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/. <br /> �v:mt'-4 <br /> U� MEMORANDUM 9400Station Street <br /> ~~ Suite 3O0 <br /> To: John ShifOet1—CC&V Lone Tree, CU80l24 <br /> From: Eric Nieb|er—Nex»Fie|ds T: 720.5O833OO <br /> � <br /> 720 <br /> Project: High Grade Mill (HGK4) Platform Extension F� .5O8.3339 <br /> N� Project No: 475.0106.019 <br /> Subject: Select Structural Fill Compaction Method Specification <br /> Date: AugustO4, 3017 <br /> ......... <br /> ���... <br /> ....... <br /> �����������������__������������ ������ ��������������_........ <br /> ....... <br /> Schnnueser Associates (Schrnueser) used Select Structural Fill (SSF) to perform site grading <br /> during the construction of the High Grade K4i|| /HGK4\ platform extension. All fills constructed <br /> ` ' <br /> ~~ with SSF were placed using method specification that was developed during construction. The <br /> CQA Monitor observed and approved a method specification for the HGK4 platform extension <br /> project. The use of this method compaction technique was necessary as the fill materials used <br /> contained more than ]O percent rock above the %-inch sieve, classifying it as a rock fill. Based <br /> on site experience and anticipated fill materials, a method specification was developed for a 10- <br /> N� tmnvibratorysmmo1hdrumcmmpactmr. <br /> The method specification was developed by first preparing an area to receive material that was <br /> firm, unyielding, and representative of actual fill placement conditions. The desired lift <br /> thickness /12 inches) was then placed and moisture conditioned. A grid was surveyed and <br /> marked across each test pad by the surveyor allowing the same points to be checked <br /> repeatedly. One pass was made and the points were checked for any change in elevation. This <br /> was repeated until less than W elevation change was noted after at least four consecutive <br /> passes. Two lifts were tested for each method specification and this process was performed for <br /> each lift. It was found that in conjunction with the specified lift size, four passes of the 10-tmn <br /> vibratory smooth drum roller would be sufficient for compaction in the method specification. <br /> A test pit was then excavated in the center of the test pad and observed by the [CA monitor. <br /> Difficulty of excavation, fill uniformity, and fill material durability were inspected and found to <br /> be acceptable. Photographs of the method specification development are attached to this <br /> memo. The [C\A Monitor accepted the method specification and all fills constructed with SSF <br /> were performed in accordance with both the method specification and project technical <br /> specifications. <br /> Page <br /> �� <br />