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' GEOMATRIX <br /> table, soil grain size, and estimated permeability) and type of subsurface exploration method <br /> ' employed. If required, permits for drilling soil borings will be acquired from the appropriate <br /> agency(s) before the drilling is initiated. An underground utility check will, at a minimum, <br /> ' consist of contacting a local utility alert service, if available. <br /> ' 2.1 ENVIRO PROBE' <br /> The Enviro Probe' consists of a stainless steel drive point with a retractable outer sleeve, a <br /> ' stainless steel, wire-cloth filter, various viton rubber 0-rings, and a flexible viton rubber seal <br /> (septum) at the upper end of the probe, as shown on the figure BAT ENVIRO PROBE' <br /> ' SCHEMATIC. The rubber septum provides a watertight seal that prevents water from readily <br /> entering or exiting the top of the probe. The filter is attached to the inside body of the probe <br /> and is protected by the retractable outer sleeve. The sample reservoir is part of a separate <br /> assembly, as discussed in Section 3.1. The tool can be disassembled readily for cleaning <br /> ' between sampling events. <br /> ' 2.2 HYDROPUNCH' <br /> ' The HydroPunch' consists of a drive point, a stainless steel screen section, a sample reservoir <br /> integral with the tool body, and assorted 0-rings and check valves to create watertight seals <br /> ' between the various components. Two models of the HydroPunch' have been developed, <br /> having slightly different designs and/or component parts as shown on the attached <br /> ' HydroPunch' I and II Schematics. All components are made of stainless steel, Teflon, or <br /> other relatively inert materials. The tool can be disassembled easily for cleaning between <br /> sampling events. <br /> ' 3.0 SAMPLING METHODS <br /> Installation of the Enviro Probe' and HydroPunch' generally follows the same methods. A <br /> target sample interval (target zone) is usually identified prior to collecting a sample. When <br /> sampling while using conventional drilling methods, the soil boring is advanced to a depth <br /> ' immediately above the target zone prior to installing the sampling tool. The sampling tool is <br /> DISCRETE-DEPTH SAMPLING Page 2 of 6 <br /> ' MSOPROTO-DS.= REVISION DATE:MARCH 19% DS-2 <br />