Laserfiche WebLink
<br />. <br />. <br /> <br /> <br />~ tWJn Clt..... testlnQ <br />carpal8t:lon <br />. 662 CROMWELL AVENUE <br />S1 PAUL MN 5511. <br />PHONE 612if.i.S 3601 <br />ilPORT OF: NOISE SUi.VBY AND llECOHKENDATIO~ <br />ttDmERBEIRY BILL <br /> <br />PRO".CTr <br /> <br />RIIPORTSD TOr <br /> <br />Yorkton Limited tne <br />Attn: Hr Jeff Iisakka <br />1690 University Avenu~ <br />St Paul. MN 55104 <br /> <br />DATE: July 24. 1987 <br /> <br />A <br />~ <br /> <br />LABORATORY N~, 4141 87-1128 <br /> <br />IHTROOUCTION: <br /> <br />This report doeumefits th~ noise surveys performed as 3 result of the noise emitt~d by a <br />Hodel 148DF-Q28 combination heating/cooling unit lo,-ated on the Kinderberry Hill <br />daycare property. Rosev1l1e. H1nnesotr.. This work was requested by Jeff J1sakka of <br />Yorkton Limited Incorporated on July 1. 1987. with measurements taken on July 9. 1987 <br />and July 13. 1987. <br /> <br />CONCLUSIONS: <br /> <br />Nighttime (10:00 pm - 7:Ov am) LIO and LSO background (unit off) levels of 58-59 dBA <br />and 54~56 dBA. respectively were calculated for the two nights during a 15 lIinute <br />observation period. These levels exceed the MPCA (Minnesota Pollution Control Agency) <br />permls&lble night time LI0 and L50 levels of 55 dBA and SO dBA. respectively. <br /> <br />Nighttime LIO and LSO levels of 62 dBA and 58 dBA were calculated with the compressor <br />fans on. <br /> <br />Octave band measurements showed significant low frequency energy emitted by the unit. <br />A 10 dB difference was noticed for the overall linear levels for the on/off cases. A 4 <br />dB difference was noted for the A-weighted J~vels. <br /> <br />AtHOSPBERIC CONDITIONS: <br /> <br />Measurelllents were taken on two separate nigl>ts - July 9. 1987 and July 13. 1987. <br />Te~perature and humidity measurements were taken at the site with a sling psycrometer. <br />The following table documents the weather conditions for each of the two nights. <br /> <br />~ <br /> <br />Time <br /> <br />Telllperature <br /> <br />Wind <br /> <br />Relative Humidity <br /> <br />7~9-87 <br />7-13-87 <br /> <br />10:25 pm <br />11:00 pm <br /> <br />81 F <br />60 F <br /> <br />Trace <br />Trace <br /> <br />65% <br />78% <br /> <br />"'. A ......,,.U.... "OT.C::1'IDfir, TD 1:1.1........ Till. ......-t.-te At'ilDOU....L'II.. AU. "~1'. ..lit. .uaMt,...,.a.... '""I COf*ct:"",........ ".~....n C. CU.""',, aND AU'TI4DIIU- <br />&.TIOtlI iIRO.. ~.LtC....,.1O"lII DI' .Tit.TI"",aNT. ~ON4;:t,.U.~OIII..M.T"'''C::T. "tlQMcHlIi ....-b&NQ aua _.~T. I. "t...IlIVaD"~ DUll 'lfII1IM'fT.'" ...~vA_ <br />