Execution of Scope of Work

3.1 CONCRETE REPAIR

1. Chip out concrete until sound concrete is reached.
2. Pressure wash after excavations to remove dust, laitance, and other bond inhibiting materials, SSD (saturated surface-dry) substrate.
3. Apply two (2) 10-mil coats (total 20-mil coating) of CR246 STO bonding and anti-corrosion agent onto the prepared steel and one (1) 20-mil coat to SSD concrete surface to insure protection of steel and proper bond of repair material.
4. Fill prepared area with appropriate STO Repair Mortar. Consolidate, finish and cure as required.
5. Protect outers surface with bonding agent and stucco product (Refer to attachment of STO Products, detail no. R1.1.3).
6. Repair stucco as needed.

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3.2 REPAIRING/REPLACING STEEL COLUMNS

1. Structural steel shall conform to ANSI/AISC 360-16, except tubular steel columns, which are to be constructed to 46 k.s.i. yield strength. All bolts shall be A325 bolts unless otherwise noted. Welds shall be performed with a E70xx electrode.
2. Locking pin jack shoring post that has adjustable height range of 120" to 216" capable of 9,300lbs to 2,700lbs in respect to the adjusted height should be installed before repair work.
3. Clean at the bottom of steel columns and base plates.
4. Cut out the corroded length of the steel column from the bottom, remove corroded base plate and fasteners. If corroded portion of steel columns exceeds 25% of its length, then it must be completely replaced with a new column.
5. Repair concrete slab/footing.
6. Install new base plates, column section/column and then install fasteners to anchor base plate onto concrete.

3.3 WOOD MEMBERS AROUND STEEL COLUMNS

1. Remove and replace all damaged wood members around steel columns after columns have been repaired/replaced and coated.
2. Use nails as per GC’s recommendation to attach and secure wood members around columns.

3.4 PROTECTING AND COATING

1. Provide durable protection coating on all external wooden structural members (columns and beams) to original condition.
2. Provide durable protection coating on all steel members in residential buildings and carports.
3. Provide durable protection coating on all repaired concrete sections and stucco.
4. Use sealant as per GC’s recommendation to fill in all cracks on beams, ceilings, columns and
   slabs inside residential units.
5. Clean all contaminants generated by repair work from building and surrounding areas, including corroded steel, concrete, adhesives, sealants, and coatings

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