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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -5- DELICATO VINEYARDS, INC. DELICATO FAMILY VINEYARDS SAN JOAQUIN COUNTY GROUNDWATER MONITORING Prior to construction and/or sampling of any groundwater monitoring wells, the Discharger shall submit plans and specifications for approval. Once installed, all new wells shall be added to the compliance monitoring network. The following table lists all existing monitoring wells and designates the purpose of each well: MW-1' MW-2r 3 MW-3 3 MW-4 ' MW-5 2 MW-6 4 Background well not used for compliance monitoring. 2 Current background well that will be converted to use for compliance monitoring once land application areas are expanded to 130 acres 3 Current and future compliance well. 4 Current background well not suitable for use as a future compliance well because of influence from SSJID irrigation canal. Prior to sampling, depth to groundwater measurements shall be measured in each monitoring well to the nearest 0.01 feet. Groundwater elevations shall then be calculated to determine groundwater gradient and flow direction. Low or no-purge sampling methods are acceptable, if described in an approved Sampling and Analysis Plan. Groundwater monitoring for all monitoring wells shall include, at a minimum, the following: Type of Sampling Reporting Constituent Units Sample Frequency Frequency Depth to Groundwater ' ±0.01 feet Measurement Quarterly Quarterly Groundwater Elevation ±0.01 feet Calculated Quarterly Quarterly Gradient feet/feet Calculated Quarterly Quarterly Gradient Direction Degrees Calculated Quarterly Quarterly pH pH units Grab Quarterly Quarterly Chloride mg/L Grab Quarterly Quarterly Sodium 2 mg/L Grab Quarterly Quarterly Sulfate mg/L Grab Quarterly Quarterly Nitrate as Nitrogen mg/L Grab Quarterly Quarterly Total Dissolved Solids mg/L Grab Quarterly Quarterly Metals/Inorganics 2,3 mg/L Grab Annually Annually Groundwater elevation shall be determined based on depth-to-water measurements from a surveyed measuring point elevation on the well. 3 Samples shall be field filtered with a 0.45-micron filter prior to preservation or digestion, as appropriate. 3 Metals/Inorganics include the following: arsenic, boron, calcium, iron, magnesium, manganese, potassium, total alkalinity(including alkalinity series), and hardness.