22.408.170.B

Noise

• Construction Noise Mitigation Plan required

  Prior to the issuance of a grading permit for a Project, the Applicant shall provide proof satisfactory to Public Works that all construction contractors have been required in writing to comply with Section 22.408.170.A, above. The contractor or Applicant shall prepare a Construction Noise Mitigation Plan.

• Maximum L50 noise level (7am-7pm)50 dBA

  From 7:00 a.m. to 7:00 p.m. the allowable noise level shall not exceed the greater of (i) a L 50 of 50 dBA or (ii) ambient

• Maximum L75 noise level (7pm-1am)47 dBA

  From 7:00 p.m. to 1:00 a.m. the allowable noise level shall not exceed the greater of (i) a L 75 of 47 dBA or (ii) ambient

• Maximum L90 noise level (1am-7am)44 dBA

  From 1:00 a.m. to 7:00 a.m. the allowable noise level shall not exceed the greater of (i) a L 90 of 44 dBA or (ii) ambient

• Maximum Lmax noise level (7am-10pm)67 dBA

  From 7:00 a.m. to 10:00 p.m. the L 0 (otherwise known as the L max) shall not exceed the greater of (i) 67 dBA or (ii) ambient

• Maximum Lmax noise level (10pm-7am)65 dBA

  From 10:00 p.m. to 7:00 a.m. the L 0 shall not exceed the greater of (i) 65 dBA or (ii) ambient

• Maximum Lmax noise level for pure tone/impulsive (7am-10pm)62 dBA

  For sound sources that emit a pure tone or impulsive noise (e.g. gunshot) from 7:00 a.m. to 10:00 p.m., the L 0 shall not exceed the greater of (i) 62 dBA or (ii) ambient

• Maximum Lmax noise level for pure tone/impulsive (10pm-7am)60 dBA

  For sound sources that emit a pure tone or impulsive noise (e.g. gunshot) from 10:00 p.m. to 7:00 a.m., the L 0 shall not exceed the greater of (i) 60 dBA or (ii) ambient