Test region pressure history measured during the May 20, 1986 DPD02 gas flow test. Test region pressure history measured during the January 20. 1987 DPD02 gas flow test. Test region pressure measured during the May 20. 1986 DPH01 gas flow test. Guard region pressure measured during the May 20. 1986 DPH01 gas flow test. Test region temperature measured during the May 20, 1986 DPH01 gas flow test. Test region pressure measured during the DPH01 brine flow test initiated on May 22. 1986. Guard region pressure measured during the DPH01 brine flow test initiated on May 22. 1986. IV

This paper describes preliminary interpretation of in-situ pressure and flow measurements of the Salado Formation at the Waste Isolation Pilot Plant (WIPP). The WIPP facility is located 660 m underground in the Salado, a bedded salt deposit. Shut-in pressure tests were conducted prior to, and subsequent to, the mining of a circular drift in order to evaluate excavation effects on pore pressure, permeability, and host rock heterogeneity. Borehole deformation was measured during these tests and used to correct for changes in the test region volume due to salt creep effects. Preliminary pre-excavation results indicate that the flow properties of this layered host rock are heterogeneous. Resulting pore pressures range from 1 to 14 MPa and permeabilities range from below measurable to about 1 nanodarcy. Normalized borehole diameter change rates were between -4 and 63 microstrains/day. Shut-in pressures and borehole diameters in all test boreholes were affected by the excavation of Room Q coincident with the advances of the boring machine. Preliminary results from post-excavation test results show decreased pore pressures compared to pre-excavation values.

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Data from detailed tracer concentration decay and induced pressurization measurements were obtained in tests of duplex and row apartments at Norfolk, Virginia and Pensacola, Florida to accurately determine air leakage characteristics of selected naval housing. Local meteorological information also was collected to facilitate comparison of predicted versus measured air leakage rates. For the Norfolk data, the 4-Pa leakage areas inferred from pressurization/depressurization measurements are uniformly lower than those calculated from the measured tracer dilution air leakage rate via the Sherman air leakage model. Considerable tracer dilution testing was performed on a single unit of duplex housing at Pensacola. Air leakage testing within rooms of this unit disclosed a uniformly low air leakage rate. The data also illustrated the directional nature of air leakage in a duplex. Of particular additional interest were two measurements taken over a 24-h period utilizing a single tracer injection followed by monitoring of dilution decay. Samples were taken by the container method and analyzed.

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