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S E i99 I PcR R III IIIIIIIIIIIII III Doc Date:12/1112001 <br />t7C. na.wtn_ ~~S erE~w.~ 4 sss 11 <br />~SECI'IAN 4.0 ~iRegraded Spoil I~boratory Results ~` <br />a <br />Trapper's approved Mining and Reclamation Permit Application (C-81-01Q), specifies recontoured spoit wilt <br />be sampled annually for various chemical and physical properties to ensure suitability as a plant growth <br />medium. Section 2.7.2 addresses the parameters to be sampled, sampling intensity and suitability ranges for <br />those spoil parameters. TR-g8, approved in August, 1990, reduced the annual reporting requirements to <br />regraded Ashmore pit and problematic areas only. Trapper will sample and maintain all other spoil records <br />on site. Those records will be reality available to CMLRD. <br />4.1. Methods <br />Composite spoil samples (for all pits) were taken on approximatey 50-h to 100-h centers for each mapping <br />unit. The 1991 mapping units were determined by vesual and textural difference of the surface spoils. A soil <br />sampling density of approximately one sample per 5.9 acres of A pit reclaim area was accomplished. Each <br />sample was a wmposite from at least one foot of spoil material. The samples were anatyzed for pH, EC, <br />CaC03, O.M., N03-N, P, K, Zn, Fe, Mn, Cu, Se, Ca, Mg, Na, K, SAR, % Saturation, texture, Total Hg, F, <br />Total S, and the acid-base potential. If a large negative acid-base potential would have been found, then <br />additionai analyses including pyritic Sulfur and SOq-S would be run for that sample. No samples exhibited a <br />signitipnt negative acid-base potential. All 1991 spoil mapping units are presented on the annual spoil <br />history map (M4-]). Each unit is identified by the year sampled, texture, and lab analysis number. <br />4.2 Results <br />• All 1991 spoil laboratory anatyses were conducted by the Colorado State University Soil Testing laboratory. <br />Ashmore pit spoil analyses es provided in Table 4-1. Comparisons between the 1991 A pit laboratory resuits <br />and the approved suitability ranges (Permit Table 2.7-2a) indicate 1991 samples were all within allowable <br />suitability ranges. Table 4-2 shows the suitabtL'ty ratings for the ]991 Ashmore pit spoils. <br />4.3 Discussion and Recommendations <br />As previously stated, the purpose for annual spot? sampling and analysis is to demonstrate that the regraded <br />surface spoil layer has acceptable physical and chemical properties to promote plant growth and successful <br />reclamation. The 1991 data strongly indicates Trapper Mine has accomplished this goal. With the <br />replacement of suitable topsoil, all spoils should pros~de an excellent medium for plant growth for any <br />desirable postmine land use. <br />Collation of historical spoil analyses (1985-1989) fiat presented in Appendix W (1989) shows all 1991 <br />parameters are within the suitability ranges (Table 4.2 and 4.3). Table 4.3 also compares 1991 A pi[ spoil data <br />analysis to replaced topsoil values (1985-1990). <br />[a~ttho~vtttEpral <br /> <br />