The Small Business Liability Relief and Brownfields Revitalization Act, an amendment to the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), defines a brownfield site as real property, the expansion, redevelopment or reuse of which may be complicated by the presence of a hazardous substance, pollutant, or contaminant ...
Chronic pain management always require higher dose of hydrocodone due tolerance. The maximum recommended dose for the hydrocodone is 60mg/day which is equivalent to 12 tablets of (5/325). As you go up, the risk of side effects and toxicity increases. Combining one and more product has synergistic effect. You can read more about it from here.
Hyrdrocodone (Lortab; Lorcet) comes in 5, 7.5 and 10 mg oral dosages. The 500 mg that you mention is the amount of acetamenophen in combination with the hydrocodone. A 500 mg dose of Lortab would, I'm sure, be deadly to anyone, even the most tolerant addict.