Laserfiche WebLink
Final graded areas will be sampled with a hydraulic soil sampler, backhce, bucket auger, or other suitable <br />equipment. One representative sample from a vertical inuement of 0.0 to 3.0 feet will be collected by or • <br />under the supervision of a soil scientist from a 60 degree slant grid system with 500 foot centers. The soil <br />scientist will also inspect the surface between grid points. If a significant change in root growth medium <br />characterisfics is observed between grid points, additional sample points will be located. Regraded spoil will <br />also be visually inspected for compaction, possible root growth problems, and the potential for slippage at the <br />topsoil/spoil interface. <br />Shallow postmine soil pits will be excavated near revegetation monitoring sites to evaluate plant rooting <br />characteristics and compare topsoil/spoil data with site-specific revegetation data. Sample sites will typically <br />be placed in three-year-old revegetation areas at a frequency of about 1 site per 25 awes. Pits will be <br />excavated and topsoil and spoil will be sampled to a minimum depth of four feet. <br />At a minimum, final graded spoil samples will be analyzed for the following parameters to determine <br />suitability: pH, particle size, acid base potential, and saturation percent. The parameter list is based upon the <br />baseline information acquired during the premine overburden (Tab 6) and soil survey (Tab 9) sampling <br />programs. <br />The parameter list will be more ctosely evaluated once sufficient samples are collected to determine the • <br />degree of sample variability. This approach will help to eliminate unnecessary and unwartantable analyses <br />cost and data duplication. This parameter list represents those characteristics of the Seneca II-W topsoil and <br />overburden which may hinder plant growth on regraded spoil. Laboratory procedures and suitability uiteda <br />will be identical to those described in Tab 6, Tables 6-2 and 6-13, and Tab 9, Tables 9-1 and 9-2. <br />Unsuitable Sooil Mitigation Plan. If one or more parameters fall within the unsuitable range at a given grid <br />point, afour-part mitigation plan will be implemented. <br />1. The area around a suspect hole will be sampled on a closer spacing interval in order to better define <br />the lateral extent and variability of the unsuitable material. <br />L I <br />TR-50 4 Revised 07/05 <br />