Wood Hollow MRS
Initially, the Wood Hollow MRS was a much smaller site (78 acres). The MRS was expanded based on the results of successive investigations. In 2011, a time-critical removal action (TCRA) was performed to remove surface and subsurface munitions over 31 acres of the site where a mining haul road was planned. Findings of the TCRA were consistent with results of the RI, showing the site contained remnant 75mm and 37mm projectiles and MD at the shallow surface level. For this reason, the remedial action (RA) required for Wood Hollow included a surface and subsurface munitions and explosives of concern (MEC)/MD removal action that was completed in 2017. The MRS is partially covered in dense thickets of oak brush. In order to conduct geophysical investigations for subsurface MEC/MD removal, approximately 74 acres of oak brush was cut from the Wood Hollow MRS.
Transect investigations were conducted in unremediated areas outside of the Wood Hollow MRS. Data collected along transects was used to verify that the extent of the Wood Hollow MRS was adequately defined and to confirm that risk-based thresholds established under the statistical approach for areas adjacent to the MRS were not exceeded. No MEC was found outside the Wood Hollow MRS, and only scattered limited MD was found outside the MRS. The entire study area encompassing the Wood Hollow MRS and the adjacent area of transect investigation was designated as the Wood Hollow Munitions Response Area (MRA). At the conclusion of the RA, the area of transect investigation outside the original Wood Hollow MRS was subdivided into two additional MRSs: the Central Area MRS, where only scattered MD was found and a low density of artillery-related MD is anticipated based on Visual Sample Plan (VSP) modeling; and the outlying Western Area MRS, where no artillery-related MD was found.
For additional information and reports of previous investigations, please visit the Repository