Laserfiche WebLink
separate section, Comparison of Ground Water Quality to Water Use <br />Standards, will list those samples that exceed water use standards. <br />Data for each well in Appendix D begins with a listing of the water <br />quality data collected during the past two years, followed by remarks <br />explaining the sampling procedure. This is followed by a plot of TDS <br />versus time for the entire period of record. The regression line on this <br />plot is generated by a method known as LOWESS (Locally Weighted Scatter <br />plot Smoothing). A smoothness factor of 1 (on a scale of 0 to 1) was <br />used, which gives maximum smoothing. This plot is followed by a table <br />listing historic TDS values and percent milliequivalents for major ions. <br />Finally, a statistical report representing baseline (i.e., premining) <br />data for each well (when available) is presented in Appendix D1. On this <br />statistics report, "censored data" refers to analytical values that were <br />below the detection limit, which were censored from the min/max/mean <br />calculations. The time frame for baseline conditions is listed under <br />"conditions specified" at the bottom of each page. <br /> <br />- Alluvium. Three wells monitor the Hubberson Gulch alluvium. Well <br />WHAL6-2 is upstream of NPDES 006, but downstream of NPDES 016 and 017, <br />which began discharging in 2001 and 2003. Its TDS plot shows a slightly <br />increasing trend. This may be due to the fact that this pasture has been <br />irrigated starting in 1989. Well WHAL7-2 exists on Hubberson Gulch <br />downstream of mine discharges from NPDES 006, 016 and 017. Its TDS plot <br />shows an increasing trend. Well WHAL10 exists on 006 Gulch (a Hubberson <br />Gulch tributary) below NPDES 006. TDS values at this well display an <br />increasing trend. <br />One well monitors the 005 Gulch alluvium (tributary to Dry Creek). This <br />well, WDAL11, is normally dry. <br />Three wells monitor the Sage Creek alluvium. Well WSAL12, located on <br />Sage Creek adjacent to Surface Water Site SW-S2-FG4 (WSSF3), is <br />downstream of all mine discharges on Sage Creek . TDS values at this well <br />had been increasing since it was drilled in 19 90, but have leveled off <br />since 1996. Well WSAL13 is located below NPDES 009 on the n orthern Sage <br />6 <br />