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C. Measurements must not be made in sustained winds <br />� greater than 12 miles per hour or in precipitation. <br />D. Measurements must be made using a windscreen. <br />Subp. 5. Methods for determination of hourly LeQ. For the <br />determination of an hourly LeQ, measurements must be made using <br />the measuring devices as required under subpart 2 and used <br />according to the manufacturer's recommendations. . <br />A, Hand held measuring devices must use the checkoff <br />method described in FHWA-DP-45-1R, section 3.6 (August 1981) for <br />determination of hourly LeQ• <br />B, Automated or integrating measuring devices may use <br />the checkoff method described in FHWA-DP-45-1R, section 3.6 <br />(August 1981) or be operated in accordance with the <br />~ manufacturer's recommendations for determination of hourly Leq. <br />r <br />C. Methods equivalent to those described in subpart <br />5, items A and B may be used provided they are approved by the <br />director of the Minnesota Pollution Control Agency. <br />Stbp, 6. Calculation of Ldn. Ldn shall be calculated <br />using the following formula; L /10 L +10/10 <br />Ldn = 10 log10 1/24 [(15 x 10 d ) + 9 x 10 n l <br />where <br />■ Ten times the 1og10 of the sverage Pnergy for the <br />Ld <br />hours from 7:00 a.m. to 10:00 p.m. <br />L ■ Ten times the 10910 of the average energy for the <br />n <br />hours from 10:00 p.m. to 7:00 a.m. <br />Subp. 7, Data documentation. A summary sheet for all <br />sound level measurements shall be completed and signed by the <br />7 <br />