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1 <br /> Lab error resulted in the testing of total lead instead of soluble lead. Results ranging from 81 <br /> ppm to 120 ppm total lead were observed. All lead concentrations are comparable indicating <br /> tambient conditions Previous soluble threshold limit concentrations for lead were also low <br /> (Table 1), therefore, not considered to be an area of concern. Laboratory analysis results are <br /> ' summarized on Table 2. Laboratory data sheets and chain-of-custody documentation are <br /> presented in Appendix V. <br /> ' 4.2 Water <br /> Groundwater was encountered during drilling at 71.5 feet below grade. The well was completed <br /> ' to 86.5 feet below grade using 15 feet of 0.010 slot screen below and 5 feet of screen above the <br /> water level. The groundwater was monitored and sampled on January 17, 1991, and submitted <br /> ' to Applied Analytical to be analyzed for BTEX and TPHG. Laboratory analyses of the <br /> groundwater samples indicated detectable levels of ethylbenzene and TPHG at 0 9 and 56.0 parts <br /> per billion (ppb), respectively. Concentrations observed were only slightly above the Method <br /> Detection Limits (MDL) of the analyses Benzene, toluene, and xylenes were non-detectable <br /> Groundwater was resampled for confirmation purposes on January 24, 1991. Only 0.6 ppb <br /> xylenes and 63 ppb TPHG were detected in the sample. Again, the concentrations were only <br /> ' marginally above the MDL. A summary of groundwater laboratory results are presented in <br /> Table 3. Chain-of-custody and laboratory data sheets are contained in Appendix V. <br /> 5.0 CONCLUSIONS <br /> Significant concentrations of petroleum constituents are present immediately beneath the tank <br /> near the southeast end of the tank where the pump was located The lateral distribution of <br /> ' contamination appears to be minimal, however, vertical extent exceeds 26 feet below ground_ <br /> surface and has not been fully defined. <br /> 1 <br /> Groundwater has been slightly affected with low concentrations of dissolved petroleum <br /> ' hydrocarbon constituents. Constituents detected well below maximum contaminant levels for <br /> dnnlang water established in Title 22 of the California Administrative Code. <br /> WJSR 122 NK 6 <br />