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.. 3. <br />r _~c <br />The excavated area can be refilled with large diameter rip-rap covered with <br />coarse gravel (2-inch crushed rock). The rip-rap and gravel should extend <br />above the elevation of the seepage at least 3 feet and be provided with an <br />outlet to the pond. <br />4. Fill above the rip-rap can consist of native sand or clay soils, crushed rock, <br />or bedrock which has been broken down to soil sized material. Materials <br />from the existing slide mass should be suitable for re-use provided they <br />are comparatively dry. We do not recommend incorporating significant <br />quantities of claystone or claystone derived soils into the fill. The fill <br />should be placed in thin lifts of 8 to 12 inches and compacted with several <br />passes of heavy equipment. Final grading should provide good drainage <br />of surface water out of the area and into the pond. The slope above the <br />slide should be flattened as much as practical and re-vegetated. <br />Stockpiling of topsoil, or other surcharges should not be placed in this <br />area in the future. <br />Our observations and recommendations were prepared using methods and <br />procedures consistent with other professionals practicing geotechnical engineering in this <br />area at this time. No other warranty, express or implied, is made. We hope this provides <br />the information you require. If you have questions, please call. <br />Very truly yours, <br />CTL(T'HOMPSON, IN REGiST <br />~~~ ' ~ ~ Gq~~9~0 <br />Gray, F <br />Manage <br />Reviewed by: <br />`~ -C <br />Ronald M. McOmber, P.E. <br />Principal <br />MGG:RMM:mgg/sdc <br />(5 copies sent) <br />4 <br />