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Show • • - - MAGNA EAST DEBRIS SITE M09 POST REMOVAL AND POST RECLAMATION SAMPLING REPORT INTRODUCTION The Magna East Debris Site is located on Kennecott Utah Copper Corporation (Kennecott) property along the east side of the road that connects the Magna and Bonneville areas and 100 feet east of the Magna Pump Station. The Site consists of two piles of material that have been dumped off the side of a steep, east facing slope. Between April and August 1995, 18 soil samples were collected to characterize the Site. The sampling and analysis indicated that an area of approximately 30 feet by 350 feet contained elevated concentrations of arsenic and(or) lead. In December 1995, 3200 cubic yards of contaminated soil were removed. After removal, two samples were collected from the footprint of the removal area, and were analyzed for total arsenic, cadmium, selenium, and lead. The results of the analysis indicated low concentrations of all analytes and the Site was subsequently regraded and 10,800 cubic yards of topsoil were placed over the regraded atea. In March 1996, 6 post reclamation samples were collected from the Site to document the metals content of the post reclamation surface. The samples were analyzed for total arsenic, cadmium, lead, and selenium concentrations. None of the samples contained elevated concentrations of any of the analytes. This report documents the post removal and post reclamation sampling activities . LOCATION AND DESCRIPTION The ~agna East Debris Site is located on Kennecott property along the east side of the road that connects the Magna and Bonneville areas and 100 feet east of the Magna Pump Station (Dwg. No. 507-T-0169). The Site consists of two piles of material that have been dumped off the side of a steep east facing slope. The piles will be referred to as piles A and B for the purpose of this report. Pile A is located 100 feet east of the Magna Pump Station, and Pile B is located 150 feet southeast of the Magna Pump Station. Both piles consist of medium brown, gravelly sand mixed with approximately 20% debris, including pebble-sized slag fragments, metal, wood, and cement. Erosional rills have formed along the east side of the piles, and eroded material has been deposited at the base of the slope. The tops of the piles are flat. Pile A is approximately 60 feet wide, 90 feet long, and 45 feet high, and Pile B·is approximately 120 feet wide, 530 feet long, - - -an - d 20 tol 50 feet high~ - - ·- - -- - -· -- - • The southern two thirds of Pile B was found to contain elevated concentrations of lead and(or) arsenic. This portion of the pile was removed and hauled to Wastewater Treatment Plant (WWfP) Pond C for temporary sto!age. Approximately 3200 cubic yards of soil were rem~ved, leaving a north-south cut 20 feet wide and 15 feet tall by 350 feet long. The entire Site was then regraded and 10,800 cubic yards of topsoil from a local borrow source was spread over the regraded area. M09post.wpd'!' June 24, 1997 Rev.O |
