Laserfiche WebLink
2nd Addendum-Soil Suitability&Nitrate loading Study Page 2 <br /> Oak Farm Winery,Lodi CA <br /> Project No. 670.1 C <br /> November 20,2013 <br /> System Personnel Number Flow Rate Schedule Annual Out ut <br /> Existing Res. Residents 6 50 GPD 365 Da r 109,500 gals <br /> roductioo/fastin Full Time Employees 4 15 GPD per Person 260 Days/Yr 15 600 gals <br /> (Proposed) Pan Time Employees* 5 8 GPD per Person 260 Days/Yr 10,400 gals <br /> Tasting Room 100 4 GPD per Person 260 Days/Yr 104,000 gals <br /> Visitors•" <br /> Events Full Time Employees 4 l GPD r Person 260 Da r 15,600 s <br /> Fxistin Part Time Em to s' 4 8 GPD r son 260 Da r 10,400 s <br /> Guests'•" 150 8 GPD per Person 16 DaysNr 19,200 s <br /> Annual Flow 284,700 <br /> ' Assumes part timers work approx.half time. <br /> •• Assumes 300 visitors per 6-day week. <br /> "•• Assumes 4 restroom visits each day per person at 2 gals.per use. <br /> # Actual number of residents. <br /> 7.2 Nitrate Loading Calculation <br /> The following discussion summarizes the revised total nitrate loading from the proposed new <br /> system as well as the existing systems. An estimate is made of total nitrate load as calculated <br /> from a simple mass-balance approach. The Hantzsche and Finnemore model is then used to <br /> estimate the nitrate concentration in groundwater. The calculation worksheet(s) are attached. <br /> The following table summarizes the revised flow-rate calculation with nitrate effluent loads for <br /> the anticipated and existing septic systems. <br /> System Personnel Ave.Daily Effluent Vol.Weighted <br /> Flow Cone. N Ave. <br /> Existing Res. Residents 300 GPD 44 mvjL 16.9 m <br /> roduction/rastin Full Time Employees 43 GPD 80 mgtL 4.4 mgfL <br /> (Proposed) Part Time Employees 29 GPD 80 mgfL 3.0 m <br /> Tasting Room Visitors 285 GPD 80 mgfL 29.2 m <br /> Events Full Time Employees 43 GPD 80 mWL 4.4 m <br /> (Fyisting) Part Time Em to es 29 GPD 80 m L 3.0 mWL <br /> Guests 53 GPD 80 mWL 5.4 m <br /> TOTALS 782 GPD 65.6 mull <br /> The total load will be 782 GPD at 65.6 mg/L nitrate concentration. The Hantzsche and <br /> Finnemore model is then used to estimate the nitrate concentration in groundwater. The <br /> calculation worksheet(s) are attached. <br /> System Acres Daily Flow Effluent Denitrification Percolation N Loading <br /> Cone. N. Factor d <br /> 3 System Total 1 31 1 782 GPD 65.6 m L 25% 7.85 in. 117 lbs <br /> The existing and proposed septic systems will produce a total groundwater load of 117 <br /> pounds per year of nitrogen. This represents an average concentration at the groundwater <br /> 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone: (209)569-0293 <br /> Modesto,CA 95356 Fax: (209)569-0295 <br />