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Creek Diatreme. The design follows a very sound concept. I would <br />suggest a change in the design of the cover system to provide further <br />reliability against potential erosion and cracking. It is suggested that the <br />compacted clay layer be covered by 1.5 to 2 feet of clayey materials to <br />better protect this layer. <br />Thank you for the opportunity to complete this review. Please contact me if there <br />are any questions or if I can provide further clarification. <br />Sincerely, <br />&A <br />Wsk <br />Dirk van Zyl, P.E., Ph.D. <br />Consultant <br />9