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<br />I <br /> Specification <br />I Page or Draw- <br />ing No. <br />I Dwg. 4 <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Cutoff collars are shown throughout the upstream Zone 2 and <br /> <br />3 areas. Unless these materials are controlled to insure <br /> <br />impervious fill, the collars outside Zone 1 are ineffective. <br /> <br />Three well constructed collars, 2 upstream and 1 downstream <br /> <br />of the gate chamber are recommended. <br />