RFQP: Professional Environmental Services for Waun-a-Clean Brownfield Cleanup
| Location: | Wisconsin |
|---|---|
| Posted: | Jan 6, 2026 |
| Due: | Jan 20, 2026 |
| Agency: | Waunakee village |
| Type of Government: | State & Local |
| Category: |
|
| Publication URL: | To access bid details, please log in. |
| Bid Title: |
RFQP: Professional Environmental Services for Waun-a-Clean Brownfield Cleanup
|
| Category: | Community Development |
| Status: | Open |
| Bid Recipient: | Village of Waunakee |
|
Attachment Preview
RECEIVED
".J/1,~ Seymour
Environmental Services, Inc.
JUN 1 3 2016
VILLAGE OF W.
'AUNAKEe
Tel: 608-838-9120
May 31, 2016
Ms. Denise Nettesheim
WDNR-R&R
3911 Fish Hatchery Road
Fitchburg, Wisconsin 53711-5367
RE: Contamination Assessment Update
Summit Credit Union Property - 205 S. Klein Drive
Waunakee, Wisconsin
BRRTS # 02-13-561778
Dear Ms. Nettesheim:
Seymour Environmental Services, Inc. (Seymour) is pleased to present the results of the recent
contamination assessment results. Activities conducted include; installation of additional water-table
monitoring wells, performing 2 rounds of groundwater monitoring, and sub-slab vapor sampling at an
adjacent property.
Contamination at the site is related to a former dry cleaning operation. The dry cleaners operated at the
site from 1992 through June of 2013. The dry cleaning businesses were located in the northern portion of
the building. The dry cleaning equipment was located in a mechanical room in the northwestern portion
of the building.
SUMMARY OF PREVIOUS SITE ASSESSMENT RESULTS
Initial Soil ampling
In December 2013 and May 2014 soil sampling as part of a Phase II was conducted at the site by
METCO, Inc. During the initial investigation shallow soil sampling (--4 feet) was conducted at three
locations slightly outside of the footprint of the building. Analysis of the soil samples showed that high
levels of PCE were present in the shallow soils. The PCE level in the soil at each of the three sampling
locations was between 750-1,000 ug/kg. Since the PCE levels identified in the shallow soil exceeded
WDNR standards 8 additional borings were installed to further assess both the vertical and lateral extent
of the CVOC-impacted soils. During the second round of soil geoprobe sampling the borings were
extended to refusal, typically 18-20 feet deep (on bedrock). Soil samples collected at three horizons;
shallow ~3.5 feet, 10 feet and at refusal were submitted for laboratory analysis ofVOCs. The soil
sampling confirmed that the PCE contamination around the building extends from near the surface to a
depth of approximately 20 feet where the bedrock was encountered. No PCE was identified in the soil
samples collected from four borings located 30 to 40 feet away from the margins of the building.
Sampling locations are shown on Figure 1 and laboratory results from the sampling are summarized in
Table 1.
Ms. Denise N ettesheim
WDNR-R&R
May 31, 2016
Page 2
Supplemental oil am1>li11g and Aualy i
In the fall of2014 Seymour conducted additional soil sampling at the site. The objectives of the soil
sampling were to determine the lateral extent of PeE in shallow soils on adjacent properties, evaluate
whether significant release(s) of PeE have occurred along the sanitary sewer lateral, and determine the
contaminant levels beneath the building in the former chemical handling area. Sampling outside of the
building was conducted using a geoprobe.
On September 29, 2014 four geoprobe borings were installed to a depth of 8 feet around the building.
Two of the borings were installed to the north and west of the building to delimit shallow soil
contamination and two borings were installed on the eastern portion of the site to evaluate potential
release(s) from the sanitary sewer lateral. Soil samples were collected continuously during drilling. The
soil samples were described in the field and screened for organic vapors using a photoionization detector
equipped with a 10.6 eV lamp. Organic vapor levels in the soil samples ranged from 0 to 3.8 parts per
million by volume. Six samples were selected for analysis; two from each of the borings on the west side
of the building and one from the borings along the sanitary sewer lateral. The PeE was detected in
shallow (4 feet below grade) soil samples from the two borings located to the west of the building, GP-14
and GP-15. The PeE concentration present in these samples was 35.6 ug/kg and 152 ug/kg. No PeE was
detected in soil samples collected deeper (8 feet deep) at these borings. The concentrations present in the
shallow samples exceed the WDNR groundwater protection level but do not exceed direct contact hazard
levels. No voes were detected in the soil samples collected along the sewer lateral. Samples in the
borings installed in this area were collected at a depth of 8 feet, below the bottom of the sewer lateral.
A hand-auger boring was installed inside of the building on October 14, 2014. The boring was installed
in the maintenance room where dry cleaning chemicals formerly were filtered (Figure I). A soil sample
collected from 9-16 inches was selected for laboratory analysis for voes. The soil sample contained
PeE at 1,830 ug/kg. The PeE level in the soil sample was greater than all but one of the previously
collected samples and significantly above the WDNR groundwater protection ReL of 4.5 ug/kg. Soil
analytical results are included on Table 1.
MonHoring Well Installation/G roundwater Sampling
On September 29, 2014 three water-table monitoring wells were installed at the site. One of the wells
(MW-I) was located near the northwest comer of the building near the former dry cleaning machinery.
The other two wells were placed along the southern property boundary where lower levels of soil
contamination had been identified. Well locations are shown on Figure 2. The well construction details
and water level data are summarized on Table 2.
On October 10, 2014 initial groundwater monitoring was conducted at the site. Monitoring consisted of
surveying the wells, measurement of water levels, and groundwater sample collection. Water level data
collected during the sampling shows that the water-table at the site is present approximately 20 feet below
grade. Groundwater elevation data indicated that groundwater flow in the water-table aquifer is toward
the north-northwest (Nl 6°W). Groundwater samples collected from the wells were analyzed for voes.
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Ms. Denise Nettesheim
WDNR-R&R
May 31, 2016
Page 3
Analytical data showed that dry cleaning related chemicals were present above the NR140 enforcement
standard (ES) in groundwater across the western half of the site. The most severe contamination was
present in the groundwater northwest of the building (MW-1 ). At this location PCE and trichloroethene
(TCE) levels in the groundwater exceeded the ES and the cis 1, 2 dichloroethene concentration exceeded
the NR140 preventative action limit (PAL). Groundwater samples from the both MW-2 and MW-3
contained PCE above the ES but no other analytes were detected. Groundwater analytical results are
compiled in Table 3 and results of the October 2014 groundwater monitoring are posted on Figure 2.
Vapor Jntru ion Pathway creeuing
On October 14, 2014 two sub-slab vapor probes were installed inside of the building at the site. One of
the probes (SS-1) was installed in the former dry cleaning chemical handling area. The second probe (SS-
2) was installed adjacent to the sanitary sewer lateral outlet from the building. At both of the sub-slab
probes 3 to 4 inches of concrete was present overlying a 1" thick layer of polystyrene foam board.
Sediments beneath the floor were medium-grained washed sand.
Vapor sampling was conducted at the site on October 27, 2014. Prior to collecting the sub-slab samples
vacuum testing was performed to ensure that the sampling lines did not leak and testing was done to look
for leakage around the probe. Organic vapor readings from the subslab probes were 327 vppm (SS-1) and
8.3 vppm (SS-2). After the tightness testing was completed samples were collected using 6-liter Summa
canisters provided by the Wisconsin State Lab of Hygiene. The sub-slab sampling canisters were
equipped with a regulator so that the canister filled over a 30-minute period limiting the flow to
approximately 200 ml/min. The vapor sample was analyzed for CVOCs.
Sampling results showed that vapors beneath the building contain significant levels of PCE, no other
compounds were detected. However, the detection levels for the remaining analytes were elevated. The
PCE concentration in both of the sub-slab sampling probes exceeded the current WDNR sub-slab
screening level for small commercial buildings of 900 vppb. The highest PCE levels were present in the
vapor sample collected near the former dry cleaning chemical handling area. The PCE concentration in
the sub-slab vapors at that location (SS-1) was 120,000 vppb. The PCE level in the sub-slab vapors at the
probe installed near the sewer outlet (SS-2) was much lower (8,900 vppb) but still exceeded the screening
level. Vapor sampling data is summarized in Table 4 and sample locations are shown on Figure 3.
RECENT ASSESSMENT ACTIVITIES
Monitoring Well lnstallation/Groundwater Sampling
On June 10 and 11, 2015 four additional water-table monitoring wells were installed in the right-of-way
of properties surrounding the site. Monitoring wells MW-4 and MW-5 were installed in the calculated
downgradient direction of MW-1. Monitoring well MW-6 was installed in a side gradient direction.
Monitoring well MW-7 was installed south ofMW-3 and up gradient of the source. Well locations are
shown on Figure 4.
,.. Uy•. ".J I KO<Jfl rI 0 B x ~9.. Mt;F• dant1 11 ,· 1%
Ms. Denise Nettesheim
WDNR-R&R
May 31, 2016
Page 4
Initial groundwater monitoring for the new well network was conducted on June 26, 2015. During that
event water level and groundwater samples were collected and the well locations and top of casing
elevations were surveyed. Water level data was contoured to construct a water-table contour map (Figure
4). The data indicate that shallow groundwater flow at the site was toward the north-northeast (N26°E).
The horizontal hydraulic gradient was 0.0074 ft/ft. Analytical data confirms that high levels ofevoes
are present in the groundwater on site. The most severe contamination was present at MW-1, which is
located near the northwest comer of the property close to the former dry cleaning area. Groundwater
from this well contained PeE (3,860 ug/I) and TeE (38.4 ug/I) above the NR140 ESs. Additionally, cis
1, 2 DeE was present at this well. Groundwater at the other two wells on site also contained PeE above
the NR140 ES. The PeE level near the southwest comer of the property (MW-2) was 38.3 ug/I and the
PeE level along the south-central portion of the property (MW-3) was 101 ug/I. Low levels of PeE were
identified in one of the monitoring wells installed off site, MW-4 which is located along William Way
-110 feet immediately north of the site. The groundwater sample from MW-4 contained PeE at 0.70
ug/I. No voes were identified in the groundwater samples collected from three monitoring wells; MW-6
(west), MW-5 (northwest), and MW- 7 (southeast). Well construction and water level data is compiled in
Table 2 and groundwater analytical data is summarized in Table 3.
A second round of groundwater monitoring was conducted on February 25, 2016. Water level data from
February 2016 generally was consistent with data from June 2015. The data indicate that shallow
groundwater flow was again north-northeast (N22°E) and the hydraulic gradient is 0.0062 ft/ft (Figure 5).
Analytical data were similar to previously collected information. Groundwater from each of the onsite
monitoring wells contained PeE above the NR140 ES. Additionally, groundwater from near the
northwest comer of the property (MW-1) contained TCE above the ES. PeE levels present at MW-1 and
MW-2 were lower than previously measured. The PeE concentration at MW-3 (along the southern
property line) was similar to the earlier measured values. Again, only one voe was detected in an offsite
well. The groundwater in MW-4 had PeE at 0.67 ug/I in the groundwater directly north of the site along
William Way (MW-4). No voes were detected in the remaining off site wells.
Vapor Mitigation S stem Installation
Seymour attempted to contact the neighbors on either side along Klein Street, Phillip Willems at 209
South Klein and Scott Podboy at 201 South Klein. We also contacted both owners of a duplex house at
504 and 506 William Way. The owners of 506 William Way, Jesse and Jason Dresen already had a radon
mitigation system so we chose not to sample their property. Scott Podboy declined to give us permission
to conduct sampling at his property. The owners of 504 William Way did not respond to our letters or
return our phone calls. Phillip Willems did not respond to our request until he had an offer on his
building and a Phase I recommended sub-slab sampling.
In January 2016 a vapor mitigation system was installed in the building on the subject parcel. Installation
of the system was performed by Zander Solutions of Verona, Wisconsin. The mitigation system consists
of three pickup points extending through the slab and a single exhaust blower. The system is designed to
induce a low negative pressure beneath the floor slab to reduce intrusion of vapors into in the building.
The vapor mitigation system layout is shown on Figure 6. The exhaust fan is located immediately above
the drop point in the former solvent filtering room (YM-1).
n R:Jr.O I
.. 1')
Ms. Denise Nettesheim
WDNR-R&R
May 31, 2016
Page 5
After construction of the system was completed monitoring was performed to evaluate the effectiveness
of the system. Monitoring conducted on February 25, 2016 showed that the mitigation system applies a
vacuum of between 1.4 and 1.6 inches of water at each of the three drop points. Low vacuums (-3/4 inch
water) were measured at the sub-slab probes indicating that the system maintains negative pressure
beneath the slab. Organic vapor measurements were collected at the drop points and the sub-slab probes
using a photoionization detector equipped with a 10.6 eV lamp. The organic vapor levels in the discharge
stream ranged from 0 vppm in the drop point along the north wall (VM-3) to 17.2 vppm at the drop point
located in the former solvent filtering room (VM-1). No organic vapors were detected during screening
of vapor samples from the sub-slab probes. For reference, prior to installation of the mitigation system,
organic vapor levels in these probes were 327 vppm (SS-1) and 8.3 vppm (SS-2). Based on the initial
data it appears that the mitigation system has removed hazardous levels of vapors from directly beneath
the floor slab and by capturing the CVOC vapors. Based on the PID reading from February 2015 and
mitigation system flow data we estimate that -0.85 lb/day of CVOC vapors were being extracted from the
ground beneath the building.
Vapor Intrusion Pathway Screening
On April 12, 2016 three sub-slab vapor probes were installed inside of the building immediately south of
the site (Willems). Two of the probes (SS-1 and SS-2) were installed along the northern side of the
building nearest to the known contamination. The third probe (SS-3) was installed in the central portion
of the building. At each of the subslab probes 3 to 4 inches of concrete was present overlying a 3/4" thick
layer of polystyrene foam board. Sediments beneath the floor were well-graded sand.
Vapor sampling was conducted at the Willems property on April 25, 2016. The vapor samples were
collected using 6-liter Summa canisters provided by the Wisconsin State Lab of Hygiene. The sub-slab
sampling canisters were equipped with a regulator so that the canister filled over a 30-minute period
limiting the flow to approximately 200 ml/min. The vapor sample was analyzed for CVOCs.
Vapor sampling results indicate that low levels of CVOC vapors are present beneath the building. The
only compound detected in the sub-slab vapor samples was PCE. Similar PCE concentrations were
present in both of the sub-slab sampling probes located along the northern wall of the building. The
sampling points contained 19 ppbv (SS-1) and 28 ppbv (SS-2). These levels are below the WDNR sub-
slab screening level for small commercial buildings of900 ppbv. Lower PCE levels were detected in the
sub-slab vapors beneath the central portion of the building. In this area (SS-3) PCE was present at 4.2
ppbv. Vapor sampling data is summarized in Table 4 and sample locations are shown on Figure 7.
DISCUSSION OF RESULTS
Data collected at the site confirms that a release of dry-cleaning related chemicals has occurred at the site.
The distribution of the identified contamination indicates that the primary release area is located near the
northwest side of the building. Groundwater contamination associated with the release extends across the
majority of the subject parcel. No CVOCs have been identified in the groundwater to the west, northwest
and southeast of the site. However, groundwater level data indicates that flow in the water table aquifer is
toward the north-northeast. No monitoring wells are present in that direction.
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