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PMY <br /> ,,. .. •o. ,. .. -• . .`i� <br /> July 19, 2018 <br /> Stan Opperman <br /> APC Construction Co., LLC <br /> 14820 W. 44`h Avenue <br /> Golden, CO 80403 <br /> Subject: Ralston Quarry, Landslide Drone Survey <br /> Dear Mr. Opperman, <br /> Pinyon Environmental,Inc.(Pinyon),was contracted to conduct a drone survey of the Ralston Quarry Landslide <br /> located in Golden,Colorado. A landslide occurred on June 10, 2018 on the western side of the quarry. Pinyon <br /> Environmental visited the site on July 12, 2018 to fly the landslide area. The goal of the flight mission was to <br /> determine the area of the landslide, and area of land disturbance. The landslide was flown with a DJI Phantom <br /> 4 Pro Drone with a I inch 20-megapixel sensor. <br /> The data collected was processed using the application Drone Deploy, the process data was then <br /> imported in AutoCAD Civil 3D where areas were calculated and a figure created. Using this method, the <br /> landslide was determined to be 2.8 acres and total disturbed area to be 11.9 acres. Note that some of the <br /> disturbed areas were previously disturbed access roads. The attached figure shows the extent of the landslide <br /> and total disturbed area. <br /> Christopher Rolison I Environmental Engineer <br /> Pinyon Environmental, Inc. <br /> P 303.980.5200 1 M 423.284 7181 <br />