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Greg Lewicki And Associates, P LLC <br /> 33'75 XV Po%%e► , Circle Phone: ("2O)8.12-5321 Fax (303)346-6934 <br /> Littleton. (4)SO123 F-nu►il: info a le-t-ticki.hiz <br /> February 28, 2019 <br /> Ioana Comaniciu <br /> Colorado Division of Water Resources <br /> 1313 Sherman St, Rm 821 <br /> Denver, CO 80203 <br /> RE: Ralston Quarry Amendment No. 4 (AM-04) Surface Water& Groundwater Concerns <br /> Ms. Ioana Comaniciu <br /> Asphalt Paving Co. (APC; the permittee) received your letter dated February 11, 2019 regarding <br /> their recent amendment to the Ralston Quarry reclamation permit. In this letter, you noted two <br /> concerns that your office had with the quarry related to standing water identified by the Colo. <br /> Division of Reclamation, Mining, and Safety in their inspections and adequacy review. <br /> 1. Whether or not groundwater is seeping into the quarry, creating the standing water, and <br /> thus creating a groundwater exposure. <br /> 2. That stormwater runoff that is intercepted by the mining operation must be released to <br /> the stream system within 72 hours if not covered by a priority water right. <br /> APC has asked their geotechnical consultant on the quarry, Brierley and Associates, to comment <br /> on the possibility of groundwater infiltration into the quarry. Their analysis is attached. In <br /> summary: boring data demonstrates that the standing water observed at the bottom of the quarry <br /> is not representative of exposed groundwater. <br /> Furthermore, APC has committed to pump out the entire standing pool of stormwater runoff to <br /> their approved stormwater discharge pond to the south. This pumping will be conducted any time <br /> there is a build up of stormwater in the quarry bottom to prevent out of priority diversions. <br /> Please response to APC and DRMS regarding these topics. <br /> Sincerely, <br /> Ben Langenfeld, P.E. <br /> Greg Lewicki and Associates <br /> Ralston Quarry CDWR Comments 1 Cny;lxwic►i and Assoc•stm PLIA <br />