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Subsidence lnvt;stigation SDII Project Number•3023547 Quiros-Martir�ez Residence-Zephyrhills,Florida Evidence of sinkhole activity was identified at the site, including: (1) the systematic pattern of declining N �ralues through clay-rich soils overlying limestone in SPT borings B-] and B-2; (2) multiple feet �f weight-of-rod/hammer strength materials overlying limestone in SPT borings B- 1 and B-2; and (3) the rapid losses of drilling fluid circulation above the limestone in SPT borings B-1 a�nd B-2. 2.4 Labo�ratory Soil Analysis Laboratory arialyses of soils are used to determine the suitability of the soil for construction and load bearing ,:�s well as for quality-control purposes. The analytical methods for laboratory tests included in th is investigation are summarized in Appendix A. Results from the tests are provided in Appendix 1=). Particle size �inalyses were perfonned on soil samples collected from hand auger borings HA-1 and HA-4 an�� SPT boring B-2 (Figure 4) for quality control purposes. The laboratory data indicated that the samples were poorly graded sand (SP) with approximately 3 percent fines content, poorl;y graded sand with silt (SP-SM) with approximately 7 percent fines content, and clayey sand (�SC) with approximately 14 to 23 percent fines content. The clay- or silt-sized fractions were not present in quantities sufficient to indicate a concern for soil suitability. 2.5 Geolo�;ic and Geotechnical Evaluation Summary The SPT data indicate that sinkhole activity, as defined by §627.706 Florida Statutes, exists at the site. Evicience of sinkhole aciivity was identified at the site, including: (1) the systematic pattern of decl ining N values through clay-rich soils overlying limestone in SPT borings B-1 and B-2; (2) multi.ple feet of weight-of-rod/hammer strength materials overlying limestone in SPT borings B-] a��.d B-2; and (3)the rapid losses of drilling fluid circulation above the limestone in SPT borings B-1 and B-2. 2-3