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" ~~~ levels in piezometers or conduits would be above static water levels in the overlying ground-water aquifer. Operating pressures can then be stipulated which would limit this area to a size that presents accept- ably small risks or is monitorable. The size of the critical area should be determined by the methods outlined in Chapter 5. An important requirement is the quantification of the hydraulic properties of the disposal zone. The applicant would be responsible for conducting tests to determine these properties. This need not be done if the applicant is willing to accept a low operating fluid level, such as the base of fresh water or lower, that could be stipulated based on expectation of worst-case conditions. If the appli- cant desires the maximum prudent operating fluid level or pressure, he would accept the responsibility for gathering the data necessary for determination of that limit in a technically sound manner. Uell tests would have to be carefully conducted in order to define the response of the disposal zone to injection. The parameters to be determined include the storativity and flow capacity of the disposal zone. Determination of the storativity will require use of one or more observation wells during the test. The validity of measurements taken in such a well should be confirmed by assuring that the response of the observation well is representative of the reservoir using methods described in Chapter 5. If the hydraulic parameters of the disposal reservoir are known, an initial set of curves of pressure versus distance from the injection well can be constructed for various flow rates by assuming the aquifer is of infinite areal extent. Next, curves can be constructed to depict equivalent water levels for different fluid densities likely to occur in possible conduits through the confining beds. Additional sets of curves 122