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SHININGTREE <br /> Ms. Karla Kuhl July 7, 2005 <br /> Assistant Planner <br /> Cormmunity Development Dept. <br /> San Joaquin County <br /> 1810 E. Haaehon Ave. <br /> Stockton, CA 95205 <br /> (209)468-3103 P(209) 468-3163 <br /> Re: Quarry Application PA-0500403(QX) <br /> Dear Ms. Kuhl: <br /> In response to your question regarding scraper noise from the aforementioned project we <br /> tender the following cottuuents. <br /> County Table 9-1025.9 specifies noise significance levels for residential uses as 65 dBa <br /> I dru. The scraper described for this project (CAT 623) has a noise curve, which we <br /> developed and have on file_ If we assume night time noise levels as 50dBa I eq the <br /> CAT 623 scraper operating no closer than 300 feet in direct line of sight of the nearest <br /> residence would fall under the county standard of 651A& If topography or earthen berm <br /> breaks line of sight, the scraper could operate as close as 100 feet and still meet the <br /> standard in Table 9-1025.9. <br /> e y, <br /> Don Deem REA#53 <br /> RG#4199 <br /> Environmental Services • RO, Box 1975 - Murphys, GA 95247 0 (209)728.2519 0 Fax (209)728-2533 a Earth Sciences <br />