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JAMES D ROBINSON, PE, CEG Page 6 <br /> March 23, 2010 <br /> fl Project Number 2010-1015 <br /> runoff is ignored (more conservative). The data is located in the Appendix. <br /> fUl Based on the researched data, the average percolation of rain is estimated to be 5.76 inches per <br /> year. The average amount of nitrate contained within rain is considered to be i mg/L. <br /> l� <br /> Current On-site Sources of Nitrate <br /> Currently, there is a residence and irrigated agricultural land. <br /> / Future On-site Sources of Nitrate <br /> In addition to the present sources of Nitrate ) <br /> (current residences , the proposed Center will <br /> provide an additional amount of.Nitrate to the site. Based on the information provided by the <br /> client, there will be no more then ,24' people at the center"as -a--d-01y.-average (Based on the <br /> maximum allowed in the Conditions of Approval). In addition, the building would be considered <br /> a Public Gathering Place with an average effluent of 10 gallons per day per person (San Joaquin <br /> Count Onsiie_W._ante Water Disposal Standards, Page 13) and an average of 24 people per day. <br /> A tal of 240 gallons per day f effluent is anticipated. <br /> The average total nitrogen concentration of domestic waste water is considered 20-85 <br /> mg/L of N with 35 to 45 mg/L of N typical. For this project a average f 35 mg/L ofi <br /> 11 <br /> anticipated of the life of the system. <br /> Based on the fine sand sized particles in the soil, denitrification is anticipated to occur to � <br /> a limited extent. Typical denitrification is within the 10 to 35 percent range. For this site, 15 <br /> percent denitrifaction of the soils and wastewater is anticipated. <br /> Mass Balance of Nitrogen Loading <br /> A mass balance of nitrogen loading was performed to determine the impact from the <br /> JAMES D ROBINSON,PE,CEG ENVIRONMENTAL•ENGINEERING-GEOLOGY <br /> PO BOX 1744,VALLEY SPRINGS,CA 95252 PHONE(209)642-5445•FAX(209)740-4303 <br />