Käyttäjä:VigilBartholomew557

The drilling subcontractor was Vironex, Inc., of Bowie, Maryland. The soil borings were drilled by the direct push technology (DPT, or “Geoprobe”) drilling technique. With the DPT methodology, a sampling barrel fitted with a 2-inch-diameter by 4-foot-long acetate core sleeve is hydraulically advanced (or pushed) into the subsurface to obtain a soil core. The barrel is withdrawn from the borehole, the acetate core sleeve is removed, a new core sleeve is inserted into the barrel, and also the sampling assembly is reinserted into the borehole to get the next core. The borehole stayed open when the sampling assembly was withdrawn attributable to the clayey and silty nature of the soil. At every location, continuous soil samples or cores were collected from the bottom surface to the top of bedrock (which was defined as hydraulic refusal, or the inability to further advance the barrel). The depths of the 2 borings were ten feet (01SB51) and eleven feet (01SB52). At the conclusion of every boring, the borehole was backfilled with a mixture of soil cuttings and bentonite. The soil boring were surveyed for horizontal location and vertical elevation by James M. Stewart, Inc. Their survey knowledge are presented in Appendix A.