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. P . e WASTE DISCHARGE REQUIREMENTS 2 FOR CLOSURE AND POST-CLOSURE MAINTENANCE OF HARNEY LANE CLASS III LANDFILL SAN JOAQUIN COUNTY The landfill generally received residential and commercial refuse, construction debris, and agricultural waste. WASTES AND THEIR CLASSIFICATION 6. The discharger disposed of municipal solid waste in the Class III Landfill Unit, as shown on Attachment B. These wastes were classified as nonhazardous solid waste using the criteria set forth in Chapter 15. SITE DESCRIPTION 7. The landfill was originally constructed as a series of trenches which ran in an east west direction. 8. Land within 1000 feet of the facility is used for agriculture, with the exception of a migrant farm labor housing project at the northwest comer of the landfill site. 9. The soils immediately underlying the landfill consist of silts, clays, and sands, are highly impermeable; 101 to 10-1 cm/sec. These are unconsolidated soils approximately 80 feet thick and belong to the Victor and Laguna formations. 10. Ground water is encountered at approximately 110 feet below ground surface. The average ground water gradient is to the south-southwest at 0.25 percent. Ground water elevations fluctuate about four feet over a year, and the mean level appears to be dropping steadily over time. Volatile organic compounds (VOCs) have been detected at low concentrations in monitoring wells MW-2 and MW-4. After resampling for VOCs the Discharger determined that VOCs were not present and that positive detections were due to laboratory errors. MW-4 has significantly higher concentrations of chloride, TDS, and EC than background well MW- 1. The Discharger maintains that these elevated levels are due to percolation from the migrant labor camp sewage treatment ponds and not the landfill. 11. The beneficial uses of ground water are irrigation and residential water supply. There are approximately 33 wells on and in the immediate vicinity of the site. The depths of these wells range from 152 to 392 feet below ground surface. 12. Surface drainage is to South Paddy Creek, a tributary to Bear Creek and Disappointment Slough, which flows into the San Joaquin River.