Design of a containment area surrounding the FOG processing area 2. Site drain to Cul-de-sac drain Through our discussions with City staff, we have developed the following understanding of the requested modifications to our Scope of Work. Additional Task Item 1 - FOG Containment Facilities AECOM will provide construction plans and specifications for a containment wall surrounding the FOG processing area. Preliminary estimates indicate a concrete wall (25' x 25' x 3' high) will be required to contain 150% of the volume of the FOG storage tank. The design will include stairs with a handrail to access the containment area, and the containment area will feature concrete flatwork within the entire contained area.