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2~Page <br />Dolphin Property <br />Areas excavated beyond the outer limits of the storm water retention pond (Pond) footprint will be <br />backfilled by placing and compacting materials in approximate one to two-foot lifts. A <br />compactable material with high clay content will be used for the top one foot of backfill to create a <br />more solid surface with limited permeability. Amore granular material, with higher sand content <br />and permeability, will be used to backfill below a depth of one foot. Vegetated cover will be <br />established as needed at the end of the backfilling program. Organic rich soil and grass seed. will <br />be used to repair any mowed grassy areas located outside the excavation limits that may be <br />damaged by the use of heavy equipment. <br />The pond footprint will be restored to riear pre-existing conditions to provide storm water control <br />as originally intended. Pond base materials will be replaced using silty soils with sufficient. <br />organics, similar to the materials removed, tosupport re-establishment of cattails and_other water- <br />loving plant species. The materials will be placed and graded with moderate compactioh. The <br />three storm water inlets will be re-constructed to allow storm water runoff to enter as previously <br />established. <br />BNSF and AECOM look forward to discussing the IUP application at the May 6, 2010, planning <br />commission meeting. AECOM and BNSF appreciate your assistance with this project. Please call <br />meat (218) 625-8766 if you have questions regarding this permit application. <br />Sincerely, <br />AECOM, Ina <br />~~~ <br />Thomas Dahl, P.G. <br />Project Manager <br />Attachments , <br />cc: Mr. Mike Woolridge, BNSF <br />Mr. Glen Olander Quamme, Ricke & Sweeney, P.A. <br />21 <br />