PROPOSED NOISE RULES FOR THE TAKANINI AREA 6 DEVELOPMENT

Transcription

1 HEGLEY AClllJSTIC CONSUI.TANT~ PROPOSED NOISE RULES FOR THE TAKANINI AREA 6 DEVELOPMENT Report No: 8110 Prepared for: Prepared by i~ "_? JJ \ Harrison Grierson Consultants Limited P 0 Box Manukau City August 2007 Rhys ~gley BE MIPENZ t "'tluttntt:nt.tl t."-.1 lndu,tla.tl '-n... t < ~nt1nl lngaihttlng 1.1A'\IUK, l >~0 X. B ~' fax l & B

2 TABLE OF CONTENTS 1. INTRODUCTION EXISINTING AND PROPOSED ZONING LANDUSE PLANNING EXISINTING DISTRICT PLAN NOISE RULES PROPOSED NOISE RULES CONCLUSIONS... 13

3 1. INTRODUCTION It is proposed to rezone land in Papakura from the current rural/residential zoning to industrial. The area under consideration is bounded by Takanini School Road to the west, Porchester Road to the east and Manukau City to the north. To the south, the site extends to the residentially zoned land immediately to the north of Manuroa Road. The site is shown on Rgure 1 below. M anukau City,.. -._. ~ LJ [ill] Site Boundary Residential 1 Rurai/Residentia Figure 1. Excerpt from Papakura District Plan Zoning Maps Showing Site This report considers the effects of noise from the proposal. It identifies planning methods for controlling these effects and proposes noise rules that are considered appropriate for the development.

4 2. EXISINTING AND PROPOSED ZONING Figure 1 above is an excerpt from the zoning maps of the Papakura District Plan and show the site zoned as Rural/Residential. The zoning of the surrounding land and the appropriate noise rules of the District Plan are described below: - To the north: This land is on the far side of Papakura Stream and is within Manukau City, where it is zoned as Residential; - To the south: Residential zone; - To the west: Predominately with some Residential to the south; - To the east: Rural/Residential The proposal is to rezone the existing Rural /Residential land to mainly with some Industrial 1 zoning.

5 3. LANDUSE PLANNING While the noise rules proposed below can be used to control the effects of noise from the proposal to the surrounding activities, there are a number of practicable features that could be considered for the proposal that will improve the amenity of the local environment such as: - Buffer Zones To control the effects of noise from one zone to another, it is recommended that the noise sensitive zones, such as Residential and Rural/Residential, be separated from the high noise zones, such as Industrial 1 and in particular. Appropriate buffer zones include open space. - Staged Zoning The noise rules proposed later in this report provide higher noise levels for than for Industrial 1. It is therefore recommended that the less intensive Industrial 1 zoning be used as a buffer zone between the noisier and the noise sensitive Residential and Rural/Residential zones. - Screening Placing a physical screen between the Industrial 1 and 3 sites and the Residential and Rural/Residential sites will help to control noise. While the screen could be a fence or earth bund (situated on an open space zone), the buildings proposed for the Industrial sites themselves could also be used as screens. For instance, assuming that each industrial site consists of a building and a yard, placing the building adjacent to the residential boundary will provide screening from activities within the yard.

6 4. EXISINTING DISTRICT PLAN NOISE RULES The relevant noise rules of the Papakura and the Manukau District Plans are important as it is proposed to base the noise rules for the proposal in then. The current noise rules are shown below: Zone Residential Rule 4 Criteria The noise level (L 10 ) as measured at or within the boundary of any residentially zoned site (other than the site from which the noise is emanating) shall not exceed the following limits: Monday - Friday Saturday At all other times including Sundays and public holidays 45dBA 45dBA 40dBA Noise control between units - An acoustic design Part 4 ii certificate shall demonstrate that the unit has been designed in such a manner as to comply with the following internal noise levels (L 10 ) Bedrooms Habitable Rooms 35dBA 45dBA

7 Industrial 6.15 TABLE A The noise level (l1ol shall be measured on the nearest residential boundary Monday to Friday between the hours Saturday l1o * Industrial 1 45dBA 55dBA At all other times including Sundays and public holidays l1o * Industrial 1 40dBA 50dBA * Noise level TABLE B The noise level (L10) as measured at or within the boundary of a site zoned for an industrial purpose shall not exceed the following limits: Industrial 1 50dBA 55dBA Rural 8.5 There is no general rule in the District Plan for Rural zones. Rule 8.5(1) applies to home occupations but is included as it provides an understanding as to the level of protection that Council consider suitable from Rural areas. Day time l1o = 60dBA Night time L1o = 40d8A Measured at the notional boundary (ie unless otherwise provided 20m from the closest point) of a residential building or at the property boundary, whichever is the shortest distance.

8 Main TABLE A Residential The noise level measured at of within the boundary of (in Manukau any site zoned Residential.. shall not exceed the City) following: Activit Average Maximum Level Maximum y L1o dba LrrexdBA Mon-Sat Mon-Sat At all other 7am-6pm 6pm-10pm times 10pm -7am Table 1. Summary of Existing District Plan Noise Rules

9 5. PROPOSED NOISE RULES The noise rules that are proposed for the project are shown in Table 2 below. The proposed rules have been based on the current rules in the District Plan but have been modified in some cases, the reason for which is discussed in the table.

10 Noise Rule Residential Zones The noise level as measured at or within the boundary of any residentially zoned site (other than the site from which the noise is emanating) shall not exceed the following limits: Comments This rule is a direct copy of the existing rule for residential zones with a provision for the control of the maximum noise level (Lmax). Monday - Friday Saturday At all other times including Sundays and public holidays 45dBA L,o 45dBA L,o 40dBA10, Night time Industrial Zones dBA Lmax TABLE A The noise level shall be measured at or within the boundary of any residential property or at the notional boundary* of any Rural/Residential property Monday to Friday between the hours Saturday Industrial 1 45dBA l 10 55dBA L,o At all other times including Sundays and public holidays Industrial 1 I 40dBA L,o I 45dBA l 10 All days between Industrial 1 l 75dBA Lmax I 75dBA Lmax This proposed rule is also a copy of the current rule w ith t he following changes: - The description of the measurement position has been modified to be similar to the more appropriately worded Residential rule; - The noise rule has been extended to include Rural/Residential zones as well as Residential zones; - An Lmax provision has been made, and some minor rewording was required to suit;

11 * The notional boundary is defined as a line 20m from the fa<;ade of any rural dwelling or the legal boundary where this is closer to the dwelling. TABLE B The noise level as measured at or within the boundary of a site zoned for an industrial purpose shall not exceed the following limits: Industrial 1 j50dba J65dBA A building that is located in an industry 1 or Industry 3 zone and which is to be used for Residential purposes shall be designed and constructed such that: The noise level inside any bedroom resulting from noise generated by permitted activities within the surrounding Industrial 1 or zone shall not exceed 35dBA L 10 in any bedroom. - The upper noise level from the zone at 'all other times including public holidays' has been reduced from 50dBA to 45dBA as 45dBA is the upper level recommended by NZS6802 for residential properties at night time. - The layout of this rule mimics the current rule. Given the additions proposed to the rule, there may be benefits in reviewing the layout. The level received by an zone has been increased from the current 55dBA to 65dBA. This is because under the current rule, 55dBA is considered restrictive for industry and compliance results in the requirement for expensive mitigation. The increased level is considered to be more appropriate. This rule has been added to allow for residential in industrial areas, if this is intended, to protect the industrial activities from reverse sensitivity. The rule is based on the current rule Part 4(ii). "' The noise level inside any habitable room, other than a bedroom, resulting from noise generated by permitted activities within the surrounding

12 ! Industrial 1 or zone shall not exceed! 45dBA L,o. I I i - The internal noise levels shall be achieved with ventilation windows open and with any mechanical ventilation required to ventilate the rooms in accordance with accordance with the Building Code, switched on. The noise level measured at of within the boundary of any This rule is intended to control noise generated within Papakura site within Manukau City to the north that is zoned when measured in Manukau District Council. The criteria in Residential shall not exceed the following the levels in the this rule are a direct copy of the criteria in the Manukau City Table below: Council District Plan and are therefore considered to be appropriate, but is it recommended that the legality of such a Activity Average Maximum level Maximum l1o dba lrrexdba rule be considered before it is incorporated into the Plan. I Mon-Sat Mon-Sat At all other 7am-6pm 6pm- 10pm times 10pm -7am ~esidential "

13 6. CONCLUSIONS The noise rules for the proposed Takanini Area 6 development have been based on the existing noise rules of the Papakura District Plan but updated where appropriate. As the development boarders a residential zone in Manukau City, the criteria of the District Plan for Manukau District Council have been included in the proposed noise rule. Rhys Hegley August 2007