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Ms. Deb Gbnima <br />June 12, 2006 <br />Page 5 of 12 ii <br />13.The existing asphalt ro d at the south edge of the ponds will be demolished and <br />stockpiled by the slurry wall contractor, and legally disposed of. <br />14.The "Lake Improvement Grading Plans" have been revised such that the <br />swimming area grade is 5h:1 v or flatter. These plans are enclosed with this <br />letter. <br />15.The existing permitted area for the Siegrist Construction Company permit M- <br />1982-015 is 169.6 acres. The amended application increases the area to <br />208.5 acres, as show i on the attached map entitled, "Lake Reclamation <br />Exhibit" Tab 14. This exhibit also indicates the location and sizes of the <br />temporary sediment ponds. Their exact configurations are shown on the <br />enclosed "Lake Improvement Grading Plans". <br />Also included is a revised Construction Materia/s Regu/ar (112J Operation <br />Rec/amation Permit App/ication, Page 1, which reflects the acreages of the <br />existing and proposed (permits. Tab 9 <br />16.The map provided in Terracon's reports was prepared in a very preliminary <br />stage of planning for the development. Their map has been revised and is <br />attached to this response letter. Tab 10 <br />17. Reference June 5, 2006 memorandum from Applegate Group, Inc. Tab 6 <br />18. Reference June 5, 2006 memorandum from Applegate Group, Inc. Tab 6 <br />19.The average depth (height) of the slurry wall is estimated to be on the order of <br />about 24 feet. This is based on the final grading plans with an average top of <br />wall elevation (including capl of about 4824 to 4825 and an average key <br />elevation of about 4807. The wall height varies along alignment depending on <br />the depth of anticipated keylbedrock depth) and approaches maximum depths <br />of up to about 35 feet. It should be noted that the borings performed along the <br />alignment were not always drilled at the proposed final grade but at existing <br />grade. <br />20.Excessively coarse materials will be supplemented with clayey borrow from the <br />Siegriest property as needed to maintain the required amount of fines for the <br />soil bentonite backfill (mixture based on the mix design determined prior to <br />construction. The effects of the high water table will not impact the <br />construction of the slurry wall due to the slurry trenching method. (The <br />G:\3811\3811-DMG Permit\DMG Atlequacy Rvw Response\3811 Response Letter DMG.tloc <br />