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r�vironmental Restoration Services <br /> 2.3 Excavation Backfill <br /> On December 14th through the 17th, of 1995, the lower portions of the excavation was <br /> backfilled with approximately 750 yards of clean imported pea gravel material to within <br /> fourteen feet of the surface. The clean overburden soil was then used to complete the <br /> excavation backfilling to a depth of six feet below the ground surface. <br /> 3.0 CONCLUSIONS <br /> It appears from the excavation sidewall sample results that most of the contaminated <br /> soils were excavated in the vicinity of the sampled area, to a depth that advanced <br /> approximately 10 feet into the aquifer. <br /> LIMITATIONS <br /> The observations and conclusions presented in this report are professional opinions based <br /> on the scope of work outlined herein. This report was prepared in accordance with <br /> generally accepted standards of environmental geological practice in California at the time <br /> this investigation was performed. The opinions presented apply to site conditions existing <br /> at the time of our study and cannot apply to site conditions or changes of which we are not <br /> aware or have not had the opportunity to evaluate. This investigation was conducted solely <br /> to evaluate environmental conditions of the soil and groundwater with respect to <br /> hydrocarbons identified during previous work. Evaluation of the geologic conditions at the <br /> site for the purpose of this investigation is made from a limited number of observation <br /> points. Subsurface conditions may vary away from the data points available. Additional <br /> work, including subsurface investigation, can reduce the inherent uncertainties associated <br /> with this type of investigation. It must be recognized that any conclusions drawn from these <br /> data rely on the integrity of the information available at the time of investigation and that a <br /> full and complete determination of environmental contamination and risks cannot be made. <br /> Respectfully submitted this 24th day of January, 1995 <br /> Bennett T Halsted S muel H. Halsted PE <br /> Project Manager C.E. 1409 <br />