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. n December 12,'2006 NOA Project Number: E06094A Based on this method, the average deep percolation of rain for the Stockton area is estimated to be 4.67 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and - Finnemore, 1992). The deep infiltration of rain was estimated to be 4.67 inches by the method previously discussed. However,it is:our experience that the soils in the area have a fairly rapid infiltration rate. Based on this,we believe our initial estimate may underestimate the amount by several inches. We believe the actual deep infiltration of rain on the site is approximately six (6) inches. Six (6) inches was used for the nitrate loading estimate. 3.3 Current On-Site Sources of Nitrate Current on-site sources of nitrate include the two current septic systems associated with the two residences on the property. No additional sources of nitrates besides septic effluent, groundwater and rainfall are recognized. 3.4 Future On-Site Sources of Nitrate f a Y 3.4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project The following'discussion is for determining the long-term waste water flow generated from the proposed residences or commercial usage for the nitrate loading analysis and should not be used for septic system design purposes. Typically,use estimates for the sizing of septic systems include a } peak.use factor,whereas the numbers discussed here are based on long-term averages. A three bedroom home is present on parcel four. A three bedroom home is presumed to be occupied by up to four people over the long term. A four bedroom house is located on parcel one. A four bedroom home is presumed to be occupied by up to five people over the long term. For the purpose of the NLS,we will assume that a four bedroom home could be built on each vacant parcel;two, three and the Designated Remainder. A four bedroom house is presumed to be occupied by up to five people over the long term. Therefore, a total of five people per parcel will be used to calculate the maximum potential residential septic tank usage for each of the vacant parcels. + The estimated sewage flow rates for use categories are available from a number of references. The { uses presented below were guided by the San Joaquin County On-Site Wastewater Disposal Standards t (2003), Crites and Tchobanoglous (1998), and EPA (1980).The text from Crites and Tchobanoglous (1998) (Table'4-2) indicates that the typical residential use rate is 70 gallons per day. The EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 45 gallons per day for a resident. li 5 � l ti-