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Show • MAGNA RAILROAD SLOPE (MOl) CHARACTERIZATION REPORT INTRODUCTION The Magna Railroad Slope Site is defined by a discolored slope which is comprised of slag, tailings, iron-stained gravel, and waste debris. In February and March 1995, eleven soil samples were collected from the site and analyzed at Datachem Laboratory for arsenic, cadmium, lead and selenium concentrations. One sample was split and analyzed at Kennecott Environmental Laboratory (KEL). Six of the samples were found to contain elevated lead and(or) arsenic concentrations. In July and August 1995 and January 1996, four additional samples were collected and analyzed at Chemtech Laboratory for total arsenic, cadmium, lead, and selenium concentrations. Two of these samples contained lead concentrations above the action level. LOCATION AND DESCRIPTION • The Magna Railroad Slope Site is located approximately 500 feet southwest of Bravo Gate between the entry road to the Arthur area (north) and the Ore Haulage Railroad tracks (south) (Dwg. No. 507-T-0135). The site is defined by a discolored slope which is comprised of slag, tailings, iron-stained gravel, and waste debris. The site is 1450 feet long by 100 to 150 feet wide and is situated on a moderately steep slope. The western 300 feet of the slope consists of moderately iron-stained, sandy gravel coated with copper precipitate. Minor slag is also present. The middle 700 feet of the slope is predominately slag at the surface with increasing amounts of sand at depth. The eastern 550 feet of the slope appears to have been a dump containing a variety of debris such as slag, wood, and metal mixed with soil. The pile is estimated to contain 21250 cubic yards of material. Nine thousand cubic yards contain elevated concentrations of lead and(or) arsenic. Three different types of materials were observed and sampled at the site. The three types will be referred to as the main pile, the west end soils, and the east end debris piles. The following paragraphs describe each of these material types. MAIN PILE: The main pile represents the majority of the material at the site. It is located in the middle 700 feet of the slope and consists of slag and tailings. Samples MG95Z0001 and MG95Z0002 were collected from this material. • WEST END SOILS: The west end soils comprise the western 300 feet of the slope. These soils do not appear to be native to this location. Large cobbles and boulders coated with copper precipitate are abundant at the surface. The soils consist of a moderately iron stained, sandy gravel and contain approximately 5% slag. These soils are in sharp contact with a lower gravelly silt unit which may be the natural ground. Samples MG95Z0003, MG95Z0008, MG95Z0036, and MG95Z0037 were collected from this MOlcrpt.wpd* July 22, 1996 Rev. 0 |
