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Water Storage Pond Compacted Clay Liner <br />Parcel 1, S'/2 , SW'/. , Section 35, TIS, R67W <br />Adams County, Colorado <br />Claystone fragments larger than 3 inches in maximum dimension should not be <br />incorporated into the liner fills. Adequate watering, and compaction equipment that aids <br />in breaking down the material (e.g., a Caterpilar 825 compactor-roller), likely will be <br />needed. <br />On the inner (excavated slope) side, the liner materials should be benched into the <br />excavation back out slopes with benches no more than 2 feet. in height. It may be <br />beneficial to over-build the outer clay liner slope and trim it back in order to achieve <br />adequate compaction in the materials near the outer slope face. <br />Miscellaneous Fill Cover GROUND recommends that the clay liner be overlain by a <br />section of `miscellaneous fill' consisting of available, on-site soils or similar, imported <br />materials. The miscellaneous fill should be no less than 2 feet in thickness (near the <br />tops of the slopes) and, as recommended in the Slope Stability Modeling section of this <br />report, should be constructed with a finished slope no steeper than 3:1 <br />Care should be taken by the contractor not to allow desiccation of the liner material <br />between the time of its placement and placement of the overlying miscellaneous fill. <br />PROJECT EARTHWORK <br />On-Site Soils Site soils free of organic debris and other deleterious materials are <br />suitable, in general, for placement as miscellaneous fill. <br />Cobbles and non-expansive rock fragments larger than 6 inches in maximum dimension <br />will require special handling and/or placement to be incorporated into the miscellaneous <br />fills. Standard recommendations that likely will be generally applicable can be found in <br />Section 203 of the CDOT Standard Specifications for Road and Bridge Construction <br />(2005). <br />Imported Fill Materials If it is necessary to import material to the site as miscellaneous <br />fill, the imported soils should be free of claystone, organic material, and other deleterious <br />materials. Imported material should have less than 50 percent passing the No. 200 <br />Sieve and should have a plasticity index between 5 and 30. All fill materials should be <br />tested and approved by a geotechnical engineer prior to import. A geotechnical <br />engineer should be retained to perform such services at least 1 week prior to import. <br />Job No. 09-3090 GRQUND Engineering Consultants, Inc. Page 5