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Analysis Background The proposed quarry site has historically been used for agricultural purposes. The materials that are excavated from the site will be transported approximately 0.10 miles to an existing processing facility. The processing facility was originally approved in 1989 as part of a quarry that would operate for a twenty-year period. On March 4, 1999, the Planning Commission approved a Revision of Approved Actions for Quarry Excavation No. QX-89-2. The Revision added 30 years to the duration of the permit. Excavation The excavation of the site will be by the open pit method and will begin at the southeast corner of the property. tnfonT+aftf*subff,4ted to the Community Development Department indicates that the average excavation depth will be 35 feet, with a maximum depth of approximately50,feet. Theexc8vatian1V1tl.npi _ reach groundwater depth. Reclamation is proposed to be continuous and concurrent with mining. Almond or walnut trees will be planted in 15- to 30-acre increments as excavafion allows. The site witl-be approximately 25 to 40 feet lower than the current elevation when reclamation is complete. Pipeline A South San Joaquin Irrigation District pipeline is located in the center of the property proposed for the quarry excavation. In a letter dated October 7, 2002, the South San Joaquin Irrigation District indicated that District policy mandates that the owner be required to replace the existing pipeline with new reinforced concrete pipe and locate it along the outer perimeter of the excavation. The South San Joaquin Irrigation District's conditions will be incorporated into the Conditions of Approval for the proposed quarry. Noise The Community Development Department required that an acoustical study be performed to evaluate whether residences in the vicinity of the proposed quarry site would be exposed to noise levels from quarry equipment that would exceed the levels in the San Joaquin County Development Title. The Development Title requires that Residential use types have an outdoor activity area with a noise level of 65 dB Ldn. Deem Shiningtree Environmental Services preformed an acoustical analysis at an existing quarry excavation that was determined to be comparable to the topography and setting of the proposed quarry site. Based of the the acoustical study, a mitigation measure was proposed to ensure that the noise level at the property a proposed quarry would be below 65 db Ldn- The mitigation measure, which is also a Condition of Approval, states All existing and future residences shall have adequate (approximately eight feet tall with 2:1 slope) • berm placement to prevent line of sight to the quarry. Line of sight graphics shall be included with the Improvement Plan. Williamson Act The proposed quarry site is currently under Williamson Act Contract and is in the production of almonds. Development Title Section 9-1810.3(b)(1)(w] states that property under Willia SsonAcs d to be reclaimed to ontract may be d for quarry operations provided it is rehabilitated for agriculture. The property o p p agriculture by either being replanted in walnuts or almonds. Therefore, the proposal is consistent with the requirements of the Williamson Act and does not need to be removed from the Williamson Act in order to proceed with the quarry. PA-02-370\N & F Farms San Joaquin County Page 4 f- ,mm,inity Develooment