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LABORATORY NARRATIVE <br />EPA Method TO-15 <br />San Joaquin County Solid Waste/Public Works <br />Workorder# 2505216 <br />Ten 1 Liter Summa Canister samples were received on May 09, 2025. The laboratory performed analysis <br />via EPA Method TO-15 using GC/MS in the full scan mode. <br />The Chain of Custody (COC) information for samples SG-11AD and SG-6AD did not match the entries <br />on the sample tags with regard to sample identification. Therefore the information on the COC was used <br />to process and report the samples. <br />Receiving Notes <br />All Quality Control Limit exceedances and affected sample results are noted by flags. Each flag is defined <br />at the bottom of this Case Narrative and on each Sample Result Summary page. <br />Dilution was performed on sample SG-01 due to the presence of high level target species. <br />Analytical Notes <br />Ten qualifiers may have been used on the data analysis sheets and indicates as follows: <br /> B - Compound present in laboratory blank greater than reporting limit (background subtraction not <br />performed). <br /> J - Estimated value. <br /> E - Exceeds instrument calibration range. <br /> S - Saturated peak. <br /> Q - Exceeds quality control limits. <br /> U - Compound analyzed for but not detected above the reporting limit, LOD, or MDL value. See <br />data page for project specific U-flag definition. <br /> UJ- Non-detected compound associated with low bias in the CCV <br /> N - The identification is based on presumptive evidence. <br /> M - Reported value may be biased due to apparent matrix interferences. <br /> CN - See Case Narrative. <br />File extensions may have been used on the data analysis sheets and indicates <br />as follows: <br /> a-File was requantified <br /> b-File was quantified by a second column and detector <br /> r1-File was requantified for the purpose of reissue <br />Definition of Data Qualifying Flags <br />Page 3 of 36