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Down Gradient Shadow/Alluvial Aquifer <br /> From past slurry wall experience (e.g., Herbst Pit), the operator has found that there were <br /> no changes in the water level down gradient of the pit or lowering of the groundwater <br /> level. It is anticipated that the Baseline Resource pit will behave <br /> similar to the Herbst Pit since both pits shares comparable groundwater regimes and <br /> settings. Two monitoring wells are situated to track the water level down gradient. <br /> Results from the wells will be submitted in the annual report. <br /> Up Gradient Bulge <br /> From past slurry wall projects, the operator has experienced up gradient bulges. To <br /> monitor the amount of water collected in front of the wall, monitoring wells are placed <br /> outside the slurry wall, on the up gradient side of the pit. Usually the mounding of water <br /> creates enough pressure that the ground water flows around the wall. However, if the <br /> mounding creates problems for an adjacent property owner(s), the operator will installed <br /> perforated pipes enabling the water to be carried around the wall. <br /> The area that a bulge may occur is on the Kirby property. Presently, the parcel is vacant <br /> and is vegetated with grasses. The up gradient wells will monitor this area and action (as <br /> stated above) will be taken if mounding problems occur. <br /> Results from the wells will be submitted in the annual report. <br /> 7.) It is the objective of the operator to mine to the boundary of the "proposed approved <br /> setbacks upon receipt of agreements." However, since no notarized agreements or <br /> engineering evaluations has been submitted, the limit of mining will be kept back 200 <br /> feet from all permanent structures. Please find enclosed revised mining plans reflecting <br /> the "proposed approved setbacks upon receipt of agreements" (solid line) and the 200' <br /> setback (thick dashed line). The operator is committed to marking the 200' setback in the <br /> Held to ensure no mining occurs outside this limit. <br /> Please find enclosed the receipt for certified mail and return for the response letter dated <br /> December 16, 1997. Also enclosed is a stamped transmittal from the Weld County Clerk <br /> tv the Board tvr the materials received regarding he response letter dated December 31, <br /> 1997. <br /> Sincerely, <br /> TUTTLE APPLEGATE, INC. <br /> Molly Orkild-Larson <br /> MOL <br /> Encs. <br /> cc: File#97-12513 <br /> Jeff Gregg, Hall Irwin Construction Co. <br /> C:/proj/97-125 b/moUDMGTE4.doc <br />