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l <br /> KLEINFELDER <br /> File No.: 20-3304-01 <br /> February 1, 1990 <br /> Page 7 ' <br /> submitted to the soils engineer for approval prior to being taken to the site. <br /> Engineered Fill should be placed in horizontal layers a maximum of 8 inches in loose <br /> thickness and be compacted to a minimum of 90 percent of the maximum dry density <br /> as determined by the ASTM D-1557 test procedure. <br /> We recommend that structural and trench backfill be placed in the same manner as <br /> Engineered Fill. In our opinion, trench backfills outside building areas may be jetted. <br /> However, if jetting is performed, sufficient time should be set aside to allow <br /> consolidation to occur. In addition, density tests should be taken to confirm the <br /> recommended compaction. <br /> In areas to receive asphaltic concrete, we recommend that the subgrade soils to a <br /> depth of at least 6 inches be compacted at near optimum moisture content to a <br /> minimum of 95 percent of the referenced test dry density. <br /> Percolation Test <br /> The percolation test hole was drilled at the same time our geotech investigation <br /> was performed. The test hole was excavated to a depth o 3J low the ground <br /> surface and P.V.C . Perforated pipe was inserted the length of the hole. Two inches <br /> I of clean sand was placed in the bottom of each hole to prevent disturbance when <br /> adding water. Twenty-four hours prior to performing the test, the test hole was <br /> filled with relatively clean water and left to soak overnight. <br /> On February 6, 1990 a representative of our firm returned to the site to perform the <br /> percolation test. The test was performed according to San Joaquin County guidelines. <br /> The result of the percolation test indicated a rate of(34 minutes per inch. For your <br /> information, a copy of our county approved percolation test is attached to the end of <br /> this report. <br /> L <br /> 1 <br /> � I <br />