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