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— SEP-22-'92 TIDE: 08:i9M Y D J LIVAPCD SJZOi�E TEL N0,209 943-'7248 #1833 P03 ,j i Suggested Air duality Dust Mitigation Measures ffor construction Sites/ Pre-construction-Emissions generated during the pre,-construction process are of a concm to the District. The following dust control practices should be implemented: as All material excavated or graded should be sufficiently watered to prevent excessive amount of dust. Watering should occur at least twice a day with complete coverago, preftabiy in the late morning and after work is done for the day. s All clearing. grading. earth moving, or excavation activities should cease during periods of high wlnds greater than 20 mph average over one hour. yr All material transported off-site should be either sufficiently wa=ed or securely covered to prevent excessive amounts of dust. td The area disturbed by clearing, earth moving, or excavation activities should be minimized at all times. PD, The developer should mow, instead of disking, for weed control, thereby leaving the ground undistur ed and with a mulch covering. During Construction - After clearing, grading, earth moving, or excavation operadon4, during the construction phase. fugitive dust emissions should be controlled by the following methods: >P All inactive portions of the construction site should be seeded and watered until grass growth is evident. All active portions should be sufficiently watered to prevent excessive amounts of dust. Qerlersi rugitive Dust - At all times. fugitive dust emissions should be oontrolled Using the following procedures: s- -On-site vehicle speed should be limited to 15 mph. All area with vehicle traffic should be watered periodically or have petroleum-based palliatives' applied for Stabilization of dust emissions. s Streets adjacent to the project site sbould be swept at least once pec day to remove silt which may have accumul4W from construction activities. D ' Build a paved "apron" into project from ajoining paved roadways. Ozone Precursors-At all times. ozone precursor emissions should bo controlled by the following methods: i 0- All intarn,al combustion engines driven equipmea should bo properly maintained and well tuned according to manufacturer's speciftcations. of During the smog season (May through October), the conaruction period should be leagtbemed so as to minimize the number of vehicles and.equipment operating at the same time. SMAPl9 89642 f Use of petroleum-based palliatives shell meet the road oil requirements sof the DfsWct's Rule 409.6- Cutbsck Asphalt PBvinp Materiels.