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Forward Landfill LFG Acoustical Analysis May 18, 2011 1 INTRODUCTION AND SUMMARY Page 1 Ameresco Forward LLC proposes to erect a gas -powered electrical energy generating facility on the existing Forward Landfill near Manteca, CA. Because surrounding noise sensitive uses are located within 2 miles of the project, the project proponent has requested that noise emissions from the facility be evaluated relative to San Joaquin County residential noise standards, 50 dB during the day and 45 dB at night (See Appendix A). The project has been found to comply with the noise standards by a wide margin. 2 PROJECT DESCRIPTION Figure 1 is an aerial photo of the project area, showing the project location and the nearest noise sensitive areas. The locations and elevations of the project and surrounding uses are shown in Table 1. Table 1. Distances and Elevations from Site to Off -Site Uses Identification Distance ft . Elevation ft Project Site - 42 AMSL Non -Res. to S 1,940 +0 Res. to N 39320 +0 Res. to N 6,160 +0 Res. to SE 1 6,900 1 +0 Res. to SSE 8,100 +0 Prison to NW 2,930 +0 The project is stated to be similar to the Ameresco Keller Canyon facility in Contra Costa County, with the exception that different muffler types are to be used for the generator engines. The Keller Canyon Site Plan is shown in Figure 5. Relative to the orientation on the Forward site, North is rotated 1800 degrees to east. Note that the major noise producing equipment is in an enclosed building. The project consists of two gas -powered electrical generators, with associated pumping and filtering equipment used to recover landfill gases. The major noise -producing equipment — generators and positive displacement blowers - are located in sound - attenuating enclosures and the generators are equipped with critical -grade exhaust silencers to minimize noise. Manufacturers' noise emissions ratings for major pieces of equipment are shown in Table 2