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September 12. 1991 <br /> ARCO Station No. 207b, Lodi. California <br /> � llect itlitial influent vapor samples from wells VW-3 and <br /> RESNA used the I.C. engine to co <br /> VW-2 The I C engine was operated for approximately 30 minutes on each well before <br /> ample bag from the LC. engine inlet sample port. The <br /> collecting the vapor samples into a s <br /> airstream at the wellheads were measured and <br /> flow, vacuum, and temperature of the <br /> recorded in Table I. <br /> le the <br /> ead vacuum, <br /> Well VW-1 was used as the vapor-extractia er tulre, andfor 4 lvacuumours tinfluenceloln wells VW-2 <br /> flow rate, organic vapor concentration, temp operational data collected <br />` and VW-3 were measured and recorded every 30 mints.ample collected into a sample bag <br /> during the VET is summarized in Table 1. A vapor <br /> afterFine <br /> from a sample port at the inlet of the s between thewells are 30 5 feet(well VW-1 to well <br /> 30, 120, and 240 minutes. The distance <br /> VW-2) and 36.0 feet (well VW-I to well VW-3). <br /> RESNA initiated a Chain of Custodv Record that accompanied the vapor samples to a <br /> State-certified laboratory. We followed chain-of-custody protocol throughout field and <br /> ia Analytical in Concord, <br /> laboratory procedures. The sample �o at rylCertif cat Noyzed at . 14)for benzene,toluene, <br /> California(Hazardous Waste Testing envy(EPA) <br /> total xylene isomers,and ethylbenzene by modified Environmental Protection ( using <br /> Method 8020 and for total petroleum lt ydrocarbons repor laboratory analyses for iheted as lvapor samples are <br /> modified EPA Method 8015. <br /> summarized in Table 1. Copies of the Chain of Custody Records and results of iaboratet;, <br /> anal;es of the vapor samples are attached. <br /> RETS <br /> The final vacuum reading recorded from the pumping well VW-1 was 8.5 inches of water <br /> at 41 cfm. ls were 0.34 inches <br /> The final vacuum readings W 1 t 41 clip;the <br /> = 30.5 felet) and 0.28 inches <br /> of water at VW-2 (extracting fro The vacuum <br /> of water at VW-3 (extracting from VW at 41 cfm; distance redictinetvapor-extraction <br /> measurements obtained from this VET are suited for use in predicting <br /> system specifications. <br /> The results of laboratory analyses of the vapor samples indicated that TPHg concentrations <br /> 0 milligrams per cubic meter(mg/m <br /> 3 from well VW-1 after 240 minutes of <br /> ranged from 18 ) <br /> 3 from well VW-1 after 30 minutes of operation. <br /> operation is 5,600 mg/m <br /> 091?CG1P. - --2 <br /> 3OWS-4 <br />