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1.0 Introduction <br />This report summarizes geotechnical observations gathered on January 21 and 22, 2014 at the <br />Morrison Quarry, operated by Aggregate Industries (AI). This report supplements the "2013 <br />Notice of Intent to Continue Mining Operations / Annual Report" for the Morrison Quarry. <br />Rock characteristics such as joint and foliation orientation, shear zones, faults, and instability <br />zones were mapped for areas mined in 2013. Recommendations for mine highwall <br />configuration provided are based on GEI Consultants, Inc. (GEI) observations and data <br />analysis. This addendum provides information required by Permit Amendment #5 (carried <br />over from Permit Amendment #3 and #4) to Mining Permit M -1973 -021. <br />1.1 Observational Method <br />The Observational Method for the Morrison Quarry is described in detail in Mine Plan <br />Amendments Numbers 3 and 4. This is step -wise approach to slope design uses new <br />observational data to regularly update quarry highwall configuration. This methodology is <br />used as a practical approach to mine highwall design for rock mass with variable condition <br />that is difficult to classify. Newly obtained data will be compared to baseline data obtained <br />during previous geotechnical addendums for analysis. This method has been used for slopes <br />in the North, Central, and South Quarries of the Morrison Quarry. <br />The annual geotechnical addendums allow for Colorado Division of Reclamation, Mining, <br />and Safety (DRMS) review of existing and evolving quarry conditions. <br />1.2 Site Description <br />The Morrison Quarry is located west of Colorado Highway 8 and approximately 'h mile <br />north of U.S. Highway 285 in Morrison, Colorado. The site location is shown in Figure 1. <br />The mine site is located west of the Dakota hogback along the Front Range west of Denver, <br />Colorado. <br />The Morrison Quarry consists of three cells, the North Quarry, the Central Quarry, and the <br />South Quarry. Active mining no longer occurs within the North or Central Quarries. The <br />North Quarry currently holds water utilized as mine process water. Within the North Quarry <br />footprint, the North Repository acts as repository area for undesirable material such as waste <br />aggregate from mine operations or damaged or inoperable mine equipment. The North <br />Quarry was mined to an approximate bottom elevation of 6220 feet above mean sea level <br />(MSL) utilizing highwalls and benches at a nominal 1:1 (H:V) slope. Minor mining activity <br />related to local site improvements occurred in the North Quarry in 2013. In the Mine Safety <br />Zone east of the North Quarry, a local ridge was removed to improve site access and <br />aesthetics. The material obtained from the local improvements was processed through the site <br />facilities. Equipment was placed within the North Repository during 2013. <br />GEI Consultants, Inc 1 January 2014 <br />2013 Momson Quarry Annual Report <br />