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III. ENV IRON'14 I aAL CONSIDERATIONS <br /> The Initial Study stages that this project may have c signi- <br /> ficant effect on tl,.(,- <nvironment. The impacts and corresponding <br /> mit-i ati.cr, measures addressed in thio rection are- <br /> . <br /> Air Quality: Dta t, Noise, Truck E., ,ayst Fn:;ssians <br /> . Consumption of Nonrenewable Resources and Secondary <br /> Impacts Related to t7ne Alteration o': Tcr)ograr7vy <br /> . Traffic Considerations : Road Capacity and Maintenance, <br /> Traffic Vol..ure, Site Access <br /> A. Air Quality. Noise, Dust, Truck Emissions <br /> Daily excavation operations will produce significantly <br /> high noi. e levels in the _J=ediate environment. Noise <br /> sources include heavy►-duty, diesel equip.TT rit; processing <br /> operations, batching plants ; and haul try^ks. The noise <br /> levels associated with these various sources will approx- <br /> imate CO-90 decihn s WE7�) at a distance of 50 feet. .1-t- <br /> is <br /> .`i.s :ell-establishcd t?zat- noise levels this high contribute <br /> to hearing less in. humtans worhinc, near_ the noise source. <br /> A significant voice impact- cut:ice the irmediate we-]'. site <br /> will by cn the resid..ence locate e.bont 208 yarOs wast of <br /> the wort; site. F:c^ccs to th.,-,, cite is just south of this <br /> resi.denco c-A wa orl.K- read so that hat-tl trucks will have <br /> to pass t!*e 'house for ingress ane? eg::ess ptarposes. Tn <br /> addition, the res i.dcnee will bo exposed to noise frc:1 <br /> earth mcvinv c:z°t. . ., moat operating in t!*c wost-crn i vrticn:� <br /> of the c::'^tE°aticn area. The m-�xr;"um acccntable noise <br /> level for the er-:tcri.c:: of a residence is T�..e� . >~�l.s (dBA) . <br /> %, 'o lcvo! •Till b�e c.:c;ccd.cd key -*Lpropcseci exc°avat:.on. <br /> San aoa^ui.rn Cou.nty, has been dcsignated a Non-Attainment <br /> Area because it; does net nc-et t�.e air quality standards <br /> set forth in the vmcad.c l Clc n Air Act of 19x7. Currently, <br /> the County ic, rcvisi,*^c? its Ai'r 4luality Manager.ent Plan in <br /> order to bring the County in cc^pliance with federal <br /> standards by 19 37. in the hcniever, any air <br /> quality acgradat?cn catTcec', by ncw proje,�:;-s should be con- <br /> sidered si.; nific`nt b,:,th fc.- its adverse effe^ts on air <br /> quality ccnditiorc and for t7-ie detrimental effect it will <br /> have on efl.crts to attain federal. and;/or State standards. <br /> Ai-': quality d.ecarac!atien will result free the operation of <br /> truce-s used to transrort aggregate materials. Emissions <br /> will occur along haO_ routes ratl:c=: tl an at the project <br /> site. The truck emissions p::o4ectcd b:l,c.0 will be similar <br /> to the level of cm.issic-no essoci.ated with the applicant's <br /> present: c.:r a-vaticn operation at: the cal.a,�~eras River site. <br /> n,, is is cue. to the fact that there will be about the sate <br /> nunb�r of haul trips por day with a similar average <br /> round trip distance. <br /> -18- <br />