The first four modules consist of six aisles with 37 ladders (vertical shelving sections) on each side of the aisle. Module 5 consists of 10 aisles with 42 ladders on each side. Module 8 consistes of 12 aisles with 42 ladders on each side. Module 9 currently is shelves with 6.5 aisles, with open space for racking out to 12 aisles. Each ladder incorporates 30-foot high adjustable shelving, the individual shelves measure 56 inches by 36 inches. Items are reached with a mechanical fork lift or "order picker" typical of warehouse operations. Guide rails around shelving provide for automatic steering of the order picker in Modules 1-5; Modules 8 and 9 use wire guided order pickers. The shelving vendor for modules 1-4 was Morgan Marshall of Chicago Heights, Illinois. Modules 5, 8 and 9 shelving was supplied by SpaceSaver of Fort Atkinson, Wisconsin. The Raymond order pickers were purchased from Arbor Material Handling, Inc. in Willow Grove, Pennsylvania.
The seven modules will collectively house approximately 17.5 million volumes or book volume equivalents. Items are sorted by size, both width and height and stored in trays made from acid-free cardboard to prevent deterioration of items. Trays are stored on appropriately-sized shelves to achieve the highest storage density. Trays are manufactured by Temple Inland Packaging Company, Binghamton, New York. ReCAP has 16 different size trays. Items at ReCAP are not arranged in call number order, but are shelved according to size. For book collections, this means each book's physical size dictates where it gets shelved, not its subject matter or author. All items must arrive at ReCAP barcoded, clean, and either in good condition or in an appropriate preservation container. Since access to items stored at ReCAP is exclusively through bar code identification, adequate records to identify items by other means must be created and maintained by and at the owning library.