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Organic Vapor Procedures <br />Soil samples are collected for analysis in the field for ionizable organic compounds using a PID <br />with a 10.2 eV lamp. The test procedure involves measuring approximately 30 grams from an <br />undisturbed soil sample, placing this sub-sample in a Ziploc® type bag or in a clean glass jar, <br />and sealing the jar with aluminum foil secured under a ring-type threaded lid. The container is <br />warmed for approximately 20 minutes (in the sun); then the head-space within the container is <br />tested for total organic vapor, measured in parts per million as benzene (ppm; volume/volume). <br />The instrument is calibrated prior to drilling. The results of the field-testing are noted on the boring <br />logs. PID readings are useful for indicating relative levels of contamination, but cannot be used <br />to evaluate petroleum hydrocarbon levels with the confidence of laboratory analyses. <br />Equipment Decontamination <br />Equipment that could potentially contact subsurface media and compromise the integrity of <br />the samples is carefully decontaminated prior to drilling and sampling. Drill augers and other <br />large pieces of equipment are decontaminated using high pressure hot water spray. Samplers, <br />groundwater pumps, liners and other equipment are decontaminated in an Alconox scrub <br />solution and double rinsed in clean tap water rinse followed by a final distilled water rinse. <br />Soil Cuttings and Rinsate/Purge Water <br />Soil cuttings and rinsate/purge water generated during drilling and sampling are stored on-site in <br />DOT-approved 55-gallon steel drums pending characterization. A label is affixed to the drums <br />indicating the contents of the drum, suspected contaminants, date of generation, and the <br />boring number from which the waste is generated. The drums are removed from the site by a <br />licensed waste disposal contractor to an appropriate facility for treatment/recycling. <br />Stantec