2009-06-02_PERMIT FILE - C1982057A (6)

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were performed. Aquifer test data is found in Appendix 7-3, Tab 7. Ground water levels are • measured with an electronic water level indicator. Water levels in some shallow alluvial wells are measured directly with a steel tape. Five wells were completed in 2001. These W-24 series wells (see Table 15-2) monitor the Sage Creek/Wolf Creek overburden, coal and underburden. These wells failed in a landslide that occurred in the spring of 2003. The well casings were all bent below ground surface (at around twenty feet deep). This prevented abandonment of these wells by normal methods. In October 2003, a gravel trench drain was established around these wells to direct water flow from the broken well casings away from the toe of the Pond 016A dam. In August 2007, these wells were abandoned by pressure grouting cement into the upper portions of the well casing. In September 2004, replacements for the W-24 series wells were completed. Details for these W-25 series replacement wells are provided here in Table 15-2 and in Appendix 15-3A. In addition, well completion diagrams and lithologic logs may be found in Tab 7, Appendix 7-1. Ground Water Quality Sample Handling, Preservation, and Analysis. The ground water parameter list • is contained in Appendix 15-2 (Pre-October, 1991 Hydrologic Monitoring Program). The types of samples, preservatives, and bottles used in the monitoring program are contained in Appendix 15-1. Raw/non-acidified and/or raw acidified water samples are taken from the sampling site and placed into specially prepared sample bottles. Dissolved constituent samples are filtered in the field with a 0.45 micron membrane filter. Water samples are chilled by packing the bottles in iced coolers, and then they are promptly taken to an EPA certified laboratory for chemical analysis. All water samples are field tested for pH, temperature, and electrical conductivity at the time they are collected. The pH meter is calibrated before each day's use by performing a two-point calibration using pH 7.0 and 10.0 buffer solutions. Single point calibration checks are performed in the field. Conductivity meter calibrations are routinely verified using potassium chloride solutions varying in strength from 1000 up to 3000 umhos/cm, depending on the availability of the solutions from select vendors. Field conductivities reported prior to the end of water year 1989 are not temperature compensated. Peabody acquired a new conductivity meter with an automatic temperature compensation probe as of October, 1989. The new conductivity meter is calibrated before each day's use. Sampling protocol is reviewed and maintained in a systematic fashion that delivers reliable data. Peabody will continue to implement improvements in sampling protocol to minimize errors affecting • field chemistry measurements and sample collection. TR-62 11 Revised 01/09