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1 Biological Resources, MONS&.ASSOCIATt ES Impacts and Mitigations Tracy Facility Expansion Site 13 (1971), EP-75-2(1975), EP-80-3 (1979). The proposed expansion site was permitted under EP-80-3 (phases 3 and 4)to remove 30,000,000 tons of sand and gravel over a five-year period. An environmental impact report,ER-75-2 was prepared for Permit No. EP-75-2. The proposed expansion site was deleted from the QX-8971 application(which was a renewal of EP-80-3) because of potential-,impacts to kit fox. QX-89 was subsequently approved, effective April 30, 1992,without phases 3 and 4 (the proposed expansion site). Both the east half and the west half of the 267-acre parcel he within a Mineral Resource Zone (MRZ-2) designated by the State Department of Mines and Geology as containing regionally significant deposits of high quality sand and gravel (Special Report 160, Stockton-Lodi Production-Consumption Region). The east half has now been depleted, except for the currently inaccessible portion that lies beneath the plant site of the Tracy Facility. The west half is the location of the proposed excavation expansion discussed herein. 3.2 History of the Project Site T_Jw jert Sites c�ons3st:S of approximately 137 aeres of previously disturbed habitat. Plast project disturbances on the ro'ect site have included: 1. Coal was discovered in Coral Hollow Canyon in 1857 and a haul road was constructed across the project site to allow coal wagons to haul coal to the San Joaquin River,three miles east of Tracy. 2. In 1870,the Western Pacific Railroad ran a rail spur four miles into Corral Hollow Canyon and used a steam shovel to open a gravel pit for ballast rock. 3. In 1895, a strip of land 100 feet wide within the boundaries of the project site was conveyed !` to the Alameda and San Joaquin Railroad Company,then a subsidiary of the Western Pacific Railroad and now the Union Pacific Railroad. This railroad right-of-way runs northeast to southwest through the project site as shown on the site pian(Figure 1). This easement was originally used to construct a railroad spur to connect to the mouth of the Corral Hollow Canyon. 4. The middle portion of the project site,,approximately one third of the property,was mined ! prior to Granite's acquisition of the site during historic mining. All topsoils and subsoils were removed from this portion of the project site. 5. Installation of an underground Unocal pipeline and creation and maintenance of facility access roads. 6. Corral Hollow Creek drainage,which flows west to east across the project site,was re- aligned and reconstructed adjacent to the California Aqueduct at the time of California Aqueduct construction in the 1960's. 7. The production of gravel shifted to the mouth of Corral Hollow about 1 mile west of the .project site in 1906 when Ford and Plummer opened the River Rock Plant. This plant was II 2 i