Agenda item

Excavation of a new basement (including under existing vaults) and lowering of existing lower ground floor level. Construction of a single storey rear extension at lower ground floor, external lift shaft to the rear running from new basement level to upper ground and a rear mansard room.

Additional representations were received from one local resident (02/10/17) and Firstplan (02/10/17).

Late representations were received from one local resident (16/05/17) and Alan Baxter Partnership LLP (17/10/17).

The presenting officer tabled the following additional conditions:

Condition 16

(1)   Where noise emitted from the proposed plant and machinery will not contain tones or will not be intermittent, the ‘A’ weighted sound pressure level from the plan and machinery (including non-emergency auxiliary plant and generators) hereby permitted, when operating at its noisiest, shall not at any time exceed a value of 10 dB below the minimum external background noise, at a point 1 metre outside any window of any residential and other noise sensitive property, unless and until a fixed maximum noise level is approved by the City Council. The background level should be expressed in terms of the lowest LA90, 15 mins during the proposed hours of operation. The plant-specific noise level should be expressed as LAeqTm, and shall be representative of the plant operating at its maximum.

(2)   Where noise emitted from the proposed plant and machinery will not contain tones or will be intermittent, the ‘A’ weighted sound pressure level from the plan and machinery (including non-emergency auxiliary plant and generators) hereby permitted, when operating at its noisiest, shall not at any time exceed a value of 15 dB below the minimum external background noise, at a point 1 metre outside any window of any residential and other noise sensitive property, unless and until a fixed maximum noise level is approved by the City Council. The background level should be expressed in terms of the lowest LA90, 15 mins during the proposed hours of operation. The plant-specific noise level should be expressed as LAeqTm, and shall be representative of the plant operating at its maximum.

(3)   Following installation of the plant and equipment, you may apply in writing to the City Council for a fixed maximum noise level to be approved. This is to be done by submitting a further noise report confirming previous details and subsequent measurement data of the installed plant, including a proposed fixed noise level for approval by the City Council. Your submission of a noise report must include:

(a)A schedule of all plant and equipment that formed part of this application;

(b)Locations of the plant and machinery and associated ducting; attenuation and damping equipment;

(c)Manufacturer specifications of sound emissions in octave or third octave detail;

(d)The location of most affected noise sensitive receptor location and the most affected window of it;

(e)Distances between plant and equipment and receptor location/s and any mitigating features that may attenuate the sound level received at the most affected receptor location;

(f)  Measurements of existing LA90, 15 mins levels recorded one metre outside and in front of the window referred to in (d) above (or a suitable representative position), at times when the background noise is at its lowest during hours when the plant and equipment will operate. This acoustic survey to be conducted in conformity to BS 7445 in respect of measurement methodology and procedures;

(g)The lowest existing L A90, 15 mins measurement recorded under (f) above;

(h)Measurement evidence and any calculations demonstrating that plant and equipment complies with the planning condition;

(i)  The proposed maximum noise level to be emitted by the plant and equipment.

Condition 17

No vibration shall be transmitted to adjoining or other premises and structures through the building structure and fabric of this development as to cause a vibration dose value of greater than 0.4m/s (1.75) 16 hour day-time nor 0.26 m/s (1.75) 8 hour night-time as defined by BS 6472 (2008) in any part of a residential and other noise sensitive property.

RESOLVED:

That conditional permission, as amended, be granted.