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ARDEN HILLS PLANNING COMMISSION – SEPTEMBER 7, 2011 2 Community Development Intern Mei-Ling Anderson stated the applicant has requested Planned Unit Amendment to install two double-walled silos and one containment tank to the southeast side of the building at 1887 Gateway Boulevard. Community Development Intern Mei-Ling Anderson reviewed Hood Packaging Corporation is a national company that manufactures various types of paper and plastic packaging products. The company is a conforming use in the G-B Zone. There are currently four storage tanks on the property that were built following the approval of two previous planning cases. This request would add one containment tank and two silos to the southeastern side of the property. The containment tank would be located between the proposed silos and the building. There would be a distance of 4 feet between the containment tank and the concrete pad on which the silos would sit. Community Development Intern Mei-Ling Anderson stated the two silos in the applicant’s request would be 24 feet tall and 12 foot 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 pounds of material at any one time. Community Development Intern Mei-Ling Anderson stated 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. Community Development Intern Mei-Ling Anderson reviewed 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. The applicant has submitted two letters addressing the details of the application, a site plan, and measurements of the proposed structures. 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.