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L11.01 <br /> September 21, 2005 <br /> NOA Project Number: E05104A <br /> L3.3 Current On-Site Sources of Nitrate <br /> The site is fallow agricultural fields. No sources of nitrates besides septic effluent and rainfall are (3 3) <br /> recognized. <br /> L3.3.1 Existing Septic System <br /> One residential septic system exists on the Site. <br /> L3.3.2 Agricultural Contribution <br /> No agricultural contribution was considered since the fields are fallow. <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 for the nitrate loading analysis and should not be used for septic system design <br /> purposes. Typically,use estimates for the sizing of septic systems include a peak use factor,whereas <br /> the numbers discussed here are based on long-term averages. <br /> A small two to three bedroom residence and shed are present on Lot 7. According to <br /> communication with Stacey Griffith on September 12, 2005, these two structures will be <br /> demolished. Each future home is presumed to be four to five bedrooms potentially occupied by up l 3 <br /> to five people over the long term. A second dwelling unit,which could be constructed on the parcel, l <br /> could be occupied by up to three people. Therefore, a total of eight people per parcel will be used <br /> Lto calculate the residential septic tank usage for each parcel. <br /> The estimated sewage flow rates for use categories are available from a number of references. The <br /> L uses presented below were guided by the San Joaquin County On-Site lVastemater Disposal Standards <br /> (2003), Crites and Tchobanoglous (1998), and EPA (1980).The text from Crites and Tchobanoglous <br /> (1998) (Table 4-2) indicates that the typical residential use rate is 70 gallons per day. The EPA <br /> (1980) Design Manual(Table 4-6) indicates the typical use rate is 45 gallons per day for a resident. 3'ir9 <br /> The following tables presents the septic waste water uses associated with the Site. The rates <br /> ` presented from 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 /> L <br /> p 4 <br /> 1w <br /> '-'44 <br />