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' Drajt: April S, 1999 <br />Page D-2 <br />' D.3 DECONTAMINATION PROCEDURE <br />This section gives the step-by-step procedures equipment decontamination in the field. <br />' Before any well purging or sampling begins, all well probes, bailers, and other sampling devices <br />shall be decontaminated, as described below. <br />' D.3.1 Sampling Equipment <br />The following steps should be used to decontaminate sampling equipment: <br />' Remove gross contaminants with scraper, wire or plastic brush, if necessary. <br />- Wash equipment with Alconox and potable water, typically in a 5-gal bucket or tub. <br />' Rinse with potable water <br />- Double rinse with deionized water <br />- Wrap clean equipment in clean plastic bags for transport, if necessary. <br />' Equipment that may be damaged by water will be cazefully wiped clean using a sponge and <br />detergent water and rinsed with laboratory-grade distilled or deionized water. Care will be taken to <br />' prevent any equipment damage. <br />Rinse and detergent waters will be replaced with new solutions between borings or sample <br />' locations. Wash and rinse water will be disposed either in the plumbing system at the mine, or on <br />the ground in the field. <br />D.3.2 Submersible Pumps <br />The pump and pump hose will be cleaned prior to use in each well or piezometer, except in <br />' the case ofwell-dedicated pumps. The cleaning procedure will consist of immersing the pump in <br />a 5-gal bucket containing a solution of potable water and laboratory-grade nonphosphate detergent. <br />' The pump will be turned on and the solution circulated through the pump and back into the bucket. <br />The pump will then be immersed in a second bucket containing potable water only. The pump will <br />' be turned on and the potable water will be allowed to circulate through the pump. This water will <br />not be recirculated. Pumping will continue until the dischazge water is cleaz. Additional potable <br />water will be added to the bucket as necessary. The pump exterior and hose will be cleaned by <br />' steam-cleansing, washing in a solution of laboratory-grade nonphosphate detergent and potable <br />water, and rinsing with distilled or deionized water, including an final rinse with laboratory-grade <br />' distilled or deionized water. The pump and hose should be wrapped in clean, plastic bags for <br />transport to the well location. <br />' Agapito Associates, Inc. <br />