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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -13- DELICATO VINEYARDS, INC. DELICATO FAMILY VINEYARDS SAN JOAQUIN COUNTY 51. According to a 2008 Flood Insurance Rate Map for the area, the facility is located in Flood Zone X, which is outside the currently-defined Federal Emergency Management Agency (FEMA) 100-year flood zone. 52. Annual precipitation in the vicinity since 1949 averages approximately 13.8 inches per year. The 100-year, 365-day precipitation event is approximately 29.1 inches, and the average reference evapotranspiration (ETo) rate is approximately 52.1 inches per year. 53. Domestic wastewater generated at the winery is currently discharged into six separate septic systems that are permitted by the San Joaquin County Environmental Health Department. Domestic wastewater is generated at the tasting room, washrooms and toilets, and an employee lunchroom (no cafeteria). As part of the planned facility expansion, two of the existing septic systems will be abandoned and replaced. The new septic systems will be permitted by the San Joaquin County Environmental Health Department. Groundwater Considerations 54. The facility site is underlain by alluvial fan deposits consisting of poorly sorted clay, silt, sand, and gravel. According to United States Department of Agriculture (USDA) Natural Resource Conservation Service (NRCS) data, near-surface soils at the facility are classified as Delhi, Timor, and Veritas series soils. These soils are characterized as having moderate to fast near-surface saturated hydraulic conductivity values. Timor and Veritas soils are located at the southwestern limits of the facility property and are characterized as having a duripan at depths of 40 to 60 inches, which may impede vertical percolation rates. Sandy loams in the LAAs are characterized as being moderately to highly drained soils with a soil water capacity of 4.7 to 7.6 inches in the top 60 inches. 55. Six groundwater monitoring wells (MW-1 through MW-6) have been installed at the facility and are monitored in accordance with the Revised MRP. The monitoring well locations are illustrated on Attachment B and summarized below. Year Screen Interval Well ID Installed (feet b s) Description of Well Location MW-1 2001 30-45 Upgradient of current discharge areas and upgradient of planned LAA Nos. 1, 2, 3, and 4 MW-2/ 2001 / Downgradient of existing unlined wastewater 25 -40 ponds and compost area and within planned MW-2r 2004 LAA No. 1 MW-3 2001 25 -40 Downgradient of current LAAs and planned LAA No. 3 MW-4 2008 35 - 50 Upgradient of existing LAAs and planned LAA No. 5