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Logan Wash Mine TR No. 8 <br />1.0 Introduction <br />This technical revision JR) presents proposed changes to the original Logan Wash Mine Permit <br />(No. M -77 -424 — Exhibit E and F, Reclamation Plan and Map or "Plan "). The proposed changes <br />involve the construction of two infiltration trenches on a previously impacted area. The trenches <br />are to be used for the infiltration of mine water discharge from the L -1 portal ( Outfall 00 1) and <br />the Research Mine ( Outfall 002). Both trenches will be located near existing pipelines for these <br />mine waters on the Lower Bench. <br />Currently, mine water discharge is permitted at Logan Wash Mine through the Colorado <br />Department of Public Health and Environment (CDPHE) Water Quality Control Division <br />(WQCD) under a Colorado Discharge Permit System (CDPS) permit (No. 000048816). The <br />permit allows for mine water discharge from two sources: Outfall 001 from the L -1 portal (the <br />main lower bench entry), and Outfall 002, the Research Mine portal. Discharge of Outfall 001 <br />occurs through a 2 -inch HDPE pipe that conveys water from a French drain in the main L -1 <br />entry. From the L -1 entry the pipeline extends to and is valved in the Lower Bench Vault. From <br />the vault, the pipeline is buried in a trench on the Lower Bench and daylights in Dry Gulch <br />where the water discharges. The Outfall 002 pipeline originates at the Research Mine portal and <br />is also connected and valved within the Lower Bench Vault before it extends to and daylights at <br />the top of a riprapped storm channel on the Lower Bench. No discharge has occurred from <br />Outfall 002 since the Research Mine portal was sealed in 2004. Occidental Oil Shale, Inc. <br />(OOSI) intends to terminate the CDPS permit at the mine as part of the overall mine closure <br />program <br />Under the Memorandum of Agreement (MOA) for the Implementation of SB 181 Amendments <br />to the Colorado Water Quality Control Act (25 -8 -101, et seq) Pertaining to the Regulation of <br />Mineral Mines (Dec. 14, 2010), DRMS attains jurisdiction at permitted mines for the adoption of <br />rules and regulations for establishing points of compliance for discharges to state waters other <br />than point sources to surface waters and establishment of adequate monitoring requirements to <br />confirm compliance with applicable surface and ground water classifications and standards as <br />established by the Water Quality Control Commission (WQCC). <br />Through the MOA cited above, infiltration of mine water discharge is an accepted and practiced <br />process in Colorado and is being implemented at numerous mine sites. Infiltration of mine water <br />discharge is consistent with maintaining the hydrologic balance with respect to groundwater in <br />the vicinity of the mine. <br />The purpose of this TR is to describe the plan to construct and operate an off-channel infiltration <br />trench for mine water discharges at Logan Wash Mine. This TR presents background <br />information in Section 2.0, project rationale in Section 3.0, water quality in Section 4.0, waste <br />dump stability in Section 5, trench construction in Section 6.0, erosion control in Section 7.0 and <br />trench reclamation in Section 8.0. <br />Western Water & Land, Inc. <br />