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l <br /> 1386 EAST BEANdER STREET <br /> WAGE ESTERN WOODLAND, CA 95776-6003 <br /> GE4-LENGINERS ` • 7�1 FAX (916) 662-0273 <br /> CALIF CONTRACTOR #513857 A CORPORATION r (91b) 665-5300 <br /> REGISTERED GEOLOGISTS <br /> October 2, 1997 <br /> Mr Anthony Mendes <br /> Manager Permit Services <br /> San Joaquin Valley Unified Air Pollution Control District <br /> 4230 Kiernan Avenue, #130 <br /> Modesto, CA 95356 <br /> (209)468-0337 <br /> FAX (209) 545-8652 <br /> RE Discontinue Permit to Operate #N-1090-3-1 at the EXXON Station (Former Regal Station <br /> R603), located at 6425 Pacific Avenue and Douglas, Stockton, California <br /> Dear Mr Mendes <br /> Wickland Properties is currently operating a vapor extraction system for soil and groundwater <br /> remediation at the above-mentioned site Activated carbon units (four in series 110-gallon units with <br /> approximately 400 lbs of carbon each) have controlled the emissions The system was shut off last <br /> week, 11 00 AM September 25, 1997 Samples were obtained from the influent to all carbons and <br /> the exhaust of the last carbon (carbon #4) and Chain of Custody (COC) delivered to a DHS certified <br /> laboratory for analysis of TPHg, BTEX The influent sample shows all analytes tested to be below <br /> laboratory lower detection limits The effluent sample showed trace amounts of toluene at 2 6 ug/L, <br /> ethyIbenzene at 0 9 ug/L and xylenes at 9 ug/L, see Field Notes and Laboratory Report <br /> Weekly sampling and field screening of the influent and effluent of the carbon system show that the <br /> #2 and #3 carbons have loaded with gasoline range hydrocarbons, the #4 carbon has started to load, <br /> while the #1 carbon has been purged by the relatively clean influent vapor stream The influent <br /> vapor stream has not exceed two pounds per day since May 1996, since August 14, 1997 it has not <br /> exceeded 1 3 pounds per day Currently the influent stream is less than 0 5 pounds per day at an <br /> average flow rate of 65 efin, see Table (labeled Table 2) and two unnumbered Charts <br />