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Technical Memorandum on Surface Geophysical Surveys, High Priority SWMUs
Section 3 - SWMU B-8
3.1 - Site History and Description
SWMU B-8 is located in the north pasture 300 feet north of the CSSA inner cantonment boundary and 500 feet northeast of CSSA monitoring well 16 (Figure 1.1). Along the eastern edge of the site lies a gravel road and a circular burn area for cedar. An overhead utility line trends northeast-southwest across the southern portion of the site (Figure 3.1). B-8 was included as part of this investigation due to its proximity to well 16. Other than a few mounds and ridges trending east-west, there is no evidence of subsurface disturbance at the site. There are a few scattered fire bricks lying on the surface on the northern portion of the site. Because of fire bricks and spent shells on the ground, the initial field survey indicated this site was used to fire small arms ammunition.
3.2 - Geophysical Survey Results
An EM survey was performed at B-8 along north-south transects spaced at 25-foot intervals. The EM conductivity and in-phase contour maps are shown on Figure 3.2 and Figure 3.3 An EM anomaly was detected in the southwestern portion of the site. However, this anomaly is associated with an abandoned underground 4-inch diameter pipe trending northeast-southwest (Figure 3.1). This metal pipe continues southwest of the site toward well 16. The pipe is broken and exposed in certain places outside the surveyed area.
An isolated anomaly exists on the eastern portion of the site at the burn area (Figure 3.2). This anomaly, identified as A on Figure 3.4, is more pronounced on the in-phase contour map, and therefore, may be associated with buried metal debris. There was no metal debris at the burn area's ground surface that may have caused electromagnetic interference. Therefore, results indicate one geophysical anomaly at B-8 that is possibly related to past waste management activities.