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<br />Letter to Luke Russell 2 March 28, 1994 <br />non-altered talus is selected, and should further assure that the <br />talus selected is durable. In order to verify rock durability, <br />Homestake should conduct and document standard field durability <br />testing, e.g., hand lens examination, hardness evaluation, and <br />field hammer testing. In addition, the Division recommends that <br />representative samples be subjected to the Los Angeles Abrasion <br />Test and Point Load Testing. Since the riprap source is to be <br />talus that has been exposed many cycles of freezing and thawing, no <br />Freeze-Thaw, Slake Durability, or Sulfate Soundness testing is <br />indicated. If any fresh (e.g., recently quarried) rock is to be <br />utilized, such testing may be necessary. <br />If you have any questions, please contact me. <br />Sincerely, <br />Allen C. Sorenson <br />Reclamation Specialist <br />C:\WP51\BULLDOG.FIN <br />