Laserfiche WebLink
C.3 Procedures <br />In most cases, the following procedures are adequate to remove contamination. <br />Preclean sampling equipment. If there is gross contamination on equipment, wipe it off with <br />paper towels and/or rinse it off with water. Additional internal decontamination may be possible <br />by circulation of water or cleaning solutions. <br />Wash all parts of equipment with detergent water and scrub with brushes. Take equipment apart <br />when appropriate to remove visible contamination. <br />Steannclean sampling equipment. The steamcleaner is effective in removing contamination, <br />especially volatile hydrocarbons. Steamcleaning is highly recommended in most cases and <br />sometimes is the only method for decontaminating equipment that is grossly contaminated with <br />hydrocarbons. <br />Rinse equipment by dipping in rinse solution, spraying, or pouring solution over it. Dip rinsing <br />can introduce contaminants into solution. Spraying might not allow a thorough rinsing of the <br />equipment, but it is a more efficient rinsing method because less rinse solution is used. <br />Appropriate rinsing solutions are specified in the project sampling and analysis plan. Some <br />typical solutions are indicated in the equipment section of this SOG. <br />Tap water <br />Deionized/distilled water. <br />Rinse the sampler with generous amounts of deionized water. Pouring water over the sampler is <br />best, although spraying or using a squirt bottle to apply rinse water might be adequate if you are <br />trying to minimize waste. <br />Prepare rinsate blanks. To ensure proper decontamination, submit a rinsate blank for analysis. <br />It is best to do this just before sampling. The blank should be analyzed for the same chemicals <br />the samples are being checked for and for the chemical used to decontaminate equipment, if <br />appropriate. <br />[Note: The heading for this section indicates procedures to remove contamination.] <br />To prepare a rinsate blank, pour millipore analyte-free water through or over the into the <br />sampler. Collect the rinsate water in a clean bottle. Pour the collected rinsate water into the <br />appropriate sample container(s). It is advisable to prepare one rinsate blank every day in the <br />field. Use water specifically for blank preparation. <br />Wipe sampling equipment with a paper towel or allow it to air dry. <br />Place samplers in clean plastic bags or sealed containers, or wrap them in aluminum foil for <br />storage in an undisturbed location that is free of contamination. <br />C.4 Investigation-Derived Residuals <br />For details of handling investigation-derived residuals refer to the project sampling and analysis <br />plan. <br />Additional Soil and Groundwater Sample Work Plan, 2 <br />BNSF Mormon Yard, Stockton, CA <br />1\fwybnsf2kbl1sl -platudlappc_sogequipdecon acpt cflog_wp doc