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WASTE DISCHARGE REQUIREMENTS FOR -2- CITY OF STOCKTON AUSTIN ROAD LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY DESCRIPTION OF THE SITE 6. 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 east end of the site. 7. 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 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 (WMUs) 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 surface waters are domestic, 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 plans indicate that 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. The City has accepted, on a one time basis, approximately 20,000 cubic yards of digested sewage sludge from the City's wastewater treatment plant, and will accept approximately 5,000 cubic yards of this sludge on a yearly basis. The sludge is currently being stockpiled at the landfill . The sludge will either be used in the foundation layer of the final cover, or will be placed in a monof i l l separate from the municipal solid waste.