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Soil Suitability/ Nitrate Loading Study -Addendum Irerracon <br /> Buddhist Temple—Thornton Road ■ Stockton, CA <br /> October 19, 2020 ■Terracon Project No. NA177056 <br /> Estimated AverageNo. <br /> Septic Residential/ Quantity <br /> No.of Days Maximum Daily Average Daily Flow <br /> System Building People Per Commercial Per Per Flow(gpd) (gpd) <br /> Number Day Use Person Year <br /> al <br /> 365 days per year= <br /> 1.4gpd <br /> April—Asian 333 people x 5 <br /> New Year 333 C 5 3 333 people x 5 gallons x 3 days <br /> Event gallons=1,665 365 days per year= <br /> 13.7 gpd <br /> 5 Full Moon <br /> Events(July, 150 people x 5 <br /> August, 150 C 5 5 150 people x 5 gallons x 5 days/ <br /> October gallons=750 365 days per year= <br /> November, 10.3 gpd <br /> December <br /> Proposed 12 12 bedrooms x 1 1 bedroom x 100- <br /> 3 Bedroom 12 R -- 365 person x 70 gallons+ 11 <br /> Dormitory gallons=840 bedrooms x 50- <br /> allons=650 gpd <br /> 'Note:Residences calculated at one person per bedroom <br /> Based on the above table, the revised long term average daily flow rates for all three septic <br /> systems is approximately 1,000-gallons per day. Below is a table comparing the 2019 SSNLS <br /> with the 2020 SSNLS Addendum. <br /> Long Term Average Daily Flow Rates <br /> Septic System No. 2019 SSNLS 2020 SSNLS Addendum <br /> (gpd) (gpd) <br /> 1 - Existing 5 Bedroom 350 300 <br /> Residence <br /> 2 -Assembly Hall/Detached 50 50 <br /> Restroom/Special Events <br /> 3 -Proposed 12 Bedroom 840 650 <br /> Dormitory <br /> Total (gpd) 1 J2 1,000 <br /> The EHD additionally approved an adjustm�to the evapotranspiration (ET) rate based on net 4r j /. <br /> rainfall recharge calculation utilizing University of California (UC)plant factors(PF)for established aN 1//11,/70 <br /> landscape plants. Terracon adjusted the estimate of net rainfall recharge from 4.49 inches per <br /> year to 9.05 inches per year based on current land conditions. It should be noted there were no <br /> PF's available for seasonal grasses/vegetation; therefore, Terracon assigned a plant factor of <br /> 0.45 which is an average between desert adapted plants (PF 0.3) and general turfgrass (PF 0.6). <br /> Based on Terracon's prior SSNLS report, "the average concentration for total nitrogen in <br /> residential wastewater will be calculated at 45 mg/L-N and commercial wastewater will be <br /> calculated at approximately 85 mg/L-N over the long term.". Terracon calculated the following <br /> weighted average for the combined residential and commercial effluent concentrations (Nw). <br /> Responsive ■ Resourceful ■ Reliable 2 <br />