Soil and groundwater is the final receptor environment of contamination on land, especially easy to contaminate groundwater aquifers, because of the underground environment often obscure, it is difficult to clarify the scope of pollution, in addition, the transport and chemical transformation process are also difficult to evaluate. Resulting that although consumes on huge cost and materials, and times on oil contaminated site investigation and remediation, obtaining the solution of the problem is still hard. In this study, it combines with the environmental site assessment and the triad rapid investigation, the establishment of site contamination conceptual model, the key designated contaminated area, collect samples of the implementation for laboratory analysis, Moreover, use cyclic evaluation process, continuously updated site conceptual model, to clarify the distribution of contaminated sites, impact of pollution, hydro-geological characteristics and pollution sources. It also discussed the effective reduction of pollution critical area, to obtain high-density results, in order to improve sampling and analysis to make the efficiency of the case of site investigation, and using environmental forensic techniques to determine and provide the evidence of pollution sources. ESA phase I implements the key results of the preliminary delineation of contaminated areas, soil and groundwater pollution concerns and possible sources of material. ESA phase II evaluates preliminary assessment of sites contaminated soil contamination is a high carbon number of oil and contaminants move to the surface to deeper soil 9 m at the lower, deeper pollution range is unknown. Groundwater test results garnered less than control standards, but the detection of trace gas station in MTBE, it is included in the possible sources of pollution. Taking ESA phase II assessment in a further analysis, the soil contaminants are TPHC10-C40 based, contamination depth of 8m, gas station area within the tank and pipeline testing values are low, there is no sign of oil leakage. Pollution more than 5m in depth the most serious, TPH concentrations in general are 10,000 mg/kg or more, the depth of 5m and the following have been significantly reduced, TPH concentrations than in the 5,000 mg/kg or less. Interviews showed that the specific relationship between the people, suspected underground oil refining line set 40 years ago, suspected of shipping oil from the waste obtained after the hull, after the system by then resold for profit. Identification of pollution sources than the results, TPHC10-C40 carbon number distribution or pattern of the peak are more similar to diesel. TIC illustration showed that the distillate oil mixture for two, than the peak apex, suggesting that the low-carbon should be diesel fuel, and the high-carbon would be fuel. Pr/Ph ratio than, presumably with the CPC diesel from different sources. Alkyl bicyclic sesquiterpene class fingerprint comparison results, the shape of the fingerprint sample slightly different, but the main features of the same types of compounds. Analysis of aromatic compounds, indicators showed that the samples compound ratio of methyl phenanthrene and methyl dibenzothiophene isomers, dibenzothiophene, and phenanthrene isomers are closer. Integrated fingerprint analysis (fingerprinting) results, similar to the site characteristics of pollutants, for the same pollution source. The site is semi-volatile pollutants, substances insoluble in water, more stored in the main pollution silt/clay layer, subject to geological conditions, ground remediation techniques are more difficult to grasp in the transmission path, remediation systems that require high density, break through the bottleneck transmission path, but a majority of sites on private land, during the remediation process it is difficult to obtain the burgage, therefore, it would be fit the inappropriate comprehensive ground handling. Subsequent remediation plan can be removed towards the high pollution of soil pollution, and long-term monitoring of permeable reactive barrier type with natural degradation. Recommendations for the future studies can be dust inhalation and skin contact with soil, groundwater ingestion, inhalation and skin contact exposure pathways for risk assessment, site management provided a basis for administrative control.