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ORDER NO.R5-2002-0148 • � - 15 - INFORMATION SHEET MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY WASTEWATER TREATMENT AND LAND DISPOSAL FACILITY SAN JOAQUIN COUNTY Discharge Prohibition A.4 This prohibition restricts discharge of percolate from the Land Treatment Unit(LTU) of waste classified as hazardous or designated. This restriction is necessary to protect groundwater quality. The Discharger has not shown that it meets the provisions of State Board Resolution No. 68-16 (as described in Findings No. 76-79). Instead, while the proposed discharge is nonhazardous, it does exhibit characteristics of "designated waste," as the concentrations of some waste constituents have the potential for causing exceedances of water quality objectives and/or adversely affecting beneficial uses of the groundwater. Therefore, it is appropriate to regulate the quality of the percolate released from the land treatment units (i.e., cropland). Discharge Prohibition A.7 This prohibition requires each land application area to be equipped with a tailwater/runoff control system to prevent discharge of wastewater to the natural surface water drainage. This prohibition is necessary to protect surface water quality. The Discharger historically has not been able to prevent wastewater from discharging off the facility property but has stated that the construction of the 84- million gallon storage pond will allow control of the discharge to only uncontaminated stormwater. The Discharger has provided a Draft Stormwater Pollution Prevention Plan to the Regional Board; but staff has determined the report is incomplete and requested additional information. Discharge Prohibition A.9 The Discharger has proposed allowing diversion of stormwater around the 84-million gallon storage pond, however it has failed to present specific criteria to evaluate the acceptability of such a discharge. In addition, the Discharger has not presented an evaluation of the wastewater application areas and the potential for mixing stormwater with wastewater in runoff proposed for diversion. It is noted that the Discharger has requested permission to apply wastewater during rain events. Staff is concerned that due to low permeability rates, applied wastewater will run off the land application areas and could be diverted around the 84-million gallon storage pond. Until the watershed evaluation is completed, specific criteria on diversion is presented to the Regional Board, and the Executive Officer approves the criteria, all diversions are prohibited. Discharge Prohibition A.11 The Discharger has requested that the prohibition on allowing animals to graze in the land application areas be removed. The Discharger proposes to graze goats or sheep for crop harvesting on an intermittent, short-term basis,particularly for the more steeply sloped 95-acre portion of the land application areas where the area is more difficult to harvest using conventional methods. During the short periods the animals are present for harvesting purposes, process wastewater would not be applied to those areas. Animal harvest of the crops would be limited to 10-acre plots at a given time,therefore, less than five percent of the spray fields will be given over to grazing. This Order allows limited grazing on the 95-acre land application area but staff remain concerned about the impact of animals on the application areas. The prohibition has been changed to allow grazing on the 95-acre land application area and only 10-acres at a time. Staff's concerns about the use of animals on the steep slopes are in part based on information the Discharger has previously submitted and information gathered during site inspections. The Discharger has indicated during staff inspections that grazing cows