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PERMIT#:M-1974-086 <br /> INSPECTOR'S INITIALS: ECS <br /> INSPECTION DATE:January 29,2020 <br /> OBSERVATIONS <br /> This was a routine monitoring inspection of the Ralston Quarry conducted by Eric Scott and Michael Cunningham of <br /> DRMS. Ralston Quarry is a 338.8 acre 112c permit operated by Asphalt Paving Company(APC) in Jefferson County <br /> approximately 2.25 miles north of Golden and 0.6 miles east of Hwy 93. Ben Langenfeld of Lewicki and Associates <br /> contacted DRMS to suggest that DRMS meet with APC at the site to observe the start of the slope stabilization project <br /> approved by DRMS as part of AM04, as well as to discuss some proposed changes to the design of the project that will <br /> be submitted to DRMS as a TR for approval. DRMS representatives met with Ben Langenfeld, consultant for APC,and <br /> Jim Krattenmaker,APC construction manager, at the site visitor parking area. The group proceeded to the west central <br /> area of the permit were work was commencing on the slope stabilization project. <br /> Work on the project had only begun recently, and at this time DRMS observed sediment and storm-water management <br /> features, exploratory test pits, staking of the placement of drainage pipe pathways, and the initial phase of removal of <br /> topsoil and overburden on the southern end of the work area(see attached photos 1-6). The piping that will be utilized <br /> to provide subsurface drainage has not yet arrived at the site. <br /> APC and their consultants are proposing minor changes to the project as approved based on additional field data <br /> collected prior to the commencement of excavation. These proposed changes will be detailed in a TR submitted to <br /> DRMS for approval prior to implementation. Assuming that the TR for the proposed modifications is received by DRMS <br /> in a timely fashion, and can be approved as submitted,the stabilization project field work is projected to take <br /> approximately 3-4 weeks. <br /> After a discussion of the stabilization project,the group moved to the working area of the quarry on the eastern side of <br /> the ridge. DRMS observed the current condition of the south area of the pit where surface water had been previously <br /> impounded. The permittee has re-graded the pit floor to minimize the area where runoff can collect, and has been <br /> pumping water from the pit to its approved discharge point. <br /> No other issues were noted during this inspection, and DRMS left the site to return to Denver at approximately 11:30. <br /> Inspection Contact Address <br /> Stan Opperman <br /> Asphalt Paving Company <br /> 14802 W 44th Ave <br /> Golden,CO 80403 <br /> Page 2 of 3 <br />