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1 i 1 11 September 2001 AGE-NC Project No. 98-0466 1 Page 15 of 24 1 sample No. 1 was high enough(50,500 mg/kg)to classify the sample as iazardous under California regulations.Analysis of the five samples comprising Composite Sample o. 1 individually detected total lead concentrations of 28 mg/kg, 33 mg/kg, 313 mg/kg, 839 mg/kg and 17 mg/kg. 1 Soluble lead was detected at concentrations slightly exceeding the STLC of 5 mg/l in three composite samples - No. 1 at 7 mg/l, No. 3 at 5 mg/l and No. 6 at 9 mg/l. These results define the 1 soil as hazardous waste for disposal purposes. Resampling the points #tilized to make composite No. 1, the individual samples with total lead exceeding 50 mg/kg had soluble lead concentrations of 0.02 mg/l and less than 0.02 mg/l.These results would not lead to a hazardous waste classification 1 for essentially the same soil. The analytical results for the composite and discreet soil samples analyzed for CAM 17 metals, considering only analytes with concentrations of potential concern, are summarized on Table 4. Locations of discreet soil samples analyzed for lead are illustrated on 1 Figure 8. More characterization of lead in the soil is necessary to identify soil that may require treatment for soluble lead. 1 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 1 analyzed for volatile organic compounds, semi-volatile organic compounds, pesticides and chlorinated herbicides. No compounds in any of these classes were detected in the composite samples. 1 In addition to the above,the two composite samples were analyzed for total petroleum hydrocarbons as motor oil and diesel (TPH-mo and TPH-d, respectively), and for corrosivity, ignitability and 1 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 melted organic material visible 1 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.TPH-d, TPH-mo and pH results for the two composite samples are summarized on Table 4. 1 In June 2000, additional soil samples were collected from the various soil stockpiles to composite for analysis for dioxins. Dioxins are a combustion product of hydrocarbons in the presence of 1 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 preservativ,on the site. The most well- known of the dioxins and furans is the tetrachlorinated dioxin 2,3,7,8- CDD, considered the most 1 potent animal carcinogen and reproductive toxin evaluated to date by the EPA.In addition,there are 16 less toxic chlorinated dibenzodioxins (CCD) or chlorinated dibenzofurans (CDF). They are 1 referred to as 2,3,7,8-substituted congeners. When mixtures of dioxins and furans are present in a sample a Toxicity Equivalent (TEQ) is calculated to express the toxicity of the mixture. The TEQ is determined by multiplying the congener concentrations by its respective Toxicity Equivalency 1 Factor(TEF) and summing the TEF concentrations. Soil with TEQ concentrations below one part Advanced GeoEnvironmental,Inc. 1