WAILUKU, Hawaii - Maui may be running out of sand, threatening not only its famous year-round beaches but the state's booming construction industry. Sources of readily available sand may run out within five to seven years, according to a report being prepared for Maui County. The vast system of sand dunes from Waihee to Waikapu has largely been covered by development, and what's left is being mined, the report says. Maui sand is in high demand because it's a key ingredient in concrete and the only material now available for beach restoration projects. About 318,000 tons of sand are dug...