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SOP #12 Date:9/l/93 Page 12 of 31 The HydroPunch will be used if: • The sample can be collected from 5 feet or more below the top of the water table; and • L2 liters of sample volume will be adequate. The sample is collected and transported to the surface within the body of the tool. As the tool is pulled upward, increased hydrostatic head closes lower and upper check valves that retain the sample within the body of the tool. At the surface, the HydroPunch is inverted, and the ground water sample is decanted through a top discharge valve and tubing. The sample containers, preservatives, and holding times required for specific ground water parameters are specified in Section 6.0. Upon commencement of sampling, the VOA vials will be completely filled first. Each filled, capped vial will be inverted to ensure no air bubbles are present. If an air bubble is present, the vial will be opened and topped off with additional sample. The vial will be immediately capped and checked again for bubbles. If air bubbles are still present, the VOA vial will be discarded and a new vial used. The VOA vial filling procedure is repeated until no air bubbles are present. After the VOA vial is filled, the other sample containers will be filled. Samples collected for metals and general minerals analysis will be filled to the base of the bottle neck. Care will be taken not to aerate the sample during transfer from the bailer to the sample bottles and not to overfill bottles containing preservatives. All water samples will be kept in a cooler with ice or frozen ice packs from the time they are collected until they are extracted or analyzed. The turbidity of samples will be recorded in the field notebook and/or on data collection forms to allow a qualitative evaluation of results. 5.2.4 Sample Filtration The following procedure will be followed for field filtration of HydroPunch samples. Powderless, surgical gloves shall be worn during this procedure.