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11 activities and observations The Umfied Soils Classification System (USCS) was used to log ' lithologies ' 4.2.2 Simultaneous Soil and Groundwater Sampling Commencing at the depth at which groundwater was encountered (approximately 30 feet bgs), groundwater samples were collected at ten foot intervals using a Sumulprobe ' sampling device The Si mulprobe m (Figure 4-1) is an nn-situ sampling device, shaped much like a split spoon sampler, which allows the simultaneous collection of in-situ hgwd with soil ' core The purpose of the SnmulprobeTM is to collect soil samples and liquid samples at the same depth interval The paired samples can be simultaneously and economically collected in ' one sampling event This paired samphng technique provides the opportunity to investigate ' 1 the relationship between contaminant distribution and stratigraphic characteristics, and, y2 the opportunity to compare contaminant concentration in liquid with that found in ' directly correlative soil core 4.2.3 Simul robe Sampling Prior to each sampling event, the Simulprob6m was steamcleaned and new consumables (i a Teflon tubing, o-rungs, brass tubes, etc) were used To minimize the ' potential of water entrained within the augers from entering the Si mulprob6m while it is lowered to its proposed sampling depth, the SimulprobeTM was pressurized with nitrogen gas ' A latex condom was rolled on from the shoe along the bottom half of the probe to prevent cross-contammatirng sequential soil samples Once the sampling depth was reached, the ' SunulprobeTm was driven approximately 18-21 inches into the subsurface by the drill-ng hammer to collect the soil.core The Sunulprob6m was then pulled back approximately 2 to 3 inches to retract the sliding Drive Shoe and expose the Circular Screen (Figure 4-1) The nitrogen gas was then allowed to bleed offto the atmosphere at ground surface which allowed