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n November 19, 2004 NOA Project Number, F1 3.4 Future On-Site Sources of Nitrate 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 residence and business for the nitrate loading analysis. These estimates jn of be a ro riate for se ti to designumo ,sdo n�rain ani ea� factors. The number discussed here are based on long-term averages. For the proposed Parcel the site plan provided b Delta Building Design shows a proposed 7.,300 p p p p Y s uare foot office an a 2 200 opt mobile home. The mobile home will have two bedrooms it is anticipated that is will be occupied by up to rhrta e-a* over the long term. The design shop has four workers,;they work from 8 to 5,Monday through Friday. At most the sign sho would get AM one c er er da that ma use the bathroom. � - G �`�°` �. rte 3 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 . {2003), Crites and Tchobanoglous (1998), and EPA (1980). The San Joaquin County On-Site Vastewater Disposal Standards does not provide a flow rates for residential use and was written primarily for septic system design. / The text from Crites and Tchobanoglous (1998) (Table 4-2) indicates that the typical residential use rate is 79 gallons per day for a resident. The EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 45 gallons per day for a resident. Crites and Tchobanoglous (1998) mentioned that '*bffice ersonY Due to lack of specific published data,we estimate s that a store customer using the restroom will use approximately 5 d/visit. Since the Crites and Tchobanoglous (1998) information is the most current available, our office believes it provides the best estimate of waste water flow for the residential and commercial category. The following table presents the septic waste water uses associated with the Site. The rates Fjpresented from the references provide general guidance but do not always reflect a match in usage. Careful examination,.professional judgement, and experience are necessary to select a reasonable flow rate estimate. The flow rates selected for the uses associated with this project are presented in the following table. F 4 "044