1. (a) A generator shall position each container of hazardous waste so that its hazardous waste label or marking is not hidden by walls or other containers and can be easily read without having to move any containers.
2. (b) Hazardous waste containers shall be stored on impervious surfaces. Impervious surfaces shall include concrete and asphalt unless cracks or holes are present, and shall not include earthen, wooden, or gravel surfaces.
3. (c) Except as provided in (d), below, hazardous waste containers shall not be stored in an area with functional floor drains or manholes, or in or near a sink with a functional drain present, unless secondary containment is provided around all hazardous waste containers in the area capable of containing the volume of the largest capacity hazardous waste container present.

4. (d) The containment system required by (c), above, or by (e)(2), below, shall not be required for areas that store containers holding only wastes that do not contain free liquids provided that:

   1. (1) The area is sloped or is otherwise designed to drain and remove liquid resulting from precipitation; or
   2. (2) The containers are elevated or otherwise protected from contact with accumulated liquid.

5. (e) Hazardous waste containers stored outdoors shall:

   1. (1) Be covered to prevent precipitation from coming in contact with the tops of the containers except when being moved to another location;

   2. (2) Except as provided in (d), above, have secondary containment that:

      1. a. Is adequate to hold any spills or leaks at 110% of the volume of the largest container in the area or 10% of the total volume of containers, whichever is greater; and
      2. b. Is covered to keep the secondary containment structure free of rain, snow, and ice; and

   3. (3) Not be stored within any of the following distances, unless a greater distance is required by any other federal standard, state statute, or rule in which case such distance shall apply:

      1. a. For surface waters, 50 feet;
      2. b. For private wells, 75 feet;
      3. c. The sanitary protective area of any public water supply well; or
      4. d. For storm drains, 50 feet.

Source. #5053, eff 1-24-91; ss by #5886, eff 8-26-94; amd by #6384-B, eff 11-26-96; ss by #7333, eff 8-1-00; ss by #9215, INTERIM, eff 8-1-08; ss by #9367, eff 1-28-09; amd by #10205, eff 10-19-12; ss by #12347, eff 8-14-17 (formerly Env-Hw 507.01); ss by #14280, eff 8-1-25, EXPIRES: 8-1-35 (formerly Env-Hw 507.02(b)(2)-(g))