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9-13 <br />coal seams can locally contain water if the recharge capacity <br />• and fracture system are developed. No springs or seeps from <br />the bedrock above the local streambeds were observed during <br />the field investigation. <br />The proposed mine facilities will be contained within the <br />valley bottom and will not impact bedrock outcrops. Therefore, <br />no monitoring wells were installed in the bedrock aquifers. <br />9.2.2.2 Groundwater Quality <br />Groundwater samples were collected and analyzed according to <br />the requirements of the Colorado State MLR from the monitor- <br />ing wells MW-1, MW-2 and MW-4 located in the East Salt Creek <br />alluvium. Two monitoring wells, MW-3, installed in Munger <br />Creek alluvium, and MW-5 (BH-1), installed in alluvium of <br />the valley proposed for the refuse disposal, were dry at the <br />time of groundwater quality samples collection. <br />• Groundwater quality samples collection and analyses were per- <br />formed according to the handbook "The Determination of the <br />Probable Hydrologic Consequences" prepared by OSM in May, <br />1980 and according to a list of parameters to be analyzed, <br />prepared by Colorado MLR. (This list has been modified since <br />sampling occurred.) <br />The results of groundwater quality monitoring for a period <br />from April, 1981 to November, 1981 with a total of three <br />quarterly samples are listed in Table 4.3-25. Groundwater <br />quality monitoring indicated that water is of sodium sulfate <br />type with a range in total dissolved solids (TDS) between <br />2,778 and 12,500 mg/1. Variability of TDS content with the <br />seasons is approximately within 2,000 mg/1 in all sample <br />locations. There is a significant deterioration of ground- <br />water quality in the downstream direction and with increasing <br />distance from East Salt Creek. <br />• <br />