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18 <br /> <br />In addition to these measures, we also recommend that the Project implement the following mitigation <br />measures, called “Enhanced Exhaust Control Practices,”46 that are recommended by the Sacramento <br />Metropolitan Air Quality Management District (SMAQMD): <br />1. The project representative shall submit to the lead agency a comprehensive inventory of all off- <br />road construction equipment, equal to or greater than 50 horsepower, that will be used an <br />aggregate of 40 or more hours during any portion of the construction project. <br />• The inventory shall include the horsepower rating, engine model year, and projected <br />hours of use for each piece of equipment. <br />• The project representative shall provide the anticipated construction timeline including <br />start date, and name and phone number of the project manager and on-site foreman. <br />• This information shall be submitted at least 4 business days prior to the use of subject <br />heavy-duty off-road equipment. <br />• The inventory shall be updated and submitted monthly throughout the duration of the <br />project, except that an inventory shall not be required for any 30-day period in which no <br />construction activity occurs. <br />2. The project representative shall provide a plan for approval by the lead agency demonstrating <br />that the heavy-duty off-road vehicles (50 horsepower or more) to be used in the construction <br />project, including owned, leased, and subcontractor vehicles, will achieve a project wide fleet- <br />average 20% NOX reduction and 45% particulate reduction compared to the most recent <br />California Air Resources Board (ARB) fleet average. <br />• This plan shall be submitted in conjunction with the equipment inventory. <br />• Acceptable options for reducing emissions may include use of late model engines, low- <br />emission diesel products, alternative fuels, engine retrofit technology, after-treatment <br />products, and/or other options as they become available. <br />• The District’s Construction Mitigation Calculator can be used to identify an equipment <br />fleet that achieves this reduction. <br />3. The project representative shall ensure that emissions from all off-road diesel-powered <br />equipment used on the project site do not exceed 40% opacity for more than three minutes in <br />any one hour. <br />• Any equipment found to exceed 40 percent opacity (or Ringelmann 2.0) shall be <br />repaired immediately. Non-compliant equipment will be documented and a summary <br />provided to the lead agency monthly. <br />• A visual survey of all in-operation equipment shall be made at least weekly. <br />• A monthly summary of the visual survey results shall be submitted throughout the <br />duration of the project, except that the monthly summary shall not be required for any <br />30-day period in which no construction activity occurs. The monthly summary shall <br />include the quantity and type of vehicles surveyed as well as the dates of each survey. <br /> <br />46http://www.airquality.org/ceqa/Ch3EnhancedExhaustControl_10-2013.pdf