Laserfiche WebLink
irrigation ditch water is only about 200 mg/l and pH of 8.3, (see Table 2.04.7-6, SW -N209). <br />Runoff water is 2 to 3 times higher in TDS and in streams the TDS is 5 to 6 times higher, (see <br />Table 2.04.7-7, SW -N202). The better quality water infiltrating the backfill picks up dissolved <br />solids as in the case of the overburden; however, it simply does so much more rapidly. Water <br />infiltrating into the spoil at the upper end of the New Horizon #1 spoil may only spend 15-45 <br />days in the spoil before the water is discharged at the spring. Yet, during this short time, it has <br />managed to become approximately the same quality as the overburden water. Due to the <br />increased porosity and higher level of oxygen in the rapidly infiltrating water, the pyrite breaks <br />down at a faster rate but this reaction is buffered by both the higher pH of the water and the alcite <br />in the replaced overburden. Therefore, the overall impacts to groundwater water quality are the <br />following: <br />Section 2.05.6(3) Page 23 Sept. 2015 (TR -11) <br />