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4.4 NOISE <br /> TABLE 4.4-1 <br /> 10-MINUTE NOISE MEASUREMENTS <br /> OCTOBER 29, 1991 <br /> (see Figure 1) <br /> j Time <br /> L.x anon Description Starting LI Lm.2 Lm;o L013 L1e Ls0 L90 Comments <br /> 1 50 ft. from 9:30 am 41 46 36 45 42 40 38 No traffic on <br /> Forest Lake Forest Lake <br /> Road Rd.;two jet <br /> aircraft at 44 <br /> and 46 dBA. <br /> 2 200 ft. from 10:15 am 40 42 38 42 42 40 39 Sounds of birds <br /> Forest Lake and tree leaves <br /> Road blowing in the <br /> ` wind. <br /> 3 North side of 12:15 pm 32 43 27 40 34 30 29 Sound of a slight <br /> Mokelumne River breeze and <br /> singing of birds. <br /> I Leq -- The average A-weighted noise level during the measurement period (Appendix Q. <br /> Z Lm. -- The maximum A-weighted noise level during the measurement period. <br /> 3 Lot, Lto, L50 L90--The A-weighted noise levels that are exceeded during the measurement period <br /> 01, 10, 50,and 90 percent of the time, respectively. The L., and L90 noise levels are also known <br /> as the median and background noise levels, respectively. <br /> 4.4-3 <br />