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E <br /> E <br /> MIMI 101011 <br /> 2 <br /> '."he temporary vapor probes installed for the i <br /> were constructed of '/2-inch diameter Schedule <br /> �'ige. A investigation <br /> i e. A point was forged on one end. _inch 40 steel <br /> Perforations were drilled into the Pro range of <br /> at 3 inches from the point {Figure A probe beginning <br /> wer_ driven pneumaticallyy The vapor probes <br /> intervals. The de into the soil at vare depth <br /> 16 feet, 1a to 21 depth intervals include 8 to p <br /> below rade. feet, 28 to 30 feet 10 feet, 14 to <br /> g In locations where and 32 to 34 feet <br /> concrete or asphaltby <br /> the soil was <br /> throe ► a 1-inch diameter hale was drillvered d <br /> through the surface material with an electric roto-hammer. <br /> The existing groundwater monitorin <br /> - depth interval of g wells were meter. <br /> 28 to 58 feet below screened at a <br /> 77 After grade. <br /> r installation, a vacuum was <br /> r <br /> extractduring soil gas. One psi sam sample pressure <br /> to each probe to <br /> ! the analysis. <br /> Sample flow preSsure was maintained <br /> pressures were checked before each testrate and instrument <br /> i. samplEd through a 1 The soil gas was <br /> connected to a stainlesssteel <br /> sample line that was <br /> Teflaa tubing minimizes samplel well head fitting. Use of <br /> I the possibility of distortedreSultsthrough also <br /> r contamin;�ted by a from a sample tion and <br /> Filteperfors <br /> an the samplelinebefore and d checks <br /> line <br /> analysis <br /> Leak checks were <br /> Filters were used extensivel during the <br /> remove foreignY throughout the systematolysis. <br /> material from the sample <br /> line was connected to a diaphragmp pathway. The sample <br /> I <br /> Beckman Model The extracted soil gas wa located in a mobile <br /> 400 Total Hydrocarbon was analyzed using a <br /> Flame Ionization Detector (FID) Analyzer equipped with a <br /> a Houston Instruments chart and the results <br /> recorder. recorded on <br /> was calibrated using certified standards of$eC an Model 400 <br /> throughout The instrument was propane in <br /> recalibrated <br /> ghout the day using certified standards, <br /> periodically <br /> J <br /> Performance_..Test......_. . - <br /> ........... <br /> A portable skid containing a vacuum <br /> _ f vacuum gauges t}::.s used on site. pump, flow meters <br /> con;�ected to a A rigid ► and <br /> Probe or monitoring well to create <br /> Zine was <br /> _ry extraction point. Three Of. t create an <br /> ! installed for the Three <br /> Gas Survey temporary vapor <br /> ? Monitoringrvey and three existinges <br /> volume of <br /> wells were used as <br /> air was pumped fro <br /> m' extraction points. A set <br /> extraction point was tested forha maximumion <br /> point. Each <br /> The informat <br /> } w of 15 minutes. <br /> ion from the Performance <br /> i'. determine the. <br /> capture radius Test was used to <br /> the dis,..ance at which the <br /> F <br /> n <br /> 4"� <br />