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WATER GREMLIN PUBLIC HEALTH ASSESSMENT: PUBLIC COMMENT DRAFT Figure 7: Lead in Soil Sampling Results In June/July 2020, to -conclude the soil investigation,:18 soil samples were collected for analysis of VOCs .and 1A-dioxa6e`(Wehck, 2021). There wet6 no detections of VOCs or 1,4-diQxane in any of these samples.* 1'hree-samples collected in the upper foot of soils near the South Cafnpus building were analyzed&r lead -concentrations were at -natural background levels (5.7417.8 ppm). Lead is naturally :found lh*soll aV;0ound.15-20 ppm (ATSDR,*2Q19). to suinrriar�,--lead:in soil is above Industrial SRVs beneath the Water Gremlin main building and in four soli samples in the top foot of soil outsidethe.5outheast portion of the building,.Qnly.trace levels of VOCs-were detected in three soil samples.1,4-dibxahe was not detected in soil.. Lead is a very common soil gontaminant.due to Its widespread historical use in gasoline and paints. To provide some context for the concentrations found. at Water Gremlin, elevated lead in soil (in the hundreds of ppm) is often found near historically busy roadways from gasoline and near buildings or fences where lead -based paints may have chipped off. Lead does not degrade. It strongly adsorbs to soil, so very little Is expected to be` transpoited1hroygh runoffto surface water or leached to groundwater (ATSDR, 201.9). The soil on the WaterGrenilln property is remarkably low in lead given that the facility has been using lead for decades, although lead -contaminated soil was previously excavated.from.the property (see. section G. below) and numerous construction activities have occurred atthe site: The areas of soil contamination at Water Gremlin have been defined and are limited: toAheirown property. Given the low 27