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Table 5.11-4. Estimate of Total Suspended Particulates (TSP) Emitted from Grading and Wind Erosion <br /> Emission Source Acreage Duration (months) Unmitigated TSP (tons) Mitigated TSP (tons) <br /> Grading Dust: <br /> Project Site 4.40 2 0.151 0.053 <br /> Laydown Areas (A through D) 9.80 1 0.108 0.059 <br /> Gas Supply Pipeline 1.21 3 0.382 0.134 <br /> Transmission Line Pole Holes 0.000 0.00 0.000 0.000 <br /> Wind Blown Dust: <br /> Project Site 4.40 22 0.307 0.107 <br /> Laydown Areas (A through D) 0.00 23 0.000 0.000 <br /> Gas Supply Pipeline 9.09 3 1.170 0.410 <br /> Transmission Line Pole Holes 0.000 0 0.0000 0.0000 <br /> Estimated Total 2.118 0.763 <br /> Notes: <br /> All linear feature impacts noted above are for portions outside of the project areas footprints. <br /> Project Assumptions: <br /> Grading for project site will be completed in a 2 month period and construction will extend an additional 18 months. <br /> Grading for laydown will be completed in a 1 month period and the site will be covered (gravelled or paved) immediately. <br /> No new excavation for transmission line pole will be required <br /> Approximately 1/10th of the project site has bare soil exposure during the length of the construction period. <br /> Water and sewer line connections will be on site. <br /> The gas supply line will be 2.6 miles long and installed along roadway rights-of-way in a 4-ft trench with 30-ft construction corridor. <br /> Data Sources: <br /> a PM10 Emission Factor Source: Midwest Research Institute, South Coast AQMD Project No. 95040, Level 2 Analysis Procedure, March 1996 <br /> b PM10 to TSP Conversion Factor Source: Bay Area Air Quality Management District CEQA Guidelines, Assessing the Air Quality <br /> Impacts of Projects, December 1999. <br /> SCAQMD CEQA Handbook (1993) Table 11-4 for mitigation efficiency rates (as summarized in Table 8.9-4) <br /> 9/2/2008 <br />