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• <br />B. Proposed structures must maintain a minimum 10 feet of <br />horizontal clearance to the base of the signal/crossing <br />gates. - <br />SPECIFICATIONS ADDENDUM <br />JULY 1995 <br />FOR DIRECTIONAL BORE INSTALLATIONS: <br />1. 10 foot minimum cover from top of the tie (beneath track <br />structures) to top of bored pipe. <br />2. 4 foot minimum cover from ground level to top of bored <br />pipe when outside of track structures. <br />Last revised November 14, 1995 <br />6 <br />