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Mr. Joe Dttdnslt <br />Jnttuary S, 1994 <br />Page 2 <br />in other sump areas. These sump areas have the capacity to hold several days of mine <br />inflow water. This system is not anticipated to change as coal production increases, however, <br />Basin will respond to any change in mine water conditions as these situations develop. <br />5. Basin has taken several measures to bring the mine water discharge into <br />compliance. First, water is handled at the underground face and routed to the sump areas <br />in which settling may take place before it is pumped to the surface. Second, the surface floc <br />system is maintained to ensure appropriate treatment to allow rapid settling of suspended <br />solids. Third, Pond 005 has been repaired which will allow for additional holding capacity <br />and settling time. Overall, these measures have been successful in achieving compliance of <br />the mine discharge. <br />Mid Term Review <br />3. Hydrology <br />A) Station SCF-1 is a surface water flume not a well. Limited longwall mining began in <br />Santistevan Canyon in May 1991 and the station was activated during the spring and seep <br />survey in August 1992. Results of the 1993 monitoring will be presented in the Annual <br />Hydrology Report which is due to be submitted by February 28, 1994. <br />B) As referenced above, applicable updates of Water Users Information are attached <br />for the Divisions review and approval. <br />C) Limited longwall mining begin in the Santistevan Canyon area in May 1991 and thus, <br />no spring and seep sampling was conducted at Station SCF-1 during 1991. Recent sampling <br />data will be provided to the Division in the 1993 Annual Hydrology Report which is due to <br />be submitted by February 28, 1994. <br />D) Since an Annual Hydrology Report is submitted to the Division each year, Exhibit 10 <br />is proposed to contain the attached page which refers the reader to the Annual Hydrology <br />Reports which are filled separately from the Permit Document. <br />E) Attached is the renewed NPDES Permit which will update Exhibit 22. <br />F) Well PAW-7 was installed to monitor Pond 005 and to assess potential effects of mine <br />water infiltration into the AVF. Since this well is located between Ponds 003 and 005, any <br />mine water infiltration from Pond 003 would also be detected. As such, there is a direct <br />correlation between the water in Pond 003 and the water sampled from well PAW-7, <br />however, projected impacts to the AVF system are anticipated to be minimal because mine <br />