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Information regarding design of ponds and diversions is provided in Tab 13 of the <br />permit application. <br />Pond 005 was permitted as a permanent impoundment that treats runoff from 285 <br />disturbed acres which drain to Dry Creek. <br />Pond 006 was permitted as a permanent impoundment that is located in a watershed <br />that is tributary to Hubberson Gulch. Phase I construction of the pond was <br />completed in 1989. Phase II consisted of modifying the existing principal spillway <br />to increase the storage capacity of the pond. Phase III included construction of a <br />clean water diversion ditch that will divert 102.6 acres of undisturbed azea into the <br />drainage to the west. <br />Pond 009, a temporary sediment pond, treats runoff from the smaller disturbed area <br />which drains to Sage Creek, roughly a 439 acre watershed. Construction of the <br />pond was completed in 1991. <br />Pond 015 was constructed during the summer of 1999 in preparation for development <br />in the Seneca II-W south extension azea. The pond treats runoff from a 407 acre <br />watershed that drains into Sage Creek of which only 29.5 acres will be disturbed by <br />mining activities. <br />Pond 016 is proposed for construction in the Seneca II-W south extension azea. The <br />pond will treat runoff from 382.2 total acres of which 77.3 will be disturbed land. <br />Discharge from this pond will go into an unnamed tributary of Hubberson Gulch. <br />Pond 017 is also proposed for construction in the Seneca II-W south extension azea. <br />This is the southernmost pond. It will treat runoff from a 955 acre watershed, of <br />which approximately 30 acres are proposed to be disturbed. This pond drains into <br />Hubberson Gulch. <br />D. Acid-forming and Toxic-forming Spoil <br />The applicant has submitted detailed analysis of the geochemical characteristics of <br />the overburden and interburden found in the Seneca II-W Mine permit azea. The <br />sampled parameters were agreed upon by the Division, OSM and Seneca Coal <br />Company during meetings held in 1980 and 1981. Parameters sampled aze listed in <br />the permit application Volume 2, Tab 6. The permit application states that these <br />parameters were used to, "document the physical and chemical properties of the <br />overburden and underburden, to compaze these properties to ground water quality, <br />and to determine potential reclamation success." <br />The data obtained from the geochemical analyses were compared to criteria derived <br />from State and Federal agencies (USDA, BLM, Wyoming DEQ, and others). The <br />Seneca II-W Findings Document 1g November 3, 1999 <br />