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Figure 1 shows the approximate location of the noise barrier. <br /> The barrier should be solid and durable without any air gaps and should break line of site from <br /> the chip and grind area to the nearest residential receptors to the east. Appropriate noise barrier <br /> material may include concrete panels, concrete block, pre-fabricated acoustical barriers, or <br /> earthen berms. Various other materials may also be used to achieve acoustical attenuation, but <br /> should be reviewed by a qualified noise control engineer. <br /> Conclusions <br /> Implementation of the above-described noise control design will reduce exterior noise levels at <br /> the nearest noise-sensitive residential uses and ensure compliance with the applicable San <br /> Joaquin County exterior noise level standards. Figure I shows the recommended noise control <br /> design. <br /> Noise barriers should be solid and durable without any air gaps and should break line of site <br /> from the chip and grind area to the nearest residential receptors to the east. Appropriate noise <br /> barrier material may include concrete panels, concrete block, pre-fabricated acoustical barriers, <br /> or earthen berms. Various other materials may also be used to achieve acoustical attenuation, <br /> but should be reviewed by a qualified noise control engineer. <br /> If you or the San Joaquin County staff have any questions, please contact me at (530) 823-0960 <br /> or Isaxelby@jcbrennanassoc.com. <br /> Respectfully submitted, <br /> j.c. brennan& associates, Inc. <br /> 444 <br /> Luke Saxelby, INCE <br /> Senior Consultant <br /> Member, Institute of Noise Control Engineering <br /> Page 3 of 3 <br />