This report i s the f i r s t i n a three-part series summarizing work performed This work was performed by Los a t the El Salvador Ahuachapirn geothermal f i e l d. Alamos, i t s Salvadoran counterpart, La Comisi6n Ejecutiva H i d r o e l k t r i c a del Rio Lempa (CEL), and other consultants. I t was funded by the US Agency f o r

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Initial measurements to evaluate the feasibility of extracting energy from hot-dry rock in Precambrian basement (granite) employing hydraulic-fracturing techniques was explored in the LASL Granite Test Hole No. 1 . Following a series of hydrology experiments in the 785-m (2575 ft) depth hole, preparations were made to instrument a series of hole-pressurization and hydraulic-fracturing experiments. The instrumentation was designed to measure breakdown pressure, crack-extension pressure, and shut-in pressure for each fracture and to determine principle tectonic stresses, breakdown stress for hydraulic fracturing, and leak-off rate €or fracturing fluid.

This report ullls prepared as an account of w k sponsored by an agency of the United States Gvvernment. Neither the United States Government nor w agency ther4, nor any oftheir employees, makes any wrranty, express or implied, or assumes any legal fity fw the accuracy, completer~~, or ~l m of-@@?nation, ,or process disclosed, or represents that its use m l d not tnfnnge rights. Reference herein to any specifc commercial product, p r w s , or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its mdorsonent, recommendation, m-ng by the United States Gowrnment or any agency thereof. The mews and opinions of authors rrprffsed herein do not necessarily state or refecf those of the United States

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