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IA <br />AN ENVIRONMENTALANALYTICALL LABORATORY • <br />LABORATORY NARRATIVE <br />Modified TO -15 xAao <br />URS Corporation <br />Workorder# 0710143 <br />Six 1 Liter Summa Canister samples were received on October 04, 2007. The laboratory performed <br />analysis via modified EPA Method TO -15 using GC/MS 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 <br />a water management system to remove water vapor. Following dehumidification, the sample passes <br />directly into the GC/MS for analysis. <br />This workorder was independently validated prior to submittal using 'USEPA National Functional <br />Guidelines' as generally applied to the analysis of volatile organic compounds in air. A rules -based, <br />logic driven, independent validation engine was employed to assess completeness, evaluate pass/fail of <br />relevant project quality control requirements and verification of all quantified amounts. <br />Method modifications taken to run these samples are summarized in the table below. Specific project <br />requirements may over -ride the ATL modifications. <br />Requirement <br />TO -15 <br />ATL Modifecadons <br />Daily CCV <br />+- 30% Difference <br />4= 30% Difference with two allowed out up to <br /><=40%.; flag and narrate outliers <br />Sample collection media <br />Summa canister <br />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 <br />Follow 40CFR Pt.136 <br />The MDL met all relevant requirements in Method <br />App. B <br />TO -15 (statistical MDL less than the LOQ). The <br />concentration of the spiked replicate may have exceeded <br />1.1 the calculated MDL in some cases <br />Receivine Notes <br />There were no receiving discrepancies. <br />Analytical Notes <br />The reported CCV for each daily batch may be derived from more than one analytical file due to the <br />client's request for non-standard compounds. <br />Non-standard compounds may have different acceptance criteria than the standard TO-14AJTO-15 <br />compound list as per contract or verbal agreement. <br />Definition of Data Oualifvin¢ Flaw <br />Eight qualifiers may have been used on the data analysis sheets and indicates as follows: <br />Page 2 of 26 <br />E <br />