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May 20 2013 Valero Energy has large flaring event with loud roaring and vibrations from the plant that shakes houses, light fixtures, ceiling fans, etc. The source is reported to be the hydrocracker again, which had ongoing flaring since early May 2013.
http://concernedcitizensaroundmurphy.blogspot.com/p/2013.html
Throughout the recent past, residents have endured countless days of continuous earsplitting noise levels or roaring noise that sounds like jet engines. In the past several years, , noise measured above the local ordinance limits have been attributed to many different sources within the processing plant, include the hydrocracker, the cat cracker, broken boilers from Katrina, steam atomizers on top the flares, low NOx burners, vacuum trucks, processing valves on ALKY unit, steam use, over steaming to the flares, and various startup and shutdown proceedures. Residents received many promises for appropriate noise muffling and sound barriers at the source point. In 2010, a Judge found the plant owners (Murphy Oil) had not installed appropriate noise control equipment. Prior to the sale of the refinery, when management purported to be the transition team, in a Fall 2011 public meeting, we explained the refinery processes and equipment are still shaking our houses. There was little to no response, no new expressed concern to further a solution. When asked for information on a particular August 2011 incident which caused houses to move and rumble, it was said there was no information for that date. While some information was available for the May 2013 occurrence, it did not include any remedies for an unacceptable situation.
We have an unfortunate zoning situation with heavy industry adjacent to residential neighborhoods. Despite its industrial zoning, excessive noise is out of place and unwelcome here. No neighborhood should be subjected to such "typical refinery noises" yet these noises continue to disturb us at all times of the day and night. Therefore, measures that are appropriate for normal industry practice are inadequate under these circumstances. Industry must recognize the need to do more than other refineries that are properly buffered from residences.
This noise is interfering with human activities.
Interference with activities such as speech, sleep,
and learning – The thresholds for speech
interference indoors are about 45 dBA if the noise
is steady and above 55 dBA if the noise
is fluctuating. Outdoors, the thresholds are about
15 dBA higher. Steady noise of
sufficient
intensity (above 35
dBA) and fluctuating noise levels above about 45 dBA have been
shown to affect sleep.
…..annoyance felt in a community for noises intruding into homes or
affecting outdoor activity areas, the main causes
for annoyance are interference with
speech,
radio and television, house vibrations, and interference with sleep and rest…..
Hearing loss occurs mainly due to chronic
exposure to excessive noise, but may be due to a
single event such as an explosion. Natural
hearing loss associated with aging may also be
accelerated from chronic exposure to loud
noise