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Item No. 8 <br /> BA : 8-27-81 <br /> EP-81-9/EIR-81-.5 <br /> Page 7 <br /> Local atE.ospheric conditions will also be affected by the dust <br /> produced during: tlhe project. Dust will be released as aggregate <br /> is removed, mate-rials are transported, processed, and used in <br /> the batching plants. <br /> Mitigation : <br /> An acoustical, study by the Local Health District is warranted <br /> to determine the actual noise exposure level at the residence <br /> just west of the excavation area and to evaluate the effective- <br /> ness of alternative measures--such as screening--that can be <br /> implemented to reduce noise to a decibel level compatible with <br /> the residential use. <br /> The noise nuisance could also be reduced by limiting the actual <br /> hauling activity to specified daylight hours within the work day. <br /> Emissions related to earth moving and aggregate hauling are <br /> unavoidable impacts that cannot be mitigated given present <br /> technology. <br /> The app!-Lcant W4 ]_t maintain a water truck on the work premises <br /> to sprinkle earth surfaces, including unpaved work routes used <br /> by the excavaL..ion equzpmQnt and excavation surfaces prior to <br /> actual ex�.:avati:jn . Additionally, stockpiled materials, including <br /> overburden, should be sprinkled often enough to prevent dust and <br /> dirt drifts causel b• % i..nd.. Processing of aggregates, particularly <br /> rock crushing, wz.11 require continuous applications of water to <br /> cont. -ol dust. Dust along the dirt access roar. could be controlled <br /> by requiring tha4 this rcute be paved. The materials could be <br /> provided bl `he l)roposcd batching plants. <br /> Particulate matter emissions are regulated under the permit <br /> authority of the County ?lir Pollution Control District. <br /> Conditions--such as the requirement of on-site monitoring <br /> instruments and regular, emission reports--could be aaaed under <br /> APCD permit procedures. <br /> 2 . Impact: Corzsumptio , of Nonrenewable Resources and Secondary <br /> Impacts Resulting from the Alteration of Topograp_y <br /> Aggregate deposits take thousands of years to accumulate and <br /> only a relatively short period of time to exhaust. In this sense, <br /> the resources removed during this project are considered non- <br /> renewable. <br /> Positive impacts of this project relate to social and economic <br /> effects. The excavation will enable additional construction <br /> and growth in the residential, commercial, and industrial sectors <br /> of the local economy. If new excavation sites are to be <br /> AA-7 <br />