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California, provided on DTSCs Office of Human and Ecologic Risk website <br /> ' <br /> htti)s7//www.dtse.ca.goy/assessingrisk/humanrisk2.cftn, provides a background 95% Upper <br /> Confidence Limit(UCL) concentration of 400 µg/kg(Environ, 2002). <br /> ' Detected PAH concentrations were compared to EPA Regional Screening Levels(RSLs) for <br /> residential soil (EPA,2017)and the background study value of 400 mg/kg. Published PAH <br /> RSLs are provided on Table 2. All detected PAH concentrations were significantly below both <br /> the background value and the RSLs. <br /> ' 3.2 JUNE 2017 CONMMATION SAMPLING <br /> Additional soil was excavated in June 2017 in areas where the March 2017 confirmation samples <br /> ' exceeded the cleanup goal for lead. Confirmation bottom and sidewall samples were collected <br /> by Geocon on June 5, 2017. Confirmation samples were analyzed by McCampbell Analytical, <br /> ' Inc. for total lead by SW6020. <br /> Sample CONF4-B 1 exceeded the cleanup goal for lead. Additional soil was excavated at this <br /> ' location and additional confirmation samples were collected June 8, 2017. Approximate <br /> confirmation sample locations are depicted on Figure 2. <br /> ' The following table summarizes the samples that exceed cleanup goals in March and June 2017 <br /> (bold samples)and the corresponding confirmation samples collected in June 2017 after <br /> ' additional soil had been excavated from each area. <br /> MARCH 16,2017 JUNE 5,2017 ,TUNE 8,2017 <br /> -MFR-B-9 CONFS-B 1 <br /> CONF5-SW1 through SW4 <br /> ' MFR-B-11 CONF4-B1 CONF413-131 <br /> CONF4-SWI through SW4 CONF4B-SWI through SW4 <br /> ' <br /> MFR- )W-9lS 1-10 CONF1-B1 through B5 <br /> CONFI-SW 1 through S W 12 <br /> ' Analytical results for the June 2017 lead analyses are summarized on Table 1. Analytical reports <br /> and chain-of-custody documentation for the June 2017 confirmation samples are included in <br /> ' Appendix E. <br /> 1 <br /> Aft <br /> PACIRCEDGEENGINEERING 4 Closure Report_final.doe <br /> ' (949)470-1937;(949)470-0943(FW <br />