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CADI LLAC - FAI RVI EW <br />October 8, 1981 <br />Page Two Our Job 81-20-10 <br />and concrete rubble. The reference provides a more detailed <br />description of site conditions prior to the start of the grading <br />discussed in this letter-report. <br />SITE GRADING <br />The building area plus five feet around the perimeter <br />of the buiLding, as determined by the contractor, was stripped <br />of existing unengineered fill to expose natural soil consisting <br />of silty sand. The depth of stripping varied from three to <br />five feet. The stripped rnaterial was stockpiled for use as fill <br />after processing. Soil imported to the site for use as fill <br />was classified as sand and silty sand. <br />Prior to placement of fill on the pad, the areas to <br />receive fill were scarified, moisture conditioned and compacted <br />to at least 90 percent of the laboratory determined naxinum dry <br />density. Fi11 material was then placed in thin 1ifts, moisture <br />conditioned and conpacted. The rnaximum depth of fill placed on <br />the pad was approxinately nine feet. <br />UTILITY TRENCH BACKFILL <br />Utility trenches being excavated outside and within <br />the building area are being backfilled subject to periodic ob- <br />servation and testing by representatives of this office. The <br />approximate location of utility trenches within building area back- <br />filled under our observation and testing are shown on Plate 1 - <br />Plot Plan.