Natural and artificial factors affecting groundwater flow and transport in the vicinity of an LPG storage site were examined to understand the groundwater flow and transportregime around LPG storage caverns. The cross-correlation analysis results showed that the 11-year monitoring data of groundwater head and seepage water into caverns were mainly controlled by rainfall and cavern operation pressure. The result of seepage rate being mainly controlled by operation pressure support the dependence on operation pressure rather than rainfall and microbial clogging. Hydrogeochemical analysis results in the site showed the influence of sodium hypochlorite (NaOCl), used in disinfection activity to remove microbial clogging around caverns and water curtains. Due to the chemical characteristics of NaOCl, the groundwater compositions of wells around caverns selectively showed high pH, sodium, and chloride concentrations. Heterogeneous distribution of sodium and chloride regardless of distance from water curtains and caverns implied the channelling effect of the fractured medium. The faults and associated fractures, which act as groundwater conduits in the site, are considered to be themain factors causing the hydrochemical heterogeneity. The distribution of hydrogeochemical constituents in groundwater shows that the major part of groundwater flow and transport occursfrom structurally formed high-recharge zones to cavern seepage zones.

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