ferrous Iron.
Test results are summarized on Table 8-3.
In general, concentrations of Chloride were greater than 20 mg/L in all samples collected from
boreholes ATB-01 and ATB-02. Chloride concentrations at ATB-03 ranged from 12 to greater
than 20 mg/L. The Chloride concentration in samples from all other test boreholes was 8.0 mg/L
or less. Higher Chloride concentrations correlate with elevated concentrations ofVOCs.
The highest Ferrous Iron concentrations (generally 0.3 to 8.0 mg/L) were also measured in
samples collected from test boreholes that contained elevated levels of VOCs. The Ferrous Iron
concentrations in samples from the other test boreholes were 0.3 mg/L or less.
8-13
S:\1354\PROJECT\1997\97-175A AquAir Il\RJ Report\Rl Chapt 8 -02.doc
Table 8-3
BEDROCK-AQUIFER DISCRETE INTERVAL SAMPLE FIELD WATER-QUALITY DATA
RI PHASE II -BEDROCK TEST BOREHOLES
AqaAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-J 75A
Discrete Sample Sample Field Parameters Natural Attenuation Parameters
Interval Depth (feet) Date pH SC Temp Red ox DO N04 CI S04 Alk C02
Bedrock Aquifer Test Borehole ATB-01
1 40-45 1011311998 7.4 3JO 62.4 -261 NIA <O.J 2.4 25 >100 14
2 46 -51 J0/12/1998 7.4 290 63.8 -32.8 NIA 0 >20 25 >100 J7
3 81 -86 1011211998 7.4 370 64.7 -277.2 NIA 0 >20 25 >100 22
4 107-112 1011211998 7.4 570 64.9 -226.6 NIA 0 >20 25 >100 24
5 135-140 J0/1211998 7.4 680 63.7 41.5 NIA 0 >20 25 >100 22
Bedrock Aquifer Test Borehole ATB-02
1 30-35 10/14198 6.90 480 62.0 -91.4 NIA 0.1 >20 25 >100 27
32 05122197 6.89 7Jl 66.9 -6.6 NIA 0 >20 25 160 NIA
2 48 -53 J 0/14198 6.90 420 60.8 -52.7 NIA 0 >20 25 >JOO 15
50 05122197 6.67 747 67.0 5.0 NIA 0 >20 25 180 NIA
3 87 -92 10113198 6.90 510 60.4 -61.8 NIA 0 >20 50 >100 21
89 05122197 6.72 714 67.6 -2.7 NIA 0 >20 25 J60 NIA
4 Jl7-122 10/13198 7.20 440 64.0 -68.8 NIA <0.1 >20 25 >100 21
119 05122197 6.87 714 65.7 -J 1.1 NIA 0 >20 50 140 NIA
5 126 -131 10/13198 7.JO 440 63.5 -43.4 NIA 0 >20 25 >100 25
6 128 05102197 6.89 737 68.6 -12.3 NIA 0 >20 25 190 NIA
Bedrock Aquifer Test Borehole ATB-03
l 32-37 101811998 6.9 240 64.2 -31.4 NIA 0 14 25 >100 10
2 52-57 101811998 7.0 260 64.7 -33.4 NIA 0.1 12 25 12 12
3 64-69 1017/1998 6.9 250 62.5 -35.7 NIA 0.1 20 25 >100 10
4 132 -137 10/7/J998 6.9 270 62.3 -9.9 NIA 0.1 >20 150 >100 <10
Bedrock Aquifer Test Borehole ATB-04
I 32-37 101911998 7.4 300 62.6 -58.1 NIA 0 6 25 >100 >IO
2 52-57 IOl9/l 998 7.5 3IO 63.9 -130.0 NIA O. I 8 25 >IOO >IO
3 64-69 IOl9/1998 7.4 320 62.7 -230.3 NIA O. I 6 25 JOO >JO
4 132 -J37 101911998 7.4 340 62.7 -222.7 NIA 0 9 50 >100 >10
S:\1354\Project\97-175 A\Rl Report\Tables\Bed MW Field WQ Table 8-3.xls\Bdrx WQ Table 8-3 Page 1 of 3
Fe
O.J
0.3
0.5
0.5
0.0
0.5
8
0.5
8
0.5
8
1.3
8
2
8
0.5
0.5
0.5
0.5
0.2
0.2
0.2
0.2
Table 8-3
BEDROCK-AQUIFER DISCRETE INTERVAL SAMPLE FIELD WATER-QUALITY DATA
RI PHASE II -BEDROCK TEST BOREHOLES
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-l 75A -
Discrete Sample Sample II Field Parameters Natural Attenuation Parameters
Interval Depth (feet) Date pH SC Temp Redox DO N04 Cl S04 Alk C02
Bedrock Aquifer Test Borehole ATB-06
1 50 -61 11/3011998 8.3 818 68.8 -91 3.2 <0.1 8 25 70 14
2 70 -81 1113011998 8.1 824 63.8 -103 1.4 <0.1 3.2 25 100 20
3 90 -101 1113011998 8.0 764 58.8 -120 1.8 <0.1 8 25 100 12
4 126-137 1112511998 7.9 675 60.5 -91 2.4 <0.1 6 25 100 11
5 143 -154 1112511998 8.0 679 60.5 -99 1.6 <0.1 7 25 100 1
6 180 -191 1112511998 8.0 685 59.3 -118 1.4 0.5 6 25 70 12
7 213 -224 1112411998 8.6 801 67.1 -63.7 NIA <0.1 6 25 100 11
8 224 -235 1112411998 8.4 1,130 68.5 -57 4.2 <0.1 8 25 100 11
9 235 -246 1112411998 8.3 905 67.7 -48 6.0 <0.1 7 25 70 13
10 268 -277 1112311998 8.4 866 64.7 -41 4.2 <0.1 6 25 100 11
Bedrock Aquifer Test Borehole ATB-08
1 49-60 12103198 8.2 678 66.6 -25 3.0 <0.1 6 25.0 100 <10
2 79 -90 12103198 8.1 652 62.2 -44 1.4 <0.1 7 25.0 70 <10
3 94 -105 12103198 7.9 585 56.5 -50 2.4 0.1 6 <25 70 <IO
4 114 -125 12102198 8.4 677 63.1 NIA 4.2 <0.1 3.6 25 100 10
5 131-142 12102198 8.1 77 65.0 NIA 3.4 <0.1 6 25 50 <10
6 155-166 12102198 8.2 844 61.5 NIA 1.8 0.2 3.6 25 70 10
Bedrock Aquifer Test Borehole ATB-09
1 51 -61 11/20/1998 8.2 778 67.5 -47.0 5.1 <0.1 6 25 100 11
2 65 -75 1112011998 8.2 776 61.9 -83.0 2.0 <0.1 6 25 100 11
3 89 -99 1112011998 8.2 664 63.7 -66.0 3.4 <0.1 5 25 70 11
4 111-121 1111911998 7.8 677 65.l -45.3 2.6 NIA NIA NIA NIA NIA
5 135 -145 1111911998 8.1 729 63.2 -92.9 2.4 0.6 5 25 70 11
Bedrock Aquifer Test Borehole ATB-10
1 42-53 12107198 NIA NIA NIA NIA NIA NIA NIA NIA NIA NIA
2 54-66 12107198 7.9 562 65.6 -37.0 2.8 <0.1 4 25 100 10.0
3 78-98 12107198 7.9 597 63.1 -45.0 2.0 0.3 4.5 25 100 11.0
4 102-113 12104198 8.2 575 64.3 -33.0 2.0 <0.1 4 25 100 <10
5 139 -150 12104198 8.4 600 65.3 -21.0 2.2 NIA NIA NIA NIA NIA
S:\1354\Project\97-l 75 A\RI Report\Tables\Bed MW Field WQ Table 8-3.xls\Bdrx WQ Table 8-3 Page 2 of 3
Fe
0.3
1.0
0.3
0.1
0.3
0.2
0.1
0.1
0.1
0.3
<0.1
0.1
0.1
NIS
0.2
0.3
0.3
0.3
0.3
NIA
0.3
NIA
0.1
0.1
0
NIA
Table 8-3
BEDROCK-AQUIFER DISCRETE INTERVAL SAMPLE FIELD WATER-QUALITY DATA
RI PHASE II -BEDROCK TEST BOREHOLES
Discrete Sample
Interval Depth (feet)
1 57. 67
2 79. 89
3 122 -132
4 132-142
5 142. 152
1 38. 48
2 48 -58
3 63. 73
4 80. 90
5 106. 116
6 124. 134
7 144. 154
Notes:
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-175A
Sample Field Parameters
Date pH SC Temp Red ox DO N04
Bedrock Aquifer Test Borehole ATB-11
1111711998 8.2 753 66.8 -51.1 2.1 0.1
1111711998 8.4 732 66.2 -62.5 2.7 0.1
11116/1998 8.0 606 61.7 -204.3 3.6 <0.1
11114/1998 7.7 250 59.5 NIA 2.6 0.0
11114/1998 7.7 240 61.0 NIA 1.1 0.0
Bedrock Aquifer Test Borehole ATB-12
11112/1998 7.6 529 60.2 -110 2.7 <0.1
1111211998 7.65 556 60.9 -58 2.6 <0.1
11112/1998 7.47 589 64.6 -211 2.3 0.1
11112/1998 7.4 577 58.1 -53.3 1.9 <0.1
1111111998 7.4 NIA 58.5 -69.9 2.8 <0.1
1111111998 7.4 NIA 60.1 -240 1.4 <0.1
1111111998 7.67 NIA 61.0 -140 1.4 <0.1
Bedrock Aquifer Existing Supply Well ESW-01
02121197 6.47 300
10/1611998 7.0 70
(1) SC· Specific Conductivity (mSlcm)
(2) Temp -Temperature (F')
65.1
62.0
(3) Redox -Oxidation/Reduction Potential (mv)
(4) DO. Dissolved Oxygen (parts per million ppm)
(5) N04 -Nitrate (ppm)
(6) CL -Chloride (ppm)
(7) S04 -Sulfate (ppm)
-12.0 5.9 0.3
-45.4 NIA 0
(8) Alk • Alkalinity (ppm)
(9) C02 -Carbon Dioxide (ppm)
(10) FE· Ferrous Iron (ppm)
(11) NIS -Not Sampled (Dry Well).
(12) NIA -Not Analyzed.
( 13) A TB -AquAir Test Borehole.
(14) ESW -Existing Supply Well.
Cl
3.2
3
2.8
3.2
2.2
6
7
5.5
6.5
<2
3
7
3.9
3.4
S:\1354\Project\97-175 A\Rl Report\Tables\Bed MW Field WQ Table 8-3.xls\Bdrx WQ Table 8-3 Page 3 of 3
Natural Attenuation Parameters
S04 Alk C02
25 70 13
25 70 13
25 >100 11
25 100 <10
25 70 <10
25 >100 11.5
50 70 13
25 >100 10
25 >100 <10
25 100 <1.0
25 >100 <10
25 >100 <10
50 180 NIA
25 100 >100
Fe
0.1
<0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
6
0.5
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
8.2 MONITORING WELL SAMPLING
October 2001
S&ME Project No. 1354-97-175 A
Following discrete-interval sampling, a single two-inch-diameter, PVC monitoring well was
installed in all boreholes except ATB-01, ATB-03, and ATB-06. The monitoring wells were
completed in either the most permeable fracture zone, or the fracture zone with the highest
concentration of voes in its discrete-interval sample set.
Two wells (AMW-403 and AMW-503) were installed in ATB-03 due to the contaminant
concentrations detected during discrete-interval sampling. ATB-01 and ATB-06 were not
converted because they may be used in the future as a groundwater-recovery wells.
Borehole ATB-05 had to be completed as a monitoring well (AMW-405) before discrete-interval
could be performed due to unstable rock conditions. The existing, abandoned bedrock water-
supply well (ESW-01) was also sampled during the RI. The locations of the wells is shown in
Figure 8-1.
Groundwater samples were collected from wells AMW-404, and AMW-403 and AMW-503 in
October 1998. Groundwater samples were collected from wells AMW-607, AMW-608, AMW-
509, AMW-410, AMW-411, and AMW-612 in April 1999. The groundwater samples were
analyzed by Pace for Method 8260 VOCs.
8.2.1 Volatile Organic Compounds
VOC analytical results are summarized in Table 8-4. VOCs were not detected in the
groundwater samples collected from wells AMW-607, AMW-509, AMW-410, and AMW-411.
Four VOCs were detected in groundwater samples collected from wells AMW-608 and AMW-
612. AMW-608 is located across the Unnamed Creek northeast of the former Facility. AMW-
612 is located southeast of the Former Facility.
8-17
S:\l 354\PROJEC111997\97-l 75A AquAir Il\RI Report\Rl Chapt 8 -02.doc
Table 8-4
BEDROCK AQUIFER MONITORING WELL voe SUMMARY
RI PHASE II -MONITORING WELLS
Remedial Investigation \ Feasibility Study
AquAir Site -Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-175 A
AMW-404 I AMW-40~1 A_~W-503 J ~~-~~71 A~~-~~sl A~~-~~91 A~~-~~o I A~~-~~1 I A:.1:~~~211 2 L
ATB-04 I Al"tl-UJ ATB-07 ATB-08 ATB-09 ATB-10 ATB-11
Volatile Organic Compound 10/21/1998
1 1,1,1-Trichloroethane ND
2 1,1,2,2-Tetrachloroethane ND
3 1,1,2-Trichloroethane ND -4 1,1-Dichloroethane ND -5 1,1-Dichloroethene ND -6 1,2-Dichloroethane ND -7 Benzene ND -8 Carbon Tetrachloride ND
9 Chlorobenzene
10 Chloroform
11 cis-1,2-Dichloroethene
12 Dichlorodifluoromethane
13 Hexachlorobutadiene ND
14 Methylene Chloride ND
15 Tetrachloroethene ND
16 Toluene ND
17 Trichloroethene ND
Total VOCs 2.9
Notes:
4/23/1999 4/23/1999 4/23/1999 4/23/1999 4/23/1999 4/23/1999 II Stand.
110 ND ND ND ND ND ND II 200 I ND ND ND ND ND ND
ND ND ND ND ND
ND ND ND ND ND
ND ND ND ND ND I I I I § I ~~
ND ND
ND ND
ND ND
ND 6.5
ND ND
ND ND
ND ND
ND
(1) All results are in micrograms per liter (ug/L).
(2) VOCs -Volatile Organic Compounds.
(3) ND -Not Detected.
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
ND
0
ND ND
ND ND
ND ND
ND ND
ND ND
ND ND
ND ND
ND ND
ND ND
ND ND
ND ND
ND ND
I 0 I 0
(4) 2L Stand. -North Carolina 15A NCAC 2L Groundwater Quality Standard.
(5) NS -No 2L Standard. llllJll -Concentration Exceeds 2L Groundwater Standard.
0.38
0.3
50
0.19
ND II 70
ND II 1,400
ND NS
ND 5
0.7
1,000
2.8
S:\1354\Project\97-175 A\Rl Report\Tables\Bedrock MW VOC Data Table 8-4.xls\Bedrx AMW's Table 8-4 Page 1
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
PCE and TCE were detected in the AMW-608 (160 µg/L and 16 µg/L, respectively) and AMW-
612 samples (21 µg/L and 8.6 µg/L, respectively). In addition, Chlorobenzene and Toluene were
detected in the AMW-608 sample (6.5 µg/L and 5.4 µg/L, respectively), and 1,2-DCA and
Chloroform (5.7 µg/L and 130 µg/L, respectively) were detected in the AMW-612 sample.
voes were not detected in seven discrete-interval groundwater samples collected from
boreholes ATB-12, now well AMW-612. PeE was detected at a concentration of 44 µg/L in one
of six discrete-interval samples collected from borehole ATB-08, now well AMW-608; no other
voes were detected in the sample set.
Chloroform (1.0 µg/L) and Dichlorodifluoromethane (1.9 µg/L) were detected in the AMW-404
groundwater sample. Previously, PCE and Methylene Chloride were detected in one 1998
discrete-interval sample, and duplicate sample, out of four samples collected from Test Borehole
ATB-04. The 1997 sample set from the test borehole did not contain VOCs.
Up to 16 VOCs were detected in the AMW-403 and AMW-503 samples, both from former test
borehole ATB-03. Eleven of the VOCs were present at concentrations greater than their
respective 2L Standards. TVOC concentrations were 5,259 µg/L and 2,597 µg/L, respectively.
The TVOC concentrations are similar to those reported in the 1998 discrete-interval samples
collected from Test Borehole ATB-03.
8.2.2 Abandoned Water-Supply Well
The abandoned water-supply well was sampled in 1997 and 1998. VOCs were not detected in
the 1997 sample. TCE was detected in the 1998 sample at a concentration of 8.1 µg/L.
8.3 GROUNDWATER ANALYTICAL DATA ANALYSIS
The on-Site Bedrock Aquifer has been affected by chlorinated and non-chlorinated VOCs.
Chloroform, Carbon Tet, and PCE and its degradation products are the primary constituents. As
8-19
S:\1354\PROJECT\l 997\97-175A AquAir 11\RJ Report\RJ Chapt 8 -02.doc
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
many as 12 VOCs are present in the aquifer at concentrations above their respective 2L
Standards.
Figure 8-3 illustrates the configuration of the TVOC groundwater plume in the Bedrock Aquifer;
sample data from October 1998 and April 1999 were used to develop the contour map. The iso-
chemical contour pattern centers on Test Borehole ATB-01 where the maximum groundwater
sample TVOC concentration (202,300 µg/L) was detected. TVOC concentrations decline in all
directions away from Borehole ATB-01; rapid reduction with distance occurs to the west
(up gradient).
Boundary conditions for the TVOC plume have been determined to the west at well AMW-411
(borehole ATB-11), north at well AMW-410 (ATB-10), to the northeast at well AMW-509
(ATB-09) and borehole ATB-06. Plume boundaries to the east at well AMW-404 (ATB-04),
and the south at well AMW-612 (ATB-12) are projected.
The confidence level, however, of the projections is high because sample-analytical data
indicated that the plume migrated into the AMW-404 (ATB-04) area between June 1997 and
October 1998, and into the AMW-612 (ATB-12) area between November 1998 and April 1999.
voes were not detected in the four 1997 discrete-interval samples collected from borehole
ATB-04, but two VOCs (PCE at 2.0 µg/L and Methylene Chloride at 8.5 µg/L) were detected in
one of four discrete-interval samples collected in 1998. The groundwater sample collected from
well AMW-404 in April 1999 contained Chloroform (1.0 µg/L) and Dichlorodifluoromethane
(1.9 µg/L).
At ATB-12 (well AMW-412), VOCs were not detected in seven discrete-interval groundwater
samples collected in November 1998. The AMW-412 groundwater sample collected in April
1999 contained a TVOC concentration of 188 µg/L. The rapid increase in VOC concentration is
believed to indicate rapid groundwater flow conditions in this area.
8-20
S:\l 354\PROJECT\1997\97-175A AquAir II\RI Report\Rl Chapt 8 -02.doc
NORFOLK SOUTHERN RAILROAD -----CREEK \ /UNNAMED
AQUAIR
FACILITY
...M&DW-1
MW-8~
I ----..!~~~9........---~~
SAM NEELY ltCW> ~
t CATE FORMER
PRODUCTIO I BUILDIN~G~______..,.
l
MW-4-+-f l "-----~ l
8+ T AMW-411 l
(ATB-11) l
L ........ ...._ ........... ---------
GRAPHIC SCALE
120 o eo 120 240 "'"""P!---------..l....1----1--1. ____ ,
( IN P'BE'l' )
CMUD SEWER
+ AMW-410
(ATB-10)
0
72,300
DW-2
'-9• ----~ ,oa,ooo
"tw-7
"""
ATB-02
61,540 +
RW-1
5,259
+15,235
AMW-403& AMW-503
(ATB-03
0 +
...___..:..;16::..:5:...A·MW-612 ----n-
(ATB-12)
----
AMW-101r + Q
+ AMW-102
/
/
/
/
/
ATB-06
0
SCALE:
I
0 ~ 44
0 188-$-
AMW-608
(ATB-08)
Q ti
a: g +
EliW-OI
AMW-607
(AlB-07)
LEGEND
~ WATER SUPPLY WELL
DW-1
@ DEL TA UPPER BEDROCK WELL
::+ -(A11H14)
S&ME BEDROCK TEST
BOREHOLE/MONITORING WELL
S&ME BEDROCK TEST BOREHOLE .
TOTAL voes IN MICROGRAMS I
PER LITER. UPPER VALUE IS
DISCRETE-INTERVAL SAMPLE.
LOWER VALUE IS MW SAMPLE
ISO-CHEMICAL CONTOUR LINE
E
ENVIRONMENTAL SERVICES ENGINEERING -TESTING
BEDROCK AQUIFER voe CONTOUR MAP
AQUAIR REMEDIAL INVESTIGATION
CHARLOTIE, NORTH CAROLINA
CHEa<£D BY: DRAVtN BY: MFP AS SHOWN
JOB NO. DA 1E: AGURE NO.
1354-97-175A 11-07-00 8-3
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
The Bedrock Aquifer plume is estimated to have migrated approximately 1,200 feet from the
release source in an easterly ( downgradient) direction. The plume appears to extend to the east
of the Unnamed Creek only at well AMW-404 (ATB-04). Based on the configuration shown in
Figure 8.3, the Bedrock Aquifer groundwater VOC plume is estimated to cover approximately
17 acres, which is smaller than the Shallow Aquifer plume that is estimated to cover about 20
acres.
Based on the discrete-interval hydrogeologic and geochemical data, the vertical extent of
significant groundwater impact in the Bedrock Aquifer appears to be approximately 150 feet
BLS. Fractures below this depth are less numerous and less permeable. Discrete-interval sample
VOC data from Test Borehole ATB-01 at the primary source, the former septic tank and drain
line, indicate a decrease in TVOC concentrations between the sample collected from the 150 feet
BLS depth and the sample collected from the interval of 200 to 250 feet BLS (Refer to Figure 8-
2 and Table 8-1).
The central portion of the Bedrock Aquifer plume appears to be oriented east-west (ATB-01 to
ATB-02) similar to the Shallow Aquifer plume. The linear nature of the central portion of the
plume indicates that a structural feature (fault or joint) in the Bedrock is a primary control over
migration in this area. The movement of the plume into the Area of ATB-12 (AMW-612)
indicates that another permeable fracture system in the bedrock, oriented north-south, is exerting
control in this area.
Borehole ATB-08 (well AMW-608) is located across the Unnamed Creek almost 1,300 feet from
the former Facility. Groundwater flow in the Bedrock Aquifer in this area appears to be moving
from the northeast to the southwest toward the Unnamed Creek. VOCs detected in samples
collected from this borehole and well are believed to indicate the presence of another release
source not related to the former AquAir Facility. PCE, TCE, Chlorobenzene, and Toluene have
been detected in groundwater samples from this location and these voes are constituents of
concern at the former AquAir Facility. However, Chloroform and Carbon Tet, which are the
primary constituents of concern, have not been detected. In addition, borehole ATB-06, where
8-22
S:\1354\pRQJECTl1997\97-l 75A AquAir Il\Rl Report\Rl Chapt 8 -02.doc
RI REPORT -CHAPTER 8
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
no VOCs have been detected, is located between AMW-608 (ATB-08) and the Bedrock Aquifer
plume originating at the former septic tank and drain line.
8-23
S:\1354\PROJECT\1997\97-l 75A AquAir 11\Rl Report\Rl Chapt 8 -02.doc
RI REPORT -CHAPTER 9
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
9.0 INTERIM REMEDIAL MEASURES
Interim Remedial Measures ("IRMs") have been performed at the AquAir Site that include:
• Demolition of the shells for the former production and laboratory
buildings in May 1999;
• Removal and disposal of the former septic tank, including contained
fluids, and drain line on March 13, 2000;
• Demolition and removal of the floor slab and underlying soil of the former
production building in May and July 2000;
• Removal of vanadium-pentoxide pellets from areas east, north, and
northwest of the former Facility in February 1999, and;
• Installation and operation of a Bedrock Aquifer groundwater recovery and
treatment system ("IRM GWR System") beginning in November 2000 to
gain hydraulic control of the on-Site groundwater plumes.
Groundwater recovery is still continuing. The locations of the IRMs are shown in Figures 9-1
and 9-2.
9.1 BUILDING DEMOLITION
James W. Clark Company ("Clark") demolished the former laboratory and production buildings
in May 1999 under contract to SNL. Clark recycled recovered metal components and disposed of
the remaining materials (tin, concrete block, wood, wiring, etc.) at a construction debris landfill.
9-1
S:\l 354\PROJECTl! 997\97-175A AquAir II\Rl Report\Rl Chapt 9 -02.doc
1 ~-""=--"""--"""J'f._/,-VALADIUM PELLET AREA ~--=-'"""'.>;J:~-A EXCAVATE TO 0.5' f""""'_,;:y~""-~~-~ ~---=-==*--,\ ,--",
\\ \\==-=-....;;.~7" 7---\\ /// \' \, l\ / \ ~ -----~ // \ i1 --------\ ," \ ;\( ---------------,\; \ \,
'ii ,--J-, \ \
\\ 1 \ '\ ' \\ ' 1----------+---1 'i ', ',
\\ \ \ \ \ \\ ',
\\ \ \ : \ \ \ \
\1 \ \ j \ \ ', \ \ \L i1 L-----, ---' \ \ \
~' \ '11 \ ',
\1 I DEMOLISH FORMER ti'-' ii I \1 '
\t ----LABORATORY "' \ _j -----"' \ .............................................................................................................. *=--·=·······:-: .. -................................................................................... . .......................................................................................................................................................................................... ,, .......................................... \ ............................ \ ................................................... . ~--------~ -I \ ~'
---\'
/
r-------\ ~.... \, , ,;;NADIUM PELLET AREA
,--(""-\ \ \ \ \ ,/ EXCAVATE TO 0.5'
I
-----{ l
\ I t I I I i
* \
I L
\ : \ \ \ \,./
'1, \ \ \ '-J-_ __:
l \__. .. -" ' --'/\~ \ \ s.-r\ '.
\, \-----~~SEPTIC TANK I '
DEMOLISH AND\ \ :_ \ \ EXCAVATE TO EXCAVATE 2' \ : i--i--1
\ ·. \1 \ I ---
1 j \1 \ \ --
\:. !I i I I \I~ I I
,-------------______________ J l \\ '\ \ \
12' --------,,
\
I
I VANADIUM
\EXCAVATE
><
\ FORMER \1 \ I I
' PRODUCTION! ~ '\ \ \
\
111
\
1
BUILDING . __ ------------1 \ \ r--· ! -I \ *' \ \
. tONCREtE \ \ \ \
:. PAD I I \ I I I \ I I
I \ I I
I \ I I
I \ I I . I I
I I I
i ' \ \ ---/DEMOLISH AND \ , 1 1---
\ EXCAVATE 2' \ \\. 1 MANAGE TOP 1.0' AS
\, 11 \ --~ HAZARDOUS WASTE
I ' I I --I
' \
\ ---------···1 \ ___ . __ _
~ \ --
I
I
I
I
I I
I I
I
I
I
I
I
I _,
1 j I \ I
)\(\, ; \ _J y\ VALADIUM PELLET AREA , , --1-I' EXCAVATE TO 0.5'
j ~-I I \ "-•: -----/'--I I l---~------0 L---------
PELLET AREA
TO 0.5'
+ SPARGE OR SVE WELL OR PIEZOMETER
-$-SHALLOW AQUIFER MONITORING WELL + DEL TA TYPE II MONITORING WELL
)( FENCE
)( /~ GATE
-------------ESTIMATED EXTENT OF VANADIUM PELLE
SCALE:
GRAPHIC SCALE
~ o a ~ ~ ~~~-~-~...J~~,~~'----'
( IN FEET )
E
IRM SOIL MANAGEMENT AREAS
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
DRAWN BY: CHECKED BY:
AS SHOWN MFP
FORMER AQUAIR F ACIUTY --
FORMER
LABORATORY
BUILDING
-
\
--\
'. ~
\_ ."" . /UNNAMED CREEK
-\_~"" "' .. · ... _
TYPICAL GROUND
WATER RECOVERY WELL -
\\ "'""· "' "' "' \. "' "'
\\
\'
RW-1 \
(ATB-02)
'.
"'
y:, -;n
/FUTURE NPDES
/ DISCHARGE
-....... -.......
TEMPORARY -....._
CMUD DISCHARGE-....._
~GROUNDWATER
TREATMENT BLDG.
NORFOLK SOUTHERN
RR CROSSING
\ ..
\
~ \). ~w
\ \,\ ~ ~ ;}, \J \.\ l
\
;
\
\ l
SCALE:
IRM BEDROCK AQUIFER
GROUNDWATER RECOVERY SYSTEM
AQUAIR REMEDIAL INVESTICGA TION
CHARLOTTE, NORTH CAROLINA
1" = 100' DRAWN BY: CHECKED BY: CLO
JOB NO. DATE: RGURE NO.
1354-97-1958 10-22-01 9-2 ---------------------'----"'------==--=--'-----'----_;;_---""---'
RI REPORT -CHAPTER 9
AQUAIR REMEDIAL INVESTIGATION
9.2 SEPTIC TANK REMOVAL
October 2001
S&ME Project No. 1354-97-175 A
On March 31, 2000, Concord Industrial Services, Inc. ("CISCO") of Concord, North Carolina,
removed the septic tank and drain line from the western side of the former production building
under contract with SNL. Contained fluids were pumped out prior to removal.
The septic tank measured approximately 12 feet long, 4 feet wide, and five feet deep. The drain line
extended south of the septic tank approximately 50 feet. The excavated material, concrete and some
surrounding soil were disposed of at the Browning Ferris, Inc. ("BPI") Charlotte Motor Speedway
("CMS") Landfill in Harrisburg, North Carolina.
9.3 CONCRETE SLAB AND SOIL REMOVAL
In May 2000, CISCO removed the concrete slab at the former production building under contract
with SNL. The concrete was segregated into non-hazardous and potential hazardous portions
based upon yellow chromium staining. CISCO disposed of the non-hazardous portion of the
concrete slab, approximately 87 tons, at the BPI CMS Landfill.
The potentially hazardous portion, approximately 31 tons, of the concrete slab was disposed of
by Sentury Reagents of Rock Hill, South Carolina, at the Safety-Kleen (Pinewood), Inc.
("Safety-Kleen") facility in Pinewood, South Carolina. The concrete was microencapsulated
prior to disposal.
In July 2000, CISCO removed surficial soil within the footprint of the former production
building under contract with SNL. Approximately 1,511 tons of soil were transported to BPI
CMS Landfill for disposal.
9-4
S:\1354\PROJECTll997\97-175A AquAir 11\Rl Report\RI Chapt 9 -02.doc
RI REPORT -CHAPTER 9
AQUAIR REMEDIAL INVESTIGATION
9.4 V ANADIUM-PENTOXIDE PELLETS REMOVAL
October 2001
S&ME Project No. 1354-97-175 A
In February 1999, under contract to SNL, CISCO excavated and removed vanadium-pentoxide
pellets that had been disposed of at the former facility. Pellets were scattered on the ground
surface east, north, and northwest of the former production building. In some places, pellets had
been buried at shallow depths ofless than 18 inches. Approximately 2,500 tons of material were
transported to BFI CMS Landfill for disposal.
9.5 BEDROCK AQUIFER GROUNDWATER RECOVERY SYSTEM
Construction of the Bedrock Aquifer Groundwater Recovery System ("GWRS") occurred from
June 1999 to October 2000. The GWRS went into operation on November 1, 2000; startup
testing was performed during the month of October. Figure 9-2 depicts the general layout of the
GWRS.
The GWRS uses Test Borehole ATB-02 (RW-1) located just west of the Norfolk Southern Track
(Figure 9-2) in the central portion of the Bedrock Aquifer plume as the recovery well and an on-
Site shallow-tray air stripper for groundwater treatment. Discharge polishing was initially
performed by activated carbon, but was discontinued when the air stripper demonstrated that it
could achieve the desired contaminant-reduction goals. The GWRS discharges to the Unnamed
Creek under NPDES Permit No. NC 0086673.
Construction of the GWRS was performed by:
• CISCO and Clark Construction Company ("Clark") of Kannapolis, North
Carolina -the installation of the influent and effluent pipelines, the
manholes at the railroad track crossing, the rip-rap discharge point in the
Unnamed Creek, access roads, treatment building slab, and security fence;
• Stroupe Electrical Contractors, Inc. ("Stroupe") of Charlotte, North Carolina
-the installation of electrical lines, panels, and controls;
9-5
S:\1354\PROJECT\J 997\97-175A AquAir 11\Rl Report\Rl Chapt 9 -02.doc
RI REPORT -CHAPTER 9
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
• Product Level Control, Inc. of Burnsville, Minnesota -assembled the
treatment system, and monitoring and control systems, including the Process
Logic Controller ("PLC") and telemetry system; and
• S&ME Charlotte, North Carolina -the installation of mechanical equipment
including recovery-well pump, transfer pumps, storage tank, shallow-tray air
stripper, and carbon canisters.
9.5.1 Aquifer Test
During the SSI, S&ME conducted a 72-Hour aquifer (pump) test in Bedrock Test Borehole
ATB-02 on June 23-30, 1997. Groundwater from the test was discharged to the CMUD
combined sewer following treatment through an air stripper and activated carbon.
The drawdown (pumping) portion of the test was initiated on Monday, June 23, but was aborted
after approximately 12 hours due to electric generator failure. The test was restarted at 1 :00 uu
on Wednesday, June 25, following reconfiguration of the treatment system and concluded at~
PM on Saturday, June 28. The recovery portion of the test was concluded on Monday, June 3
Pump rates during the test ranged from 10 to 12 gpm during the first 48 hours to 14 to 15;
during the last 24 hours. Approximately 58,000 gallons were pumped, treated, and discharg{
an average pump rate of 13.2 gpm during the test.
Maximum drawdown in the pumping well (ATB-02) was 19.2 feet at the conclusion of the
aquifer test. Water-level data from the wells and piezometers indicated that the Shallow Aquifer
is in direct hydraulic connection with the Bedrock Aquifer. In addition, measurement data
indicated that the radius of influence of the aquifer test extended beyond the well and piezometer
network. Initial evaluation of drawdown data indicated that the radius of influence extended
more than 700 feet in the east-west direction and more than 450 feet in the north-south direction.
Three samples of the pump discharge were collected during the aquifer test for VOC analysis at
24 hours (Sample APT-1-01), 48 hours (Sample APT-1-02), and 72 hours (Sample APT-1-03).
The analytical results are summarized in Table 9-1.
9-6
S:\1354\PROJECTll 997\97-175A AquAir II\RJ Report\RI Chapt 9 -02.doc
Sample
Depth
32
50
89
119
128
Average
APT-1-01
APT-1-02
APT-1-03
PT Aver
Notes:
Benz CDisul CTet
0.0075 <0.5 1.2
0.0091 0.31 2
0.0088 0.32 1.9
<0.05 0.37 1.6
<l < l 1.8
I 0.0051 I 0.2 I 1.7 I
0.0056 0.56 9.4
0.0055 0.42 14
< 0.005 0.32 13
0.0037 0.433 12.13
C-form
Table 9-1
Bedrock Aquifer Test-Groundwater Sample VOC Results
AquAir Remedial Investigation
Charlotte, Mecklenburg County, North Carolina
S&ME Project No. 1354-97-175 A
Method 8260 Volatile Organic Compounds
C-benz 1-DCA 2-DCA 1-DCE c-2-DCE t-2-DCE HCB MChlor Toi 1,2-PCA 2,2-PCA PCE 1-TCA 2-TCA
Bedrock Test Borehole ATB -02 (Sampled May 23, 1997 -Pump Test Samples Collected June 26 -28, 1997)
18 0.32 0.059 1.3 <0.25 0.18 0.0054 <0.5 3.8 0.38 0.013 < 0.005 3.6 <0.25 0.026
25 0.27 0.042 1.5 0.046 0.21 0.0054 <0.01 4.7 0.35 < 0.005 O.Ql8 3.4 0.13 0.026
27 0.25 0.045 1.6 0.045 0.21 0.0054 <0.01 3.9 0.34 < 0.005 0.016 3.6 0.12 0.025
30 0.28 <0.05 1.7 <0.05 0.25 <0.05 <0.1 3.7 0.47 <0.05 <0.05 2.4 0.14 <0.05
26 < 1 <l 1.5 <l <I < l <2 4.6 < l <I < 1 4.3 < 1 <0.l
25.2 I 0.224 I o.02n I t.52 I 0.0182 I 0.11 I 0.0032 I 0 I 4.14 I 0.308 I 0.0026 I 0.0068 I 3.46 I om8 I o.o 154 I
23 0.32 O.Q35 1.5 0,078 0.18 0.005 0.024 3.6 5.6 <0.005 O.Ql8 4.0 0.15 0.014
20 0.32 0.04 1.6 0.12 0.22 0.0061 O.Q21 5.5 0.52 <0.005 O.Ql5 4.2 0.21 0.014
15 0.2 0.03 1.3 0.11 0.15 < 0.005 0.019 3.5 0.36 < 0.005 o.or5 3.1 0.15 0.013
19.3 0.28 O.Q35 1.467 0.103 0.183 0.0037 0.0213 4.2 2.16 0 0.016 3.77 0.17 0.0137
(I) Analyses performed by PACE Analytical Services, Inc., of Huntersville, NC.
(2) Results are in milligrams per liter (mg/L), parts per million.
(10) M Chlor -Methylene chloride.
(11) PCE -Tetrachloroethene.
(19) mlp-Xyl -m-and p-Xylenes.
(20) < -Less than.
(3) VOCs -Volatile organic compounds. (12) TC A -Trichloroethane.
(13) TC E -Trichloroethene.
(14) c -cis.
(21) N D -Not detected.
(22) H B C -Hexachlorobutadiene.
(23) APT -Pump Test Sample.
Total
TCE m/p-Xyl voes
1.2 < 0.005 30.0909
I.I 0.0052 39.1217
1.1 < 0.005 40.4852
0.93 < 0.05 41.84
1.1 < 1 39.3
1.09 I 0.00 I I 38.17
1.2 < 0.005 49.6896
1.3 <0.005 48.5116
I < 0.005 38.267
1.17 0 45.489
(4) Sample Depth -Feet below land surface.
(5) C Disul -Carbon disulfide.
(6) C Tet -Carbon tetrachloride. (15) t -trans. (24) PT Aver -Average VOC concentration for Pump Test Samples.
(7) C-benz -Chiaro benzene.
(8) D C A -Dichloroethane.
(9) D C E -Dichloroethene.
S:\1354\Project\97-175 AIRJ Report\Tables\Table 9-1 Pump Test VOC Results..Ql.xls
(16) Toi -Toluene.
(17) Benz -Benzene.
(18) PC A -Tetrachloroethane.
Page I
RI REPORT-CHAPTER 9
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
During the pump test, six chlorinated VOCs (PCE, TCE, Methylene Chloride, 2-DCA,
Chloroform, and Carbon Tet) were detected in all samples at concentrations exceeding 1.0 mg/L.
The six chlorinated VOCs were present in all discrete-interval samples with the exception of
TCE in one sample collected from a depth of 119 feet BLS.
Toluene was detected at a concentration 5 .6 mg/L in the initial pump-test sample (APT-1-01 ),
but declined as the test progressed. Final Toluene concentrations were similar to concentrations
detected in five of the six discrete-interval samples.
Total VOC concentrations decreased through time from 49.7 mg/Lin the 24-hour sample (APT-
1-01) to 3 8.3 mg/L at the conclusion of the test (Sample APT-1-03). Total VOC concentrations
in 24-and 48-hour pump-test samples were higher than the discrete-interval sample
concentrations, but the total VOC concentration of the 72-hour sample (APT-1-03) was similar
to the discrete-interval sample average of 3 8 mg/L.
9.5.2 IRM GWRS Operation
Since initiation of sustained operation in November 1, 2000, the IRM GWRS has maintained a
pumping rate of 11 to 12 gpm and has recovered, treated and discharged approximately
4,800,000 gallons of affected groundwater as of September 1, 2001. The system has been out of
operation less than 8.0 percent of the time due to routine maintenance, and unplanned shutdowns
due to power outages and PLC programming.
Table 9-2 presents groundwater-level data on October 26, 2000 prior to the start of groundwater
recovery, approximately two weeks after startup (November 16, 2000), and after 10.5 months of
operation. All wells except DW-3 and AMW-108 exhibit groundwater-level declines due to the
GWRS operation; the water level in AMW-108 has risen about 4.7 feet.
9-8
S:\1354\PROJEC1\l 997\97-l 75A AquAir II\Rl Report\RI Chapt 9 -02.doc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Table 9-2
IRM WATER LEVEL DRA WDOWN DATA
AQUAIR REMEDIAL INVESTIGATION
S&ME PROJECT NO. 1354-97-175 A
Well DTW Draw DTW
Number 10/26/00 11/16/00 Down 09/14/01
Shallow Aquifer Wells
AMW-101 16.88 17.61 0.73 19.93
AMW-102 9.04 10.44 1.40 11.45
AMW-103 5.18 4.68 -0.50 8.57
AMW-104 7.33 7.55 0.22 9.16
AMW-105 5.23 4.64 -0.59 6.55
AMW-106 8.32 7.72 -0.60 10.29
AMW-107 4.41 4.33 -0.08 5.76
AMW-108 3.00 9.35 6.35 8.28
AMW-109 10.6 10.55 -0.05 12.63
AMW-110 9.81 11.93 2.12 12.75
MW-1 16.32 16.78 0.46 19.03
MW-2 17.16 17.85 0.69 20.10
MW-3 11.26 17.10 5.84 14.25
MW-4 19.26 19.50 0.24 20.88
MW-5 15.97 16.49 0.52 18.72
MW-6 11.84 13.27 1.43 16.10
MW-7 14.75 DRY DRY DRY
MW-8 15.48 15.55 0.07 17.17
MW-9 10.53 12.72 2.19 14.43
MW-10 11.16 DRY DRY DRY
SVE-01 9.30 DRY DRY
S:\1354\Project\97-175 A\Rl Report\ Tables\ Table 9-2 GWL DD-01.xls 1 of 2
Draw down
10/26/00 11/16/00
3.05 2.32
2.41 1.01
3.39 3.89
1.83 1.61
1.32 1.91
1.97 2.57
1.35 1.43
5.28 -1.07
2.03 2.08
2.94 0.82
2.71 2.25
2.94 2.25
2.99 -2.85
1.62 1.38
2.75 2.23
4.26 2.83
1.69 1.62
3.90 1.71
1
2
3
4
1
2
3
4
5
6
7
8
9
10
1
2
3
Table 9-2
IRM WATER LEVEL DRA WDOWN DATA
AQUAIR REMEDIAL INVESTIGATION
S&ME PROJECT NO. 1354-97-175 A
Well DTW Draw DTW
Number 10126100 11116100 Down 09/14/01
Upper Bedrock Aquifer Wells
DW-1 15.74 15.69 -0.05 17.59
DW-2 10.73 13.06 2.33 14.72
DW-3 28.60 28.61 0.01 28.20
DW-4 18.77 19.57 0.80 21.71
Bedrock Aquifer Wells
AMW-403 4.11 15.36 11.25 16.72
AMW-503 11.62 12.19 0.57 18.59
AMW-404 7.45 7.39 -0.06 8.74
AMW-405 8.72 10.10 1.38 11.34
AMW-507 11.46 11.70 0.24 13.05
AMW-608 13.96 14.37 0.41 15.38
AMW-509 7.08 7.53 0.45 8.61
AMW-410 8.46 8.05 -0.41 10.23
AMW-411 21.99 22.29 0.30 23.93
AMW-612 11 14.92 3.92 16.56
Bedrock Aquifer Test Boreholes
ATB-01 16.06 17.18 1.12 19.29
RW-1 (ATB-02) 7.84 26.30 18.46 26.30
ATB-06 6.98 7.19 0.21 8.38
Notes: DTW -Depth to Groundwater in Feet.
Drawdown in Feet.
S:\1354\Project\97-175 A\RI Report\ Tables\ Table 9-2 GWL DD-01.xls 2 Of 2
Drawdown
10/26/00 11/16/00
1.85 1.90
3.99 1.66
-0.40 -0.41
2.94 2.14
12.61 1.36
6.97 6.40
1.29 1.35
2.62 1.24
1.59 1.35
1.42 1.01
1.53 1.08
1.77 2.18
1.94 1.64
5.56 1.64
3.23 2.11
18.46 0.00
1.40 1.19
RI REPORT -CHAPTER 9
AQUAIR REMEDIAL INVESTIGATION
October 2001
S&ME Project No. 1354-97-175 A
Monitoring Well AMW-108 is located adjacent to the Unnamed Creek, downstream from the
GWRS NPDES discharge point. The stream has had no surface-water base flow since 1999.
Discharge from the GWRS is probably infiltrating into the Shallow Aquifer from the streambed
in the area of AMW-108 producing the measured water-level nse. The cause of the
groundwater-level rise in DW-3 (about 0.4 foot) in not known.
Drawdown in the Bedrock Aquifer approximately two weeks after GWRS initiation is shown in
Figure 9-3. The drawdown cone is approximately elliptical in shape with the longitudinal axis
oriented north-south. The cone is elongated to the south indicating a preferential flow zone
probably due to structural control, i.e. a zone of interconnected bedrock fractures.
The size of the draw-down cone, based on the one-foot contour line, is approximately 700 feet east-
west, and 850 feet north-south. Hydraulic effects from operation of the GWRS appear to extend to
all Bedrock Aquifer wells and test boreholes except at AMW-410 (ATB-10) located north-
northwest of the Recovery Well RW-1 (ATB-02).
Drawdown in the Bedrock Aquifer approximately 10.5 months after GWRS initiation is shown in
Figure 9-4. The draw-down cone is distinctly elongated to the south with a drawdown zone of more
than 4.0 feet apparently extending well beyond the well/test borehole network. The draw-down
cone extends farther to the west than to the east based on the two-foot contour line; however,
groundwater levels in all Bedrock Test Boreholes appear to have declined at least 1.5 feet.
The size of the draw-down cone, based on the two-foot contour line, is approximately 1,000 feet in
the east-west direction. The contour line does not close to the south so the extent of hydraulic
control in that direction is not known.
9-11
S:\l 354\PROJECT\1997\97-17 5A AquAir 11\Rl Report\Rl Chapt 9 -02.doc
NORFOLK SOUTHERN RAILROAD -------
AQUAIR
FACILITY
H-'·!--·2' ~0.05
0.07
SAM N£EL Y ftOAD \
+o.30
AMW-411
(ATB-11)
FORMER
LABORATORY
BUILDING
FORMER
PRODUCTION
BUILDING ...----.....__ ......
GRAPHIC SCALE
-+-0.52
t~·~\y-.:: ....
120 o eo 120 240 ~-§i_;J_-~-~....l~-1--1--.... 1
{ IN FEET)
CMUD SEWER
WOODS
-$=-0.6
AMW-106
+5.84
...
-$=0.41
AMW-410
(AlB-10)
~2.33
2.19
N 0.01 c~~.43
...
0
11.25 +0.!57
AMW-403&AMW-3
(AlB-03)
+3.92
AMW-612
{AlB-12)
+1.4
AMW-102
+o.45
AMW-509 WOODS
(AlB-09)
AMW-10~3
-0.5 +0.21
AlB-06
SCALE:
JOB NO.
+s.35
AMW-108
+0.41
AMW-608
(AlB-08)
DW-1
+0.24
AMW-607
(AlB-07)
LEGEND
WATER SUPPLY WELL
@ DELTA UPPER BEDROCK WELL
llW-.3 ,..-t
01
DELTA SHALLOW WELL + S&ME SHALLOW WELL T S&ME BEDROCK TEST
<All-04> BOREHOLE/MONITORING WELL
... ~
-,.-S&ME BEDROCK TEST
-io-DRAWDOWN CONTOUR LINE
IN FEET
1.4 DRAWDOWN (FEET) 11/16/01
-3.6 NEGATIVE DRAWDOWN (FEET) 11/16 1
+-0.06
AMW-404
(AlB-04)
~0.08
AMW-107
E
BEDROCK AQUIFER
11/18/2000 12 WEEKSJ
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
CHECKED BY: AS SHOWN ORA~ BY: MFP
DAlE: AGURE NO. 1354-97-175A 11-07-00 9-3
NORFOLK SOUTHERN RAILROAD ---
AQUAIR
FACILITY
J...,...,,
I
WOODS
FORMER
LABORATORY
BUILDING
/---SEWER ra.. CUT
: ;,:+!CORY
--~~--<l'-'--~4>-~
SAM Hm.Y ROAD \
FORMER
P OOUCTION
BUILDING
r>'i.····~·@
2.94
GATE
....---~-'
+1.94
AMW-411
(ATB-11)
GRAPHIC SCALE
·,
( OOMCllf1'E _.i
2.71
SVE-
DRY M\?···1
120 o eo 120 240 ~~~---~~-'~--,~~1 iiiiiiiiiiiiiiiiii~1
( IH FEET )
-f.23
~ATB-01
AJW-101
WOODS
CMUD SEWER
~-77
(ATB-10)
2.6~
AMW-405
(ATB-05)
...
0
12.61 +6.97
AMW-403&AMW-3
(ATB-03)
+5.56
AMW-612
(ATB-12)
+241
AMW-102
+1.53
AMW-509
(ATB-09)
AMw-1oi ~+1.40 3.39
ATB-06
WOODS
AMW-109
WOODS
\ +5.28
AMW-108
+1.42
AMW-608
(ATB-08)
ESW-01
+1.59
AMW-607
(ATB-07)
LEGEND
~ WATER SUPPLY WELL
DW-1
@ DELTA UPPER BEDROCK WELL
w-3
-.t.-DELTA SHALLOW WELL ~101 + S&ME SHALLOW WELL T S&ME BEDROCK TEST
CAlll-04> BOREHOLE/MONITORING WELL
A~ T S&ME BEDROCK TEST
DRAWDOWN CONTOUR LINE
IN FEET
1.3 DRAWDOWN (FEET) 11/16/01
-1.1 NEGATIVE ORAWDOWN (FEET) 11/16 1
+1.35
AMW-107
+1-29
AMW-404
(ATB-04)
!BEDROCK AQUIFER DRAWDOWN
9/14/2001 110.5 MONTHSJ
AQUAIR REMEDIAL INVESTIGATION
CHARLOTTE, NORTH CAROLINA
SCALE: AS SHOWN DRA\llN BY: MFP CHECKED BY:
JOB NO. DA TE: AGURE NO. 1354-97-175A 11-07-00 9-4