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. 2 3 1 Soil Monitoring <br /> Field screening of excavated soil and excavation boundaries for petroleum hydrocarbons <br /> was conducted using a PID and the IAP. While the PID detects the total vapor concentration <br /> of organic hydrocarbon constituents, the IAP tests specifically for the presence of petroleum <br /> hydrocarbons in the soil. The PID was used to monitor the ambient temperature headspace <br /> above a container partially filled with soil sampled at select discrete intervals. Random sod <br /> samples were also screened using the IAP to validate PID readings These screening techniques <br /> allowed continuous excavation without stopping for confirmation laboratory test results <br /> 2.3 2 Air Monitoring <br /> Downwind atmospheric conditions were monitored with a PID once every two hours <br /> during excavation and treatment pile construction The monitoring was conducted to evaluate <br /> • potential impacts offsite and to onsite workers PID readings were generally at background <br /> levels (0 parts per million [ppm]), however, when strongly impacted soil was placed onto the <br /> treatment pile, PID readings occasionally rose to near 20 ppm before returning almost <br /> immediately to background levels To limit offsite vapor emissions, treatment piles were covered <br /> with industrial 6-mil plastic sheeting <br /> FASCLOSE 2 2-6 92-1177102.36 <br />