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1 0 0 <br /> ' and 3)total and TCLP lead concentrations (Geocon 2015). The following findings were <br /> reported: <br /> ' 1. A correlation exists between XRF and total lead results up to 2,000 mg/kg and XRF <br /> readings above 2,000 mg/kg tended to underestimate total lead concentrations. <br /> ' 2. Lead in surface soil is highly soluble(by the WET and TCLP methods) and total lead <br /> concentrations greater than 50 mg/kg are expected to exceed the STLC of 5 mg/l and <br /> ' total lead concentrations greater than 135 mg/kg are expected to exceed the TCLP of 5 <br /> mg/l. <br /> A lead concentration of 80 mg/kg is the proposed cleanup level as discussed in Section 4.0 <br /> ' Cleanup Goals. Lead concentrations exceed the proposed cleanup level in the upper foot of the <br /> firing range floor and up to three feet in the impact berm(XRF readings and metal detection <br /> ' findings indicate that bullets penetrated the berm to a depth of 2.5 to 3 feet). The following <br /> volumes of soil exceeding California and RCRA hazardous waste criteria were estimated <br /> (Geocon 2015): <br /> 1. 490 yds3 (780 tons) of California hazardous waste <br /> 2. 660 yds3 (1,050)tons of RCRA hazardous waste <br /> 1 <br /> 1 <br /> t <br /> 1 <br /> 1 <br /> PACIFIc EDGE ENGINEEMG 5 SREW_Manteca_draft.docx <br /> (949)470-1937;(949)470-0943(FAX) <br />