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Technical Memorandum on Surface Geophysical Surveys, Well 16 Source Characterization
Section 10 - Southeast Well 16
10.1 - Site History and Description
Southeast Well 16 (SE Well 16) is located southeast of Well 16 on the south side of the paved road mentioned above (Figure 1.1). Previous CSSA employees indicated that mustard gas canisters might be buried. However, there was no visible surface evidence of such burial. Approximately half of the SE Well 16 is covered with dense vegetation which could not be surveyed with the geophysical equipment used. The site is bounded to the north and west by the paved road and B-3 lies to the southeast. There is a small drainage ditch oriented north-south along which exposed metal piping was observed. This underground piping trends northwest-southeast and originates at the B-3 site where it is above ground. Also present at SE Well 16 is a small fiberglass box, a telephone pole, and an area of reinforced concrete rubble (Figure 10.1).
10.2 - Geophysical Survey Results
Figure 10.2 and Figure 10.3 depict contour maps of apparent conductivity and in-phase EM data, respectively, for the north-south EM transects at southeast Well 16. EM readings were taken along north-south transects separated by 25 feet. Dense vegetation in the area prevented full coverage of the EM survey at Southeast Well 16. One strong anomaly is observed at the north end of the site with conductivity values greater than 150 mS/m. This anomaly trends northwest-southeast and is associated with a buried 4-inch metal pipe which originates at SWMU B-3 to the southeast. The metal pipe is exposed at Southeast Well 16 in the small drainage ditch shown on Figure 10.1. Two other anomalies were detected at Southeast Well 16, one associated with the telephone pole in the northwest and one associated with the pile of reinforced concrete rubble in the west-central part of the site. Similar to Well 16, the only EM anomalies detected at Southeast Well 16 were associated with cultural features.
A GPR survey was also performed using the GSSI SIR-3 system. The GPR survey was conducted at 50-foot intervals in the north-south orientation. No anomalies were detected except for a small hyperbolic signal in response to the underground metal pipe mentioned above.