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<br />1.0 INTRODUCTION <br />This technical revision to mine permit 77-424, has been prepazed by Western Water & Land, Inc. <br />(WWL) for Glenn Springs Holdings, Ina (GSHI), property manager for Occidental Oil Shale <br />(OOSI) and subsidiary of Occidental Petroleum Corporation (Occidental). GSHI is in the process <br />of evaluating options for the permanent closure of its Logan Wash Mine property, located <br />approximately 12 miles north of DeBeque, Colorado (Figure 1). A critical component of mine <br />closure is the management of mine drainage water. Water draining from the in situ retorts in the <br />mine is currently being treated by evaporation in anon-discharging pond. This technical revision <br />describes the proposed actions and rationale for constructing a passive pilot water treatment <br />system to treat discharging retort water at the Logan Wash Mine. The purpose of the pilot <br />treatment system is to assess the effectiveness of a passive technology in treating retort-drainage <br />water from the mine. <br />This technical revision presents site background information, a summary of water quality and <br />discharge data, design and installation plan for the pilot treatment system, and monitoring plan to <br />be implemented during operation of the pilot treatment system. <br />2.0 Site Background <br />Logan Wash Mine is located approximately 12 linear miles north-northeast of De Beque, <br />Colorado, in Township 7 South, Range 97 West, Section 25. OOSI initiated efforts to develop an <br />experimental oil shale extraction process at Logan Wash in 1972. The mine was operated and <br />produced shale oil from the Green River Formation using the underground retorting process <br />(modified in situ or MIS) through February 1983. <br />Since 1983, Occidental has overseen maintenance of the mine property. Maintenance has <br />primarily included monitoring and sampling of two permitted (NPDES) sites for mine water <br />discharge and an evaporation pond that receives mine retort water. Other maintenance work <br />includes periodic inspection and repair of mine roads, portal benches, barriers, and mine water <br />discharge piping and inspection of the general mine conditions and evaporation pond. OOSI has <br />also completed reclamation on all but 3 portals and other surface disturbed areas that aze no <br />longer needed. <br />