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The piezometer data ties in relatively well with the underdrain data. P1 <br />(north) shows moderately elevated water levels and the north underdrain <br />discharges minimally and infrequently, suggesting some clogging of the <br />system. P2 (middle) is dry and undetectable flow was observed from the <br />underdrain. I can not find a pre-mine topography map, but it would appear <br />that the middle piezometer and drain sit on a slightly elevated drainage <br />divide located west of the top of the bench and P4, and that water flows <br />either north or south. P3 (south) shows the lowest water level elevations <br />with respect to the coaly waste and the south underdrain discharges the most <br />water, suggesting good drainage through that portion of the fill. The fill <br />located at the top of the bench is not hooked into the underdrain system, and <br />consequently we observe the highest water levels above the coaly waste from <br />this piezometer. <br />Recommendations: <br />I would recommend that Blue Ribbon Coal Company modify their hydrology <br />monitoring and annual report in the fallowing areas: <br />~~, 1 Blue Ribbon currently monitors flow only at the North, upstream, <br />~ "~~ end of the site and not at the downstream end of the site. This is <br />not a standard monitoring practice. I would recommend that Blue <br />~a~ ~*,-- Ribbon also monitor`~q°a`~ the south Hubbard Creek surface water site <br />`~ or provide documentation why this is not possible or necessary. <br />The location of Blue Ribbon's water monitoring sites seem to be <br />documented on at least two maps and I can not find the location of <br />P4 on aRy map. Correspondence suggests that the lower Hubbard <br />Creek site has moved from 3000' downstream to the permit boundary. <br />Is this true? It would clarify the permit substantially to have <br />all monitoring sites shown on one map. <br />3. The documentation of the unit used in flow rates of springs and <br />underdrains is erratic. It would clarify the annual hydrologic <br />report if the flow unit was always designated (i.e. <br />cfs,gpm,ac-ft,etc). <br />4. Historic plots of water level in the bench piezometers would <br />facilitate review of the information. <br />Compliance with Approved Iydrologic Monitoring Plan: <br />The fydrologic Monitoring Plan for the Blue Ribbon Mine is located on pages 39 <br />and 124 in the permit and in the Technical Revision on bench monitoring <br />submitted April 30, 1985. These plans are poorly worded but have subsequently <br />been revised by afar clearer May, 1987, revision of pages 124 and 124a. <br />Although Blue Ribbon missed some monthly flow monitoring in the first half of <br />1987, they performed additional complementary monitoring of field parameters. <br />In addition, they performed more detailed monitoring than required in 1986. <br />Therefore, monitoring during 1987 was predominately in compliance with their <br />plan. <br />5924E <br />