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P 0roll) <br /> Subsurface Investigation and Page 10 <br /> Remedial Excavation of Hydrocarbon-affected Soil <br /> Proposed Cintra Park Phase II Development, Tract 2705, Tracy, California <br /> F August 8, 1997 CTE Job No. 20-0445 <br /> } 6.0 RECOMMENDATIONS <br /> i <br /> No further action is recommended at this time. The remaining volume of hydrocarbon-affected soil <br /> appears to be limited to small areas in the western and southwestern portion of the excavations. <br /> Additionally,the hydrocarbon sources(the UST and the vast majority of hydrocarbon-affected soil) <br /> k . <br /> have been removed. Furthermore,as indicated the site grades will be raised approximately eight to <br /> ten feet above current grades. Once this work is completed the small remaining volumes of <br /> } hydrocarbon-affected soil will be buried at approximate depths of 16 to 18 feet below the ground <br /> -, level. <br /> FAdditionally, recent work by Lawrence Livermore Laboratories (1995) showed that groundwater <br /> r_- contamination in alluvial soils(generally similar to those at the site) typically does not spread great <br /> distances laterally before undergoing degradation by natural bacteria in the soil. <br /> 7.0 LIMITATIONS OF INVESTIGATION <br /> i . <br /> The samples taken and used for testing and the observations made are believed to be representative. <br /> � E <br /> However, soil and geologic conditions and contamination can vary significantly between exposures. <br /> ri <br /> FThe findings of this report are valid as of the present date. However, changes in the conditions of a <br /> property can occur with the passage of time, whether they are due to natural processes or the works <br /> of man on this or adjacent properties. In addition,changes in applicable or appropriate standards may <br /> F1 40. <br /> FAPROJECTs120-0MRP02.WPD <br />