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``tt 11 <br /> +V _J -11 J <br /> KAPREALIAN ENGINEERING <br /> I N C Q R P O A A T E D <br /> KEI-P91-0202 .R7 <br /> March 18 , 1993 <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> P.O. Box 5155 !� n <br /> San Ramon, California 94583 U <br /> Attention: Mr. David DeWitt MAR 3 01993 <br /> RE: SESOIL Vadose Zone Computer Modeling Report ENVIRONMENTAL HEALTH <br /> Unocal service Station , 6015 PERMIT/SERVICES <br /> 501 East Kettleman Lane <br /> Lodi , California <br /> Dear Mr. DeWitt: <br /> This report presents the results of the SESOIL Vadose Zone <br /> Contaminant Fate and Transport Model that was performed using data. <br /> collected from previous site investigation activities at the <br /> subject site. <br /> The subject site contains a Unocal service station facility. Three <br /> underground fuel storage tanks , one waste oil tank, and the product <br /> piping were removed from the site in February of 1991 during tank <br /> replacement activities . The fuel tank pit was subsequently <br /> overexcavated in order to remove contaminated soil . Nine monitor- <br /> ing wells and two exploratory borings have been installed at the <br /> site. A ground water monitoring and sampling program was initiated <br /> in September of 1991. <br /> A site description, detailed background information including a <br /> summary of all of the soil and groundwater subsurface investiga- <br /> tion/remediation work `conducted to date, site hydrggeologic <br /> conditions, and tables that summarize all of-"' the soil and ground I <br /> water sample analytical results are presented in - Kaprealian <br /> Engineering Incls . (KEI) quarterly report (KEI7P91-0202 .QR1) dated <br /> May 4 , 1992 . <br /> SESOIL - BACKGROUND INFORMATION <br /> i <br /> SESOIL is a seasonal soil compartment model that estimates the rate <br /> of vertical chemical transport and transformation in the vadose <br /> zone. SESOIL is capable of analyzing chemical transport in terms <br /> of mass and concentration distributions among the soil, water, and <br /> air phases in the unsaturated soil zone. The soil column is <br /> defined as a compartment which extends from the soil surface <br /> through the unsaturated zone to the ground water table. By <br /> analyzing this soil column, a determination can be made as to <br /> 2401 Stanwell Drive,Suite 4110 <br /> Concord,California 94520 <br /> Tel:510.602.5100 Fax:510.61i7.0602 <br />