Specifications include, but are not limited to: furnishing and installing modular block wall units to the lines, grades, and typical sections determined by the Engineer and as specified herein. Work shall include preparing the foundation soil, furnishing and installing leveling pad, unit fill, geogrid reinforcement and backfill. Retaining-walls shall be Keystone Standard Straight Retaining Wall System or approved equal. Color of units shall be approved by the Engineer. Slab Raising: A. Materials 1. Cement Slurry Mixture: The slurry mixture used for raising concrete slabs shall be composed of lime, sand, ground clay, Portland Cement (Type 1A conforming to A.S.T.M. C150), and fly ash in the following proportions by volume: Lime / Fly Ash Mixture passing #50 sieve 100% 27% Sand passing #4 sieve 100% 15% Ground clay passing #4 sieve 100% 50% Portland Cement – 3 ½ bag mix (approx.) 8% This shall be accomplished by use of continuous mixer. All aggregate shall be metered for precise mix design to assure consistent quality control. 2. All materials for job site shall at all times be mobile and not stored in the road or walk area