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Analysis Back round r On September 4, 1997,the Planning Commission certified Environmental Impact Report No. ER—96-3 and approved Quarry Excavation hQ• QX� f material over a 56-year period. t due o t affic re a ed i-1 to remove 0ssues.tons oThe Board of Supervisors upheld This action was appealed by t pp roved aone- ear Time Extension on April the appeal on October 30, 1997. The Planning Commission app Y { 15, 1899. On July 11, 2000, the Board of Supervisors approved Resolution No. R-00-353 for a Revisions No. 1�u.(Wowed Actions application to modify Community Development Department Conditions of App referred to as 1.v.), regarding the pond levels and the relocation of the sedimen��i a! Nonds tonowreferr de of the project site during Phase 1. The application also added Condition of App Y. ( to as 1.z.)regarding the design of the proposed sedimentation pond dike• y i Land Use I property Koster Road borders the quarry oa�K 9{E�Road�ris a single-family residencet To the north ah is iland, and ded west is to e southeast, on the opposite side agricultural land, and to the southwest,on the opposite side of the California Aqueduct, are two single-family 4 residences. i Hours ofOperation The The applicants are proposing to change the hours of 6peration originally approved in hours of approved area 96 1. a.m. to currently operates from 5:00 a.m. and 9:00 p.m. proposed ' operating during the proposed hours,their electricity costs are . 5:34 p.m. The applicants state that by o reduced as well as the likelihood of rolling blackouts.e Qua rypExcav aeon peRwl would modify Conditions of Approval No. 1.g. and would add Condition 1 Bollard & Brennan, Inc. prepared an environmental noise assessment to determine whether the rescheduling of the quarry's hours of operation would adversely affect the existing residences in the project vicinity. The study concluded that, with the mitigaprn nglnighttimeion measu res istd below, noise impacts could mining and processing operations:e reduced o a less than significant level during early Aggregate stockpile locations should be maintained at their current positions, as those stockpiles ing area noise to the nearest residences located to the east and provide partial shielding of process south. Early morning/nighttime mining activities within 600 feet of any residence should not occur unless ' equipment is recessed at least 40 feet within the pit so as to be substantially shielded from that 4 I E residence. residences for ch i Overburden removal or initial mining activities in swithin 600i should be lmited othe the hou s#om 5'00 a.m to 5130 the mining equipment is not reces p p.m. I QX-96-11DSS Company San Joaquin County Page 3 Community Development I 1,