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S`r'-01-1995 08 47 SIN JOAQUIN COUNTY DES 209 944 9016 P 01/01 <br /> y, 00LB 996 6W ST:93 S9GT-3£-ffPd <br /> 29 Apnl 1995 <br /> ,ACE-IAC-95-0103 <br /> Page 4of11 <br /> 4.0. VAPOR EXTRACTION PILOT TEST <br /> 4 1 SOIL VAPOR EXTRACTION SYSTEM <br /> C�A 6 March 199:5. an 9-!sour Boit vapor G%tractjon test was tnitiat ed TWS pilot test w= <br /> performed ra provide vapor extraction fWibility data for Wltiatmn of a f 4l scale remediation <br /> system <br /> The test was conducted using a r extraction system('VES). VACLEAN 10M, rrfatxsfacturcd <br /> by Envirt nawntal Techsaqua The VES consists Of a positive-displ nent blower, <br /> drven by an <br /> Internal combustion (IC) ensure The inlet of the V?ES is connected to an cmisung ev€trar,60n Droll <br /> (VW-1) The vacuum applied to the extraction we11 cauXs Mrocarbons in the $oil to volatilize <br /> and flow through the vacuum pump to the TC cn&'nte_ Induced vacuum pressures were motitored <br /> at s=oundtng monitoriug points by using Magneheltc va ra gaugc& The hydrocarbon vapors <br /> are destructed as part of the normal combustlon process Emissions from the et are routed <br /> through two catalYttc conveners tet nwximtze the destruction rate Of the extracted hy�drecsrbon <br /> vapors <br /> 42 PILOT TEST PROCI~DUDS <br /> The text was initiated at 4 00 am on 6 March 1995 and lasted for apprroxinWOY S hours. Air-tight <br />. well caps, pre-Contracted Wth magnchebt vacrsum gg.auges, wcre atta4;hcd to each of the <br /> monitostn4v welts Mcasurenients were rewrded at regular vitervals throughout the twt and are <br /> irickided in Table 3 Field sheets are included in Appendix C- <br /> 4 3 GoLLECTION AND ANALYSIS OF AMSAMPLES <br /> A total of four air samples were collected at two-h= intervals from the inlet of the extrrtctiori <br /> well to nwasure concentrations of extracted hydrocarbon vapor The samples were collected in <br /> Tedlar bark.s using a.PID as an air pun1p The samples were trans rafted under chaun-of-c stodty to <br /> sn Pad , Califomia Mach sample was "y=d <br /> 72 <br /> McCamplYell Arratyteca9 Inc (MAi) <br /> hours for TP14-3 and II"�&.X so accordance with EPA methods 8a15m and SM. respectively <br /> 4 4 RFSUL IS OF VApoo EXTRACTION PILOT TEST <br /> The induced vacuum was incaswed in MW-1, MW-2, MW-3 acrd MW-4 The greatest vaeslLtizs <br /> was measured in I 1, Wrox.I�mstely 14 feet from VW-I VacuLam meAwrement Tinged from <br /> 190 tittchcs to 2 15 <br /> inches(lH30)sn that well Low vacuums were measured in MW- gird lul -4 <br /> at the bc;innsn-m and enol orthe test However. law pressures were measured during most of the <br /> TOTAL P 61 <br />