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ERA <br />ERO Resources Corp. <br />1842 Clarkson Street <br />Denver, CO 8021 B <br />(303) 830-1188 <br />Fax: 830-1199 <br />Denver Boise <br />www. eroresourres. rom <br />era@eroresourres.com <br />DRAFT <br />March 15, 2007 <br />Mr. Larry Thompson <br />Thompson Properties <br />P.O. Box 3 <br />Granby, CO 80446 <br />Re: Ground Water Observation Well Plan for Gravel Pit Expansion, Granby, CO <br />Dear Mr. Thompson: <br />This letter constitutes ERO Resource Corp.'s (ERO) ground water observation plan in <br />support of the proposed gravel pit expansion onto property owned by Thompson <br />Properties northwest of Granby, Colorado. This observation plan was prepazed in <br />response to a requirement put forward by the Colorado Division of Reclamation Mining <br />& Safety's Mined Land Reclamation Boazd in a hearing on January 14, 2007. The plan <br />calls for the installation of three ground water observation wells on the northern and <br />eastern boundaries of the gavel pit expansion property and the measurement of ground <br />water elevations in the wells for five consecutive quarters prior to commencing mining <br />activities. The purpose of the ground water measurements is to determine the ground <br />water flow direction at the property and to establish a baseline for site-wide ground water <br />elevations that can be referenced after mining activities have commenced. It is our <br />recommendation that the depth to ground water should continue to be measured quarterly <br />in the wells after mining activities have commenced. <br />Observation Well Installation <br />The three observation wells will be installed along the property boundary in the areas <br />of the three adjacent domestic wells. One well will be located in the southeast comer of <br />the property near the Spurlin well, one well will be located in the northeast corner of the <br />property neazest to the Hansen well and one well will be located in the north-central <br />portion of the property near the Mirabito well (Figure 1). The wells will be installed <br />using anair-rotary drill rig to the top of bedrock, which is anticipated to be between 65 <br />and 70 feet below ground surface (bgs) based on drilling logs from the above-mentioned <br />domestic wells. The wells will be completed with 10 feet of 2-inch diameter PVC well <br />screen and 55-60 feet of solid PVC casing to approximately 4 feet above the ground <br />surface. Silica sand will be installed in the well borings around the casing to a depth of 5 <br />feet above the well screen, bentonite will then be installed to a depth of 10 feet bgs and <br />concrete grout will be installed to the ground surface. The wells will be secured by a <br />lockable steel riser embedded in the concrete. Once the wells are installed, their locations <br />Eonso!lann rn <br />Natural Resourres <br />and the Environment <br />