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Technical Memorandum on Surface Geophysical Surveys, High Priority SWMUs
Section 5 - SWMU B-12
5.1 - Site History and Description
SWMU B-12 is located west of SWMU B-16 and behind the previous F-14 storage area (Figure 1.1). This low-lying ponded area is surrounded by a 15- to 25-foot embankment to the west, an elevated dirt road to the east, and trees to the north and south (Figure 5.1). The trees to the north and south are standing on higher ground. Due to the surrounding elevated terrain, water readily accumulates in the central part of the site, especially after a heavy rain. During this survey, standing water reached a maximum depth of approximately 2 feet in the southeastern portion of the site. Another feature of B-12 includes limestone outcrops at two locations. Furthermore, the tall embankment to the west contains abundant small and large metal debris, clay pipe fragments, and limestone boulders on the surface. This debris appears to have been disposed of on the slope of the embankment. According to historical records, large pieces of scrap metal and weapons were embedded into the hillside and adjacent ponded area. However, there is no evidence of subsurface disturbance in the ponded area.
5.2 - Geophysical Survey Results
An EM survey was performed at B-12 along north-south and east-west transects. The transects were spaced at 25-foot intervals. The EM conductivity and in-phase contour maps are shown on Figure 5.2, Figure 5.3, Figure 5.4, and Figure 5.5. The results show that no EM anomalies were detected at B-12. Therefore, there is no indication of subsurface disturbance in the surveyed area, and thus no geophysical anomalies were found. The adjacent hillside area containing abundant metal debris was not surveyed due to surface interference.