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WATER GREMLIN .PUBLIC HEALTH ASSESSMENT: PUBLIC COMMENT DRAFT <br />In November 2018, select Smog Wog control devices were tested for lead and particulate emissions to <br />determine how well they were able to prevent contaminants from being released to the outdoor air. <br />Results of the testing indicated that the averaged emissions were: well under regulatory. limits. for <br />particulates enforced byhe.current air permit (Pace, 2019): Airborne lead results were not compared to <br />any regulatory Iimit'because. the facility was not subject to any such standard at the time, The MPCA is <br />currently drafting a new air permit far the facility in which the 2018 test results have: been evaluated <br />and utilized.as part of the emission characterization for the. facility. <br />Monitoring for lead in outdoor air.arourid the Water Gremlin facility began ih September 2019 to help <br />answer questions about. .possible lead ex from'the community, and ended in January 2022. <br />Sampling occurred every six. days. and results were. posted on the MPCA website at:Water Gremlin air <br />monitoring(.www.pca,state.mn.us/air/water-gremlin-air_monitoring). Results were compared to the <br />National Ambient Air Quality 5ta:rid ard .of 0.15 µg/m3 set by the. U.S. EPA to provide public health <br />protection. Monitoring resuIts .indicate lea d.ernissions have remained well below the EPA standard at <br />the sample locations since this testing began. <br />It.is expected that alrborne read emissions deposit to the ground near Water Gremlin's facility, Section <br />V. B provides more inforrhation on lead in soil.. <br />III, Remedial Investigation Data and Interpretation <br />The Stipulation Agreement for violations of the air quality permit required Water Gremlin to perform a <br />remedial investigation that Included sampling groundwater, surface water, soil, sediment, soil vapor, <br />and. private wells on and near their property {MPCA, 2019a). The purpose was to determine where and <br />how much contamination was present (Le.., to define the extent and magnitude of contamination) that <br />may have been caused by Water Grem lin's activities at their property over the yea..rs.. A Phase I <br />Environmental Site Assessment was`compieted in April 2019 to help identify potential areas of <br />contamination.and help select initial sampling locations. The investigation began. in June 2019 and <br />samples were analyzed for lead and volatile organic compounds (VOCs), including TCE and t-DCE. Results <br />were submitted to MPCA in a report at the end of July 2019 (Wenck, 2019), Additional data was <br />collected as part of subsequent sampling events needed todefine the -extent. and magnitude of <br />contamination in all environmental media (see Table 7 below). The remedial investigation i5 ongoing as <br />of April 2022. <br />Table: 7: Remedial Investigation Activities 2019-present <br />. {_. .r•<:==kr-�. {': _.•�r''^�-'s';`•''=i-r='S- <br />r.r _fir i_, j:� 5,7lr _ y- F <br />E:�,.��.:,•'.:.�.::.- <?.>�.•E":.v.:3 _fir.-.a�;a--<.y:7-.'a;:7*r-i s;^ x<- ..-.nr� E,.,-• <br />a tlo� ; <br />.;zy - k .k 3': _ <br />- stJ„" -' <br />:.L=r^ S•d:`F .;YF ,.:(;: �-,.Z ,`^4� �-•,�e.Lw,�' 3:.. 3'. <br />June:2019 <br />Groundwater, surface water,. soil, sediment,%and:soiI vapor (Wenck; 2019) <br />Aug 2019 <br />Sub -slab. vapor at the Water Gremlin building,.soil vapor to edge of Water Gremlin 7 <br />property, groundwater (Wenck; 2020) <br />Sept 2019 <br />Sub -slab, indoor, and outdoor air at the Water Gremlin building (We.nck, 202.0) <br />oct 2019. <br />Sub=slab, indoor air, groundwater and soil. within coating room footprint, additional __ 3 <br />sub slab and indoor air in Water.Gremlin building; roof runoff water from Water <br />Gremlin building downspouts; sediment and surface water; additional.scil vapor t <br />(Wen.ck, 2020) i <br />Dec 2019 <br />Soil vapor, soil, groundwater, and sub -slab vapor (Wenck,.2020) <br />Jan 2020 <br />Soil vapor Menck, 2020) <br />21 <br />