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WASTE DISCHARGE REQUIREMENTS 2 <br /> FOR THE CLOSURE AND POST CLOSURE <br /> OF HARNEY LANE CLASS III LANDFILL <br /> SAN JOAQUIN COUNTY <br /> 5. This is an existing landfill first operated by the City of Lodi in 1948. Before <br /> closure operations began, the landfill received approximately 125,000 tons of <br /> waste annually. The landfill has generally received residential and <br /> commercial refuse, construction debris, and agricultural waste. <br /> WASTES AND THEIR CLASSIFICATION <br /> 6. The Discharger has discharged municipal solid waste in the Class III Landfill <br /> Unit, as shown on Attachment B. These wastes are classified as non hazardous <br /> solid waste using the criteria set forth in Chapter 15. <br /> SITE DESCRIPTION <br /> 7. The landfill was originally constructed as a series of trenches which ran in an <br /> east west direction. <br /> 8. Land within 1000 feet of the facility is used for agriculture, with the exception <br /> of a migrant farm labor housing project at the northwest corner of the landfill <br /> site. <br /> 9. The soils immediately underlying the landfill consisting of silts, clays, and <br /> sands, are highly impermeable; 10-6 to 10-8 cm/sec. These are unconsolidated <br /> soils approximately 80 feet thick and belong to the Victor and Laguna <br /> formations. <br /> 10. The ground surface elevations at the site are from 75 to 95 feet above mean sea <br /> level, sloping generally to the west-southwest. From the surface to a depth of <br /> 40 feet, silty sand/sandy silt is the predominant soil type. From 40 to 65 feet, <br /> below the surface, fine to coarse grained sand is encountered with some traces <br /> of gravel toward the south side of the site. From 65 to 100 feet, below the <br /> surface, clay and clayey sand with some sandy or gravelly lenses are present. <br /> From 100 to 150 feet, below the surface, sand and gravelly sand is <br /> encountered. <br /> 11. Ground water is encountered at approximately 110 feet below ground <br /> surface. The average groundwater gradient is to the south-southwest at 0.25 <br /> percent. Groundwater elevations fluctuate about four feet over a year, and <br /> the mean level appears to be dropping steadily over time. Volatile or-anic <br /> compounds (VOCs) have been detected at low concentrations in monitoring <br /> wells MW2 and MW4. MW4 has significantly higher concentrations of <br /> chloride, TDS, and EC than background well MW 1. <br /> 12. The beneficial uses of ground water are irrigation and residential water <br /> supply. There are approximately 33 wells on and in the immediate vicinity of <br />