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SDMS DocID 236668
. . , „ . . BI02837D
DRAFT DATA EVALUATION
ADDENDUM 2
REMEDIAL INVESTIGATION/FEASIBILITY STUDY
NUTMEG VALLEY ROAD SITE WOLCOTT, CONNECTICUT
RESPONSE ACTION CONTRACT (RAC), REGION I
For U.S. Environmental Protection Agency
By Tetra Tech NUS, Inc.
EPA Contract No. 68-W6-0045 EPA Work Assignment No. 107-RICO-0198
TtNUS Project No. GN4131
July 2005
TETRA TECH NUS, INC.
RI02837D
DRAFT DATA EVALUATION
ADDENDUM 2
REMEDIAL INVESTIGATION/FEASIBILITY STUDY
NUTMEG VALLEY ROAD SITE WOLCOTT, CONNECTICUT
RESPONSE ACTION CONTRACT (RAC), REGION I
For U.S. Environmental Protection Agency
By Tetra Tech NUS, Inc.
EPA Contract No. 68-W6-0045 EPA Work Assignment No. 107-RICO-0198
TtNUS Project No. GN4131
July 2005
Deborah A. Chisholm / George D. Gardner, P.E. Project Manager Program Manager
DRAFT
TABLE OF CONTENTS DRAFT DATA EVALUATION ADDENDUM 2
REMEDIAL INVESTIGATION/FEASIBILITY STUDY NUTMEG VALLEY ROAD SITE
WOLCOTT, CONNECTICUT
SECTION
1.0 INTRODUCTION.
2.0 DATA EVALUATION 2 2.1 Groundwater Analytical Data - Round 4 Results 4
2.1.1 Cross-gradient Groundwater Analytical Results 4 2.1.2 Upgradient Groundwater Analytical Results 5 2.1.3 Study Area Groundwater Analytical Results
Monitoring Wells 5 2.1.4 Study Area Groundwater Analytical Results
Supply Wells 10
3.0 HUMAN HEALTH RISK REVIEW 10 3.1 Additional Contaminants of Potential Concern 10 3.2 Thallium 11 3.3 Manganese 12
4.0 SUMMARY AND CONCLUSIONS 12
TABLES
NUMBER
1 -1 Groundwater Sampling and Analysis Summary - May and June 2005 1-2 Monitoring Wells Sampled at Nutmeg Valley Road Superfund Site 2-1 Summary of Results and Statistics - May and June 2005 2-2 Cross Gradient Analytical Results 2-3 Upgradient Analytical Results 2-4 Study Area Analytical Results
FIGURE
NUMBER
1 Wells Sampled - May and June 2005
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INTRODUCTION
At the request of the U. S. Environmental Protection Agency (EPA), Tetra Tech NUS, Inc.
(TtNUS) prepared this Data Evaluation Addendum, which presents groundwater analytical
results from the most recent field investigation performed at the Nutmeg Valley Road Site,
located in Wolcott, Connecticut. This work was performed under Contract No. 68-W6-0045,
Work Assignment No. 107-RICO-0198.
The May - June, 2005 groundwater sampling represented the fourth round of monitoring
performed by TtNUS in support of the site on-going Remedial Investigation/Feasibility Study
(RI/FS). Round 4 consisted of collecting groundwater samples from previously existing U.S.
Geological Survey (USGS) monitoring wells, and EPA monitoring wells within the investigation
area. The sampling was performed from May 24 through June 2, 2005. Field sampling
activities were conducted in accordance with the procedures detailed in the Quality Assurance
Project Plan (QAPP), Revision 1 (TtNUS, September 2000), QAPP Addendum 1 (TtNUS, July
2002) and QAPP Addendum 2 (TtNUS, May 2005). Sample analyses were performed by
Contract Laboratory Program (CLP) laboratories assigned by the EPA.
Previous groundwater sampling events were performed by TtNUS in January 2001 (Round 1),
June 2001 (Round 2), and July 2002 (Round 3). The compiled information was used to assess
the nature and extent of the site groundwater contamination, assess potential contaminant
migration pathways, and provide information to support the baseline human health and
ecological risk assessments. The data from Rounds 1 and 2 were summarized in the Draft
Data Evaluation report (TtNUS, February 2002). The data from Round 3 were summarized in
the Draft Data Evaluation Addendum report (TtNUS, December 2002). This Draft Data
Evaluation Addendum 2 report summarizes the data collected in the Round 4 sampling.
The objective of the Round 4 sampling event was to conduct additional sampling and analysis
of groundwater to assess whether data support the site being delisted.
The purpose of this Data Evaluation Addendum is to present the Round 4 analytical results,
compare the results to results from previous rounds, and discuss the implication of these
results on risk. Section 1 summarizes the sampling and analysis procedures implemented for
Round 4. Section 2 presents and compares the analytical results to federal and state
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regulatory criteria and discusses whether the Round 4 data confirm interpretations and
evaluations of the Data Evaluation report and the Data Evaluation Addendum from December,
2002. Section 3 discusses the implications of the Round 4 analytical results on the baseline
risk assessment. Section 4 presents the Summary and Conclusions.
The fourth round of groundwater sampling was conducted by TtNUS from May 24 through
June 2, 2005. Sample collection, handling, preservation, and shipping were conducted in
accordance with the QAPP, Revision 1 (TtNUS, September 2000), and QAPP Addendum 2
(TtNUS, May 2005), which provided detailed procedures for previous periodic sampling events
(Round 1, Round 2 and Round 3). Table 1-1 presents a list of all wells sampled during Round 4
and the analyses performed. The locations of these wells are shown on Figure 1. Table 1-2
indicates the wells sampled during each of the four rounds of sampling.
Prior to the initiation of groundwater sampling, all monitoring wells were inspected to assess
whether there were any conditions that could compromise the sampling and to verify whether
each well contained sufficient water for sampling. A single round of synoptic water level
measurements was performed prior to purging and sampling the monitoring wells within the
study area. All proposed monitoring wells, with the exception of USGS well number WC-110,
the EPA well numbers MW3B and MW3S, and the commercial supply wells located at 1 and 15
Nutmeg Valley Road, were successfully purged and sampled. As in Round 3, WC-110 could
not be located. EPA well numbers MW3B and MW3S have been destroyed and are
inaccessible for sampling. The commercial wells located at 1 and 15 Nutmeg Valley Road are
no longer being used. These locations are now using the public water supply.
Samples were sent to CLP-assigned laboratories for analysis of low-concentration volatile
organic compounds (VOCs), semi-volatile organic compounds (SVOCs), pesticide/PCBs,
metals and cyanide.
DATA EVALUATION
This Section 2 of the Data Evaluation Addendum provides an assessment of the May and June
2005 Round 4 groundwater monitoring results, compares the results to available screening
benchmarks, and discusses whether the Round 4 data confirm interpretations and evaluations
of the Draft Data Evaluation Report (TtNUS, February 2002), and the Draft Data Evaluation
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Addendum (TtNUS, December, 2002), as they relate to the Rounds 1, 2, and 3 groundwater
sampling results.
Table 2-1 presents a summary of results from Round 4 and a comparison to federal Maximum
Contaminant Levels (MCLs) or 2000 EPA Region IX Preliminary Remediation Goals (PRGs).
The primary benchmarks for comparison are MCLs. If an MCL is not available for a particular
contaminant, the PRO is used. The Region IX PRGs for non-carcinogens have been adjusted
to correspond to a hazard index (HI) of 0.1, rather than an HI of 1.0. The term benchmark
criteria will be used in this document in reference to either the MCL or the Region IX PRG, as
applicable for each contaminant.
Tables 2-2, 2-3, and 2-4 present analytical results of each sample from all four rounds, and
available screening benchmarks for comparison purposes for cross-gradient, upgradient, and
study area wells, respectively. The benchmarks include MCLs, PRGs, Connecticut
Groundwater Protection Criteria for GA aquifers (CTGAGPs), and Connecticut Surface Water
Protection Criteria (SWPs).
Differences in quantitation limits observed over the course of groundwater sampling can be
explained by updates in the analytical methods. The analytical method used to analyze for low
concentration VOC during groundwater sampling Rounds 1 and 2 was OLC02.1. The required
quantitation limits for this method are 1 ppb and 5 ppb. The method used to analyze for low
concentration VOC during groundwater sample Rounds 3 and 4 was the updated method
OLC03.2 which has contract required quantitation limits (CRQL) of 0.5 ppb and 5 ppb. The
analytical method used to analyze for metals during groundwater sampling Rounds 1, 2, and 3
was ILM04.3. This method required non-detected results to be reported down to the instrument
detection limit (IDL). According to the ILM05.3 statement of work, the analytical method used
for groundwater samples during Round 4, non-detected results (values below the method
detection limit (MDL)) are reported by the laboratory at the CRQL with a "U" qualifier. The
CRQL is an order of magnitude above the IDL or MDL. Some of the screening benchmarks for
methods at this site are below the CRQL values. In order to meet the screening benchmarks,
the non-detected results for Round 4 are reported down to the MDL value. The non-detected
results are qualified in the tables as the MDL value with a UJ qualifier to reflect uncertainty at
lower reporting limits.
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2.1 Groundwater Analytical Data - Round 4 Results
As stated in Section 1, the Round 4 groundwater samples were collected for analysis of low
concentration VOCs, low concentration SVOCs, low concentration pesticide/PCBs, unfiltered
metals, cyanide, and filtered metals only for those samples where turbidity measurements
exceeded 20 NTUs after purging. The results are summarized in subsections below, according
to area (cross-gradient, upgradient, and study area).
2.1.1 Cross-gradient Groundwater Analytical Results
Following the evaluation of data from Rounds 1 and 2 and the Draft Data Evaluation Report,
eight additional "cross-gradient" overburden wells were added to the sampling program for
Round 3 to provide additional regional groundwater quality data, with respect to metals
concentrations, to compare to the "study area" groundwater metals concentrations. The wells
were selected by EPA and the U.S Geological Survey, and are located southeast of the study
area, across Old Tannery Brook and associated wetlands, in areas not impacted by study area
sources under investigation (Figure 1). The cross-gradient wells were sampled during the
Round 3 and again during the Round 4 event. The samples collected during the Round 3 and
Round 4 events were analyzed for metals and cyanide. The samples collected during Round 3
were also analyzed for low concentration thallium by ICP-MS.
Table 2-2 shows that in one or more of the cross-gradient wells, six metals (aluminum,
antimony, iron, lead, manganese, and thallium), were detected at levels exceeding benchmark
criteria. Antimony was detected for the first time in Round 4 in Well WC84. It was not detected
in any other location and was not detected in the corresponding filtered metals sample.
Thallium was detected in well WC86, but no filtered metals sample was collected. Thallium was
also detected in well WC84, but was not detected in the corresponding filtered metals sample.
Aluminum, iron, manganese, and thallium in one well, exceeded the benchmark criteria in the
unfiltered metals sample but not in the corresponding filtered metals sample. Aluminum, iron,
lead, and manganese concentrations in one unfiltered sample exceeded the benchmark
criterion, but not in the corresponding filtered sample. Cyanide was not detected in any of the
cross-gradient wells.
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2.1.2 Upgradient Groundwater Analytical Results
The upgradient wells sampled during Round 4 (MW-1S and MW-1B) were analyzed for VOCs,
SVOCs, pesticides, PCBs, metals, and cyanide. Results are presented in Table 2-3. These
wells were also sampled during Rounds 1, 2, and 3.
A review of Round 4 results from the upgradient monitoring well locations MW1S and MW1B
indicated that, with the exception of a trace detection of five VOCs (1,1-dichloroethene (0.1
ug/l), 1,4-dichlorobenzene (0.12 pg/l), dichlorodifluoromethane (0.3 ug/l), tetrachloroethene
(0.18 pg/l), and trichlorofluoromethane (0.2 ug/l) at MW1S), only metals were detected. Of
those detected metals only manganese was present at levels exceeding benchmark criteria,
however, only in an unfiltered sample. As in Rounds 1, 2, and 3, neither thallium nor cyanide
was detected in the two upgradient wells.
As summarized in the Draft Data Evaluation, the analytical results from Rounds 1, 2, and 3 for
these upgradient wells also indicated only the presence of metals, with benchmark criteria
exceeded for aluminum, chromium, iron, manganese, and nickel. Only the manganese criterion
was exceeded during Round 4.
2.1.3 Study Area Groundwater Analytical Results - Monitoring Wells
The study area wells sampled during Round 4, listed on Table 1-1, were analyzed for VOCs,
SVOCs, pesticides, PCBs, and metals. These wells were also sampled during Rounds 1, 2,
and 3 (see Table 1-2).
A discussion of the analytical results for the Round 4 groundwater sampling of monitoring wells
located in the study area is presented below according to analysis group. A summary of results
for previous sampling rounds is provided for comparison purposes in Table 2-4.
VOCs
The analytical results for the Round 4 sampling event indicate the detection of three VOCs at
low levels, at or near instrument detection limits. No VOCs were detected at levels exceeding
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benchmark criteria. The VOCs detected at low levels during the Round 4 event include cis-1,2
dichloroethene, methyl tert-butyl ether (MTBE), trichloroethene, and tetrachloroethene.
As summarized in the Draft Data Evaluation, and the Draft Data Evaluation Addendum the
analytical results for Rounds 1, 2, and 3 also indicated a few incidences of positive detects of
VOCs at low levels, at or near instrument detection limits, with no exceedances of benchmark
criteria. The detected VOCs in Rounds 1, 2, and 3 were MTBE, bromomethane, 1,1
dichloroethene, 1,1,1-trichloroethane, carbon disulfide, chloroform, cis-1,2-dichloroethene,
trichloroethene, and tetrachloroethene. Samples from all four rounds were analyzed for low
concentration VOCs; however, the sample quantitation limits for many of the compounds are
lower for the Rounds 3 and 4 events than for Rounds 1 and 2.
As stated in the Draft Data Evaluation and in the Draft Data Evaluation Addendum and based
on the four rounds of sampling results, the low levels of VOCs present do not a'ppear to
significantly impact the site's groundwater quality.
SVOCs
No SVOCs were detected in study area monitoring wells during the Round 4 sampling event.
The Draft Data Evaluation for Rounds 1, 2, and 3 also states that no SVOCs were detected in
study area monitoring wells. However, upon further review of the data, it is noted that phenol
was detected (1 J ug/l) below the required quantitation limit, in one well (WC95) during
Round 1.
Pesticides/PCBs
The analytical results for the Round 4 sampling event indicate the detection of three pesticides
at low levels, at or near instrument detection limits. No pesticides were detected at levels
exceeding benchmark criteria. The pesticides detected at low levels during the Round 4 event
include 4,4'-DDT, endrin ketone, and beta-BHC.
During the Round 3 sampling event, dieldrin was detected in well WC91 at a concentration of
0.0104 ug/L. This value exceeds the benchmark criterion of 0.0042 ug/L. The only other
pesticide detection in groundwater was, as stated in the Draft Data Evaluation report, during the
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Round 2 sampling event where beta-BHC was reported in well MW-3S at 0.12 ug/L, exceeding
the benchmark criterion of 0.037 ug/L. These isolated detections of two pesticide compounds
do not appear to significantly impact the groundwater quality at the site. PCBs were not
detected during Round 4, nor were they detected during Rounds 1, 2, and 3.
As stated in the Draft Data Evaluation and in the Draft Data Evaluation Addendum and based
on the four rounds of sampling results, the isolated detection of two pesticides in Rounds 1,2,
and 3 and the low levels of pesticides detected in Round 4 do not appear to significantly impact
the site's groundwater quality.
Metals and Cyanide
As in the Rounds 1, 2, and 3 sampling events, a broad range of elevated levels of metals were
detected in Round 4 groundwater samples collected from monitoring wells within the study
area. Exceedances of benchmark criteria were again noted for iron and manganese during the
Round 4 event. Two Round 4 samples (from wells WC91 and WC93) also exceeded the
benchmark criterion for aluminum; however, aluminum was not detected in the filtered samples
from those wells. As in Round 3, vanadium was detected in well WC93 at a concentration
exceeding the benchmark criteria, but was not detected in the filtered sample.
Analytical results from the Round 4 groundwater samples indicated that low concentrations of
cyanide continue to be detected at the same seven study area wells that had detections during
Rounds 1, 2, and 3 (MW2S, MW2B, MW3S, WC91, WC92, WC93, and WC95). Low level
concentrations of cyanide were detected for the first time in study area well MW2D. Cyanide
concentrations did not exceed the benchmark criterion of 200 ug/L during any round. The
CTDEP surface water protection criterion for cyanide of 52 ug/L, which was exceeded during
Round 1 for wells MW-2S and WC92, was not exceeded during Round 4.
The only MCL that had been exceeded in the previous sampling events (thallium, in two wells
during Round 2) was not exceeded during the Round 4 event. Since thallium and manganese
have been determined to be the two primary contributors to the non-carcinogenic health risk, as
reported in the Human Health Risk Assessment, these metals will be the primary focus of this
discussion.
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Thallium: The evaluation of Round 3 ICP-MS results for thallium (detected once at 0.37 ug/L)
indicated that the risks calculated for Rounds 1 and 2 were likely attributable to false positives
and that actual concentrations are less than 1.0 ug/L. A thallium concentration of 1.0 ug/L
corresponds to a hazard quotient of approximately 0.3, indicating that non-carcinogenic adverse
health effects from thallium would not be anticipated. So it is unlikely that thallium is a concern
at these low concentrations.
Thallium was not detected in samples taken from the study area during Round 4, however,
Round 4 samples were not analyzed for low concentration thallium by ICP-MS. The samples
were analyzed through the contract laboratory program (CLP) by method ILM05.3. The samples
analyzed during Rounds 1, 2, and 3 were analyzed by CLP method ILM04.1. Method ILM05.3
has a higher reporting limit (25 ug/l) than reporting limits obtained in the previous Rounds,
however, since it had been determined that the presence of thallium at the site was because of
false positive results, additional investigations into the presence of thallium was not warranted.
As mentioned section 2.0, in order to meet the screening benchmarks, the data validator
changed the CRQL(U) values to the corresponding MDL values reported by the laboratory. The
non-detected results are presented in the tables as the MDL value with a UJ qualifier to reflect
uncertainty at lower reporting limits.
The reader is referred to the Draft Data Evaluation, Section 3.7.2, for a summary of the
potential for false positives for thallium using the ICP/AES analytical method used solely during
Rounds 1 and 2, and to Attachment A, the EPA OTS Alert regarding potential false positives for
thallium using the ICP/AES instrument as described in the standard analytical method for
drinking water samples.
Manganese: The manganese detections for the Round 4 samples were comparable to
previous sampling rounds with respect to the locations and general concentrations reported
within the study area. The same wells that previously exceeded the benchmark-criterion for
manganese continued to exceed the benchmark criterion in Round 4 samples, including
MW-2S, MW-2D, WC93, and WC96. It is noted that several cross-gradient and upgradient
wells also exceeded the benchmark criterion (WC85, WC97, and MW-1S and MW-1B during
Round 1), but concentrations were generally one order of magnitude lower than concentrations
in study area wells. The four highest concentrations of manganese were reported in four study
area wells, MW-2S, MW-2D, WC93, and WC96 during all four sampling events. However,
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manganese concentrations in nearby wells downgradient of the North End Disposal Area (and
upgradient of the study area) sampled by USGS in 1998, exceeded the concentrations detected
in the study area wells by TtNUS.
As summarized in the Draft Data Evaluation Report, elevated manganese and iron
concentrations may be attributable to regional groundwater conditions, as indicated by elevated
levels in cross-gradient and upgradient wells. It is difficult to determine whether activities at the
study area properties have influenced the levels of manganese and iron associated with onsite
groundwater. It is notable that analytical results for soil sampling, as summarized in the Draft
Data Evaluation, indicated that the onsite soil samples from the sites under investigation, 1 and
15 Nutmeg Valley Road, did not exceed benchmark criteria for manganese.
As discussed in Section 3.7.2 of the Draft Data Evaluation Report, a potential source of the
manganese in the groundwater is landfill leachate from the North End Disposal Area. The
landfill is located upgradient from the study area, and leachate samples collected between April
1997 and January 1998 contained high concentrations of manganese (9,350 - 11,100 ug/L).
Another potential source of manganese in the groundwater is the reductive dissolution of
manganese (III, IV) oxide grain coatings. In suboxic, nitrate-poor environments,
microorganisms can use manganese oxides as electron acceptors during the oxidation of
organic compounds. As electrons are transferred from the organic matter to the oxidized
manganese, the manganese(lll) and (IV) is reduced to manganese(ll) and the manganese
oxides dissolve. The dissolution of manganese oxides not only adds manganese to the
groundwater, it also adds trace elements that were attached to the oxide surfaces.
Manganese(ll) will reoxidize to manganese(lll) or manganese(IV) and precipitate from solution
if it encounters oxidizing conditions. On the other hand, manganese(ll) will remain in solution
and migrate with the groundwater as long as the groundwater remains mildly reducing. The
nitrate and organic carbon contents of the groundwater in the study area are unknown, but the
dissolved oxygen content and Eh of the manganese-rich groundwater samples are generally
low. Therefore, it is possible that manganese from the Disposal Area is impacting wells in the
study area, and the reductive dissolution of manganese oxide grain coatings is exacerbating the
problem.
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2.1.4 Study Area Groundwater Analytical Results - Supply Wells *
Two bedrock supply wells were sampled during the Rounds 1, 2, and 3 events. The businesses
at these locations are now using the public water supply, and samples were not able to be
collected from the supply wells. «n
During Rounds 1, 2, and 3 positive detections were infrequent, and if present, were at lower
levels than the general monitoring well groundwater results for metals. No benchmark criteria *"
were exceeded.
M
3.0 HUMAN HEALTH RISK REVIEW
The objective of the human health risk review was to discuss the findings of the baseline human
heath risk assessment reported in the Draft Final Human Health Risk Assessment (TtNUS, m
February 2002) and reviewed in the Draft Data Evaluation Addendum report (TtNUS, December
2002) in light of the new study area groundwater data collected during May and June 2005 m
(Round 4). In general, results of Round 4 were consistent with previous rounds of sampling.
Since thallium and manganese have been determined to be the two primary contributors to the
non-carcinogenic health risk, as reported in the Human Health Risk Assessment, these
contaminants and any newly identified COPCs will be the primary focus of this discussion. •»
3.1 Additional Contaminants of Potential Concern •to
Analytical results from the May and June 2005 round of study area groundwater sampling were
compared to the Maximum Concentration Limits (MCLs) and Region IX Preliminary
Remediation goals (PRGs) for tap water. The Region IX PRGs for non-carcinogens were
adjusted downward to correspond to a hazard quotient (HQ) of 0.1, rather than 1.0. These were *
the same criteria used to identify contaminants of potential concern (COPCs) in the baseline
risk assessment for Nutmeg Valley (TtNUS, 2002). Three COPCs, which were not previously *
identified as COPCs in the baseline risk assessment, were identified through the comparison of
the Round 3 data to these criteria. No additional COPCs were identified for Round 4. •
As described in the Draft Data Evaluation Addendum report (TtNUS, December 2002), 1,1- „,
dichloroethene (1,1-DCE) had not previously been detected in Rounds 1 and 2, but it was
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detected in one sample at a concentration of 0.1J ug/L in Round 3. This concentration is less
than the MCL, however, it did exceed the 2000 Region IX PRO. In August of 2002, the EPA
withdrew the cancer slope factor on which the Region IX PRG for 1,1-DCE was based, from the
Integrated Risk Information System (IRIS), stating that EPA can no longer support quantitative
cancer risk evaluation of 1,1-DCE. This withdrawal effectively invalidates the 2000 Region IX
PRG for 1,1-DCE. A non-cancer toxicity value is now available for 1,1-DCE and a new Region
IX PRG (2004) based on non-cancer effects of 1,1-DCE of 340 ug/L has been developed.
Since the detected concentration of 1,1-DCE was less than both the adjusted 2004 Region IX
PRG of 34 ug/L and the MCL, a quantitative evaluation is not necessary. 1,1-DCE was not
detected in Round 4.
Dieldrin was detected in the July 2002 round of sampling in one sample at a concentration
exceeding the adjusted Region IX PRG. This concentration (0.01 ug/L) corresponds to a hazard
quotient of approximately 0.25. Dieldrin affects the liver. Since no other COPCs identified in the
baseline risk assessment for Nutmeg Valley affect the liver, the total organ-specific hazard
index for the liver would be less than 1.0, indicating that non-carcinogenic adverse health
effects are not anticipated. Dieldrin was not detected in Round 4.
Vanadium was detected in the July 2002 round of sampling in one sample (well WC93) at a
concentration exceeding the PRG and again in Round 4 at the same location. When these
samples are averaged with the previous samples from the same well, the average for this well
is less than the adjusted Region IX PRG. Since the adjusted Region IX PRG corresponds to a
hazard quotient of 0.1, vanadium concentrations do not represent a concern.
3.2 Thallium
Thallium was identified as a Contaminant of Concern (COC) in the baseline risk assessment for
Nutmeg Valley. These results were based on an analytical methodology (ICP/AES) that has
been shown to produce false positive results above MCLs for thallium (OTS Alert #2,
Appendix A). In addition, the method detection limits for this ICP/AES method is at or above
the MCL for thallium. For these reasons, Round 3 samples were also analyzed by the ICP-MS
method that not only avoids the false positive results, but also allows for lower detection limits.
The results of the ICP-MS method indicated that thallium was present in only one sample at a
concentration less than the MCL and only somewhat higher than the adjusted Region IX PRG.
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The concentration detected by the ICP-MS method corresponds to a HQ of approximately 0.15.
These results indicate that the risks calculated previously were likely attributable to false
positives, and that actual hazard quotients are less than 1.0, indicating that non-carcinogenic
adverse health effects from thallium are not anticipated.
No positive result for thallium were detected in samples taken from the study area during
Round 4, however these samples were not analyzed for thallium by ICP-MS.
3.3 Manganese
Manganese was also identified as a COC in the baseline risk assessment for Nutmeg Valley.
Resampling and analysis for manganese is consistent with past results. A revised maximum
within well average for manganese of 2110 ug/L at well MW2S, slightly exceeding the previous
maximum within well average, corresponds to a hazard quotient of approximately 2.7. The
presence of manganese in upgradient and cross-gradient samples indicate that manganese at
the site is representative of regional conditions. This is discussed in detail in Sections 3.7.2 and
3.7.4 of the Data Evaluation Report (TtNUS, 2002b).
4.0 SUMMARY AND CONCLUSIONS
The groundwater sampling event in May and June 2005 represented the fourth round of
monitoring performed by TtNUS in support of the on-going Remedial Investigation/Feasibility
Study (RI/FS). Round 4 consisted of collecting groundwater samples from previously existing
U. S. Geological Survey (USGS) monitoring wells, and EPA monitoring wells within the
investigation area. The sampling was performed from May 24 through June 2, 2005.
The objectives of the Round 4 sampling event were to conduct additional sampling and analysis
of groundwater to assess whether data support the site being delisted.
As reported in the Human Health Risk Assessment (2002), based on sampling results from
Rounds 1 and 2, thallium and manganese have been determined to be the two primary
contributors to the non-carcinogenic health risk.
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A review of the Round 4 analytical results and comparison of those to results to Round 1
(January 2001), Round 2 (June 2001), and Round 3 (July 2002) were performed. Based on the
concentrations of contaminants detected during Round 4, it does not appear that VOCs,
SVOCs, pesticides or PCBs are significantly impacting groundwater in the study area. Several
metals were detected in study area wells during all four rounds, however only aluminum, iron,
manganese, thallium, and vanadium concentrations exceeded the MCL (or PRG if no MCL is
available) during any of the sampling rounds, and of these metals only manganese and thallium
were identified as contaminants of concern (COCs) in the baseline risk assessment. Although
manganese concentrations were somewhat higher in study area wells than in upgradient or
cross gradient wells, the adjusted Region IX PRG was exceeded in all three areas. This
indicates that manganese concentrations in and around the study area are elevated. This may
be due to landfill leachate from the upgradient, North End Disposal Area, or to regional
groundwater conditions supporting dissolution of manganese oxides.
Thallium concentrations detected in two wells (MW-2D and WC93) during Round 2 were likely
false positive results generated by the analytical instrument ICP/AES. To avoid this instrument
interferences, thallium analysis was also performed by ICP-MS. At well MW-2D thallium was
not detected by either analytical method during Round 3, nor was it detected during Round 4.
At well WC93 thallium was not detected using the standard metals analysis (ICP-AES), but was
detected during Round 3 at 0.37J (below the MCL) using the ICP-MS instrumentation with a
detection limit lower than the MCL for thallium. The concentration detected by the ICP-MS
method corresponds to a hazard quotient of approximately 0.15. These results indicate that the
risks calculated previously were likely attributable to false positives, and that actual hazard
quotients are less than 1.0, indicating that non-carcinogenic adverse health effects from
thallium are not anticipated.
To complement the Human Health Risk Assessment, in this report the analytical results from
Rounds 1 , 2, 3, and 4 were screened against MCLs and 2000 Region IX PRGs for tap water
adjusted to an HQ of 0.1. The results of the Round 3 screening identified 1,1-DCE, dieldrin,
and vanadium as additional COPCs. In light of recent changes to the cancer slope factor for
1,1-DCE on which the 2000 Region IX PRG is based, the concentrations of 1,1-DCE are
compared to an adjusted 2004 Region IX PRG and the MCL. No 1,1-DCE concentrations
exceeded the adjusted 2004 Region IX PRG or the MCL and a quantitative evaluation is not
necessary. For dieldrin, one sample location had a concentration exceeding the adjusted
RI02837D -1 3- Tetra Tech NUS, Inc.
DRAFT
Region IX PRG. Since no other COPCs identified in the baseline risk assessment affect the
liver (as dieldrin does) the total organ-specific hazard index for the liver would be less then 1.0
indicating that non-carcinogenic adverse health effects are not anticipated. Vanadium
concentrations from Rounds 3 and 4, when averaged with the previous samples from the same
well result in a within-well average less than the adjusted Region IX PRG. Since the adjusted
Region IX PRG corresponds to an HQ of 0.1, vanadium concentrations do not represent a
concern.
In summary, based on four rounds of analytical results, there are currently no site-related
contaminants that are significantly impacting groundwater quality and posing risks to human
health and the environment at the Nutmeg Valley Road site.
RI02837D -14- Tetra Tech NUS, Inc.
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FIGURES
Qriidoai Inciudes ©olor sodteg. t& 6-^
Upgradient Monitoring Wells
Study Area Wells (Including supply wells at 1 and 15 Nutmeg Valley Road)
Cross-gradient Monitoring Welte
200 400 Feet Wells Sampled - May and June 2005 FIGURE 1
NUTMEG VALLEY ROAD SITE
NOTES: WOLCOTT. CONNECTICUT It TETRA TECH NUS, INC. 1) PLAN NOT TO BE USED FOR DESIGN 3 ALL LOCATIONS TO BE CONSIDERED APPROXIMATE DRAWN BY: D. A. CHISHOLM DATE: Novwnbw 5, 2002 55 JONBPIN ROAD WILMINGTON, MA 01667 |
CHECKED BY: DRAFT FILE: ..^lutmeg-OWOb.APR {S.'S|658-.'S9«
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