Laserfiche WebLink
~~ <br />• <br />V. Hydrologic Balance - Surface Water - Rules 2.04.5, 2.04.7(2), <br />2.05.3(4). 2.05.4. and 4.05 <br />Information on surface water hydrology is contained in Sections 3.3.5, 3.3.6, <br />3.3.7, 4.2.9, and 4.5.3.1, Exhibit 2.6-3, and Appendix 4.2-I of the permit <br />revision application. <br />The entire 4.35 acre site is previously disturbed, and is covered with <br />approximately 10 inches of gravel. Approximately 3.6 acres will drain to the <br />single sediment pond, which will be constructed at the southwest corner of the <br />permit area, and which is designed to contain the 10-year /24-hour runoff <br />event without discharging. A small area at the southern end of the site will <br />be bermed as a means of alternative sediment control, also with containment of <br />the 10-year runoff event. The applicant has obtained a valid NPDES permit <br />authorizing discharge from the sediment pond. Hydrologic calculations for all <br />surface water control structures are located in Appendix 4.2-1 of the <br />application. <br />An existing system of upland diversions and culverts will route drainage from <br />the adjacent undisturbed terrain. Runoff evaluations were submitted by the <br />applicant for these structures, which will meet the requirements of Rule 4.05. <br />Adequate information on the regional surface water resources of the Colorado <br />River is contained in the approved permit application for the Coal Ridge <br />No. 1 Mine. <br />The application is in compliance with the requirements of this section. <br />VI. Hydrologic Balance - Ground Water - Rules 2.04.5, 2.04.7(1) <br />2.05.3(4), 2.05.6(3), and 4.05 <br />--------------------------------------------------------------- <br />Ground water occurrence in the permit and surrounding area is described in <br />Sections 3.3.3, 3.3.4 and 4.5.3.2 of the application, and also in the approved <br />permit application document of the Coal Ridge Mine. <br />The proposed loadout site is located on the surface of an alluvial fan <br />approximately 15 feet topographically above the Colorado River. A monitoring <br />well (LO-1> established by the applicant encountered water at approximately 8 <br />feet below the surface. Water quality is poor, with Total Dissolved Solids <br />concentration of approximately 5000 mg/l. A documented sample from a nearby <br />well operated by Ideal Basic Industries confirms the poor water quality. <br />The Colorado River alluvium provides nearly all of the ground water supply in <br />the area of the proposed loadout, and is of much better quality than that <br />sampled in well LO-1. Based on available information, it appears that the <br />water encountered below the loadout site is perched, originates north of the <br />permit area in bedrock, and discharges into the Colorado River or its alluvium <br />just south and downgradient of the permit area. <br />The application is in compliance with the requirements of this section. <br />-6- <br />