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El Rancho Rock and Sand, Inc. Quarry <br /> NOISE STUDY <br /> APRIL 10, 1991 <br /> Prepared by: <br /> John Pradenas <br /> Manager of Environmental Technical Services <br /> Condor Minerals Management <br /> P.O. Box 3905 <br /> Sonora, Ca. 95346 <br /> (209) 552-0361 <br /> CONDOR <br />