NCD062555792_20011018_Sigmons Septic Tank Service_FRBCERCLA RISK_Screening Level Risk Assessment Steps 1 and 2 - RI FS-OCR

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SCREENING LEVEL
ECOLOGICAL RISK ASSESSMENT
STEPS 1 and 2
REMEDIAL INVESTIGATION/
FEASIBILITY STUDY
SIGMON'S SEPTIC TANK SITE
STATESVILLE, IREDELL COUNTY,
NORTH CAROLINA
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
Contents
LQ Introduction ....................................................................................................................... I-I
2.0 Screening-Level Ecological Risk Assessment. ................................. : ............................... 2-1
2.1 Environmental Setting and Contaminants ..................................................................... 2-1
2.1.1 Facility Description ................................................................................................ 2-1
2.1.2 Ecological Habitats ................................................................................................ 2-4
2.1.3 Potential Receptors .............................................................................................. 2-10
2.1.4 Contaminants at the Site ...................................................................................... 2-12
2.1.5 Contaminant Fate and Transport .......................................................................... 2-25
2.2 Potentially Complete Exposure Pathways ................................................................... 2-28
2.3 A biotic Screen ............................................................................................................. 2-30
2.3.1 Exposure Point Assumptions ............................................................................... 2-30
2.3.2 Data Quality Considerations ................................................................................ 2-30
2.3.3 Exposure Assumptions ........................................................................................ 2-30
2.4 Screening Level Risk Characterization ....................................................................... 2-31
2.4.1 Risk Characterization from Soils ......................................................................... 2-32
2.4.2 Risk Characterization from Sediment.. ................................................................ 2-34
2.4.3 Risk Characterization from Surface Water .......................................................... 2-34
2.4.4 Risk Characterization from Groundwater ............................................................ 2-34
2.5 Uncertainty .................................................................................................................. 2-39
2.5.1 Habitat Characterization and Sample Representativeness ................................... 2-39
2.5.2 Data Quality Issues for Each Media .................................................................... 2-40
2.5.3 Use of Maximum Concentrations for Exposure .................................................. 2-40
2.5.4 Bioavailability ...................................................................................................... 2-40
2.6 Conclusions of the SERA ............................................................................................ 2-40
3.0 References ......................................................................................................................... 3-1
~able 2-1.
\able 2-2.
\___Table 2-3.
-Table 2-4.
I.._ Table 2-5.
"Table 2-6.
"Table 2-7.
Tables
Listed State and Federal Threatened and Endangered Species .................................. 2-11
Ecological Screening for Contaminants Analyzed for in Surface Soil. ..................... 2-14
Ecological Screening for Contaminants Analyzed for in Sediment .......................... 2-17
Ecological Screening for Contaminants Analyzed for in Surface Water .................. 2-21
Preliminary Contaminants of Potential Concern in Surface Soil .............................. 2-33
Preliminary Contaminants of Potential Concern in Sediment.. ................................. 2-35
Preliminary Contaminants of Potential Concern in Surface Water ........................... 2-37
TC-I Draft
Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
Figures
Figure 2-1. Site Location Map ........................................................................................................ 2-2
Figure 2-2. Site Layout Map ........................................................................................................... 2-3
Figure 2-3. Aerial Photo and Site Habitat.. ..................................................................................... 2-5
Figure 2-4. Sample Location Map .................................................................................................. 2-6
Figure 2-5 Surface Water Pathway Location Map ........................................................................ 2-8
Figure 2-6 Potentially Complete Exposure Pathways ................................................................. 2-29
Appendices
Appendix A. Checklist for Ecological Assessment/Sampling
TC-2 Draft
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
1.0 Introduction
This screening-level ecological risk assessment (SERA) presents an evaluation of the analytical data
generated during investigations performed during site investigations conducted between 1998 and
1999 as it relates to ecological risk at the Sigmon's Septic Tank (SSTS) site, Statesville, Iredell
County, North Carolina. The methodology used in this assessment will be based on and will
comply with the guidance available from the U.S. Environmental Protection Agency (EPA) Region
4 for conducting ecological risk assessments (EPA 1999). This SERA also follows the latest
guidance described in the Ecological Risk Assessment Guidance for Superfund: Process for
Designing and Conducting Ecological Risk Assessments (EPA 1997). The guidance outlines eight
steps to complete the ecological risk assessment process at Superfund sites. The SERA completes
Steps 1 and 2 of the Process Document:
Step 1 -Screening -Level Problem Formulation and Ecological Effects Evaluation
Step 2 -Screening -Level Exposure Estimate and Risk Calculation
A Scientific/Management Decision Point (SMDP) meeting is recommended following completion
of Step 2. The purpose of the SMDP meeting is to bring the risk managers and trustees into the risk
assessment process at an early stage to streamline the process. The objective of the SMDP meeting
is to determine whether a full ecological risk assessment is required and to focus any future risk
assessment on those ecological issues that are significant to the risk managers and trustees.
When the conclusions of the initial two steps of the process, the SERA, conclude that further action
is warranted, Step 3 of the process, Ecological Risk Assessment Problem Formulation, is initiated.
Step 3 lays the groundwork for conducting a final Baseline ERA (BERA).
SERAs are simplified risk assessments that can be conducted with limited data by assuming values
for parameters which are lacking. At the screening-level, it is important to minimize the chances of
cone! uding that there is no risk when, in fact, a risk may exist. Therefore, for exposure and toxicity
parameters for which site-specific information may be lacking, assumed values should always be
biased toward overestimating risk. This ensures that sites that have an ecological risk are further
evaluated and provides a defensible conclusion for the elimination of contaminants and exposure
pathways based on negligible risk.
I - I Draft
Sigmon's Septic Tank Site October 18, 2001
Screening-Level Ecological Risk Assessment
The SERA will provide the risk manager with information sufficient to make one of the following
three determinations:
• There is adequate information to conclude that ecological risks are negligible, and therefore,
there is no need for remedial activities on the basis of ecological risk.
• The information is not adequate to fully evaluate potential ecological risks, and more data is
needed before a decision concerning the need for remedial activities can be made. At this point,
the next step in the ecological risk assessment process would be to continue on to Steps 3
through 8.
• Ecological risks determined through Steps I and 2 can be managed by implementation of a
specified control mechanism (a remedy) and continuation of the ecological risk assessment
process would not provide any additional value.
1-2 Draft
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
2.0 Screening-Level Ecological Risk Assessment
This section includes a discussion of the environmental setting, identification of potentially
complete exposure pathways, screening of contaminated media against EPA Region 4 ecological
screening criteria, preliminary risk characterization, and a discussion of uncertainty. The objectives
of this section are to compile and summarize relevant environmental information from the site
history and from previous investigations conducted at the site.
I 2.1 Environmental Setting and Contaminants
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The following sections summarize the environmental setting and the contaminants detected in
investigations conducted at the site. The characterizations are based on available reports and
literature, and a site visit conducted by Black & Veatch during September 2001. A summary of the
findings of the site visit is also presented in Appendix A (EPA Checklist for Ecological Assessment
and Sampling).
2.1.1 Facility Description
The SSTS site encompasses 15.35 acres and is located in Iredell County, North Carolina. The
site consists of three buildings: the home of Mary Sigmon, the work locations of Environmental
Services Inc. (current name of the septic tank service), and a storage shed. The east, west, and
south. sides of the property are fenced and signs are posted warning of the disposal area.
However, access to the lagoon area is possible through a break in the fence.
The SSTS site is located at 1268 Eufola Road, approximately 5 miles southwest of Statesville, in
Iredell County, North Carolina. The SSTS site is bordered by Eufola road to the north, Lauren
Drive to the south, and private landowners to the east and west. Figure 2-1 shows the site
location. The geographic coordinates of the SSTS site are 35°43 '02" North latitude and
80°58'20" West longitude. Figure 2-2 shows the site layout.
The Sigmon family has owned and operated a septic tank pumping and waste operation since
1970. Sigmon's Septic Tank Service disposed of septic wastes in eight to ten unlined lagoons on
the south section of the 15-acre property during 1978 through 1992. The lagoon area consists of
approximately 1.2 acres.
2-1 Draft
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REF.
FIGURE
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REF. -USGS 7 .5 t.ilNUTE SERIES TOPOGRAPHIC t.iAP: TROUTt.iAN, NC 1993.
SITE LAYOUT t.iAP
SIGt.iON'S SEPTIC TANK SITE
STATESVILLE, IREDELL COUNTY, NORTH CAROLINA
1" = 600'
FIGURE
2-2
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
Many groundwater investigations were conducted between 1978 to 1992 by the North Carolina
Department of Natural Resources and Community Development and the North Carolina division
of Environmental Management (DEM). Two residences have been advised not to drink the
water due to the results of the groundwater investigations. In 1995, the DEM required closure of
the lagoons. The lagoon sludges were excavated to a depth of 10 feet and mixed with sawdust.
The lagoons were back-filled with soil from the north portion of the site. The waste from the
lagoons was then piled onsite near the lagoon area. Mary Sigmon, daughter of the late owner,
Henry Sigmon, operates Sigmon Environmental Services (SES) from the property. Mary
Sigmon's business consists of temporarily storing septic wastes in above ground tanks onsite.
Sludges are then periodically removed and transported to a wastewater treatment plant for
disposal.
2.1.2 Ecological Habitats
Black & Veatch conducted a site visit on September 26, 2001, to characterize the ecological habitats
on the site. Observations of habitat and wildlife were conducted during mid-morning to the mid-
afternoon for a period of approximately 6 hours (9:00 AM to 3:00 PM). During the site visit it was
observed that there are potentiaJly four terrestrial habitats and five aquatic habitats. The terrestrial
habitats include: 1) a mixed residential forest in the northern portion of the site; 2) a maintained
lawn around the onsite pond and Mary Sigmon's office area; 3) an old field in the center of the site
extending south to the lagoon/waste pile area; and 4) a shrub/scrub area along the southern border of
the site. The aquatic habitats include: 1) a wetland complex, comprised of a pond, which contains
emergent wetlands along its edges; 2) a drainage ditch along the southern border of the site; 3) four
wetland complex offsite ponds (Lamberth, Williams, Siwinski, and Davidson); 4) two unnamed
intermittent streams flowing in a southwest directions from the site; and 5) an unnamed perennial
stream approximately 1.5 miles southwest of the site. An aerial photograph, presented as Figure 2-3,
shows the location of ecological habitats. A topographic map, presented as Figure 2-4, shows the
1999 Expanded Site Investigation (ESI) sample locations. Appendix A presents a completed
"Checklist for Ecological Assessment and Sampling" (EPA, 1997).
There are two surface water pathways and one drainage swale discharging from the site. The first
surface water pathway begins at the onsite pond, flows southwest and drains into the Lambreth
pond. Lambreth discharges into an intermittent stream that flows from Williams pond to the
Siwinski pond and eventually connects with an unnamed perennial stream flowing into the Catawba
river. During the site visit, a drainage swale of surface water runoff from the lagoon/waste pile area
2-4 Draft
-------------------
Site Boundary •••
Emergent Wetland Boundary -
Sigmon's Septic Tank Site
Screening-Level Ecological Risk Assessment
Statesville, Iredell County, North Carolina
Figure 2-3
Aerial Photograph
Ecological Habitats
~-BLACK & VEATCH
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REF'S. -USGS 7.5 MINUTE SERIES TOPOGRAPHIC MAP: TROUTMAN, NC 1993; NCDENR, ESI REPORT SIGMON'S SEPTIC TANK SERVICE, MARCH 2000.
SIGMON'S SEPTIC TANK SITE
STATESVILLE, IREDELL COUNTY, NORTH CAROLINA
HISTORICAL SAMPLING LOCATIONS
DECEMBER 1999 ESI
1" = 600'
FIGURE
2-4
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Sigmon's Septic Tank S ite October 18, 200 I
Screen ing-Level Ecological Risk Assessment
that eventually flowed into the Williams pond was also evident. The second surface water pathway
begins at the drainage ditch located south of the lagoons and drains into Davidson pond. Davidson
pond discharges into an unnamed intermittent stream that connects to the unnamed perennial stream
flowing into the Catawba river. A topographic map, presented as Figure 2-5, indicates the above
referenced surface water pathways.
2.1.2.1 Mixed Residential Forest Habitat. The mixed residential forest is located in the
northern portion of the site, extending from Mary Sigrnon's residence to the onsite pond. The
mixed residential forest is approximately 2.5 acres in size and is dominated by a variety of white
oak (Quercus alba), bur oak (Quercus macrocarpa), and red maple (Acer rubrum). It is speculated
from prior investigations that no site related activities have occurred in this area.
2. 1.2.2 Maintained Lawn Habitat. The maintained lawn area is located around the onsite pond,
extending south to Mary Sigrnon's office structure. The maintained lawn area is approximately 3.5
acres in size and is dominated by lawn grasses. It is speculated from prior investigations that no site
related activities have occurred in this area.
2. 1.2.3 Old Field Habitat. The old field encompasses a majority of the site, beginning south of
Mary Sigrnon's office structure, proceeding through the central portion of the site, and extending
into the lagoon and waste pile area. The old field is approximately 8.6 acres. The northern portion
of the old field is dominated by a variety of grasses in the initial stages of succession. As indicated
in previous investigations no prior waste disposal activities have occurred in this portion of the site.
However, six aboveground tanks, which currently store waste are located in the eastern portion of
the old field area.
The southern portion of the old field consists of various grasses, herbaceous vegetation, and a few
standing white oaks (Quercus alba). A small area of stressed vegetation was observed in the center
of the lagoon area (i.e. the grasses were much shorter than in the other areas) with large bare spots
and a charcoal like topsoil. Various unidentified species of spiders and birds were observed in and
around the old field area. Rabbit droppings and other unidentified fecal matter were also observed
in this portion of the site. Historically waste was disposed of in the lagoon area and later excavated
to the waste pile area.
2-7 Draft
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Intermittent Stream (Surface Water Pathway I)
Intermittent Stream (Surface Water Pathway 2)
REF. -USGS 7 .5 MINUTE SERIES TOPOGRAPHIC MAP: TROUTt.AAN, NC 1993. 1" = 3,000'
Surfuce Water Pathway
Sigmon's Septic Tank Site
Statesville, Iredell County, North Carolina
Figure
2-5
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Leve\ Ecological Risk Assessment
2.1.2.4 Shrub/Scrub Habitat. The shrub/scrub habitat is located in southern portion of the site
extending from the eastern to the western boundaries of the site. This area encompasses
approximately I acre. Two pits approximately 3 feet deep and 8 feet wide can be found in the
shrub/scrub habitat in the southeastern comer of the site.
2.1.2.5 Wetland Complex-Onsite Pond/Emergent Wetland Area. The pond is located in
the northern portion of the site and is about 1.25 acres in size. A majority of the pond was dry
except for the northeastern comer, which contained approximately 2 inches of water. In the
northeastern portion of the pond emergent wetland vegetation dominated by rushes (Juncus species)
was observed. Herbaceous vegetation sparsely covers the remaining side wall areas and various
grasses cover the bottom of the pond.
2.1.2.6 Drainage Ditches. One drainage ditch runs along the southern perimeter of the site and
continues offsite east for approximately I 000 feet. The ditch traverses under driveways and is
connected by a few small cylinder culverts, eventually draining into the Davidson pond. Another
drainage ditch, not site-related, runs west from a paved road and also drains into the Davidson pond.
The drainage ditches were approximately 2 feet wide, covered by lawn grasses, and contained no
standing water during the site visit.
2.1.2.7 Wetland Complex-Offsite Ponds!Submergent and Emergent Wetlands
(Davidson, Lambreth, Williams, & Siwinski). The Davidson pond is located southeast of the
site and is approximately I acre in size. The Lambreth, Williams and Siwinski ponds are located
west of the site and range in size from approximately I to 2.5 acres. During the site visit, small
duckweed (lemna valdiviana) covered approximately 80% of the Davidson and Lambreth ponds.
Wetland vegetation dominated by bog species (Juncus species) was observed on the edges of the
ponds. Numerous tadpoles were also observed in the Lambreth and Davidson ponds. The depths of
the Davidson and Lambreth ponds were approximately 2 to 3 feet. During the site visit, visual
inspection of the Williams and Siwinski ponds was not possible because residents were not
available to grant access to these areas.
2.1.2.8 Intermittent Stream. Two unnamed intermittent streams drain the offsite ponds. Both
streams flow approximately 1.5 miles southwest of the site. The intermittent streams have
numerous curves with defined banks and flow through mixed wooded areas. The stream channel is
approximately 3 to 4 feet wide with well-vegetated side slopes of I :2 or less and a height of 4 to 5
2-9 Draft
Sigmon's Septic Tank Site October I 8, 200 I
Screening-Level Ecological Risk Assessment
feet. The substrates of the streams were covered with debris. Large particles of rusted metal and
drums were found throughout the surface water pathway of the intermittent stream draining from
the Davidson pond. During the site visit, neither of the streams contained standing water.
2.2.2.9 Perennial Stream. The two unnamed intermittent streams that drain from the site
converge to form an unnamed perennial stream that drains directly into the Catawba River,
approximately I mile downstream. The surface water pathway of the stream was not visually
inspected during the site visit; however, the following is typical of what would be seen for a stream
this size. The perennial stream is generally straight with defined banks and flows through pasture
and old field areas. The stream channel is approximately 3 to 5 feet wide with well-vegetated side
slopes of I :2 or Jess and a height of 5 to 6 feet. The stream substrate in this area is mostly cobbles
and silt. Several fish and macroinvertebrates would be expected to be present in this stream.
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2.1.2.10 Threatened and Endangered Species. Information from the North Carolina I
Natural Heritage Program (NCNHP) was reviewed to identify important areas and species that have
regulatory protection under Federal and State of North Carolina laws. While site-specific
information for these species and habitats at the site was unavailable, NCNHP has published lists of r
these species that have been recorded in Iredell County. This list is presented in Table 2-1. Table 2-
1 also identifies those threatened species, endangered species, and species of special concern, or
their habitat, that was observed in the vicinity of the site. There were no threatened or endangered
species observed during ecological reconnaissance investigations. The highfin carpsucker
(Carpiodes velifer) is listed as a state species of special concern in the Catawba River. The Duke
Power State Park was also identified as a natural area present within a three-mile radius of the site.
Suitable habitat for most of the threatened species, endangered species, and species of special
concern was available throughout portions of the site.
2.1.3 Potential Receptors
A variety of ecological receptors could be supported by the ecological communities at the site. The
following receptors, by habitat, may potentially be exposed to contaminants in surface soils,
sediment, and surface water in the habitats of the site:
2-10 Draft
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Table 2-1
Listed State and Federal Threatened and Endangered Species
And Species of Special Concern in Iredell County, North Carolina
Sigmon's Septic Tank Site, Iredell County, North Carolina
Scientific Name Common Name Federal State Status Observed
Status Onsite?
FISH
Carpiodes velifer IHighfin Carpsucker I N I SC I No
REPTILES
C/emmys muhlenbergii Bog Turtle I T(S/A) I T ' No
INSECT
Pseudiron centra/is a mayfly N SR No
Homoeoneuria cahabensis a mayfly N SR No
Macdunnoa brunnea a mayfly N SR No
BIRDS
Coragyps atratus Black Vulture N SC No
Lanius ludovicianus ludovicianus Loggerhead Shrike N SC No
MAMMALS
Neotoma magister Allegheny Woodrat FSC I SC I No
VASCULAR PLANTS
Amorpha schwen·nii Piedmont Indigo-bush N SR No
Baptisia a/bescens Thin-pod White Wild Indigo N SR No
Barberis canadensis American Barberry N SR No
Botrychium jenmanii Alabama Grape Fern N SR No
Carex conoidea Cone-shaped Sedge N T No
Carex projecta Necklace Sedge N C No
Delphinium exaltatum Tait Larkspur FSC E-SC No
Dodecatheon meadia var meadia Eastern Shooting Star N SR No
He/enium brevifolium littleleaf Sneezeweed N E No
Helenium pinnatifidum Dissected Sneezeweed N SR No
Lotus helleri Carolina Birdfoot-trefoil FSC C No
Magnolia macrophyl/a Bigleaf Magnolia N SR No
Oenothera perennis Perennial Sundrops N C No
Quercus prinoides Dwarf Chinquapin Oak N C No
Sida elliottii N C No
Silphium connatum Virginia Cup-plant N SR No
Silphium perfoliatum Northern Cup-plant N SR No
Thermopsis mollis sensustricto Appalachian Golden-banner N SR No
NON-VASCULAR PLANTS
Rhachithecium perpusillum !Budding Tortula I N C No
Onsite
Habitat?
I No
I No
Yes
Yes
Yes
Yes
I Yes
I Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
No
Yes
Yes
Yes
I Yes
FSC;: Federal "Species of Concern", atso called "Species at R1sk". Formerly defined as a taxon under consIderatIon for which there Is insufficient
information to support listing: formerly designated as a Candidate 2 (C2) species.
T(S/A) = Threatened due to similarity of appearance.
N = Not listed
SC== Defined as any species of plant in North Carolina which requires monitoring but which may be collected and sold under regulations adopted
under the provisions of [the Plant Protection and Conservation Actj. Defined as any species of wild animal native or once-native to North Carolina
which is determined by the Wildlife Resources Commission to require monitoring but which may be taken under regulations adopted under the
provisions of this Article.
T== Defined as any native or once-native species of wild animal and/or resident species of plant which is likely to become an endangered species
within the foresable future through all or significant portion of its range, or one that is designated as a threatened species pursuant to the
Endangered Species Act.
C== Defined as a species which are very rare in North Carolina, generally with 1-20 populations in the state. generally substantially reduced in
numbers by habitat destruction.
E:::: Defined as any species or higher taxon or plant whose continued existence as a viable component of the State's flora is determined to be in
jeopardy. Defined as any native or once-native species of wild animal whose continued existence as a viable component of the State's fauna is
determined by the Wildlife Resources Commission to be in jeopardy or any species of wild animal determined to be an 'endangered species'
pursuant to the Endangered Species Act.
SR:::: Defined as any species which are very rare in North Carolina. generally with 1-20 populations in the state, generally substantially reduced in
numbers by habitat destruction. Defined as any species which has not been listed by the NC Wildlife Resources Commission as an Endangered,
Threatened. or Special Concern species, but which exists in the state In small numbers and has been determined by the NC Natural Heritage
Program to need monitoring.
Sigmon's Septic Tank Site October 18, 2001
Screening-Level Ecological Risk Assessment
Maintained lawn, old field, and shrub scrub (primarily soils):
• Terrestrial producer (vegetation) communities.
• Terrestrial (soil-dwelling) invertebrate communities.
• Herbivorous wildlife (e.g. voles) communities.
• Verrnivorous wildlife (e.g. shrews, moles, lizards) communities.
• Carnivorous wildlife (e.g. snakes, raptors) communities.
• Omnivorous wildlife (e.g. robins, raccoons, red fox) communities.
Wetland complex habitats, ponds, and streams (primarily sediment and surface water):
• Aquatic producer (vegetation) communities (emergent wetlands and ditch)
• Benthic (sediment-dwelling) invertebrate communities (ponds).
• Fish (including predator and prey species) communities (ponds).
• Herbivorous wildlife (e.g. muskrat, nutria, mallard) communities (ponds).
• Insectivorous wildlife (e.g. sandpipers) communities (ponds).
• Piscivorous wildlife (e.g. kingfishers) communities (ponds).
2.1.4 Contaminants at the Site
This SERA presents a preliminary evaluation of the analytical data generated during the expanded
site investigation (ES!) in December of 1999 by the State of North Carolina Department of
Environment and Natural Resources (NCDENR) (NCDENR, 1999). A preliminary assessment site
investigation (PA/SI) was conducted in 1997 by the NCDENR; however, the raw data was not
available and is not presented in this SERA (NCDENR, 1997). Data hits from the PA/SJ are
discussed in the uncertainty section, Section 2.5.
During the ES! sampling event, 7 surface and/or subsurface soil samples, 8 sediment samples, 6
surface water samples, and 8 groundwater samples were collected and analyzed. Sample
locations for the ES! data are shown on Figure 2-4. Groundwater will be addressed in a
qualitative fashion by this SERA due to the possibility that groundwater could emerge as surface
water in the off site ponds west and southeast of the site.
2-12 Draft
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
2.1.4.1 Surface Soil. Seven surface and subsurface soil samples were collected from the waste
pile and lagoon area that is located in the southern portion of the old field habitat. Soil sample SST-
09-WS and SST-10-WS were collected from Oto! foot below land surface (bis), SST-11-WS was
collected from 1 to 3 feet bis; and SST-12-WS, SST-13-WS and SST! 13-WS were collected from 1
to 4 feet bis. Seven of these samples were analyzed for Target Analyte List (TAL) inorganics, and
Target Compound List (TCL) organic compounds including volatile organic compounds (VOCs),
and semivolatile organic compounds (SVOCs) (also known as extractables) by an EPA-approved
laboratory under the EPA Contract Laboratory Program (CLP). Contaminants detected in the
surface and subsurface soils of the site include VOCs, SVOCs, and inorganics. These sample
results are summarized in Table 2-2.
2. 1.4.2 Sediment. Eight sediment samples were collected from the Davidson pond, drainage
ditches, unnamed intermittent streams, and an unnamed perennial stream. All eight of these
samples were analyzed for T AL inorganics, and TCL organic compounds by an EPA-approved
laboratory under the EPA CLP. Contaminants detected in these sediments include several SVOCs
and metals. These sample results are summarized in Table 2-3.
2. 1.4.3 Surface Water. Six surface water samples were collected from an offsite pond, three
intermittent streams, and one perennial stream. All six of these samples were analyzed for T AL
inorganics and TCL organic compounds by an EPA-approved laboratory under the EPA CLP.· Two
VOCs and several metals were detected in these surface water samples. These sample results are
summarized in Table 2-4.
2.1.4.4 Groundwater. Samples of groundwater were collected from 8 wells on and offsite
during the 1999 ES! sampling event. All eight of these samples were analyzed for T AL inorganics
and TCL organic compounds by an EPA-approved laboratory under the EPA CLP. Several VOCs
and metals were detected in these samples. While there are no direct ecological exposure pathways
to groundwater (groundwater emerges in surface water, which is then the exposure media),
groundwater from the site may recharge the ponds, streams, and wetland complexes on and offsite.
As shown on the table in Section 2.4.4, several metals exceed surface water screening criteria. If
groundwater recharges to the ponds, streams, and wetlands, these contaminants may be future
contaminants of potential concern (COPCs) in surface water.·
2-13 Draft
- - --- -- ---&iii iiii
Table 2-2
Ecologlcal Screening of Contaminants Analyzed for In Surface Solla
Sigmon'& Septic Tank Service Site
Statesvllle, Iredell Countv, North Carolina
1999 ESI lnvestlnatlon
I I I I USEPA
Rirgion 4
Reportrd Soil Frequency of
Conctntntion Frequency Scrttnina Scrttnina ~t«tiOfl OHi'
Constituent SS--09 SS-010-WS SS-011·\\'S SS-012-WS SS-OlJ..WS SS-113-WS SS-017-SL SS-018-SL ..... or Drtrctlon Valun HQ Strttnlna Value,
Rnult IQ Rnoll I Q Rtsult I Q Rnult I Q Rnult I Q Rtsolt IQ Rn11lt Q Rault I Q
VOLATILES (UG/KG)
l,1,1-lRICHLOROETHANE 16 U 16 U ll U 21 U 18 U 18 U 13 UJ 12 UJ 12UJ. 21U W8
1,1,2,2-TEIB.ACHLOROElHANE 16 U 16 U 13 U 21 U 18 U 18 U I) UJ 12 UJ \ZUJ-21U W8
1,l,2-lRICHLOR0-1.2.2-TRIFLUOROETHANE (FREON 11 16 U 16 U 13 U 21 U 18 U 18 U ll lJl 12 UJ \ZUJ-2IU 0'11
1,1,2-TRICHLOROEIBANE 16 U 16 U 13 U 21 U 18 U 18 U 13 UJ 12 UJ 12UJ. 2JU &8
I, 1-DICI-Il.OROElHA.'ffi 16 U 16 U 13 U 21 U 18 U 18 U iJ UJ 12 lJl 12UJ -21U 0'11
I, 1-DICHLOROETIIENE (1, 1-DICHLOROElHYLENE) 16 U 16 U 13 U 21 U 18 U 18 U I) UJ 12 lJl 12UJ-21U O'll
1,2,4-lRJCHLOROBENZENE 16 U 16 U ll U 21 U 18 U 18 U ll lJl 12 UJ 12UJ-21U &8
1,2-DIBROMO-J-CHLOROPROP ANE (DBCP) 16 U 16 U JJU 21 U 18 U 18 U 13 lJl 12 lJl 12UJ-21U O'll
1,2-DIBROMOElHANE(EDB) 16 Ur ,~u 13 U 21 U 18 U 18 U 13 UJ 12 UJ 12UJ-21U W8 '
1,2-DICHLOROBENZENE 16 U\ -250 --6 ,. 21 U 18 U 18 U I) UJ 12 UJ 12UJ-2SO 2111 lt)fJ 1 • Jn,i /rlA h'-'l
1,2-DICHLOROETHANE 16 U --f6U ll U 21 U 18 U 18 U ll lJl 12 UJ 12UJ-2\U O'll 400 -
1,2-DICHLOROPROPANE 16 U 16 U ll U 21 U 18 U 18 U 13 lJl 12 lJl 12UJ-2\U "' 700000
1,3-DICHLOROBENZENE -7 ,. -1• -ll U 21 U -76 --170 -13 lJl 12 lJl l2UJ -170 ... -1,4-DICHLOROBENZENE -24 --120 -_ .. --10 ,. -290 --100 --ll Ull -12 UJI 12UJ-290 ..
ACETONE 16 U -21 --67 --43 --160 --130 -13 lJl 12 UJ 12UJ-160 518
BENZENE 16 U 16 U
_,. -21 U -\~ J■ -14 ,. 13 UJ !2 UJ 12UJ -18 318 ,0 0.36 W8
BROMODJCHLOROMElHANE 16 U 16 U JJU 21 U 18 U 18 U 13 UJ 12 UJ 12UJ -21U "' BROMOFORM 16 U 16 U 13 U 21 U 18 U 18 U ll lJl 12 UJ 12UJ -2lU 0/8
BROMOME'IHANE 16 U 16 U ll U 21 U 18 U 18 U ll lJl 12 UJ l2UJ -21U 0'11
CARBON DISULFIDE
_, ,. -· ,. -7 ,. -· ,. -8 ,. -· ,. 13 UJ 12 lJl 12UJ-9J 6'8
CARBON 1ElRACHLORIDE 16 U 16 U JJU 21 U 18 U 18 U 13 lJl 12 UJ l2UJ -21U O'll 1000000
CHLOROBENZENE -II ,. -,. 74 -10 ,. ,ooo J 200 ll lJl 12 UJ 12UJ -SOOOJ .. ,0 JOO 318
CHLOROElHANE 16 UJ 16 UJ 13 UJ 21 UR 18 UR 18 UR 13 UR 12 UR 12UJ -21U 08
CHLOROFORM 16 U 16 U JJU 21 U 18 U 18 U ll lJl 12 lJl 12UJ -21U 08 I
CHLOROME'IHANE 16 U 16 U 13 U 21 U 18 U 18 U 13 UJ 12 UJ 12UJ -21U W8
CIS-1,2-DICHLOROElHENE 16 U 16 U ll U 21 U 18 U 18 U 13 UJ 12 UJ l2UJ -21U 08
CIS-1,J-DICHI..OROPROPENE 16 U 16 U ll U 21 U 18 U 18 U ll Ul 12 lJl I2UJ -21U 08
CYCLOHEXANE 16 U 16 U
_,, -21 U 18 U 18 U ll lJl 12 UJ 12UJ -39 118 100 0.39 O'll
DIBROMOCHLOROMETiiANE 16 U 16 U JJU 21 U 18 U 18 U ll lJl 12 UJ l2UJ -21U 0'11
DICHLORODIFLUOROMETHANE 16 UJ 16 UJ ll UJ 21 UJ \8U1 18 UJ 13 UJ 12 lJl 12UJ -21U W8
ETIIYL BENZENE 16 U -•1 -300 21 U 190 280 13 UJ 12 lJl 12UJ -300 ... ,0 6 318
ISOPROPYLBENZENE 16 U 16 U -12 i• 21 U -II ,. -16 ,. ll lJl 12 UJ 12UJ-t6J 318
ME1HYL AC ETA 1E 16 U 16 U ll U 21 U 18 U 18 U 13 UJ 12 UJ l2UJ -21U 08
MElHYL Bt.m1. KETONE 16 U -270 -JJU 21 U 18 U 18 U 13 UJ 12 UJ 12UJ -21U 118
MElHYL ETHYL KETONE 16 U 16 U -34 -21 U -76 --70 -13 UJ 12 UJ ]2UJ -76 318
ME1HYL ISOBIJI"t1. KElONE 16 U 16 U ll U 21 U 18 U 80 13 UJ 12 lJl 12UJ -80 118
MElHYL T-BUTYL EIBER (MTBE) 16 U 16 U JJU 21 U 18 U 18 U 13 UJ 12 UJ 12UJ -21U &8
MElHYLCYCLOHEXANE
_, ,. -40 -_,so -21 U
_,. --38 -13 lJl 12 UJ 12UJ -180 S/8
MElHYLENE CHLORIDE 16 U 16 U 13 U 21 U 18 U 18 U 13 UJ 12 UJ 12UJ -21U W8
STYRENE 16 U 16 U 13 U 21 U 18 U 18 U -· ,. 12 lJl 12UJ -41 118 100 0.04 W8
TEIRACHLOROETHENE {1ETRACHLOROETifYLENE) 16 U -· ,. JJU 21 U 18 U 18 U ll lJl 12 lJl 12UJ -SJ 118 10 o., &8
TOLUENE -17 -63 210 -· ,. 7000 J 290 13 lJl 12 UJ 12UJ -7000J 6'8 ,0 140 ~8
TOTAL XYLENES 16 U 200 !JOO _1, ia 730 200 13 UJ 12 lJl 12UJ -1300 S/8 ,0 26 ~8
TRANS-1,2-DICHLOROElHENE 16 U 16 U ll U 21 U 18 U 18 U 13 lJl 12 lJl 12UJ -2JU 08
lRANS-1,3-DICHLOROPROPENE 16 U 16 U 13 U 21 U 18 U 18 U ll lJl 12 UJ 12UJ -21U W8
lRlCHLOROETiiEI','E (lRTCHLOROElHYLENE) 16 U 16 U 13 U 21 U 18 U 18 U 13 UJ 12 UJ 12UJ -21U &8 I
TRJCHLOROFLUOROME'IHANE 16 U 16 U JJU 21 U 18 U 18 U \3UJ 12 UJ 12UJ -21U 08
VIN\1. CHLORIDE 16 U 16 U ll U 21 U 18 U 18 U 13 lJl 12 UJ 12UJ -21U O'S
-----------aa -Table 2-2
Ecological Screening of Contaminants Analyzed for In Surface Solis
Slgmon's Septic Tank Service Stt&
Statesville, Iredell Countv, North Carolina
1999 ESI lnvestlaation
USEPA
Rrgion 4
R,p,,rtot Soil Frequency of
Cormrntratloo Frequency S(rrening Scrttning Dettttlon ovel'
Constituent SS-09 SS-010-WS SS-011-WS SS-OtZ-\\'S SS-OIJ.\\'S SS-113-WS SS-017-SL SS-011-SL ... ,. of Dfttttion \'alun HQ Scrttning Values
Rnnlt I Q Rnult Q Rnnlt Q Rnult IQ Rnult IQ Rnult I Q Rnu11la Rnull Q
EXTRACT ABLES (UG/KG)
(3-AND/OR 4-)MElHYLPHENOL 17000 U ~'17200 111: 430 UR ~000 !illi ~23000 !Ii ~23000 i1§,1 450 U 430 U 430UR -48CXXl 418
1,1-BIPHENYL !!'Ml700 Jil! 17000 U 430 UR ifflllti2JOO Ji!ll Ml!2400 Jl!ll ~3500 Jlil 450 U 430 U 430UR -17000 418
2,4,S-TRICHLOROPHENOL 42000 U 42000 U 1100 UR 40000 U 45000 U 45000 U 1100 U 1100 U I \OOUR-4SOOOU "" 4000
2,4,6-TRICHLOROPHENOL 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR -ISOOOU 0/8 10000
2,4-DICI-Il.OROPHENOL 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR -!SOCKlU 0/8
2,4-DlMEIBYLPHENOL 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR -J8COOU 0/8
2,4-DINITROPHENOL 42000 U 42000 U 1100 UR 40000 U 45000 U 45000 U 1100 U 1100 U I IOOUR. 450000 0/8 20000
2,4-OINITROlULUENE 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-ISCOOU 0/8
2,6-DINITROTOLUENE 17000 U 17000 U 430 UR HiOOO U 18000 U 18000 U 450 U 430 U 430UR-lSOOOU 0/8
2-CHLORONAPl-flHALENE 17000 U 17000U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-!SOOOU 0/8
2-CHLOROPHENOL 17(XXJ u 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR - I 8000U 0/8
2-MElHYL-4,6-DINITROPHENOL 42000 U 42000 U llOO UR 40000 UJ 45000 lJ1 4,000 U 1100 U 1100 U l lOOUR -45000U 0/8
2-METI-fYLPHENOL 17CXXI U 17000 U 430 UR 16000 U 18000U 18000 U 450 U 430 U 430UR-18000U 0/8
2-NITROANIUNE 17000 U 17000 U llOO UR 16000 U 18000 U 18000 U 1100 U 1100 U 1 lOOUR-18000 0/8
2-NITROPHENOL 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-18000U W8
3,3'-0ICHLOROBENZIDINE 17000 lJ1 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR - 1 SCOOU ""
3-NITROANILINE 42000 U 42000 U llOO UR 40000 U 45000 U 45000 U 1100 U 1100 U l lOOUR-45000U 0/11
4-BROMOPHENYL PHEN'1.. E'THER 17000 U 17000 U 430 UR 16000 UJ 18000 lJ1 18000 U 450 U 430 U 430UR-JSCOOU ""
4-Cl-ll,OR0-3-METHYLPI-IESOL 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-180000 0/11
4-CHLOROANILINE 1111~ ,. llill3~ ,. lil!i/ll!89 ,. --,. lli!!il:4000 ,. llmll9800 JJI! 450 U 430 U 430U -140001 618
4-CHLOROPHENYL PHEN'1.. ETHER 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 V 430 U 430UR-!80CXJU 0/8
4-NITROANILINE 42000 U 42000 U llOO UR 40000 U 45000 U 45000 U 1100 U 1100 U I IOOUR -45000U 0/8
4-NITROPHENOL 42000 U 42000 UJ 1100 UR 40000 U 45000 U 45000 U 1100 U 1100 U I IOOUR -4SOOOU W8 7000
ACETOPHENONE 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-!SOOOU 0/8
ATRAZINE 17000 U 17000 U 430 UR 160CJO UJ 18000 lJ1 18000 U 450 U 430 U 430UR -18000UJ ~8 oos
. ~ BENZALDEHYDE 17000 U 17000 U 430 UR _,ooo JIii 18000 U 18000 U i"Ji.'11:!4'W 111< ~i,52 111 430UR-440J )/8
BENZVL BIJI'YL PHTHALAlE 1)220000 Jill 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR -2200001 118
81S(2-CHLOROFIHOXY)METHA.'JE 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 4S0 U 430 U 430UR-J8000U W8
815(2-CHLOROETifYL) E1HER 17000 U 17000 U 4)0 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-1SOOOU 0/8
815(2-CHLOROISOPROPYL) E1liER 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-18000U W8
B15(2-ElHYLHEXYl) PHlHALAlE iw240000 JIii R38000 lllll _,20 ,. DlOOOOO 1111 -97000 Iii ~7:W()O Ill! 450 U 430 U 4300-100000 6/8
CAPROLACTAM 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 4JOUR-18000U 0/11
CARBAZOLE 17000 U 17000 U 430 UR 160CJO UJ JSOOO UJ 18000 U 450 U 270 J 430UR-18000U 0/8
DIBENZOFURAN 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 68 J 430UR-!SOOOU 0/8
DIElH'1..PHTHALATE 17000 U 17000 U 430 UR 16000 U 18000 U -~~47000 ~ 450 U 430 U 430UR. 47000 118 100000 0,47 0/8
DIME1H'1.. PHlHALA lE 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U ~460 11111 430UR-460 118 200000 0.002 W8
DJ-N-Blln'LPHTIIALA lE 17000 U 17000 U 430 UR 16000 UJ 18000 UJ 18000 U 450 U 430 U 430UR-18000U 0/8 200000
D1-N-OCITLPHlHALA lE 17000 UJ 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR. 18000U 0/8
HE.XACHLOROBE..,_ZENE (HCB) 17000 U 17000 U 430 UR 16000 lJJ 18000 UJ 18000 U 450 U 430 U 430UR -ISOOOUJ "" 2.5
HEXACHLOROBUTADIENE 17000 U 17000 UJ 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR-l8000U 0/8
HEXACHLOROCYCLOPENTADIENE (HCCP) 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 lJJ 430 UJ 430UR -18000U 0/8 10000
HEXACHLOROEIBANE 17000 U 17000 UJ 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430UR -18000U 0/8
ISOPHORONE 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430U-18000U 0/8
NITRO BENZENE 17000 U 17000 U 430 UR 16000 U 18000 U 18000 U 450 U 430 U 430U. ISOOOU 0/8 40000
N-NITROSODI-N-PROPYLAMINE 17000 U 17000 U 430 UR 16000 U !SOCIO U 18000 U 450 U 430 U 430U-18000U (Wll
N-NITROSODIPHEN'1..AMINE/DIPHENYLAMINE 17000 U 17000 U 430 UR 160CJO UJ 18000 VJ 18000 U 450 U 430 U 430U-ISOOOU ""
PENTACHLOROPHENOL 42000 U 42000 U llOO UR 40000 UJ 45000 UJ 45000 U IIOOU 1100 U I IOOU-45000UJ 0/8 2
PHE. ... OL 17000 U 17000 U 430 UR 1700 J 18000 U 18000 U 450 U 430 U 430U-1700J 118 so l4 118
POLYCYCLIC AROMATIC HYDROCARBONS (PAlh) (UG/KG)
2-METH'1..NAPHTHALENE TtnJ6001J11!f7!j§IIJ9001J~I 430IUR IR~f2200U~l;it::'..:27001J J~IA1~.c4JOOIJi-!:I 450IU I 430lU I 430UR-43001 1 518 I I 1
ACENAPHTI-tE...,_E I l7000IU I 170001U I 430IUR I 160CJOIU I 18000 U JSOOOIU I 450IU l[~IJOUlttl 430UR -1301 1 118 1 20000 1 0.007 1 0/8
-- --
Constituent
ACENAPHlHYLENE
ANIHRACENE
BENZO(A)ANlHRACENE
BENZO(B)FLUOR.ANTHENE
BENZO(GHI)PER YLENE
BENZO(K)FLUORA."ffitENE
BENZO-A-PYRENE
CHRYSENE
DIBBa()(A.H)ANTHRACENE
FLUORANTTIENE
FLUORENE
IND ENO (1,2,3-CD) PYRENE
NAPHTI-IALENE
PHENANlliRE'ffi
PYRENE
TOTAL PAfb (SUM OF DETECTIONS ABOVE)
METALS (MG/KG)
ALW.fINUM
ANTIMONY
ARSENIC
BARIUM
BERYLLlUM
CADMIUM
CALCIUM
CHROMIUM
COBALT
COPPER
IRON"
LEAD
MAGNESfiJM
MANGANESE
rNICKEL
POTASSRJM
SELENIUM
SILVER
SODIUM
IBALLIUM
TOTAL MERCURY
VANADIUM
ZINC
NOTES.
Q • Data Qualifier.
U -Undetected.
J -Estimated value.
R -Rejected data
NA -Nol analyzed.
--
ss--09
Result Q
17000 U
17000 U
17000 UJ
17000 UJ
17000 UJ
17000 UI
17000 UJ
17000 UJ
17000 UI
1700:> U
17000 U
17000 UI
3700 I
1100 J
17000 UI
9100
31000
2.2 UJ
-3:2 -230
072 U
4.6 J
-4100 -75
IOUJ
200)
23000
180 J
-4100 t~
290
74
ill!!l3200 Ill!
0.96 UJ
3.,
!!19380 -0.63 UJ
0.26
49
870
--- ---Tsble 2-2
Ecological Screening of Contaminants Analyzed for In Surface Solts
Slgmon's Septic Tank Service Site
Statesvllle Iredell County North Carollna
1999 ESI lnvesHnatJon
SS-010-WS SS-011-WS SS-012-WS SS-013-WS SS.113-\\'S SS-017-SL S5-011-SL
Reault Q Rnult Q Rnult Q Rnult Q Rnult Q tu.ult Q ...... Q
17000 U 430 UR 16000 U \800) U 18000 U 450 U 430 U
17000 U 430 UR 16000 UJ 18000 UJ 18000 U 450 U 250 J
17000 U 430 UR 16000 U !8000 U 18000 U 450 U ;/G'.dl,830 1111
17000 U 430 UR 16000 U 18000 U 18000 U 450 U -960 -17COO U 430 UR 16000 U 18000 U 18000 U 450 UJ -280 I■
17000 U 430 UR 16000 U 18000 U 18000 U 450 U -840 -17000 U 430 UR 16000 U 18000 U 18000 U 450 U 730
17000 U 430 UR 16000 U 18000 U 18000 U 450 U -920 -17000 U 430 UR 16000 U 18000 U 18000 U 450 1JJ 730 1JJ
17000 U 430 UR 16000 UI 18000 UJ 18000 U 450 U 1600
17000 U 430 UR 16000 U 18000 U 18000 U 450 U .-120 JIii
17 u 430 UR 16000 U 18000 U 18000 U 450 UJ -320 I■
2500 J 430 UR 2000 I 6200 J 11000 J 450 U 430 U
17000U 430 UR 16000 UJ 18000 1JJ 18000 U 450 U 1200
17000 U 430 UR 16000 U 18000 U 18000 U 450 U 1600
4400 4200 8900 15300 9780
16000 411000 11000 25000 22000 30000 15000
'2) 1.4 UJ 28 I 25 j 29 J 0.99 UJ 0.53 UJ
JMIIJ:8 1111 -2:2 1111 1ZB2'4 11111 2.6 U iliRa2:0 lllii .. 2,7 --3~4 11111
310 1811l'W -310 1200 1400
_., .. -160 11111
042 U 0.68 U 0.28 U 0.50 U 0.51 U 055 U 0.48 U
3.9 J •0:51 i• 3.8 J 2.8J 3.S 1 0.08 Ul 0.08 UI
-6500 11111 lm\700 -!lllllll9600 11111 _,.,, 1111 -9100 Ill 720 U !-2700 -60 40 68 120 140 21 31
8.9 UJ 8.6 UJ 3.8 UJ 6.6 UJ 6.7 UJ 7.9 UJ _7,8 I■
380 J 64 I 340 I 260 j 310 J -10 I■ -24 I■
17000 24000 9700 17000 17000 20000 19000
180 J 84 j 170 J 210 J 15-0 j -13 I■ -12 I■
a.moo 11111 B3800 -111111200 --2soo --3000 -18111300 11111 illlll[4200 -180 220 160 220 240 240 180
61 -20 -33 310 350 11111118,2 --17 -ffllift2200 -11113300 -11!11111990 -!!li)fp2400 11!!1 IISllt2500 Ii!! 6'1ffl11100 1111 --1111
1.5 UJ 0.47 UJ UI 1.6 J 2.0 J 0.50 UJ 0.46 lJJ
3.5 U 3.2 1.8 U 2.2 U 2.0 U 0.74 U 0.66 U
~1200 1111: ;,ai760 -itiiiil200 lliii iiiiifJJOO ---1111 43 U 111m11110 1111
O.SO UJ 0.55 UJ 0.74 UJ 0.70 UJ 0.83 UJ 0.58 UJ 0.53 UJ
0.56 O.Cl7U 0.51 0.61 uo 0.07 U 0.07 U
41 ,. 27 36 36 46 45
860 310 1400 930 1100 5!;','.~"-,36 IC!! 100
HQ is calculated based on the maximum detected concentration as shown in bold.·
• = No screening value available
Detected contamlnant
Detected contaminant over screening value
-
USEPA
Regioa4
R,portNI Soll Freqarncy of
Con(t'ntntioll Frequency ScrHnlng Sci-teaing ~ttttion ovrr ..... of~t«tion \'alun HQ Scrttniag Values
430UR-JSOOOU 0/8
430UR-2SOJ 118 100 2.5 118
430UR-830 118
430UR -%0 118
430UR-280 118
4J0UR-840 118
430UR-730 118 100 7.3 118
4J0UR-920 118
430UR-l8000U Ml
O0UR-1600 118 100 16 118
4J0UR -120J l/8
O0UR -J20J 118
430U-l lOOOJ 518 100 110 518
430UR -1800 218 100 18 VB
430UR. 1600 118 100 16 118
430UR -9780 &8 1000 9,78 &8
I 1000-48000 ~· 50 960 ~· 0.53UJ -42 ~· 3.5 12 418
2.6U-3.8 7/8 10 038 0/8
85 -1400 818 165 8.49 5/8
0.28U-0.72U 0/8 LI
0.08UJ -4.6J "" 16 2.88 518
720U-9600 718
21 -140 ~· 0.4 350 ~8
3.8UJ-7.8J 1/8 20 0.39 0/8
IOJ-3801 8/8 40 9.5 &8
17000-24000 ~8 200 120 ~· 121 -2501 ~· 50 5 &8
1200-4200 ~· 160-290 ~· 100 2.9 818
17-350 ~· 30 11.67 518
990-4000 ~8
0.46UJ. 2.SJ 3/8 0.81 3.09 3/8
0.66U -J.5 VB 2 J.75 V8
43U-3100 7/8
0.53UJ. 0.83UJ 0/8 1
0.07U. 0.80 518 0.1 8 5/8
27-S6 ~· 2 28 ~· 36-1400 ~· 50 28 7/8
- - ---- -- - ----.. -Table 2-3
Ecological Screening of Contaminants Analyzed for In Sediments
Sigmon's Septic Tank Service Site
Statesville, Iredell Countv, North Carolina
1999 ESI Investigation
USEPA Frequency of
Region 4 Dettttlo11
Reported St-diment ~"
Coace111ratlon Freqaeacy ScrNnlng ScrHnlna Scrttni11g
SS-017-SL SS-013-SL SS-019-SD SS-020-SD SS-021-SD SS-022-SD SS-023-SD SS-024-SD Range of Detection Value, HQ Values
Rnnll Q Rnult Q Result Q Result IQ Re1olt I Q Result Q Result Q Re,ult Q
VOLATILES (ug/I<g)
I, I.I-TRICHLOROETHANE 13 UJ 12 lJJ 19 UJ 13 UJ 33 UJ 13 1JJ 17 lJl 13U 12UJ • 33UJ om
1,1,2,2-TETRACHLOROETHANE 13 lJJ 12 lJJ 19 lJJ 13 lJJ 33 lJJ 13 U3 17 U3 13 U 12UJ -JJUJ om
1,1,2-TR1CHLOR0-1,2,2-TRIFUJOROETHANE (FREON 113) 13 lJJ 12 lJJ 19 lJJ 13 UJ ll UJ 13 lJJ 17 lJJ 13 U 12UJ -33UJ om
I , 1,2-TRICHLOROETI-IANE 13 UJ 12 l!J 19 UJ 13 UJ ll UJ 13 UJ 17 UJ 13 U 12UJ • 33UJ om
1, J-DICHLOROETHANE I 3 UJ 12 lJJ 19 UJ J3 UJ 33 UJ 13 UJ 17 UJ 13U 12UJ • 33UJ om
1,1-DICHWROETHENE (1,1-DICHLOROETHYLENE) 13 UJ 12 lJJ 19 UJ lJ UJ ll UJ 13 UJ 17 lJl 13 U l2UJ -JJUJ om
1,2,4-TRICHLOROBENZESE 13 UJ 12 lJJ 19 UJ 13 lD ll UJ 13 UJ 17 lD 13 U 12W -JJUJ om
1,2-DIBROMO-3-CHLOROPROP A.l'llE (OBCP) ll UJ 12 l!J 19 lD 13 UJ 33 UJ 13 UJ 17 UJ 13 U \2l0. JJUJ OJ8
1,2-DIBROMOETHANE (EOB) ll UJ 12 UJ 19 UJ 13 UJ 33 UJ ll UJ 17 UJ 13 U 12UJ. JJUJ OJ8
1,2-DICHLOROBENZENE 13 lJJ 12 lJl 19 UJ 13 UJ 33 UJ 13 UJ 17 UJ 13 U 12UJ-33UJ 018
1,2-DICHLOROETHANE 13 lJJ 12 UJ 19 lD lllJJ 33 UJ 13 lJJ 17 lJJ ll U 12UJ • 33UJ 018
\,2•DICHLOROPROPA.'l'E 13 UJ 12 UJ 19 UJ ll UJ 33 UJ 13 UJ 17 UJ 13U 12UJ • 33UJ 11/8
1,3-DICHLOROBENZENE 13 UJ 12 lJJ 19 UJ 13 UJ 33 UJ 13 UJ 17 lJJ 13U 12UJ -33UJ OJ8
1,4-DICHLOROBENZENE 13 UJ 12 lJJ 19 UJ 1l UJ 33 UJ 13 UJ 17 UJ IJU 12UJ -33UJ om
ACETONE 13 UJ 12 UJ 19 UJ 13 UJ ]] UJ 13 UJ 17 UJ 13 U l2UJ • 33UJ om
BENZENE 13UJ 12 lD 19 lD 13 UJ ]] UJ 13 UJ 17 UJ 13U 12UJ • 33UJ om
BROMODICHWROMETHA..'l'E 13 UJ 12 lJl 19 1JJ 13 UJ ll UJ 1l UJ 17 UJ 13 U 12UJ -33UJ 1118
BROMOFORM ll UJ 12 UJ 19 UJ 13 lD ll UJ 1l UJ 17 UJ 13 U l2UJ • 33UJ 1118
BROMOMETHANE 13 1JJ 12 UJ 19 lJJ 13 UJ ]] UJ 13 UJ 17 UJ 13 U 12UJ • 33UJ 0/8
CARBON DISULFIDE 13 UJ 12 UJ 19 UJ 13 UJ 33 lJJ ll UJ 17 UJ 13 U 12UJ · 33UJ om
CARBON TETRACHLORIDE 13 UJ 12 lJJ 19 lD 13 lD ll UJ ll UJ 17 UJ 13 U 12UJ. JJUJ om
CHLOROBENZENE ll UJ 12 l!J 19 lJJ 13 lD ]] UJ 1 l lJJ 17 UJ ll U 12UJ • 33UJ OJ8
CHLO RO ETHANE 1l UR 12 UR 19 UR 13 UR 33 UR ll UR 17 UR 13 U 12UJ-33UJ OJ8
CHLOROFORM 13 UJ 12 UJ 19 UJ 13 UJ ]] UJ 13 UJ 17 UJ 13 U 12UJ -3JUJ om
CHLO RO METHANE 13 UJ 12 UJ 19 lD 13 lJJ 33 UJ 13 UJ I 7 UJ llU 12UJ • 33UJ 018
CIS-l,2•DICHLOROETHENE 13 UJ 12 UJ 19 lJJ ll UJ 33 UJ 13 UJ 17 UJ 1l u 12UJ -33UJ om
CIS-1,3-DICHLOROPROPENE 13 UJ 12 UJ 19 UJ 13 lD ll UJ 13 lJJ 17 UJ ll U 12UJ -33UJ 11/8
CYCLOHEXANE 13 UJ 12 UJ 19 UJ ll lJJ 33 UJ 13 UJ 17 UJ 13U 12UJ • 33UJ OJ8
DIBROMOCHLOROMETHANE 13 UJ 12 UJ 19 lJJ 13 VJ 33 UJ 13 UJ l7 UJ 13 U I 2UJ -33UJ OJ8
DICHLORODIFlUOROMETilANE 13 lD 12 lJl 19 UJ 13 UJ llUJ 13 UJ 17 UJ 13 U l2UJ · 33UJ om
ETHYL BENZENE 13 UJ 12 UJ 19 lD 1l 1J) ll UJ 13 UJ 17 UJ 13 U l2UJ • 33UJ 0/8
ISOPROPYLBENZENE 13 UJ 12 UJ 19 lD 13 lJl 33 UJ 13 UJ 17 UJ 13 U 12UJ · 33UJ OJ8
METHYL ACETATE 13 UJ 12 UJ 19 UJ 13 UJ llUJ 13 UJ 17 UJ 13U 12UJ · 33UJ 11/B
METHYL BUTYL KETONE 13 1JJ 12 UJ 19 UJ 13 1J) ]] UJ 13 UJ 17 UJ 13 U 12UJ • 33UJ 0/8
METHYL ETHYL KETONE 13 UJ 12 UJ 19 lJl 13 lJJ ]] UJ 1l lJJ 17 UJ 13 U 12UJ · 33UJ om
METHYL ISOBUfYL KETONE 13 UJ 12 lD 19 UJ 13 1JJ ll UJ 1l UJ 17 lJJ 13U 12UJ · JJUJ om
METHYL T·BLITYL ETHER (MTBE) 13 UJ 12 lJJ 19 UJ 13 UJ 33 lD ll UJ 17 UJ 13 U 12UJ -J3UJ 018
METHYLCYCWHEXANE 13 UJ 12 UJ 19 lJl 13 UJ 33 UJ ll UJ 17 UJ 13 U 12UJ · 33UJ 018
METHYLENE CHLORIDE 13 Ul 12 UJ 19 lJl 13 UJ ll UJ 1l UJ 17 UJ 13 U 12UJ. JJUJ om
SfYRENE ~~~ jl,: 12 UJ 19 UJ 13 UJ 33 lJJ ll UJ 17 UJ ll U 12UJ -33UJ Im
TETRACHLOROETHEN"E {TETRACHLOROETHYLENE) il UJ 12 lJJ 19 UJ 13 UJ 33 1J) 1 l lJJ 17 UJ 13U 12UJ -JJUJ 0/8
TOLUENE ll UJ 12 UJ 19 lJl 13 UJ 33 lJJ ll UJ 17 UJ 13 U 12UJ -33UJ 1118
TOT AL XYLENES 13 UJ 12 UJ 19 UJ 13 lJJ 33 UJ ll UJ 17 UJ 13 U 12UJ -J3UJ 11/8
TRANS• l ,2•DICHLOROETHENE 13 UJ 12 UJ 19 UJ 13 UJ 33 UJ 13 UJ 17 UJ 13 U \2UJ -3JUJ 11/8
----

-
TRA.'l"S-1,3-DICHLOROPROPENE
TRICHLOROETHENE (TRJCHLOROETHYLENE)
TRICHLOROFLUORO~ETHANE
VINYL CHLORIDE
EXTRACTABLES (u~kg)
(3-A..W/OR 4-)METHYLPHENOL
1,1-BIPHENYL
2,4,5-TRICHWROPHENOL
2,4,6-TRICHLOROPHENOL
2,4-DICHLOROPHENOL
2,4-DNETHYLPHENOL
2,4-DINITROPHENOL
2,4-DINITROTOLUENE
2,6-DINITROTOUJEXE
2-CHLORONAPHTHALENE
2-CHLOROPHENOL
2-METHYL-4,6-DINITROPHENOL
2-METHYLPHENOL
2-NITROANILINE
2-NITROPHENOL
3,3'-DICHLOROBENZIDINE
3-NITROANJLINE
4-BROMOPHENYL PHENYL ETHER
4-CHLOR0-3-METHYLPHENOL
4-CHLOROANILINE
4-CHLOROPHENYLPHENYLETHER
4-NITROANILINE
4-NITROPHENOL
ACETOPHENONE
ATRAZINE
BENZALDEHYDE
BE.~ZVLBUTYLPHTHALATE
BIS(2-CHL0ROETHOXY)METHANE
B15(2-CHLOROETHYL) ETHER
BIS(2-CHLOROISOPROPYL) ETHER
815(2-ETHYLHEXYL) PHTHALATE
CAPROLACT AM
CARBAZOLE
DIBENZORJRAN
DIETHYL PHTHALATE
D™ETHYL PHTHALATE
D1-N-BurYLPHIBALATE
DI-N-ocrYLPHTHALATE
HEXACHLOROBENZENE(HCB)
HEXACHLOROBUT ADIENE
-----

-
SS-017-SL
Result Q
13 UJ
13 UJ
13 UJ
13 UJ
450 U
450 U
1100 U
450 U
4S-O U
450 U
1100 U
450 U
450 U
450 U
450 U
1100 U
450 U
1100 U
450 U
450 U
1100 U
450 U
450 U
450 U
450 U
1100 U
1100 U
450 U
450 U
-~,·,:1e>:,~o i:li!
450 U
450 U
450 U
450 U
450 U
450 U
450 U
450 U
450 U
450 U
450 U
450 U
450 U
450 U
Table 2-3
Ecological Screening of Contaminants Anatyzed for In Sediments
Sigmon's Septic Tank Service Site
Statesville, Iredell County, North Carolina
1999 ES! Investigation
SS-018-SL SS-019-SD SS-028-SD SS-021-SD SS-022-SD SS-02J..SD SS-014-SD
Result Q Result Q Result Q Rt1ul1 Q ffe3ul1 Q Result Q Result Q
12 UJ 19 UJ 13 UJ 33 UJ 13 lD 17 UJ 13 U
12 t!J 19 UJ 13 UJ 33 UJ 13 Ul 17 UJ 13U
12 UJ 19 UJ 13 UJ 33 UJ 13 UJ 17 Ul 13U
12 UJ 19 UJ 13 UJ 33 U3 13UJ 17 lD 13 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U !JOO U 430 U 570 U 410 U
1100 U 1600 U liOO U 2700 U 1100 U 1400 U 1000 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U -BOU 570 U 410 U
1100 U 1600 U IIOO U 2700 U 1100 UJ 1400 U 1000 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
1100 U 1600 U 1100 U 2700 U 1100 U 1400 U 1000 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
1100 U 1600 U IIOO U 2700 U 1100 UJ 1400 U 1000 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 UJ
1100 U 1600 U liOO U 2700 U 1100 U 1400 U 1000 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1!00 U 430 U 570 U 410 U
l\00 U 1600 U !JOO U 2700 U 1100 U 1400 U 1000 U
1100 U 1600 U IIOO U 2700 U 1100 U 1400 U 1000 U
430 U 650 U 450 Li IIOO U 430 U 570 U 410 U
430 U 650 U 450 U 1!00 U 430 U 570 U 410 U
~?t'J.15i J~ 650 U 450 U 1100 U 430 U3 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 Ul
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U IIOO U 430 U S70 U 410 UJ
430 U 650 U 450 U 1100 U 430 UJ 570 U 410 UJ
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
Ui;:i'iO ,. :;,.;;i\'!i9. Jfr~ 450 U 1100 U 430 U 570 U 410 U
~ )Ji; 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
.'·~1~'460 ~-~0'· 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1!00 U 430 UJ 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U \JOO U 430 U 570 U 410 U
=-lilili --
USEPA Frequency of
Region 4 Dettttloo
Reported Sediment ~"
Coocentntion Freqatncy Scrrenlog Scr«nlng ScrHning
Range of Detection Vah1e1 HQ Valutt
12UJ -JJUJ 0/8
12UJ -JJUJ 0/B
12UJ • JJUJ 0/8
12UJ -33UJ 0ffl
410U-11000 0/8
4100-JIOOU 0/8
IOOOU-2700U 0ffl
4J0U-l\OOU 0ffl
4\0U-llOOU 0/8
410U-IIOOU 0/B
IOOOU-2700U 0ffl
4l0U-llOOU M
4l0U-JlOOU 0/8
410U-J\OOU 018
4\0U-IIOOU 0ffl
IOOOU-2700U 0/8
410U-JIOOU 0/S
JOOOU-2700U 0/8
410U-\IOOU 0ffl
410U-I\OOU M
lOOOU -2700U 0/8
4\0U-IIOOU 0/8
410U-IIOOU 0/8
410U-IIOOU 0/S
4JOU-lJOOU 018
lOOOU-2700U 0ffl
IOOOU -2700U 0/8
4JOU-IIOOU 0/B
410U-llOOU M
410U-440J 2/B
4IOUJ-I\OOU 0/8
410UJ-I\OOU 0/8
410UJ-1 IOOU 0ffl
4l0UJ -

I

IOOU 018
410UJ -

1

IOOU OJ! 182
410UJ -

1

IOOU 0/8
410U-270J 2/B
410U -681 lffl
410U-IIOOU 0/S
410U -460 lffl
410U-I JOOU 018
4!0U. I JOOU 0/8
4IOU-1 lOOU 0/8
4IOU-1 JOOU 0ffl
---

-

-
-

-
-

-
-

-
!Ill
SS-017-SL
Rt1olt Q
HEXACHLOROCYCLOPENT ADlENE (HCCP) 450 UJ
HEXACl-llOROETHANE 450 U
ISOPHORONE 450 U
NITRO BENZENE 450 U
N-NITROSODI-N-PROPYU.MINE 450 U
N-~TIROSODIPHE1','YLAMINE/DlPHEr-.'YLAMINE 450 U
PENTACHLOROPHENOL 1100 U
PHENOL 450 U
POLYCYCLIC AROMATIC HYDROCARBONS (PAlb) (UG/KG)
2-METHYLNAPHTHALENE 450 U
AC~APHTHENE 450 U
AC8'APITTHYLENE 450 U
ANTHRACENE 450 U
BENZO(A)A.'ITHRACENE 450 U
BENZO(B)FLUORANTHENE 450 U
BENZO(GHl)PERYLENE 450 UJ
BENZO(K)FLUORANTHENE 450 U
BENZO.A·PYRENE 450 U
CHRYSENE 450 U
DIBENZO(A.H)ANTHRACENE 450 UJ
R,UORANTHENE 450 U
FLUORENE 450 U
INDENO (1,2,3-CD) PYRENE 450 UJ
NAPHTHALE}.'E 450 U
PHENANTHRENE 450 U
PYRENE 450 U
TOT AL PAHs (SUM OP DETECTIONS ABOVE)
METALS (mg/kg)
ALUMINUM .,0000 • ANTL.\.10NY 0.99 UJ
ARSENIC .rm • BARIUM _,, -BERYWUM 0.55 U
CADMIUM 0.08 UJ
CAl.CIUM 720 U
CHROMRJM IIIIJii1 -COBALT 7.9 UJ
COPPER ~ ill
IRON .,0000 -LEAD ~ ill
MAGNESRJM ~ -MAN'GANESE lllll2To -1','ICKEL ..mi -POTASSIUM laiToo -
Table 2-3
Ecological Screening of Contaminants Anatyzed for In Sediments
Slgmon's Septic Tank Service Site
Statesville, Iredell Countv, North Carolina
1999 ESl lnvestlgatlon
SS-OIS-SL SS-019-SD ss-020-so ss.021-so SS-022-SD SS.023-SD SS-024-SD
Rtsnlt Q Rnult Q Result Q Result Q Result Q Re,ult Q Rnult Q
430 UJ 650 UJ 450 UJ 1100 UJ 430 UJ 570 UJ 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 4S0 U IIOO U 430 U 570 U 410 U
430 U 650 U 450 U 1!00 U 430 U 570 U 410 U
1100 U 1600 U 1100 U 2700 U 1100 U 1400 U 1000 U
430 U 650 U 450 U 1100 U 430 UJ 570 U 410 U
430 U 650 U 450 U l!OO U 430 U 570 U 410 U
130 J 650 U 450 U 1100 U 430 U 570 U 410 U
430 U 650 U 450 U liOO U 430 U 570 U 410 U
250 J 82 J 450 U IJOO U 430 U 570 U 410 U
830 430 J 450 U 1100 U 430 U 570 U 410 U ..,., -~ • 450 U 1100 U 430 U 570 U 4!0 U
lll28o ill lllllllll[J"iro ill 4l0 UJ IIOO U 430 U 570 UJ 410 U
~ -IIIIEso ill 450 U IIOO U 430 U 570 U 410 U
730 450 J 450 U lJOO U 430 U 570 U 410 U
920 510 J 450 U liOO U 430 U 570 U 410 U
730 UJ 88 J 450 UJ 1100 U 430 U 570 UJ 410 U
1600 810 450 U 1100 U 430 U 570 U 410 U
120 J 650 U 450 U l!OO U 430 U 570 U 410 U
IIIIIIJj"io ill lllllllliTci ill 450 UJ IIOO U 430 U "' UJ 410 U
-430 U 650 U 450 U 1100 U 430 U 570 U 410 U
1200 450 J 450 U l\00 U 430 U 570 U 410 U
1600 810 450 U liOO U 430 UJ 570 U 410 UJ
9780 5150
■15000 -R4oooo • ■19000 • 8nooo -1111,,oo • aToo • IIIIIKOO •
0.53 UJ 2.0 UJ 0,89 UJ 1.6 l!J 0.63 UJ 0.95 UJ 0.58 UJ
1111'3'; -8.0 ~ -1111111m: -0.66 U I.I U 0.61 U
~ -llllliTo -..,. -..., --. -_... --.m •
0.48 U 0,65 U 0,27 U 0.76 U 0.27 U 0.50 U 0.08 U
0.08 UJ 0.12 UJ 0.09 UJ 0.23 UJ 0.09 UJ 0.14 UJ 0.08 UJ
..-noo -~ -770 U 2000 U 780 U 1200 U 720 U
~ -.-;. -~ -~ -.-m • ~ -~ • llllllam ill 7.9 UJ 2.5 UJ 6.8 UJ 2.6 UJ 5.0 UJ 0,89 UJ
24 J 37 J 5.9 UJ 11 UJ 4.2 UJ 8.5 UJ 1.8 UJ
■19000 -■rnioo -■16000 -■21000 --5200 -■12000 -•noo • ~ ill ■-ii' ill -.'ii 1■ .iii ill ~ ill ~ ill ~ ill
~ -.5,HlO -~ --2600 -~ -IEso -lllllliso • llllllliTo -~ --■;. -ISiTo -IIIEw -.-m -~ •
17 21 ~ -11111111m -.s'i!'i. -~ -Mo.92 • ~ -Ssioo -aiToo -a2200 -■-7so -1115W • IIIE40 •
-
USEPA Frequency of
Region 4 Detection
Repor1W SN!Jmenl m,
Conuotratlon Frrquency Scrttniog Scrttniog Scl'ffnlog
lhnge ofDettttlon ValuH HQ Valuu
410U-IIOOU 0/8
4100· IIOOU 0/8
4JOU-IJOOU 0/8
410U-IIOOU 0/8
410U-\IOOU 018
410U· 1100U 0/8
IOOOU-2700U 0/8
410U-IIOOU 0/8
4JOU-l!OOU 018 20.2,.........,
410U -130J 1/8 6,71....-19.37 1/8
-410U-l\OOU 0/8 _ .5,8r-
410U-250J 2/8 40.9 ..... 5.33 2/8
4l0U -830 218 _74.8-IJ.I 218
410U-960 218
4100. 280] 218
4IOU-840 2/8
410U-730 218 8 .... 8.22 2/8
4\0U-920 218 ~ 8.52 2/8
410U • 88J 118 .o.22--14,15 118
410U -1600 218 ,...1-1-3-14.16 2/8
410U-120J 118 21.2 5.66 1/8
410U • 320J 2/8
4100-llOOU 018 .lo'#"
4IOU-1200 218 .....--13.84 2/8
4IOUJ-1600 218 ~ 10.46 218
410U-9780 218 -----5.81 218
1400-40000 8/8
0. 53UJ • 2. OUJ 0/8 -:c
0.61U -8.0 518 7,..2.r: LI 118
10-210 8/8
0,08U • 0. 76U 0/8
O.OSUJ • 0.23UJ 0/8 ~
720U -2700 218
3.5 -46 818 52~ 0.88 0/8
0.89UJ • 7.8J 118
1.8UJ -37J )/8 ➔81'"": !.98 218
3200-37000 818
1.61 -211 818 _30:-2 ..... 0.7 0/8
180 • 5400 818
44-380 818
0.92-21 818 ..15:9-1.32 218
240-5100 818
---
SELENIUM
SILVER
SODlt.N
THAll.RN
TOTAL MERCURY
VANADIUM
ZINC
NOTES:
a " Data Qua!Jfier.
U ., Undetected.
J " Estimated Value.
R " Rejected Data.
NA : Not analyzed.
-

-
-

-
---

-
SS-017-SL
Result Q
0.50 UJ
0.74 U
43 U
0.58 UJ
0.07 U
lilll!.46 111!!1
l!lilllJj6 Ill
Table 2-3
Ecological Screening of Contaminants Analyzed for In Sediments
Slgmon's Septic Tank Service Site
Statesville, Iredell County, North Carolina
1999 ESI Investigation
SS-0111--SL SS-019-SD SS-020-SD SS-021-SD SS-022-SD SS-02J..SO SS-014-SD
Result Q Re.ult Q Rtsnlt Q Rr■oll Q Result Q Re1nlt Q Result Q
0.46 UJ 0.73 UJ 0.54 UJ 1.4 UJ 0.54 UJ 0.82 UJ 0.50 UJ
0.66 U 1.5 u 0.65 U 0.61 U 0.24 U 0.50 U 0.22 U
iM110 WI ~9S !Iii: ~-mi 120 U 47 U 70 U 43 U
0.53 UJ 0.85 UJ 0.62 La J.6 UJ 0,63 UJ 0.95 UJ 0.58 La
0.07 U 0.10 U 0,07 U 0.17 U 0.08 U 0.11 U 0.07 U
~ el fllifss !ill illlll,i li£i Qils;i' a JOU i).~ 11\h 8.8 U
lllllioo !Ill 150 illiE7. llll l!l1IIIIITT u ~ij ~ llffllo Iii ~5:6 i;,,
HQ ls calculated based on the maximum detected com:entration as shown in bold.
-" No screening value available.
Detected contaminant
Detected contaminant over screening value
----
USEPA Frequency of
Rq:loa 4 Detection
ReportNi Srdlmeat ~"
Conctntration Freqnenc)' ScrHnlng Screening Screening
Range of Detection Val11e1 HQ Valae1
0.46UJ-1.4UJ 0/8
0.22U-l.5U 011! -a.m
43U-IJO 311!
O.SJUJ • l.6UJ 0/1!
0.07U • O. I 7U 011! ,O,H•
8.SU-85 611!
13 • 150 811! 124 1.21 111!
-----
Constituent
VOLATILES (UG/L)
I, I, I-TRICHLOROETHANE
1.1,2,2-TETRACHLOROETHANE
1, 1,2-TRICHLOROETHANE
I, 1-DICHLOROETHANE
I, 1-DICHLOROETHENE ( 1.1-DJCHLOROETHYLENE)
1,2,4-TRICHLOROBENZENE
1,2-DIBROMO-3-CHLOROPROPANE (DBCP)
1,2-DIBROMOETHANE (EDB)
1.2-DICHLOROBENZENE
t,2-DICHLOROETHANE
1,2-DICHLOROPROP ANE
1,3-DICHLOROBENZENE
1,4-DICHLOROBENZENE
ACETONE
BENZENE
BROMODICHLOROMETHANE
BROMOFORM
BROMOMETHANE
CARBON DISULFIDE
CARBON TETRACHLORIDE
CHLOROBENZENE
CHLOROETHANE
CHLOROFORM
CHLOROMETHANE
CIS-1,2-DICHLOROETHENE
CIS-1.3•DICHLOROPROPENE
DIBROMOCHLOROMETHANE
ETHYL BENZENE
METHYL BUTYL KETONE
METHYL ETHYL KETONE
METHYL ISOBUTYL KETONE
METHYLENE CHLORIDE
STYRENE
TETRACHLOROETHENE<TETRACHLOROETHYLENE)
-

-

-
-

-

-
Table 2-4
Ecological Screening of Contaminants Analyzed for In Surface Water
Sigmon's Septic Tank Service Site
Statesville, Iredell County, North Carolina
1999 ESI lnvestlRations
Reported
Concentration
SS-019-SW SS-020-SW SS-021-SW SS-022-SW SS-023-SW SS-024-SW Range
Result I Q Result I Q Result I Q Result Q Result I Q Result I Q
I u I u I u I u I u I u IU -IU
I u I u I u I u I u I u IU-IU
I u I u I u I u I u I u IU-JU
I u I u I u I u I u I u lU -IU
I u I u I u I u I u I u IU -IU
I u I u I u I u I u I u rn -tu
I UR I UR I UR I UR I UR I UR IUR-IUR
I u I u I u I u I u I u IU-lU
I u I u I u I u I u I u !U-IU
I u I u I u I u I u I u IU-JU
I u I u I u I u I u I u IU -tu
I u I u I u I u I u I u IU -IU
I u I u I u I u I u I u lU. w
111m !Iii! 5 UR 1111118 !fiJ! 5 UR 5 UR 5 UR 5UR -13J
I u I u I u I u I u I u IV· IU
I u I u I u I u I u I u !U. \U
I u I u I u I u I u I u IU-IU
I u I u I u I u I u I u IV. IU
I u I u I u I u I u I u IV· IV
I u I u I u I u I u I u IU-IU
I u I u I u I u I u I u IV. JU
I u I u I u I u I u I u !U-IU
I u I u I u I u I u I u IV· lU
I u I u I u I u I u I u IV· IV
1 u I u I u I u I u I u JU· IV
I u I u I u I u I u I u 1U -IV
I u I u I u I u I u I u IU-IU
I u I u I u I u I u I u IV -IV
5 UR 5 UR 5 UR 5 UR 5 UR 5 UR 5UR-5UR
5 UR 5 UR 5 UR 5 UR 5 UR 5 UR 5UR-5UR
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UR. 5UR
2 u 2 u 2 u 2 u 2 u 2 u 2U -2U
I u I u I u I u I u I u IV -IU
I u I u 1 u I u I u I u 1U. JU
-lllil --
USEPA
Region 4 Frequency of
Surface Detection
Frequency Water ovtr
of Scretning Screening Streening
Detection Values HQ Values
0/6 528
016 240
016 940
0/6 -
016 303
016 44.9
016
016 -
0/6 15.8
016 2000
0/6 525
016 50,2
016 11.2
216 -
016 53
016
016 293
016
0/6 -
016 352
016 195
0/6
016 289
016 5500
0/6 -
016 24.4
0/6 -
016 453
016
0/6 -
016 -
0/6 1930
016 -
016 84
--

-
--
Constituent
TOLUENE
TOT AL XYLENES
TRANS-1,2-DICHLOROETHENE
TRANS-1,3-DICHLOROPROPENE
TRICHLOROETI-IENE (TRJCHLOROETHYLENE)
VINYL CHLORIDE
EXTRACTABLES (UG/L)
(3-AND/OR 4-)METHYLPHENOL
2,4,5-TRICHLOROPHENOL
2,4,6-TRICI-Il.OROPHENOL
2.4-DICHLOROPHENOL
2,4-DIMIITHYLPHENOL
2 4-DINITROPHENOL
2,4-DINITROTOLUENE
2,6-DINITROTOLUENE
2-CHLORONAPHTHALENE
2-CHLOROPHENOL
2-METHYL-4,6-DINITROPHENOL
2-MFfHYLPHENOL
2-NITROANU..INE
2-NITROPHENOL
3,3'-DICHLOROBENZIDINE
3-NITROANILINE
4-BROMOPHENTI.. PHENYL ETHER
4-CHLORO-3-METHYLPHENOL
4-CHLOROANILINE
4-CHLOROPHENYL PHENYL ETHER
4-NITROANILINE
4-NITROPHENOL
BENZYLBUTYLPHTHALATE
81S(2-CHLOROETHOXY)METHANE
81S(2-CHLOROETHYL) ETHER
BIS(2-CHLOROISOPROPYL) ETHER
BIS(2-ETHYLHEXYL) PHTHALATE
DIBENZOFURAN
--

-
--

-
Table 2-4
Ecological Screening of Contaminants Analyzed for In Surface Water
Slgmon's Septic Tank Service Site . • Statesville Iredell County North Carolina
1999 ESI lnvesti11atlons
Reported.
Concentration
S!Hl19-SW SS-020-SW S!HJ21-SW SS-022-SW SS-023-SW SS--024-SW Range
Result Q Result Q Result Q Result Q Result Q Result Q
1 u 1 u 1 u 1 u t~~o:4 f}ji<; 1 u 1U -0.4J
1 u I u 1 u 1 u 1 u 1 u tu -JU
I u 1 u 1 u 1 u 1 u 1 u JU. lU
1 UJ 1 UJ 1 UJ 1 UJ 1 UJ 1 UJ IUJ -IUJ
1 u 1 u 1 u 1 u 1 u 1 u IU-JU
1 u 1 u 1 u 1 u 1 u 1 u IU-IU
5 UJ ' UJ 5 UJ ' UJ 5 UJ 1 u SUJ -SUJ
20 UJ 20 UJ 20 UJ 20 UJ 20 UJ NA 20UJ -20UJ
5 UJ 5 UJ 5 UJ 5 UJ ' UJ 20 UJ 5UJ -5UJ
5 UJ 5 UJ 5 VJ 5 UJ ' UJ 5 UJ 5UJ -5UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ SUJ -SUJ
20 UJ 20 UJ 20 UJ 20 UJ 20 UJ 5 UJ 20UJ -20UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 20 UJ SUJ -SUJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ • SUJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ -5UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ -SUJ
20 UJ 20 UJ 20 UJ 20 UJ 20 UJ 5 UJ 20UJ -20UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ -5UJ
20 UJ 20 UJ 20 UJ 20 UJ 20 UJ 5 UJ 20UJ -20UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 20 UJ SUJ • 5UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ. 5UJ
20 UJ 20 UJ 20 UJ 20 UJ 20 UJ 5 UJ 20UJ -20UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 20 UJ 5UJ -20UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ SVJ -SUJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ -5UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ SUJ • 5UJ
20 UJ 20 UJ 20 UJ 20 UJ 20 UJ 5 UJ 20UJ -20UJ
20 UJ 20 UJ 20 UJ 20 UJ 20 UJ 20 UJ 20UJ -20UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ -SUJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ -SUJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5UJ -SUJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ SUJ -SUJ
5 UJ 5 UJ 5 VJ 5 UJ 5 UJ 5 UJ SUJ -SUJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ 5 UJ SUJ -SUJ
--
USEPA
Region 4 Frequency of
Surface Detection
Frequency Water over
of Serening Screening Screening
Detection Values HQ Values
1/6 175 0.002 0/6
0/6 .
0/6 1350
0/6 24.4
0/6
0/6
0/6 .
0/6
016 3.2
0/6 36.5
0/6 21.2
0/6 .6.2
0/6 310
0/6 .
0/6 .
0/6 43.8
016 2.3
0/6
0/6 .
0/6 3500
0/6 ..
0/6
0/6 12.2
0/6 .
0/6 .
0/6 .
0/6
0/6 82.8
0/6 22
0/6
0/6 2380
0/6 .
0/6 0.3
0/6
-- ------ ---Table 2-4
Ecological Screening of Contaminants Analyzed for In Surface Water
Constituent ~19-SW
Result Q
DIETHYL PHTHALATE 5 UJ
DIMETHYL PHTHALATE 5 Ul
DI-N-BUTYLPHTHALATE 5 UJ
01-N-OCTYLPHTHALATE 5 UJ
HEXACHLOROBENZENE(HCB) 5 Ul
HEXACHLOROBUTADIENE 5 UJ
HEXACHLOROCYCLOPENT ADIENE (HCCP) 5 Ul
HEXACHLOROETHANE 5 UJ
lSOPHORONE 5 UJ
NITROBENZENE 5 Ul
N-NITROSODl-N-PROPYLAMlNE 5 UJ
N-NITROSODIPHENYLAMINFJDIPHENYLAMINE 5 UJ
PENTACHLOROPHENOL 20 Ul
PHENOL 5 UJ
POLYCYCLIC AROMATIC HYDROCARBONS (PAEh) (UG/L)
2-METHYLNAPHTHALENE 5 UJ
ACENAPHTHENE 5 UJ
ACENAPHTHYLENE 5 Ul
ANTHRACENE 5 UJ
BENZO(A)ANTHRACENE 5 UJ
BENZO<B)FLUORANTHENE 5 Ul
BENZO(GHDPERYLENE 5 UJ
BENZO(K)FLUORANTHENE 5 Ul
BENZO-A-PYRENE 5 UJ
CHRYSENE ' UJ
DIBENZO(A,H)ANTHRACENE 5 UJ
FLUORANTHENE 5 Ul
FLUORENE 5 UJ
INDENO (1,2.3-CD) PYRENE 5 UJ
NAPHTHALENE 5 UJ
PHENANTHRENE 5 UJ
PYRENE 5 UJ
/METALS (lJG/L) /
ALUMINUM / I 520 ul
ANTIMONY _./" ' I 2.1 UJ I
• •
Sigmon's Septic Tank Service Site
Statesville Iredell County North Carolina
1999 ESI lnvestlRatlons
S~20-SW SS-021-SW ~22-SW ~23-SW ~24-SW
Result Q Result Q Result Q Result Q Result Q
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 Ul 5 Ul 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 Ul 5 Ul 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 Ul 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 Ul 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ ' UJ 5 UJ
5 Ul 5 Ul 5 Ul 5 UJ 5 Ul
' UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
20 Ul 20 UJ 20 Ul 20 UJ 5 Ul
5 UJ 5 UJ 5 UJ 5 Ul 5 UJ
5 UJ 5 UJ 5 Ul 5 UJ 20 UJ
5 UJ 5 UJ 5 UJ 5 UJ 20 UJ
5 Ul 5 UJ 5 UJ 5 Ul 5 Ul
5 UJ 5 Ul 5 Ul 5 UJ NA
5 UJ 5 UJ 5 UJ 5 UJ NA
5 UJ 5 Ul 5 UJ 5 Ul 5 Ul
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ NA
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 Ul 5 UJ 5 Ul 5 Ul 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
5 UJ 5 UJ 5 Ul 5 Ul 5 UJ
5 UJ 5 UJ ' UJ 5 UJ 20 UJ
5 UJ 5 UJ 5 UJ 5 UJ 5 UJ
1900 I 420 ul 891 U 1401 UI 861 u I
2.1 UJ I 2.1 UJ I 2.1' UJ 2.d ui I 2.11 ml
Reported
Concentration
Range
5UJ -5UJ
5UJ • 5UJ
5UJ -5UJ
5UJ • 5UJ
5UJ • 5UJ
5UJ -5UJ
5UJ -5UJ
SUJ -5UJ
5UJ -5UJ
5UJ • 5UJ
5UJ -5UJ
5UJ • 5UJ
20UJ • 20UJ
5UJ • 5UJ
5UJ -20UJ
5UJ -20UJ
5UJ -SUJ
5UJ -5UJ
5UJ -5UJ
5UJ -5UJ
5UJ -5UJ
5UJ -5UJ
5UJ • 5UJ
5UJ -5UJ
5UJ • 5UJ
5UJ • 5UJ
5UJ -5UJ
5UJ • 5UJ
5UJ -5UJ
5UJ • 20J
5UJ -5UJ
86U -1900 1
2.lUJ-2.lUl I
---
USEPA
Region 4 Frequency of
Surface Detection
Frequrncy Water over
of Screening Screening Screening
Detection Values HQ Values
016 521
016 330
0/6 9.4
016
0/6
016 0.93
016 0,07
0/6 9.8
016 1170
016 270
016 -
016 58.5
016 13
016 256
016
016 17
0/6
015
015 -
016 -
016 -
016 -
0/6
015
016
0/6 39.8
016
0/6
016 62
016
0/6 -
116 I __..,_..... I 21.84 116
016 I _160-.... I
'--
-

-
--
ARSENIC
BARIUM
BERYLLIUM
CADMIUM
CALCIUM
CHROMIUM
COBALT
COPPER
IRON
LEAD
MAGNESIUM
MANGANESE
NICKEL
POTASSIUM
SELENIUM
SILVER
SODIUM
THALLIUM
TOTAL MERCURY
VANADIUM
ZINC
NOTES,
Q = Data Qualifier.
U = Undetected.
J = Estimated Value.
R = Rejected Data
NA = Not analyzed.
Constituent
------

-
-Table 2-4
Ecological Screening of Contaminants Analyzed for In Surface Water
Slgmon's Septic Tank Service Site
' ' Statesville Iredell County North Carolina
1999 ESI lnvest1!1atlons
Reported
Concentration
SS-019-SW SS-020-SW SS-021-SW SS-022-SW SS-023-SW SS-024-SW Range
Result Q Result Q Result Q Result Q Rtsult Q Result Q
-.rs D .-m n 2.2 UJ 2.2 UJ 2.2 UJ ~ fil 2.2UJ -l8J
.-;To --.;To -3.6 u _,-;; -~ -~ -3.6U -210
0.10 u 0.10 u 0.10 u 0.10 u 0.10 u 0.10 u 0. IOU -0. lOU
1.2 0.30 u 0.30 u 0.30 u 1.0 0.30 u 0.3U -1.2
-8700 --6300 -2600 u ~ -~ -a;;oo -2600U -8700
1.0 u I., u 0.30 u 0.40 u 0.30 u 0.40 u O.JU -t. 7lJ ...,. --.rs -0.60 u 0.60 u 0.60 u 0.60 u 0.6U -4.8
9.5 UJ 10 UJ I.I UJ 1.0 UJ 6.7 UJ 2.5 UJ t.OUJ -!OUJ
7000 3400 360 u 220 u IIIK,;ili -380 u 220V-7000
~ -,., I.I u I.I u I.I u I.I u I.IV -4.1
W2100 -W2000 -~ -~ -Mnoo -~ -1200 -2700
i.iToo -lllll7i7Ci -~ -Ian -IIIIITii -_, -11 • 1300
...-r -lllffli' -1.3 u 1.3 u 1.3 u 1.3 u UV -ll
■20000 D ■16000 n amo D aooo fil ■F3oo Iii ~ fil 1600) -20,000J
1.8 UJ 1.8 UJ 1.8 UJ 1.8 UJ 1.8 UJ 1.8 UJ l.8UJ -1.8UJ
0.60 u 0.60 u 0.40 u 0.40 u 0.40 u 0.40 u 0.4U -0.6U
... 00 -~ -160 u laiio1i -~ --4200 -!60U. 4900
2.1 u 2.1 u 2.2 u 2.2 u 2.1 u 2.1 u 2. IU · 2.2U
0.10 UJ 0.10 UJ 0.10 UJ 0.10 UJ 0. IO UJ 0.10 UJ 0.IUJ-0.IUJ
1.6 u 7.8 u 1.3 u 0.60 u 1.0 u 0.80 u 0.6U · 7.8U
220 85 13 u 13 u 13 u 13 u 13U -220
HQ is calculated based on the maximum detected concentration as shown in bold.
• = No screening value available.
Detected contaminant
Detected contaminant over screening value
.. aa -
USEPA
Region 4 Frequency of
Surface Detection
Frequucy Water over
of Screening Scrrening Screening
Detection Values HQ Values
3/6 191V' 0.09 0/6
5/6
0/6 0:-53~
2/6 0.66-1.82 2/6
5/6
0/6 ,J.l-
2/6 -
0!6 M,-
3/6 woo-7 2/6
2/6 .t,32---3.11 1/6
6/6 -
6/6
216 8-1:-'li-0.13 0/6
6/6 -
0/6 5
0/6 ""'~
5/6
0/6 _,_
0/6 _o.on-
0/6
2/6 58,91----3.73 216
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
2,1.5 Contaminant Fate and Transport
Based on a review of historical information available for the site, the primary potential causes of
contamination include the direct contamination of surface soils, groundwater, surface water, and
sediment by septic tank pumping and waste disposal operations on the site. The detection of
surface soil, sediment, surface water, and groundwater contamination indicates that contaminants
related to these and other activities may have been released to the surface during the site's
operational history. Given the known site characteristics, there are two physical means by which
contaminants can move from the site:
• Movement of contaminants in surface water runoff (dissolved or adsorbed to soil particles)
from the potential source areas downgradient into the ponds, streams, and drainage ditch.
• Movement of buried contamination with rainfall through subsurface soils into groundwater
(dissolved or as free product) and into the ponds, streams, and drainage ditch downgradient
from the potential source areas.
The degree of contaminant transport is affected by the soil pH, volatility, water solubility, and
organic carbon partitioning coefficient (Ko,) of each contaminant. These properties relate to a
chemical's ability to be dissolved in solution, become attached to sediment/soil particles, or
move with groundwater (Howard, 1989). Metals are generally more mobile in soils with a low
pH (EPA, 2000). Chemicals with a high volatility tend to quickly move into the air once
exposed to the surface. Chemicals with a high water solubility may dissolve readily in water and
move freely in surface and groundwater. Chemicals with a high K,, value (greater than 100)
tend to adsorb to the organic carbon in rich soils and will tend to resist groundwater transport
(Howard, 1989). These .chemicals will also tend to be adsorbed and carried on suspended
particles in surface water.
Biological transport may occur through uptake, bioaccumulation, and food-chain transfer. The
most significant properties that affect the biological movement of a chemical through the
environment are its water solubility and octanol-water partitioning coefficient (Kiw), In
biological transport, these factors are often expressed as a bioaccumulation factor (BAF) or a
bioconcentration factor (BCF). Chemicals that have a high water solubility will tend to remain
in solution and pass into the organism with water. In plants, soluble chemicals can readily pass
2-25 Draft
Sigmon's Septic Tank Site October I 8, 2001
Screening-Leve\ Ecological Risk Assessment
into the roots or stem and remain in the plant unless another process moves the chemical out. In
animals, soluble chemicals tend to remain in solution and are excreted without much effect.
Chemicals with a high Kow value tend to be lipophilic or "fat-loving" and become absorbed in
lipid tissue in plants and animals. These are chemicals that may tend to bioconcentrate in
organisms. Chemicals with BCF values greater than 100, BAF values greater than 1, and log
Kow values greater than 4 are considered to have the potential for movement through the food
chain (Howard, 1989).
These factors are considered in determining how each of the chemicals detected at the site may
move through the environment and how components of the ecosystem may become exposed.
2.1.5.1 Volatile Organic Compounds. The fate and transport mechanisms for most VOCs are
generally similar. Volatilization of these chemicals from soils has been demonstrated to be the most
significant removal process. The detected VOCs have low Koc values which suggests that they do
not readily bind to organic material in soil. In soils with a low organic material content, these VOCs
have been shown to readily move into groundwater and migrate both vertically and horizontally.
Terrestrial invertebrates do not readily assimilate these VOCs from soils and higher organisms
metabolize these compounds without bioaccumulation (A TSDR, 1993). As a result of these
properties, biological transfer of these chemicals is not significant in terrestrial environments.
The fate and transport mechanisms for VOCs in surface water are similar. Volatilization of these
chemicals from the water column has been demonstrated to be the most significant removal process.
The detected VOCs have very low Koc values which suggest that they do not readily bind to
suspended organic material in the water column. Aquatic invertebrates do not readily assimilate
these VOCs from the water and the small amount that may be ingested is metabolized by most
organisms (ATSDR, 1993). As a result of these properties, biological transfer of these chemicals is
not significant in aquatic environments.
2.1.5.2 Semivolatile Organic Compounds. Within the group of chemicals identified as
SVOCs, the fate and transport mechanisms are similar. Volatilization of these chemicals from soils
has been demonstrated to be . substantial and may account for over 20 percent of the loss of
contaminant from surface soils. SVOCs have moderately high Koc values ranging from 103 to 104
indicating that they tend to adsorb to organic material in soil. In soils with a low organic material
content, these SVOCs have been shown to move into groundwater and migrate both laterally and
2-26 Draft
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
horizontally. Soil invertebrates may readily assimilate these SVOCs from soil; however, most
vertebrates can effectively metabolize and eliminate these compounds (A TSDR, 1993). As a result
of these processes, biological transfer of these chemicals is not significant in terrestrial
environments.
In surface water, the fate and transport mechanisms are similar. SVOCs have moderately high Koc
values ranging from 103 to 104 indicating that they may tend to adsorb to suspended organic
material in the water column. Benthic invertebrates may readily assimilate these SVOCs from
sediment; however, most vertebrates can effectively metabolize and eliminate these compounds
(A TSDR, 1993). As a result of these processes, biological transfer of these chemicals is not
significantin aquatic environments.
2.1.5.3 lnorganics. The fate and transport properties of the detected inorganic contaminants
(metals) are highly variable. One metal, mercury, may be slightly volatile at normal atmospheric
conditions, although this is usually insignificant, while all other metals are non-volatile. Metal
adsorption to soils and sediments is very complex and is related to physical and chemical properties
of soils or sediments themselves. In general, low pH of the soil or sediment increases mobility of
inorganics (EPA, 2000). Some metals are strongly adsorbed to inorganic materials while others
adsorb to organic matter. Some metals do not adsorb to soils or sediment at all while others always
do. This tendency to adsorb to soils dramatically affects the movement of metals from surface soils
downward into subsurface soil and groundwater and offsite carried in runoff.
Many metals in surface water are generally present in a dissolved state. Metal adsorption to
sediments is very complex and is related to physical and chemical properties of the sediments
themselves. Some metals are strongly adsorbed to inorganic materials while others adsorb to
organic matter. This dramatically affects the partitioning of metals between the sediment and
overlying surface water.
2.1.5.4 Contaminants in Groundwater. Depth to groundwater at this site is typically 30
feet or less in most locations. In general, there are no significant direct exposure pathways for
ecological receptors to groundwater. Contaminants detected in groundwater collected at the site
include VOCs and inorganics. Of these contaminants, the VOCs and some metals may be
mobile in groundwater. Several metals have a high affinity for organic material in soils and
would not be likely to migrate into groundwater. However, due to the relief of the area,
2-27 Draft
Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
groundwater contaminated with VOCs and metals from the site may emerge as surface water in
the wetland complexes, ponds, and streams. Once in surface water, VOCs are likely to volatilize
rapidly and probably do not represent a significant exposure pathway.
2.2 Potentially Complete Exposure Pathways
For an exposure pathway to be complete, a chemical must be able to travel from the source to
ecological receptors and be taken up by the receptors via one or more exposure routes (EPA, 1997).
Incomplete exposure pathways are characterized by either a disruption in chemical transport to
plants or animals or by the absence of chemicals in a medium to which an ecological receptor is
exposed. Identifying complete exposure pathways before the analysis step focuses the exposure and
ecological effects analyses on only those chemicals that can reach ecological receptors. For the
purposes of this SERA, exposure pathways to wildlife will include:
• Dermal absorption and direct ingestion of contaminants m soil to soil organisms
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( earthworms, insects), I
• Dermal absorption, absorption across the gill epithelium, and direct ingestion of
contaminants in sediment and surface water (benthic invertebrates and fish), and
• Indirect exposure of predatory wildlife (vertebrates) to bioaccumulative contaminants
through the food chain.
Based on the observations at the site, there are seven potential sources of contamination:
• Contaminated surface soils in the maintained lawn habitat.
• Contaminated surface soils in the old field habitat.
• Contaminated surface soils in the shrub/scrub habitat.
• Contaminated sediment in the drainage ditch.
• Contaminated sediments in the wetland complexes, ponds, and streams.
• Contaminated surface water in the wetland complexes, ponds, and streams.
• The potential for contaminated groundwater at the site to discharge to surface water
A graphical representation of complete exposure pathways to ecological receptors through direct
exposure or food-chain transfer is presented in Figure 2-6.
2-28 Draft
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--·--

-
-

-
---1!!11 ----
Herbivores TerTeStrial Carnivores
Bloac:cumulatlon of Cd, Cr, Jngestxm Bloac:cumutatlon of Cd, Cr, cu, Cu, Pb, Ni, Se, Ag, Hg, Zn, Pb, Ni, se, Ag, Hg, Zn, and PAHs
and PAHs
Air e
Volatilization of 0
voes \j e ~ 0 .s .\j
Plants !f 0
" Uptake of Cd, Cr, Cu, ;, i D Sam~edMe<Ua
0 e
lliOUptal<e • :; i~ Pb, NI, Se, Ag, Hg, ] Complete Exposure Pathway ·1 Zn, and PAHs Ingeslloo .. ·g a ·············► Incomplete Exposure Pathway
~ I;:
Incident:11 Ingestion
~:·:·i;SUifJ6!;So]fl~ :;_tr._ Ingestion Terrestrial Insectivores
Bloacx:umulatlon of Cd, Cr, Cu, Pb, V P.COPC:.v~; sy~, ·. ""..,.: Soil Organisms NI, Se, Ag, Hg, Zn, and PAHs s.--: ;J) ~ '""eta1·1•"'-;,""".;k-t¥l·• Ingestion, t.~ .._, ''i·i~ --~ ~:~ .. ~· .. >, PCOPC: voes, svoes,
'"' .. °'l ;:'\..Jj;j -I "'1 .... ··~lt".;lt,.,,,--, absorption metals t?'°.d: ';-->a·:,--j-_ .. , ,-;] ' ·:'.-~.:~·i
e ~ "1 J-..,. 0 ~ ~ .ri(\ j 2 Blouptake B C, ;,, ;> -~~~-:-V.-""'"-;-{I". ,-~--.. ~ t;ll· ,,,;:,1 ;c-
Aquatic PlantsP\/ -,"'.Ditch Sediments, ... InQestion Aquatic Herbivores al ., __ i;,"i •••.•.. ~,,.,. ---~ ""· ·"'"~ ' --Subsurface -~ '·~ 'P,COl>_C:·.PAl:fs arid--; ".b-1;
r-+ Uptake of As, Cu, Pb, NI, Zn and Bioac:cumulation of As, Cu,
, ~,\~,:')metals\'.;'. ;,'f; J PAHs \./ Pb, Ni and PAHs Soil ' .. _ . ..,_. •.;;~':. :,f' .... ,:,;;, ... ~-J
e 1i ! ~ e .-i,-,
e' e ! ·iJ e 2 Benthic Invertebrates InQestiOo Aquatic Insectivores 0 0 e R°8 0 m ~: 0 ~ a .-~j "~ and Fish Bloaccumulatlon of As, Cd, 14-~~ j E' ~~ E Bioaa:umulatlon of As, Cd, Cu, Cu, Pb, Ni, Zn and PAHs ~ Pb, NI, Zn and PAHs ~ " ~ ·.I!!' ·-:_,,,. ·i• ½.:._" .,,:~ ":1_
Ground I--l .7,D1tcli-Surface,, ,,
Water ···r~·'t"" , ... -. w· .. -: -•~. ,}·-Fish InQestioo Pisclvores ' , , ,.Waters,.; ,1 . ,, 14-'-¾PCOPci'Cd~Pb~Ni*-; Bloaa:umulatlon of Cd, Pb, NI, Bloaccumulation of As, Cd,
Recharge ' 0 • " :.,.,. ~' ' • , :.., • : and Zn Cu, Pb, NI, Zn and PAHs r"--..'-?Jl.t );'\~n_!I Zn;;_; ·,.--¥ ,~ Ingestion,
'"· · · · • • • ~ .t. absorption
'\.
~n,absorptlem
'
Sigmon's Septic Tank Site Figure 2-6 ~. Screening Level Ecological Risk Assessment Potentially Complete Exposure Pathways BLACK & VEATCH Statesville, Iredell County, North carolina
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
2.3 Abiotic Screen
The abiotic screen includes a comparison of the contaminants detected in surface soil, sediment, and
surface water (freshwater) to the respective EPA Region 4 ecological screening values [obtained
from EPA Region 4 Ecological Risk Assessment Bulletins --Supplement to RAGS (1999)].
Groundwater concentrations were not evaluated quantitatively based on recent USEPA guidance
indicating that groundwater should only be evaluated qualitatively since there are no present
exposure pathways to ecological receptors (EPA Region 4 in Ecological Risk Training Course,
March 2000). The screening-level benchmark concentrations selected for this SERA are presented
in Tables 2-2 through 2-4.
2.3.1 Exposure Point Assumptions
In estimating wildlife exposures for the SERA, the maximum contaminant concentrations detected
in surface water, sediment, and surface soil were be used to ensure potential ecological threats are
not missed (EPA, 1997). The range of concentrations of contaminants in each media are also
presented in Tables 2-2 through 2-4.
2.3.2 Data Quality Considerations
In determining the data suitability for evaluating ecological risks, the SERA included a comparison
of the sample quantitation limits (SQLs) to the screening-level benchmarks. This comparison is
also shown on Tables 2-2 through 2-4 and discussed in the uncertainty section of this SERA.
2.3.3 Exposure Assumptions
For this SERA, several conservative assumptions were made due to the lack of site specific
information. Some of the conservative assumptions included in this SERA included:
• Area Use Factor: It is assumed that the ecological receptor's total exposure is entirely
within the most contaminated area.
• Bioavailability: It is assumed that I 00 percent of the contaminants detected during all
investigations is available to ecological receptors.
• Contaminant Distribution: It is assumed that the maximum concentration detected during
all investigations is distributed evenly throughout the exposure area.
2-30 Draft
Sigmon's Septic Tank Site October 18, 2001
Screening-Leve\ Ecological Risk Assessment
2.4 Screening Level Risk Characterization
For this SERA, risks to ecological receptors are evaluated by generating hazard quotients (HQs) for
each contaminant in each media. The HQ is the ratio that is expressed as an exposure concentration
(maximum detected concentration) divided by an effects concentration (screening value) as shown
below.
HQ= Maximum Contaminant Concentration /Screening Value
A HQ less than one indicates that the contaminant alone is unlikely to cause adverse ecological
effects. The screening level risk calculation is a conservative estimate to ensure that potential
ecological threats are not overlooked (EPA, 1997). The results of this screening calculation should
serve only to determine whether a contaminant presents negligible risk or whether additional site
specific information needs to be further evaluation.
There are several factors that influence the evaluation of analytical data that may produce
uncertainty, which must be addressed in the SERA. Screening values are not available for every
compound that is typically analyzed at Superfund sites. SQLs are often higher than the ecological
screening values; therefore, the absence of significant risk cannot be accurately stated. Given these
confounding factors, there are typically five possible designations for constituents that are typically
evaluated at Superfund sites during the SERA:
• Type I Preliminary Contaminants of Potential Concern (PCOPCs)
• Type II PCOPCs
• Type III PCOPCs
• Type IV PCOPCs
• Contaminants Not Presenting a Significant Risk
Type I PCOPC. A contaminant is a Type I PCOPC if detected above the SQL and has a screening
value that generates a HQ above one. Also included as Type I PCOPC are "J-" qualified data which
indicate estimated concentrations of contaminants detected below the SQL but above the method
detection limit (MDL) or the instrument detection limit (IDL).
2-31 Draft
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Leve\ Ecological Risk Assessment
Type II PCOPC. A contaminant is a Type II PCOPC when it is detected but a screening value is not
available to calculate a HQ. The contaminant is present but the risk presented by that contaminant
can not be determined without a screening value.
Type III PCOPC. A contaminant is a Type III PCOPC when it is not detected, a screening value is
available, but the screening value is below the SQL. While the contaminant was not reported at
·• levels greater than the SQL, concentrations below the SQL could still be above the screening value
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and present a significant ecological risk.
Type IV PCOPC. A contaminant is a Type IV PCOPC when it is not detected and a screening
value is not available to generate a hazard quotient (HQ). It is not known if the contaminant
presents an ecological risk because it was not detected; however, levels below the SQL may still
present a significant ecological risk if above the screening value, if there were one. Without a
screening value, the risk is uncertain.
Contaminants Not Presenting a Significant Risk. There are two scenanos that result in no
ecological risk; I.) The chemical is detected and has a screening value that generates a HQ less than
one, or 2.) The chemical is not detected and the SQL is less than the screening value.
Screening-level HQs are presented in Tables 2-2 through 2-4 for surface soil, sediment, and surface
water. PCOPCs were then selected for further evaluation in subsequent steps of this ecological risk
assessment process based on the four PCOPC types discussed previously.
2.4.1 Risk Characterization from Soils
The maximum concentrations found in surface soil were compared to the screening values selected
for this SERA to produce HQs. A detailed list showing each individual contaminant and their
respective screening values is presented in Table 2-2. PCOPCs in surface soils, tabulated by type
classification, are presented in Table 2-5.
2-32 Draft
Type I PCOPC
CHLOROBENZENE
ETHYL BENZENE
~TOl.UENE-
Tc5't"Al"xYt:ENES-
ANTHRACENE
'..,;BENZO:A:PYR~
""FLUORANTW&NE-
.,-N,Y>KTHA.LEJ,1.-
-PHENA)ITHR!cN?'•-
-PVRENE•
PHENOL
,.At:UMINUM..
,_ANTIMONY
BARIUM-
--OAOMtUM·•.,.
.., e, r en Iu ,1
COPPE'ft•-
IRON_,
~iAO•
~~ESI.-
-NICisEL •
SELENIUM
-sn.NERc••
TOTAl;MERCURY~
~VANADIUM
-z1Nc-•-
~AHt'•
Table 2-5
Preliminary Contaminants of Potential Concern in Surface Soil
Sigmon's Septic Tank Site
Statesville, Iredell County, North Carolina
Type II PCOPC Type Ill PCOPC
I 2•DICHLOROBENZENE CHLOROFORM
I .J-OICHLOROBENZENE TRICHLOROETHENE (rRICHLOROETIWLENEJ
I.~ -DIC H LOROBENZENE 2.4.!i-TR!CHLOROPHENOL
ACETONE 2.4.6-TR!CHLOROPHENOL
CARSON DISULFIDE 2.4-DINJTROPHENOL
ISOPROPYLBENZENE 4-NlTROPHENOL
METHYL ETHYL KETONE ATRAZINE
METHYL ISOBITTYL KETONE HEXACHLOROBENZENE (HCB) •
METHYLCYCLOHEXANE HEXACHLOROCYCLOPENTADIENE (HCCP) •
~.CHLOROANJUNE PENTACHLOROPHENOL •
2-METHYLNAPHTHALENE TETRACHLOROETHENE
BENZALOEHYOE TETRACHLOROETHYLENE
BENZO(A)ANTHRACENE •
BENZO(B)FLUORANTHENE '
BENZO(GHl)PERYLENE •
BENZO(K)FLUORANTHENE'
BENZYL BITTYL PHTHALATE
BIS/2-ETHYLHEXYLl PHTHALATE
CHRYSENE •
INDENO C l,l.3-CD) PY RENE •
CALCIUM
MAGNESIUM
POTASSIUM
SODIUM
FLUORENE
METHYL BITTYL KETONE
{3-ANDIOR4-)METHYLPHENOL
I.I-BIPHENYL
.. Note. -indicates a b:oaccumutat:ve const1t1uent w1th food-cha:n transfer potential
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l,l.l•TRICHLOROETHANE I
1.1.2.2-TFI'RACHLOROETHANE
1.1.2-TRlCHLOROETHANE
I .l.2-TRICHLOR0.1.2.2•TRIFLUOROETHANE (FREON 113)
l.!-D!CHLOROETHANE
1.1-DlCHLOROETHENE (I. 1-D!CHLOROETHYLENE) I
1.2.4-TRICHLOROBENZENE '
I.2-0IBROM0-3.CHLOROPROPANE (OBCP)
l,l-DlBROMOETHANE (EDBl
BROMOD!CHLORQMETHANE
BROMOMETHANE
BROMOFORM
CHLOROETHANE
CHLOROMETHANE
CJS-l.2-DICHLOROETHENE
ClS-I.3-DICHLOROPROPENE I
D!BROMOCHLOROMETHANE
DICHLORODlFLUOROMETHANE
METHYL ACETATE
METHYL T-BUTYL ETHER {MTBE)
METHYLENE CHLORIDE I
TRANS-I.2-DICHLOROETHENE
TRANS-I.3-0ICHLOROPROPENE
TR!CHLOROFLUOROMETHANE
VINYL CHLORIDE
2.4-DlCHLOROPHENOL I
2.4-DlMETHYLPHENOL
1. 4-DINTTROTOLUENE
2.6-DINITROTOLUENE
l-CHLORONAPHTHA.LENE
l-CHLOROPHENOL I
1-METHYL-4 .6-DINJTROPHENOL
2-METHYLPHENOL
2-NTTROANlUNE
1-NlTROPHENOL
3.3'-0ICHLOROBENZIDINE I
3-NIT'ROANILINE
4-BROMOPHENYL PHENYL ETHER
4-CHLORC-3-METHYLPHENOL
•-CHLOROPHENYL PHENYL ETHER •
•-NITROAN!LINE I
ACENAPHTHYLENE
ACETOPHENONE
B!S(2-CHLOROETHOXY)METHANE
B1S(2-CHLOROETHYL) ETHER
B!S{l-CHLOROISOPROPYL) ETHER I
CAPROLACTAM
CARBAZOLE
DtBENZO(A.H)ANTHRACENE •
DIBENZOFURAN
D!-N-OCTYLPHTHA.LATE I
HEXACHLOROBITTADIENE •
HEXACHLOROETHANE
ISOPHORONE
N-NTTROSOD!-N-PROPYLAMINE I N-NITROSODIPHENYLAMINEIDIPHENYLAMINE
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
2.4.2· Risk Characterization from Sediment
The maximum concentrations found in sediment were compared to the screening values selected for
this SERA to produce HQs. A detailed list showing each individual contaminant and their
respective screening values is presented in Table 2-3. PeOPes in sediment, tabulated by type
classification, are presented in Table 2-6.
2.4.3 Risk Characterization from Surface Water
The maximum concentrations found in surface water were compared to the screening values
selected for this SERA to produce HQs. A detailed list showing each individual contaminant and
their respective screening values is presented in Table 2-4. PeOPes in surface water, tabulated by
type classification, are presented in Table 2-7.
2.4.4 Risk Characterization from Groundwater
In accordance with recent EPA Region 4 guidance, groundwater is not screened against ecological
screening values. Rather, the potential impacts from groundwater contamination are considered
qualitatively based on fate and transport information and the potential for groundwater discharge to
surface waters. The logic behind this decision is that groundwater does not, in most cases represent
a present time contact media for ecological receptors; therefore, there is no complete exposure
pathway. However, EPA has stressed the importance of considering groundwater as a present and
future source of contamination to surface water (and all media which that surface water may
contaminate). At the SSTS site, groundwater between suspected source areas and aquatic habitats
has been shown to contain inorganics and voes. There is a potential for all metals and voes to
discharge with groundwater into the surface water of the ponds and streams located on and offsite.
Maximum concentrations of contaminants detected in groundwater are compared to EPA Region 4
screening values in the following table to determine those contaminants that may present a risk if
they discharge to surface water:
2-34 Draft
Type I PCOPC
ACENAPHTHENE
ANTHRACENE
BENZO(A)ANTHRACENE'
BENZO-A-PYRENE •
CHRYSENE •
DIBENZO(A.HJANTHRACENE •
FLUORANTHENE
FLUORENE
PHENANTHRENE •
PYRENE •
ARSENIC
COPPER
NICKEL•
ZINC•
TOTAL PAHs'
Table 2-6
Preliminary Contaminants of Potential Concern in Sediment
Sigmon's Septic Tank Site
Statesville, Iredell County, North Carolina
Type II PCOPC Type Ill PCOPC Type IV PCOPC
BENZALDEHYDE ACENAPHTHYLENE I.!, l-TRJCHLOROETHA NE
BENZO(B)FLUORANTHENE • BIS(2-ETHYLHEXYL) PHTHALA TE I, l,2.2,TETRACHLOROETHANE
BENZO[GHl)PERYLENE NAPHTHALENE \, 1,2-TRICHLOR0-1,2,2,TRIFLUOROETHANE (FREON l !))
BENZO(K)FLUORANTHENE • ANTIMONY !, 1,2,TRICHLOROETHANE
CARBAZOLE SILVER• l, 1-DICHLOROETHANE
DIBENZOFURAN TOTAL MERCURY• l .1-DICHLOROETHENE ( I, I -OlCHLOROETHYLENE)
D!METHYL PHTHALA TE 2-METHYLNAPHTHALENE l.2.4-TRICHLOROBENZENE •
INDENO 11.2)-CDJ PYRENE •' \ ,2-DIBROMQ,3-CHLOROPROP ANE (DBCP}
ALUMINUM J,2-DlBROMOETHANE {EDBJ
BARIUM !,2-DICHLOROBENZENE
COBALT 1,2.DICHLOROPROPANE
I !RON l,2-DlCHLOROETHANE
MANGANESE l,3-DlCHLOROBENZENE
MAGNESIUM l,4.DICHLOROBENZENE
POTASSIUM ACETONE
SODIUM BENZENE
VANADIUM BROMOOICHLOROMETHANE
STYRENE BROMOFORM
CALCIUM BROMOMETHANE
CARBON DISULFIDE
CARBON TETRACHLORIDE
CHLOROBENZENE
CHLOROETHANE
CHLOROFORM
CHLOROMETHANE
CIS-1,2-DICHLOROETHENE
CIS-l,3-DICHLOROPROPENE
CYCLOHEXANE
DIBROMOCHLOROMETHANE
DlCHLOROOJFLUOROMETHANE
ETHYL BENZENE
ISOPROPYLBENZENE
METHYL AC ETA TE
METHYL BUTYL KETONE
METHYL ETHYL KETONE
METHYL ISOBUTYL KETONE
' METHYL T ,BUTYL ETHER (MTBE}
METHYLCYCLOHEXANE
METHYLENE CHLORIDE
TETRACHLOROETHENE (TETRACHLOROETHYLENEJ
TOLUENE
TOTAL XYLENES
TRANS-l,2-DICHLOROETHENE
TRANS-1,3-DlCHLOROPROPENE
TRJCHLOROETHENE (TRJCHLOROETHYLENE)
TRJCHLORDFLUOROMETHANE
VINYL CHLORIDE
{3-ANDIOR 4. JMETHYLPHENOL
1,1.BIPHENYL
2,4,5-TRJCHLOROPHENOL
2,4,6-TRJCHLOROPHENOL
2,4-DICHLOROPHENOL
2.4-DIMETHYLPHENOL
2,4-DINITROPHENOL
2,4-DINITROTOLUENE
2,6-DINITROTOLUENE
2-CHLORONAPHTHALENE
2-CHLOROPHENOL
2-METHYL-4,6-DINITROPHENOL
2-METHYLNAPHTHALENE
2-METHYLPHENOL
2-N!TROANlLINE
2-NlTROPHENOL
3,3'-0ICHLOROBENZlDINE
3-NJTROANILINE
4-BROMOPHENYL PHENYL ETHER
4-CHLOR0-3-METHYLPHENOL
4-CHLOROANILINE
4-CHLOROPHENYL PHENYL ETHER•
4-NITROANILINE
4-NITROPHENOL
ACETOPHENONE
ATRAZINE
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Table 2-6
Preliminary Contaminants of Potential Concern in Sediment
Sigmon's Septic Tank Site
Statesville, Iredell County, North Carolina
Type II PCOPC Type Ill PCOPC
.. Note. -md1cates a b1oaccumulat1ve constit1uent with food-chain transfer potential
Type IV PCOPC
BENZYL BUTYL PHTHALATE
BIS{2-CHLOROETHOXY)METHANE
BIS(2-CHLOROETHYL) ETHER
B!S(2-CHLOR01S0PROPYL) ETHER
CAPROLACT AM
DIETHYL PHTHALATE
Dl-N-BUTYLPHTHALA TE
D!-N-OCTYLPHTHALA TE
HEXACHLOROBENZENE(HCBJ'
HEXACHLOROBUTADIENE •
HEXACHL.OROCYCLOPENTADIENE (HCCP) •
HEXACHLOROETHANE
!SOPHORONE
NlTROBENZENE
N-NfTROSODl•N-PROPYLAMINE
N-NITROSODJPHENYLAMINEIDIPHENYl.AMINE
PENTACHLOROPHENOL'
PHENOL
BERYLLIUM
SELENIUM
THALLIUM
Type I PCOPC
ALUMINUM
CADMIUM•
IRON
LEAD•
ZINC•
Table 2-7
Preliminary Contaminants of Potential Concern in Surface Water
Sigmon's Septic Tank Site
Statesville, Iredell County, North Carolina
Type II PCOPC Type III PCOPC
ACITONE 2,4-D!N!TROPHENOL
BARJUM 2-ME11-£YL-4,6-D!NITROPHENOL
CALCIUM BlS(2-ETHYLHEXYLJ PHTHALATE
COBALT HEXACHLOROBUT AOIENE '
MAGNESIUM HEXACHLOROCYCLOPENT AD!ENE (HCCP) •
MANGANESE COPPER'
POTASSIUM SILVER•
SODIUM TOTAL MERCURY•
4-BROMOPHENYL PHENYL ElliER
2,4,6-TRJCHLOROPHENOL
PENTACHLOROPHENOL"
Type IV PCOPC
l, !-OJCHLOROITHANE
1.2-DIBROM0-3-CHLOROPROP ANE (DBCP)
1,2-DIBROMOETI-IANE /EDB\
BROMODICHLOROMETI-IANE
BROMOMETI-IANE
CARBON DISULFIDE
CHLOROETHANE
CIS-1 )-DlCHLOROrntENE
DIBROMOCHLOROMETHANE
METHYL BUTYL KETONE
METHYL ISOBUlYL KETONE
METHYL ETHYL KETONE
TOTAL XYLENES
TRICHLOROETI--IENE (TRICHLOROETHYLENE)
VINYL CHLORIDE
0-ANDIOR 4-)METI-NLPHENOL
2,4,j-TRJCHLOROPHENOL
2,6-DINITROTOLUENE
2-CHLORON API-ITHALENE
2-METHYLNAPI-ITHALENE
2-METHYLPHENOL
2-NITROANILINE
3,3'-0ICHLOROBENZIDINE
3-NITROANILINE
4-CHLOR0-3-METINLPHENOL
4-CHLOROANIUNE
4-CHLOROPHENYL PHENYL ETI-IER •
4-NITROANILINE
ANTI--IRACENE
BENZO(A)ANTI--IRACENE •
BENZO(B)FLUORANTHENE •
BENZO(GHl)PERYLENE •
BENZO(KlfLUORANTHENE •
BENZO-A-PYRENE •
BIS(2-CHLOROETI--IOXY)METHANE
CHRYSENE •
DIBENZO(A,H)ANTI--IRACENE •
DIBENZOFURAN
DJ-N-OCTYI.PI-ITHALA TE
FLUORENE
HEXACHLOROBENZENE(HCBJ•
INDENO ( l,2,3-CD) PYRENE •
N•NITROSODI-N-PROPYLAMINE
PHENANTHRENE •
PYRENE•
VANADIUM
STYRENE
BIS(2-CHLOROISOPROPYL ETI-IER
ACENAPtCTl-lYLENE
Note: ·-md1cates a b1oaccumulat1ve const1t1uent with food-chain transfer potential
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
Chronic EPA
Constituent Maximum Freshwater Surface.
Concentration (ug/L) Water Screening Value
(u!!/Li
I, 1-Dichloroethane 3 No Value
1,2-Dichlorobenzene 8 15.8
1,3-Dichlorobenzene I 50.2
1,4-Dichlorobenzene 11 11.2
Acetone 29 No Value
Benzene 2 53
Chlorobenzene 72 195
Chloroethane I No Value
Cis-1,2-Dichloroethene 3 No Value
Total Xylenes 2 No Value
Aluminum . l .,• :iJ:··· ' 87. ··;?. ·.;·:, ' .. . ' , '·?800 ,,. ,. , . ,,,., ..
Arsenic 4.2 190
Barium 620 No Value
Calcium 210000 No Value
Chromium 86 '·· ·.,. ,. , 11 ..
' ,,, . ' ' .. ,
Cobalt 39 No Value
., :. 6.54 Copper 38 ' ; .. ... , ."·'b -" ..
11000' ... ,-· .. ' ,-,. ·, .I 1090 ( Iron ' ,
Lead 12 ,· : 1.32 . ·. . '
Magnesium 64000 No Value
Manganese 27000 No Value
Nickel 73 87.71
Potassium 11000 No Value
Sodium 120000 No Value
Total Mercury ·6.6 ''·' ,_.. '; .· , . 0,012\ ·, . r-, : .
Zinc 820 ' ... 58.~l
: ' . .. ' . ... ., .. ·. '' '(' . ., -·
As shown on this table (highlighted cells), several metals detected in groundwater could present a
risk to surface water receptors if this groundwater were to migrate into the ponds and streams.
Future remedial decisions for the site should consider groundwater as a potential present and future
source of ecological risk.
2-38 Draft
Sigmon's Septic Tank Site October I 8, 200 I
Screening-Level Ecological Risk Assessment
2,5 Uncertainty
The uncertainties in the Steps 1 and 2 are presented and evaluated to identify potential analytical
data gaps, data quality issues, the adequacy of the sample quantitation limits, and exposure
assumptions. These uncertainties are essential in determining if further evaluations are necessary
and the scope and extent of additional evaluations. The PA/SJ data has not been presented in this
SERA because of the unavailability of the raw data. However, a hit of chromium with a HQ of 1.41
was detected in the sediment sample taken below the Lambreth pond. No other media in the PA/SJ
data had contaminants with HQs over 1. No further samples were taken from the Lambreth pond
during the ES!; therefore, this surface water pathway needs to be further investigated.
2.5.1 Habitat Characterization and Sample Representativeness
The habitat descriptions included in this section are qualitative and based on limited information and
visual observations gathered during the site visit and previously reported sampling activities.
Assumptions about exposure are based on professional judgment as to the quality of the habitat
present at the site and the related potential for exposure.
The mixed residential area of the site has not been sampled; however, it can be concluded that no
waste operations have occurred in this area of the site. Additionally, the maintained lawn, onsite
pond, and northern portion of the old field have not been sampled, but it is inconclusive whether
waste operations have occurred in this area. Soil, sediment, and surface water sampling may be
needed in these areas to determine the extent of contamination onsite.
The southern portion of the old field area has been characterized fairly well by the surface soil
samples collected; however, no pesticide analysis has been conducted. Also, no soil samples have
been collected from the shrub/scrub area. Therefore, further soil samples should be collected from
these areas.
The surface water and sediment samples taken in the drainage ditches and Davidson pond have been
characterized fairly well; however, no pesticide analysis has been conducted. Further, surface water
and sediment samples should be taken from each of the primary points of entry of each drainage
pathway into the Davidson pond to determine whether contaminants previously detected in the pond
came from on or offsite sources.
2-39 Draft
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Sigmon's Septic Tank Site October 18, 200 I
Screening-Level Ecological Risk Assessment
The limited surface water and sediment samples collected along surface water pathway 1 do not
fully characterize the area. Therefore, samples should be collected from the intermittent stream and
ponds and analyzed for TCLrr AL contaminants. Further, a sample should be collected from the
perennial stream to detennine the downgradient extent of contamination.
2.5.2 Data Quality Issues for Each Media
Many of the analytical results for key constituents of concern were flagged with a data qualifier.
"J"-qualified data indicated that the compound was positively identified; however, the associated
numerical value is the approximate conce_ntration of the analyte in the sample. In surface soils, "J"-
qualified data drives the high HQ for chlorobenzene, anthracene, naphthalene, phenanthrene,
toluene, phenol, antimony, cadmium, copper, lead, and selenium. In sediment, "J"-qualified data
drives the high HQ for acenaphthene, anthracene, dibenzo(a,h)anthracene, fluorene, and copper. In
surface water, none of the contaminants with high HQs are "J"-qualified.
2.5.3 Use of Maximum Concentrations for Exposure
As is customary for a SERA, maximum concentrations of site contaminants were used when
screening PCOPCs. This is a conservative assumption which does not approximate actual
exposures at the site. In many areas, the maximum detected concentration may represent a "hot
spot." Alternatively, the limited sample coverage may not represent all possible "hot spots" in the
field and the maximum concentration may not represent the actual maximum at the site.
2.5.4 Bioavailability
This SERA assumes that all contaminants at the site are one hundred percent bioavailable and are
totally absorbed by the potential receptor organisms. In general this is a conservative assumption
since many metals and large organic molecules are not readily absorbed.
2.6 Conclusions of the SERA
The PCOPCs presented in Section 2.4 of this report include all contaminants that are cunently
assumed to potentially cause unacceptable levels of risk at the SSTS site. Based on the finding of
this SERA, a SMDP meeting should take place to discuss the next step, Problem Formulation (Step
3 of the EPA ecological risk assessment process). A list of PCOPCs for the site is presented in
Tables 2-5, 2-6, ands 2-7. It is recommended that the SMDP meeting address the following issues:
2-40 Draft
Sigmon's Septic Tank Site October 18, 200 I
Screening-Leve\ Ecological Risk Assessment
• Potentially unacceptable levels of risk to ecological receptors directly exposed to PCOPCs
in surface soil.
• Potentially unacceptable levels of risk to ecological receptors directly exposed to PCOPCs
in sediment.
• Potentially unacceptable levels of risk to ecological receptors directly exposed to PCOPCs
in surface water.
• Potential food-chain biotransfer of cadmium, copper, lead, mercury, nickel, silver, zinc,
benzo-a-pyrene, phenanthrene, pyrene, and total PAHs in surface soil.
• The impact of Type II, III, and IV PCOPCs on the ecological risks defined at the site.
• The need for pesticide analysis on all sample media to fill the data gap that will need to be
addressed for the Remedial Investigation.
• The need for, and type of, sampling required to fill the data gaps by the lack of surface water
and sediment samples along surface water pathway I.
2-4 I Draft
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Sigmon's Septic Tank Site October 18, 2001
Screening-Level Ecological Risk Assessment
3.0 References
ATSDR, 1993. Agency for Toxic Substances and Disease Registry. Toxicological Profile Series.
U.S. Department of Health and Human Services, Atlanta, Georgia.
EPA, 2000. Ecological Soil Screening Level Guidance -Draft. Office of Emergency and
Remedial Response .. Washington, D.C., July 2000.
EPA, I 997. U.S. Environmental Protection Agency Environmental Response Team, Ecological
Risk Assessment Guidance for Superfund: Process for Designing and Conducting Ecological
Risk Assessments -Interim Final. EPA 540-R-97-006, June 5, I 997.
EPA, 1999. EPA Region 4 Ecological Risk Assessment Bulletins -Supplement to RAGS.
Howard, P.H., 1989. Handbook of Environmental Fate and Exposure Data for Organic Chemicals,
Volumes 1 -V. Lewis Publishers, Boca Raton, FL.
NCDENR, 1998. North Carolina Department of Environment and Natural Resources. Preliminary
Assessment Site Investigation. Sigmon's Septic Tank Service, Statesville, Iredell County, North
Carolina, September 1998.
NCDENR, 2000. North Carolina Department of Environment and Natural Resources. Expanded
Site Investigation. Sigmon's Septic Tank Service, Statesville, Iredell County, North Carolina,
March 2000.
NHPNC, 2001. Natural Heritage Program of North Carolina. Species and Natural Community
Summary for Iredell County. From NHPNC website at http://www.ncsparks.net, October 2,
2001.
3-1 Draft
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Appendix A: Checklist for Ecological Assessment and Sampling
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Checklist for Ecological Assessment/Sampling
I. SITE DESCRIPTION
Site Name: Sigmon's Septic Tank Site
Location: Statesville, North Carolina
County: Iredell
Latitude: 35°43'02"
City: Statesville
Longitude: 80°58'20"
State: North Carolina
Approximate area of site: 15.35 acres
Is this the first site visit? IZJ Yes D No lfno, attach trip report of previous site visit(s) if available.
Dates of previous site visit(s):
Please attach to the checklist USGS topographic map(s) of the site, if availa_l:,le.
Are aerial or other site photographs available? IZJ Yes O No If yes, please attach any available
photo(s) to the site map at the conclusion of this section.
The land use on the site is:
% Urban
50 % Rural
30 % Residential
20 % Industrial ( light heavy)
% Agricultural
(Crops: __ )
% Recreational
(Describe; not if it is a park, etc.
The area surrounding the site is:
.LQ mile radius
% Urban
20 % Rural
30 % Residential
% Industrial ( light heavy)
50 % Agricultural
(Crops: __ )
% Recreational
(Describe; not if it is a park, etc.
Has any movement of soil taken place at the site? IZJ Yes D No. lfyes, please identify the most
likely cause of this disturbance:
0 Agricultural Use IZJ Heavy Equipment
CHECKLIST FOR ENVIRONMENT AL ASSESSMENT/SAMPUNG
VER. 4.14.2000
D Mining
Ii],
BLACK & VEATCH
D Natural Events D Erosion D Other
Please describe: The lagoon sludges were excavated to a depth of IO feet, mixed with sawdust, and piled
onsite. This area is now know as the waste pile area
Do any potentially sensitive environments exist adjacent to or in proximity to the site, e.g. Federal
and State parks, National and State monuments, wetlands, prairie potholes? Remember, flood plains
and wetlands are not always obvious; do not answer "no" without confirming information.
~ Yes D No. If yes, describe them briefly below, identify the source ofinfonnation used in the
determination and show on site map:
Wetlands are located on the fringes of the onsite pond.
What type of facility is located on the site?
D Chemical D Manufacturing D Mining
~ Waste disposal ~ Other (specify): Septic Waste Disposal
What are the suspected contaminants of concern at the site? If known, what and where are the
maximum contaminant levels?
Metals VOCs and SVOCs
See SERA tables for concentrations
Check any potential routes of off-site migration of contaminants observed at the site:
□ Swales □ Depressions ~ Drainage ditches
~ Runoff □ Windblown particulates □ Vehicular traffic
□ Other (specify):
If known, what is the approximate depth to the water table? >24 inches
Is the direction of surface runoff apparent from site observations? ~ Yes D No. If yes, to which
of the following does the surface water runoff discharge? Indicate all that apply.
~ Surface water D Groundwater D Sewer D Collection impoundment
Is there a waterbody anywhere on or in the vicinity of the site? (NOTE: If yes, also complete Section
111: Aquatic Habitat Checklist -Non-Flowing Streams and/or Section IV: Aquatic Habitat Checklist -
Flowing Systems) ~ Yes D No. lfyes, identify the waterbody below and on the site map:
On-site Pond (contains minimal water)
Drainage Ditches, Davidson Pond, intermittent stream, Lambreth Pond-off site
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLrNG
VER. 4.14.2000
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Is there a navig:tble waterbody or a tributary to a navigable waterbody? [8l Yes D No. If yes,
identify the waterbody below and on the site map:
Drainage ditches drain into Davidson Pond which drains into a intermittent stream which drains into the
Catawba River. Lambreth Pond drains into a intermittent stream which drains into the Catawba River. The
on-site pond is only inundated with 1-2 inches of water; therefore, it does not drain into any waterbody.
Is there evidence of flooding? (NOTE: If yes, also complete Section V: Wetland Habitat Checklist)
D Yes [8J No.
How much time was spent at the site identifying flora and fauna? ;)_ hours
Please provide references for field guides used to aid in the identification of flora and fauna at the
site:
Audobon Society Field Guides for Reptiles and Amphibians, Insects, Birds, Trees and Wildflowers
Newcomb, L. 1977. Newcombs Wildflower Guide.
Are there any threatened and/or endangered species (plant or animal) known to inhabit the area of
the site? (NOTE: If yes, you are required to verify this information with the U.S. Fish and Wildlife
Service). D Yes [8l No.
Sources of information consulted:
[8) U.S. Fish and Wildlife Service
D Other (specify):
[8J State Natural Heritage Program
List identity and expected habitats for these species below:
Scientific Name:
I.
2.
3.
4.
5.
General habitat:
What are the soil types and general characteristics (e.g. sandy, loamy, clay, organic, etc) present at
the site as listed in the County Natural Resource Conservation District Soil Surveys?
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLJNG
VER. 4.14.2000
~-BLACK & VEATCH
Soil Name:
1. As82
2.
3.
4.
5.
General characteristic:
Appling sandy loam, 2 to 6 percent
slope. eroded
Record the weather conditions at the time of this site investigation:
Date: September. 2001
.l,Q Temperature ('C)
light Wind speed (mph)
clear Cloud cover (clear. overcast. dense)
Normal high temperature (18°C)
none Precipitation (form)
Please provide a map showing the site layout, photograph locations, the location of ecological
features observed at the site as an attachment to this checklist.
Indicate which habitat checklists are included with this ecological checklist:
~ Terrestrial Habitats
~ Aquatic Habitats -Flowing Systems
Completed by: S. Shah
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000
~ Aquatic Habitats -Non-Flowing Systems
~ Wetland Habitat
Affiliation: Black & Veatch
Date: September 26, 200 I
~-BLACK & VEATCH
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II. TERRESTRAL HABITAT CHECKLIST
IIA. WOODED HABITATS
· Are there any wooded areas at the site? D Yes IZ] No. lfno, go to Section IIB: Shrub/Scrub Habitats.
How much of the site is wooded? acres OR %. Indicate the wooded area on the site map attached to
this copy of the checklist.
What are the dominant types of vegetation in the wooded area?
D Evergreen D Deciduous D Mixed
Dominant plant specie(s):
What is the predominant size of the trees at the site (DBH)?
D O to 6 inches D 6 to 12 inches D Greater than 12 inches
Is there a well-developed understory? D Yes D No. If yes, what are the dominant plant species:
I.
2.
11B. SHURB/SCRUB HABITATS
Are there any shrub/scrub areas at the site? IZJ Yes D No. Ifno, go to Section IIC: Open Field
Habitats.
How much of the site is covered by shrub/scrub vegetation? l acre OR %. Indicate the shrub/scrub
area on the site map attached to this copy of the checklist.
Dominant plant specie(s):
I. Honeysuckle
What is the average height of the shrub/scrub vegetation at the site?:
O0to2feet IZJ 2 to 5 feet D Greater than 5 feet
Based on site observations, how dense is the shrub/scrub vegetation?
IZ] Dense D Patchy D Sparse
IIC. OPEN FIELD HABITATS
Are there any open field areas at the site? IZJ Yes D No. If yes, please indicate the type below.
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000
~.
BLACK & VEATCH
D Prairie/plains
[8J Lawn
D Other (specify):
D Savannah
D Barren
[8J Old field
How much of the site is open field? ll..acres OR %. Indicate the open field areas on the site map
attached to this copy of the checklist.
What are the dominant species of open field vegetation?
_L orchard grasses
i honeysuckle
J lawn grasses
What is the average height of the open field vegetation at the site?:
D O to 6 inches [8J 6 to 24 inches
Based on site observations, how dense is the open field vegetation?
D Dense [8J Patchy
IID. MISCELLANEOUS
D Greater than 24 inches
D Sparse
Are other types of terrestrial habitats present at the site, other than those identified above? [8J Yes D No. If yes, identify on the site map and describe them below:
In the most Northern section of the site a mixed residential forest can be found. Mary Simon's house is
located here. It can be speculated from prior investigations that no waste operations have occurred here.
Were wildlife observations made in terrestrial habitats of the site? [8J Yes D No. If yes, identify
locations on the site map and identify the species (common or scientific names) below:
Insects Hemtiles Birds Mammals
I. Ants I.
2. Flies (digtera) 2.
3. Mosguitos 3.
4. 4.
5. 5.
6. 6.
7. 7.
8. 8.
9. 9.
10. 10.
CHECKLIST FOR ENVIRONMENT AL ASSESSMENT/SAMPUNG
VER. 4.14.2000
I. Cardinal I.
2. Blue Jay 2.
3. 3.
4. 4.
5. 5.
6. 6.
7. 7.
8. 8.
9. 9.
I 0. 10.
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Ill. AQUATIC HABITAT CHECKLIST-NON-FLOWING SYSTEMS
Note: Aquatic systems are often associated with wetland habitats. Please refer to Section V, Wetland
Habitat Checklist if appropriate.
What types of open-water, non-nowing system are present at the site?
D Natural (pond, lake)
[g] Artificially created (lagoon, reservoir, canal, impoundment, quarry)
Complete the characteristics table below for each waterbody at or adjacent to the site?
Characteristic Name: Onsite Name: Lambreth Name: Davidson Name: Williams
Pond Pond Pond Pond
Size (acres) 1.25 1.50 1.50 1.75
Average 2 inches i i unknown Depth (feet)
Aquatic [gj Emergent [g] Emergent [g] Emergent D Emergent
vegetation D Submergent [gj Submergent [gj Submergent D Submergent type
D Floating D Floating D Floating D Floating
Substrate □Bedrock □Bedrock □Bedrock □Bedrock
□Boulder(> I 0 □Boulder(> IO in.) □Boulder(> IO in.) □Boulder (>IO
in.)
QCobble (2½-10 in) □Cobble (2½-10 in)
in.)
□Cobble (2½-□Gravel (0.1-2½ in) □Gravel (0.1-2½ in)
□Cobble (2½-
10 in) 10 in)
□Gravel (0.1-(g]Sand (coarse) (g]Sand (coarse) □Gravel (0.1-
2½ in) 0Silt (fine) 0Silt (fine) 2½ in)
(g]Sand (coarse) □Marl (shells) □Marl (shells) 0Sand (coarse)
0Silt (fine) □Clay (slick) OCiay (slick) 0Silt (fine)
□Marl (shells) □Muck (fine/black) □Muck (fine/black) 0Marl (shells)
□Clay (slick) □Debris □Debris □Clay (slick)
□Muck 0Detritis 0Detritis □Muck
(fine/black) (fine/black)
□Debris □Concrete □Concrete □Debris
0Detritis OOther: OOther: 0Detritis
□Concrete □Concrete
Name: Siwinski
Pond
2.0
unknown
[g] Emergent
[gj Submergent
D Floating
□Bedrock
□Boulder (>IO
in.)
□Cobble (2 ½-
10 in)
□Gravel (0.1-
2½ in)
0Sand (coarse)
0Silt (fine)
□Marl (shells)
□Clay (slick)
□Muck
(fine/black)
□Debris
0Detritis
□Concrete
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000 BLACK & VEATCH
Characteristic Name: Onsite Name: Lambreth
Pond Pond
OOther:
Source of □River/Stream □River/Stream
water in
waterbody □Groundwater IS]Groundwater
□Discharge □Discharge
IS]Surface runoff IS]Surface runoff
O0ther: OOther:
Narrative Surface runoff Surface runoff fi-om
description of fi-om grasslands vegetation from site. flow path into
waterbody habitats also sgring is located
nearby
Waterbody ONo discharge ONo discharge
discharges □River/Stream IS]River/Stream into:
□Groundwater □Groundwater
□Discharge □Discharge
IS]Surface runoff IS]Surface runoff
OOther: OOther:
Field __ water temp --water temp (0 C)
measurements (°Cl __ pH
NONE _pH
TAKEN __ dissolved 0 2
DURING --dissolved
SITE o, __ salinity
INVESTI-
GATION __ salinity __ turbidity (clear-
CL, opaque-OP,
__ turbidity slihgtly turbid-ST,
(clear-CL, turbid-Tl
opaque-OP,
slihgtly turbid-__ Secchi depth
ST, turbid-Tl Other:
Secchi
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000
Name: Davidson
Pond
□River/Stream
□Groundwater
IS]Discharge
□Surface runoff
OOther:
Drainage ditches are
connected by culverts
that discharge into
the gond
ONo discharge
IS]River/Stream
□Groundwater
□Discharge
□Surface runoff
OOther:
--water temp (°Cl
_pH
__ dissolved 0 2
__ salinity
__ turbidity ( clear-
CL, opaque-OP,
slihgtly turbid-ST,
turbid-Tl
__ Secchi depth
Other:
Name: Williams
Pond
O0ther:
□River/Stream
□Groundwater
□Discharge
□Surface runoff
OOther:
ON o discharge
IS]River/Stream
□Groundwater
□Discharge
□Surface runoff
OOther:
__ water temp
coq
_pH
dissolved --o,
__ salinity
__ turbidity
(clear-CL,
opaque-OP,
slihgtly turbid-
ST, turbid-Tl
Secchi
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Name: Siwinski I Pond
OOther: I
□River/Stream ~ I
□Groundwater 11
□Discharge I
□Surface runof1
OOther:
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ONo discharge I
IS]River/Stream
□Groundwater I
□Discharge
□Surface runofl
OOther:
__ water tern,
coq
_pH
__ dissolved I o,
__ salinity I __ turbidity
( clear-CL, 1 opaque-OP,
slihgtly turbid-
ST, turbid-Tl
Secchi J
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Characteristic Name: Onsite Name: Lambreth
Pond Pond
depth
Other:
Color and Mucky (light Small duckweed
area of brown) found on top layer coloration
Benthic DEPT taxa OEPTtaxa
invertebrates
OChironomids OChironomids
OWorms □Worms
Other Other invertebrates:
invertebrates: 1. Tadpoles
I. None 2.
observed 3.
2. 4.
3. 5.
4.
5.
Fish
I. None 1. None observed
observed 2.
2. 3.
3. 4.
4. 5.
5. 6.
6.
Herptiles
I. None 1. None observed
observed 2.
2. 3.
3.
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000
Name: Davidson Name: Williams Name: Siwinski
Pond Pond Pond
depth depth
Other: Other:
Small duckweed Small duckweed
found on top layer found on top
layer
DEPT taxa OEPTtaxa DEPT taxa
OChironomids OChironomids OChironomids
□Worms □Worms □Worms
Other invertebrates: Other Other
1. Tadpoles invertebrates: invertebrates:
2. I. I.
3. 2. 2.
4. 3. 3.
5. 4. 4.
5. 5.
I. None observed I. I.
2. 2. 2.
3. 3. 3.
4. 4. 4.
5. 5. 5.
6. 6. 6.
I. None observed I. I.
2. 2. 2.
3. 3. 3.
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Characteristic Name: Onsite Name: Lambreth
Pond Pond
Birds
I. Cardinal I. None observed
2. 2.
3. 3.
CHECKLIST FOR ENVIRONMENT AL ASSESSMENT/SAMPLING
VER. 4.14.2000
Name: Davidson
Pond
I. None observed
2.
3.
Name: Williams
Pond
I.
2.
3.
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IV. AQUA TIC HABITAT CHECKLIST -FLOWING SYSTEMS
Nore: Aquatic systems are often associated with wetland habitats. Please refer to Section V, Wetland
Habitat Checklist if appropriate.
What types of flowing water systems are present at the site?
□ River ~ Stream D Creek
□ Dry wash □ Arroyo □ Brook
~ Artificial (ditch, canal) ~ Intermittent stream □ Channeling
□ Other (specify):
Complete the characteristics table below for each waterbody at or adjacent to the site?
Characteristic Name: Drainage Name: Intermittent
Ditches Stream
Width (feet) J ;i_
Average Dried ug Dried ug Depth (feet)
Physical D Yes ~No □Yes ~No
alterations
Aquatic D Emergent D Emergent
vegetation D Submergent D Submergent type
D Floating D Floating
Tidal D Yes ~No OYes ~No
influence? MHWL: MHWL:
Basis for Basis for
detennination: determination:
Bank Bank hght: I Bank hght: 3-4 ft.
conditions Slope: H:V Slope: £1 H:V and cover
Plant cover: B Plant cover: Debris
(Trees=T, shrub=S, (Trees=T, shrub=S,
herbs=H, barren=B) herbs=H, barren=B)
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLJNG
VER. 4.14.2000
Name: Perennial Name:
Stream
~
unknown
OYes ~No D Yes ONo
D Emergent D Emergent
D Submergent D Submergent
D Floating D Floating
□Yes ~No OYes ONo
MHWL: MHWL:
Basis for Basis for
determination: determination:
Bank hght: 4-5ft. Bank hght: __ ft.
Slope: £1 H:V Slope: __ H:V
Plant cover: unknown Plant cover:
(Trees=T, shrub=S, (Trees=T, shrub=S,
herbs=H, barren=B) herbs=H, barren=B)
~-BLACK & VEATCH
Characteristic Name: Drainage Name: Intermittent
Ditches Stream
Perennial D Yes [ZJ No D Yes [ZJ No
Flow?
Substrate □Bedrock □Bedrock
□Boulder(> IO in.) □Boulder(> IO in.)
□Cobble (2½-10 in) □Cobble (2½-10 in)
□Gravel (0.1-2½ in) OGravel (0.1-2½ in)
OSand (coarse) OSand (coarse)
OSilt (fine) OSilt (fine)
OMarl (shells) OMarl (shells)
□Clay (slick) □Clay (slick)
OMuck (fine/black) OMuck (fine/black)
□Debris [Z]Debris
ODetritis ODetritis
□Concrete □Concrete
[Z]Other: grass OOther:
Discharge [Z]Yes ONo [ZJ Yes D No
from the site
into the Drainage ditches are Intermittent stream
waterbody connected by was dry during the and
description culverts: however all site visit.
were dry during site Intermittent stream
visit. Ditches discharges into a
discharge into ~erennial stream.
Davidson gond
Waterbody ONo discharge ONo discharge
discharges
ORiver/Stream [Z]River/Stream into:
□Groundwater □Groundwater
□Discharge □Discharge
□Surface runoff □Surface runoff
OOther:
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000
Name: Perennial Name:
Stream
[ZJ Yes D No OYes ONo
□Bedrock □Bedrock
□Boulder (>10 in.) □Boulder (>10 in.)
[Z]Cobble (2½-10 in) □Cobble (2½-10 in)
□Gravel (0.1-2½ in) OGravel (0.1-2½ in)
OSand (coarse) OSand (coarse)
[Z]Silt (fine) OSilt (fine)
OMarl (shells) OMarl (shells)
□Clay (slick) □Clay (slick)
OMuck (fine/black) OMuck (fine/black)
□Debris □Debris
ODetritis ODetritis
□Concrete □Concrete
OOther: OOther:
D Yes ONo OYes ONo
Perennial stream
discharges into the
Catawba river.
However, during the
site visit the gerennial
stream was not
visually insgected.
ONo discharge ONo discharge
[Z]River/Stream □River/Stream
□Groundwater □Groundwater
□Discharge □Discharge
□Surface runoff □Surface runoff
OOther: OOther:
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Characteristic Name: Drainage Name: Intermittent
Ditches Stream
[8:]Other: pond
Field __ velocity (mph) __ velocity (mph)
measurements
__ water temp (°C) __ water temp (0C)
NONE
TAKEN _pH _pH
DURING
SITE __ dissolved 0 2 __ dissolved 0 2
INVESTI-__ salinity __ salinity GATION
turbidity (clear-CL, turbidity (clear-CL,
opaque-OP, slihgtly opaque-OP, slihgtly
turbid-ST, turbid-T) turbid-ST, turbid-T)
__ Secchi depth __ Secchi depth
Other: Other:
Color and No water observed No water observed
area of
coloration
Fish
I. Not observed I. Not observed
2. 2.
3. 3.
4. 4.
5. 5.
6. 6.
Herptiles
I. Not observed I. Not observed
2. 2.
3. 3.
4. 4.
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000
Name: Perennial Name:
Stream
__ velocity (mph) __ velocity (mph)
__ water temp (0C) __ water temp (0C)
_pH _pH
__ dissolved 0 2 __ .dissolved 0 2
__ salinity __ salinity
__ turbidity ( clear-__ turbidity ( clear-
CL, opaque-OP, CL, opaque-OP,
slihgtly turbid-ST, slihgtly turbid-ST,
turbid-T) turbid-T)
__ Secchi depth __ Secch i depth
Other: Other:
I. I.
2. 2.
3. 3.
4. 4.
5, 5.
6. 6.
I. I.
2. 2.
3. 3.
4. 4.
~-BLACK & VEATCH
Characteristic Name: Drainage Name: Intermittent
Ditches Stream
5. 5.
6. 6.
Birds
I. Not observed I. Not observed
2. 2.
3. 3.
4. 4.
5. 5.
6. 6.
Mammals
I. Not observed I. Not observed
2. 2.
3. 3.
4. 4.
5. 5.
6. 6.
CHECKLIST FOR ENVIRONMENTAL ASSESSMENT/SAMPLING
VER. 4.14.2000
Name: Perennial
Stream
5.
6.
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2.
3.
4.
5.
6.
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3.
4.
5.
6.
Name:
5.
6.
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2.
3.
4.
5.
6.
I.
2.
3.
4.
5.
6.
~-BLACK & VEATCH
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V. WETLAND HABITAT CHECKLIST
Are there designated or known areas of wetland definitely present at the site? cgJ Yes D No.
Please indicate the sources of information used to make this determination?
D National Wetland Inventory Map D State Agency cgj USGS Topo Map
0 Federal Agency
D Other (specify):
cgj Site Determination (specify method): 1987 Corns of Engineers Method
How much of the site is wetland? 6 acres OR .:S %.
to this copy of the checklist.
Indicate the wetland area on the site map attached
The total amount of wetlands includes offsite areas.
What types of wetland are preset at the site?
D Subtidal
D Palustrine forest
cgj Submergent
Dominant plant specie(s):
Juncus species
Rorippa palustris
Lemna valdiviana
D Intertidal
D Palustrine shrub/scrub
D Other (specify):
D Supertidal
cgj Palustrine emergent
Provide a general description of the physical characteristics (height, color, etc.) of each wetland
system on the site. Include a photograph of each system if available.
Green and yellow coloration, the dominant plant species ranged from 6-24 inches in height
ls standing water present in the wetland? cgj Yes O No. lfyes, be sure to complete Checklist Ill -
Aquatic Habitat -Non-Flowing Systems
If there is standing water, is it:
D Brackish cgj Fresh
ls there evidence of flooding at the site? 0 Yes cgJ No. If yes, indicate the physical indicators that are
present:
D Buttressing
D Debris lines
D Water marks
D Other (specify):
CHECKLIST FOR ENVIRONMENT AL ASSESSMENT/SAMPLING
VER. 4.14.2000
D Mud cracks
~-
BLACK & VEATCH
What are the sources of water for the wetlands at the site? Indicate the principal source with an
asterisk.
[2] Stream/River/Lake
[2] Surface runoff
D Groundwater
D Other (specify):
D Flooding (tidal)
Is there a discharge from the site into a known or suspected wetland? [2] Yes D No. If yes, please
describe below:
The drainage ditches discharge into the Davidson pond. However, during the site visit no discharge was
observed.
The onsite pond is upgradient from the known contaminated area (i.e. waste piles or lagoon area).
Is there a discharge from the wetland? [2] Yes D No. If yes, indicate the area into which the
discharge flows:
[2] Stream/River
D Marine/Estuary
D Groundwater
D Other (specify):
D Surface soil
Describe the appearance of soil in the wetland area using general color characteristics or Munsell
designation:
Soil sample was not taken from the onsite pond; however, two of the three other indicators were present.
CHECKLIST FOR ENVIRONMENT AL ASSESSMENT/SAMPLING
VER. 4. \4.2000 ~-BLACK & VEATCH
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~®
BLACK & VEATCH
1145 Sanctuary Parkway
Suite 475
Black & Veatch Special Projects Corp.
Alpharena, Georgia 30004 USA
Tel: [phone]
fax: {7701751-8322
US EPA -Region 4
Sigmon's Septic Tank Site
Remedial Investigation/Feasibility Study
Ms. Giezelle Bennett
U.S. Environmental Protection Agency Region
61 Forsyth Street, I I'" Floor
Atlanta, GA 30303
Lvu!
.. :-:-i
BYSP, , Project 048 I 40.0 IO I
IWI .IA No. 040-RICO-A44F
: 1 / / October 18, 2001 i _lJ
Subject: Draft planning documents
Dear Ms. Bennett:
Black & Veatch Special Projects Corp. (BVSPC) has completed the Draft RI/FS Work Plan and
Confidential Business Information. Additional planning documents which have been prepared for this
submittal include the Field Sampling Plan, Quality Assurance Project Plan, Site Health and Safety Plan
(HASP), two Task HASPs, Baseline Risk Assessment Work Plan, and the Screening Level Ecological
Risk Assessment Steps I and 2. Three copies of each document and the budget information work sheets
are provided.
One copy of all the planning documents, excluding the Confidential Business Information, will be
forwarded separately to Mr. Nile Testerman of the NCDENR.
If you have any questions, please contact me at 770-521-8113.
CJ a
Enclosures
Sincerely,
Black & Veatch Special Projects Corp.
Christopher J. Allen, P.E.
Project Manager
cc: Harvey Coppage, BYSPC RAC4 Program Manager w/o enclosure ' Charles Hayes, EPA Region 4 CO w/o enclosure
Robert Stern, EPA Region 4 PO w/o enclosure
Nile Testerman, NCDENR
the imagine• build company""