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SENECA COAL COMPANY -POND 14 CONSTRUCTION <br />Work: Structural FilUSoils Nuclear Density Test Result Summary <br />Project Location: Hayden, Colorado <br />Project Number: 2470108 <br />Field Technician: Matthew G. Mathisen <br />Summary Work Performed By Monteomerv Watson Harza COA Field Technician <br />Dam Construction: <br />Between July 30'" through September 18, 2001 MWH CQA Field Technician made 10 trips to Seneca <br />Coal's Pond 14 Construction Site to perform Nuclear Density Testing on the structural fill being placed [o <br />build [he Pond 14 dam. Troxler testing took place at random times and locations throughout [he entire <br />constmction phase. A total of 34 tests were taken during dam construction <br />Results: (22 Passed) -All design requirements <br />(12 Failed) -These failures were do [o low compaction reading from Troxler test, and re-tested <br />after further compaction of soil was done by Seneca Coal company equipment operators. No additional <br />soil lifts were put in place until last lift had passing scores. <br />Riser pipe installation: <br />Installation started on September 13, 2001 and was completed on September 17, 2001. Throughout <br />installation a total of 9 Troxler tests were taken. <br />Results: (9 Passed) -All design requvemen[s <br />• <br />' /'~ arNiS£~ <br /> <br />