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5 <br /> a � <br /> Mr Chuck Carmel <br /> iFebruary 14, 1994 <br /> Page 4 <br /> enhanced in the vadose zone outside the vacuum pressure area that is defined by Iess than <br /> 0 1-inch water column <br /> The SVETS will continue to be operated in a manner designed to remediate soil and soil <br /> vapors effectively and quickly by <br /> • Concentrating extraction from areas with highest concentrations in vapor, as <br /> monitored by field instruments and periodic laboratory analyses of air samples <br /> • Maximizing influent concentration to the catalytic oxidizer Influent air samples are <br /> collected monthly and used to evaluate this criteria <br /> • Maintaining an OROI in area of known soil contamination <br /> Anticipated future operational changes to the SVETS are pulsing of one or more wells, using <br /> one or more wells as passive air vents, and rotating operating wells <br /> Please contact me at (916) 444-0123 if you have any questions regarding this quarterly report <br /> Sincerely, <br /> BROWN AND CALDWELL <br /> 1 k <br /> 6 <br /> Matt Turner Jay Lucas <br /> Project Manager California Registered Geologist #5301 <br /> MTT JCL lk <br /> Enclosures <br /> cc Mr Gordon Boggs, California Regional Water Quality Control Board, <br /> Central Valley Region <br /> 11 L3iide-- zultl San Joaquin County Local Health District <br /> Use or dreclosure of data contained on this 31reet is subject to the restriction specified at the beginning of rhes <br /> document 7384RREPQRTSIAUC93 QTR RPC <br />