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INITIAL STUDY CONTINUED PA-03-550 (QX) Project Description: 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 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 1B: 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. Phase 2A: Mine Stage 1 of North Pit to groundwater. Backfill South Pit with overburden and fines to 15 feet above groundwater. Phase 2B: Mine Stage 1 of North Pit to design depth. Store groundwater in South Pit. Phase 3A: Mine Stage 2 of North Pit to design depth. Backfill Stage 1 of North Pit with overburden and fines to 15 feet above groundwater and replace topsoil: Store groundwater in South Pit. Phase 3B: Mine Stage 3 of North Pit to design depth. Backfill Stage 2 of North Pit with overburden and fines to 15 feet above groundwater. Replace topsoil. Store groundwater in South Pit. Phase 4: Stage 3 of North Pit remains as pond for agricultural use (elevation 75 feet). Stage 1 and Stage 2 of North Pit backfilled to 15 feet above groundwater (elevation 90 feet-Final Reclamation). South Pit backfilled to 15 feet above groundwater (elevation 90 feet). Replace topsoil. The project site is located on the west side of Koster Road (east of the Delta Mendota Canal) between Vernalis Road (State Route 132) and Blewitt Road, southeast of Tracy.