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KLEINFELDER collected, the number of containers each sample occupies, and the analyses for which the samples are being submitted. The chain-of-custody form is signed by each person who handles the samples, including all Kleinfelder employees and the receiving employee of the analytical laboratory when the samples are delivered. An example of the chain-of-custody form is attached. A-3.4 Equipment Decontamination To reduce the potential for cross-contamination between wells, all developing and sampling equipment is washed in a trisodium phosphate solution and rinsed in distilled water or steam cleaned prior to use in the next monitoring well. A-3.5 Well Survey The locations of soil borings and monitoring wells and the elevation of the top of the PVC casings is usually surveyed and tied into permanent markers, if readily available. Survey accuracy is 0.1 foot for the "x" and "y" coordinates and .01 foot for the "z" coordinate. The ` depth to static ground water is measured from a set location at the top of the PVC casing. The depth of water is then subtracted from the elevation of the top of the well casing to provide a ground water elevation for each monitoring well location. A4.0 COLLECTION HYDROPUNCH II® GROUNDWATER SAMPLES One-time groundwater samples are collected using a Hydropunch II®, which is an in situ groundwater sampling device. The borings will be advanced to a depth equivalent to the bottom of the capillary fringe. A stainless steel drive tip equipped with a filter is lowered into the ` borings at the end of a 2.5-inch diameter galvanized steel pipe and pushed using the drill rig approximately 3 to 5 feet into the soil/aquifer formation at the bottom of the boring. A ` thoroughly decontaminated bailer can then be lowered down the center of the Hydropunch He casing to obtain a sample of groundwater (which has entered the Hydropunch ITO due to hydrostatic pressure). To reduce the potential of introducing contaminants into the samples, the drive tip, galvanized pipe, and other equipment used for sample collection are steam cleaned and/or washed with trisodium phosphate (TSP) solution and rinsed with distilled water prior to use. The sample tips and filters are not retrievable. New O-rings, tips, and screens are used for each sample. w 21073/ST03R1067 Page A-5 O 2003 Kleinfelder,Inc. July 28,2003 r