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01 May 2002 ----- <br /> AGE-NC Project No. 01-0875 <br /> Page 5 of 6 <br /> 5.3. ANALYTICAL RESULTS OF BORING SOIL AND GROUND WATER SAMPLES <br /> None of the target analytes were detected in the soil and ground water samples analyzed.Analytical <br /> results of soil and groundwater samples are summarized in Table 1. The laboratory report (CTEL <br /> Sample ID 0203-041-1 through 0203-041-4), chain of custody form, and QA/QC documents, are <br /> included in Appendix A. <br /> 5.4. STOCKPILE SAMPLING RESULTS <br /> Cr was detected at a concentration of 64 mg/kg, Cu was detected at a concentration of 45 mg/kg,Ni <br /> was detected at a concentration of 56 mg/kg and Zn was detected at a concentration of 91 mg/kg;Pb <br /> was not detected at or above the detection limit of 5 mg/kg. <br /> PCBs were not detected in the soil samples analyzed. <br /> Analytical results of stockpiled soil samples are summarized in Table 2. The laboratory report <br /> (CTEL Sample ID 0203-121-1), chain of custody form, and QA/QC documents, are included in <br /> Appendix A. <br /> 6.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following: <br /> • An apparently small zone(approximately 3-foot by 5-foot in width)of impacted soil was left <br /> in place within the excavation; the vertical and lateral extent of the contamination did not <br /> extend to soil boring P-1, located down-gradient and within 3 feet of the impacted zone. <br /> • The upper 20 feet of soil consisted of brown to yellow brown lean clays and clayey silts; <br /> these soils generally have low porosities and tend to impede migration of petroleum <br /> hydrocarbons. <br /> • Ground water was encountered at a depth between 21 and 27 feet; ground water was not <br /> impacted by petroleum hydrocarbon products. <br /> • Four of the five luft metals were detected in stockpiled soil samples analyzed;however,the <br /> detected quantities are within the range of concentrations for these elements in California <br /> soils, as determined by the 1996 report of the Kearney Foundation of Soil Science titled <br /> Background Concentrations of Trace and Major Elements in California Soils. <br /> Advanced GeoEnvironmental,Inc. <br />