A natural gas drilling boom in Fort Worth is bringing with it hopes of wealth, and fears of pitfalls. FORT WORTH, Oct. 20 — Boston had the Big Dig. Now Fort Worth has the big drill. Three years ago, Lawrence B. Dale, president of a small drilling company, began leasing about 90 sites around Fort Worth for natural gas wells. Under golf courses, schools, parks, libraries, airports and dozens of neighborhoods, some of the nation’s leading independent energy companies are scouring the city in search of the best locations to recover one of the largest concentrations of natural gas in...