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1 <br /> 2 contaminated soils have been excavated and disposed at a Class I <br /> 3 landfill . As the building and neighboring property is locked, <br /> 4 access to the site is controlled. The site is bound by the <br /> 5 Stockton Turning Basin to the south and commercial establish- <br /> 6 ments to the west and east. A residential neighborhood is di- <br /> 7 rectly to the north of the site across Field Ave. The nearest <br /> 8 well in use is at a distance of one mile from the site. It is a <br /> 9 domestic well. It is screened at a depth of four hundred feet <br /> 10 below the ground surface. Topography between the site and the <br /> 11 well is level. The aquifer this well draws from is lower than <br /> 12 the shallow groundwater contaminated by the site. In addition, <br /> 13 the shallow clay soil layers underlying the site inhibit ver- <br /> 14 tical migration of contaminants. Only one narrow strip of con- <br /> taminated soil remains at the site under the exterior wall foot- <br /> 15 <br /> 16 ing. This soil could not be removed without undermining the <br /> 17 building. <br /> 2 .5 HEALTH RISKS OF SUBSTANCES FOUND <br /> 18 <br /> 19 2. 5. 1 Lead is a heavy metal that acts as a systemic poison by <br /> 20 accumulating in human body tissues. Acute effects of lead ex- <br /> 21 posure include fatigue, headache, aching muscles and bones, <br /> 22 sleep disturbance, abdominal pain, and decreased appetite. <br /> 23 Chronic effects include fetotoxicity, anemic pallor, central <br /> 24 nervous system effects, kidney damage, and peripheral neuro- <br /> 25 pathy. The LD50 (Lethal Dose that will cause death in 50% of a <br /> 26 known population which are usually laboratory rats) is 160-1000 <br /> 27 milligrams substance per kilogram body weight (mg/kg) . <br /> 2.5.2 Copper can be a skin and eye irritant at higher doses. <br /> COURT PAPER <br /> STAIR aruuIOWA —5— <br /> STC. 113 1 .'v a Tal <br /> 85 34]69 <br />