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urfi Air Toxics LABORATORY NARRATIVE Modified TO-15 Low Level Advanced GeoEnvironmental Workorder# 1606238 Three 6 Liter Summa Canister (100% Certified) samples were received on June 10, 2016. The laboratory performed analysis via modified EPA Method TO-15 using GUMS in the full scan mode. This workorder was independently validated prior to submittal using 'USEPA National Functional Guidelines' as generally applied to the analysis of volatile organic compounds in air. A rules-based, logic driven, independent validation engine was employed to assess completeness, evaluate pass/fail of relevant project quality control requirements and verification of all quantified amounts. Method modifications taken to run these samples are summarized in the table below. Specific project requirements may over-ride the ATL modifications. Requirement TO-15 ATL Modifications Initial Calibration </=30%RSD with 2 </=30%RSD with 4 compounds allowed out to<40% compounds allowed out RSD to<40%RSD Blank and standards Zero Air UHP Nitrogen provides a higher purity gas matrix than zero air Receiving Notes The Chain of Custody (COC) information for sample IA-VW-rear did not match the information on the canister with regard to canister identification. The client was notified of the discrepancy and the information on the canister was used to process and report the sample(s). Analytical Notes Dilutions were performed on samples IA-VW-rear, IA-VW-front and IA-VW-show room due to the presence of high level target species. The reported result for 4-Ethyltoluene in samples IA-VW-rear, IA-VW-front and IA-VW-show room may be biased high due to co-elution with a non target compound with similar characteristic ions. Both the primary and secondary ion for 4-Ethyltoluene exhibited potential interference. All Quality Control Limit exceedances and affected sample results are noted by flags. Each flag is defined at the bottom of this Case Narrative and on each Sample Result Summary page. Target compound non-detects in the samples that are associated with high bias in QC analyses have not been Ragged. The Relative Percent Difference (RPD) of the LCS/LCSD exceeded acceptance limits for Bromomethane. Definition of Data Oualifyin2 Flags Eight qualifiers may have been used on the data analysis sheets and indicates as follows: B - Compound present in laboratory blank greater than reporting limit (background subtractior. Page 3 of 20