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-3- WASTE DISCHARGE REQUIRR ENiTS - FOR CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY osits 14. The soils immediately underlying the landfill� valley0 tto 40 eetpare silty lay (CL) and sandy isting of Cretaceous to Quaternary sediments. Th or clayey silts a 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 VictormFormation and recent alluvium and flows northeasterly toward the Stockton pumping dept'ession 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 inches7Of d 986 Precipitation per year as measured at Austin Road Landfill between the years 19 The i00- 24-hour precipitation event for the site is 3.65 inches. 19. T year 20. Surface drainage is to the North Fork of South Littlejohn Creek. The Discharger proposes to reroutesurfkce,drainage to the„sedimentation pond at the west end of the site, as shown on Attachment B. i.c. ' .3. 21. The beneficial uses of surface waters are domestic, agricultural supply, and ground water recharge. The'benef cial uses •o the. -North fGrk of South Littlejohn Creek are propagation and sustenance of fish and aquatic life, recreation, and'esthetic enjoyment. , OPjERA,T1QNF.FACILTTIES 22. The Discharger's current plans indicate that the existing Class III landfill facility The total proposed expand sions will reach capacity, at the earliest, by the year 20 53. capacity of the disposal site is 18.1 million cubic yards. basis, a off`) 23. The City has accepted, on a one time b approximately 20,000 cubic yards of digested ewater treatment plant. The sludge isut wlnot cil be ntly sewage sludge from the City's wast being accepted at the landfill. The sludge has been stockpiled on LF -1, b removed and disposed off-site.