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초록

This study is aimed to establish a water quality assessment system for the unintentional outflow of groundwater in the development of underground facilities and its application for various purposes. Water quality recommendation standards were formulated for each of the five potential uses for seeping groundwater, including 11 water quality parameters such as pH, fecal coliforms(or E. coli), turbidity, BOD, TOC, color, nitrate, total phosphorus, suspended solids, iron, and chloride. A total of 333 effluent groundwater samples collected between 2017 and 2019 were analyzed, and the results were compared with the water quality recommendation standards for specific uses. As a result, it was found that the suitability ratios of groundwater with respect to water quality standards for each use ranged from 62% to 80%. Therefore, together with river discharge, the seepage groundwater can be used for various purposes, such as cleaning and gardening. The suitability rate of outflow groundwater fro