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'' <br /> t <br /> January 5, 1991 <br /> Mr. john Margowski <br /> Environmental Director <br /> Wickland properties i <br /> 1765 Challenges Way <br /> Sacram921�11Q0 <br /> 5815 <br /> (916) Station 503 <br /> - 5ource Test for vapor extraction, former Regal <br /> RE: 6425 pacific Avenue, Stockton, California. <br /> (EXXON) r <br /> Dear Mr, Margowski: <br /> INTRODUCTION of the s°•�rce test <br /> This letter documents the sc <br /> va or extraction into activated charcoal. at the above <br /> heduled star uP <br /> far P <br /> mentioned site. <br /> PILOT TEST to exist beneath the <br /> drocarbons are known excavation was <br /> Gasoline range by tanks area. The tank 3, 1.991, <br /> undergound storage depth on January <br /> overexcavated to the 26 foot <br /> gallon tub scrubs were delivered <br /> was <br /> activated charcoal inyc two <br /> 8 27-28, 1990, monitor <br /> the site, begin. <br /> which time the test will g <br /> manifolded to the treatment area. The blower rill be installs o <br /> �# January 7, 1991, at <br /> TEST PRCCEDURES one week or until break <br /> proceed for a duration of EX2 <br /> The test will p or extraction wells EBl <br /> through, which ever occurs firatvacaum system (1HP Rotron Blower) <br /> and MW 10 will be connected to <br /> tub scrubs. <br /> that <br /> exhausts into two 85 gallon activated charcoal <br /> at ei <br /> Sample ports will be installed at thehinfluentl to fbthe nblower for <br /> vacuum and temperature readings, and at the exhaust of <br /> temperature monitoring p sample port <br /> samples, vacuum and temp tub scrubs for <br /> the blower for pressure and temperature monitoring <br /> erature readings. The exhaust of the <br /> will also be located on the exhaust of the charcoa breakthrough <br /> samples, pressure and temp that has been <br /> tub scrubs will be checked on alternate <br /> using a hand held photoionizing Once breakthrough occurs <br /> calibrated to 50 ppm Isobutylene in air. <br /> 3 <br />