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%W. ,.W The existing noise environment in the project area is defined by traffic on Macarthur Road and operations at the existing Teichert rock plant. Other noise sources in the project vicinity include occasional WPRR operations and aircraft activity at the nearby San Joaquin County Airport. To quantify existing noise levels in the project vicinity, noise monitoring was performed for a period of 10 minutes at the proposed excavation site on June 14, 1990. Noise measurement equipment consisted of a Larson-Davis Laboratories (LDL) Model 800B precision integrating sound level meter. The equipment was calibrated before use, and meets all pertinent specifications of the American National Standards Institute (ANSI) for Type I sound level measurement systems. The results of the ambient noise measurements are shown in Table I . TABLE I Ambient Noise Measurement Results Proposed Rose Harvesting Site: June 14, 1990 r-- Sound Level , dB Location Time Leq Lmax LID L50 L90 100' E. of Macarthur 12:40pm 58.8 70.0 60.8 57.5 55.5 _ The results of the ambient noise measurements indicate that the project site noise levels are typical for areas affected primarily by surface traffic and industrial operations. There are currently no significant existing noise sources on the project site which contribute to the ambient environment in the area. ANALYSIS OF PROJECT RELATED NOISE LEVELS: Noise measurements and accepted noise modeling techniques were used to predict noise levels generated by the proposed excavation operation. Operational information for excavation at the Rose site was developed from discussions with Teichert staff and from BBA file data. For conservative estimates of noise generation, it was assumed that the 988B front loaders would be in continuous operation during any given hour, and at any location on 2