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January 4,2006 NOA Project Number: E05166B 4.4 Future On-Site Sources of Nitrate 4.4.1 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 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 7.A three bedroom home is presumed to be occupied by up to four people over the long term.A second dwelling unit, occupied by a potential three people,could be placed on the parcels as well. Therefore, a total of seven 12eol2le per pArrel will be used to calculate the residential septic tank usage for parcel 7. K A four bedroom home ' present on Parcel 5. A four bedroom home is presumed to be occupied by up to five people over the long term.A second dwelling unit, occupied by a potential three people, coi—Ti abe place on the parcels as well. Therefore, a total of eight people per parcel will be used to calculate the residential septic tank usage for parcel 5. -V /For Parcels 1 through 4 and 6, it is likely that a two to three bedroom home will be built. For this calculation a three bedroom home will be used.A three bedroom home is presumed to be occupied by up to four people over the long term. A second dwelling unit, occupied by a potential three people, could be placed on the lot as well. Therefore,a total of seven people per parcel will be used to calculate the residential septic tank usage for the 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 lFlasten�ater Disposal Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The text from Crites and Tchnhanooln„� ` (1998) (Table 4-2).indicates that the typical residential use rate is 70gallons �r d&y. e EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 45 gallons per day for a resident. NOW The following tables presents the septic waste water uses associated with the Site. The rates presented from the references provide general guidance but do not always reflect a match in usage. Im Careful examination,professional judgement, and experience are necessary to select a reasonable flow rate estimate. The flow rates selected for maximum uses associated with this project are presented in the following table. 4