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Water Storage Pond Compacted Clay Liner <br />Parcel 1, S%a , SW%, Section 35, T1S, R67W <br />Adams County, Colorado <br />in such soils can be very difficult if water contents are not monitored closely. The <br />Contractor should be prepared to handle soils of this type, including the use of chemical <br />stabilization, if necessary. <br />Compaction areas should be kept separate, and no lift should be covered by another <br />until relative compaction and moisture content within the recommended ranges are <br />obtained. <br />Settlements Settlements will occur in filled ground, typically on the order of 1 to 2 <br />percent of the fill depth. For a 10-foot fill, this corresponds to settlement on the order of <br />1 inch. If fill placement is performed properly and is tightly controlled, in GROUND's <br />experience the majority of that settlement will take place during earthwork construction. <br />The remaining potential settlements likely will take several months or longer, to be <br />realized. <br />Erosion Protection The temporary and permanent graded slopes will be vulnerable to <br />erosion both from precipitation runoff and pond wave activity. Appropriate erosion <br />control measures should be included in project design. <br />QUALITY ASSURANCE <br />GROUND recommends that a geotechnical engineer be retained to provide quality <br />assurance materials testing for the clay liner system, including the overlying <br />embankment fill. Project earthwork also should be observed and monitored for general <br />compliance with the plans and specifications as they relate to construction materials. <br />The geotechnical engineer should provide a written declaration stating that the project <br />site, including the building pad area, was filled with acceptable materials and was placed <br />in general accordance with the requirements outlined In this report or otherwise specified <br />for the project. <br />GROUND recommends that testing and reporting for quality assurance during <br />placement of the liner system to be performed by a geotechnical engineer in accordance <br />with the following schedule: <br />• Maximum Dry Density / Optimum Moisture Content Tests 1 test per 5,000 yd3 & <br />(ASTM D698 & D1557, the "standard" and "modified" Proctor) 1 per distinct soil type <br />Job No. 09-3094 GROUND Engineering Consultants, Inc. Page 7