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WASTE DISCHARGE REQUIREMENTS ORDER NO. R5-2010-0016 -3- <br />SAN JOAQUIN COUNTY DEPARTMENT OF PUBLIC WORKS <br />NORTH COUNTY LANDFILL <br />SAN JOAQUIN COUNTY <br /> <br /> <br />discharged to the landfill in 2008. About 5.3 million cubic yards (CY) of waste are <br />estimated to be in place at the landfill. <br />8. The JTD includes a proposal to accept “treated wood waste” (TWW), a hazardous <br />waste under California Health and Safety Code (CHSC), division 20, chapter 6.5, <br />article 5, Section 25150.7; and CCR, title 22, chapter 34, Section 67386.2 (see <br />Information Sheet, Attachment 1). Title 22 allows TWW to be disposed of in any <br />portion of an MSW landfill that is compositely lined, provided that the WDRs allow <br />such disposal and that the TWW is handled in accordance with specified <br />alternative standards consistent with the CHSC, Title 22 and the California Water <br />Code. These WDRs allow the landfill to accept TWW provided that the Discharger <br />complies with those standards. See Discharge Prohibition A.9 and Discharge <br />Specifications B.7 through B.10. <br />9. The landfill is a “new” waste management unit under Title 27, Section 20080(d), <br />since it did not operate on or before 27 November 1984. The landfill is a Class III <br />landfill unit under Title 27, article 3, subchapter 2, chapter 3. <br />SITE DESCRIPTION <br />10. The site is in the Central Valley alluvial plain near the edge of the Sierra Nevada <br />Foothills. The surrounding terrain is low rolling pastureland with an average grade <br />of about 1/2% toward the west. Surface elevations range from about 105 feet MSL <br />in the southwest corner of the site to about 125 feet MSL in the southeast corner of <br />the site. <br />11. Land uses within the landfill vicinity include agriculture, livestock grazing, dairies, <br />industrial, and low-density residential development. Other uses in the area include <br />water conveyance, roads, utility easements, and a migrant labor housing facility. <br />12. An August 2004 Department of Water Resources (DWR) well survey identified 37 <br />active municipal, domestic, industrial, or agricultural groundwater supply wells <br />within one mile of the site. The wells ranged from about 100 to 700 feet deep and <br />averaged about 225 feet deep. Three onsite supply wells were also identified, <br />including one domestic, one agricultural and one industrial well. No wells were <br />identified within 1000 feet of the landfill. <br />13. The site is not within a 100-year floodplain based on the Federal Emergency <br />Management Agency’s Flood Insurance Rate Map, Community Panel Number <br />060-299-0330A, effective May 15, 1980. <br />SURFACE AND STORM WATER <br />14. Surface drainage in the area is to South Paddy Creek (an intermittent stream that <br />crosses the site immediately north of the landfill); thence to Paddy Creek (about <br />2.8 miles west of the site); Bear Creek; and Disappointment Slough, which is <br />tributary to the San Joaquin River.