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<br />1.0 INTRODUCTION AND PURPOSE <br />This surface water monitoring and data analysis plan provides the means [o collect the data <br />necessary to demonstrate that closure of the OXY USA, Inc. Logan Wash Mine (LWM) is <br />both prudent and possible without adversely affecting receiving surface waters. The final <br />discharge of residual process water would be from the existing lined pond to a small tributary <br />of Roan Creek. The objective of this plan is to demonstrate that this discharge would have no <br />negative impacts on water quality of the receiving streams, including Roan Creek and the <br />Colorado River. <br />The LWM was a research and development site for the experimental production of petroleum <br />oil from oil shale (kerogen). Original plans called for production of 1,000 barrels per day of <br />oil with associated process waters to be mechanically treated prior to discharge. During pilot <br />operations, over 200,000 barrels of oil were produced. Pilot operations were discontinued in <br />1983, since that time, LWM has remained idle, in a maintenance mode. <br />This section addresses the following topics <br />• Logan Wash Mine Location <br />• Receiving Streams <br />• Plan Organization <br />1.1 LOGAN WASH MINE LOCATION <br />LWM is located in the NE 1/4 of Section 25, T7S, R97W, 6th P.M., approximately 5.5 miles <br />north of DeBeque, Colorado, as shown in Figure 1, LWM vicinity. The mine, located near <br />the headwaters of Logan Wash, has two portals which drain water to Logan Wash. Logan <br />Wash is an ephemeral stream which discharges to Roan Creek, a tributary to the Colorado <br />River. The two mine drains are currently permitted under the Colorado Discharge Permit <br />System (CDPS) as Outfalls OOI and 002, Outfall 002 is ephemeral with discharge rates of <br />less than 5 gallons per minute (gpm) most of the year, and higher flow rates during the spring <br />snowmelt period. The designated outfall structure for Outfa11001 is located directly within <br />Logan Wash, some distance from the actual drainage pipe. Although present, mine drainage <br />typically percolates into the ground and rarely reaches the designated outfall structure. <br />Discharge at the drainage pipe has not been measured. The third known source of mine water <br />