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In addition to these measures, we also recommend that the Project implement the foibowing mitigation measures, called "Enhanced Exhaust Control Practices;`"` that are recommended by the Sacramento Metropolitan Air Quality Management District (SMAQMD): 1. The project representative shall submit to the lead agency a comprehensive inventory of all off - road construction equipment, equal to or greater than SO horsepower, that will be used an aggregate of 40 or more hours during any portion of the construction project. • The inventory shall include the horsepower rating, engine model year, and projected hours of use for each piece of equipment. • The project representative shall provide the anticipated construction timeline including start date, and name and phone number of the project manager and on -site foreman. • This information shall be submitted at least 4 business days prior to the use of subject heavy-duty off -road equipment. • The inventory shall be updated and submitted monthly throughout the duration of the project, except that an inventory shall not be required for any 30-day period in which no construction activity occurs. 2. The project representative shall provide a plan for approval by the lead agency demonstrating that the heavy-duty off -road vehicles (SO horsepower or more) to be used in the construction project, including owned, leased, and subcontractor vehicles, will achieve a project wide fleet - average 20% NOX reduction and 45% particulate reduction compared to the most recent California Air Resources Board (ARB) Heetaverage. • This plan shall be submitted to conjunction with the equipment inventory. • Acceptable options for reducing emissions may include use of late model engines, low - emission diesel products, alternative fuels, engine retrofit technology, after -treatment products, and/or other options as they become available. • The DistricPs Construction Mitigation Calculator can be used to identify an equipment fleet that achieves this reduction. 3. The project representative shall ensure that emissions from all offroaddiesel-powered equipment used on the project site do not exceed 40% opacity for more than three minutes in any one hour. • Any equipment found to exceed 40 percent opacity (or Ringelmann 2.0) shall be repaired immediately. Non -compliant equipment will be documented and a summary provided to the lead agency monthly. • A visual survey of ail in -operation equipment shall be made at least weekly. • A monthly summary of the visual survey results shall be submitted throughout the duration of the project, except that the monthly summary shall not be required for any 30-day period in which no construction activity occurs. The monthly summary shall include the quantity and type of vehicles surveyed as well as the dates of each survey. "6huo,llwww.ai mua Iltv:orcloea a/Ch3 E nha ncedExhaus iControl 10-2013:odf 1S 42 75C-186