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l ` a <br /> AWiu� <br /> Working To Restore Nature <br /> certified Sequoia Analytical Laboratory in Redwood City, California. Samples were analyzed <br /> for benzene, toluene, ethylbenzene, and xylenes (BTEX) and total petroleum hydrocarbons as <br /> -diesel (TPHd). Sample "S-1" was also analyzed for soluble TPHg, TPHd and BTEX by the <br /> STLC procedure. <br /> In addition, six composite soil samples were collected on December 14, 1993 from the <br /> ;overburden removed from the excavation. Soil samples collected from the stockpiled soil were <br /> analyzed for BTEX, TPHd, volatile organics, bioassay toxicity, CAM 17 metals, corrosivity and <br /> reactivity. All samples were analyzed by Sequoia Analytical utilizing appropriate EPA <br /> methodologies. <br /> { <br /> TPHd was found to be present in low to moderate concentrations in all but one of the samples <br /> collected from beneath the vaults and sump. The highest recorded concentration of TPHd (600 <br /> i parts per million) was detected at the eastern end of the sump in sample "S-1". The leachable <br /> concentration of TPHd in this sample was quite low, 1.3 ppm, in the STLC extract. The only <br /> aromatic constituent detected in any sample was 0.16 ppm xylenes in the sample collected from <br /> the western end of the sump. <br /> Petroleum hydrocarbon constituents (TPHd) were detected in each of the composite soil samples <br /> collected from the excavated soils. No volatile organics were detected. The soil was not found <br /> to bear the characteristics of hazardous waste according to the toxicity, reactivity, corrosivity <br /> or metals analyses. The stockpiled soil was transported to R&J Soil Recyclers/American River <br /> Asphalt for recycling. Non-hazardous construction debris was disposed of at Forward Landfill. a� <br /> P Y g P <br /> Analytical data is summarized in Table 1 of the report. Laboratory data sheets and chain of <br /> custody documentation are included as Attachment 1 to the report. The Hazardous Waste <br /> (Rinsate) Manifests and the soil receipt record associated with vault exposure and <br /> decontamination are included as Attachment 2 of the report. <br /> If you have any questions or comments, please contact me at (209) 838-3507. <br /> Respectfully, <br /> RESNA Industries Inc. <br /> Gregory P. Stahl <br /> CA Registered Geologist No. 5023 <br /> GPS/ggk <br /> Enclosure: Soil Sampling Report <br /> 78001MREPORTSUPR-0794 1 <br />