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January 19,2016 <br /> HWA Project No. 2014-162-21 <br /> 3. Erosion control,temporary and permanent. During out site inspection visits,our <br /> inspector verified that temporary erosion control measures were properly functioning and <br /> that sediment was not leaving the project site. <br /> 4. Rockery subgrade.HWA observed and inspected all wall subgrades prior to placement of <br /> rocks. Where subgrade conditions varied from the design assumptions,HWA completed <br /> additional analysis and made recommendations for specific changes to facilitate a more <br /> stable wall design. Based on our observation of construction,the rockery subgrade was <br /> properly prepared and the bottom layer of rocks were placed in conformance with our <br /> recommendations. <br /> 5. Rockery Batter and Height. HWA provided full time inspection of the construction of the <br /> rockery. Throughout construction HWA monitored the rockeries batter. Our observations <br /> indicated that the rockery was constructed at a batter consistent with our geotechnical design <br /> report and project plans. Our rockery design recommendations also assumed that the <br /> maximum rockery height would be 9 feet. However,during construction,for a distance of <br /> approximately 2 feet the apex of the wall extended to a maximum height of 9.4 feet. The <br /> measured height of the completed rockery is provided in Figure 1 of this report. HWA has <br /> conducted additional analysis and has verified that the additional 0.4 feet of wall height will <br /> not negatively affect the stability of the wall. In general,the rockery was constructed to a <br /> batter and maximum wall height consistent with our recommendations and analysis. <br /> O.O <br /> 2 <br /> Summary Letter HWA GcoSciences Inc. <br />