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.~_ z: . . APPROACH The approach consists of measuring, by accepted laboratory techniques, the water retention curves on up to 200 separate samples taken from the Castle Pines continuous core. All distinct lithologies exhibited by the core will be included. The water retention curves will be measured by the pressure plate technique (ASTM D 2325 and ASTM D 3152). The porosity and permeability to air will be measured on each sample, as well. The water retention curves will be used to determine the specific yield at up to 200 points along the length of the well bore. Response from selected geophysical well logs will be numerically correlated with the laboratory measurements. A variety of correlations will be attempted as suggested by both theoretical considerations and the data. Error analyses and correlations coefficients will be used to establish statistical confidence intervals on all relationships that can be established. TIME SCHEDULE Work will begin immediately following completion of the Castle Pines coring project and upon the execution of a Memorandum of Understanding between Castle Pines officials and Colorado State University. It is expected that sampling of the core and sample preparation would begin on or about May 1, 1987. Visual inspection of the core and available geophysical logs will be used to select about 100 samples for first-phase testing and analyses. It is anticipated that laboratory measurements and correlation analyses can be completed on these first-phase samples by July 15, 1987. Results from the first-phase tests and analyses will be used to guide a second sampling of the core on or about August 1, 1987. Results of measurements on the second 100 samples should be available by about October I. A preliminary report on work accomplished through August 1 will be issued by August 30, 1987. This report, while serving as a progress document relative to the work described herein, will also constitute a report to the Colorado Water Resources Research Institute as required by a currently funded project ending on August 30, 1987. A final report on all aspects of the work described in this proposal will be completed not later than December 31, 1987. FACILITIES All laboratory measurements will be conducted in the Porous Media Laboratory at the Engineering Research Center, Colorado State University. All equipment required for this project is already available and is routinely used for similar work. Eight pressure cells and associated apparatus are available, providing the capability of making water retention measurements on up to 50 samples, simultaneously.