Groundwater in bedrock - Hvaler project. Investigations at Testsite Reffsgård, borehole 1. (Capacity enhancement using EDTA)
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A 3\" borehole was drilled to 42 m at Reffsgård, and was found to have a negligible yield (< 0.1 l\/hr). In-sity stress measurement was then carried out, using hydraulic fracturing. Following this, the borehole was test-pumped and a short term yield of 156 l\/hr (24 m drawdown) was recorded. This enhancement was believed to be due to hydraulic fracturing. The borehole was then subjected to simple treatment using the surfactant EDTA, resulting in an apparent further increase to 170 l\/hr (24 m drawdown). This may be due to the EDTA, but it may also have been an artifact of excess head applied during treatment.