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GROUND ZERO ANALYSIS, INC. ✓' <br /> 1714 Main Street <br /> Escalon, California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-98$3 nDECOVED <br /> 3 2006 <br /> March 1,2006 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SE"CES <br /> San Joaquin Valley Unified Air Pollution Control District <br /> 4800 Enterprise Way <br /> Modesto, California 95356 <br /> Attn: Mr. Jim Swaney <br /> Subject: Request for Permit Modification, Soil Vapor Extraction System <br /> Speedy Foods, 8200 N. Highway 99, Stockton, CA <br /> Permit to Operate No. N-6574 <br /> Dear Mr. Swaney: <br /> Ground Zero Analysis, Inc. (Ground Zero) is writing to request modifications to the soil vapor <br /> extraction system at 8200 N. Highway 99, Stockton, California (Permit to Operate No.N-6574). <br /> The soil and groundwater remediation project is served by .a 0.5 MMBTU/hr Solleco Model <br /> 400TCAT (LR) LPG-fired thermal/catalytic converter. Ground Zero operated the unit in thermal <br /> oxidizer mode between August 3, 2005 and November 4, 2005, at which time the unit was shut <br /> down pending conversion to catalytic oxidizer mode. .The conversion was completed on <br /> November 22, 2005 and the system has operated in catalytic oxidizer mode from November 22, <br /> 2005 to the present. <br /> Initial vapor concentrations in the influent sample collected on August 8, 2005 measured 5,100 <br /> µglL TPHg, and the vapor extraction system removed approximately 1 721 <br /> pounds ofgasoline through November 4, 2005, an average of approximately 30.7 pounds per day during operation in <br /> thermal oxidizer mode. The influent vapor sample collected September 12, 2005 contained <br /> TPHg at 11 pg/L. Since November 22, 2004, the vapor extraction system removed <br /> approximately 145 pounds of gasoline, an average of approximately 2.0 pounds per day during <br /> operation in catalytic oxidizer mode. Recent analytical results and PID readings of influent <br /> samples indicated that the hydrocarbon removal rate has averaged less than one pound per day of <br /> operation since January 9, 2006 (please see Table 1). <br /> Ground Zero is currently operating the unit in pulsed extraction mode, wherein the system is idle <br /> for 2 weeks, then extracts vapor for 1 week and repeats the cycle. Based upon the last month of <br /> operation, less than one pound per day of hydrocarbons are extracted from the subsurface (please <br /> see Figure 1). As currently configured, the system utilizes approximately 25 gallons of LPG per <br />