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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION CLEANUP AND ABATEMENT ORDER NO. R5-2004-0705 FOR DELICATO VINEYARDS WASTEWATER DISPOSAL SITE SAN JOAQUIN COUNTY This Order is issued to Delicato Vineyards (hereafter known as "Discharger") and is based on provisions of California Water Code Section 13304 which authorize the Regional Water Quality Control Board, Central Valley Region (hereafter known as Regional Board)to issue a Cleanup and Abatement (C&A) Order. The Executive Officer of the Regional Board finds, with respect to the Discharger's acts, or failure to act, the following: 1. Waste Discharge Requirements (WDRs) Order No. 96-077 was adopted by the Regional Board on 22 March 1996 for Delicato Vineyard's wastewaster disposal site in Manteca, San Joaquin County. The WDRs address the wastewater discharge associated with winery production activity. The Monitoring and Reporting Program (MRP), which is part of the WDRs, was revised in 2001 to include the requirement to conduct groundwater monitoring. 2. The Discharger owns and operates the facility and is responsible for complying with this enforcement action. Waste Generation and Discharge 3. The facility consists of approximately 100 acres of vineyards, administrative and wine production buildings, and two 10-acre wastewater application areas. Sanitary wastewater is discharged to several separate septic tank/leachfield systems. 4. Process wastewater consists primarily of wine processing wastewater and equipment washwater, mixed with grape skins, seeds, and stems. The strength of the wastewater may be highly variable depending on the season and operations being conducted at the winery. 5. On an annual basis, the facility generates approximately 100,000 gallons of process wastewater per average working day. The winery operates year-round, but the maximum wastewater discharge occurs during the crush system from September through November; during this period, flows can average 165,000 gallons per day. 6. Process wastewater is applied to two approximately 10-acre unlined checks, which are not cropped but contain naturally occurring grasses and weeds. The two application areas are referred to as the "southwest check" and the "northeast check". Wastewater is applied by flooding the areas and is treated passively by the land and/or is taken up by the vegetative growth within the checks. Soil and Groundwater Conditions 7. Site topography is flat and level. The site is underlain by alluvial fan deposits consisting of poorly sorted clay, silt, sand, and gravel.