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<br />product will perform better than that material which would conform to the gradational <br />specification. The following Table outlines the original specification and the proposed <br />modification or addition. It would be preferable to retain both specifications as acceptable in <br />the event that the source rock is modified and the grain size shifts somewhat. <br />U.S. Standard Sieve Size ORIGINAL SPEC. <br />% Passing by <br />Dry Weight PROPOSED SPEC. <br />% Passing by <br />Dry Weight <br />3/4 Inch 100 100 <br />3/8 Inch 40 - 70 0 - 70 <br />No. 4 5 - 50 0 - 50 <br />No. 40 0 - 20 0 - 20 <br />No. 200 0 - 10 0 - 10 <br />Plasticity Index 0 0 <br />A data sheet that documents the grain size distribution of the proposed material is included as <br />Attachment 1. <br />Ames Construction is anticipated to be ready to place Underdrain Pipe Backfill by Saturday <br />July 16, 1994. Therefore your quick response to the issue is appreciated. Thank you for <br />your assistance. <br />E. <br />Environmental Affairs <br />Attachment(1): a/s <br />FILE: CC&VSTIP.002 <br />2 <br />