Laserfiche WebLink
1. The Division will require that all acid- or toxic-forming spoil is <br />buried or otherwise treated, as discussed above. Burial within <br />thirty days is not feasible and the delay will not result in any <br />material risk of water pollution or other environmental damage. <br />(4.05.8(3)). <br />E. Surface and Ground Water Monitoring <br />Seneca Coal Company has devised a water monitoring plan that will <br />enable the Division to determine what, if any, impacts the operation will <br />have on the prevailing hydrologic balance. The plan is described in detail <br />in Tab 15 of the permit application, and summarized briefly in tables 1-4 <br />in this document. <br />1. The applicant will conduct monitoring of ground water in a manner <br />approved by the Division. The ground water monitoring plan is <br />listed in Tables 1 and 3 of this document. (4.05.13(1)). <br />2. The applicant will conduct monitoring of surface water in a <br />manner approved by the Division. The monitoring plan was <br />submitted under 2.05.6(3)(b)(iv) and is listed in Tables 2 and 4 of <br />this document. (4.05.13(2)). <br />F. Probable Hydrologic Consequences <br />Probable hydrologic consequences of the Yoast mining operations are <br />discussed in Tab 17 of the permit application package. A summary of that <br />discussion is presented here. <br />Groundwater <br />The probable hydrologic consequences to groundwater resulting from coal <br />extraction at the Yoast Mine include drawdowns to aquifers from pit <br />inflows, and subsequent pit dewatering and production well pumping as <br />well as impacts to groundwater quality resulting from flow through mine <br />spoil. Seneca's predictions of the magnitude of these impacts are <br />discussed below. <br />Groundwater Inflows to Pits and Associated Drawdowns <br />The Yoast Mine will intercept the following hydrologic units: the Wadge <br />Overburden, Wadge Coal, Wolf Creek Overburden, and Wolf Creek Coal. <br />Seneca Coal Company used two models to predict pit inflows as a result <br />of mining activities. The models were the McWhorter (1982) method and <br />the Theis equation, both of which are described in detail in Tab 17 of the <br />PAP. The Theis equation, which was also used to predict drawdowns, <br />Yoast Mine 24 December 15, 2010