2017 COMMENTS
COMMENTS 3/1/18 END OF YEAR 2017
Many of the events captured by the noise monitor turn out to be 'boy racer' vehicle exhaust noise or sirens from emergency service vehicles but there were a couple of short incidents during December which are more interesting and harder to identify as well as New Year's Eve fireworks at midnight.
In summary the Lazenby Noise levels very closely match those of 2016 and are the lowest levels since monitoring started in the early 1990s.
COMMENTS 3/12/17
November was an uneventful month. Noise level distribution curves remain at all time low.
COMMENTS 5/11/17
Most data acquired throughout October had to be discarded due to excessively high wind speeds. The small amount of acceptable data did not significantly change the overall noise distribution curves.
COMMENTS 2/10/17
Lazenby noise levels remain lowest ever recorded.
Two weeks on site data gathered at location adjacent to LDPE Flare. All
levels normal.
All routine on-site monitoring now discontinued.
COMMENTS 10/9/17
Distribution curves display lowest ever sound levels recorded at Lazenby. Many of the short incidents alerted by the Lazenby monitor appear to arise from regular occurrence of unsilenced car or motorcycle exhausts and occasionally from emergency vehicle sirens. there was an unidentified event shortly after midnight on the 3/8/17. The increase and fall in level occurred over a relatively long time and was not identified as an event by the monitor.
On-site measurements have been made local to Olefins 6 and the recorded data falls within normal bands. The on-site monitor is currently located near the LDPE flare. Once these measurements have been completed, routine on-site monitoring will cease.
COMMENTS 4/8/17
Lazenby environmental noise levels remain low. Incident detected on the 19th July - flaring?
COMMENTS 16/7/17
Lazenby environmental noise levels have returned to extreme low levels following a marginal increase last month - see distribution curves.
PC Environmental have experienced some difficulty with their server and this has resulted in update delays. a second independent server is now running under GT Acoustics direct control URL is lazenby.sytes.net (note spelling of sytes)
COMMENTS 3/6/17
Lazenby environmental noise levels remain low. Event audio files available on weekly time history. Events reulsting from birds, vehicle exhausts and emergency service vehicle sirens have been excluded.
Night time event triggering now stops at 03:30 to avoid excessive audio output from dawn chorus.
COMMENTS 4/4/17
Lazenby noise levels for the year to date are at lowest
level since monitoring started.
There was a short incident on the 7th March at 01:12 hours which resulted in
levels of 80 dBA at Lazenby.
In addition to the incident above the monitor has triggered a number of events
but these have resulted from excessive vehicle exhaust noise, emergency vehicle
sirens and birds.
Whilst the new monitor is working well some data was lost when the time changed
to BST. It would seem that the automatic time change reset the SLM and day
on the preceding few days was lost. This did not affect the automatically
recorded 1 second time history data.
COMMENTS - 6/2/17
Concurrent operation of the new and original Lazenby noise
monitors over the last few weeks confirm the accuracy of the systems and use of
the original monitor has now been discontinued. Time history traces from
both instruments can be viewed on the web site – any trivial discrepancy between
the traces is a result of inexact time synchronisation of the 1 minute time
intervals.
Analysis of the night time data confirms that the
background levels at Lazenby remain very low.
The ‘real time’ weekly traces clearly reveal the daily
variation in noise. Since Wilton plants operate continuously, 24 hours a
day, the Site impact at Lazenby has always (and still is) assessed on the noise
levels in the early hours of the morning when other noise sources are at a
minimum. The difference between daytime and night time noise is worth
noting and it can be argued that Wilton has a negligible impact on Lazenby for
most of the day.
Data can be viewed by pasting:
http://gtac.pcenvironmental.co.uk
Do please let me know of any changes or suggestions for
improvement that might be useful.
COMMENTS - 7/1/2017
There were no night time incidents during the last four weeks.
Lazenby data is now complete for 2016. Overall the levels for the year have matched the previous all time low of 2008 - see the distribution charts.
The new remote Lazenby monitor is ready for installation once welding on the microphone support bracket has been completed. There have been one or two issues that have had to be resolved. An earth loop on the modem caused interference with the sound level meter electronics which caused some false repetitive spikes in the data. In addition several crashes occured which could not be rectified remotely. A remote relay has now been added which enables isolation of the power and a complete remote reboot of the system.