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<br />Ir~r. Dale ?e am <br />Cooley Gravel Com_nany <br />20 ilarch 175 <br />age 17 <br />diesel trucks have a noise level <br />depending on vrind direction and <br />is the greatest problem since it <br />bacl;;;round noise level. <br />In the absence of quarr,~,JJine ~-he backg-roLU7d noise level on the <br />Cooley rorerty (Site A), at tiie corner of Forest: and Vine <br />(Site ~~, 2nd at Site i; was Y4 decibels. 'The bac;.;;round noise <br />level at the '{i;*h::'ay Depar';rient Statior. (Site C) :•~as ~.6 <br />decibels, v:hile the I•:ountair. narks Site (Site u) had a level <br />of 45 decibels. T;~ere was no change in bac;:~-rovnd noise <br />levels at the nearest residence (Site i) and pui;lic buildir. <br />(Site C) due to quarry operations. Sites A and E sho:•red <br />increases of bet~::een mine and thirteen decibels due to their <br />being in the vicinity of the quarry. Site D only 150 feet <br />from the r,.ain quarry activity sitcwed the highest level of <br />noise v:hich fluctua+,ed betvreen 4B and 66 db.~ Dne to the <br />lame fluctuations in activity at this location, there is no <br />~:-eli defined bacl:grour.d level,r~owever, the average noise <br />level is 5° db ~:rith 90,= of the noise valves in the range of <br />52 to 64 db using the fast instrument response. <br />Background <br />noise level <br />(without quarry <br />Site operating) <br />A 44 db <br />B 44 db <br />C 46 db <br />D 45 db <br />E 44 db <br />Background <br />noise level <br />(quar.ry operating) <br />54-57 db <br />44 db <br />46 db <br />- db <br />53-55 db <br />Distance from <br />@uarry Operation <br />500 ft. <br />2/3 mi. <br />1/2 mi, <br />150 f•t. <br />1/4 mi. <br />Figure 3 shows the noise obtained from a quarry blast as <br />measured at the nearest residence. This blast eras large by <br />Cooley standards vrith a total of 4000 lbs. AFIJO and three <br />delays of several milliseconds in length. The blasting vras <br />audible at ti:e nearest residence, however, the sound was not <br />unli}:e that of a hunter's shot, The first shot had a noise <br />level of 5S db while the other two were only 55 db. It <br />should be noted that the wind reached a slightly higher noise <br />u <br />pea:: bete;een 64 and 71 db <br />strength. The wino -toi.se <br />thoroughly obscures tiro <br />