In response to Columbus and Franklin County excluding the casino site from its sewer contract, Penn National Gaming officials may be thinking of alternate ways of disposing of its sewage. A mystery client approached the city of Marysville about whether its sewage treatment plant could handle 120,000 gallons of sewage a day. Local waste haulers indicated this would be a rather daunting task, requiring around the clock hauling at an estimated cost of over $300,000 a year.