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<br />Geocon Project No. S2170-07-12 - 19 - June 6, 2022 <br />The primary principle in consideration of decontamination procedures is: Avoid unnecessary <br />contamination of PPE and Sampling Equipment. The following decontamination guide for construction <br />materials, equipment, and PPE have been developed with the intent of reducing the potential for the <br />transfer of hazardous chemicals outside the Exclusion Zone. <br />6.1 Construction Materials and Equipment <br />The PM or designee will control site access to ensure only authorized personnel and equipment and <br />materials necessary for work handling impacted soils will be allowed in the exclusion zone. The <br />exterior surfaces of excavation equipment, including buckets, tires and/or tracks will be scraped with <br />shovels to remove substantial deposits of potentially contaminated soil prior to being rinsed with water. <br />Shovels, hand tools, and other equipment will also undergo gross decontamination to remove any <br />potentially contaminated soils. Soil, dust, debris, water and decontamination rinseate will be controlled <br />to prevent entering nearby storm drains, creeks, or streams. <br />6.2 Sampling Equipment Decontamination <br />Decontamination of soil sampling equipment shall include washing with a solution of TSP, Alconox®, <br />or Liquinox® and water followed by a double rinse of deionized water between samples and before <br />vacating the work area. <br />6.3 PPE Decontamination <br />The PSO will determine the necessity for and level of decontamination appropriate to this project. <br />Decontamination of PPE may be accomplished by personnel passing through separate stations or stages <br />to reduce and remove contaminated clothing and equipment. Decontamination stations may include the <br />following procedures listed sequentially below. <br /> <br />Stage No. 1: Segregated Equipment Drop - Equipment and consumables that require either disposal or <br />special handling (e.g., special and/or equipment decontamination) shall remain in this area and be <br />decontaminated, if appropriate, or disposed of with the excavated materials or other potentially <br />impacted materials. <br /> <br />Stage No. 2: PPE Decontamination – Disposable PPE that has been potentially impacted will be placed <br />in 55-gallon steel drums or plastic liners and disposed of with the other solid wastes generated. <br /> <br />Stage No. 3: General Field Wash - Personnel shall wash and rinse face and hands with soap and <br />water before leaving the site and/or eating. If changing of clothing is necessary, it shall be done at <br />this time. Respirator decontamination, if required, shall include a wash with soap and water followed <br />by a clean water rinse.