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KLEINFELDER File No. 20-3978-01.Wr6 February 24, 1997 gallon drums and left on site for later discharge or disposal by the client, depending on laboratory results. After the wells are developed, the aquifer is allowed to equilibrate for at least 24 to 48 hours. The wells can then be purged and sampled. Purging and sampling may be accomplished with Teflon bladder pumps and/or bailers. During the purging of the wells, field parameters (pH, conductivity, and temperature) are monitored. Samples are collected after the field parameters have stabilized (normally requiring the removal of three to five well volumes). Water sampling containers are supplied and prepared by the laboratory. These sample containers are immediately sealed after sample collection and placed in an iced cooler. At the end of the day, the water samples are delivered under chain-of-custody to an analytical laboratory certified by the state for the planned chemical analysis. A-3.3 Sample Handling After labeling, the sample is immediately stored in an iced cooler for transport to the analytical laboratory. The label includes Kleinfelder's name, job number, the date and time the sample was collected, the employee number of the individual who performed 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. 20-3978-0l.WR61207RE074.doc Page No.A-5 0!997,Kleinfelder,Inc.