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KLEINFELDER the sampling, and a unique five-digit sample identification number. A custody seal is also placed on the sample in such a way that any attempt to tamper with the sample is easily visible. An example of a sample label and custody seal are attached at the end of this appendix. A Kleinfelder chain-of-custody form is attached to the cooler. The chain-of-custody form ` includes Kleinfelder's name, address and telephone number, the employee number of the individual who performed the sampling, the sample numbers, the date and time the samples were 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. A-4.0 COLLECTION HYDROPUNCH lie GROUNDWATER SAMPLES One-time groundwater samples are collected using a Hydropunch Ile, 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 II° casing to obtain a sample of groundwater (which has entered the Hydropunch Ile due to hydrostatic pressure). r„ 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. 90163.T031ST07R1061 January 3,2008 0 2007 Kleinfelder Page A-5