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<br /> <br />EEC Project No. 1082030 <br />ASCI - Turnpike Reservoir <br />May 5, 2008 <br />Page 11 <br />Earth Engineering Consultants, Inc. <br />Swell - Consolidation Test Results <br />The swell-consolidation test is commonly performed to evaluate the swell or collapse potential <br />of soils or bedrock for determining foundation design criteria. In this test, relatively <br />undisturbed samples obtained directly from the California sampler or thin-walled tubes are <br />placed in a laboratory apparatus and inundated with water under a predetermined load. The <br />swell-index is the resulting amount of swell or collapse as a percent of the sample's thickness <br />after the inundation period. Samples obtained at various intervals are typically pre-loaded at <br />500 psf to 1000 psf to simulate the overburden soil pressure at the tested/evaluated interval. <br />All samples are inundated with water and monitored for swell and consolidation. After the <br />inundation period additional incremental loads are applied to evaluate the swell pressure and <br />rate of consolidation. <br />For this assessment, we conducted five (5) swell-consolidation tests at various <br />intervals/depths. The swell index values for the samples analyzed revealed low swell <br />characteristics on the order of (+) 0.1 to (+) 1.9%. The (+) test results indicate the soil or <br />bedrock materials swell potential characteristics. <br />Earthen Liner Recommendations <br />We understand the performance of the raw water storage pond is to conform to the "Colorado <br />State Engineer Guidelines for Lining Criteria for Gravel Pits" dated August 1999. The <br />general guidelines state the following: <br />1.0 Design Standard: The intent of the reservoir lining design is to achieve <br />groundwater inflow (leakage rate) into the reservoir that is not greater than 0.03 <br />ft3/day/ft2 (1 X, 0-5 cm3/cm2/sec) multiplied by the length of the perimeter wall in <br />feet, multiplied by the average vertical depth of the perimeter wall as measured <br />from the ground surface to the pit bottom along the toe of the pit side slope, <br />plus 0.0015 ft3/day/ft2 (5x10-' cm3/cm2/sec) multiplied by the area of the <br />bottom of the liner system or natural bedrock bounded by the perimeter wall.