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L <br /> LJune 12, 2006 <br /> NOA Project Number: E06061A <br /> LJ3.3 Current On-Site Sources of Nitrate <br /> Current on-site sources of nitrate include domestic waste water from the existing three-bedroom <br /> Lresidence and rainfall. <br /> / 3.3.1 Existing Septic System <br /> L Based on permits reviewed at the EHD (Section 3.5 of the SSS) and personal communication with <br /> Mr. Hoffman (May 10, 2006), one septic system is located on the Site associated with the existing <br /> residence. One septic system near the shop has not been used in 15 years. A third system,which <br /> �' was installed in 1972 to service a mobile home,was recently certified by the EHD as abandoned. <br /> L /3.3.2 Agricultural Contribution <br /> The non-developed portion of the Site is used as a vineyard. According to Mr. Hoffman, the soils <br /> Lof the fields are tested every two years for nutrients,including nitrogen. The plant tissue is tested <br /> annually. The testing is conducted by the vineyard's pest control advisor. Because the vineyard is <br /> tested regularly to ensure nutrients are applied at agronomic rates,no agricultural contribution is <br /> included in the nitrate loading calculation. <br /> ✓3.4 Future On-Site Sources of Nitrate <br /> A <br /> 6' d.4.1 Quantity and Quality ofSeptic Wastewater From Proposed Project <br /> L The following discussion is for determining the long-term septic waste water flow generated from <br /> the proposed winery for the nitrate loading analysis and should not be used for septic system design <br /> purposes. Typically,use estimates for the sizing of septic systems include a peak use factor,whereas <br /> the numbers discussed here are based on long-term averages. Winery process water is not <br /> considered in the calculation. <br /> According to information on file at the San Joaquin County Planning Department, two employees <br /> per day are anticipated Monday through Friday for the winery, and two employees per day are <br /> anticipated Thursday through Sunday for the tasting room. A total of 20 customers per day are <br /> anticipated Thursday through Sunday only. In addition to standard operation, four marketing events <br /> per year are The events are anticipated to run approximately seven hours in length and <br /> to draw 20 0 40 guests. <br /> I <br /> The existing three-bedroom residence has the potential to be occupied by up to four people over the <br /> long term. A second dwelling unit,which could be constructed on the parcel, could be occupied by <br /> up to three people. Therefore, a total of seven people will be used to calculate the residential septic <br /> tank usage. <br /> V <br /> 4 <br /> 6. -t44 <br /> 6 <br />