RICHMOND, Virginia  — Packaging Corporation of America (PCA) is shutting its converting plant in Richmond, Virginia, resulting in the loss of 110 jobs, effective June. In a Worker Adjustment and Retraining Notification (WARN) filing, the Illinois-based containerboard producer said it will coordinate with state and local authorities in Virginia on support for employees who lose their jobs. The company also said it will assist workers interested in relocating to other PCA sites. Mark Romaniuk, deputy general counsel at the company, described the move as “a difficult business decision.” …PCA also referenced a satellite warehouse in North Chesterfield, Virginia, which employs six people. …The decision to close the Richmond plant follows downsizing in Washington state. …The closures affected 168 jobs – 60 in Allentown and 108 in Salisbury.