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GEOMATRIX The field sampler will sign the CHAIN-OF-CUSTODY RECORD and will record the time and date at the time of transfer to the laboratory or to an intermediate person. A set of signatures is required for each relinquished/reserved transfer, including transfer within Geomatrix. The original imprint of the chain-of-custody record will accompany the sample containers. A duplicate copy will be placed in the project file. If the samples are to be shipped to the laboratory,the original CHAIN-OF-CUSTODY will be sealed inside a plastic bag within the ice chest,and the chest will be sealed with custody tape which has been signed and dated by the last person listed on the chain-of-custody. U.S. Department of Transportation shipping requirements will be followed and the sample shipping receipt will be retained in the project files as part of the permanent chain-of-custody document. The shipping company(e.g.,Federal Express,UPS,DHL)will not sign the chain-of-custody forms as a receivor;instead the laboratory will sign as a receivor when the samples are received. 5.0 EQUIPMENT CLEANING Bailers,sampling pumps,purge pumps, and other non-dedicated purging or sampling apparatus will be cleaned before and after sampling each well. Factory new and sealed disposable bailers may be used for sampling,but may not be reused. Thermometers,pH electrodes,and SEC probes that will be used repeatedly will be cleaned before and after sampling each well and at any time during sampling if the object comes in contact with foreign matter. Purged waters and solutions resulting from cleaning of purging or sampling equipment will be collected and stored properly for future disposal by the client,unless other arrangements have been made. Cleaning of reusable equipment that is not dedicated to a particular well will consist of the following: • Bailers-the inside and outside of bailers will be cleaned in a solution of laboratory- grade detergent and potable water, followed by a rinse with deionized(DI)water. They may also be steam-cleaned,followed by a DI water rinse. If samples are to be collected for metals analysis,the Teflon bailer may be rinsed with a pH2 nitric acid solution followed by a double DI rinse. • Purge Pumps-All downbole,reusable portions of purge pumps will be steam- cleaned on the outside. If the pump does not have a backflow check valve,the I:\Doc_Safe\PROTOCOL\PROTO-MW.doc SAMPLING OF GROUNDWATER MONITORING,WELLS AND WATER SUPPLY WELLS Revision Date: March 1996 Page 8 of 9