Subsection R404.1.1 of the International Residential Code for One- and Two-Family Dwellings is hereby amended and shall read as follows:

R404.1.1 Design required. A design in accordance with accepted engineering practice shall be provided for concrete or masonry foundation walls when any of the conditions listed below exist:

1. Walls are subject to hydrostatic pressure from ground water.

2. Walls supporting more than 48 inches (48") of unbalanced backfill that do not have permanent lateral support at the top and bottom.

3. Sites containing CH, MH, OL, or OH soils as identified in Table R405.1.

4. Foundation walls exceeding ten feet (10') in height, measured from the top of the wall to the bottom of the slab.

5. Lots identified on the subdivision grading plan as having more than six feet (6') of fill or having a finished slope steeper than 4 horizontal to 1 vertical before grading.

6. Footings and foundations with existing fill soils below the footing level.

7. Sloping lots steeper than 4 to 1 before grading.

8. Lots where some footings will bear on soil and others will bear on rock.

9. Areas where problems have historically occurred.

10. Stepped footing and foundation walls.