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LABORATORY NARRATIVE <br />Modified ASTM D-1946 <br />Arcadis U.S., Inc. <br />Workorder# 2001401BR1 <br />Two 1 Liter Summa Canister (100% Certified) samples were received on January 17, 2020. The <br />laboratory performed analysis via Modified ASTM Method D-1946 for Methane and fixed gases in air <br />using GC/FID or GC/TCD. The method involves direct injection of 1.0 mL of sample. <br />On the analytical column employed for this analysis, Oxygen coelutes with Argon. The corresponding <br />peak is quantitated as Oxygen. <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 ModificationsASTM D-1946 <br />Calibration A single point <br />calibration is performed <br />using a reference <br />standard closely <br />matching the <br />composition of the <br />unknown. <br />A minimum of 5-point calibration curve is performed. <br />Quantitation is based on average Response Factor. <br />Reference Standard The composition of any <br />reference standard must <br />be known to within <br />0.01 mol % for any <br />component. <br />The standards used by ATL are blended to a >/= 95% <br />accuracy. <br />Sample Injection Volume Components whose <br />concentrations are in <br />excess of 5 % should <br />not be analyzed by <br />using sample volumes <br />greater than 0.5 mL. <br />The sample container is connected directly to a fixed <br />volume sample loop of 1.0 mL on the GC. Linear range is <br />defined by the calibration curve. Bags are loaded by <br />vacuum. <br />Normalization Normalize the mole <br />percent values by <br />multiplying each value <br />by 100 and dividing by <br />the sum of the original <br />values. The sum of the <br />original values should <br />not differ from 100% <br />by more than 1.0%. <br />Results are not normalized. The sum of the reported <br />values can differ from 100% by as much as 15%, either <br />due to analytical variability or an unusual sample matrix. <br />Precision Precision requirements <br />established at each <br />concentration level. <br />Duplicates should agree within 25% RPD for detections > <br />5 X's the RL. <br />Receiving Notes <br />The Chain of Custody (COC) was not relinquished properly. A time was not provided by the field <br />sampler. <br />Page 3 of 11