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Transit Mix Concrete Co. <br /> Transit Mix has successfully operated their other quarries with similar NPDES discharge permits and is <br /> confident they can operate the HRR quarry within the permit limitations. <br /> Dust is regulated by CDPHE Air Quality Division (AQD); it is not regulated by the Division. Regardless,to <br /> address the comment,Transit Mix will obtain and comply with the limitations specified in their Air <br /> Pollutant Emission Notice (APEN). Dust will be controlled on the site using water trucks to limit dust on <br /> roads and water spray bars to limit dust from processing operations. These practices have been <br /> demonstrated to control dust at quarry operations throughout El Paso County, Colorado, and the entire <br /> country. <br /> Sediment will be controlled using the sediment detention basins, and water discharged from the basins <br /> will meet NDPES effluent limits established by CDPHE to prevent negative impacts to the receiving <br /> stream. Also,the sediment detention basins were designed following EPCDCM guidelines,which have <br /> been proven to properly control sediment in the El Paso County area. Large rain events(greater than <br /> the 5-yr event) have a longer detention time period allowed by DWR, and this extended detention time <br /> allows for the removal of the additional sediment that occurs during large storm events. <br /> The operation will follow the guidelines established in the Hazardous Materials Management Plan <br /> included in Exhibit T to prevent an unauthorized release of pollutants. Hazardous materials used at the <br /> quarry are limited to fuel,oil, grease, and other petroleum products and explosive materials. These <br /> types of products would be detected by the Total Petroleum Hydrocarbons (TPH) parameter or the <br /> Nitrates+ Nitrites parameters. Thus,the materials listed in the plan are included in the monitoring plan. <br /> Transit Mix commits to complying will all permit monitoring requirements. <br /> Objection: According to 116 (e), all refuse shall be disposed of in a manner that controls unsightliness <br /> or the deleterious effects of such refuse. The designs for stockpiles F1 and F2 are clearly visible from <br /> properties in Eagles Nest. <br /> Response: It is assumed that the statute referenced is actually 116 (4)(e),which relates to the details of <br /> the reclamation plan. The reclamation plan discussed in Exhibits D and E and presented on the figures in <br /> Exhibits C and F clearly indicates that the fines stockpiles will be graded and vegetated. This controls the <br /> unsightliness and deleterious effects of the stockpiles. <br /> Objection: The application includes a stability evaluation, but"from the historical record at Pike View <br /> Quarry that stability analyses performed by the applicant's engineers can be WRONG". <br /> Response: There are two very important facts to consider related to this comment. First,the engineers <br /> that performed the stability evaluation at the Pikeview Quarry are not working on the Hitch Rack Ranch <br /> Quarry project in any manner. Second,the geology at Pikeview Quarry and the HRR Quarry are <br /> fundamentally different and cannot be compared in any manner. Pikeview has steeply dipping <br /> sedimentary rock,while HRR Quarry contains massive but fractured igneous and metamorphic rocks. <br /> Norwest Corporation,the professional, registered, engineers tasked with evaluating stability at HRR <br /> Quarry,evaluated the rock strength,fracture orientations, and pit configurations while evaluating the <br /> stability of the pit walls. Similarly,the strength of the fines material was evaluated by Norwest while <br /> Hitch Rack Ranch Quarry Response to Comments <br /> March 9,2018 20 <br />