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i <br /> p • <br /> i <br /> } <br /> 30 grams from an undisturbed soil sample, placing this subsample in a clean glass jar, and <br /> sealing the jar with aluminum foil secured under a ring-type threaded lid. The jar was warmed <br /> for approximately 20 minutes (in the sun) the foil pierced, and the head-space within the jar <br /> tested for total organic i,vapor, measured in parts per million as benzene (ppm; <br /> volume/volume). The instrument was calibrated prior to drilling using a 100-ppm isobutylene <br /> standard,(in air) and a.sensitivity factor of 55 which relates the photo-ionization potential of <br /> benzene to that of isobutylene at 100 ppm. The results of the field testing are noted on the <br /> boring logs. PID reading's are useful for indicating relative levels of contamination, but cannot <br /> be used to evaluate hydrocarbon levels with the confidence of laboratory analyses. <br /> Well-Development and'',Groundwater Sampling 1 <br /> The groundwater monitoring wells were developed and sampled by Blaine Tech Services, Inc. G <br /> (Blaine). Reports by Blaine.,'which presents well development and sampling procedures and # <br /> field data`sheets are presented at the end of this attachment. <br /> r � <br /> Rinsate; Purge, and Deyelopment Waters, and Soil Cuttings Storage and <br /> Disposa'I <br /> Waters produced during field activities were transported via a purge trailer and disposed of at <br /> a state-certified treatment and disposal facility. When necessary, waters were temporarily <br /> stored on in DOT-approved 55-gallon drum pending transport and disposal. <br /> Laboratory Procedures, <br /> Selected soil samples and,groundwater samples were analyzed for the presence of total petro- <br /> leum hydrocarbons calculated as gasoline (TPH-g), TPH calculated as diesel (TPH-d), f <br /> benzene; toluene, ethylbenzene, and xylenes using modified EPA Methods 8015_ (modified) <br /> and 8020. In addition, two soil samples were analyzed for the presence of oil and grease by <br /> SM 5520 E and F modified, volatile and semivolatile organic compounds by EPA <br /> Methods 8240 and 8270, and metals by the ICAP method. <br /> a <br /> Ai <br /> 3 2015 3 1 AIREPORT A - 2 September 13, 1995 <br /> i <br /> ' 1 <br />