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L LApril 9,2007 NOA Project Number: E07045A L ✓3.3 Current On-Site Sources of Nitrate Current on-site sources on the site would include those associated with existing septic systems on the subject property. 3.3.1 Existing Septic Systems One septic system exists on the subject property. ✓3.3.2 Agricultural Contribution No agricultural contribution was considered for the nitrate loading study. No significant long-term Lor future impact is expected from present or future agriculture. /3.3.3 WmeryProcesses Contribution Our office understands from Vem Vierra of Delta Buildings,Inc. that all waste water related to the wine process will be hauled off site. Therefore,no significant contribution from the winery waste water is considered for the nitrate loading study. ✓3.4 Future On-Site Sources of Nitrate k 3.4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project The following discussion is for determining the long-term waste water flow generated from septic system use only of the proposed winery facility. It is our assumption that any winery waste water generated on the site will be hauled off site with proper waste water discharge permitting. No Gcontribution from agriculture is considered in this analysis. r The following septic use estimates are for the purposes of the nitrate loading analysis and should not k be used for septic system design purposes. Typically,use estimates for the sizing of septic systems 1� include a peak use factor,whereas the numbers discussed here are based on long-term averages. The proposed employee number for the wine making process will be three employees during the peak season.Two employees are expected to work in the wine tasting room,which will be open on the weekends for the entirety of the year,excluding the month of January and half of the month of February.The number of customers is unknown,however,based on the number of parking spaces, it is estimated that the maximum number could be as many as approximately 30 per day. L The text from Crites and Tchobanoglous (1998) (fable 4-2) indicates that the typical office worker (includes commercial workers) use rate is 13 gpd. The EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 14.5 gpd for an office worker. Since the Crites and Tchobanoglous (1998) information is the most current available, our office believes it provides the best estimate of L 4 .,44 L