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LOGE 1726: Phillips/Michael David NLS Addendum Page 6 September 20, 2017 • The estimated flow values discussed here should not be used for the design and sizing of the septic system. The design and sizing of the septic system should utilize the San Joaquin County Environmental Health On-Site Wastewater_DisposalStandards which incorporate peak and surge flow factors. The estimates used in the On_-Site Wastewater Disposal Standards may be greater than those discussed here. According to Kevin Phillips, at full expansion the facility may employ 30 office workers five days per week, 12 to 18 restaurant workers seven days per week, 3 to 10 tasting room workers seven days per week, and 2 workers at the overflow tasting room three days per week. For the winery, 50 production workers would be anticipated five days per week year round. In the event of a second, future expansion, an additional 50 production workers would be anticipated five days per week year round (personal communication, September 7, 2017). Mr. Phillips estimates that up to 350 customers per day (Friday through Sunday) or 125 customers per day (Monday through Thursday) would be anticipated at the cafe, as well as 650 customers per day (Friday through Sunday) or 210 customers per day (Monday through Thursday) at the tasting room; both of these facilities operate seven days per week. An approximate 20% of the customers may utilize both the cafe and tasting room on the same visit. Up to 100 customers would be anticipated at the overflow tasting room three days per week. Special events are expected to take place 25 times per year; up to 18 workers and 300 customers would be anticipated for each special event. The nitrate as nitrogen (N) concentration of the employee, tasting room, and special event uses • is estimated to be 85-mg/L. Because the cafe usage includes a considerable contribution from dish washing, its nitrate as N concentration is estimated to be 35, the typical concentration of mixed-source, untreated domestic wastewater (Crites and Tchobanoglous, 1998). Because the parcel on which it is located is not part of the current project, the existing residence is excluded from the present nitrate loading calculation. No contributions from crop irrigation or soil amendments are considered for the Hantzsche/Finnemore method. It is reasonably assumed that the irrigation and soil amendments would be applied at close to agronomic rates for a net balance of plant irrigation and nutrients. No contribution from winery process water is considered; Mr. Phillips has indicated that this water will be trucked off-site for disposal or disposed into the new City sewer line that may be constructed in the future. The maximum average daily flow for the Site was estimated to be 4,779 gallons per day (gpd). Through the use of a weighted average, the average concentration of all the different effluent flows and concentrations was determined to be 64.2 mg/L-N. Please see the following tables that present the calculations. •