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r <br /> Mr. Sandi De Jong <br /> September 25,2003 <br /> Page 14 <br /> Table 7. <br /> Summa of Nitrate Mass Balance Analysis. <br /> Calculation Result Acres Average Effluent Leachfield Deep Percolation <br /> _ c _* (A) Daily Concen- Denitrifi- of Rainfall(R) <br /> Flow(Q) tration cation(d) (Plate 1) <br /> (Table 2) (Nw) <br /> see Plate 9 1 9.9 m -N 1 3.5 1 LL2d 45 m -N 30% 6.84 in <br /> * Maximum co urinate,level(MCL)for Nitrate in drinking water is 10 mg/L-N.Estimate does not include the <br /> contrib m agriculture:- <br /> Based on the method and assumptions described,the result of the nitrate loading balance <br /> indicates the site will not cause a build up of nitrate in ground water above 10 mg/L-N over the <br /> r <br /> long term. <br /> 8.0 CONCLUSIONS AND RECOMMENDATIONS <br /> A satisfactory percolation rate was achieved on the parcel in the area of the proposed septic <br /> system leach line. A nitrate loading balance was performed for the proposed business use. Based <br /> on the assumptions used in this report and assumptions of the Hantzshe& Finnemore equation, <br /> wd project will not cause a long term buildup of nitrates above 10 mg/L-N <br /> in te believe the Uroposehe ground water. Our specific recommendations for the project are as follows: <br /> -Install tamper resistant water meters to directly or indirectly meter waste water flow the <br /> septic system. Monitoring review should be performed each year by staff of <br /> Environmental Health Department or by our office. Should the average daily flow <br /> rates measured exceed the 732 gallons per day, average daily flow, additional S <br /> monitoring of ground water or nitrate removal will be necessary. <br /> .,,,,�r, -�- <br /> -Install the 100 percent replacement area leach f d. A manu diversion valve should <br /> be utilized to alternate each field severa times per year. We recommend <br /> installing 4,000 gallons of tank size to promote clear effluent and denitrifica 'on. <br /> Follow the San Joaquin County Sewage Standards wherr relevant. <br /> .r <br /> rpE RSO <br /> 1 <br /> r <br /> O � <br /> �rsoc. <br /> r <br />