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EEC Project No. 199-00?6 <br />May 6, 1999 <br />Paee 2 <br />Earth Ensinecrin_ Consultants. Inc. <br />materials excavated from the bottom of the pit. We recommend the overburden lining be <br />compacted to at least 98% of the material's maximum dry densit)• as determined in <br />accordance with ASTM Specification D-698, the standard Proctor procedure. The <br />moisture content of the overburden materials should be adjusted to be within the range of <br />±2% of standard Proctor optimum moishlrc at the time of compaction. <br />Permeability tests were previously completed by others on compacted samples of the <br />overburden soils. Results of those permeability tests are attached. State of Colorado <br />interim re,ulations require that seepage rate of groundwater into the empondment be <br />limited to 0.03 cubic feet per day per square foot of wall when the empondment is empty. <br />[3ased on results of the Vaboratory permeability tests and proposed configuration of the <br />pond lining, we believe the inflow rate of the empondment will be significantly less than <br />allo~~c~l b) the state requirements. <br />\Vc appreciate the opportunity [o be of sen~ice to )'ou on this project. If you have any <br />yucslions concernin~~ this report, or if «e can be of Ihrthcr service to you in any other <br />~coc. please do not hesitate to contact us. <br />Vcn tnih• yours. <br />Garth Engineering Consultants, Inc. <br />Principal Engineer <br />I.LI. dm( <br />I.c>ter I_. Litton. P.l:. <br />