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U e) A!1 inactive portions of the site shall be seeded and watered until vegetation } 1 is established or shall be treated with dust-retarding lignins or aggregate . material not readily eroded by the wind. t) On-site vehicle speeds shall be limited to 15 MPH. g) The excavatorshall use either water or petroleum-based palliatives as a dust control measure. The use of petroleum-based palliatives shall meet the road oil requirements of the San Joaquin Valley Unified Air Pollution Control - District's Rule 409.5: "Cutback Asphalt Paving Materials." h) The portions of Bird Road and Blewett Road adjacent to the excavation area and the entrances to the processing plant shall be swept whenever there is visible dirt in order to remove silt that may have accumulated from construction or excavating activities. I LSI i) Gravel strips or wheel washers shall be installed where vehicles enter and exit unpaved roads onto paved roads. I Level of Significance After Mitigation: �! As indicated in Table 4.5-4, the initial construction hase would generate P approximately 671 lbs/day of PM,o (uncontrolled emissions). Application of Mitigation Measure 4.5-1a would reduce fugitive dust impacts (to approximately 337 lbs/day), but not to a less-than-significant level. Therefore, the temporary construction-related, fugitive dust emission impact for Alternatives 1, 2 and 3 would be significant and unavoidable. Impact 4.5-2 Regional Operational Emissions All Quarjry Excavation Alternatives (1. 2. and 31 The mining and reclamation activities proposed by Alternatives 1, 2, and 3 are identical (as described in Chapter 3) and would involve: excavation, removal, and storage of topsoil and C subsoil layers from the project site; the removal of aggregate from the project site; the !�I transport of excavated materials to and from the processing plant; the subsequent grading and reapplication of blended topsoil and subsoil layers to the project site; and the revegetation of the project site. Based on project operating throughput, it is estimated that mining and reclamation activities at the project site would typically require the operation of one scraper and one loader, operating eight hours per day, 200 days per year (Dessert, 1997). Equipment types, trip lengths, and plant operations would also be substantially similar for the three alternatives. While the level of activity may vary from year to year, this represents a reasonable scenario for the analysis of air quality effects. The hours of quarry operation are anticipated to occur regularly five days a week between 5:00 Ann and 4:00 Pm. Draft Environmental Impact Report 4-72 ER-96-3