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(digging) in this depressed area a three-foot diameter man hole access-way was <br /> uncovered Further investigation identified a 2-inch diameter UST vent pipe that was <br /> located approximately seven feet east of the man hole access-way. The man hole access- <br /> way for UST "A" was lifted for observation. The access-way "collar" is constructed of <br /> brick and the UST appears to be filled with sand to a pleasured depth of three feet bgs <br /> Field observations did not identify tank construction material The orientation of UST <br /> "A" is nearly identical to that of UST "B", concurring with the PHS/EHD drawing UST <br /> locations and work area utilities were marked, labeled, and measured (Figure 2) Figure <br /> 3 is Cross Section A-A' and Figure 4 is Cross Section B-B', both figures identify <br /> subsurface profiles of the work area. <br /> As stated above, UST "A" was not identified using geophysical techniques, this may be <br /> due in part to the following reasons: 1) no fill port was accessed for electromagnetic <br /> detection methods, 2) that excessive moisture at the surface (turf grass) may have <br /> impeded GPR penetration, and 3) the tank was filled with sand or grout material, <br /> therefore subsurface density variations may not have been great enough to form a tank <br /> "foot-print" using the GPR technique <br /> 22 Drilling Activities <br /> Boring locations were chosen based on accessibility and proximity to the UST's <br /> Accessibility to alternate boring locations was limited by surface and subsurface <br /> K084023 RPT 7 <br />