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rB. Alkalinity Requirements for Nitrification For nitrification to occur, alkalinity in the domestic water and the percolating effluent must be consumed. The nitrate-nitrogen loading projections on Page 10 are contingent upon the environmental factors required for nitrification to occur. Alkalinity in wastewater effluent plays a role in nitrification and is derived from the domestic water supply and the introduction of wastes to the wwater. Total Alkalinity water chemistry from the on-site domestic well was determined to bd'336 mg/L. Waste introduction into the proposed septic system may include small amounts of wine waste which will be acidic. Consequently, nitrification may be inhibited due to insufficient alkalinity from both the domestic water supply and the introduction of wastes to the septic system. Nitrification consumes approximately 7.1 tng of alkalinity for every milligram of ammonia- nitrogen(NH4 N) oxidized. Nitrification of the average Total Nitrogen (TN) concentration of 112 mg/L, (See Page 10) would require: 112 mg/L NHa N x 7.1 mg CaCO3 =795 mg/L alkalinity. Therefore, the alkalinity in the current domestic water supply at 336 mg/L will be theoretically deficient and nitrification may be inhibited. It can be confidently assumed that the alkalinity concentration will decrease further in the new, deeper on-site well. C. Mounding Analysis Because the groundwater is comparatively deep below the proposed location of the disposal area at approximately 68 feet, Mounding Analysis is not required or necessary. This groundwater elevation could not be determined from the on-site well,but was determined from the well on the property adjacent to the west. If it is determined at some time in the future that mounding effects from the effluent encountering an unknown restrictive soil strata are preventing proper effluent treatment and disposal, the existing leachlines that currently serves the house can be reconnected and the 100% replacement area south of the primary filter bed may have to be activated. This may occur prior to failure of the primary filter bed. IV. SEPTIC SYSTEM OPERATIONAL CRITERIA, AND NITRATE-NITROGEN IMPACT MITIGATION A. Septic System Operation and Wastewater Disposal System - ERD Specifications Under EHD guidelines, any daily maximum flow must be used for sizing purposes. As a small winery facility, the proposed Windmill Winery facility has no restrictions on the number of events per year, as does a Boutique Winery. Wastewater flow volume projections for facilities in unsewered areas of San Joaquin County have been historically and typically calculated under a number of variables, as illustrated in the following list: 1. Published Data in the San Joaquin County Sewage Standards and scientific literature. 2. Number of bathroom fixtures for a facility, or a calculated bathroom use per capita. 3. Number of parking spaces for a facility. 4. Projected maximum number of people on-site for any given event. 5. Historical wastewater flow data from an existing or comparable facility or structure. Page-7- Chesney Consutting