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Information given by the applicant is that there will be a maximum of 90 haul trips per day for a work year of 220 days, and with an average round trip distance of 60 miles. The estimated annual exhaust emissions stated in Table II are based on the rates established by the Air Resources Hoard for heavy-duty diesel trucks iranufactured between 1973 and 1976 : Hydrocarbons 4.5 grams/mile Carbon Monoxide 27.0 grams/mile Nitrogen oxides 20. 1 grams/mile Particulate VMtter 1.96 grams/mile Local atmospheric conditions will also be affected by the dust produced during the project. Dust will be released as aggregate is removed, materials are transported, pro- cessed, and used in the batching plants. Dust problems occur r.-ainly in the Months from may through October when there is little likelihood of rain and when hot temperatures dry the ground and create dust. The dust will not have a significant effect on vegetation in the vicinity. Mitiaativ • - Conformnnce to work standards administered by the occu- pational Safety and Health Administration (OSHA) will mitigate the noise conditions to which employecs will be exponcl; for example, arproved ear plugs will ho required to be wcrn. An acoustical study by the Local Health District may be war:r ntcP to determine the actual noise exposure level at the res.iden :e just west of the ercavaticn area and to evn2v vc the effectiveness of alternative measures--such as fencing--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 clay. In addition, there has bco n so a mention by the applicant that the truck scales will be open to the general truchizng public. This would obviously increase truck traffic in the immediate vicinity, an inpact which could bo avoided by restricting use of the scales to customer: hauling materials from the site. 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, stocY- pil.ed materials, including overburden, should be sprinh1cf, often enough to prevent dust and dirt drifts caused by wing. Processing of. aggregates, particularly rock crushing, -19-