§ 3-9. Manufacturing uses.

The following performance standards shall be used to ensure that all conditionally permitted manufacturing uses and refuse systems in the LM district shall produce no injurious or obnoxious conditions related to the operation of such uses sufficient to create a nuisance beyond the premises.

(1)

Vibration. No vibration shall be produced which is transmitted through the ground and is discernible without the aid of instruments at any point beyond the lot line; nor shall any vibration produced exceed the following particle velocity levels, measured with a vibration monitor in inches per second at the nearest:

(a)

Residential property line: 0.02

(b)

Non-residential property line: 0.10

Vibration emanating from construction activities between 7:00 a.m. and 9:00 p.m. shall be exempt from these regulations.

(2)

Fire and explosives. All activities and all storage of flammable and explosive materials shall be provided with adequate safety devices against the hazards of fire and explosion, including adequate fire fighting and fire suppression equipment.

(3)

Noise. 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 facility exceed at the lot line the values given in tables III and IV in any octave band or frequency. Sound pressure level shall be measured with a sound level meter and an octave band analyzer that conforms to specifications published by the American National Standards Institute.

Table III
Night Time Schedule

Maximum permissible sound pressure levels at the lot line for noise radiated continuously from a facility between the hours of 9 p.m. and 7 a.m. [shall not exceed those expressed in this table.]

	Sound Pressure Levels (In Decibels)
Frequency Band (In Cycles Per Second)	At Non-Residential Lot Line	At Residential Lot Line
20—75	69	65
76—150	60	50
151—300	56	43
301—600	51	38
601—1,200	42	33
1,201—2,400	40	30
2,401—4,800	48	28
4,801—10,000	35	20

 

Table IV
Day Time Schedule

Maximum permissible sound pressure levels at the lot line for noise radiated from a facility between the hours of 7 a.m. and 9 p.m. shall not exceed the limits of the preceding table except as specified and corrected below.

Type of Operation in Character of Noise	Correction in Decibel*
Daytime Operation Only	Plus 5
Noise source operates less than 20% of any one-hour period	Plus 5
Noise source operates less than 5% of any one-hour period	Plus 10
Noise source operates less than 1% of any one-hour period	Plus 15
Noise of impulsive character (hammering, etc.)	Minus 5
Noise of periodic character (hum, speech, etc.)	Minus 5

 

* Apply to table III only one of these corrections.

Noises emanating from construction activities between 7:00 a.m. and 9:00 p.m. shall be exempted from these requirements.

(4)

Air pollution. The emission of visible smoke, dust, dirt, fly ash, particulate matter from any pipes, vents, or other openings, or from any other source into the air, shall comply with the regulations of the South Carolina Department of Health and Environmental Control.

(5)

Odor. There shall be no emission of odorous gases or other odorous matter in such quantities as to be offensive at the property line. Any process which may involve the creation or emission of any such odor shall be provided with both a primary and a secondary safeguard system so that control may be maintained in the event of failure of the primary safeguard system.

(6)

Glare. There shall be no direct or sky reflected glare, whether from floodlights, high temperature processing, combustion, welding or otherwise, so as to be visible in any residence.

(7)

Fumes and vapors. There shall be no emission of any fumes or vapors of a noxious, toxic or corrosive nature which can cause damage or irritation to health, animals, vegetation, or to any form of property.

(8)

Heat, cold, dampness or movement of air. Activities which could produce any adverse affect on the temperature, motion or humidity of the atmosphere beyond the lot line shall not be permitted.

(9)

Toxic matter. The applicant of a permit for any facility which would utilize toxic matter in the process of manufacturing, fabricating, assembling, packaging, or any related activity, shall provide with the application a certificate from the South Carolina Department of Health and Environmental Control, indicating compliance with the rules and regulations of such agency.

(10)

Exterior illumination. All operations, activities, and uses shall be conducted so as to comply with the performance standards governing exterior illumination prescribed below.

In general, the pattern of light pooling from each light source shall be carefully considered to avoid throwing light onto adjacent properties. Light sources visible in residential or medical areas shall comply with light intensities indicated in column A below. Light sources visible in commercial or industrial areas shall comply with light intensities indicated in column B below.

Maximum Intensity of Light Sources

	Column A	Column B
Bare incandescent bulbs	15 watts	40 watts
Illuminated buildings	15 ft. candles	30 ft. candles
Back lighted or luminous background signs	150 ft. lamberts	250 ft. lamberts
Outdoor illuminated signs & poster panels	25 ft. candles	110 ft. candles
Any other unshielded sources, intrinsic brightness	50 candela per square centimeter	50 candela per square centimeter

 

Illumination shall be measured from any point outside the property. Illumination levels shall be measured with a photoelectric photometer having a spectral response similar to that of the human eye, following the standard spectral luminous efficiency curve adopted by the International Commission on Illumination.

(11)

Compliance guarantee. The applicant of a permit for a manufacturing or processing plant which would produce any of the above "objectionable elements" shall acknowledge in writing his understanding of the performance standards applicable to the proposed use and shall submit with the permit application, an agreement to conform with such standards at all times. Any violation of the agreement shall constitute a violation of this ordinance and shall be treated accordingly.

Where there is a potential problem in meeting any one of the performance criteria in this section, the applicant may request a variance before the board of zoning appeals, as provided for in this ordinance.