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3515 Navy Dr . , Stockton , CA Piping Sampling Angle Calculations Trench Bottom at 4 feet, Sample at 6 Feet Tangent 30 degrees= Opposite/Adjacent Tangent 30 degrees X Adjacent= Opposite 0 . 577 X 4 feet = 2 . 31 feet ( location of the trench edge horizontally from boring origin point and minimum starting distance from trench ) 0 . 577 x 6 feet = 3 . 46 feet ( location of the 6' sample horizontally from boring origin point) Secant 30 degrees= Hypotenuse/Adjacent Secant 30 degrees X Adjacent = Hypotenuse 1 . 15 X 4 feet = 4 . 62 feet ( location of the edge of the trench diagonally from boring origin point ) 1 . 15 x 6 feet = 6 . 93 feet ( location of the 6 foot sample diagonally from boring origin point ) Trench Bottom at 5 feet, Sample at 7 Feet, Boring Location Tangent 30 degrees= Opposite/Adjacent Tangent 30 degrees X Adjacent= Opposite 0 . 577 X 5 feet = 2 . 89 feet ( location of the trench edge horizontally from boring origin point and minimum starting distance from trench ) 0 . 577 x 7 feet = 4 . 04 feet ( location of the 7' sample horizontally from boring origin point ) Secant 30 degrees= Hypotenuse/Adjacent Secant 30 degrees X Adjacent = Hypotenuse 1 . 15 X 5 feet = 5 . 77 feet ( location of the edge of the trench diagonally from boring origin point ) 1 . 15 x 7 feet = 8 . 08 feet ( location of the 7 foot sample diagonally from boring origin point ) Assumption : The top of piping in the trench is reported to range from 1 . 5 to 4 . 5 feet to allow for gravity drainage . It is assumed the trench is similarly sloped from approximately 2 to 5 feet . It is possible that the trench may be 5 feet throughout . If so then only the last set of calculations should be used . Recommendations : 1 . Round horizontal distance to the trench up to the nearest whole integer for a safety margin . 2 . If the trench is encountered start over using the next set of calculations . ie use the 5 foot sample calcs rather than the 4 foot sampled calcs . I