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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -14- DELICATO VINEYARDS, INC. DELICATO FAMILY VINEYARDS SAN JOAQUIN COUNTY Year Screen Interval Well ID Installed (feet bgs) Description of Well Location MW-5 2008 35 - 50 Upgradient existing LAAs and downgradient of planned LAA No. 5 MW-6 2008 35 -50 Downgradient of planned LAA No. 6 ' Monitoring well MW-2 was replaced in 2004 as a result of surface damage from on-site operations. 56. Monitoring well installation logs indicate that shallow soils at the facility consist of inter-bedded silt and fine to medium-grained sand intervals to depths of approximately 50 feet below ground surface (bgs). The six monitoring wells are screened across intervals of fine to medium grained sands inter-bedded with fine- grained sediments. 57. Quarterly groundwater monitoring conducted since 2001 shows that shallow groundwater occurs at depths ranging from approximately 30 to 40 feet bgs. The direction of groundwater flow is generally to the north-northeast, with a relatively low degree of horizontal gradient. Quarterly monitoring data since 2001 show seasonal fluctuations in groundwater levels, and also a general increase in groundwater elevations beginning in 2010. The local topography and low horizontal gradient may indicate a low net horizontal movement of shallow groundwater. 58. The monitoring well network is sampled quarterly and groundwater samples are analyzed for electrical conductivity (EC), TDS, nitrate as nitrogen, TKN, calcium, potassium, magnesium, sodium, chloride, sulfate, total alkalinity, hardness, and trihalomethanes. Groundwater monitoring also includes calcium, magnesium, sodium, chloride, sulfate, total alkalinity, and hardness on an annual basis. 59. Average groundwater monitoring results of selected wastewater-related constituents from 2001 through the third quarter of 2012 are presented below. Mean Analytical Result(mg/L, except as noted) ' Well ID TDS TKN NO3-N SO4 Ca Na CI Mg MW-1 1,034 1.07 25 47 100 179 24 58 MW-2/2r z 1 1,664 1.38 0.2 139 138 341 92 101 MW-3 1,663 0.86 1 163 143 366 123 101 MW-4 3 689 1.19 10 64 91 86 23 44 MW-5 3 777 1.29 32 97 92 50 23 38 MW-6 3 169 1.27 7 8 21 9 2 10 Potential Water 4504 4 5 6 4 106 to --- Quality to 1,500' --- 10 250 --- 69 5007 Objective 1 Averages include non-detect results factored in at the laboratory reporting limit.