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June 13, 2006 1 NOA Project Number: E05164A ri3.3 Current On-Site Sources of Nitrate Fil The site is vacant land with a produce market.The market is located on the northwest corner of the sect perty No sources of nitratesesi`des septic effluent and rainfall are recognized. �, 3.3.1 Existing Septic System One residential septic system exists on the Site. i Fj3.3.2 Agricultural Contribution No agricultural contribution was considered since the site is vacant. 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 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. Fi The produce market on Parcel l s proposed to have two employees per day and serve on_ave rage f 200 customers per day. We understand that the store is planned to be open eight hours per daTM y,'� seven days per week. On Parcel 2, the maximum eLected on usage would-be-fx-om-the_... development of a one to two bedroom residence. The estimated sewage flow rates for use categories are available from a number of references. The uses presented below wereguided by the San Joaquin County On-Site Wastewater Disposal Standards -� (2003), Crites and Tchobanoglous (1998), and EPA (1980). No specific category is indicated for produce stand customers. Therefore,we estimate that 2.0 gallons per day for each customer. The references indicate that 14 gallons for each employee is typical for an office worker (Crites and Tchobanoglous, 1998). The t fr Crites and Tchobanoglous (1998) (Table 4-2) indicates that the typical residential use rate 0 ons per day. The EPA (1980) Design Manual (Table 4-6) indicates the typical use rate j 45 ns per day for a resident.A two bedroom home is presumed to be occupied by up to three f tl4le over the long term.Thcrefdfc,a=tot of ti ee oe p Wiper parcel will be used to calculate the 1 residenirial septic tank usage for�parcel two. 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. Careful examination,professional judgement, and experience are necessary to select a reasonable 4 ! 1 [ I 1