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INTRODUCTION Inspiration Resources' E1 Rancho Quarry is a 225 tons per hour aggregate processing plant. The facility is located in San Joaquin County off Waverly Road. E1 Rancho is presently permitted to operate at a capacity of 5000 tons/day of process material. The maximum allowable haulage off site is 42 trucks per day peak, 21 trucks per day average. Inspiration Resources intends to continue mining in areas already permitted and to also expand to the remainder of their leaseholding south of the current operation. The plant capacity will also be increased to 350 tons per hour, 25,200 tons per week, with a maximum anticipated haulage of 100 trucks per day peak, 80 trucks per day average. The purpose of this study is to determine the noise impacts associated with the mining of the southerly property and with the increasing truck traffic to a maximum of 100 per day. In order to avoid underpredicting impacts maximum operating conditions (trucks/day) have been assumed although actual will likely be less. METHODOLOGY Noise Sources Three distinct operations produce noise from the El Rancho Quarry operations. Primary is processing of the aggregate at the plant, including initial charging of the circuit using a front-end loader. The second noise source is the hauling of product off site by the use of highway legal trucks. The third source is the mining and stockpiling of ore. The three sources listed operate independently of one another. Under most conditions the sources are far enough from one another that one source does not add significantly to the impact of the other source. This is true due to the logarithmic nature of noise as measured on the dB scale. If one source is ten decibels louder than an adjacent source the measure or projected levels can safely be assumed to be the effect of only the louder source. Noise Emission Data Noise Emission Data(NED) for Source one, the plant, was derived by actual field measurements of the source operating at normal conditions and rates. A Bruel and Kjaer (B&K) model 2231 Integrating Sound Level Meter (SLM) equipped with an option octave band filter set was utilized. 1 CONDOR