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1 <br />Six -foot block walls should be constructed at second line <br />receptor residential lots thht exceed the 67 Leq federal <br />standard (see the Appendix) to reduce exterior noise to <br />acceptable levels. <br />7. Six -foot block walls could be constructed at second line <br />receptor residential lots that approach the 67 Leq federal <br />■ standard, to reduce exterior noise levels. <br />1: <br />750 -487 <br />