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The two silos in the applicant's request would be 24 feet tall and 12 feet in diameter, and would be placed upon a single 16 by 32 foot concrete pad. The applicant has indicated that the silos would be painted with a high solid polyurethane enamel (semi-gloss finish)to match the exterior of the main building on the property. The silos are needed to store plastic resin pellets that would be used to supply their new extrusion laminator. The pellets would reach the inside of the building through 6-inch steel piping, which would connect the silos to the extrusion laminator. The piping would lead the pellets directly to the hopper located above the machine. While the maximum capacity of each silo would be 65,000 pounds (1,858 cubic feet), the silos are not expected to hold more than 48,000 thousand pounds of material at any one time. The applicant's request also includes a 10,000 gallon containment tank. The tank would be approximately 13 feet tall, 12 feet in diameter, and would be made of white plastic. A new storage room is being constructed within the building to hold multiple 55-gallon closed drums containing ink. The room is designed to be explosion-proof since the ink has potential to be flammable. According to the Fire Marshal, the external containment tank must be able to hold the contents of one of the drums if there was a spill. In the event of an accident, the ink would be pumped into the proposed containment tank on the exterior of the building. Additionally, in the event of a spilled barrel, the containment tank would also need to be able to hold 30 minutes worth of water runoff from the sprinkler system in order to suppress a fire or other hazard. The southeastern side of the building contains approximately 1.7 acres (73,000 square feet) of paved surfaces and is used for storage and loading. As the silos and tank would be built on top of existing impervious surface, no change in impervious coverage would occur with this application. The addition of the three structures is not expected to impact access traffic circulation. There would not be any reduction in parking, as all parking is on the other side of the building. All of the material would be contained within the silos, piping, laminator, and containment tank. The project is designed to protect the exterior from potential nuisances. The pipes as well as the silo tanks would be constructed with double walls. The applicant has submitted two letters addressing the details of the application, a site plan, and measurements of the proposed structures (Attachment A). Some of the plans for the silos and for the containment tank are presented separately, as the applicant is working with two different companies on these projects. Previous Planning Cases The property has been part of four other planning cases. In 1997, Planning Case 97-006 was approved, which was the original PUD for this property. Planning Cases 00-017 and 00-031 were approved in 2000. These planning cases included minor changes to the exterior of the City of Arden Hills Planning Commission Meeting for September 7, 2011 P:IPlanninglPlanning Cases12011 U1-019-Hood Packaging PUD Amendment(Pending)109-07-11-PC Report.docx Page 2 of 6