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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 /> i <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 O- 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 HYDROPUNCIr <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 HydroPunW have been developed, II <br /> havin slightly different designs and/or component arts as shown on the attached J <br /> g � y � P P , . � <br /> HydroPunch* I and H 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 /> MSCIPROTO-DS.= REVISION DATE:MARCH 19% DS-2 <br />