Groton has been trying in vain to meet state racial balance requirements for its schools since 2000, but now city leaders have a new idea: build one giant middle school. The effort - known as the Groton 2020 plan - comes with a price-tag of $191.7 million. With up to 80 percent of construction costs being paid for by the state, the Groton 2020 plan is a prime example of how court-imposed racial balance guidelines are forcing districts to build new schools and costing towns and the state millions. Yet, despite the money spent many remain dissatisfied with the results.