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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C I A T E S INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> April 7,2006 <br /> ` NOA Project Number: E06020A <br /> 1.27 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and <br /> Finnemore, 1992). / <br /> 3.3 Current On-Site Sources of Nitrate <br /> Current on-site sources of nitrate include the current septic systems for the mobile home and trailer <br /> and agricultural fertilizers. If best management practices for farming are being utilized, there should <br /> be minimal nitrogen leaching. No additional sources of nitrates besides septic effluent,groundwater <br /> and rainfall are recognized. <br /> 3.4 Future On-Site Sources of Nitrate <br /> 3.4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project <br /> The following discussion is for determining the long-term waste water flow generated from the <br /> proposed residences or commercial usage for the nitrate loading analysis and should not be used for <br /> septic system design purposes. Typically,use estimates for the sizing of septic systems include a �, I <br /> peak use factor,whereas the numbers discussed here are based on long-term averages. <br /> t� <br /> ` The general store is proposed to havO two employees per,day and serve on average 20t 5! / <br /> customers per day. We understand that- stare-is-planned to be-e.Ren eight hour4TIcfday, seven <br /> days per week. The trailer on the subject property has one bedroom and the mobile home has three > <br /> bedrooms. <br /> The estimated sewage flow rates for use categories are available from a number of references. The <br /> uses presented below were guided by the San Joaquin County On-Site Wastewater Disposal Standards <br /> ` (2003), Crites and Tchobanoglous (1998), and EPA (1980). No specific category is indicated for <br /> general store customers.. Therefore,we estimate thaq.0 gallons per day for each customer, The <br /> references indicate that-14 gallons for each employee i'ty 5 cal for an office worker,which is suitable <br /> for a general store employee (Crites and Tchobanoglous, 1998). <br /> The text from Crites and Tchobanoglous (1998) (Table 4-2) indicates that the typical residential use <br /> ` rate is 70 gallons per day. The EPA (19 80) Design Manual (Table 4-6) indicates the typical use rate <br /> is 45 gallons per day for a resident. <br /> 6' A three bedroom home is present on site along with a trailer. A three bedroom home is presumed to <br /> be occupied by up to four people over the long term. The trailer has.one_bedrQQtn and is expected <br /> to be occupied by a potential two people. Therefore, a total of six people per parcel be used to <br /> 5 <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> r✓ <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,Lodi,Califomia 95240 ■209.367.3701 0 209.369.4228 ■www.noar <br />