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r <br /> <br /> <br />.. <br /> <br />• <br />• <br />LABORATORY INVESTIGATION <br />Four bag samples were collected for gradation analyses and a Los <br />Mgeles abrasion test. Mechanical analysis charts are shown in Figures <br />10 and 11. Course gravel (retained on 3/4 inch sieve) was found In all <br />five test holes and ranged Prom 1.8 weight percent In test hole 5 to <br />13.0 weight percent in test hole 3, with an average 7.3 percent for all <br />four samples. Total gravel (retained on No. 4 sieve) ranged from 31.1 <br />percent in test hole 2 to 48.9 percent In test hole 3, with an average <br />of 37.6 percent Por all four samples. The bulk of the aggregate in all <br />but one test hole was sand. Total sand (passing No. 4 sieve but retained <br />by No. 200) varied from 44.1 percent in test hole 3 to 67.2 percent In <br />test hole 2, with an average oP 56.4 percent. Fines (passing No. 200 <br />sieve) ranged from 1.7 percent to 9.8 percent. One Los Angeles Abra- <br />sion Test (ASTM, C-535, 131) was performed on a sample from test hole <br />4. This test was performed by Western Testing Laboratories, Inc. The <br />results of the test using 500 revoluttons - Grading A, was 33.0 per- <br />cent wear. This is well within the maximum of 45 percent wear deslg. <br />noted by AASHTO T96. <br />VOLUME ESTIMATION <br />Volume of the overburden and aggregate was based an the average <br />thickness obtained from the drilling investigation, multiplied by the <br />area, obtained from a topographic map. The area used for volume calcu- <br />lotions was 1.77 million square feet. This area was multiplied by the <br />average aggregate thickness of 41.5 feet which results in a volume of <br />approximately 2.7 million cubic yards. Based on a value oP 1.64 tons <br />per Cubic yard, this amounts to approximately 4.5 million tons oP aggre- <br />gate on the site. The value of 1.64 tons per cubic yard was derived <br />-4- <br />L <br /> <br />• <br />• <br />• <br />