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<br />was found different than the specifications but suitable for use. On June 19, 1994, CC&V <br />requested confirmation of suitability from the OMLR. <br />Geochemical testing of a representative sample of the Gold Star material was completed and was <br />submitted at the same time. The sample was collected by Golder Associates on June 1, 1994. <br />The sample was analyzed by Core Laboratories for acid-base accounting and by the Meteoric <br />Water Mobility Procedure (Nevada Procedure). The response was thus also to a commitment <br />of CC&V that was made as part of the April MLRB approval. The letter also contained <br />information on the suitability of the granitic materials as underdrain rock. <br />Q(2) CC&V letter dated July 1, 1994 -Use granitic material for pipe bedding & pipe cover <br />(back£ill). <br />Letter Reference: Cresson Project: Permit Number M-80-244: Commitment Number " 33" <br />(Specifications) -Underdrain Pipe Backfill -Source. <br />In a previous letter (June 3 and June 19, 1994), CC&V reconfirmed its proposal to use the Gold <br />Star Pit material in the leak detection trenches (see !tl above). This July 1, 1994 letter addresses <br />the use of granitic material instead of Goldstar Pit material as pipe bedding and pipe cover in <br />the underdrain system (bedding around the 24-inch and 4-inch pipes). It requests substitution <br />of the granitic material obtained from the area of the valley leach facility as the bedding and <br />backfill for the underdrain pipes. <br />Q(3) Let[er dated July 6, 1994 -Maximum size 8 inch increased to 12 inch for Underdrain <br />Rock. <br />Letter Reference: Cresson Proiect: Permit Number M-80-244: Commitment Number "3.6" <br />(Underdrain Material) -information on Suitability of Granitic Material <br />For Use As Underdrain and Underdrain Pipe Bedding Material - <br />Commitment Number 32. Request to Modify Specification for Underdrain <br />(maximum size). <br />In order to confirm that the granodiorite located on "D-10 Hill" was suitable for use in the <br />underdrain (as "french drain rock"), point load test data, agreed to as a better determinant of <br />stability than the LA Abrasion test, were submitted via this letter. The letter also confirms field <br />observations made with th LR regarding the difficulty of limiting the maximum size to 8 <br />inches and proposes 12" ~ mstead. These are the materials and specifications used <br />thereafter upon approval by the Office. <br />Q(4) CC&V letter dated July 12, 1994 -Modify construction of underdrain in form of "stub-T <br />shape" in upper, narrower, reaches of Arequa Gulch. <br />Letter Reference: Cresson Project: Permit Number M-80-244: Valley Leach Underdrain <br />Configuration. <br />2 <br />