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Contour lines were later extracted fran a large-scale topographic map • <br />of the Seneca II mine and added to the site map; they are oat precise <br />but do provide a general picture of topographic variability in the <br />project area. <br />A primary datum (Datum A) was established on a low eminence approximately <br />40-50 m south of the impact area. This locus was chosen because it <br />offered clear visibility of the project area and was sufficiently re- <br />moved from potential disturbance. This primary datum itself is refer- <br />enced to a pxaninent topographic landmark, lying 300 m at 67o frun the <br />primary datum, its elevation being 7360' (2243 m) above mean sea level. <br />Secondary mapping stations were utilized and referenced to the primary <br />datum. <br />Locations of specific points were obtained using a Brunton compass and <br />50-meter tape. The Brunton compass was affixed to a special holder on <br />a tripod, centered over the primary datum or mapping station point using <br />a plumb bob, and +he bearing to a specific ctti-~pning point in degrees off • <br />True North was ascertained. DetA*Tn;nation of bearing was acoonQlished <br />by two individuals: one person holding a "rod" over the mapning noint <br />while a second individual detP*~*f+; *+ed the bearing on the instrument and <br />remxded that measurement in afield notebcok. Distance to the mapping <br />point from a datum was subsequently obtained by two other individuals <br />using the metric tape. The locations of roads, the WC181 test pits and <br />test trenches, and the excavation units for this project were immediately <br />transferred to metric graph paper, and were field diecked for accuracy. <br />The bearing and distance to each of the features exposed during monitoring <br />operations were deterniined immediately upon exposure but their locations <br />were plotted onto the site map at a later date. <br />TEST <br />Locations. The sampling program for SILP139 stipulated that a ma:timum of <br />20 square meters was to be excavated. The specific manner in which this • <br />dirt was to be removed was left to the judgment of the field director <br />22 <br />