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ES-RR&IH-001 ® Stantec Soil Sampling SOP Page 8 of 11 Rev. 2 Jun 2016 practicable so that the soil from the bottom of the trench will be placed on the bottom, and the topsoil will be replaced on the top. The backhoe will be used to backfill and compact the excavation. Upon completion and subsequent backfilling of each excavation, four corners will be marked with a wooden stake for surveying. If appropriate, a fifth stake will be placed above the location where a soil sample was collected. The points may be surveyed, as needed. 8.4 Decontamination Methods 8.4.1 Sampling Equipment Decontamination The following steps will be used to decontaminate sampling equipment: • Ensure that the decontamination process has been carefully designed to be sure that the solutions used are appropriate for the chemicals of interest. • Ensure that the decontamination area is properly constructed to keep contamination within the contamination reduction and exclusion zones. • Ensure that the decontamination area is properly constructed to contain the rinse solutions and solids. • Personnel will dress in suitable safety equipment to reduce personal exposure. • Smaller equipment that will not be damaged by water will be placed in a wash bucket containing an AlconoxTm (or equivalent) solution and scrubbed with a brush or clean cloth. Smaller equipment will be rinsed in water. Change rinse and detergent waters between boreholes, as needed. • For larger drilling equipment the soil and/or other material will be scraped off with a flat-bladed scraper, and placed within a deconcontamination (decon) pad. The decon pad will be constructed in a predetermined location, and equipment shall be cleaned with a pressure washer using potable water. Care will be taken to adequately clean the insides of the hollow-stem augers, and cutter heads. • Equipment that may be damaged by water will be carefully wiped clean using a sponge and detergent water and rinsed in or wiped down with distilled water. Care will be taken to prevent any equipment damage. Following decontamination, equipment will be placed in a clean area or on clean plastic sheeting to prevent contact with potentially contaminated soil. Following decontamination, drilling equipment will be placed on the clean drill rig and moved to a clean area. If the equipment is not used immediately, it will be stored in the designated secure, clean area. THIS INFORMATION FOR AUTHORIZED COMPANY USE ONLY STANTEC CONSULTING