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q <br /> 1 <br /> WHNOLOGIES,INC. <br /> A694 Mount Neuron Rd: <br /> s0e 101 <br /> soon val16y;CA 9.W <br /> (40b)476.7511 <br /> FAX(408)438.7315 <br /> 1I February 1991 <br /> i Mr. Glenn 7embroff <br /> Ultramar Inc. <br /> 525 Nest Third Street <br /> {{� Hanford, California 93230 <br /> t <br /> SUBJECT: Beacon Station #0492, 470 North Main Street, <br /> Manteca, California <br /> r <br /> Dear Mr. Oembroff: <br /> EVAX Technologies, Inc. (EVAX) is pleased to submit this summation of <br /> remediation efforts performed by EVAX at the request of Ultramar Inc. <br /> r <br /> (Ultramar) at the subject site. This report provides an overview of <br /> J remediation efforts, a description of the system equipment, its ope0ition <br /> and maintenance, and the system monitoring program. <br /> y <br /> OVERVIEW <br /> The , subject site' is an operating Beacon service station located at the <br /> corner of North Main and Alameda Streets in Manteca, California. A Soil <br /> Gas . Survey and Performance Test were conducted by EVAX an 25 July 1989, g <br /> Hydrocarbon concentration as vapor was recorded at the four wells used in. } <br /> rzR the subsurface investigation. The results of the- Performance Test <br /> " indicated that thy3. soilconditions were amenable to vapor' extraction. <br /> The vapor extraction system installation was. completed in August 1989. <br /> Operation ' began on 13 October 1989. The initial influent concentrate-Jn <br /> of total hydrocarbon concentration as vapor TVH was `23 150 <br /> .million P (TVH) parts per �. <br /> z� (ppm) or 85 pounds per day. The combustion unit operated <br />, 4 <br /> continuously, for 34 1/2 clays, k4 hours per day. A summary of the !! <br /> . ' monitoring data is enclosed. A final reading was taken. at the site on 17 S <br /> November 1989. Influent concentration was 1,970 ppm or 22 pounds per ; <br /> day. The combustion unit was removed on 17 November 1989. Approximately <br />{x <br /> 2,000 pounds of . hydrocarbons were extracted and abated during the i <br /> rt remediation project: E_ <br />.--� � —�-- -- - ----- ;-:-5YSTEFi'EQUIPMENT- � -- <br /> e r The system equipment . includes an internal combustion engine andP um f <br /> unit, collectively referred to, as the combustor unit, and an <br /> V <br /> r <br />� <br /> 5 4r <br /> Vs <br />