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6. Six -foot block walls should be constructed at second line <br />receptor residential lots that exceed the 67 Leq federal <br />standard (see the Appendix) to reduce exterior noise to <br />acceptable levels. <br />7. Six -foot 'Mock 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 />4 -27 <br />