(a) All streams or other bodies of water which appear as lines to indicate natural waters on the reference maps herein, and which are not specifically designated in table I, shall be assigned the same classes and standards of quality and purity as the specifically designated waters to which they are directly tributary.

(b) All streams or other bodies of water which are not shown on the reference maps herein shall be assigned to class D, as set forth in Part 701, supra, except that any continuous flowing natural stream which is not shown on the reference maps shall have the same classification and assigned standards as the waters to which it is directly tributary.

(c) Notwithstanding the items indicated in table I and the aforementioned special conditions statements which, in some instances, may indicate assignment of classifications for waters contained within the boundaries of the State-owned forest preserve lands and, therefore, controlled under the provisions of the State Constitution and the Environmental Conservation Law, such waters are hereby excluded from the boundaries of the State-owned forest preserve lands. All waters within 100 feet of the boundaries of the State-owned forest preserve lands are hereby assigned to class A with standards of quality and purity for class A.