Specifications include, but are not limited to: a. Freely draining soils and granular materials cleaned of all debris, roots, branches, stones in excess of 20 mm diameter and other deleterious materials; including soil contaminated with calcium chloride, toxic materials, and petroleum products; b. Approximate Organic Content: 30% by total mixed volume; c. Granular content smaller than 20 mm – larger than 0.075 mm: 70% by volume (less than 5% fines by mass); d. Total fines of mixed bag medium: less than 8% by mass; e. Percolations shall be such that no standing water is visible 60 minutes after at least 10 minutes of moderate heavy rain or irrigation. • Height of retained soil • Lateral earth pressures • Slope of the retained face • Slope of soils above the system • Slope of soils below the system • Surcharge loading • Hydrostatic loading • Site drainage and run off patterns • Anticipated settlement • Backfill requirements