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„ �; �..r ' � v w - �e, *Q�;,�.-ro err � �'--` s'�• AMIEN <br /> b: <br /> - _ . <br /> BE <br /> x <br /> January 31, 1991 <br /> PROJECT 02510.01 <br /> E : <br /> INTRODUCTIQN <br /> At the request of Ultramar Inc. (Ultramar), <br /> a subsurface investigation <br /> was conducted ataAnthe <br /> rocedures,ect site. <br /> the rasultsrof thepresents <br /> GasaSurveyiandon of <br /> the investigation P <br /> ” Performance Test, an interpretation of the results, and conclusions base <br /> on these findings. <br /> A. <br /> BACKGROUND <br /> The subject iUltramarlocated <br /> 800East <br /> environmentalnvestig4wooras <br /> 12 in Lo California, <br /> k has <br /> Of <br /> ina <br /> been perfoed at the <br /> terrmonitoringuwelldsrinl <br /> rmthe boreholes.soil borings <br /> ded <br /> and installation of g <br /> vapor extraction system has been <br /> installed <br /> and onsperated at the site to <br /> remedia e soils impacted by petroleum hydr . <br /> PURPOSE AND SCOPE <br /> The objectives of this investigation were to 1) define the extent of <br /> hydrocaroons remaining in the soil and determine the evaluate theity <br /> areafeasibilof tof <br /> concentrations of hydrocarbon vapors and 2) <br /> using vaporeexttraction for soil the rem <br /> mpdiationoata tSoiluGas cSurvey and <br /> hese <br /> objective w <br /> Performance Test. <br /> dered <br /> All data collected intothis <br /> tinvest <br /> arty�wnthGutcthe�written oconsent�al d <br /> of an <br /> will not be released <br /> rd p <br /> authorized representative of Ultramar. <br /> PROCEDURES <br /> Soil Gas Survey <br /> The Soil Gas Survey was conducted January 29 and 3O, 1991 at the subject <br /> qere <br /> site. Twenty-one existing groundwaterw monitoring <br /> mit rinanalyg wellsd for totaluvolatilethe <br /> --- — <br /> - - -- - - <br /> — investigation (ftgur - -- - <br /> hydrocarbons (TVH) during the Soil ) ddelineatetthe)extent nofoTVH the- <br /> hydrocarbons <br /> presence of hydrocarbon vapor and 2) <br /> soils at the subject site. <br /> A vacuum was applied to each wehet analysis. oilextrctsSample flownrate�and <br /> mple <br /> pressure was maintained during <br /> instrument pressures were checked before each test. The soil gas was <br />