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Item No. 3 BA: 11-12-81 F:P-81-9/EIR-81-5 Page 7 Local atmospheric conditions will also be affected by the dust produced during the project. Dust will be released as aggregate is removed, materials are transport6d, processed, and used in the batching plants. Mitigation : An acoustical study by the Local Health District is warranted to determine the actual noise exposure level at the residence just west of the excavation area and to evaluate the effective- ness of alternative measures--such as screening--that can be implemented to reduce noise to a decibel level compatible with the residential use. The noise nuisance could also be reduced by limiting the actual hauling activity to specified daylight hours within the work day. Emissions related to earth moving and aggregate hauling are unavoidable impacts that cannot be mitigated given present technology. The applicant will maintain a water truck on the work premises to sprinkle earth surfaces, including unpaved work routes used by the excavation equipment and excavation surfaces prior to actual excavation. Additionally, stockpiled materials, including overburden, should be sprinkled often enough to prevent dust and dirt drifts caused by wind. Processing of aggregates, particularly rock crushing, will require continuous applications of water to control dust. Dust along the dirt access road could be controlled by requiring that this route be paved. The materials could be provided by the proposed batching plants. Particulate matter emissions are regulated under the permit authority of the County Air Pollution Control District. Conditions--such as the requirement of on-site monitoring instruments and regular, emission reports--could be added under APCD permit procedures. 2 , Impact: Consumption of Nonrenewable Resources and Secondary Impacts Resulting from the Alteration of Topography Aggregate deposits take thousands of years to accumulate and only a relatively short period of time to exhaust. In this sense, the resources removed during this project are considered non- renewable. Positive impacts of this project relate to social and economic effects. The excavation will enable additional construction and growth in the residential, commercial, and industrial sectors of the local economy. If new excavation sites are to be