ATCP 33.30(1)(1) Except as provided in s. ATCP 33.32 (8) or (9) or s. ATCP 33.34 (6), all handling of bulk fertilizer or bulk pesticide at a storage facility shall be conducted over a mixing and loading pad.

ATCP 33.30(2)(2) A mixing and loading pad shall be constructed and maintained to catch, contain and allow recovery of reasonably foreseeable discharges that may result from the handling of the bulk fertilizer or pesticide.

ATCP 33.32ATCP 33.32 Mixing and loading pad for liquid products. Except as provided in sub. (8) or (9), a mixing and loading pad used for liquid fertilizer or pesticide shall comply with all of the following:

ATCP 33.32(1)(1) Pump containment. A mixing and loading pad shall extend beneath any pump that the operator uses to transfer liquid fertilizer or pesticide, unless the pump is located within a secondary containment structure that complies with s. ATCP 33.42.

ATCP 33.32(2)(2) Appurtenance containment. A mixing and loading pad shall extend beneath any appurtenance or plumbing connection through which the operator transfers liquid fertilizer or pesticide, unless one of the following applies:

ATCP 33.32(2)(a)(a) The appurtenance or connection is located within a secondary containment structure that complies with s. ATCP 33.42.

ATCP 33.32(3)(3) Design, construction and maintenance; general. A mixing and loading pad shall comply with all of the following requirements:

ATCP 33.32(3)(f)(f) It shall be designed, constructed and maintained to withstand all foreseeable load conditions, including the filled weight of all vehicles, storage containers, appurtenances, pumps and equipment that may be used or located within it.

ATCP 33.32(3)(h)(h) It may not have any precipitation drain through which spilled fertilizer or pesticide could be discharged. Any precipitation drain that exists on November 1, 2006 shall be permanently sealed within 6 months after that date.

ATCP 33.32(4)(4) Capacity. The capacity of a mixing and loading pad under this section, including the capacity of any sump to which the mixing and loading pad drains, shall be at least 1,000 gallons or 125 percent of the capacity of the largest storage container loaded or unloaded at the storage facility, whichever is less. This subsection does not apply to a mixing and loading pad that was in use prior to November 1, 2006 and complies with capacity requirements that were in effect at that time, unless the operator substantially alters the mixing and loading pad.

ATCP 33.32(5)(5) Construction materials. A mixing and loading pad shall be constructed of portland cement concrete. A portland cement concrete mixing and loading pad constructed on or after November 1, 2006 shall meet the standards specified in chapters 5 and 6 of the Wisconsin Minimum Design and Construction Standards for Concrete Mixing and Loading Pads and Secondary Containment Structures (February 2005).

ATCP 33.32 NoteNote: The Wisconsin Minimum Design and Construction Standards for Concrete Mixing and Loading Pads and Secondary Containment Structures (February 2005) were written by Professor David W. Kammel of the department of biological systems engineering, University of Wisconsin-Extension. Copies are on file with the department and the legislative reference bureau. Copies are available from the department, at no charge, at the following address:

ATCP 33.32(6)(6) Construction inspection. If a concrete mixing and loading pad is constructed on or after November 1, 2006, the operator or a person chosen by the operator shall inspect the construction for conformity to the design specifications filed with the department under s. ATCP 33.10 (1). The person conducting the inspection shall inspect and approve the construction of the soil sub-base, the laying of structural steel, and the laying of waterstop materials and devices before concrete is poured. The operator shall provide a copy of the inspection report and approval to the department.