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Case Narrative <br />CONDOR EARTH <br />21663 Brian Lane <br />Sonora, CA 95742 <br />John Lane <br />Lab Job <br />Number: <br />514512 <br />Project No:RIVERBACK CITY <br />DUMP <br />Location:Riverback City Dump <br />Date Received:08/21/24 <br />This data package contains sample and QC results for twelve three-point soil composites and two soil samples, <br />requested for the above referenced project on 08/22/24. The samples were received cold and intact. <br />Report revised and reissued 10.02.2024 to include 8290 dioxins and furans results. <br />TPH-Extractables by GC (EPA 8015M): <br />COMPOSITE DP-12 (lab # 514512-047) was diluted due to the dark color of the sample extract. <br />No other analytical problems were encountered. <br />Semivolatile Organics by GC/MS (EPA 8270C): <br />COMPOSITE DP-21 (lab # 514512-040) was diluted due to the dark color of the sample extract. <br />A number of samples were diluted due to the dark and viscous nature of the sample extracts. <br />No other analytical problems were encountered. <br />Semivolatile Organics by GC/MS SIM (EPA 8270C-SIM): <br />A number of samples were diluted due to the dark and viscous nature of the sample extracts. <br />No other analytical problems were encountered. <br />PCBs (EPA 8082): <br />High surrogate recoveries were observed for decachlorobiphenyl (PCB) in COMPOSITE DP-13 (lab # 514512-048) <br />and the MS/MSD of COMPOSITE DP-13 (lab # 514512-048). <br />A number of samples were treated with sulfuric acid to reduce analytical interferences or due to the presence of color. <br />No other analytical problems were encountered. <br />Metals (EPA 6010B and EPA 7471A): <br />Low recoveries were observed for antimony in the MS/MSD of COMPOSITE DP-15 (lab # 514512-038); the LCS was <br />within limits, and the associated RPD was within limits. High recoveries were observed for barium and lead; the LCS <br />was within limits, and the associated RPDs were within limits. <br />No other analytical problems were encountered. <br />pH of Solid Samples (EPA 9045C): <br />No analytical problems were encountered. <br />Dioxins & Furans (EPA 8290): <br />No analytical problems were encountered. <br />Asbestos by PLM (EPA 600/R-93-116): <br />No analytical problems were encountered. <br />1 of 1 <br />4 of 95