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oP4HIN, c SAN JOAQUIN COUNTY > i'+o Q i�COMMUNITY DEVELOPMENT DEPARTMENT _ -• 1810 E.HAZELTON AVE.,STOCKTON;CA 95205.8232 • � ci F'o'�'p PHONE:2091488-3121 FAX 2091488-3183 - NOTICE OF PREPARATION Environmental Impact Report No. PA-0400174 On the basis of the Initial Study prepared for the project description below, the Environmental Review Officer has determined that the project may have a significant impact on the environment and thereby gives notice that an Environmental Impact Report is to be prepared in accordance with the provisions of the California Environmental Quality Act (CEQA) as amended. Application: The applicant, DeSilva Gates Construction, has submitted a Quarry Excavation application (PA-0300550-a discretionary project subject to approval by the Planning Commission)to permit the extraction of 20 million cubic yards of aggregate (30 million tons) over a forty (40) year period. Project: Quarry Operation The project is a phased Quarry Excavation application to extract 20 million cubic yards of aggregate (30 million tons) over a forty(40) year period. The excavation will occur on approximately 155 acres (five parcels) of a 217.5 acre project site. The applicant also proposes to construct a processing plant with ancillary buildings on approximately 10 acres of the project site. Reclamation will occur on all 165 acres of disturbed land. It is anticipated that an average of 750,000 tons of aggregate will be produced annually. The maximum amount of aggregate produced annually will be 1.5 million tons. The average groundwater depth is 75 feet above mean sea level (AMSC). The maximum depth of the quarry excavation will be 175 feet (15 feet AMSC). Reclamation Plan The project will be excavated and reclaimed in four (4) phases using two pits; the South Pit (approximately 40 acres) and the North Pit (approximately 115 acres), respectively. Each pit will be excavated and reclaimed in stages as follows (also see attached Figure 14 from reclamation plan): Phase 1A: Excavate South Pit to groundwater. Excavate Stage 1 to design depth and backfill fines in Stage 1 while excavating Stage 2 of South Pit. Phase 18: Excavate Stage 1 of North Pit to 20 foot depth. Store water from South Pit in Stage 1 of North Pit. Mine South Pit to design depth. i