December 1988 - law change within the Resource, Conversation, and Recovery Act in the United Statesregarding underground piping.2. U.S. Environmental Protection Agency (EPA) requirement: Code of Federal Regulations (CFR), Title 40, Part 280.:2.1, Petroleum Products;2.2. Hazardous Substances (over 3200, CFR Title 40 Part 302.4);2.3. Hazardous Wastes.
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