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CASCADE GEOTECHNICAL <br /> October 28, 1985 <br /> Cert. No. 8510-14G <br /> Skippers Inc. <br /> Page 4 <br /> value of 2000 psf. These bearing values are based on the assump- <br /> tion that no footings will be less than twelve ( 12) inches wide and <br /> that eighteen ( 18) inches of cover is maintained for frost protec- <br /> tion. Roof drains should be tightlined away from the foundation. zo <br /> � <br /> ., <br /> � <br /> m <br /> Slab on Grade " <br /> =a � <br /> The native soils at the site are well suited to the support of �, _ <br /> m <br /> slabs on grade. A capillary break consisting of four (4 ) inches of � o ; <br /> washed sand or crushed rock having less than five (5 ) percent minus �� � <br /> O 3 <br /> 200 size material is recommended under the slab. �Z <br /> x -� <br /> m <br /> �o i <br /> If fill is required to meet grades or where tanks have been remov- n � <br /> - rs <br /> ed, it should consist of structural fill, as described below. ��, � <br /> � <br /> � <br /> o � <br /> �n n <br /> Structural Fill � �, <br /> x <br /> m «-� <br /> N <br /> O <br /> R11 fill should be placed on a firm subgrade free of water or wet o m <br /> C N <br /> soil. 'I'he fill should be placed in twelve ( 12) inch maximum lifts m �^ I <br /> z c� <br /> and compacted to at 1=ast 958 of the ASTM D-1557 maximum dry dens- � m <br /> ity. The fill should conform to the following qradation if it is ' <br /> A <br /> � <br /> to be placed under dry conditions. ' <br /> z <br /> � <br /> s <br /> Sieve Size Percent Passing ;,, <br /> z <br /> 0 <br /> � . <br /> 4 inch 100 n � <br /> m <br /> # 4 25-75 <br /> i1 200 10 maximum � <br /> ' J <br /> � <br /> � <br />