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L <br />C <br />L <br />0 <br />u <br />11 <br />0 <br />J <br />L� <br />n <br />AN ENVIRONMENTAL ANALYTICAL LABORATORY <br />LABORATORY NARRATIVE <br />Modified TO -14A Soil Gas <br />SCS Field Services <br />Workorder# 0901481 <br />The laboratory performed analysis via. modified EPA Method TO -14A using GC/MS in the full scan mode. <br />The method involves concentrating up to 50 mLs of air. The concentrated aliquot is then flash vaporized and <br />swept through a water management system to remove water vapor. Following dehumidification, the sample <br />passes directly into the GUAS for analysis. <br />This workorder was independently validated prior to submittal using'USEPA National Functional Guidelines' <br />as generally applied to the analysis of volatile organic compounds in air. A rules -based, logic driven, <br />independent validation engine was employed to assess completeness, evaluate pass/fail of relevant project <br />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 -14A <br />ATL Modifications <br />Initial Calibration <br />+- 30 % RSD <br /></= 30 % RSD with 2 compounds allowed out to < 40 %. <br />Daily CCV <br />+_ 30 % D <br /></= 30 % D with 2 allowed out up to 40%; flag and narrate <br />associated sample results <br />BFB Tune Absolute Abundance <br />Criteria <br />Within 10% of that <br />from the previous day. <br />CCV Internal Standard area counts are compared to the <br />ICAL; corrective action for > 40 %D <br />Blank acceptance criteria <br />< 0.2 ppbv <br />< RL <br />Sampling Drying System <br />Nafion Dryer <br />Multisorbent concentrator <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 />Receiving Notes <br />There were no receiving discrepancies. <br />Analytical Notes <br />There were no analytical discrepancies. <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 nol <br />performed). <br />J - Estimated value. <br />E - Exceeds instrument calibration range. <br />Page 3 of 51 <br />