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rte— <br /> f <br /> 1 <br /> 3^ <br /> TECNNOLOG)E5,INC- _.,------ <br /> 269 Ablint Hermon Rd. <br /> suite 101 <br /> 408143 valley, <br /> A 5065 <br /> FAX(408}438.7515 <br /> s 11 February 1991 <br /> I' Mr, Glenn Dembraff <br /> Ultramar Inc. <br /> 525 West Third Street <br /> Harford, California 93234 <br /> SUBJECT: Beacon Station <br /> t 92, 470 North Main Street, <br /> Manteca, California <br /> Bear Mr. Dembroff: <br /> Inc. (EVAX) is pleased to submit this summation of <br /> EVRX Technologies, VAX at the request of Ultramar inc. <br /> remediation efforts performed by � rovides an Overview of <br /> (Ultramar) at the subject site. This report p equipment, <br /> its operation <br /> remediation ce,efforts, <br /> thedsystemtion of the monitoring programstem equip <br /> and maintenance, <br /> OVERVIEW <br /> d at <br /> Streets in Manteca, California. A uly 9891 <br /> The subject site is an and Beacon service station Ionia. A the <br /> corner of !North Main an EI AX on 2 <br /> Gas Survey and Performance Test were conducted by <br /> he <br /> our wells <br /> Hydrocarbon concentration as vapor was re�cidedoft the fPerformance SeTest <br /> the subsurface investigation. Theto <br /> indicated <br /> that the soiltconditions ioninstallation re awasacompletedapin August 1989' <br /> ion <br /> The vapor extraction Y was 23,150 parts per <br /> operation began on 13 October 1�89as The <br /> arj(TVFi)�nfluent cancentratted <br /> of total hydrocarbon concentration The combustion unit operated <br /> million (ppm) or 85 pounds per day• per day. A summary <br /> continuously for 34 1/2 days, 24 hours p was taken at the site on 17 <br /> data is enclosed. A final reading pounds per <br /> monitoring Influent concentration was 1,970 ppm or 22 oXimately <br /> November 1989. 17 <br /> day. The combustion unit was re e�dd °eXtracted e�and ber labated 989. Rpduring the <br /> 2,000 pounds of hydrocarbons <br /> remediation project. <br /> - - --- - <br /> SYSTEM EQUIPMENT <br /> and----an - --- -- -- —;-- <br /> ine <br /> The <br /> system equipment includes an iaserntheal c�combustor-enunit, a <br /> unit, collectively referred to <br />