ARCHIVED REPORTS_TEMPORARY SOIL GAS PROBE PERMIT APPLICATION PACKAGE

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1 SOP TO-14A/15 Rev 4 December 2007 ' For the qualitative identification of each compound the analyst will follow the guidelines in Method TO- 15,second edition Jan. 1999 Section 10.8 ' 13.6 Reporting Limits The normal reporting limits for all compounds are nominally 1-2 ppbv. These limits should be compared ' annually to the MDL's to make certain that they are appropriate. Depending upon client data quality objectives (DQO's) H&P may report lower than these values. The reporting limits, however, should be no lower than the MDL calculated at initial instrument checkout and updated yearly or at major instrument overhaul. Results reported that are between the R.L. and the MDL should be flagged with the"J"flag as a quantitative estimate. The"J" flag means the concentration reported is between the MDL and the EQL. Reporting limits may be raised to accomplish specific data quality objectives as clients or regulatory ' agencies dictate with no effect on the data or flags required. When samples are diluted for TO-14A/15, the reporting limits are raised proportionately. All multipliers ' must also be applied to the reporting limits as well. Dilutions are recorded on the daily extraction/run logs and are entered into the AGILENT chemstation software for the particular analysis. t13.7 Precision Bias and Working Range The applicable working range of the analyses for the EPA Method TO-14A/15 is dependent upon the ' concentrations of the calibration standards used while developing the calibration curve for the instrument. This calibration curve is discussed in Section 8.0. Generally, the working range of the instrument is between the detection limit for the analyte and the concentration of the high standard used for system calibration (normally 200 ppbv). In the event that sample results are greater than the amount used for the high standard, then sample dilution may be necessary. If the sample result is greater than the high standard then the sample must be diluted and reanalyzed or the "E" flag (estimated value) used to qualify the data. In the case of soil ' vapor samples, the"E" flag will be used if the sample is greater than 150%of the high standard per LARWQCB protocol. "E" flag means the analyte amount exceeds calibration range and the amount reported is quantitated by extrapolation. ' 14.0 Computer Hardware and Software ' Agilent Technologies enviroquant software running on Pentium (or equivalent)PC's under Windows XP operating system is the data acquisition system. Chromatograms and quantitation reports are printed out on ' laser printers. 15.0 Data Management and Records Management ' Document control is the process by which the documentation associated with samples and sample data are tracked and monitored. ' 15.1 Chain of Custody Record ' Page 15 of 24