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WASTE DISCHARGE REQUIREMENTS FOR -2- CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY 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 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 landfill . 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. Surface drainage is to the North Fork of South Little Johns Creek. The Discharger proposes to reroute surface drainage to the sedimentation pond at the west end of the site (Attachment "B"). 13. 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 14. 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. 15. 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 may be used in the foundation layer of the final cover. 16. Current plans are to close the existing landfill , or expand the facility in 1995. 17. The Discharger has implemented a periodic load checking program which consists of daily random checks of incoming loads. Signs, prenotification programs, and procedures for handling identified hazardous wastes have also been developed. 18. Inspections of the landfill over the past several years have noted that the surface of the landfill was not graded to drain. Rainfall has accumulated in depressions on the landfill surface where it percolated into wastes and became available to generate leachate. Proper grading is needed to prevent rainfall from percolating into wastes. A time schedule for landfill cover grading is included in Provision C.17.