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December 13, 1999 <br />Pcgc D-1 <br />• D.3 DECONTAMINATION PROCEDURE <br />This section gives the step-by-step procedures for 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-gallon stainless <br />steel bucket or tub. <br />- Rinse with potable water. <br />- Double rinse with distilled water. <br />- Wrap clean equipment in clean plastic bags for transport, if necessary. <br />Equipment that may be damaged by water will be carefully wiped clean using a sponge and <br />detergent water and rinsed with laboratory-grade distilled water. Care will be taken to prevent any <br />• 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 fumed 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 discharge water is clear. 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 water, including an final rinse with laboratory-grade distilled water. <br />The pump and hose should be wrapped in c-can, plastic bags for transport to the well location. <br />Agapito Associates, Inc. <br />