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WASTE DISCHARGE REQUIREMENTS -3- FOR CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY 14. 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 (NIL). 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. 15. The first water-bearing formation is approximately 70 feet below the base of the landfill. The hydraulic gradient is generally to the north/northeast. 16. 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 8 to 130 feet per year in 1995. 17. The beneficial uses of ground water are domestic, municipal, and agricultural. 18. 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. 19. The 100-year, 24-hour precipitation event for the site is 3.65 inches. 20. Surface drainage is to the North Fork of South Littlejohn Creek. The Discharger proposes to reroute surface drainage to the sedimentation pond at the west end of the site, as shown on Attachment B. 21. The beneficial uses of surface wateri are domestic, agricultural supply, and ground water recharge. The beneficial uses of the,North Fork of South Littlejohn Creek are propagation and sustenance of fish and aquatic life,recreation, and'esthetic enjoyment. _r - .i;p,,. s QPRATIt1g QF-FACILITIES 22. The Discharger's current plans indiGate,that the existing Class III landfill facility and proposed expansion will reach capacity, at the earliest,by the year 2053. The total capacity of the disposal site is 18.1 million cubic yards. 23. The City has accepted, on a one time basis, approximately 20,000 cubic yards of digested o5 � sewage sludge from the City's wastewater treatment plant. The sludge is not currently being accepted at the landfill. The sludge has been stockpiled on LF-1, but will be removed and disposed off-site.