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iii) alignment did not match previous drawing and survey of culvert and <br />pond azea unless a declination angle of approximately 4° was used <br />B) Volume calculation <br />I) elevations at survey points calculated from bench mazk using Microsoft <br />Excel° spreadsheet (See Table 1 for results) <br />2) survey points drawn into AutoCad© <br />3) QuickSurf utility used to model the surface of the retentioq facility and <br />calculate volumes at various elevations (see Table 2) using 8 grid method <br />CONCLUSIONS <br />The retention facility constructed at the San Luis Mine by BMRI meets or exceedsiall the specified <br />design criteria. The total retention volume before outflow would occur from the facility is in excess <br />of40,000 gallons. <br />