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.

The Superintendent of Tempe Union High School District contacted the Arizona Cancer Registry and asked for assistance in addressing a health concern. He explained that there is a perceived excess of brain tumors among students and staff at Corona del Sol with approximately eight to twelve brain tumors noted in the last few years. The concerns about tumors arose in conjunction with concerns about air quality.