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• value of 3760 mg/1 was observed this year. For well wOV17, a value o£ 4295 mg/1 <br />wee Dredicted, while a value of 8630 mg/1 was observed this year. <br />The predicted value for well 91OV17 (4295 mg/1) was predicated on a 5.5'Y increase <br />of the Draminiag value of 4072 mg/1, which is an average of several overburden <br />walla. However, well wOV17 exhibited a premiaiag TD9 average value of 8043 <br />mg/1, while the next highest TDS wedge overburden well (wOV15) had a baseline <br />TD9 average of 3741 mg/1. well wOV17 also exhibited a high degree o£ baseline <br />TDS variability (min. = 6860, max. = 8586 mg/1). While the average TDS valve <br />Chia year (8630 mg/1) exceeded the PHC Dredictioa using the average baseline <br />value (8043 + S.Sk = 8485 mg/1), this value ie below a S.Sh iaereaae of the <br />maximum baseline TDS value (8586 • 5.591s = 9058 mg/1). Also, ae explained <br />previously in the slluvivm section, calculated TD8 values era of tea preferable <br />to measured TD9 values. The ealculate8 TDS average value this yesr was 8080 <br />mg/1. More date will ba needed to evalusta the long-term TD9 tread. <br />- wedge Conl. Four wells monitor the Wedge coal seem. well wW14 exhibits a <br />• recently increaeiag TD9 trend. Well ww16 did not have enough water is it to <br />sample this year. Ia Daat years it displayed 9II increaeiag TDS tread. well <br />ww17 exhlbite a nearly level TDS trend. well ww4 exists is the II-w South <br />Expansion area. Monitoring at this well was resumed is July 2997 after being <br />dieeontiaued is June 1985. This wall, eo far, hne not been impacted by mining. <br />The 9eaeca II-w YHC predicts as annual average TD9 value of 2630 mg/1 for well <br />ww14, while s value of 4195 mg/1 (3875 mg/1 calculated) wee observed this year. <br />For Well Ww17, a value of 3002 mg/1 was predicted, while a value of 675 mg/1 was <br />observed this year. <br />Ae noted is the previous paragraph, well ww14 exDerieaced this year a TD9 <br />exceadeace of the pHC prediction. This prediction was based on several <br />assumptions. 1) Baseline water quality values ware an average o£ all wedge coal <br />wells at Seneca II-w. 2) Aquifer characterietice were as average of all wadga <br />coal walla at Seneca II-w. 3) The wadga coal seam was saturated for its entire <br />thickaesa (11.8 feet). <br />• <br />7 <br />