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Analysis Background On April 6, 1995, the Planning Commission certified Environmental Impact Report ER-94-1 as adequate and approved Quarry Excavation Application No. QX-94-2 to expand the limits of an existing permittedi. quarry(QX-86-1). The existing quarry operation encompassed approximately 110 acres. The proposed expansion added an additional area of 938 acres, for a total area under permit of 1,048 acres. Of the 1,048- acre total area, the actual acreage to be excavated was 500 acres. The Revisions of Approved Actions application originally requested to modify Community Development Department's Conditions of Approval No. 1.g., regarding the hours of operation, and 1.m., regarding the final slope. The applicants have since withdrawn the request to change the hours of operation. Condition No. 1.m.currently states that the final cut and/or fill slopes shall not exceed three (3)feet horizontal to one(1) foot vertical. The applicants are proposing to modify the condition of approval to state that the final cut and/or fill slopes shall not exceed two(2)feet horizontal to one(1)foot vertical. The standard ordinance requirements for quarries, as specified in Development Title Section 9-1415.3(k [6]), indicate that the final cut and/or fill slopes shall not exceed two (2) feet horizontal to one(1) foot vertical. Development Title Section 9-1415.3(k [3]), Slope Modification Requirement, states that the Review Authority may require slopes flatter than those specified below for safety or aesthetic purposes if the proximity of the residential and other urban uses, waterways or roads, the instability of materials, or the surrounding terrain so warrants. The three (3)to one (1)final slope condition of approval was required for QX-94-2, for aesthetic purposes. The site and surrounding lands are agricultural (rolling hills) and used for cattle grazing. The three (3)to one (1) final slope is less steep than the two (2) to one (1) final slope, therefore resulting in more natural terrain after the site is reclaimed. As a point of information, five(5) out of six (6) Quarry Excavation applications submitted and approved between 1984 and 1999 in ♦ !I the Clements area were approved with the condition that the final cut and/or fill slope shall not exceed the 2:1 ratio. Slope Stability Analysis Kleinfelder, Inc., prepared a slope stability analysis"to document that steeper slopes, similar to those used for all other aggregate facilities in San Joaquin County, could be used at the KRC plant." Kleinfelder, Inc., concluded that a proposed change to the Conditions of Approval is warranted and that a relatively high factor of safety is available for the proposed 2:1 reclaimed slope. Neighborhood Opl2osition The Community Development Department received six(6) letters and numerous phone calls of concern and opposition. The majority of the concerns are regarding the amount of traffic that will be generated as a result of the increased hours of operation. Originally, the Department of Public Works required a traffic study be prepared to identify any significant traffic impacts generated as a result of the proposed change in hours of operation. Similarly, the Community Development Department required a noise analysis be prepared to determine any significant noise impacts that could occur as a result of the change in hours of operation. However, since the applicants have withdrawn their request to modify the hours of operation, the Department of Public Works and the Community Development Department have determined that neither study is required. Any future expansion of the quarry may require a traffic study. San Joaquin County QX-94-21KRC Aggregates Community Development Page 3