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Imminent Threat to Human Health or Safety or the Environment Specific to the Underground Storage Tank(UST)program element, imminent threat to human health, safety or the environment is a condition that includes the following: (1) Creates a substantial probability of harm, (2) When it is necessary to take immediate action to prevent,reduce, or mitigate the actual or potential damages to human health or safety or the environment. Significant Non-Complier The Department of Toxic Substances Control (DTSC) and the U.S. Environmental Protection Agency (US EPA) have designated a type of hazardous waste violator as a "Significant Non- Complier"(SNC). An SNC is a handler who: (1) Has caused actual exposure or substantial likelihood of exposure to hazardous waste or hazardous constituents; or (2) Is a chronic (a handler who is regularly found to have many Class I or Class II violations) or recalcitrant violator (a handler who actively refuses to comply with the regulatory requirements); or (3) Substantially deviates from the terms of a permit, Order, settlement document, or decree by not meeting the requirements in a timely manner and/or by failing to perform work as required by terms of permits, Orders, settlement agreements, or decrees; or (4) Substantially deviates from statutory or regulatory requirements. SNCs represent the category of violators that merit the most stringent and timely enforcement response. SNCs require formal enforcement action and must be closely tracked to ensure timely and appropriate enforcement. Significant Threat Significant threats are to be determined based on the volume and relative hazard of the material/waste,proximity of the population at risk, and the potential for harm to public health and the environment. Significant Violation Significant Violation in the UST Program element is a violation, including but not limited to the following: (1) Causing or threatens to cause a liquid release of petroleum from the UST system, impairs the ability of a UST system to detect a liquid leak or contain a liquid release of petroleum such as tampering with leak detection equipment. (2) A chronic violation or a violation that is committed by a recalcitrant violator. Violation Classification Guidance for UPAS Page 8