2016-11-02_PERMIT FILE - C1982057A

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section and set forth in Attachment 13-11, Stock Tank Typical Designs. Stock tank T-18 was constructed in 1998, T-20 in 2001, and T-5 in 2004. These stock tanks were constructed under the supervision of Roy Karo (SCC) and were constructed and have been maintained in accordance with the methodology presented above and set forth in Attachment 13-11, Stock Tank Typical Design. In lieu of a certified design inspection report for each of the existing stock tanks, SCC presents the following discussion as a statement of compliance with Rule 4.05.9(14) and 4.05.9(15)(a) through (e) for the existing stock tanks. (a) All stock tanks are inspected frequently for any appearance of erosion, instability, structural weakness or other hazardous conditions. The stock ponds are located so that there are no potential safety hazard to downstream structures; therefore, if a failure did occur, there would be minimal or no risk to human health and safety or property. (b) All stock tanks are inspected at least annually and future stock tank structures will be inspected regularly during construction. (c) The depth and elevation of impounded waters are recorded during the annual inspections. (d) Future stock tanks will be surveyed when constructed to ensure the storage capacity is within allowable limits. (e) Inspections will record the need for maintenance, if required. Certified As-Built drawings for the existing stock tanks are included in the permit application package as: • Exhibit 13-27.T1 • Exhibit 13-27.T2 • Exhibit 13-27.T3 • Exhibit 13-27.T5 • Exhibit 13-27.T18 • Exhibit 13-27.T20 • Exhibit 13-27.T22 • Exhibit 13-27.T24 The results of the annual inspections for the existing (and future) stock tanks will be included in the annual pond inspection report and will comply with items (a) through (e) of Rule 4.05.9(15). Stock Tank Stability. A generic stability analysis was completed to assess the stability of the embankments forming the stock tanks. Instead of completing an analysis for each potential pond, a worst case scenario has been evaluated. If the worst case scenario proved to be stable, then the other embankments with lesser height and shallower slopes would be stable. A force limit equilibrium stability analysis was completed using the SLOPEW software package. A Morgenstern Price analysis was used in conjunction with a search routine to estimate the lowest safety PR-05 10 Revised 01/06