The Arizona Department of Transportation, the Arizona Game & Fish Department and the Arizona State Parks Board are required to conduct a study every three years on watercraft fuel consumption and recreational watercraft usage. The fuel consumption data is collected to determine the allocation of motor vehicle fuel tax to the State Lake Improvement Fund. The information on recreational watercraft usage patterns on Arizona’s lakes and rivers is necessary, in part, to determine the distribution of SLIF funds to applicants.

Each year vehicular accidents cause gasoline and diesel spills on Arizona roadways. ADOT currently uses Micro-Blaze®, a commercially available microbial solution, as a supplement to natural degradation of vehicular petroleum spills in soils. With an emphasis on minimizing or eliminating environmental and public health hazard, ADOT is interested in determining cost-effective methods to address spills involving petroleum products from roadway vehicular accidents. This study investigated whether Micro-Blaze, Hydro Clean®, Miracle-Gro®, or water accelerated the degradation process significantly over natural processes and that it will help to determine their effectiveness in accelerating the remediation of petroleum products (diesel No. 2 and unleaded gasoline) on predominant Arizona soil types from roadway vehicular accidents.

The Arizona Department of Health Services completed this health consultation at the request of the Arizona Department of Environmental Quality. This consult evaluates whether soil vapors from volatile organic compounds in the subsurface near the Silver Creek Subdivision in Tucson, Arizona are present at levels that may cause adverse health effects.