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Attachment to Initial Study for QX-01-2 Project Description: The project is a Quarry Excavation application for a sand and gravel mining operation. The mining operation will take place on approximately 688 acres and is expected to generate more than 100 million tons of sand and gravel over a 60-year period. The mining will be divided into nine phases; each phase will last approximately two to 12 years. Approximately 590 acres, or 85 percent of the proposed quarry, is located in San Joaquin County; the remaining portion of the quarry is located in Stanislaus County. Current Site Conditions: The site is located south of Blewett Road, east of Koster Road, north of Hospital Creek and west of Welty Road, southeast of Tracy. The site is bounded on the west by the Delta Mendota Canal. The western property line is approximately 300 feet from the centerline of the Delta Mendota Canal. The proposed site and the surrounding area are relatively level. The majority of the site is in orchard. A residence and a bam are also located on the project site. Surrounding Land Uses: The project site is located in an agricultural area used for orchards and row crops. There are also quarries in the surrounding area, particularly to the west of the project site where a quarry is located on the west side of Koster Road. DISCUSSION OF IMPACTS lb., c., d. Water The proposed quarry will relocate an existing creek(Hospital Creek)in the southwest corner of the project site. The creek will be relocated further south along the southern boundary of the site to increase the mining footprint. In a telephone conversation with Dan Gifford of The Department of Fish and Game on January 29, 2002, Mr. Gifford stated that the relocation of Hospital Creek would require a 1600 permit(Stream Alteration Agreement) from the Department of Fish and Game. The relocation of the stream may have a potentially significant impact on storm drainage. The applicant also proposes to use groundwater and recycled water for a water supply. Once the silt ponds are established recycled waters will be collected from the silt ponds _ and used for washing the sand and gravel. The anticipated water usage at that point would be approximately 25 percent well water. Before the silt ponds are operational RMC will use only well water. The expected life span of the quarry will be 60-years, so the use of the well is expected to be continuous for 60 years. In a letter dated January 23, 2002, the San Joaquin County Environmental Health Division required that the potential