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as the period when mass removal rates do not vary by more than 2% during four weekly <br /> monitoring events and when VOC vapor concentrations do not vary by more than 20% over <br /> four weekly monitoring events. <br /> Static VOC vapor concentration- This is an undisturbed and undiluted soil vapor sample <br /> collected after SVE system has been shutdown and the soil gas system has reached <br /> equilibrium. <br /> 12 <br />