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Records Center UST Closure In-Place and Sail Sampling Report April 20,2012 Page-5- 10.0 CONCLUSIONS AND RECOMMENDATIONS Laboratory analytical results of soil samples collected from below the UST at depths of approximately two feet and four feet below the bottom of the tank indicate that the soil in the immediate vicinity of the former UST location has not been i pacted by petroleum hydrocarbons. Laboratory analytical results of soil samples collected from below i rie UST indicated that detected concentrations of lead and PCB-1254 were above the California Human lealth Screening Levels CHHSLs for residential use and below the CHHSLs for Commercial use. Con entrations of the other metals and PCB cogeners, and for the same analytes in other samples either di I not exceed the CHSSLs or laboratory reported detection limits. A pattern of distribution related to the lead and PCB-1254 concentrations could not be determined from the laboratory data which indicates th t those concentrations that exceed the CHSSLs were outlier data. Condor does not recommend additional investigation or analysis to evaluate the detected metals or PCB- 1254. Condor recommends that the UST that was closed in place be considered for site closure. The gasoline-impacted soil previously investigated in deeper soil on the site does not appear to have originated from the UST closed in-place, and likely originates from off-site. 11.0 LIMITATIONS Condor developed the interpretati ns and conclusions presented herein in accordance with generally accepted principles and practice. Conclusions presented in this report are'professional opinions based on limited information obtained at the time of our site visits. Condor has endeavored.to determine as much as practical about the Site using conventional practices given our scope of services. Condor makes no representation as to the subsurface conditions at locations or times other than those sampled by our employees and reported in this document. If any changes are made or errors found in the information utilized in this report, the interpretations and conclusions contained herein shall not be considered valid unless the changes are reviewed by Condor and either appropriately modified or re-approved in writing. i is CONI