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File No. 20-3937-01 k4 KLEINFELDER September 3, 1996 i 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. '-1 urging 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 theq;retnoval of three to hive well volumes). Water sampling containers are supplied and prepared by the laboratory. These sample`containers are immediately sealed after saniple collection and;placed in'an iced cooler. At:thc end of the i day, the water samples are, delivered under chain-of-custody to an analytical laboratory certified by the state for the planned the thea] analysis. B-3.3 Sarre le Handling_ After labeling, the sampte 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 Kleinfefdcr chain-of-custody form is,attai2hed 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 samplings the:sample numbers, the date and time the samples were collected, the number of..containersleacll 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 snd the receiving'.employee of the analytical laboratory when the samples are delivered. An example of the chain-of-custody form is attached. h 13-3.4 Equipment Decontamination k 14 To reduce the potential for cross-contan:ii;nation between wells, all developing and sampling 4. equipment is washed in a trisodium phosphate solution and rinsed .in distilled water or steam cleaned prior to use in the next monitoring well. 20-3937-61/MR960189 Page Na B-5 Copyright 1996. Kleinjelder, Inc. I: