API Publ 4741 pdf download.Collecting and Interpreting Soil Gas Samples from the Vadose Zone 2.2 Measured Soil Gas Profiles at Petroleum Hydrocarbon Impacted Sites To better illustrate the connection between the conceptual model shown in Figure 2-2 and measured vertical soil gas profiles, sample soil gas profiles are shown in Figure 2-3 and Figure 2-4. Each of these profiles is...