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Groundwater monitoring sites have included monitoring wells, MW -8, 10, 16, <br />23, 65, and NW. These wells specifically have been used to monitor water <br />levels and quality in the Jack O'Lantern and Red Arrow Coal Seams. Water <br />levels will be measured in all active monitoring wells on a semi- annual basis. <br />In addition, water quality samples will be collected and analyzed on a <br />semi- annual bass. In the time period, 1996 -2000, ongoing monitoring <br />indicated that Wells MW -8 and 10 had caved and were on longer viable <br />monitoring wells. In 2003, the inactive North Dewatering Well was converted <br />to a monitoring well (MW -NW) to provide an additional monitoring point to <br />track progressive mine flooding, water levels and water quality. The North <br />Well is located at the low point (elevation 5,855 of the 1st North Sub - Mains. <br />In order to assure compliance under applicable provisions of Southfield's <br />NPDES permits for both mine and loadout area discharge points, EFCI will, <br />during periods of active flow, monitor discharge on a weekly basis, obtain <br />grab samples for settleable solids, and measure pH at the time of flow <br />monitoring. If there is any visible sheen on either the pond surface or <br />downstream from the discharge point, a grab sample for oil and grease will <br />also be obtained. In addition, in order to assure that sedimentation ponds are <br />functioning properly, EFCI will obtain water quality samples at discharge <br />points on a monthly basis if discharge occurs and will analyze samples for <br />total suspended solids and total iron. <br />Both surface and groundwater quality samples will be collected, labeled and <br />transported to a qualified analytical laboratory for analyses. Proper sample <br />collection, preservation, handling, and storage methods will be utilized at all <br />times to preserve the integrity of the samples and ensure validity of analysis <br />results. Water quality samples will be analyzed for the specific parameters <br />listed in Exhibit 25, Hydrologic Monitoring Plan. All water data will be <br />collected <br />MR -60 2.05.6 -53a Revised 03/2013 <br />