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Projecl No. D-3885-06 Christ Our Savior Catholic Parish It may be possible to combine different methods to provide a suitable foundation for the imposed loads eg. using a technique of surface stabilization combined with stabilized cement columns or pressure grout for support of loads. Alternatively, reinforced stone columns can be used that not only transfers loads to the lower and stronger layer rather receives lateral support from the weak soil along the way. Stone columns are generally provided by the specialized contractors and this may not be an option to be chosen because the cost involved during construction may be high. Pressure compaction grouting will be the most practical option in this case by providing pressure grout to a certain depth. The more detail descriptions are as follows: Ground improvement progam e.g. compaction grouting can be performed for the stabilization ofthe subgrade soil from 25 feet to 5 feet below the existing ground (25 feet ofsoft silty and clayey with peat layers). Compaction grouting should be performed under continuous observation by the representative of Geotechnical Solutions, Inc. This ground improvement technique improves the strength and/or stiffness of the ground by slow and controlled injection of a low-mobility grout. The process displaces and compacts this soil as grout mass expands. Specialty contractor (e.g. Hayward Baker etc.) may be selected to perform compaction grouting on design built basis. Preliminary Design Recommendation for Grouting Primary compaction grouting can be performed at l0-feet horizontal distance center to center and from depth of25-feet up to 5-feet below existing ground surface. Grout Mix Grout mix should consist of Portland Cement (Type V), sand (with percent passing #200 sieve between l0 and 30) and water and utilize '|Yo cemenl by weight of dry sand. 29 lt E I T I T I I I I T T I E E u I T E