ARCHIVED REPORTS_TEMPORARY SOIL GAS PROBE PERMIT APPLICATION PACKAGE

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SOP TO-14A/15 Rev 4 December 2007 ' To prepare a calibration curve: 1. Turn on the Entech system. 2. Load a Method(e.g.0919TO.mth) into the software. Schedule the autosampler and concentrator for the correct Method (CO2naph.mth). f3. Entech: Schedule the concentrator and autosampler to analyze standards of 25, 50, 100, 250, 375, 500 and 1000 mL of standard, respectively while delivering 50 mL of internal standard/surrogate mix. ' This is equivalent in a 50 mL sample to 5, 10, 20, 50, 75, 100, 200 ppbv while the I.S/surr. Is kept at 25 ppbv. Program the AGILENT software to collect data for the standards. Start the sequence on the AGILENT software and the Entech software. ' 4. After completing the standards, quantitate and load the standards as the initial calibration. Evaluate the initial curve for linearity and response factors per the current version of EPA Method TO-14A/15 (or project specific DQO's). This is currently that .. a. All compounds must have RSD<30%with at most two exceptions to be RSD<40%. The ' RRT for each target compound at each calibration level must be withing 0.06 RRT units of the mean RRT for the compound. The area response of each internal standard for each calibration level must be withing 40% of the mean area response over the initial calibration range. b. For certain regulatory requirement such as EPA Region 9 the calibration curve must be ' verified by a second source standard by analyzing the standard in the same manner as the initial calibration was performed. Acceptance is<or= 30% deviation for all compounds. Two compounds may be <40%deviation. This criteria will be met only be as required. 1 8.2 Initial Calibration Filename Format ' The initial calibration is saved as part of the Chemstation method in the format MMDDYY##.m where MMDDYY is the date and## indicates method type. (e.g., 080106TO, indicating an initial calibration performed on August 1, 2006 for a TO-15 Method) ' 9.0 Sample Collection ' It is the responsibility of the field scientist(geologist, consultant, etc.),to collect all vapor or air samples in manners which are consistent with protocol as set forth by federal, state and local regulatory agencies. The lab operator should assist in any manner possible but the ultimate responsible lies with the sampler to assure ' that samples are taken in proper containers with preservatives if required. Care should be taken by the lab operator to insure that samples are not inadvertently contaminated in the lab. ' Page 8 of 24