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3515 Navy Dr . , Stockton, CA <br /> Piping Sampling Angle Calculations <br /> Trench Bottom at 2 feet, Sample at 4 Feet <br /> Tangent 30 degrees= Opposite/Adjacent <br /> Tangent 30 degrees X Adjacent= Opposite <br /> 0 . 577 X 2 feet = 1 . 15 feet ( location of the trench edge horizontally from boring origin point and <br /> minimum starting distance from trench ) <br /> 0 . 577 x 4 feet = 2 . 31 feet ( location of the 4' sample horizontally from boring origin point ) <br /> Secant 30 degrees= Hypotenuse/Adjacent <br /> Secant 30 degrees X Adjacent = Hypotenuse <br /> 1 . 15 X 2 feet = 2 . 31 feet ( location of the edge of the trench diagonally from boring origin point ) <br /> 1 . 15 x 4 feet = 4 . 62 feet ( location of the 4 sample diagonally from boring origin point ) <br /> Trench Bottom at 3 feet, Sample at 5 Feet <br /> Tangent 30 degrees= Opposite/Adjacent <br /> Tangent 30 degrees X Adjacent= Opposite <br /> 0 . 577 X 3 feet = 1 . 73 feet ( location of the trench edge horizontally from boring origin point and <br /> minimum starting distance from trench ) <br /> 0 . 577 x 5 feet = 2 . 89 feet ( location of the 5 ' sample horizontally from boring origin point ) <br /> Secant 30 degrees= Hypotenuse/Adjacent <br /> Secant 30 degrees X Adjacent = Hypotenuse <br /> 1 . 15 X 3 feet = 3 . 46 feet ( location of the edge of the trench diagonally from boring origin point ) <br /> 1 . 15 x 5 feet = 5 . 77 feet ( location of the 5 foot sample diagonally from boring origin point ) <br />