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HYDROLOGY IMPACTS 1988 <br />• GROUNDWATER-EXISTING MONITORING AND IMPACTS <br />Near Surface Colluvial-Alluvial Groundu+a ter <br />Springs monitored during 1988 were a continuation of the monitoring program from <br />the previous year. Spring and Pond 13-6 was within the area of influence of be- <br />ing considered undermined if pillar extraction had occurred within the II West <br />Submains. Even though this spring is less than 500 feet in overburden depth, <br />mine plans are based on advance development only within this area. <br />Generally, all spring flows were controlled by the mount of precipitation sub- <br />sequent percolation and runoff during the year. Flows of all springs within the <br />permit area were small generally less than 1.0 cfs. <br />Physical and chemical parameters were also a function of the amount of precipi- <br />tation and runoff during the year. <br />No effect on spring flow has been evidenced due to mining. Most of the re- <br />sources are greater in depth than 500 feet from the underground workings. <br />No shallow monitoring wells were undermined during 1988. Elevation of water <br />levels within these wells have changed little from the previous few years. <br />Water levels will change during the year due to precipitation recharge. <br />• Bedrock Groundwater <br />Groundwater depth from the surface was monitored from DH-58, 60, 65, 69, 70, <br />and GR77-7 during 1988. DH-58 and GR77-7 remained dry through the months that <br />monitoring was implemented. All other drill holes had insignificant water lev- <br />el changes except for DH-70 which varied approximately 30 feet throughout the <br />monitoring term. <br />• <br />