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WASTE DISCHARGE REQU61mr-MENTS -2- CITY OF STOCKTON AUSTIN ROAD LANDFILL CLASS III LANDFILLS SAN JOAQUIN COUNTY DESCRIPTION OF THE SITE 6. Land within 1,000 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 east end of the site. 7. The soils immediately underlying the landfill are valley fill deposits consisting of Cretaceous to Quaternary sediment-t. The first 20 to 40 feet are silty clay ( CL) and sandy or clayey silt (ML) . Below this is an interval of sands ( SM, SC , and SW) down to approximately 55 or 60 feet. Below this are more of the silts and clays down to at least 80 feet. 8. The first water-bearing formation is approximately 70 feet below the base of the WMUs. The hydraulic gradient is generally to the north/northeast. 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 facility is 6.17 inches. 12. A 45-acre portion of the facility south of the North Fork of South Little Johns Creek is within the 100-year floodplain. However, a berm will be constructed around the area to a height at least three feet above the 100-year flood level and will prevent inundation or washout of waste management units due to floods with a 100-year return period. 13. Surface drainage is to the North Fork of South Little Johns Creek. 14. The beneficial uses of these surface waters are domestic and agricultural supply, and ground water recharge. The beneficial uses of the North Fork of South Little Johns Creek are propagation and sustenance of fish and aquatic life; recreation; and esthetic enjoyment. OPERATION OF FACILITIES 15. The Discharger ' s current operations plans indicate the existing Class III landfill facility will reach capacity, at the earliest, by the year 1995. The total capacity of the disposal site is 4,500,000 cubic yards. 16. Current plans include closure of the existing waste management unit (LF-1) , or expansion of the facility in 1995. Expansion would be accomplished by the addition of a new Class III landfill unit (LF-2) in the 45 acre area south of the North Fork of South Little Johns Creek, which is hydro- geologically similar to the area of the existing landfill .