典型加油站石油烃污染场地环境调查及风险评估方法应用

Application on Environmental Investigation and Risk Assessment Methods for Petroleum Hydrocarbon Pollution Sites in Typical Gas Stations

针对加油站石油烃污染场地环境调查及风险评估,分别明确其调查评估程序、检测项目、检测方法及计算方法。以某加油站为研究对象,经检测总石油烃检出率最高(100%),苯系物检出率次之(均超15%),甲基叔丁基醚(MTBE)检出率为13%,其他污染物检出率较低(小于10%)。在有检出的污染物中,除总石油烃、苯系物及MTBE外,其他污染物含量均远低于筛选标准值。地下水样品则未检出污染物。经风险评估,土壤中石油烃(C_(10)–C_(40))、苯、MTBE为关注污染物。苯的致癌风险和危害商均超过可接受范围,且超标点位位于原地下储罐区域,建议对其进行修复。

For the environmental investigation and risk assessment of petroleum hydrocarbon contaminated sites in gas stations,the investigation and assessment procedures,detection items,detection methods and calculation methods are defined respectively.Taking a gas station as the research object,through preliminary investigation,Aamong soil samples,the detection rate of total petroleum hydrocarbons is the highest(100%),followed by benzenes(all more than 15%),MTBE is 13%,and other pollutants is low(less than 10%).Among the detected pollutants,except for total petroleum hydrocarbons,benzene analogues and MTBE,the content of other pollutants is far lower than the screening standard value.No pollutants were detected in groundwater samples.According to the risk assessment,petroleum hydrocarbons(C_(10)-C_(40)),benzenes and MTBE in the soil are the pollutants of concern.The carcinogenic risk and hazard quotient of benzenes exceed the acceptable range,and the point exceeding the standard is located in the original underground storage tank area,so it is recommended to repair it.