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AIR TOXICS LTD. <br /> AN ENVIRONMENTAL ANALYTICAL LABORATORY <br /> LABORATORY NARRATIVE <br /> Modified TO-15 <br /> Brown and Caldwell <br /> Workorder#0605369 <br /> One i Liter Summa Canister sample was received on May 15, 2006 The laboratory performed analysts via <br /> modified EPA Method TO-15 using GC/MS in the full scan mode The method involves concentrating up to <br /> 0 2 liters of air The concentrated aliquot is then flash vaporized and swept through a water management <br /> system to remove water vapor Following dehumidification, the sample passes directly into the GC/MS for <br /> analysis <br /> Method modifications taken to run these samples are summarized in the below table Specific project <br /> requirements may over-ride the ATT,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 /> The reported result for 4-Ethyltoluene in sample INFLUENT may be biased high due to co-elution with a <br /> non target compound with similar charactenstic ions Both the primary and secondary ion for 4-Ethyltoluene <br /> exhibited potential interference <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 I nit (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 CCV <br /> N - The identification is based on presumptive evidence <br /> Page 2 of 12 <br />