Laserfiche WebLink
• the regraded spoil surface. Where acid spoil (pH less than 5 and ABPless <br />than 5) is encountered at the regraded spoil surface, a selectively <br />handled suitable spoil topdressing or lime application will be required. <br />The elevated nitrate concentrations that occur in samples from the 1981 <br />cores (2034E, 2613E, 2614E) are apparently nonrepresentative. These cores <br />were very wet when sampled and were not dried before shipment to the <br />laboratory. Also, contamination from drilling additives may have occurred <br />during drilling. Therefore, the nitrate concentrations may be atypically <br />high due to sampling error. <br />No revegetation or ground water contamination problems are anticipated <br />from nitrate. The mean spoil nitrate value in the Wadge reclamation area <br />during 1986 and 1988 was 1.4 ppm (with a standard deviation of 0.9 ppin) <br />which is an order of magnitude below the ground water contamination level <br />of 60 ppm and actually approaches the plant deficiency level of 2 ppm. <br />Bath the premine ground water monitoring data (WA-0043 and WA-0044) and <br />the postmine spring (BP-0001) and pond data (DA-0004) indicate that N03-N <br />values are suitable (less than 10 mg/1) in the vicinity of Sites 2034E, <br />2613E, and 2614E (see Exhibit 7-2, Hydrology Monitoring Site Location <br />Map). Postmine spoil water quality will continue to be monitored for <br />N03-N at Sites BP-0001 and DA-0004. The data shall be presented in the <br />annual Hydrology Monitoring Report. <br /> <br />6-153a Revisea 08/17/90 <br />