This is the second phase of a two-phase study to evaluate the feasibility of lowering the minimum gas pressure in solution-mined caverns through the use of an advanced constitutive model for salt in cavern design. The purpose of this study is twofold: (1) to develop an efficient laboratory test matrix that can be used to determine the site-specific model parameter values for the Multimechanism Deformation Coupled Fracture (MDCF) constitutive model and (2) to estimate the potential cost benefits gained as a result of using the MDCF model in cavern design. The sensitivity of test specimen response to each of the MDCF model parameters was estimated using numerical simulations of laboratory tests. The results of the sensitivity analysis were used to provide guidance in designing an efficient test matrix comprised of load paths and boundary conditions attainable in most modern laboratory facilities. The resulting test matrix includes 27 tests to determine constitutive parameters, 12 tests to determine strength properties, and ten mineralogic analysis tests to determine salt impurity content. The possible cost benefits of using the MDCF model in cavern design are the result of lowering the minimum gas pressure and thus maximizing the working gas to cushion gas ratio. The cost benefits are analyzed by comparing the reduced storage costs to the additional cost of using the more advanced MDCF constitutive model. It is estimated that even a small decrease in the minimum gas pressure will cover the costs of adopting the MDCF constitutive model within the first year or two of operation.