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7-1 WASTE DISCHARGE REQUIREMENTS FOR CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY 2 5. Land within 1000 feet of the facility is used for agricultural and landfilling activities to the south; the Northern California Youth Center to the north; and the Pacific Energy methane gas recovery system on the west end of the site. 6. The soils immediately underlying the landfill are valley fill deposits consisting of Cretaceous to Quaternary sediments. The first 20 to 40 feet are silty clay (CL) and sandy or clayey silts (ML). Below this is an interval of sands (SM, SC, and SW) down to 55 or 60 feet. Below this are more of the silts and clays down to at least 80 feet. 7. The first water -bearing formation is approximately 70 feet below the base of the landfill. The hydraulic gradient is generally to the north/ northeast. 8. The ground water contaminant plume beneath the site occurs in the Victor Formation and recent alluvium and flows northeasterly toward the Stockton pumping depression. The ground water flow velocity ranged from 6 to 1200 feet per year in 1993. 9. The beneficial uses of ground water are domestic, municipal, and agricultural. 10. The facility receives an average of 14.22 inches of precipitation per year as measured at Austin Road Landfill between the years 1976 and 1986. 11. The 100 -year, 24-hour precipitation event for the site is 6.17 inches. 12. Surface drainage is to the North Fork of South Littlejohns Creek. The Discharger proposes to reroute surface drainage to the sedimentation pond at the west end of the site, as shown on Attachment "B" which is attached hereto and made a part hereof. 13. The beneficial uses of surface waters are domestic, agricultural supply, and ground water recharge. The beneficial uses of the North Fork of South Littlejohns Creek are propagation and sustenance of fish and aquatic life, recreation, and esthetic enjoyment. OPERATION OF FACILITIES 14. The Discharger's current plans indicate that the existing Class III landfill facility will reach capacity, at the earliest, by the year 1999. The total capacity of the disposal site is 4,500,000 cubic yards.