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0 41 <br />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 />