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Third Perty Oversight 71 Water, Waste & Lend, Inc. <br />Sen Luis Mine June 9, 1994 <br />4.0 RAISE 1 EMBANKMENT <br />This section discusses the material (Type 1) utilized for construction of the Phase II, <br />Raise I Embankment. The main issue discussed is material gradations and specifications, and <br />how any changes may have affected the original design intent. Also discussed ere initial and <br />final construction observations, and technical issues related to specification changes. <br />4.1 MATERIALS SPECIFICATIONS <br />' The design intent for the Raise I Embankment is discussed in Section 2.2. The original <br />material specifications, contained in the design report ISRK, 1993a), were formally revised <br />in the Construction Status Report ISRK, 1993c1 by BMRI after the October 1, 1993 DMG <br />' inspection. According to WWL's review of the Construction Status Report and personal <br />communications with field QA personnel, revisions to the original specifications were required <br />as gradations of available construction materials did not fall within the original (Phase 11, Raise <br />' I Embankment) specifications. The original and revised materials specifications for the <br />embankment material (Type 11 are shown in Tables 4.1 and 4.2. A visual comparison of the <br />original and revised gradation specifications is shown on Figure 2. <br />t <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br />1 <br /> <br />TABLE 4.1 <br />TYPE 1 MATERIAL SPECIFICATION SUMMARY <br />Specification Item Original Design <br />Specifications Revised <br />Spec ications <br />Maximum particle size (inches) in direct comact with <br />the VLDPE liner 1'h 1'~ <br />Maximum particle size (inches) elsewhere 3 6 <br />Compaction density (% of maximum dry density) None ~5 <br />Lift Thickness (loose) Iftl None 3 <br />TABLE 4.2 <br />TYPE 1 GRADATION SPECIFICATIONS <br />U.S. Standard Sieve Size Original Design Specifications <br />(% Finer by Weight) Revised Specifications <br />(% Finer by Weight) <br />3'e inch > 65 > 65 <br />ar4 45 - 95 45 - 95 <br />#10 25 - 65 none <br />x40 5 - 30 35 - 90 <br />+X200 <10 <35 <br />L1 <br />