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SOP No. 10.0 Decontamination of Sampling Equipment <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 <br />D.I. 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 <br />procedure by placing a dry paper towel adjacent to the tape reel and the wet paper towel a <br />few inches away from the dry paper towel toward the probe. Slowly reel in the tape <br />ensuring that the tape is thoroughly wiped with both the paper towels. If necessary, repeat <br />the procedure or replace the 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 <br />water level indicator tape, the tape must be thoroughly rinsed with deionized water and <br />wiped dry with 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 />5.1.3 Equipment Leaving the Site <br />All sampling equipment will be cleaned prior to leaving the site. Vehicles used during field <br />activities shall be cleaned on an as-needed basis with soap and water on the outside and <br />vacuuming the inside. <br />4/23/07 Page 3 of 6 R Squared Inc. <br />Attachment A