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TECHNOLOGIES,INC. <br /> i <br /> 269 Mount Hermon Rd. <br /> suite IN <br /> Smus Vaft,,Ca 950&8 <br /> (406)438.7511 <br /> FAX(408)438.7515 7 <br /> 5 September 1991 <br /> SEP 9 1991 <br /> ENV;ROMvIENTAL.HEALTH <br /> Ms. Debbie HarrisPClZoEfi4iC::5 <br /> Exxon Company, U.S.A. <br /> P.O. Box 4415 <br /> Houston, Texas 77210-4415 <br /> SUBJECT: Vacuum Extraction System <br /> Exxon Station RS #7-1050, <br /> Stockton, California <br /> Dear Ms. Harris: <br /> The system was monitored on 13 August 1991 at the subject site. The <br /> results are presented in ttie attached table for your. review. Also <br /> enclosed is a copy of the laboratory report. <br /> Between S H rch and 13 August 1991, approximately 1,262 pounds of <br /> hydrocarbons and 60 pounds of benzene were removed from the soil . The <br /> vacuum extraction module was fitted with new pulleys by our field <br /> technicians which increased the system vacuum from 5.25" Hg to 10" Hg. <br /> Both ambient dilution and recirculation valves are fully closed to <br /> maximize extraction efficiency. The catalytic incinerator operating <br /> temperature has been set at 800OF in order to insure acceptable <br /> destruction efficiency levels in the catalytic module. <br /> Please do not hesitate to call if you have any questions. <br /> Sincerely, <br /> EVAX Technolegit:s, Inc. <br /> Shaw Garak ni <br /> Project Engineer <br /> cc: Mr. Harlin Knoll , San Joaquin County Environmental Health <br /> Department <br /> covF114.dcx <br /> f <br /> NINE <br />