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SALEM COURTHOUSE SQUARE, INC. <br />DEMOLITION <br />1997 <br />limitations: <br />SECTION 01568 <br />ENVIRONMENTAL <br />PROTECTION <br />PAGE 4 OF 5 <br />1. Repetitive, high level impact noise will be permitted only between 8:00 a.m. and 6:00 p.m. <br />unless otherwise permitted by local ordinance or the ordinance or the Owner or Owner's <br />Representative. Repetitive impact noise on the property shall not exceed the following db <br />Time Duration of Impact Noise Sound Level in db <br />More than 12 minutes in any hour 70 <br />Less than 30 seconds of any hour 85 <br />Less than three minutes of any hour 80 <br />Less than 12 minutes of any hour 75 <br />2. Provide equipment, sound-deadening devices, and take noise abatement measures that are <br />necessary to comply with the requirements of this contract, consisting of, but not limited to the <br />following: <br />a. Maximum permissible construction equipment noise levels at 50 feet (dba) <br />EARTHMOVING <br />MATERIALS HANDLING <br />FRONT LOADERS 75 CONCREI'E MIXER 75 <br />BACKHOES 75 CONCRETE PUMPS 75 <br />DOZERS 75 CRANES 75 <br />TRACTORS 75 DERRICKS IMPACT 75 <br />SCRAPERS 80 PILE DRIVERS 95 <br />GRADERS 75 JACK HAMMERS 75 <br />TRUCKS 75 ROCK DRILLS 80 <br />PAVERS, STATIONARY 80 PNEUMATICTOOLS 80 <br />PUMPS 75 SAWS 75 <br />GENERATORS 75 VIBRATORS 75 <br />COMPRESSORS 5 <br />b. Shields or other physical barriers to restrict the transmission of noise. <br />c. Soundproof housings or enclosures for noise-producing machinery. <br />d. Efficient silencers on air intakes for equipment. <br />e. Efficient intake and exhaust mufflers on internal combustion engines that are maintained to <br />have equipment perform below noise levels specified. <br />f. Lining of hoppers and storage bins with sound deadening material. <br />g. Conduct truck loading, unloading and hauling operations so that noise is kept to a <br />minimum. <br />3. At least once every five successive working days while work is being performed, above 55 dba <br />noise level, measure sound level for noise exposure due to the construction. Measure noise <br />exposure at the property line or _50 feet from the noise source, whichever is greater. Measure <br />the sound levels on the A weighing network of a General Purpose sound level meter at slow <br />response. To minimize the effect of reflective sound waves as buildings, measurements may <br />