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i <br /> the ranges of porosity for these soil types overlap was used Porosity values for various soil <br /> types are presented in the notes section of the mass estimate tables The average concentration <br /> was assumed to be one-half of the value of the higher contour interval For the center contour <br /> interval, we assumed that the applicable concentration was the median of the highest detected <br /> value and the highest contour interval Tables Al, A2, and A3 presents the respective estimates <br /> and calculations for TPHg, benzene, and MTBE mass remaining in groundwater Based on the <br /> approach and assumptions presented above, the estimated TPHg, benzene, and MTBE mass in <br /> groundwater is approximately 38 94,4 42, and 0 47 pounds, respectively <br /> These contaminant mass remaining estimates are based on available site data, and an assumed <br /> static environment versus the true dynamic environment The error(t30%) associated with these <br /> estimates should be considered with any decision-malung <br />