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SOP No. 10.0 Decontamination of Sampling Equipment <br />• Equipment that will not be damaged by water (e.g. YSI sonde, surface water collectors) will <br />be rinsed, washed, or sprayed with D.I. water and a brush if necessary, and then wiped clean <br />with a paper towel. Spray water may be collected by paper towels and disposed of <br />appropriately. <br />• Equipment that may be damaged by water (such as a specific conductivity meter) will be <br />carefully wiped clean when necessary using a sponge or towel and then rinsed again with D.I. <br />water. Care will be taken to prevent damage to equipment. <br />• Rinse (and detergent) waters will be replaced between sample locations. <br />• Used rinse (and detergent) water will be disposed of properly at a designated location at the <br />site. <br />Following decontamination, equipment will be placed in a clean area or in clean plastic <br />wrap/bags. <br />5.1.1.1 Sample Decontamination Procedure for Decontamination of a Water Level Meter <br />1. Thoroughly wet a paper towel or Kimwipe with deionized water from a squirt bottle. <br />2. Clean tape by wiping with paper towel soaked with deionized water followed by wiping <br />with a dry paper towel. To facilitate decontamination, two people can perform the procedure by <br />placing a dry paper towel adjacent to the tape reel and the wet paper towel a few inches away <br />from the dry paper towel toward the probe. Slowly reel in the tape ensuring that the tape is <br />thoroughly wiped with both the paper towels. If necessary, repeat the procedure or replace the <br />paper towels as they become soiled. <br />3. The water level probe can be cleaned by spraying the probe with deionized water and <br />wiping it dry with a clean paper towel. <br />4. If persistent stains or oily films are present on the tape, apply pesticide-free-grade <br />isopropanol to a paper towel and wipe tape until clean. Because solvents can damage the water <br />level indicator tape, the tape must be thoroughly rinsed with deionized water and wiped dry with <br />a clean paper towel. Allow tape to completely air dry. <br />5. Place water level indicator in the clean carrying case or in a clean plastic bag to prevent <br />contamination during transportation to the next location. <br />6. Place used towels in the designated field trash container for proper disposal. <br />5.1.2 Large Equipment <br />Drilling equipment (rigs, drill rods, augers, bits, casing, etc.), downhole logging equipment, and <br />other large pieces of field equipment should be high-pressure steam cleaned before and after use. <br />Steam cleaning will be performed at an appropriate decontamination area specified by the field <br />manager. The decontamination area shall be capable of containing decontamination fluids and <br />solids. <br />4/23/07 Page 3 of 7 R Squared Inc.