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Note- Although the vapor extraction test protocol and results are consistent with current <br /> theory and practice, tests have many possible sources of error Errors can include, <br /> but are not limited to, gravel pack and well construction influences, formational skin <br /> effects, heterogeneities and isotropies in the subsurface, and undefined conditions <br /> that violate fundamental test or analytic assumptions <br /> HYDROCARBON CONCENTRATIONS IN SOIL, GAS <br /> To evaluate the range and levels of hydrocarbon vapor present in the subsurface, a vapor <br /> sample was collected from the test well MW-10, and submitted to a California-certified <br /> laboratory for analysis. An air sample collected from MW-10 during the vapor extraction <br /> test was analyzed for TPH-G and BTEX using EPA modified CARB Method 410A, for low <br /> level aromatics in air. Results of laboratory analysis the air sample are presented in Table 3 <br /> below Official laboratory report and a chain of custody record is included in Appendix C. <br /> The vapor sample collected from MW-10 exhibited total petroleum hydrocarbon vapor <br /> concentrations of 38,000 ppmv, or 150,000 micrograms per liter (µgfl) <br /> TABLE 3 <br /> RESULTS OF EFFLUENT VAPOR SAMPLE ANALYSIS <br /> VAPOR SAMPLING [7C?NCENTRATIONS IN PARTS PER BILLION <br /> 1 WELL�'I®I SATE <br /> WE <br /> LI.< IIS 7f'I'H-� <br /> MW-10 05-29-92 38,000 660 190 16 110 ATL <br /> EXPLANATION OF ABBREVIATIONS <br /> TPH-G . total petroleum: hydrocarbons quantified as gasoline. <br /> B benzene <br /> T toluene <br /> E ethytbenzene <br /> X total xylenes <br /> ATL Air Tw ics LTD <br /> 5 <br />