7 Del. Admin. Code § 1149-6.0
Current through Register Vol. 28, No. 1, July 1, 2024
Section 1149-6.0 - Maximum Noise and Vibration Limits6.1 No person(s) shall operate or cause to be operated any stationary source of sound in such a manner as to create a 24-hour equivalent A-weighted sound level which exceeds the Leg limits set forth for the receiving land use category in Table 1 when measured at the point of complaint origination within the property boundary of the receiving land use. Any exceedence of these values shall constitute a noise disturbance. Table 1 Sound Levels by Receiving Land Use Zones, L,a (24) dBA
| Emitter(s) | Receptor C | Receptor B | Receptor A 7 a.m. - 10 p.m. | Receptor A 10 p.m. - 7 a.m. |
| A | 65 | 65 | 65 . | 55 |
| B | 75 | 75 | 65 | 55 |
| C | 85 | 75 | 65 | 55 |
6.2 INTRUSIVE NOISE LEVEL 6.2.1 NOT WITHSTANOING THE PROVISIONS OF SECTION 6.1, A SOURCE SHALL BE CONSIDERED TO CAUSE A NOISE DISTURBANCE IF THE SOUND LEVEL, OTHER THAN AN IMPULSE, INFRASONIC OR ULTRASONIC SOUND, EMITTED BY SUCH SOURCE EXCEEDS THE AMBIENT NOISE LEVEL BY 10 dBA WHEN MEASURED AT THE POINT OF COMPLAINT ORIGINATION WITHIN THE RECEIVING PROPERTY. Note: The relative intrusiveness of sound depends upon its amplitude, duration, frequency, time of occurrence and tonal or informational content as well as the prevailing ambient noise level. A sound pressure level of 3 dB(A) above the ambient level is normally just discernable, with levels of 5 dB(A) to 10 dB(A) the lower level region for complaints.
6.3 Correction for Character of Sound 6.3.1 For any stationary source of sound which emits a pure tone, cyclically varying sound or repetitive impulse sound, the limits set forth in Section 6.0 herein shall be reduced by 5 dBA.6.4 Impulse Peak Limit 6.4.1 For any source of sound which emits an impulse (duration less than one second with an abrupt onset and rapid decay) including metal to metal impacts or exploding impacts, shall not exceed the peak levels set forth below when measured at the point of complaint origination within the receiving property. | Class A Zone Nightime | 80 dB 100 dB |
| Anytime Any Zone except the above |
6.5 Infrasonic and Ultrasonic Peak Limit 6.5.1 For any source of sound which emits infrasound (below 16 Hertz) or ultrasound (above 20 kHz) frequencies, the sound pressure level shall not exceed 100 dB when measured at the point of complaint origination within the receiving property.6.6 Maximum Permissible Vibration Levels 6.6.1 No person shall operate or cause to be operated any single vibration source or combination of sources in such a manner as to cause vibration levels in excess of those set forth below as measured at the point of complaint origination within the boundary of the receiving property. 6.6.1.1 Class A Zone Stationary Source ---Velocity of 0.15 inch per second6.6.1.2 Class A Zone Temporary or Mobile Source ---Velocity of 0.7 inch per second6.6.1.3 Class B Zone ---Velocity of 0.7 inch per second6.6.1.4 Any Zone under any condition ---Velocity of 3 inches per second (Caution level for structure damage)7 Del. Admin. Code § 1149-6.0