2022 05-17 CC PACKET - Laserfiche WebLink

Home

WATER GREMLIN PUBLIC HEALTH ASSESSMENT; PUBLIC COMMENT DRAFT r For niore.!nformation on thegroundwater in deeper aquifers used for drinking water, see section VI. (. Drinking Water, below. Flilweff The soils nearest the Water Gremlin facility contain fill materials from construction projects over time. Lead contaminated soii..south east. of the facility was removed from the property in 1995.1995 (see section. G..). Land.to the east andsouth of the facility are. wetland areas. Soil sample results from the Water Gremlin property are compared to:the MPCA'.s Industrial Soil Reference Values (SRVS..). SRVs are a. screening tool that may be used to evaluate potential human health. risks from. direct exposure to contaminated soil based on a specific land use category (MPCA, 2021). SRVs.are presented in parts per million (ppm) , which is the same as milligrams per kilogram (mg/kg). In June 2019, a total of 54 soil samples were collected at various depths at 25 locations surrounding: the Water Gremlin facility and.artialyzed for lead and VOCs (Wenck, 2019b). Lead in soil exceeded the. Industrial SRV of 7.00 pp in four (719-982 ppm) of 3.0 samples analyzed. for lead (Wenck, 2019b). These four samples..were all located in the top foot of soil near the. southeast portion of the Water Gremlin facility (see Figurie 7). No VM were detected in soil samples With a single exception of trace. arnounts of TCE and tetrachloroethylene (PCE) in on.e location at.a depth of 274 feet where a.lead exceedance was also found. In October 2019, sail samples were collected from two depths in seven locations under the: coating room floor (Wenck, 2.020) to investigate potential contamination suspected beneath:a portion of the Water Gremlin building. Samples at the seven locations 6-8 feet below the floor were analyzed for V.00s and none were detected. Lead was analyzed for in samples up to one foot deep under the floor and. ranged from 17.3-13,600 ppm. Three of these samples were above the Industrial 5RV for lead. The sample With the highest.lead result was also analyzed. for VOCs at the 0-1 foot.depth and. con tained.t-17CE and TCE (0.11-0.12 ppm.) at concentrations Well below the SRVs for these chemicals. In December 2019, additional soil samples were collected from. multiple depths at 10 interior locations and 11 exterior locations (Wenck, 2D20), The interior samples were taken beneath the facility floor at locations outside of the coating -rooms such as the gravity cast.room, shipping and receiving, main die cast area, and cold forming area: to see if there was evidence of any past release from use or storage. of lead and: VOCs in these areas. The exterior samples were placed onth6 northern perimeter of the property and to the south, .east and west of the June soil samples to define the extent of contamination (see Figure. 7). For lead at the interior.locations, only one of ten:sampies at a depth of 0-1 feet exceeded the Industrial 5RV at 1,060. porn. None of the 13 samples at the 11 exterior soil locations contained lead. .above the Indust:rial:SRV. Fourteen interiorsa.mpies were also analyzed for VOCs and none Were detected. Only 1 of 15 exterior samples detected VOCs - low levels.of ethyl benzene, toluene, and p- isopropyltoluene. MW