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T � • 07 May 2002 AGE-NC Project No. 98-0466 Page 8 of 16 Composite No. 2 = SP4-3 + SPS-1 + SP5-4 + SP6-3 + S 7-3 Composite No. 3 = SP9-1 + SP9-3 + SPI1-1 + SPI1-3 Composite No. 4 = SP8-1 + SP8-2 + SP10-1 + SP10-3 Composite No. 5 = SP12-1 + SP12-3 + SP15-1 + SP 15-2 Composite No. 6 = SP13-1 + SP 13-3 + SP14-1 + SP14- Composite No. 7 = SP16-1 + SP19-2 + SP19-4 Composite No. 8 = SP 17-2 + SP 18-2 + SP20-1 Total lead, barium and chromium concentrations in various composite les were high enough to trigger analysis of the samples for the soluble forms of the metals; only total lead in composite sample No. 1 was high enough(50,500 mg/kg) to classify the sample as hazardous under California regulations. Analysis of the five samples comprising Composite Sample No. 1 individually detected total lead concentrations of 28 mg/kg, 33 mg/kg, 313 mg/kg, 839 mg/kg and 17 mg/kg. Soluble lead was detected at concentrations slightly exceeding the STLC of 5 mg/1 in three composite samples -No. 1 at 7 mg/1, No. 3 at 5 mg/1 and No. 6 at 9 . These results define the soil as hazardous waste for disposal purposes. Resampling the points u ilized to make composite No. 1, the individual samples with total lead exceeding 50 mg/kg had soluble lead concentrations of 0.02 mg/1 and less than 0.02 mg/l. These results would not lead to a hazardous waste classification for essentially the same soil. Locations of discreet soil samples analyzed for lead are illustrated on Figure 7. More characterization of lead in the soil is necessary to identify soil that may require treatment for soluble lead. Composite Sample No. 1,by virtue of its elevated lead and other metals (and notable organic debris content in the stockpiles), and Composite Sample No. 5, believed to contain ash material, were analyzed for volatile organic compounds, semi-volatile organic co>1npounds, pesticides and chlorinated herbicides. No compounds in any of these classes were detected in the composite samples. In addition to the above,the two composite samples were analyzed for totz I petroleum hydrocarbons as motor oil and diesel (TPH-mo and TPH-d, respectively), and for c rrosivity, ignitability and reactivity. Neither composite sample exhibited ignitability or reactivity with sulfides, cyanide or water. The TPH-mo concentrations reported are not excessively high but individual samples should be analyzed to verify these concentrations as representative. There is melt d organic material visible in the piles, which may be a source for the motor oil range hydrocarbons detected in the soil. The samples do not have corrosive characteristics that would classify the material as hazardous. In June 2000, additional soil samples were collected from the various sol stockpiles to composite for analysis for dioxins. Dioxins are a combustion product of hydrocarbons in the presence of chlorine or that contain chlorine, such as PVC,pentacholophenol(PCP) and trichlorophenol(TCP), both of the latter two known to have been utilized as a wood preservative on the site. The most well- Advanced GeoEnvironmental,Inc.