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Mr Chuck Carmel <br /> October 14 1993 <br /> Page 4 <br /> extrapolation of radius of influence measurements collected during the original vapor <br /> extraction test in 1990 Radius of influence was not measured during the March 1993 <br /> Sampling of vapors <br /> The OROI is based on conservative assumptions related to soil venting These conservative <br /> assumptions are (1) the Soil venting from individual wells do not influence neighboring <br /> wells, or to be more specific the influence on individual wells from Soil vapor extraction is <br /> not cumulative (2) radius of influence is based on vacuum pressures that are at. or above <br /> 0l-inch water column and (3) biological degradation of gasoline hydrocarbons is not <br /> enhanced in the vadose zone outside the vacuum pressure area that is detined by less 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 monitored <br /> by tield 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 tuture 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) 444-0123A if you have any questions regarding this quarterly <br /> report <br /> Sincerely <br /> B AND CALDWELL <br /> Ltic v4 <br /> J y Lucas, R G #4301 <br /> Project Manager <br /> JCL lk <br /> Enclosures <br /> LL Mr Gordon Boggs, Calitornta Regional Water Quality Control Board <br /> Ms Laurie Cotulla. San Joaquin County Local Health District <br /> Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this <br /> ducuJnent 7846\REP0RT,%%MAY93QTR RpT <br /> Brown and Caldweii <br />