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Site Investigation Workplan, dated July 29, 2022
PSI completed the case closure documentation and it was submitted to the WDNR in
November/December 2016. It has been reviewed by the WDNR and they requested
additional information and changes to the submittal. PSI prepared these changes and
resubmitted them in August 2017. Additional information for off-site retraction letters
was submitted in December 2017. PSI prepared additional information to substantiate the
request to retract the offsite notification letter to the UPRR property to the west. In
addition and as requested by the WDNR, PSI prepared a summary letter of a comparsion of
PSI's chromium test results vs Hygienetics' chromium test results and test locations in
relationship to the western adjoining railroad line and submitted it to the WDNR. PSI
prepared a proposal to perform additional site investigation activities on this parcel
January 7, 2020. Additional groundwater monitoring well was installed on January 25,
2021 and collected soil and groundwater samples analyzed for the presence of Chromium,
Hexa Chromium and Tri Chromium and Cyanide. Based upon the review of the laboratory
test results and field collected data, there is no evidence that indicates the presence of
Total Chromium, Hexavalent Chromium, Trivalent Chromium, or Cyanide at high levels
within the soils collected from PSIâs SB-15a, which was placed in the general area around
the former Hygieneticsâ SB-15. The soil test results indicated no detected levels above the
laboratory LODs for Hexavalent Chromium and Cyanide and levels of Total Chromium and
Trivalent Chromium were well below the WDNR NR720 BTV for Chromium. In addition, the
groundwater test results indicated no detected levels of dissolved Chromium, Hexavalent
Chromium, Trivalent Chromium, or Cyanide above their respective laboratory LODs. PSI
also evaluated for emerging contaminants. Walmart has given approval to evaluate for
the presence of PFASs within the groundwater associated with the existing wells. These
sampling activities were completed in August 2022. Additional groundwater sampling for
the presence of PFASs was proposed and will be performed following client approval.
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