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i <br /> T <br /> January 3,2006 <br /> NOA Project Number: E05164A <br /> 3.3 Current On-Site Sources of Nitrate <br /> The site is vacant land besides the market on the northwest corner of the subject property. No <br /> Fsources of nitrates besides septic effluent and rainfall are recognized. <br /> FI 3.3.1 Existing Septic System <br /> One residential septic system exists on the Site. <br /> 3.3.2 ;Agricultural Contribution <br /> t ' No agricultural contribution was considered since the site is vacant. <br /> 3.4 Future On-Site Sources of Nitrate <br /> F13.4.1 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 for the nitrate loading analysis and should not be used for septic system design <br /> 1 purposes. Typically,use estimates for the sizing of septic systems include a peak use factor,whereas <br /> F1the numbers discussed here are based on long-term averages. <br /> The produce market is proposed to have two employees per day and serve on average 200 <br /> customers per day. We understand that the store is planned to be open eight hours per day, seven <br /> Rdays per week. <br /> The estimated sewage flowrates for use categories are available from a number of references. The <br /> uses presented below were guided by the San Joaquin County On-Site WlastewaterDisposal Standards <br /> (2003), Crites and Tchobanoglous (1998), and EPA s cific category is indicated for <br /> produce stand customers' fore,we estimate Qt 2.0allons er day for each customer. The <br /> references indicate earl4 a for each employeels-toical for an office worker (Crites and <br /> Tchobanoglous, 1998). <br /> The following tables presents the septic waste water uses associated with the Site. The rates <br /> presented fioni the references provide general guidance but do not always reflect a match in usage. <br /> Careful examination,professional judgement, and experience are necessary to select a reasonable <br /> flow rate estimate. The flow rates selected for the uses associated with this project are presented <br /> next. <br /> F1 <br /> F1 <br /> 4 <br /> n <br /> F! <br />