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AEGIS ENVIRONMENTAL , INC . <br /> 1050 Melody Lane, Suite 160, Roseville, GA 95678 + 916. 782-2110 1916-969-21101 FAX 916.786-7830 <br /> December 23, 1992 411-n- � � � <br /> �V " � <br /> DEC 2 8 1992 <br /> ENVIRONW-WAL HFAON <br /> Mr Kai Chan PERMIT/SERVICES <br /> San Joaquin Valley Unified <br /> Air Pollution Control District <br /> 4230 Kiernan Avenue, Suite 130 <br /> Modesto, California 95356 <br /> Subject System Status <br /> Soil Vapor Extraction and Emission Control System <br /> Shell Service Station <br /> . 620 West Charter Way, Stockton, California <br /> Air Permit to Operate No 91-471 <br /> I <br /> Dear Mr Chan <br /> On behalf of Shell Oil Company, Concord, California, Aegis Environmental, Inc (Aegis), <br /> is operating a soil vapor extraction system with thermal/catalytic oxidizer emissions <br /> control (system) at the subject site <br /> The purpose of this letter is to provide San Joaquin Valley Unified Air Pollution Control <br /> District (APCD) with data collected during the system startup and the first 2 weeks of <br /> operation This letter also includes Aegis's interpretation of the data collected <br /> The system operation commenced in the thermal oxidizer mode on September 17, 1992, <br /> after system inspection by the APCD personnel Vapor samples were collected <br /> (approximately 2 hours after system startup) from the thermal oxidizer influent (influent) <br /> and stack (effluent) for laboratory analysis of benzene, toluene, ethylbenzene, total <br /> xylenes (BTEX) and total petroleum hydrocarbon (TPH), as gasoline, concentrations <br /> Following system monitoring, additional site visits were conducted on September 22, 24, <br /> and October 1, 1992, during the first 2 weeks of system operation <br /> 91 246F LTR <br /> GEOLOGISTS • ENGINEERS • GROUNDWATER SCIENTISTS <br />