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<br />In either case, there will be a 0.5 foot thick structural fill on top of the underdrain rock. <br />Thus the contact configuration with the overlying geotextile and VLDPE liner will not <br />change. <br />The proposed configuration will facilitate construction because it will be easier and more <br />efficient to place bedding material in the lower trench in these narrower sections in a manner <br />that will cover the pipes than it would be to try to mound the bedding material on either side <br />of the pipes and sufficiently high to allow covering of the pipes in the upstream section of the <br />underdrain trench excavated to also contain the larger rock. It will be much easier for <br />equipment to operate in these narrower sections with this configuration. The same <br />constraints leading to the herein proposed modification do not impact the wider cross- <br />sectional areas to the same degree. <br />The flow capacities of the changed configuration have been re-computed by Golder <br />Associates and the information would, if I had the document with the re-computation, be <br />submitted as Attachment 2. However, as Dave Kidd explained, the calculations are still in <br />Golder's offices in Lakewood. Therefore Dave Kidd is to send a copy by facsimile <br />tomorrow morning (Wednesday). The re-computation that adjusts to the change in the <br />upstream segment of the underdrain demonstrates the same flow capacity exists as in the <br />original design. Therefore the capacity of the underdrain to pass quantities of water would <br />not change and, especially important, would not decrease. <br />If any questions arise, please do not hesitate to call. We would appreciate your concurrence <br />with our proposal at your earliest convenience because we should install underdrain pipe in <br />the next few days. If it is possible to verbally concur tomorrow upon receipt of the <br />calculations from Golder, it would allow us to maintain the construction schedule in that <br />regard. Thank you for your assistance. <br />Hardaway <br />Environmental Affairs <br />Attachments: 1. Cross section of underdrain configuration in area of equal to or less than <br />20-feet cross section. <br />2. Re-Computation of flow capacity of changed cross section (to be submitted <br />via facsimile message by Golder Associates on July 13, 1994). <br />FILE: CC&VSTIP.002 <br />2 <br />