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[I <br />6. Noise <br />Thr prnject is exposed to relatively high noise peak; <br />the i:raffic on Casino Road and on Highway 526, <br />,rom <br />,aainly peak -hour r-mmuting traffic to and from the <br />Boeing plant and djace,t indus�:y. oise peaks adjacent <br />526 near the Hardeson Read undercrossing hay.2been <br />to <br />monitored at an L10 level at 75 to 79(L10) <br />4,40 vehficicles <br />1978 average daily traffic of 14,440 <br />combined leve Is <br />(10,200 on SR-526; 4240 on Casino Road). <br />for 1984 are predicted at double that figure (23,110 on <br />SR-526; 5680 on Casino Road). Audible traffic noise at <br />the site during the PM peak hour suggests that the noise <br />from Highway 526 is largely mitiga:ed, at this point, <br />by its relative elevation above the site, as well as <br />distance (600 feet from the north site boundary). tie <br />gation from distance alone would be at - <br />Although noise levels at the site are not presently avail- <br />the City of Everett will monitor existing peak hour <br />" <br />able, <br />levels along the north edge of the site. This will <br />noise <br />allow prediction, related to projected traffic levels, <br />of noise levels on the site. Noise mitigation through <br />3 <br />of a landscaped earth berm along the north <br />construction <br />oro ect sponsors. <br />boundary is being considered by j <br />site <br />be aided by site topography which could, with <br />This will <br />be <br />little modification, allow building1�-15sfaet. <br />Construct <br />below adjacent street elevation by <br />yj <br />tion of berms on the site perimeter can thus give line- <br />of -sight visual and noise screening for the majority of <br />s ,-• <br />units. <br />Additional noise mitigation will be provided by building <br />construction. Double -wall construction <br />orientation and <br />