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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 95- WASTE DISCHARGE REQUIREMENTS FOR TRI VALLEY GROWERS, PLANT NO. 4 WASTEWATER DISPOSAL SITE STOCKTON, SAN JOAQUIN COUNTY The Cahfor:ua Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. Tri Valley Growers Plant No. 4, (hereafter Discharger) submitted a Report of Waste Discharge, dated 6 April 1993, for their wastewater treatment and disposal facility. The property (Assessor's Parcel Nos. 092-040-03, 04, 05, 06, 07, 11, 12, 13, and 16) is owned by Tri Valley Growers. 2. Waste Discharge Requirements Order No. 88-147, adopted by the Board on 12 August 1988, prescribes requirements for a discharge from processing facility to land. 3. Order No. 88-147 is neither adequate nor consistent with current plans and policies of the Board. 4. Tri Valley Growers Plant No. 4 processes tomatoes and cherries. Water is supplied by two on- site wells. Fresh tomatoes are processed during the months of July, August, and September. The processing consists of washing, disinfecting, peeling, and canning. The remainder of the year, the plant processes cherries and reprocesses tomatoes into products. The cherry processing consists of stemming, sizing, pitting, halving and finally sending to vats where they are boiled and rinsed to remove the brine. The cherries are next dyed to their final color. The coloring materials are reused as much as possible prior to discharging. Other processes that generate wastewater include tank rinsing, equipment cleaning, tomato container washing, and general sanitation at the plant. 5. Prior to discharge to the irrigation fields, the wastewater is combined in a concrete sump. The wastewater is then run across a parabolic screen to remove the bulk of the large solids which are collected and used for land application or animal feed. The wastewater is next mixed with the effluent of the catalyst converter/biotowers system for odor control. The wastewater is then discharged to a delivery ditch before pumping to the irrigation fields. 6. The facility flood irrigates up to 4.0 million gallons per day of wastewater via pipes across Bear Creek to a 405 acre field during the peak months (July-September). The discharge is intermittent the remainder of the year. The facility is limited to 81 acres (north of Bear Creek) during the wet months by a restriction imposed by the U.S. Corps of Engineers for flood control purposes. The average percolation rate for the 486 acre field was estimated at 0.30 in/hr. The facility has five ground water monitoring wells. Ground water occurs 70 feet below the ground surface.