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•; <br />• MINOR REVISION N0. 7 NOV12 }~ <br />Temporary Shower and Gray Water Plan <br />Coal Ridge No. 1 <br />November 11, 1985 M11~ IANO RECLAMAT'JQN <br />RECEIVE® <br />Colo. Oept of Hetual R~sourcea <br />Minor Revision No. 7 concerns the location of the temporary <br />shower facility and the handling of the gray water subsequently <br />produced. The attached map and figure present the location and <br />design of the facility. The facility will be operated during the <br />construction phase of the mine or until the permanent bathhouse <br />is available. <br />It is proposed that the temporary shower, which is a 10' X 30' <br />trailer, be situated on the lower side of the employee parking <br />lot as shown on the attached map. The site will be graded and <br />covered with gravel prior to installing the temporary shower. A <br />four inch pipe will drain the shower to a temporary gray water <br />impoundment. Surface drainage and sediment coming from the site <br />will be directed into Pond A. <br />• Gray Water <br />Gray water will be conveyed in a four inch pipe from the shower <br />to a temporary impoundment. The design for the impoundment is <br />presented on the attached figure. It has a retension time of 30 <br />,01 days. During the 30 day period, the gray water will be sampled <br />,~P ~ and compared to the quality standards contained in NCEC's NPDES <br />/~,~ ,~ permit. If the quality of the gray water meets or exceeds these <br />I~ ~~ ~ standards, then the gray water will be pumped from the pond and <br />~~ ~~ applied evenly to the land area shown on the attached map. The <br />,~ ~ ~ land application area will be chisled to a depth of approximately <br />~~ 24" on 2-foot centers to accelerate infiltration. The gray water <br />3~ will be spread across the upslope edge and allowed to flow over <br />~ the area. This method of discharge is approved by the Colorado <br />Department of Health if it is documented by proper sampling and <br />analysis that the gray water meets the water quality standards <br />specified in the NPDES permit. if the gray water fails to meet <br />the standards, it will be treated to the extent necessary to <br />qualify for land application discharge. <br />The gray water impoundment will be constructed by first removing <br />the topsoil and stockpiling it adjacent to the pond. <br />Approximately five feet of material will be excavated and about <br />two feet of freeboard will be constructed of the cut material. <br /> <br />