SITE INFORMATION AND CORRESPONDENCE

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Lodi Vintners - 2 - 23 August 2013 San Joaquin County violation of Discharge Specification B.6. of Order 93-112, which states, "Ponds shall be managed to prevent breeding of mosquitoes. In particular, a. An erosion control program should assure that small coves and irregularities are not created around the perimeter of the water surface. b. Weeds shall be minimized through control of water depth, harvesting, or herbicides...." Therefore the vegetation must be removed. • Flow between Ponds 3 and 4 is regulated by an overflow pipe set approximately two feet below the berm surface. • A four inch corrugated drain pipe was observed in the east bank of Pond 4 (Figures 7 & 8). No water was discharging from the pipe at the time of staff's inspection. The pipe appears to come from the slope above the ponds and based on the scour/erosion around the pipe outlet, a significant amount of water may discharge from the pipe into the pond. While the supply source of water to the pipe was not identified during the inspection, no organic material or odors were observed around the pipe outlet. Facility staff said they would investigate the origin of the pipe. The discharge of water to the wastewater ponds other than winery wastewater or storm water is not allowed by WDRs 93-112 and compromises the wastewater disposal system capacity. Therefore the discharge must cease immediately. • The center section of the south berm of Pond 4 has eroded away and wastewater is flowing into an unpermitted fifth pond (Figure 6). Discharge Prohibition A. 2. Of Order 93-112 states, "Bypass or overflow of untreated or partially treated waste is prohibited." Additionally, because of the erosion/overflow point, the pond does not meet the two foot freeboard requirement or WDRs Order 93-112. Discharge Specification B.8 of Order 93-112, which states, "Ponds shall have sufficient capacity to accommodate allowable wastewater flow, design seasonal precipitation, and ancillary inflow and infiltration during the non-irrigation season. Freeboard shall never be less than two feet, measured vertically." Therefore, Lodi Vintners is in violation of Discharge Prohibition A.2 and Discharge Specification 6.8. of Order 93-112. The southern berm of Pond 4 must be repaired to cease the overflow of wastewater and to restore pond storage capacity. Conclusions: Odors associated with wastewater were minimal in the vicinity of the wastewater ponds. However, insufficient maintenance has caused multiple violations of WDRs Order 93-112 and repair of the wastewater pond system is necessary to bring the facility into compliance with WDRs Order 93-112. Staff is concerned about the volume of wastewater in the wastewater ponds prior to the wet season. Generally, it has been staff's experience that because the primary wastewater generation season is typically August through September, by June and July one or more disposal ponds should be dry and undergoing seasonal maintenance (weed control, sludge cleanout and/or ripping).