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Subsidence In��estigation SDIl Project Number:3023547 Quiros-Marti;nez Residence-Zephyrhills, Florida Normally ac�;epted construction tolerance for the "levelness" of conerete floor slabs is 1 inch in 20 feet. Thi:� translates to approximately 1/4 inch in 5 feet. SDII recommends that a floor slab elevation ma:p be created if initial site data indicates a slope in excess of 1/4 inch in 5 feet. The resultin��;map is not prepared by a licensed surveyor and is not to be considered as a survey as regulated by §472 Florida Statutes. There is no standard method for floor elevation map preparation. Soil Classifi�c;ation All fonnal clescriptions of soil ty.pes, colors, compositions, textures, and other properties are completed ir� SDII's soils laboratory. The classification process follows ASTM methods and utilizes Unified Soil Ciassification System (USCS) notation. SDI1 includes both geologic and USCS descriptions in its soil characterization in order to assist in determination of the origin of each soil typ��and geologic material and determine the engineering properties of the soil. For visually�;lassified soils,ASTM Method D2488 is utilized. Method D2487 is utilized for soils that have beer�subject to Atterberg Limits and gradation(grain size)analysis. Particle Size Analysis (Gradation Analysis) Particle size ,.inalyses are performed in SDII's soils laboratory. The simplest method used is wash gradation usiing the 200-mesh U.S. Standard Sieve. This separates the particles coarser than 0.075 mm fr�am the finer materials. The proportion of the soil fraction finer than the 200-mesh screen (-200 fraction) is utilized in the USCS soil classification system. For a full grain size or gradation curWe of sand-sized materials, the dried sandy soil is passed through a nest of sieves. If grain size data are needed on fine sand, silt, and clay fractions, the hydrometer method is uti 1 ized. Appropriate ;�rain size or gradation data are obtained by use of ASTM Method D422. The -200 fraction is determined according to ASTM Method D140. Moisture Co.ntent,Organic,and Ash Content For determin,ation of the moisture content of a soil, the soil sarnple is oven dried, and the weight loss is attribu�ed to the mass of moisture lost from the sample. The moisture content is calculated by dividing t',rie weight of water in the sample by the dry weight of the soil and then multiplying by 100 to ob�tain a percentage. The organic and ash contents are determined by loss of weight upon destruction of the organic material in a furnace. The organic content is the percentage of mass of the c;lried sample lost upon destruction, and the percent ash is the weight of dry solids after organic destruction divided by the dry weight of the sample with organics included. This measurement is also expressed as a percentage. The percenta�ges of moisture, organics, and ash are determined according to ASTM Method D2974. AST]�✓I Method 2216 also governs moisture content measurements.