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Aunust 28, 1991 BALBI&CHANG ASSOCIATES <br /> File No. 1525-69 <br /> resistance value (R-value). Since site soils have a very low soil resistance value ( R=5), lime <br /> treating the proposed pavement subgrade will increase its R-value and reduce the pavement <br /> section thickness. <br /> The canopy and facility sign, because of the possibility of up-lift and overturning failure, may <br /> be supported on either deepened footing or drilled pier foundation system. Since these deep <br /> foundations will penetrate the surficial high plastic soil, the expansion pressure should not <br /> have significant effects on these types of foundation. <br /> The optimum moisture content of the near surface site soil, as developed from the moisture - <br /> dry density relationship curve, is 16.5 percent. Comparing the in-situ soil moisture content <br /> to the optimum moisture content, we found the in-situ soil moisture is 4% to 8% over the <br /> optimum. The high moisture content of the near surface soil obtained from TB-4 may not <br /> represent the normal condition of the site soils because of the recent watering activities. <br /> Generally, slightly reducing the site soil moisture is necessary during site grading. However, <br /> if lime treatment is used for this site, the existing moisture contents of the surficial site soils <br /> may be considered as within the workable range. <br /> Based upon the results of our study, it is our opinion that the site may be developed for the <br /> proposed development from a geotechnical engineering standpoint. Detailed design and <br /> construction recommendations for foundation system and other geotechnical engineering <br /> related items are presented in the following sections of this report. <br /> IV. RECOMMENDATIONS <br /> A. Site Preparation and Grading <br /> Grading plan for the project is not available at the time this report was prepared. Since the <br /> site is relatively flat, we therefore assume that the proposed buildings will be constructed at <br /> or near the existing ground surface. Based on this assumption, we recommend that the upper <br /> 2 feet of the near surface material underneath the proposed Mini-Market building be <br /> overexcavated and mixed with sufficient quantity of quicklime or hydrated lime during site <br /> grading. Because of the individual soil characteristics, the optimum amount of lime mixed <br /> into the soil generally ranges between 3% and 6% by the weight of dry soil. The actual <br /> optimum amount of lime used for this site should be determined by the laboratory test results. <br /> Pate 5 of 17 <br />