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III~II~II~il~~ll~ll <br />999 <br /> <br />STATE OF CO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmem of NaWral Resources <br />131 3 Sherman ai., Room ? 1 5 <br />Dem~er. Colorado 80_'03 <br />Phone: 13031 Pbb-356: <br />rv.~: uu31 e3z-slue <br />April 6, 1998 <br />RECEIVED <br />~gFtl~ ~ 9 1998 <br />Division of Minerals & Geolog <br />Jim Burchett <br />Southway Construction Company, Inc <br />117 White Pine Drive <br />Alamosa, CO 81101 <br />r DENVEP OFFICE <br />PUBLIC FILE COPY <br />FILE: ~_s~u-off <br />SITE: ~( <br />C/v-01 <br />Re: DeI Norte Pit, File No. M-84-026, Conversion No. 1 Second Adequacy <br />Dear Mr. Burchett: <br />~~~ <br />DEPART'v1ENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Gooemrn <br />iamea 5. Luc knead <br />6r[ulne Direil0~ <br />n1¢hael B Long <br />Gn ision Dueaur <br />The Division has reviewed Southway's response to the preliminary adequacy review of this conversion <br />application. Please respond to these additional concerns as soon as possible so that th May 26, 1998 <br />decision due date can be met. <br />1. As we discussed, please revise the maps to include the area within 200 fe t of the permit <br />boundary and ensure that all structures are shown, including ditches, fenc s, roads. This <br />includes structures on the opposite side of any roads or the canal. The stru lures and their <br />owners name must be shown on the pre-mining map. <br />2. Because the agreement with the Rio Grande Canal Water Users Association doe not guarantee <br />that water will be available for filling these recharge ponds, an alternate reclam lion plan must <br />be approved and accounted for in the reclamation financial warranty. The altern to reclamation <br />plan must address the problem of exposed groundwater. Options include back filling the pit to <br />prevent exposure of groundwater, or use of some type of structure which pre ents infiltration <br />of water into the pit. Because the pit seems to fill with water only when the c nal is flowing, <br />the water may be kept out of the pit by use of a slurry wall or impermeable lin r on either the <br />canal or the pit where they adjoin. Other structures may be effective in sto ping the water <br />flow into the pit. Use of this type of structure should allow retention o the increased <br />excavation depth. <br />3. Because this site is proposed to be a groundwater recharge site, groundwater q ality will need <br />to be protected by lining the hazardous materials spill containment str cture with an <br />impermeable liner. The trailers proposed for containment of hydraulic fluid, ntifreeze, etc., <br />must be adequate to completely contain spills of the contents within them, or th se trailers will <br />need to be stored within the fined spill containment structure. <br />4. Though the operation appears not to need an emissions permit, it may still be r quired that an <br />Air Pollution Emission Notice (APEN) and filing fee be submitted. Please noti the Colorado <br />Department of Public Health and Environment of this application. <br />5. The engineering demonstration of slope stability is adequate to show that strictures further <br />than 50 feet away from the excavation will not be damaged by the excavation. For structures <br />within that 50 foot buffer, adequate damage compensation agreements, r engineering <br />