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<br />Ms. Erica Crosby <br />September 7, 1999 <br />Page ~ <br />The maximum pore pressure anticipated in the embankment would be approximately 7 <br />psi. <br />The design stability safety factor of the clay liner shall meet the standazds of the State <br />Engineers office for dam construction which aze; 1.5 for steady state operating conditions, <br />and 1.2 for rapid drawdown. <br />The two wells on Exhibit G-2 that aze within 1,000 feet of the mining operations (#6 and <br />#7) are owned by Jake Kauffman & Sons, Inc. Attached are the approved forms from the <br />SEO for the change in name/ownership of the wells. These wells were previously used <br />for irrigation and will probably be used for irrigation during reclamation of this operation. <br />All residences in the area are on Little Thompson Water District and do not use wells for <br />domestic use. <br />The mine plan map indicated a minimum 100 foot setback from the north top of bank at <br />the Big Thompson River in a note on the drawing below the label for the river name. <br />This setback is the general permit boundary on the Wagner portion of the site. There is a <br />fenceline running west to east, roughly parallel to the south permit boundary. This <br />fenceline is generally the south limit for the interior 30 foot setback of the limit of <br />mining. This fence will remain in place during mining. The mining setback will be <br />marked using wooden stakes. <br />6. Rule 6.4.9 The limestone material at the site that will be used for backfilling was a waste <br />product from the sugar beet processing when the land was owned by [he Great Western <br />Sugar Company. The areas that contain the limestone material (Phase II and III) were <br />settling basins, as the limestone waste product was piped to the area in a slurry mix with <br />soils washed from the beets during the cleaning and processing of the product. As these <br />areas were settling basins the distribution of the limestone material is fairly even within <br />the confines of the settling basins. It is approximately 6 to 8 feet thick. Attachment E-3 <br />of the original application materials is a copy of a material analysis done on the limestone <br />waste product. Attached to this letter is a copy of the paste pH analysis run on the <br />material at the request of Dr. Posey of the Division. There have not been any other <br />analysis run on the limestone materials. <br />Rule 6.4.13 The operator is required to obtain a Substitute Water Supply Plan as well as <br />a Gravel Pit Well Permit which is issued afrer the SWSP is approved. As stated above <br />the applicant has submitted a request to the Office of the State Engineer for approval of a <br />new SWSP for this operation. <br />