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t <br /> LABORATORY NARRATIVE <br /> Modified TO-15 <br /> URS Corporation <br /> Workorder#0512184A <br /> Two 6 Liter Summa Canister samples were received on December 07, 2005. The laboratory performed <br /> analysis via modified EPA Method TO-15 using GUMS in the full scan mode. The method involves <br /> concentrating up to 0.2 liters of air. The concentrated aliquot is then flash vaporized and swept through a <br /> water management system to remove water vapor. Following dehumidification, the sample passes directly <br /> into the GUMS for analysis. <br /> Method modifications taken to nm these samples are summarized in the below table. Specific project <br /> requirements may over-ride the ATL modifications. <br /> Requirement TO-15 ATL Modifications <br /> Daily CCV +-30%Difference </=30%Difference with two allowed out up to</=40%.; <br /> flag and narrate outliers <br /> Sample collection media Summa canister ATL recommends use of summa canisters to insure data <br /> defensibility,but will report results from Tedlar bags at <br /> client request <br /> Method Detection Limit Follow 40CFR Pt.136 The MDL met all relevant requirements in Method TO-15 <br /> App.B (statistical MDL less than the LOQ).The concentration of <br /> the spiked replicate may have exceeded 10X the calculated <br /> MDL in some cases <br /> Receiving Notes <br /> There were no receiving discrepancies. <br /> Analytical Notes <br /> The reported LCS for each daily batch has been derived from more than one analytical file. <br /> Definition of Data Qualifying Flags <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 no <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. <br /> UJ- Non-detected compound associated with low bias in the CC V <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 /> Page 2 of 17 <br />