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Mountain Coal Company, L.L.C. Exhibit 51 <br />West Elk Mine Lower Refuse Pile <br />professional engineer summarizing all monitoring will be sent to CDMG as required by Rule 4.09.1 (1 I ). <br />• The summary of the density tests will also be included with this report. This information is included in the <br />quarterly site inspection reports submined to CDMG. <br />8.4 Compaction Testing <br />The refuse material will be compacted to 90% maximum dry density. ASTM method D-698-78 <br />(reapproved 1990). 1.1.4 Method D (Standard Proctor Density) or ASTM method D-I»7 (Modified <br />Proctor Density) will be used to determine moisture-density relationships of the refuse-soil aggregates. <br />Equivalent AASHTO standardsmay be used at the discretionof [he Ensineer. <br />Field density tests will be performed by one of [he following methods: <br />1. ASTM D-156, Sand Cone Method. <br />2. ASTM D-2167, Rubber Balloon Method, or <br />3. ASTMD-292'_.NuclearMethod. <br />The following densitytesting parameterswill be utilized. starting January 24, 1996. They are as follows: <br />• Moisture content-dry density relationship (Proctor) tests will be performed for each quarterly testing as <br />scheduled by MCC. The proctor sample will include particle size for percent of aggregate larger than <br />three (3) inches, percent aggregate from the three quarter (3/4) inch size to three (3) inch size, percent <br />aggregate number 4 size to three quarter (3/4) inch size, and percent aggregate smaller than number 4 <br />•, size. The proctor data presentation will include the moisture content and dry density of each test point <br />used to develop the moisture content-dry density relationshipcurve. <br />• Each nuclear density test site on the refuse pile will be excavated after completion of each test and the <br />material will be observed for an unusual amount of large rocks. The material will then be screened for <br />percentages of material sizes as determined for the proctor test and the field screen test results will be <br />reported on the density test results sheet. If the material appears to have an unusual amount of large <br />rocks at the test site an offset test will be performed with the same procedures as discussed above. <br />The minimum test frequency will be quarterly provided at least one lift (24 inches) has been placed during <br />the quarter. If a lift has not been placed, compaction testing will not be performed. This plan represents a <br />minimum frequency of testine. if necessary. MCC may increase the frequency of compaction testing. The <br />number of tests, locations, and methods will be determined by MCC at whatever level is appropriate at or <br />above the minimum test frequency. <br />Compaction testing will be done in accordance with good en~_ineeringpractice. <br />•~ <br />J~ <br />36 <br />