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x#70 <br /> ' extraction well on the negative pressure (suction) side of the VE blower The velocicalc was used to <br /> measure the flow rate from the extraction well during the test equipment operation <br /> Each VE test lasted approximately three hours and was conducted in four separate vacuum/flow rate <br /> tsteps The first step of each test began with the system manual air dilution valve fully open, creating a <br /> slight vacuum on the respective extraction well The second and third steps of the VE test involved <br /> ' partially closing the test system manual dilution valve in order to create successively higher vacuum and <br /> flow rates from each respective test well The fourth and final step of each test involved closing the <br /> ' manual dilution valve 100%, thus creating the highest possible vacuum and flow rate in the extraction <br /> well <br /> The induced vacuum response created during system operation was observed at various on-site <br /> ' monitoring points including nested monitor wells MW-IA and 1B, MW-3A and 3B,and MW-4A and 4B <br /> (Figure 2) Magnehelic gauges were connected to these monitoring points to measure the lateral vacuum <br /> ' • response At periodic intervals during VE testing, the achieved vacuum and flow rates from the <br /> respective extraction test wells, and the induced vacuum response at the lateral monitoring point wells, <br /> ' were recorded on individual field data sheets The VEW-1 and VEW-2 field data sheets have been <br /> reproduced as Tables 6 and 7,respectively Relevant well construction details for the remedial test wells <br /> ' and lateral monitoring point wells are listed in Table 3 <br /> 4 2 2 Vapor Sampling <br /> During the fourth step of each VE test, following stabilization of the vacuum and flow rate, a vapor <br /> sample was collected from the influent sampling port of the test trailer The influent sampling port is <br /> located on the pressure side of the test system blower A total of two vapor samples (one per test) were <br /> collected during the program Cine-liter capacity Tedlar bags were used as the air sample containers for <br /> ' each sample Upon collection, the vapor samples were placed in a cooler for protection from direct <br /> sunlight Each vapor sample was delivered to Sequoia Analytical in Morgan Hill, California for <br /> ' laboratory analysis Each vapor sample was analyzed for volatile fuel hydrocarbons, VOCs (including <br /> BTEX), and for fixed gases including methane, carbon dioxide, oxygen and nitrogen <br /> 12 <br /> I' 1 <br />