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Show • SOIL SAMPLING AND ANALYSIS PLAN ADDENDUM All ARTHUR STILLS SITE (All) LOCATION AND DESCRIPTION The Arthur Stills Site is located on Kennecott Utah Copper Corporation (Kennecott) property approximately 800 feet south of the Arthur Central Shops (Dwg. No. 507-T-0173). The site covers an area of approximately 6.5 acres (400 feet x 700 feet) and is located on moderately steep, broken topography comprised of lacustrine beach deposits overlying bedrock at shallow depths. The Arthur Stills Site was used to produce RECO, a chemical used in the flotation process. The site was demolished in 1993. Before demolition, the site contained nine above ground storage tanks, stills, support buildings, and a 1,000,000 gallon reservoir. Chemicals stored at the site included the following: burner oil, cresylic acid, methyl alcohol, sodium hydroxide, RECO, and #2 burner oil. Approximately one third of the site has been recontoured. The remaining area showed signs of impacted (stained or discolored) soils and the odor of RECO can be detected on the west side of the reservoir. Slag and bricks are visible locally. • PREVIOUS WORK Two samples of bank material from the reservoir were collected by Kennecott personnel in 1992. Sample AR-S-0009-A was collected below an old water level mark and Sample AR-S0009-X was a six-point composite sample of the bank material above the water level mark. Both samples were analyzed for total metals (arsenic, silver, barium, cadmium, chromium, mercury, lead, selenium~ and copper) and one sample contained elevated arsenic (563 parts per million (ppm)). PROPOSED SAMPLING • Prior to reclamation it will be necessary to collect additional samples from the Stills Site. One composite sample will be collected from all the nine former tank locations and analyzed for total metals (3050/6010 for arsenic, cadmium, lead, and selenium). One composite sample will be collected at the reservoir from the Oto 6 inches below surface interval. If conditions permit, a pit will be excavated through the bottom of the reservoir with a backhoe in order to collect samples at depth. Three foot vertical channel samples will be collected to the depth limit of the backhoe or until unimpacted soil is encountered. The reservoir samples will be analyzed for total metals (3050/6010 for arsenic, cadmium, lead, and selenium). Any area at the site observed to be discolored or otherwise appears impacted will be sampled for total metals. Numerous holes will be hand dug to examine the underlying soils and any suspicious soils observed will be sampled A 12adde.doc*- July I, 1996 Rev. 0 |
