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1 <br /> I <br /> 1 1 t <br /> ' 14 November 1995 r <br /> AGE NC Project No 95-0121 <br /> Page'6 of 20 h <br /> _ 1 <br /> points using Magnehelic vacuum gauges ' <br /> The hydrocarbon vapors are destroyed as part'ofthe normal internal combustion process Emissions <br />' from the engine are routed through two catalytic converters to maximize the-destruction rate of the - <br /> extracted hydrocarbon vapors <br /> 4 <br /> 52 PILOT TEST PROCEDURES <br /> f _ The test was tritiated at 8 00 am on 3 August 1995 and continued for approximately 8 hours Air- <br /> tight well caps, pre-connected with Magnehelic vacuum gauges, were attached to VW-1 and VW-2 <br /> 'The air stream from EW-1 wds monitored for the presence of organic vapors using a PID <br />' Measurements were recorded at regular intervals throughout the test and are included in Table 4 The <br /> air flow was monitored using a Dwyer DS-200 flow sensor The flow rate is determined from the <br /> measured differential pressure and the piping diameter using a nomograph Field sheets and the <br />' Dwyer DS-200 graph are included in Appendix D <br /> 53 COLLECTION AND ANALYSIS OF VAPOR SAMPLES <br /> A total of four vapor samples were collected at two-hour intervals from the inlet of the extraction <br />' well to measure concentrations of extracted hydrocarbon vapors The samples were collected in <br /> Tedlar bags using a PID as an air pump Due to the high vacuum maintained by the extraction unit, <br />' the IC engine was slowed or stopped to allow sample collection L <br /> r r <br /> After collection, samples'were placed in a covered container and transported under chain-of-custody <br />' to McCampbell Analytical Inc (MAI) in Pacheco, California Each sample was analyzed within 72 <br /> hours for TPH-g and BTE&X in accordance with EPA methods 8015m and 8020, respectively <br /> 7 ' <br /> 3 5 4 RESULTS OF VAPOR EXTRACTION PILOT TEST <br /> The vacuum potential at the extraction well exceeded the measurable range of the Magnahelic gauges <br />' available The blower vacuum measured at the IC engine was recorded Vacuums of up to 12 3 inches <br /> t of Hg (167" H2O) were recorded at the blower unit Flow rates of 25 to 30 standard cubic feet per <br />' mmute (scfin) were calculated from field data <br /> a I <br /> The induced vacuum was measured in VW-1 and VW-2 The greatest vacuum was measured in VW- <br /> 1, approximately 15 feet from EW-1 Vacuum measurements ranged from 125 inches to 135 inches <br /> of water in VW-1 during the final 2 hours of the pilot test Vacuum measurements ranged from 0 80 <br /> i <br /> I 3 <br /> { 1 1 1 <br /> I { 1 <br /> S rF 1 { <br /> r 1 1 <br /> 1 1 <br /> S <br /> �wr� <br />