An engineering firm has developed a plan for modeling Oconee County’s sewer system, but not all of the county is ready for the modeling. The firm of Montgomery, Watson and Harza unveiled a four phase plan with a price tag of $400,000. Officials with the county and the sewer authority believe a computerized modeling system is needed to analyze the sewer system and the potential for new sewer customers. But executive director of the Oconee Joint Regional Sewer Authority Bob Winchester says the sewer authority and Seneca are ready for modeling but Walhalla & Westminster are not. According to Winchester, more GPS data is needed to prepare the modeling lines. However, Winchester says the sewer authority and Seneca can proceed with the modeling while Walhalla and Westminster prepare for the modeling.