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SAN JOAQUIN COUNTY COMMUNITY DEVELOPMENT DEPARTMENT 1810 E.\9i'iF Ciq�; ON AVE.. 952082 PHONE:2W/483121 FAX::9/468-313 April 8, 2004 MEMORANDUM TO: Development Committee FROM: Jennifer Senior PI nn SUBJECT: QUARRY APPLICATION NO. PA-03-550 OF THOMING AGGREGATES, INC. (C/O DESILVA GATES CONSTRUCTION) (APN: 255-080-08 - THROUGH 12)-(A0DRES&--35775 S KOSTER ROAD, TRACY) 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 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. Phase 2A: Mine Stage 1 of North Pit to groundwater. Backfill South Pit with overburden and fines to 15 feet above groundwater. Phase 28: Mine Stage 1 of North Pit to design depth. Store groundwater in South Pit. 1