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TABLE 3 WINERY DOMESTIC WELL: ANALYTICAL RESULTS OF TESTED CONSTITUENTS SAMPLE ID NITRITE AS NITROGEN TKN/NH., TOTAL ALKALINITY pH/Ec t Well 24.7 mg/L ND 190 mg/L 7.59/682 umhos/cm MCL= 10 mg/L Non-Detect Calculation on the Alkalinity Requirement for Nitrification The nitrate-nitrogen loading calculations are contingent upon the environmental factors required for nitrification to occur. These conditions include soil pore-space oxygen content, soil temperature, pH, electrical conductivity, organic matter, cation exchange capacity, and alkalinity. Alkalinity in wastewater effluent is derived from the water source, in addition to the introduction of wastes. Nitrification consumes approximately 7.1 mg of alkalinity for every mg of ammonia- nitrogen (NH4-N) oxidized. Nitrification of the Total Kjeldahl Nitrogen (TKN) concentration of 223 mg/L, as determined below, would require: 223 mg/L NH4-N x 7.1 mg CaCO3 = 1,583 mg/L alkalinity. The alkalinity in the well water was determined to be 190 mg/L. The alkalinity determined from the septic tank effluent sample (A&L Laboratories) was 983 mg/L. 190 + 983 = 1,173 mg/L alkalinity. Therefore, an approximate deficient value of 1,583 mg/L - 1,173 mg/L = 410 mg/L of additional alkalinity must come from soil alkalinity, or another source to provide a sufficient concentration for complete nitrification of the effluent to occur. E. SURFACE WATER INFORMATION AND CALCULATIONS NLS§3.2. As referenced, the subject facility occupies two full APN Parcels and a partial third APN Parcel. For the Nitrate Loading Study, this acreage does not include surrounding vineyards and orchards that are part of the winery property,which totals 89.18 acres. The acreage of the winery facility exclusively is 48.4 acres. The actual winery facility(buildings, tank farms, concrete paved areas, etc.) and the lined wastewater treatment/stormwater ponds total 12.6 acres. This 12.6 acre area is considered impervious. The remaining area is specified as gravel and undeveloped areas, which can be considered pervious, and totals 35.8 acres. The existing leachfield area is 0.97 acres of this 35.8 pervious acres. These land use designated areas are delineated in the Site Plans produced by Advanced Design Group. The following Mass Balance Approach utilizes these referenced area delineations correlated with Available Rainfall and Net Rainfall Recharge: Available Rainfall= 13.5" (1.13 ft) Net Rainfall Recharge= 10.0" (0.833 ft)26%reduction based on the gross area correlated with the reduction in area of the pervious area. Pervious area: Undeveloped, open areas=35.8 ac: 35.8 ac x 325,851 gals/ac-ft x 0.833 ft=9,717,333 gals (R1) Page -5- Chesney Consulting