British Columbia Noise Control Best Practices Guideline

Dwellings exactly 100 m or 500 m from transportation

The notes to table 1 put a dwelling less than 100 m away in category 3, more than 100 m and less than 500 m in category 2, and more than 500 m in category 1. They do not place a dwelling at exactly 100 m or 500 m. The glossary puts a dwelling at 100 m or more in category 2 and at 500 m or more in category 1. This profile follows the glossary.

Changes Adjustment for proximity to transportation

British Columbia Noise Control Best Practices Guideline, 2.2, table 1 notes and appendix A, category 1 to category 3

The duration signs of table 3

Table 3 prints the durations of B1 and B2 as "<_1 day" and "<_30 days", and the duration of B3 as "≤ 60 days". This profile reads all three as upper bounds that include the number: up to 1 day is B1, more than 1 and up to 30 days is B2, and more than 30 and up to 60 days is B3.

Changes Class B adjustment

British Columbia Noise Control Best Practices Guideline, 2.3.5, table 3

What the duration of an activity counts

The note before table 3 says that the adjustments apply to "activities with a combined duration that exceed the Basic Sound Level plus any applicable Class A adjustment for an individual residence over a 12 - month period". This profile reads the duration as the sum, in a period of 12 months, of the time of all activities whose predicted level at the dwelling is above the basic sound level plus the Class A adjustment. The guideline does not say that the activity can happen only once in 12 months.

Changes Temporary activity

British Columbia Noise Control Best Practices Guideline, 2.3.5, note

When the seasonal adjustment applies

Table 2 gives the seasonal adjustment as +5 dB. Section 2.3.3 says it may be allowed for wintertime complaints, after approval, and that it is not added for design. This profile adds the full 5 dB for a wintertime complaint that the regulator approved, and nothing in a noise impact assessment.

Changes Seasonal adjustment (A1)

British Columbia Noise Control Best Practices Guideline, 2.3.2, table 2 and 2.3.3

What is taken to the nearest whole number

The guideline says to determine the difference between the basic sound level and the measured ambient sound level "to the nearest whole number". The basic sound level is a whole number. This profile takes the measured ambient sound level to the nearest whole number, a half away from zero, and then subtracts. A measured level of 37.5 dB(A) counts as 38 dB(A).

Changes Nighttime ambient monitoring adjustment (A2)

British Columbia Noise Control Best Practices Guideline, 2.3.4, to use figure 1

What the 65 dB(A) limit applies to

The note says that the nighttime permissible sound level cannot exceed 65 dB(A) after adjustments. This profile limits the nighttime sum of the basic sound level and the adjustments. It does not limit the daytime level, and it does not limit an existing noise level that is the permissible sound level.

Changes Nighttime sum, limited

British Columbia Noise Control Best Practices Guideline, 2.1, note

Facilities from before October 17, 1998

Section 2.4 first says that the existing noise level of an exempt facility with no complaint is its permissible sound level, also when it is expanded or modified. It then says that the exempt status ended on November 30, 2018: a change that increases noise levels, and a valid complaint, use the calculated level. Appendix B still says that the existing level may be the level for a facility that is modified. This profile uses the existing level for an exempt facility only when there is no complaint and the run assesses no change that increases its noise levels.

Changes Existing noise level

British Columbia Noise Control Best Practices Guideline, 2.4 and appendix B

Existing noise level as the permissible sound level

The guideline says that the existing noise level is the permissible sound level for a dwelling built near an existing facility (section 1.8), and for an exempt facility "even if it is currently above" the calculated level (section 2.4). This profile takes a later dwelling's existing level as it is, lower or higher than the calculated level, and an exempt facility's existing level only when it is higher. When both apply, the later dwelling's rule decides, as section 1.8 names that dwelling's level.

Changes Nighttime permissible sound level

British Columbia Noise Control Best Practices Guideline, 1.8 and 2.4

No net increase

Example 3 says that no net increase is defined in appendix A, but appendix A does not define it. The example says that it means that the total noise, with the proposed well or facility, does not exceed 40.0 dB(A): the permissible sound level. This profile has no separate criterion for it. It reads the existing noise level as a level with the ambient sound, as a survey measures it, and judges the cumulative level plus the ambient sound level against the permissible sound level.

Changes Compare with the nighttime permissible sound level

British Columbia Noise Control Best Practices Guideline, 2.4 and appendix H, example 3, summary and item 8

Where the 1.5 km starts

Section 1.2 measures the 1.5 km from the facility property line. Sections 2.1 and 3.1 measure it from the fence line. The glossary says that the facility property, the boundary of the legal interest in the land, sets the 1.5 km distance, and example 3 uses the facility property boundary. This profile uses the boundary of the facility property.

Changes Dwellings within 1.5 km

British Columbia Noise Control Best Practices Guideline, 1.2, 2.1, 3.1 and appendix A, facility property

No daytime level at 1.5 km

Sections 1.2 and 2.1 state a nighttime level only. This profile sets no daytime level when no dwelling is within 1.5 km.

Changes Permissible sound level at 1.5 km

British Columbia Noise Control Best Practices Guideline, 1.2 and 2.1

A dwelling farther than 1.5 km

Section 2.1 judges the level at the dwelling or at 1.5 km, whichever is the lesser distance. Example 3 also judges a dwelling at 1.8 km, because the noise of two facilities together can affect it, with the permissible sound level of chapter 2. This profile judges such a dwelling as a dwelling: the caller runs the flow for it and gives 1 as the number of dwellings. It does not state the rule for the area where the 1.5 km boundaries of two facilities overlap.

Changes Is a dwelling within 1.5 km?

British Columbia Noise Control Best Practices Guideline, 2.1 and appendix H, example 3, items 6 and 7

Levels are compared to one decimal

Example 3 adds 19.4 dB(A), 38.3 dB(A) and 35.0 dB(A), states the sum as 40.0 dB(A) and says that a permissible sound level of 40 dB(A) is not exceeded. This profile rounds the level to judge to one decimal before it compares, in assessments and in complaint investigations.

Changes Nighttime level to judge

British Columbia Noise Control Best Practices Guideline, appendix H, example 3, item 7

Which ambient sound level is added

Section 3.2.1 adds the average rural ambient sound level, 5 dB(A) less than the basic sound level, to the predicted level. The glossary says that this level is assumed "in the absence of measurement". This profile adds the measured ambient sound level when an approved ambient monitoring adjustment (A2) uses it, and the assumed level in every other case.

Changes Nighttime ambient sound level

British Columbia Noise Control Best Practices Guideline, 3.2.1 and appendix A, ambient sound level

Which facilities the cumulative level counts

Section 3.2.2 counts existing, approved and proposed wells and facility operations. Section 3.1 and the glossary count energy-related facilities, which other agencies can regulate. This profile counts every energy-related facility, existing or approved, with the proposed one.

Changes Cumulative nighttime level

British Columbia Noise Control Best Practices Guideline, 3.1, 3.2.2 and appendix A, cumulative noise level

A tone at exactly 250 Hz

Section 4.2.1 asks for a tone at a frequency below 250 Hz. Section 4.2.1.1, the glossary and the example of appendix G include the 250 Hz band. This profile includes the 250 Hz band.

Changes BC guideline low frequency tonal test

British Columbia Noise Control Best Practices Guideline, 4.2.1, 4.2.1.1, appendix A and appendix G

A level that the regulator set

Section 2.1 says that the regulator can assess the permissible sound level on a site-specific basis and can permit a level above the level of that section. The guideline does not say how such a level joins the calculated one. This profile takes a level that the regulator set as the permissible sound level for the period it is set for, in place of the calculated level and its 65 dB(A) nighttime maximum, and keeps the calculated level for a period with none. The level is for a dwelling; the point at 1.5 km keeps its level.

Changes Levels that the regulator set

British Columbia Noise Control Best Practices Guideline, 2.1

Nighttime permissible sound level

The sound level judged at the dwelling for the nighttime is at most the nighttime permissible sound level. For an assessment before construction it is the cumulative level of the energy facilities plus the ambient sound level. For a complaint it is the isolated contribution of the well or facility, with the low frequency noise penalty when it applies.

The amount judged is at most psl_night

Judged in Compare with the nighttime permissible sound level (Noise impact assessment), Compare with the nighttime permissible sound level (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 2.1, 3.2.1, 3.2.2, 4.1 and 4.2

Daytime permissible sound level

The sound level judged at the dwelling for the daytime is at most the daytime permissible sound level. It is judged when day and night operations differ, or when a complaint is about the daytime.

The amount judged is at most psl_day, when day_required is true

Judged in Compare with the daytime permissible sound level (Noise impact assessment), Compare with the daytime permissible sound level (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 2.3.1, 3.3 and 4.2, item 4

Nighttime level with no dwelling within 1.5 km

With no dwelling within 1.5 km of the facility property, the nighttime level 1.5 km from it is at most 40 dB(A).

The amount judged is at most Permissible sound level with no dwelling within 1.5 km (40 dB), when dwellings_within_remote_distance = 0

Judged in Compare with the level at 1.5 km (Noise impact assessment)

British Columbia Noise Control Best Practices Guideline, 1.2, 2.1 and 3.1

Acceptable nighttime data

The survey holds at least 3 hours of acceptable data for the nighttime, after isolation analysis.

The amount judged is at least Least acceptable survey data (3 h)

Judged in Is there enough nighttime data? (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.2, item 4 and 4.4.2

Acceptable daytime data

When the daytime is judged, the survey holds at least 3 hours of acceptable data for the daytime, after isolation analysis.

The amount judged is at least Least acceptable survey data (3 h), when day_required is true

Judged in Is there enough daytime data? (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.2, item 4 and 4.4.2

Noise Management Program

Before permitted activities start, the permit holder has a documented Noise Management Program and keeps it up to date. It names who is responsible, the noise sources, the rules for noise impact assessments, how noise is monitored, the mitigation methods, the complaint response, where site plans are made, continual improvement and the reports to the regulator. The regulator gets it on request.

British Columbia Noise Control Best Practices Guideline, 1.3

Noise mitigation plan for a well site

Before a well site is prepared, the permit holder makes and uses a site-specific noise mitigation plan when a noise concern was expressed in consultation or a dwelling is within 800 m of the well site. The plan holds a screening noise impact assessment for the drilling and completions activities and, when that shows a level above the permissible sound level at a dwelling, the mitigation. The plan is at the well site during the activities.

distance

800 m

British Columbia Noise Control Best Practices Guideline, 1.7

Noise levels given to people who plan dwellings

The permit holder tells landowners, residents and developers who propose a dwelling near a facility the existing noise levels, and keeps a record of what it told them.

British Columbia Noise Control Best Practices Guideline, 1.8

Technical verification of adjustments

Technical verification, or a model where one applies, supports each adjustment to the basic sound level.

British Columbia Noise Control Best Practices Guideline, 2.3.2

Approval of the seasonal adjustment

The seasonal adjustment (A1) is used only for a wintertime complaint, after consultation with the regulator's engineering division and its approval. It is never used for design.

Recorded in Approval of the seasonal adjustment (Permissible sound level)

British Columbia Noise Control Best Practices Guideline, 2.3.3 and 4.3

Approval of the ambient monitoring adjustment

The regulator's engineering division approves the use of an ambient monitoring adjustment (A2) before it is used. It applies only to a pristine area or an area with activity that is not energy-related and that changes the ambient sound level.

Recorded in Approval of the ambient monitoring adjustment (Permissible sound level)

British Columbia Noise Control Best Practices Guideline, 2.3.4

Ambient sound level survey

The ambient sound level is measured with no energy-related industrial component, in a continuous survey of 24 hours, 15 m from the dwelling and under representative conditions, with a level for the daytime and a level for the nighttime. A model that the regulator accepts can replace the survey.

distance

15 m

duration

PT24H

British Columbia Noise Control Best Practices Guideline, 2.3.4

Residents informed of a temporary activity

Before a Class B adjustment is used, the permit holder informs the residents who may be affected of the duration and the nature of the noise.

Recorded in Residents informed of a temporary activity (Permissible sound level)

British Columbia Noise Control Best Practices Guideline, 2.3.5

Noise impact assessment required

A noise impact assessment is done for a new well or facility where excessive noise can reasonably be expected at a nearby dwelling, and for a change to a facility that can be expected to change its noise sources or levels with a receptor within 1.5 km. A well site with a noise mitigation plan does not need a second assessment.

British Columbia Noise Control Best Practices Guideline, 3.2, paragraph 1

Modelled under operating conditions

The facility is modelled under its operating conditions, such as doors and windows closed, and it then operates under them.

Recorded in Modelled under operating conditions (Noise impact assessment)

British Columbia Noise Control Best Practices Guideline, 3.1 and 4.2, item 3

Assessment kept for audit

The permit holder keeps the assessment for audit and for a request from the regulator. When it shows that the permissible sound level is not met, the permit holder considers further attenuation; when that is not practicable, the assessment goes with the application, with the reasons.

British Columbia Noise Control Best Practices Guideline, 3.2, paragraph 3

Acoustical engineering practice

Measurement and modelling follow appropriate acoustical engineering practice, and all documents are available for audit.

British Columbia Noise Control Best Practices Guideline, 3.2.3

Effects the model includes

The model includes geometric spreading, barrier effects, atmospheric absorption, ground attenuation, and a specific wind speed and direction.

effects

geometric spreading; barrier effects; atmospheric absorption; ground attenuation; specific wind speed and direction

Recorded in Effects the model includes (Noise impact assessment)

British Columbia Noise Control Best Practices Guideline, 3.2.4, paragraph 2

Summertime conditions for the model

The model uses summertime conditions: a wind of 5.0 to 7.5 km/h from the facility to the receptor, a temperature of 0 to 25 degrees Celsius, a relative humidity of 70 to 90 per cent, and the topography and ground cover of the site.

wind speed

5 km/h to 7.5 km/h

wind direction

From the facility to the receptor.

air temperature

0 degC to 25 degC

relative humidity

70 % to 90 %

Recorded in Summertime conditions for the model (Noise impact assessment)

British Columbia Noise Control Best Practices Guideline, 3.2.4, paragraph 4

Accepted protocol for the model

The regulator recommends a model that meets an accepted protocol or international standard, such as CONCAWE or ISO 9613. It does not endorse one standard or program.

standards

CONCAWE; ISO 9613

Recorded in Accepted protocol for the model (Noise impact assessment)

British Columbia Noise Control Best Practices Guideline, 3.2.4, paragraph 5

Representative conditions for the model

The concerns of local residents set the conditions that are modelled. The model is field-calibrated when practical, predicts by frequency, and states the operating conditions as numbers.

British Columbia Noise Control Best Practices Guideline, 3.2.4, paragraph 6

Low frequency noise in the model

The model of a new facility, or of a change to a facility, considers low frequency noise.

British Columbia Noise Control Best Practices Guideline, 3.2.5

Contents of the assessment

The assessment holds the permissible sound level and how it was worked out, the direction and distance of the dwelling, the sources and their sound levels in octave bands, the operating conditions, the parameters of the model, the predicted cumulative level and whether it is consistent with the guideline, the attenuation measures, and the analyst.

British Columbia Noise Control Best Practices Guideline, 3.3

Contents of a screening assessment

A screening noise impact assessment uses a noise model that follows acoustical engineering principles or field validation studies. It is specific to the site, and gives a permissible sound level and a predicted level for each dwelling within 1.5 km. The studies behind it are available on request, and it says how it is used to assess the risk of complaints.

British Columbia Noise Control Best Practices Guideline, 3.3

Conditions for the simplified estimate

A level from the estimate of 6 dB for each doubling of distance is used only under the conditions of appendix F: one small stationary source, no other industry, flat ground and one near dwelling, or no dwelling within 1.5 km of the facility property; and both distances about five times the size of the source, or the first distance at least 50 m. A level measured in the near field is not used.

minimum distance

50 m

Recorded in Conditions for the simplified estimate (Simplified estimate of a level at another distance)

British Columbia Noise Control Best Practices Guideline, 3.2.3 and appendix F

Construction noise

The permit holder does construction between 07:00 and 22:00, tells nearby residents of noisy activities and schedules them to reduce disruption, fits mufflers to all internal combustion engines, and uses buildings on the site as screens. The guideline sets no sound level for construction.

hours

start 07:00, end 22:00

British Columbia Noise Control Best Practices Guideline, 1.6 and 3.1.1

Complaint resolution

The permit holder makes every reasonable attempt to investigate a complaint in a timely manner. It first makes direct contact with the complainant, explains the guideline, and sets out the process and the timelines it will follow.

Recorded in Complaint resolution (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.1 and 4.2, items 1 and 2

Noise Complaint Investigation Form

Before a survey, the permit holder and the complainant complete parts 1 and 2 of the Noise Complaint Investigation Form to set the representative conditions. The complainant gets a copy and the survey report holds one. When the form is not completed, the report says why and how the representative conditions were chosen.

Recorded in Noise Complaint Investigation Form (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.2 and appendices C and D

Representative survey

The survey covers a representative part of the time of day or night on days when the noise typically occurs, at the first opportunity when the representative operating and propagation conditions can be met. It lasts from 9 to 24 hours, and its nighttime and daytime periods are consecutive.

duration

PT9H to PT24H

Recorded in Representative survey (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.2

Measurement position

The measurements are made 15 m from the complainant's dwelling in the direction of the source, unless that is physically impossible or acoustically illogical.

distance

15 m

Recorded in Measurement position (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.2, item 4

Survey conditions for an exempt facility

When the permissible sound level of an exempt facility came from a model, the survey is made under seasonal and meteorological conditions like those the model used, or its result is adjusted for them.

British Columbia Noise Control Best Practices Guideline, 4.2, item 5

Measurements for low frequency noise

When low frequency noise is possible, the C-weighted and A-weighted levels are measured at the same time, and the local wind is measured through the whole assessment period, at the height of the microphone.

British Columbia Noise Control Best Practices Guideline, 4.2.1 and appendix G

Weather during the survey

The survey data are taken in the conditions of table 4, applied with judgement, when the completed form does not set the representative conditions. Gusts shorter than five minutes of up to 20 km/h may be acceptable. In a survey of 24 hours, the wind blows directly to the complainant for at least 3 hours of the nighttime and 3 hours of the daytime.

ground cover

No snow, water or ice.

precipitation

No steady precipitation.

wind speed limits

Less than 500 m from the source, upwind 10 km/h, crosswind 15 km/h, downwind 15 km/h; 500 m to 1000 m from the source, upwind 5 km/h, crosswind 10 km/h, downwind 10 km/h; More than 1000 m from the source, upwind 5 km/h, crosswind 10 km/h, downwind 10 km/h

gust

20 km/h

gust duration

PT5M

wind height

1.2 m to 10 m

downwind

3 h

Recorded in Weather during the survey (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.3, table 4

Wintertime complaint

For a wintertime complaint, the representative conditions are determined and the survey is made under those conditions or similar ones.

British Columbia Noise Control Best Practices Guideline, 4.3

Multiple noise sources

The Noise Investigation Report states the method used to assess several sources or to isolate one, and explains the relative contribution of each source.

British Columbia Noise Control Best Practices Guideline, 4.4.1

Isolation analysis

When the survey result is over the permissible sound level and the well or facility may not be the cause, an isolation analysis separates its contribution. A recording, an operating log or an event log supports each removal of data. Data are removed for wind over the limit, precipitation, a monitor upwind of the source, noise from animals, abnormal noise events and sources that the regulator does not regulate.

British Columbia Noise Control Best Practices Guideline, 4.2 and 4.4.2

Instruments

Sound level meters measure the energy equivalent sound level and meet Class 1 of IEC 61672. Filters for one-third octave bands meet Class 1 of IEC 61260 or ANSI S1.11.

class

1

standards

IEC 61672; IEC 61260; ANSI S1.11; ANSI S1.4

Recorded in Instruments (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.5.1

Calibration

The calibrator is recertified each year. The meter is calibrated by its maker or an authorized facility within the two years before the measurement, and in the field just before and just after it with the same Class 1 calibrator. The report holds the calibration results. Data from a meter that reads more than 1 dB off in a field check are not used.

calibrator interval

P1Y

meter interval

P2Y

tolerance

1 dB

Recorded in Calibration (Noise complaint investigation)

British Columbia Noise Control Best Practices Guideline, 4.5.1.1 and 4.5.1.2

Noise management plan

When the permissible sound level is exceeded and the noise continues, a noise management plan names the noise sources, assesses the mitigation in place, states how noise is measured and how well the noise controls perform, and has best practices and continuous improvement programs. Everyone who may be affected is consulted and their input is in the plan.

British Columbia Noise Control Best Practices Guideline, 4.1

Nighttime: 22:00 to 07:00

The hours from 22:00 to 07:00.

British Columbia Noise Control Best Practices Guideline, appendix A, nighttime

Daytime: 07:00 to 22:00

The hours from 07:00 to 22:00.

British Columbia Noise Control Best Practices Guideline, 2.3.1 and appendix A, daytime

Average rural ambient sound level at night

The average ambient sound level at night in a rural area.

British Columbia Noise Control Best Practices Guideline, 2.2

Allowance above the ambient sound level

The basic sound level is this much above the ambient sound level.

British Columbia Noise Control Best Practices Guideline, 2.1, 2.2 and 3.2.1

Basic sound level for nighttime, category 1, 1 to 8 dwellings

The lowest basic sound level: the average rural ambient sound level plus the allowance.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1

Density adjustment, 9 to 160 dwellings

Added to the basic sound level for 9 to 160 dwellings in the quarter section.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1

Density adjustment, more than 160 dwellings

Added to the basic sound level for more than 160 dwellings in the quarter section.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1

Transportation adjustment, category 2

Added to the basic sound level for a dwelling in category 2.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1

Transportation adjustment, category 3

Added to the basic sound level for a dwelling in category 3.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1

Category 3 distance

A dwelling closer than this to a heavily travelled road or a rail line is in category 3.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1 notes and appendix A, category 3

Category 2 distance

A dwelling closer than this to a heavily travelled road or a rail line, and not in category 3, is in category 2.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1 notes and appendix A, category 2

Radius of the quarter section

The dwellings are counted in a quarter section with the dwelling at its centre: a circle of this radius.

British Columbia Noise Control Best Practices Guideline, 2.2, table 1 notes

Daytime adjustment

The daytime basic sound level is this much above the nighttime one.

British Columbia Noise Control Best Practices Guideline, 2.3.1

Seasonal adjustment (A1)

The seasonal adjustment for wintertime conditions.

British Columbia Noise Control Best Practices Guideline, 2.3.2, table 2

Largest ambient monitoring adjustment (A2)

The ambient monitoring adjustment is from minus this amount to plus this amount.

British Columbia Noise Control Best Practices Guideline, 2.3.2, table 2 and 2.3.4, figure 1

Largest Class A adjustment

The sum of A1 and A2 is at most this amount.

British Columbia Noise Control Best Practices Guideline, 2.3.2, table 2 note

Class B1 adjustment

For an activity that lasts 1 day or less.

British Columbia Noise Control Best Practices Guideline, 2.3.5, table 3

Class B2 adjustment

For an activity that lasts 30 days or less.

British Columbia Noise Control Best Practices Guideline, 2.3.5, table 3

Class B3 adjustment

For an activity that lasts 60 days or less.

British Columbia Noise Control Best Practices Guideline, 2.3.5, table 3

Longest Class B1 activity

An activity that lasts this long or less has the Class B1 adjustment.

British Columbia Noise Control Best Practices Guideline, 2.3.5, table 3

Longest Class B2 activity

An activity that lasts longer than Class B1 and this long or less has the Class B2 adjustment.

British Columbia Noise Control Best Practices Guideline, 2.3.5, table 3

Longest temporary activity

An activity that lasts longer than this is not temporary and has no Class B adjustment.

British Columbia Noise Control Best Practices Guideline, 2.3.5, table 3

Largest nighttime permissible sound level

The nighttime permissible sound level after adjustments is at most this amount.

British Columbia Noise Control Best Practices Guideline, 2.1, note

Permissible sound level with no dwelling within 1.5 km

The nighttime level a well or facility meets at the remote distance when no dwelling is closer.

British Columbia Noise Control Best Practices Guideline, 1.2 and 2.1

Remote distance

With no dwelling within this distance of the facility property, the level is judged at this distance.

British Columbia Noise Control Best Practices Guideline, 1.2, 2.1 and appendix A, facility property

Well site distance for a noise mitigation plan

A well site with a dwelling within this distance needs a site-specific noise mitigation plan.

British Columbia Noise Control Best Practices Guideline, 1.7

Length of an ambient sound level survey

An ambient sound level survey is continuous for this long.

British Columbia Noise Control Best Practices Guideline, 2.3.4

Low frequency noise difference

A C-weighted level this much above the A-weighted level, with a tone, is low frequency noise.

British Columbia Noise Control Best Practices Guideline, 4.2.1

Low frequency noise tone limit

The tone is in a one-third octave band at or below this frequency.

British Columbia Noise Control Best Practices Guideline, 4.2.1.1

Low frequency noise penalty

Added to the comprehensive sound level when low frequency noise is confirmed.

British Columbia Noise Control Best Practices Guideline, 4.2.1

Least acceptable survey data

The least time of acceptable data, after isolation analysis, for each period of a survey.

British Columbia Noise Control Best Practices Guideline, 4.2, item 4

Measurement distance from the dwelling

Sound levels are measured, and the permissible sound level applies, this far from the dwelling towards the source.

British Columbia Noise Control Best Practices Guideline, 1.2 and 4.2, item 4