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20.52.030 structures which are housing, support- ing or containing sufficient quantities of toxic or explosive substances to be dangerous to the safety of the general public if released. C. "High risk building" is any build- ing, other than an essential or hazard- ous building, having an occupant load of one hundred (100) occupants or more as determined by section 1003.2.2 of the uniform building code, except that a high risk building shall not in- clude the following: 1. Any building having exterior walls braced with masonry cross walls or wood frame cross walls spaced less than forty feet (40') apart in each story. Cross walls shall be full story height with a minimum length of one and one- half (11/Z) times the story height. 2. Any building used for its intended purpose, as determined by the chief, for less than twenty (20) hours per week. D. "Minimum risk building" is any building, not classified as a high risk building or an essential or hazardous building, having an occupant load of twenty (20) occupants or more as deter- mined by section 1003.2.2 of the uni- form building code. E. "Low risk building" is any build- ing, other than an essential or hazard- ous building, having an occupant load of less than twenty (20) occupants as determined by section 1003.2.2 of the uniform building code. (Ord. 1778 § 11, 1999; Ord. 1669 § 11, 1995; Ord. 1563 § 1, 1992) 20.52.040 Owner Notification: The chief building official shall, within six (6) weeks of the effective date hereof, notify the owners of prop- erty improved with unreinforced ma- sonry buildings determined to be within the scope of this chapter that such owners are required to submit engineer- ing reports, building analysis, plans for the repairs and complete any necessary structural repairs within the time limits established by section 20.52.050 of this chapter. (Ord. 1869 § 14, 2002; Ord. 1563 § 1, 1992) 20.52.050 Mitigation Plan: A. Step 1: The property owner shall submit to the city within one year of the adoption of this chapter a structural engineering report. The purpose of this report is to establish, by required tests, the strength of the mortar material holding the bricks or hollow clay blocks together. Such tests will reveal if the walls have proper attachment to the roof system and, in the case of multistory buildings, that the floor systems are also properly attached to the wall system. The tests are to be completed by a licensed engi- neer or architect. A property owner with a building which does not have a proper wall to roof or wall to floor attachment must complete the attach- ment within two (2) years of the adop- tion of this chapter. B. Step 2: 1. If the property owner desires to reinforce the existing building, the property owner is to submit plans to the city's building and safety division and planning departments. The property owner shall complete the repairs based on the classifications (table A) within the time frame (table B) of this section (Pleasanton April 2003) 734-2