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07 February 1997 <br /> AGE-NC Project No 96-0266 <br /> Page 5 of 8 <br /> Figure 3 - Dissolved Hydrocarbons in Ground Water <br /> Laboratory results of grab ground water samples analyzed for petroleum hydrocarbons are <br /> t summarized in Table 2 The laboratory reports (MAI Laboratory ID 71282 to 71296, 72947 to <br /> 72963), QA/QC reports and chains-of-custody are included in Appendix B <br /> 1 44 METALS-IMPACTED SOIL r <br /> ' A total of nine soil samples collected from the plating shop area were analyzed for LUFT metals <br /> (cadmium, chromium, lead, nickel and zinc) Additionally, one sample each from probe borings P2 <br /> and P5 were analyzed for LUFT metals to provide"background' information The concentrations <br /> ' of background levels represent the naturally occurring concentrations of any analytes, or the level <br /> which is observed prior to any release or impacted to the enviromnent The metals detected in near <br /> ' the plating shop are similar to concentrations detected in the "background" samples <br /> The two shallow soil samples collected from the plating area (I-1 and I-2) were also analyzed for <br /> silver and cyanide <br /> Chromium, lead, nickel and zinc were detected in all samples analyzed With the exception of <br /> ' sample 1-1, concentrations of metals detected in near the plating shop are similar to concentrations <br /> detected in the "background' samples <br /> The soluble threshold limit concentration(STLC)of lead is 5 mg/I(milligrams per liter or parts per <br /> million ppm) and detected concentrations greater than ten times the STLC would warrant the <br /> analysis of soluble lead Total lead was detected in sample I-1 at 110 ppm However, after a <br /> ' subsequent analysis, the soluble lead was concentration detected was found to be 2 5 ppm in this <br /> sample <br /> ' Analytical results of soil samples analyzed for metals are depicted on Table 3 The laboratory report <br /> (MAI Laboratory ID 72947 to 72963 and 71599 to 7160), QA/QC report and chain-of-custody are <br /> ' included in Appendices B and C <br /> ' 45 METALS-IMPACTED GROUND WATER <br /> The two grab ground water samples were found to contain LUFT metals, cadmium concentrations <br /> range from 0 008 to 0 012 ppm,lead from 0 54 to 1 3 ppm and zinc form 3 5 to 7 2 ppm Chromium <br /> and zinc were detected at 15 ppm in both samples <br /> 1 <br />