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z pa%kIAf SAN .IOAQUIN COUNTY ; r ,y COMMUNITY DEVELOPMENT DEPARTMENT 1810 E.HAZELTON AVE.,STOCKfON.CA 95205.8232 • '�F PHONE:2091488-3121 FAX:2091488-3183 May 10, 2002 MEMORANDUM TO: Development Committee FROM: Jennifer Jolly Associate Plan e SUBJECT: REVISION OF APPROVED ACTIONS APPLICATION FOR QUARRY PERMIT QX-96-1 OF DSS CONSTRUCTION (CIO JOSE L. ALVA)(APN: 265-090-4, 5, & 6) The applicants are proposing to change the hours of operation of a previously approved quarry (QX-96-1). The quarry currently operates during the hours from 5:00 a.m. to 9:00 p.m. The proposed revised hours of operation are from 1:30 a.m. to 5:30 p.m. The revision does not increase the total number of hours the quarry may operate within a 24- hour period. The applicants are requesting to revise the hours to take advantage of off- peak electrical rates. The site is located on the west side of Koster Road, 2,100 feet south of Blewett Road, southeast of Tracy. The site is designated OS/RC (Open Space Resource Conservation) and AIG (General Agriculture) in the General Plan and is zoned AG-40 (General Agriculture-40 acre minimum). Noise Study � Bollard & Brennan, Inc. prepared an environmental noise assessment to determine whether or not the rescheduling of the quarry's hours of operation would adversely affect the existing residences in the project vicinity. t The study concluded that, with the mitigation measures listed below, noise impacts could be reduced to a less than significant level during early morning/nighttime mining and processing operations: • Aggregate stockpile locations should be maintained at their current positions as those stockpiles provide partial shielding of processing area noise to the nearest residences to the east and south. Early morning/nighttime mining activities within 600 feet of any residence should ' not occur unless that equipment is recessed at least 40 feet within the pit so as to be substantially shielded from that residence. F a