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. . , ,•, s,.... ,4L. , E <br /> C } <br /> rL+ <br /> itwAt I <br /> E <br /> CONDOR EARTH TECHNOLOGIES INC. <br /> 1125 No Golden State Blvd 21663 Brian Lane <br /> Suite H PO Box 3905 <br /> PO Box 3448 Sonora, CA 95370 <br /> July 2, 1996 Turlock, CA 95381 (209)532-0361 <br /> FAX1(668-9234 2 9 668 9248 FAX (209)532-0773 <br />' ABIs Mary Meays <br /> San .Joaquin County <br /> Environmental Health Division <br /> 304 East Weber <br /> Stockton, CA 95201 <br /> RE Idlewild Market, 3049 Highway 12, Lodi, California <br /> SUBJECT- Addendum, SESOIL Modeling Results,Fate and Ti ansport within the Vadose Zone, <br /> Iprepared by Condor Earth Technologies, dated May 23, 1996. <br /> Dear Mary <br /> As you requested, 1 have prepared the following (A) SESOIL model runs for toluene and xylene <br /> at volatilization 0 2 with no biological degradation rate and (B) references for BTEX biodegradation half- <br /> I lifes I have also included the ethyl benzene run that I prepared during our conversation last week <br /> (volatilization 0 0 with no biodegradation rate), and a 30 year xylene run with a biodegradation rate of <br /> 1% of the published rate and volatilization set at 0 2 In addition, foi your general use, 1 have included <br /> an article titled "A Practical Approach to Evaluating Natural Attenuation of Contaminants in <br /> Groundwater", McAllister and Chiang 1994 <br /> SESOIL MODELING RESULTS <br /> Toluene <br /> IToluene was modeled using a 25 year simulation with volatilization set at 0 2 and without .applying a <br /> biological degradation rate SESOIL predicted that it would take approximately 12 to 16 years for toluene <br /> to teach the capillary fringe under the conditions described above The predicted peak concentration of <br /> toluene at the capillary fringe is 0 6 µg/ml dissolved, 0 3 Vig/g adsorbed, and 0 18 µg/cm3 air in pores (see <br /> Toluene, attached) The primary maximum contaminant level (MCL) for toluene, as defined in the <br /> California Code of Regulations, Title 22, Drinking Water Regulatory Criteria, is 0 15 µg/ml <br /> Ethyl Benzene <br /> Ethyl benzene was modeled using a 100 year simulation with volatilization set at 0 0 and without applying- <br /> a degradation rate SESOIL predicted that it would take approximately 30 to 45 years for ethyl benzene <br /> to reach the capillary fringe under the conditions described above The predicted peak concentration of <br /> ENVIRONMENTAL • GEOLOGICAL • ENGINEERING • GEOTECHNICAL <br /> I <br />