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' Draft: Apri! 5, /999 Page D-3 <br />1 <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br />LJ <br />D.3.3 Drilling Equipment <br />Drilling equipment should be cleaned in an azea downslope and a minimum of 100 ft away <br />from sampling locations prior to mobilization to the site, or in an approved azea prior to drilling at <br />the site. The following steps will be used to decontaminate drilling and heavy equipment: <br />- Equipment showing gross contamination or having drill cuttings caked on will be <br />scraped off with aflat-bladed scraper at the sampling or construction site. <br />- Equipment, such as drill rigs, augers, drill bits, and shovels will be sprayed with by <br />ahigh-pressure washer. <br />Following decontamination, drilling equipment will be placed on the clean drill rig and <br />moved to a clean area. <br />D.3.4 Monitoring Well and Piezometer Materials <br />Monitoring well and piezometer materials will be factory pre-cleaned, if possible. Any <br />material which is not factory-cleaned and sealed, including casings, screens, etc., will be <br />decontaminated as described above, by spraying with detergent water using ahigh-pressure washer, <br />then rinsing with potable water. If the materials aze not to be used immediately, they will be stored <br />in a designated clean azea or wrapped in clean plastic bags for transport to the well location. <br />D.4 DOCUMENTATION <br /> <br />1 <br />lJ <br /> <br />1 <br /> <br />1 <br />Sampling personnel will be responsible for documenting the decontamination of sampling <br />and drilling equipment. The documentation should be recorded with waterproof ink in the sampler's <br />field notebook with consecutively numbered pages. The information entered in the field book <br />concerning decontamination should include the following: <br />- Decontamination personnel <br />- Date and start and end times <br />- Decontamination observations <br />- Weather conditions <br />' Agapito Associates, Inc. <br />