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• 557!�W Woodbridge Road, Lodi APN 011-170-52, SR0080658, PA-1800279 Page 2 • The nitrate loading study considered only the nitrate contribution from the domestic wastewater to be generated from the Phase I development. The cumulative potential for nitrate loading for the remaining phases must be addressed in a supplemental SSNL study to be submitted before the issuance of building permits at the time of development for Phase II. This supplement must address the cumulative potential for nitrate loading from all OWTS sources on the property, including the proposed Phase II maximum usage, two existing residences, the existing bathroom building, and the Phase I building usage. • Any OWTS installed on the premises are approved for domestic wastewater discharges only. Winery production, laboratory, and cleaning process wastewater discharges to a OWTS are prohibited. • The location of the new OWTS to be installed for the winery production facility must meet all current setback requirements, including 150 feet from any water wells that may serve as a future small public water system source well. • Section 5.4 of the SSNL Study provides an estimated domestic wastewater flow rate of 2928 gallons per day for the proposed Phase I building. The discussion indicates that there is an EHD requirement to use 2000 gallons per day per acre. This statement is incorrect as there is no such requirement. The basis for estimating the average daily flows from a commercial establishment is found in Section 6.0 of the San Joaquin County OWTS Standards and is based on number of employees and visitors. • The OWTS design calculations, based on the provisions of the San Joaquin County OWTS Standards using the maximum number of employees and visitors must be submitted to the EHD prior to OWTS installation permit issuance, along with an updated site map showing the location of the OWTS and 100% replacement area. This area must be reserved only for OWTS usage and must be secured from being driven over, parked on, or used for any other purpose. The new OWTS, based on the design indicated above, must be installed under permit and inspection from the EHD prior to final occupancy. • The results of the water well sampling conducted on May 20, 2019 showed Nitrate as Nitrogen to be 9.4 mg/I, which is 0.6 mg/I less than the maximum contaminant level (MCL) of 10 mg/I for drinking water. A potable water supply to this facility must be maintained and it is recommended that the water supply well be tested on a regular basis to ensure the water remains below the MCL for Nitrate as Nitrogen. A new source well that can meet the requirements of the California Safe Drinking Water Act may be required at the time the facility becomes a Small Public Water System (see comment below). • Before such time that the employees and visitors at this facility reach 25 or more persons for 60 days of the year or more, a permit to operate a small public water system is required. As this process may be lengthy, it is recommended that it be initiated at least six months prior to the time an application to operate a public water system is required. Please reference Condition of Approval 2.e. in the CDD approval letter for more information.