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PERMIT#:M-2004-078 <br /> INSPECTOR'S INITIALS: ECS <br /> INSPECTION DATE:November 16,2021 <br /> OBSERVATIONS <br /> This was a routine monitoring inspection for the Lupton Lakes site, a 112c sand and gravel operation permitted <br /> by Denver Water and operated by Martin Marietta Materials (MMM). The inspection was conducted by Eric <br /> Scott of DRMS. DRMS met onsite with Bard Piede and Dan Babyak of Denver Water, and accompanied them <br /> on a tour of the site. The site identification sign was present at the site entrance (Photo 1) and various locations <br /> around the site perimeter, however the site name was incorrect,and the permit boundary was defined in almost <br /> all areas by site fencing. <br /> Mining activity appeared to be in compliance with the approved plan at the time of the inspection, and the site <br /> appears to be well run and maintained. All mining activity was taking place in the southern cell of the site <br /> during this inspection(Photos 2-4). Mining in the northern cell has been completed and reclamation in that area <br /> is almost done with all sloping completed and revegetation well underway. The conveyor structure over Hwy <br /> 85 as approved in TR8 is in place and operational, and Denver Water is currently installing infrastructure in the <br /> north cell as approved in TR9. Denver Water stated that the gas well and supporting lines in the south cell had <br /> been plugged and abandoned and that feature would now be mined through as soon as the TR for the <br /> modification is submitted to and approved by DRMS. <br /> The issues requiring correction noted during this inspection were: <br /> • The omission of permit boundary markers from a small area of the permit—property not owned by <br /> Denver Water and the location of a gas and oil well; <br /> • Incorrect site name on several of the mine site identification signs. <br /> DRMS will require that the area outside of the site fence, but still within the current permit area, (occupied by <br /> the gas well and facilities) either be properly marked, or released from the permit area as"unaffected area". <br /> The site name should also be corrected on the site identification signs to avoid confusion with the nearby, but <br /> separate, Martin Marietta Riverbend operation site. <br /> Inspection Contact Address <br /> Brad Piede <br /> City&County of Denver,Board of Water Commissioners <br /> 1600 W. 12th Ave. <br /> Denver,CO 80204 <br /> Page 2 of 3 <br />