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Beth Mitehell.,and.rpon Donaldson March Page 5 any potential adverse impacts which is contradictory to the recommendation contained in the physical modelling report. Based on recent conversations with County staff, there appears to be a desire to place sand fill due to the lack of accumulated sediment projected by the numerical model to occur as a result of the proposed installation. Please be advised that any fill placed in conjunction with the PEP reef will involve a modification to the current proposal. This would also apply to any proposal to place sand fill once the experimental test plan is underway. Placement of fill during the test would seriously jeopardize the experiment and could result in revocation of the permit, if issued. If the County wants"to expand the ongoing dune restoration program in lieu of constructing the PEP reef as an interim measure, or on an annual basis through a truck haul project to provide storm protection and a wider and higher beach profile above the mean high waterline which would also improve marine turtle nesting habitat, the Department will assist the County in expediting the permitting process for such a proposal and may also possibly participate in the funding of such a project. 13.6 As mentioned previously, the reduced drawings required pursuant to Chapter 62B -41.008(1)(i), F.A.C., have not been signed and sealed. 16. I would like to comment on the existence of underlying rock at the proposed structure's location: The Du Pont installation site in Palm Beach County has similar underlying rock where the units were placed. Observation over approximately 5 years indicates the units settled to the rock bottom. This was caused by reflection of wave energy and scour. Because of this reflection of wave energy and scour, the thin veneer of material at the structure location is removed and transported out of the zone of influence of the structures. This same wave energy reflection and scour is what has also contributed to the settlement problem of the originally installed unite and the remaining units at the Midtown installation causing then to sink an average of 2.71 and 1.87 feet respectively, according to the seventeen month monitoring report. It can be expected that this wave energy reflection and scour phenomena will also occur'at the Vero.Beach installation resulting in significant quantities cf material being transported outside the zone of influence of the proposed structure. 17. This item remains incomplete. 27 MARCH 28, 1995 I will begin with Exhibit 1, BOOK 94 m,:L