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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 aground water elevation for each monitoring well location. A-3.6 Surface Water Sampling Surface water samples are obtained by dipping clean laboratory prepared bottles gently into the water body. Samples containers are filled so that no air bubbles are present. Care should be taken not to disturb bottom sediment or otherwise introduce foreign material into the sample. After collection samples are labelled and handled as in other types of sampling. Frequently field parameters such as pH, temperature, and conductivity are measured at the time of sampling.