This paper discusses the regionaZ geotogy and ' hydrology of tha Hanford Reservatibn with emphasis on the characteristies of the Lower Ringotd Forma: tion and the CoZumbia River BasaZts and interbeds. These formations constitute the uppermost confined fZow systems underZying the Hanford Reservation. Work shown in this paper Zeads to the conctusion that these aquifers are rather extensive and th«t they are interconnected especiaZZy atong the Umtanum-GabZe Antictine. Recharge into the confined aquifers appears to occur at the fringed of the Pasco Basin. The eastern portion of the Hanford Reservation appears to be a discharge area for these aquifers. Areas of monocZinal downfolding such as Cotd Creek vaZZey appear to act as flow barriers, thus heZping to buiTd up the pressure in the uppermost.confined aquifers.

This Report contoins informati on of a prel iminaty nature. It is subject to revision or correction and therefore does not represent a final Report. It was p repared primnrily for internal use within The R ockwell Hanford Operation~. Any expressed views and opinions are those of the Author and not necessaril y of the Company.

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The understanding thus far developed represents a preliminary base for initiating ah assessment of the environmental suitability of basalts as a final storage medium for radioactive wastes. Although the regional geology of the Columbia River Plateau is relatively well understood, additional workis needed to assess the tectonic stab.ility of the region and evaluate the extent •of regional as well as local fracturing and folding. The stratigraphic framework must be refined with emphasis on defining the hydrostratigraphic units in detail. The stratigraphic nomenclature needs to be standardized and made compatible with the work of other investigators in nearby areas.