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1 WESTERN GEOLOGIC RESOURCES , INC <br /> E Rat]iff/28 November 1989 <br /> 2 <br /> The analytic results are presented in Table 1 and the chain-of-custody <br /> forms and laboratory reports are Included in Attachment C Fuels <br /> characterized as diesel or gasoline were not detected in four of the <br /> composite soil samples and were detected at concentrations ranging <br /> J from 4 ppm to 23 parts per million (ppm) in the other five soil <br /> `- samples Fuels were not detected In the two samples from the pea <br /> gravel stockpile <br /> 2 November 1989 WGR collected 16 samples from the soil stockpile and four samples <br /> from the pea grave] stockpile (Figure 4) The soil samples were <br /> composited to four samples and the pea gravel samples were <br /> 1 composited to one sample The composites were analyzed for CAM <br /> ^a- <br /> metals and were tested in a toxicity bioassay program by CCAS <br /> The analytic results indicate that the 4 compos�tc soli ,✓ (iples and 1 <br /> _ composite pea gravel sample contained only very low concentrations <br /> of each of the metals of concern and were well below the total <br /> threshold limit concentration (TTLC) for each metal The chain-of- <br /> custody forms and laboratory reports are contained in Attachment C <br /> The results of the toxicity bioassays for acute aquatic 96-hr LC50 run <br /> on the composite samples indicate that the soil and pea gravel are not <br /> hazardous or toxic by that criterion Laboratory reports are included <br /> in Attachment C <br /> RECOMMENDATION FOR DISPOSAL OF SOIL AND PEA GRAVEL STOCKPILES <br /> The results of past investigations and stockpile sampling and the recent two rounds of stockpile <br /> sampling indicate that the material qualifies for disposal at a Class III facility Fuel hydrocarbons <br /> originally present in the stockpile soils have been successfully aerated to concentrations well below 100 <br /> Ppm Aromatic hydrocarbons have never been detected in stockpile samples or samples collected during <br /> the driIluig of soil borings (Attachment A) Only very.ow concentrations of CAM metal were detected <br /> in the soil and the toxicity bioassay indicates that the material is not hazardous or toxic <br /> 076L2NO9 <br />