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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0148 - 14- MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY WASTEWATER TREATMENT AND LAND DISPOSAL FACILITY SAN JOAQUIN COUNTY 66. The Agricultural Guidelines present the maximum EC that various crops will tolerate before experiencing percent crop reductions (i.e., 0, 10, 25, and 50%). Data below summarizes irrigation water EC data(in µmhos/cm) for crops cultivated in the vicinity of the facility at various EC: Croo 0% Reduction 10%Reduction Com(Sweet) 1,100 1,700 Peaches 1,100 1,400 Alfalfa 1,300 2,200 Hay(Barley) 4,000 4,900 67. The Agricultural Guidelines indicate that boron sensitive crops such as stone fruit and grapes may show injury when irrigated with boron ranging from 0.5 to 1.0 mg/L and show reduced yield and vigor when irrigated with boron ranging from 1.0 to 2.0 mgt. 68. A long-term problem facing the Sacramento-San Joaquin Delta is increasing salinity in waterways and in groundwater, a process accelerated by man's activities and particularly affected by intensive irrigated agriculture. Basin Plan policies and programs focus on controlling the rate of increase of salt in the Basin from all controllable sources, and particularly point sources of waste. The Board is presently engaged in developing a Total Maximum Daily Load for the San Joaquin River. Proactive management of waste streams by dischargers to control addition of salt through use is a reasonable expectation. LAND TREATMENT UNIT (LTU) —LAWS AND REGULATIONS 69. Successful treatment and control in the application of waste constituents to land is an inexact science highly dependent upon the constituent, soils, climate, other practices that affect the property, and sound waste management and control. The process depends upon attenuation (decomposition, immobilization, and transformation) in the soil profile and consumption from the root zone by crops to remove waste constituents. Excessive application rates for waste constituents can result in vector conditions and anaerobic waste or soil conditions that can create nuisance odor conditions. Excessive application rates can also overload the shallow soil profile and root zone to impair crops, crop waste constituent consumption, and the waste attenuation process itself, and lead to leaching of waste constituents out of the treatment zone. Excessive application can also result in dissolution of soil minerals such as calcium and magnesium. Excessive hydraulic applications, even if from use of supplemental fresh water, can flush waste constituents, decomposition by-products, and dissolved minerals out of the treatment zone. Absent sufficient sustained reliable attenuation of residual waste constituents in the remaining soil profile, the constituents will eventually discharge into groundwater. Temporary storage of residual waste constituents within the soil column can misrepresent the effectiveness of the process. 70. Section 13173(b) of the CWC, defines designated waste as: "Nonhazardous waste that consists of, or contains,pollutants that, under ambient environmental conditions at a waste management unit, could be released in concentrations exceeding applicable water quality objectives or that could reasonably be expected to affect beneficial uses..."