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Technical Memorandum on Surface Geophysical Surveys, High Priority SWMUs
Section 4 - SWMU B-11
4.1 - Site History and Description
SWMU B-11 is located southeast of monitoring wells 2, 3, and 4 (Figure 1.1). The site is bounded to the north by Salado Creek, to the east by Moyer Road, and to the south by a fence line and plowed field. The most characteristic feature of the site is an east-west oriented ditch closed on its western end. The central part of the ditch contained standing water at the time of the survey. There are scattered trees and isolated metal debris on the surface in areas (Figure 4.1). On the western end of the site lies a large pile of miscellaneous trash, including cedar stumps, concrete rubble, wooden posts, limestone fragments, asphalt, and abundant metal debris. According to historical records, B-11 was used for disposal of ammunition, scrap metal, and construction debris. The initial field survey indicated the presence of miscellaneous ammunition boxes, arms packing craters, and construction debris.
4.2 - Geophysical Survey Results
An EM survey was performed at B-11 along north-south transects spaced at 25-foot intervals. The EM conductivity and in-phase contour maps are shown on Figure 4.2 and Figure 4.3. There were two anomalies identified at B-11 in the southeastern portion of the site. These anomalies were caused by cultural disturbances, namely the proximity of the fenceline to certain transects in that area. No other EM anomalies were observed at B-11. Therefore, the geophysical survey results do not indicate the presence of subsurface anomalies potentially related to past waste management activities.