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lrerracon Soil Suitability / Nitrate Loading Study Buddhist Temple Proposed Dormitory 2 Stockton, California July 11, 2019 a Terracon Project No. NA177056 Table 10. Summary of Nitrate Mass Balance Equation. Year Result (Nc)* (mg/L- N) Acres (A) Average Daily Effluent (Q) (gpd) (Nw) (mg/L-N) Effluent Deep Concentration Percolation Leach Field Denitrification (d) of Rainfall (R) (in) 2006 10.8 4.60 730 56.5 30 5.76 2012 12.6 4.60 850 59.82 30 5.76 2019 Septic System No. 1 Existing 5 Bedroom Residence 6.7 4.60 350 45 30 4.49 Septic System No. 2 Assembly Hall Daily Visitors 2.9 4.60 50.4 85 30 4.49 7 Full Moon Events April — New Year Event 5 Full Moon Events ' (July, August, October, November, December) Septic System No. 3 Proposed 12 Bedroom Dormitory 11.8 ---. 4.60 840 21.4 45 30 4.49 Total / A * Maximum contaminant level (MCL) for nitrate in drinking water is 10 mg/L-N. Based on the nitrate loading results, nitrate levels for the existing 5 bedroom residence is 6.7 mg/L-N. The assembly hall daily visitors and special events is calculated to be 2.9 mg/L-N over the long term for a combined total of 9.6 mg/L-N below the MCL of 10 mg/L-N. The proposed 12 bedroom dormitory is anticipated to further increase nitrate levels by an additional 11.8 mg/L-N for a total of 21.4 mg/L-N above the MCL. As a worst case scenario, the existing 5 bedroom residence and proposed 12 bedroom dormitory have a potential to add 10.5 mg/L-N and 16.9 mg/L-N respectively when two people are calculated per bedroom and both residences are occupied. Therefore, the site has the potential to increase nitrate levels as high as 33.3 mg/L-N. 2.3.6 Impact of Nitrate Loading to Nearby Water Sources Since the subject property is relatively flat, we do not foresee percolating effluent affecting surface water sources. Responsive • Resourceful • Reliable 19