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KLE1NFELDER <br /> File No. 20-1008-38 <br /> s-° August 1, 1990 <br /> r- <br /> f <br /> greater than 35 degrees. Our assumed strength <br /> values correlate well with those of other <br /> r landfill closure caps in San Joaquin County. <br /> REpUsE MATERIAL: <br /> �Y We understand that the refuse will be composed <br /> of a mixture of soil and waste. Refuse from <br /> other landfills in the San Joaquin Valley has <br /> had surprisingly high cohesion, up to 3 ,000 <br /> psf. The friction values have typically been <br /> ` lower, between 20 and 25 degrees. We <br /> anticipate the refuse to be somewhat loosely <br /> ` - compacted; therefore, we have conservatively <br /> assumed 500 pounds per square foot cohesion, <br /> 20 degrees friction. Officials at San Joaquin <br /> County have informed us that an approximate <br /> unit weight of 50 pounds per cubic foot is <br /> anticipated. <br /> I ' <br /> NATIVE MERLYING SOIL CONDITION: <br /> In general, the native soil consisted of silty <br /> fine sands mixed with occasional layers of <br /> r- sandy silty clay and sandy clayey silt. The <br /> i.:...: sands graded from fine to coarse. All sample <br /> blow counts met refusal in our preliminary <br /> investigation. Due to the density of the <br /> material, inter-particle bonding would be <br /> expected to have minor cohesion. We would <br /> anticipate the cohesion to be somewhere between <br /> { 200 to 500 pounds per square foot. A dense <br /> ® 3 <br />