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found that specific constituent levels exceed hazardous levels specified in 22 CCR, e.g. STLC <br /> for Lead is much greater than 5 mg/I. Based on information known about the site the following <br /> is expected: <br /> a) The 60-acre Riverbank Dump (extents of former gravel mining operations) has 5 <br /> separate parcels with varying degrees of cover, grading and drainage. Some <br /> parcels have cover(developed parcels)and are graded and others have nominal <br /> cover(< 1 foot) and poor grading. <br /> b) Several parcels are not graded or have been effected by differential settlement <br /> C) Investigation trenches and spoils exist on several parcels <br /> d) Some of the parcels have illegally disposed of waste adjacent to the railroad <br /> embankment (Lane & Lynch properties) <br /> e) Waste constituents may contain residual concentrations of heavy metals frorh the <br /> burning of solid waste. Metals detected most likely include lead, copper, nickel, <br /> zinc and chrome. Iron and aluminum also may be present. <br /> f) Although the site was closed in the 1960s, landfill gas may be present in <br /> concentrations exceeding regulatory thresholds (5%). <br /> g) USGS Topographic lines show that the difference in elevation between Sante Fe <br /> Road (110 ft) and the bottom of the gravel pit(95 ft)was approximately 15 ft. <br /> h) Cover material may be approximately unknown in thickness <br /> i) Reconfigured waste limits approximate those shown in TBD. <br /> CIWMB 14 <br />