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i <br /> EM c Pok of DIANE HINSON <br /> RAS <br />� <br /> Tcr.` Gordon Boggs <br /> 4 V, <br /> Date: March 6, 1992 <br /> Subject: 1700 S. ELDORADO STREET; STOCKTON i <br /> UST REMOVAL - HIGH LEAD LEVELS IN SOIL <br /> Attached are lab results from the recent tank removal; BTEX, TPH-G were all non- <br /> detectable for volatfles. The total lead concentration was 250 mg/kg. We asked that the <br /> WET be performed on the lead concentration and the results are: 1.5 mg/l. The sample . <br /> was taken under a floor of an apartment building where piping from the tanks terminated. <br /> The soil sample was collected 26 inches beneath the floor surface; 14 inches below the end <br /> points of the piping. <br /> I followed Jon Ma.rshack's document, 'Designated Level Methodology for Waste <br /> Classification and Cleanup Determination", October 1986 (updated June 1989), to evaluate <br /> whether this value was a potential threat to groundwater. If my assumptions are correct (my <br /> calculations are included), I believe this lead concentration is and may have been a threat <br /> to groundwater. Therefore, should we require a groundwater investigation based upon the <br /> potential threat of lead contamination, or refer the site to Regional Board for lead? If we <br /> should refer it, to whom should this site be sent? <br /> The City of Stockton currently owns the property and I believe it is going through property <br /> transfer. The prospective buyer is awaiting our direction. Please respond <br /> attachments (5) -. <br /> r <br /> i <br />