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LABORATORY NARRATIVE <br />Modified TO-15 <br />Arcadis U.S., Inc. <br />Workorder# 2001401A <br />Two 1 Liter Summa Canister (100% Certified) samples were received on January 21, 2020. The <br />laboratory performed analysis via modified EPA Method TO-15 using GC/MS in the full scan mode. <br />Method modifications taken to run these samples are summarized in the table below. Specific project <br />requirements may over-ride the EATL modifications. <br />Requirement ATL ModificationsTO-15 <br />Initial Calibration </=30% RSD with 2 <br />compounds allowed out <br />to < 40% RSD <br /></=30% RSD with 4 compounds allowed out to < 40% <br />RSD <br />Blank and standards Zero Air UHP Nitrogen provides a higher purity gas matrix than <br />zero air <br />Receiving Notes <br />The Chain of Custody (COC) was not relinquished properly. A time was not provided by the field <br />sampler. <br />A single point calibration for TPH referenced to Gasoline was performed for each daily analytical <br />batch. Recovery is reported as 100% in the associated results for each CCV. <br />Dilution was performed on sample 2001401A-02A due to the presence of high level target species. <br />Analytical Notes <br />Eight 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 <br />not 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 />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 />Definition of Data Qualifying Flags <br />Page 3 of 15