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L' "hydrocarbon mode," the sample is collected by lowering a narrow diameter bailer through 5 the drive rod (minimum 1-inch-diameter) and bailing out the volume of groundwater required Cfor analysis. The screen and drive point are left in the hole as'the HydroPdnch®II tool is removed. When the sample is retrieved to the surface, it decanted into laboratory-prepared sample containers suitable for the analysis desired. The HydroPunch° is then disassembled for decontamination and preparation for subsequent sampling depths. The HydroPunce I can be continued in the same borehole to the next desired sampling depth. 4.0 EQUIPMENT DECONTAMINATION The Enviro Probe and HydroPunchm are cleaned by complete disassembly, including 0-rings and/or check valves, followed by a laboratory-grade detergent and potable water wash and then followed by a deionized-water rinse. All decontamination rinsate will be collected and stored properly for future disposal by the client, unless other arrangements have been made. The condition of 0-rings should be checked during each cleaning and replaced as necessary. The screen should be discarded after each use. The t6oi will be assembled after cleaning, following the instructions provided in the appropriate sampling kits. 5.0 EQUIPMENT CONSTRAINTS The Enviro Probe and its associated GMS assembly require drive rods of a minimum 1-inch inside diameter. HydroPunchm I and HydroPunch� II (in the "groundwater mode") require drive rods of sufficient diameter to allow passage of the well sounder, generally about 1/a inch. HydroPunch' II in the "hydrocarbon mode" (water table sampling) requires drive rods of a minimum 1-1/8-inch diameter to allow passage of the .1-inch-outside-diameter bailer. As stated earlier, HydroPunch!I (and HydroPunce IIin the "groundwater mode") cannot be used at sampling depths less than 5 feet below the water table. HydroPunchm I, when full, ! DISCRETE-DEP'T'H SAMPLING Page 5 of 6 MSCIPROTO-DS.= REVISION DATE:-MARCH 1996 DS-5