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0kn KLEINFELDER <br /> 4.3 SURFACE WATER <br /> 4.3.1 LOCATION OF SURFACE WATER <br /> The Mokelumne River borders the north and east sides of the landfill (Plate 2). With the <br /> exception of industrial waste ponds, no other surface water bodies appear to exist in the <br /> vicinity of the site. <br /> Based on visual observations and estimations, the surface of water in the river was <br /> approximately 20 feet below the ground elevation of MW-1 during September 1988. <br /> 4.3.2 ANALYTICAL RESULTS <br /> Two samples were collected from the Mokelumne River, which flows along the north and <br /> west sides of the landfill. One sample, #16252, was collected downstream of the landfill <br /> near the railroad bridge. The other sample, 16283,was collected upstream at the eastern <br /> edge of the landfill. <br /> Neither of the surface water samples contained detectable concentrations of aromatic or <br /> halogenated volatile organic compounds. Of the 25 metals quantified in the analysis, both <br /> samples contained four metals: calcium (9.4 mg/1), iron (.2 to .3 mg/1), manganese (.12 to <br /> .13 mg/1), and sodium (5.5 mg/1). A low concentration of a fifth metal, aluminum (.3 <br /> mg/1), was detected in the upstream sample. No other metals were detected in the two <br /> surface water samples. <br /> The surface water appears to be a calcium/bicarbonate type and does not change <br /> noticeably from upstream to downstream. The Stiff diagrams for these two samples are <br /> shown in Plate 9. The two surface water samples contained low concentrations of total <br /> dimplygd solids '73�k l and ide 5.1 to 5 3 m <br /> The surface water appears to differ significantly from the ground water in MW-1. <br /> However, the landfill does not appear to be affecting surface water quality because <br /> upstream and downstream samples do not differ noticeably. Iron concentrations in the <br /> 137-88-1663 17 <br />