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~ • • <br />experienced during the last 4 years as described in the <br />precipitation tables in the AHR Appendix B and restated on page 10 <br />of the AHR report. <br />Manganese levels were exceeded in alluvial wells GW-56-A,S32-A, <br />S33-A, S46-A, S31-A2, S68-A and 569-A, Wolf Creek Overburden well <br />GW-S7-WCO and spoil wells 526-5, S27-S and 561-5 as stated on page <br />9 and A-20,21. <br />High boron levels were detected in alluvial well GW-S32-A, Wadge <br />coal well GW-S19-W and spoil well GW-561-5 although all are within <br />the standard for irrigation of .75 mg/1. <br />Fluoride levels were exceeded in wells GW-S11-U and GW-519-W, <br />exceeding the standard of 2.0 mg/1. <br />pH levels for the most part, remained within the 6.5 to 8.5 <br />acceptable standard, except for two wells which exceeded 8.5, GW- <br />S8P1-U and GW-S11-U, both underburden wells which were predicted in <br />the permit to contain high alkalinity values. <br />SAR values range between a low of .03 at well GW-S7-WCO to a very <br />RATER TYPE <br />One well, GW-S32-A in the Little Grassy Creek alluvium exceeded <br />iron standards in June 1991 by .14 mg/1 above the 5.0 mg/1 <br />standard. ~ w~L 7 <br />high value of 28.51 at well GW-S19- ! High SAR values are also <br />seen in wells GW-S17W with 10.51, G 19-W WITH 20.90, GW-SSPI-U <br />with 16.05. <br />lv uw ' <br />Water type was also studied. A calcium-magnesium-sulfate water <br />type is found in the alluvial wells. According to Jeff Martin's <br />memo, wells GW-S31-A and 32-A were to be monitored monthly and this <br />practice was discontinued in 1988 with no explanation. It is the <br />concern of this reviewer that since these wells monitor a source of <br />natural recharge waters and as such are part of the alluvial system <br />native to the valley, that monthly monitoring be reinstituted on <br />these two wells or a valid explanation of why this practice has <br />been discontinued be provided to the Division for review. <br />All water types in the groundwater wells are generally high in <br />sulfate with the exception of GW-58-U in the underburden which is <br />sodium-bicarbonate nature. This well has shown a shift in water <br />type from sodium-bicarbonate to calcium-bicarbonate. An associated <br />well, GW-S11-U shows no such fluctuation and is also predominately <br />sodium-bicarbonate in nature. <br />