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Windsor East Mine, Exhibit D – Mining Plan September 2022 <br /> Page 3 | 4 <br /> <br />5.0 OFFSETS <br />Tetra Tech prepared a Slope Stability Analysis to ensure that all existing structures will be protected based on the <br />proposed reclamation slopes. <br />6.0 ROADS AND CONVEYORS <br />Preparation for mining for each phase will include a 15’ wide gravel access road around the perimeter of the cell. <br />Any additional short-term haul access will be constructed with 6” of native sand and gravel from the floor of the <br />mine. These gravel roads will be removed and reclaimed as mining and reclamation is completed for each phase. <br />These areas have been included in the permitted acreage. <br />All the material will be transported via conveyor from the mining cells to Martin Marietta’s Parsons Mine to the <br />east for processing. The conveyor is set on concrete block or frames. The main line will run down the future <br />Crossroads path and feeders will be dropped in to each phase we are mining and then removed before <br />reclamation. All areas affected by the conveyors will be re-topsoiled and seeded to restore ground to the original <br />condition. <br />A 10.5’ wide existing road that currently connects to WCR 23 will be utilized to provide street access to this site. <br />The location of this existing road is shown on Exhibit C, Pre-Mining Plan. It is located northwest of cell B. <br />7.0 MINE SCHEDULE <br />Depending on market conditions, the Windsor East Mine operation will process approximately 450,000 – 500,000 <br />tons of aggregate per year. At this rate, Martin Marietta anticipates mining and reclaiming the site in <br />approximately 8 years (about 6 years to mine and another 2 years to complete reclamation and get grasses to <br />establish). The table outlines the anticipated mine schedule by phase. As previously stated, this schedule is just <br />an estimate since the rate of mining and overall life of the mine is dependent upon demand and market <br />conditions. <br /> <br />Phase Mine Area (in acres) Projected Time to Mine (in years) <br />Cell A 35.3 2± <br />Cell B 17.7 1± <br />Cell C 32.3 2± <br />Cell D 4.8 1± <br /> <br />8.0 PHASE OVERVIEW <br />The four cells in Windsor East will be mined as explained below. The following is a detailed description of Martin <br />Marietta’s plan to mine the four cells that are proposed along with an explanation of how the topsoil and <br />overburden will be handled. Please refer to Exhibit C-3 for the locations of each mining cell, topsoil stockpile <br />(TS#) and overburden stockpile (OB#). <br />1. The topsoil from Cell A will be stripped and placed on the north property line in stockpile TS1. Overburden <br />from Cell A will be stockpiled in OB1. <br />2. Cell A will then be mined. <br />3. Topsoil from Cells B and C will be stripped and placed in stockpiles TS1, TS2, and TS3. Overburden from <br />Cell B will remain in place and overburden from Cell C will be used to reclaim the slopes of Cell A. Any