| Comments: |
Former Skeet Range #1 and Trap Range #1/#2 (TS509): Soil samples were collected from six locations within TS509 to delineate locations of previous samples exceeding Wisconsin RCLs. TS509 soil samples were analyzed for PAHs by USEPA Method SW8270C SIM. PAHs were detected in each sample; however, none of the concentrations exceeded Wisconsin RCLs for non-industrial soil, industrial soil, or protection of groundwater. These results provide additional information to delineate locations of previous exceedances.
A portion of TS509 overlaps the MSA, and data collected during the MEC investigation for the MSA is therefore applicable for TS509. Specifically, one MEC item (fuzed 3-inch Stokes mortar) was found during the intrusive investigation of grid K12 overlapping TS509. The MEC HA and MRSPP were subsequently updated with the data collected during the RI addendum field activities. The MHAT resulted in an updated hazard level for current and future use of 3, which corresponds to a moderate hazard potential. The MRSPP priority for TS509 is 3.
The HHRA was updated using the PAH analytical data collected in 2017. The cumulative carcinogenic risk for TS509 is 2Ã10-6 for the residential scenario. This value is below WDNRâs target cancer risk of 5Ã10-6 for cumulative cPAHs for the residential scenario and at the lower end of the USEPA risk management range of 1Ã10-6 to 1Ã10-4. The cumulative carcinogenic risk for the industrial scenario is 1Ã10-7. This value is less than WDNRâs target cancer risk of 1Ã10-5 for the industrial scenario and is below the USEPA risk management range of 1Ã10-6 to 1Ã10-4. Therefore, no unacceptable risks are anticipated due to PAHs in TS509 soil. In addition, the conclusions of the ERA (Bay West, 2015) are unchanged, and little or no population risk to wildlife is expected based on the MC concentrations
Recommendation: Future military munitions response is recommended for the area overlapping the MSA, and alternatives would be evaluated in the recommended FS for the MSA.
|
