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Ten-year monitoring and data assessment of a petroleum-hydrocarbon spill site were introduced to measure the effectiveness of natural attention at the site. For one decade, the monitoring of groundwater was conducted and collected data were analyzed to be used for the remediation of groundwater and soil for the future land development. The project site was previously used as gas station and car wash business. Typical groundwater contaminants such as TPH-G, BTEX, and oxygenates (MTBE, DIPE, ETBE, TAME, and TBA) were persistently found at the studied site. The plume and concentrations of monitored contaminants kept changing for the entire monitoring period. For this specific site, natural attenuation was unlikely feasible due to unfavorable environmental conditions. As a remediation strategy, other remediation options must be considered. The combinational method including a clean-up technology and natural attenuation is also recommended.