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20f• �v�1 � <br /> .cf w' �,W,�7{ ga <br /> Td <br /> •7�{, •� d� ,. ',S .�, � " i;1 k <br /> n <br /> M <br /> January 5, 1991 <br /> Mr. John Kargowski <br /> Environmental Director <br /> Wickland Properties <br /> 1765 Challenge Way <br /> Sacramento, CA 95815 <br /> (916) 921-1100 ti;} <br /> RE; Source Test for vapor extraction, former Regal Station 603 �3 <br /> (EXXON), 6425 Pacific Avenue, Stockton, California, <br /> Dear Mr. Margowski: <br /> INTRODUCTION <br /> This letter documents the scheduled start up of the source test <br /> for vapor extraction into activated charcoal at the above <br /> mentioned site. <br /> PILOT TEST <br /> Gasoline range hydrocarbons are known to exist beneath the <br /> undergound storage tanks area. The tank excavation was <br /> overexcavated to the 26 foot depth. On January 3, 1991, � <br /> :J <br /> activated charcoal in two 85 gallon tub scrubs were delivered to <br /> the site, and on December 27-28, 1990, monitor well MW10 was „ <br /> manifolded to the treatment area. The blower will be installed on {{ <br /> January 7, 1991, at which time the test will begin. fr <br /> TEST PROCEDURES <br /> The test will proceed for a duration of one week or until break <br /> through, which ever occurs first, Vapor extraction wells EX1, EX2 <br /> and MW10 will be connected to a vacuum system (1HP Rotron Blower) <br /> that exhausts into two 85 gallon activated charcoal tub scrubs. <br /> Sample ports will be installed at each well to obtain samples, <br /> vacuum and temperature readings, at the influent of the blower for <br /> samples, vacuum and temperature monitoring and at the exhaust of <br /> the blower for pressure and temperature monitoring. A sample port <br /> will also be located on the exhaust of the charcoal tub scrubs for <br /> samples, pressure and temperature readings. The exhaust of the <br /> tub scrubs will be checked on alternate days for breakthrough <br /> using a hand held nhotoionizing detector (PID) that has been <br /> calibrated to 50 ppm Isobutylene in air. Once breakthrough occurs <br />