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17.74.010 Intent.
   The purpose of these regulations is to prevent land or buildings, including permitted uses or conditional uses, from being used or occupied in any manner so as to create any dangerous, injurious, noxious and otherwise objectionable or hazardous condition; noise or vibration; smoke, dust, odor or other form of air pollution; electrical or other disturbance; glare or heat, liquid or solid refuse or wastes or other substance, condition or elements (all referred to in this Chapter as "dangerous or objectionable elements"), in a manner or amount as to adversely affect surrounding areas. Any permitted or conditional uses listed under Chapters 17.08 through 17.34 may be undertaken and maintained if they conform to all district regulations, and specifically if they conform to the limitations set forth in Sections 17.74.020 through 17.74.100 in this Chapter.
(Ord. 823-2016 § 25 (part), 2016)
17.74.020 Vibration.
   No vibration shall be produced which is transmitted through the ground and is discernible without the aid of instruments at or beyond the lot line nor shall any vibration produced exceed 0.0029 peak measured at or beyond the lot line using either seismic or electronic vibration measuring equipment.
(Ord. 823-2016 § 25 (part), 2016)
17.74.030 Noise.
   A.   All noise shall be muffled so as not to be objectionable due to intermittence, beat frequency or shrillness. In no event shall the sound-pressure level of noise radiated continuously from a structure exceed at the lot line the values in Table 1 of this section. The sound level shall be measured with a sound level meter that conforms to specifications published by the American National Standards Institute (ANSI).
Table 1
EXTERIOR NOISE LIMITS
(Levels not to be exceeded more than thirty minutes in any hour)
Noise Level (dBA)
Noise Zone
Classification*
Adjoining Land Use Category
Time Period
R-S zones
All other zones
Table 1
EXTERIOR NOISE LIMITS
(Levels not to be exceeded more than thirty minutes in any hour)
Noise Level (dBA)
Noise Zone
Classification*
Adjoining Land Use Category
Time Period
R-S zones
All other zones
One and two family Residential
10 p.m. -- 7 a.m.
7 a.m. -- 10 a.m.
40
50
45
55
Multiple dwelling
Residential Public Space
 
10 p.m. -- 7 a.m.
7 a.m. -- 10 p.m.
45
55
50
55
Limited commercial
some multiple dwellings
 
10 p.m. -- 7 a.m.
7 a.m. -- 10 p.m.
55
60
Commercial
10 p.m. -- 7 a.m.
7 a.m. -- 10 p.m.
60
65
Light Industrial
Anytime
70
Heavy Industrial
Anytime
75
* The classification of different areas of the community in terms of environmental noise zones is contained in the Noise Element of the General Plan. Additional area classifications should be used as appropriate to reflect both lower and higher existing ambient levels than those shown. Industrial noise limits are intended primarily for use at the boundary of industrial zones rather than for noise reduction within the zone.
 
   B. Permanent and temporary standby power supply.
      1.   Definitions.
         a.   “Permanent standby power supply.” A unit that is permanently installed and wired into the electrical panel in such a way as to provide instant standby power in the event of power failure.
         b.   “Temporary standby power supply.” A unit that is not permanently installed and is used in the course of a power failure.
      2.   Generators may be used as an auxiliary power source during periods of emergency when primary service is shut-off due to inclement weather, maintenance, or safety.
         a.   A minimum of 4" concrete slab shall be provided for the placement/location of the unit.
         b.   The location on the site shall be no closer than five (5) feet from the property lines at the rear and side yard setbacks for all zoning districts. No units are allowed in the front setback area.
         c.   Exhaust shall be located to face away from any window and door openings a minimum of ten (10) feet from openings.
         d.   Installation shall meet all requirements and all of the building codes including, but not limited to the California Electric Code, Plumbing Code, Fuel Gas Code, and Flammable and Combustible Liquids Code.
         e.   Maximum allowable sound levels may be up to 70 decibels. Continuous use shall be in accordance with the manufacturer's installation and use recommendations. Continuous use is allowed only during times of emergency upon power failure or shut-offs as described above and does not include power shut-off due to nonpayment of utility costs. Units may be tested in accordance with manufacturer's recommendations but no more than every two months for a period less than 15 minutes in length between the hours of 10 am and 4 pm.
(Ord. 836-2022 § 1, 2022; Ord. 823-2016 §25 (part), 2016)
17.74.040 Air pollution.
   A.   Visible Emissions. There shall not be discharged into the atmosphere from any source any air pollutant in excess of the Federal, State, or County limitations. This shall include emissions of air pollutants of such opacity as to obscure an observer's view to a degree equal to or greater than the visible emission described in this section. Visible emissions of any kind at ground level are prohibited past the lot line of the property on which the source of the emissions is located. No emission shall exceed No. 1 on the Ringelmann Chart, or as directed by the currently adopted measurement standard.
   B.   Materials Handling. No person shall cause or permit any materials to be handled, transported, or stored in a manner which allows or may allow particulate matter to become airborne and all transported materials shall be covered.
   C.   Particulate Matter. There shall not be discharged into the atmosphere any particulate matter in excess of the quantities allowed under the Butte County Air Quality Management Plan.
(Ord. 823-2016 § 25 (part), 2016)
17.74.050 Odors.
   Any condition or operation which results in the creation of odors of such intensity and character as to be detrimental to the health and welfare of the public, or which interferes unreasonably with the comfort of the public, shall be removed, stopped, or so modified as to eliminate the odor including the recreational or medical use of any drug, prescribed or not.
(Ord. 823-2016 § 25 (part), 2016)
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