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Adequacy Items <br />SHB AGRA Project E92-7075 <br />_ ~~5„~~ Page 12 <br />. i' Bi <br />Attachment 12 contains a map showing the location of the monitoring stations as well as <br />the water quality data from station SVC-2. <br />e. The operator had stated on page 3 that surface water quality data was collected on <br />a quarterly basis starting in June of 1990. However the water quality data provided <br />on Table GS is for June 1990, September 1990 DFSWl; for June 1990, September <br />1990 and December 1990 for DFSW-2 and DFSW-3. Where is the rest of the data? <br />Why was there no data collected in early May when spring runoff is at the <br />maximum? <br />At a minimum four quarters of data should be provided to properly evaluate <br />seasonal variations. If there were no flows during a quarter, it should be reported <br />as such. <br />Four quarters of surface water quality sampling were performed at DFSW-1, DFSW-2, <br />and DFSW-3. Attachment 13 wntains the complete table of results. <br />In Table G6 are the Dowe Flats water quality concentrations. Are these averages <br />for DFSW-1, DFSW-2, and DFSW-3? If not, where did the figures come from? If <br />the data is the averages of the above stations, please explain in detail how it was <br />• divided because some of the numbers do not make sense e.g. Temperature column <br />bas the following numbers: 226, 55, 86.9. The only explanation at the bottom of <br />the page states, "Concentrations are highest values recorded or highest and lowest <br />for the station over three quarters of monitoring ground water. <br />The figures in the last column of Table G-6 are the highest recorded value at each <br />surface water monitoring station over three quarters of monitoring. The first column is <br />DFSW-1, the second column is DFSW-2 and the third column is DFSW-3. The <br />temperatures row is a typographical error. Please use the Tables contained in <br />Attachment 14 for wmparisons to drinking water standards. <br />f. On page 8 the operator stated that "because of the thickness and the low <br />permeability of the Niobrara Formation, it is anticipated that none of the deeper <br />aquifers below the Niobrara will be impacted by the proposed quarry." The <br />Division can not accept this statement without the appropriate ground water <br />modeling which will show that the operation in relation to the deeper aquifer. <br />The plan is for mining of the Fort Hays Limestone to be completed at a depth of 125 feet <br />below the existing ground surface. The existing static water levels in alluvial aquifers <br />range from 25 to 30 feet below the existing ground surface. Mine dewatering will be <br />performed to suppress the areal water table below the base of the Fort Hays Limestone. <br />• A survey of existing ground water wells near the Syntex Landfill (Report to Snytex <br />performed by IT Corp., September 1988) identified ten wells which were completed in <br />~^ A G R A <br />Earth & Environments/ Group <br />