GENERAL33151 - Laserfiche WebLink

Home Browse Search

• METHODS Selection of Study Sites Reclamation activities at the Seneca II Mine have been ongoing since the early 70's. This has resulted in a variety of methods used in reclamation which can be associated with changes in regulatory requirements, methodologies, and technology. Three general types of reclamation were subsequently sampled at the Seneca II Mine and are listed below: graded spoils, no topsoil; graded spoils, topsoil from stockpiles; graded spoils, direct hauled topsoil. Prior to selection of sample sites, area coverage of the three types to be studied was delineated on a I"=400'topographic base map. The areas selected were based on annual reclamation reports for the Seneca II Mine and were further verified through consulta- tions with the Reclamation Supervisor at the mine and the use of current aerial photo- graphy. The areal extent of the three types studied was determined through the use of a polar planimeter. Sampling Design All sample sites were selected by a random process in which a 200 x 200 foot grid system was overlain on the I"=400' topographic base map and a random number table used to assign spatial (x, y) coordinates. Sample size was based on previous vegetation studies conducted by Western Resource Development Corporation of Boulder, Colorado and Guideline No. 2 (Vegetation) of the Wyoming Department of Environmental duality (DES). Sample sizes were as follows: Graded spoils/no topsoil 30 Graded spoils/direct haul topsoil 50 Graded spoils/topsoil from stockpiles 7 Sample sites were located in the field during August and September, 1982 using a I"=400' topographic map with a 10 foot contour interval. Time of Sampling Sampling occurred during two different time periods. Approximately half of all sites were sampled during the period of 3/4 August 1982. The remaining sites were sampled during the period of 23/24 September 1982. -3-