Richardson is pushing an effort to encourage citizens to go paperless using their utility bills as more than one-fifth of Richardson residents still obtain a paper water bill every month. That equals 250,000 envelopes which are published, mailed and sent each year, according to the city’s “Go Paperless” campaign.The quantity of paper necessary to make the invoices piles sky high and kilometers long.For instance, the tallest building in Dallas, the Bank of America Plaza building, reaches 921 feet to the atmosphere. If a year of Richardson’s water bills had been piled on top of another, the newspaper could achieve 16 ft greater in 937 feet.If the water invoice envelopes were laid off horizontally, they’d length 37.5 miles. The space is long enough to cover the distance of this Dart Silver Line project that joins Richardson into DFW Airport. And there could be sufficient envelopes left to pay almost 12 more miles past the airport, according to the city’s calculations.The figures were mentioned as a member of Richardson’s Go Paperless effort, which urges citizens to get their invoices electronically rather than through the email.