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'1 <br /> 1 <br />' Organic Vapor Procedures <br /> Soil samples collected in the field were analyzed using a flame-ionization detector or photo- <br /> ionization detector The test procedure involved measuring approximately 30 grams from an <br />' undisturbed soil sample, placing this subsample in a clean glass Jar, and sealing the Jar with <br /> aluminum foil secured under a ring-type threaded lid The Jar was warmed for approximately <br /> 20 minutes (in the sun), then the foil was pierced and the head-space within the Jar tested for <br />' total organic vapor measured in parts per million as benzene (ppm, volume/volume) The <br /> instrument was previously calibrated using a 100-ppm isobutylene standard (in air) and a <br />' sensitivity factor of 0 55 which relates the photo-ionization potential of benzene to that of <br /> ]sobutylene at 100 ppm The results of these tests were recorded on the boring logs <br /> (attached) <br /> 1 <br /> Well Development <br />' The new installed monitoring wells were developed by surging the screened interval with a <br /> surge block and purging ten casing volumes of water from each well Well development <br /> water, and steam-clearung rinsate water were temporarily stored on site in drums and later <br />' disposed of by a licensed hauler <br /> Laboratory Analysis <br /> Selected soil and groundwater samples were analyzed in the laboratory for the presence of <br /> total petroleum hydrocarbons calculated as gasoline (TPH-g), total petroleum hydrocarbons <br /> calculated as diesel (TPH-d), and benzene, toluene, ethylbenzene, and xylenes (BTEX <br /> compounds) Extraction was performed by the purge and trap technique (EPA <br />' Method 5030) Analysis for TPH-g was performed according to modified EPA <br /> Methods 5030 and 8015, analysis for BTEX compounds was by EPA Methods 5030 and <br /> 8020 Final detection was by gas chromatography using a flame-ionization detector and a <br />' PID All analyses were performed by a California State-certified laboratory <br /> Additionally, selected soil and groundwater samples from the wellbore near the former waste <br />' oil tank were analyzed in the laboratory for the presence of total oil and grease by EPA <br /> Method 5 520 E and F (gravimetric), purgeable halogenated hydrocarbons by EPA Method <br /> 8010, and metals cadmium, chromium, lead, nickel, and zinc by EPA Method 6010 These <br />' analytical methods utilize gas chromatography and mass-spectrometry <br /> 1 <br /> 3100971A/REPORT A - 2 November 22, 1995 <br /> 1- - <br />