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May 1998 after being discontinued is October 1995. It displays oa iacreaeiag • <br />TD9 trend. <br />In the Probable Hydrologic Coaaequeacea section (PHC, Tab 17) of the Seaoca II-w <br />PAP, predictions were made for the Jvae-September average TD9 valued at various <br />alluvial wells. Ia the Hubberson Gulch alluvium at well wtlAL7-2, a value of <br />1299 mg/1 wan predicted, while a value of 1350 mg/1 was observed this year. Ia <br />the 006 Gulch alluvium at Well wHAL10, a value of 3394 mg/1 was predicted, while <br />a value of 2580 mg/1 mac observed this year. In the gaga creek alluvium et well <br />wSAL12, a value of 972 mg/1 was predicted, while a value of 690 mg/1 was <br />observed this year. <br />The June-September TDS value measured this year at well wHAL7-2 was 1350 mg/1, <br />while the predicted value wan 1299 mg/1. The 1350 mg/1 value was determined <br />gravimetrically (i.e., dry a water sample and weigh the residue). According to <br />8em (1989, pg. 157), "_, it ie not uncommon for water high is calcium sad sulfate <br />coacantratioae to yield a residue after drying as hour at 180°C that exceeds the <br />coa~uted dissolved eolida by several hundred milligrams par liters and also, "Ia • <br />many instances, aepac ially if the coaceatrntioa is greater thaw 1000 mg/1, the <br />calculated dissolved-eolida value may be preferable to the residue-oa- <br />evaporation value", The calculated dissolved eolida value ie determined by <br />adding uD all the conceatratione for all o£ the various dissolved constituents. <br />For June-9eDtembar 2000, the calculated TD9 value ie 1240 mg/1, which fall^ <br />below the PHC Dredietad value. <br />- wedge Overburden. Four walla monitor the wedge overburden. well WOV14 <br />exhibits n recently increasing TD9 trend. At well wOV16, the limited at so fnr <br />iadicntes an iacreaeiag TD3 tread. (Only eight samples have been collected so <br />far for well wOV16, ell of them after mining began, and until recently there was <br />normally not enough water to sample). well wOV17 exhibits ea increasing TDS <br />trend. wall wOV4-1 (II-w South Expansion area) was sampled for the first time <br />aver in May 2000. This year, this well was dry. <br />The Seneca II-w PHC predicts annual average TDS values at various wedge <br />overburden walla. For wall wOV14, a value of 4385 mg/1 was predicted, while a • <br />6 <br />