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t i <br /> 4633 Soil Characterization Report <br /> Proposed Parking Structure <br /> � 'May 27,2005 f. Page 4 <br /> Table 3—Discrete Lead Anal tical Results <br /> ead(TTLC)ST <br /> Lead <br /> r Analytical Method: `-6010B 601013 <br /> Reporting Limit: 1.0 m; <br /> fig 0:25 mg/L <br /> Sample ID Date <br /> 4633-1-4 5/9/05 7.7 NA <br /> ' 4633-2-4 5/9/05 26 NA <br />" 4633-3-4 5/9/05 34 NA <br /> 4633-4-4 5/9/05 9.7 I NA <br /> 4633-94 5/10/05 16 _ NA <br /> 4633-10-4 <br /> 5/10/05 X320 15 <br />} 4633-11-4 5/10/05 11 NA <br /> 4633-12-4 5/10/OS _ 10 NA <br /> mg/kg:milligrams per kilogram=parts per million <br /> µg/L:micrograms per liter <br /> {{{ , TTLC:Total Threshold Limit Concentration , <br />{ STLC:Soluble Threshold Limit Concentration <br /> i <br /> 5.0 CONCLUSIONS <br /> Based on the laboratory analytical results, no petroleum hydrocarbons,VOCs, or asbestos were detected- <br /> in the soil samples collected from the Site. Concentrations of PCB',s and OCPs, where detected, were well <br /> below Title 22 levels. Concentrations of metals were consistent with regional background concentrations <br /> (based on data gathered from other projects in the same vicinity), with the exception of lead. Lead <br /> F' deposits from a fire other concentrating procedures on the former Site are likely the cause of the elevated <br /> lead concentration in sample 4633-10-4. Condor considers the ,initial analytical result for composite <br /> sample 4633-(1, 2, 3, 4) of 220 mg/kg lead. to be invalid, anomalous, and irreproducible based on the <br /> subsequent discrete and second composite results for lead. <br /> 6.0 RECOMMENDATIONS <br /> Condor recommends an additional in situcharacterization <br /> s t or ex situ soil to be performed around <br /> sample 4633-10-4 to further define the volume of the lead concentration in the sample area. <br /> Based on the laboratory analytical results,the remainder of the excavated soil from the Site should <br /> be acceptable for use as clean fill soil off Site. However,the analytical results should be provided to <br /> anyone who receives this soil. <br /> �1� CONDOR <br />