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Tegre Corporation <br /> Job No. 3124JS057 <br /> TABLE 4 <br /> TEMPORARY EXCAVATIONS CLOSE TO IMPROVEMENTS; <br /> SHORT-TERM CONDITION; F.S. =2.0 <br /> Excavation Maximum Slope Inclination Maximum Slope Inclination <br /> Depth (Granular Profile) (Clay/Granular Profile) <br /> 20 feet 2H:1V 1H:1V <br /> 40 feet 2H:1V 1H:1V <br /> 60 feet 2.5H:1V 2H:1V <br /> 80 feet 2.5H:1V 2.5H:1V <br /> The stability of permanent excavation slopes and embankments was analyzed for the long- <br /> term condition. A minimum factor of safety of 2.0 is recommended for long-term <br /> excavations. The factor of safety for the long-term condition will be a function of the soil <br /> conditions and the excavation depth. A summary of the stability analysis for the long-term <br /> condition is presented in the following table. The results of the stability analysis are <br /> presented on Figures C-17 through C-24 in Appendix C. <br /> TABLE 5 <br /> LONG-TERM EXCAVATIONS; F.S. = 2.0 <br /> Excavation Maximum Slope Inclination Maximum Slope Inclination <br /> Depth (Granular Profile) (Clay/Granular Profile) <br /> Clay Layer 4H:1V <br /> 20 feet 2H:1V <br /> Granular Layer N/A <br /> Clay Layer 4.5H:1V <br /> 40 feet 2H:1V <br /> Granular Layer 2H:1V <br /> 60 feet 2.5H:1V Clay Layer 4.5H:1V <br /> Granular Layer 3H:1V <br /> Clay Layer 4.5H:1V <br /> 80 feet 2.5H:1V <br /> Granular Layer 3H:1V <br /> 6.5 Stability Analysis—Off-Site Areas <br /> The proposed gravel pit is located in a rural area and is surrounded by vacant undeveloped <br /> land. In addition, properties in the surrounding area are generally vacant or used for <br /> agricultural purposes. The only improvement in the area is an oil well, located <br /> approximately 200 to 250 feet north of the northwest property corner. There are currently <br /> no other improvements in the area of the gravel pit. <br /> 9 <br />