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Applegate <br />Group, <br />Water Resource Advisors for the West <br />Memorandum <br />Date: May 11, 2015 <br />To: David Bieber, PG <br />From: Craig Ullmann, PE <br />Subject: Parkdale Slope Stability <br />AG Job No.: 14-138 <br />This memo summarizes the results of our slope stability analysis. As requested we have modified previous slope <br />stability models to incorporate the proposed impermeable surface liner as well as the proposed groundwater <br />drain. Soil Strength parameters were determined from tests performed by North American Testing, Inc. The <br />section geometry was based off a figure provided by you. Furthermore, the analysis was performed using the <br />following assumptions: <br />1. The groundwater drain indicated on the provided drawing will be able to reduce the surrounding <br />groundwater to at least the levels shown on the slope stability results. We have not reviewed the design <br />of this drain but are available to do so upon request. <br />2. The impermeable liner is fully intact. <br />3. Soil Parameters for the undisturbed alluvium and bedrock were based on our previous analysis <br />4. The failure was assumed to not go through the bedrock. <br />The model was originally performed at a slope of 2:1 and subsequent models were performed at slopes of <br />1.75:1 and 1.5:1. <br />Please let us know if you have any further questions or require any additional services. <br />7405 W. Highway 50, Suite 123 1490 W. 120 Avenue, Suite 100 118 W. 6th Street, Suite 100 <br />Salida, CO 81201 Denver, CO 80234 Glenwood Springs, CO 81601 <br />303-452-6611 <br />www.applegategroup.com <br />