ARCHIVED REPORTS XR0001139 - Laserfiche WebLink

Home Browse Search

i EEL i H 1050 Melody Lane, Suite 160, Roseville, California 95678 mo 7a22110 Fax(996)786 830 EGI ENVIRONMENTAL, INC. Or November 24, 1993 Linda Turkette San Joaquin County, Public Health Services P O Box 2009 Stockton, California 95201 Subject System Operation Summary Soil Vapor Extraction and Emission Control System Shell Service Station 620 West Charter Way, Stockton, California Air Permit to Operate No 91-471 Dear Ms Turkette On behalf of Shell Oil Company, Concord, California, Aegis Environmental, Inc (Aegis), is operating a soil vapor extraction system with thermal/catalytic oxidizer emissions control (system) at the subject site (Figure 1) This letter provides a brief summary of system description, operation (September 17, 1992 -September 1 , 1993), sampling/monitoring results, and a discussion that includes that the limits of vapor extraction may be nearing soon Currently, the system is in a "pulsing " mode of operation System pulsing commenced on September 1, 1993 Pulsing consists of intermittent operation (on/off cycles) to maximize hydrocarbon recovery due to low influent concentrations to the oxidizer System Description The system consists of seven vapor extraction wells manifolded to a soil vapor extraction and thermal/catalytic oxidizer emission control unit (Model VAC 25 ) manufactured by Thermtech Inc The oxidizer is natural gas-fired with an airflow capacity of 250 standard cubic feet per minute (scfm) Vapors extracted from combination ground water monitoring/vapor recovery wells MW-2, MW-3, MW-4, MW-5, MW-7, MW-8, and MW-9 are treated by the thermal/catalytic oxidizer prior to discharge to the atmosphere (Figure 2) System operation and monitoring is performed consistent with the air permit issued by the San Joaquin Valley Air Pollution Control District (APCD) 91 246J LTR