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e :D/a5 IRCVI SUM I IISN/.IA 11116:0 <br />r� <br />1 1 S1, 4-1943. <br />2 subp. 3. Cal brat on. All sound level measuring devices <br />3 must, at a minimum, be recertified or cross-referenced according <br />a to American Nations: SLAndsrd Inst:tute s1.e-1903 annually. The <br />S equipment must be externally field calibrated before and after <br />a monitoring using a caaibration deviia v. :.._ <br />7 suund pressure level. <br />9 Subp. i. measurement procedures. The following procedures <br />9 must be used to oota:n representative sound level measurements: <br />10 A. Measurements must be made between thres and five <br />11 feet off the ground or surface and over from natural or manmads <br />12 structures which would diminish the sound level. <br />13 2. Measurements must be made using the A -weighting <br />16 and fast response characteristics of the sound measuring device <br />IS as specified :n American Nations; Standard Institute S1.4-1933. <br />16 C. measurements must not be made in sustained winds <br />11 greater than 12 miles per hour or in precipitation. <br />f16 0. Measurements must be made using a windscreen. <br />19 SuDp. S. Methods for determination of hourly Lsq. For the <br />20 determintn on of an hourly Leq' measuresents must be made using <br />21 the messur:ng devices as required under suti4rt 2 and used <br />22 according to the vrofacturer's recommendations. <br />23 A. Mr.d held as curing devices suit use the caeckoff <br />2e method descr bed in e71MA-DP-45-111, .action 3.f (August .904) for <br />2S determ.esuoi of hourly Lvq- <br />26 v. Automated or integrat,ng measunn2 dcvicr. sty ise <br />27 the checaoff method described in FWiA-0P-15-1A, section 3.6 <br />28 (August 1911) or be operstsd in sccordsnce with the <br />29 manufacturer's recomsendationm for determination of hourly Lsq. <br />30 C. Methods equl•alont to those described in ■ubisrt <br />31 S, items A and a may be used provided they are approved by the <br />32 director of the Minnesota Pollution Control Agency. <br />33 SuDp. 6. Calculation of Ldn. Ldn shall be calculated <br />la using the fo:lowing formula: <br />' 35 Ldn • 10 loglo 1/24 l(15 a 10 Ld/10 . 9 a 10 Ln•10/1011 <br />]6 hare Grew, •: is tvf <br />Apr .. ;•p�.•ti <br />L. <br />6 <br />