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_ The Plan will be amended whenever there is a change in construction, operation, or maintenance which may result in or affect storm water discharge, or if the Plan or site is in violation. Amendments to the Plan will be based on the findings of regularly scheduled inspections of the facility, as well as changes in operations and permitting of the facility. 2.0 FACIIdTY DESCRIPTION The KRC Aggregate facility is located in eastern San Joaquin County, east of the City of Lodi. The property encompasses approximately 1100 acres roughly coinciding with the northeast quarter of Section 29, the west half of Section 29, and the east half of Section 30, Township 4 North, Range 9 East, Mount Diablo Base and Meridian. Approximately 400 acres lie within the planned mine area. The area terrain generally consists of gently sloping hills and ridges with a predominant drainage pattern towards the northwest. Site elevations range from approximately 200 feet to 300 feet above mean sea level. Three significant ephemeral creeks traverse the property, each of which is a tributary to Bear Creek. Figure 1, a section of the U.S. Geologic Survey, 7.5 minute series Topographic Map, Clements Quadrangle, shows site topography and drainage patterns. The site is comprised of five areas which are subdivided based on general operations. The five areas include the Quarry, Plant, Offices & Vehicle Maintenance Shop, Boneyard, and Pristine and Reclaimed areas. Figure 2, Site Map, shows the subdivisions of the site. 2.1 Quarry The Quarry, shown in Figure 3, consists of the active quarry and the balance of the 100 acre parcel currently permitted for quarry excavation by San Joaquin County. As of June 1, 1992, roughly one quarter (the southwest quarter) of the permitted area had been mined out. This area is currently being reclaimed. The final elevation of the mined area will be between 222 feet and 240 feet above mean sea level. The current mine plan suggests that mining will occur in six phases (from south to north) in the permitted area. In practice, mining is being carried out by selectively excavating areas rich in aggregate from phases two through four. Phase 1 is used for material handling and contains the current storm water holding pond. The quarry highwall is being advanced northerly and easterly using standard earthmoving equipment. Raw material is dumped in a receiving area and then transported to the plant via conveyor. The conveyor system will be extended to facilitate a short haul distance as the active portion of the quarry moves north. Storm Water Manepm<m Plan-6RC Agpepte Inc 655?,*a Nn 59210/1 2 Revised Janwry 1991