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L <br /> LSeptember 30, 2007 <br /> NOA Project Number: E07147A <br /> The tentative site plan provided by Mike Smith Engineering shows that the property will create 147 <br /> L parking spaces to be available for recreational vehicle use. The text from the San Joaquin County <br /> L Onsite Wastewater Disposal Standards (October 2003) indicates that the typical recreational vehicle <br /> use rate per space is 100 gpd. <br /> It is proposed that there will eventually be approximately 10 employees working on site. The text <br /> Lfrom Crites and Tchobanoglous (1998) (Table 4-2) indicates that the typical office worker (includes <br /> commercial workers) use rate is 13 gpd. The EPA (1980) Design Manual (Table 4-6) indicates the <br /> typical use rate is 14.5 gpd for an office worker. Since the Crites and Tchobanoglous (1998) <br /> information is the most current available, our office believes it provides the best estimate of waste <br /> water flow for an office worker is 13 gpd for each employee. <br /> The rates presented from the references provide general guidance but do not always reflect a match <br /> L in usage. Careful examination,professional judgement, and experience are necessary to select a <br /> reasonable flow rate estimate. The flow rates selected for the uses associated with this project are <br /> presented in the following table: <br /> Table 2. <br /> Typical Quantity of Effluent from Commercial Sources. <br /> Category Total People Average Quantity Average Daily Flow <br /> per Day per Person Per Parcel <br /> Employees l U 13 gal/day/person 10 employee/day x 13 gpd/person= 130 gpd <br /> Recreational 14- 100 gal/day/perso 01 147 RV spaces/day x 100 gpd/space= 14,700 gpd <br /> Vehicles <br /> TOT 14,830 gpd <br /> Note —gpd is gallons per day. <br /> The daily septic waste water quantity for the proposed development is estimated to be 14,830 <br /> gallons per day. <br /> L The average total nitrogen concentration of domestic waste water is normally considered to be <br /> 20-85 mg/L-N (Crites and Tchobanoglous, 1998). For the purposes of the nitrate loading estimate, <br /> L the long-term average concentration for total nitrogen in residential waste water is estimated to be <br /> approximately 45 mg/L-N and the long-term average concentration for total nitrogen in employee <br /> waste water is 65 mg/L-N. <br /> LThe adjusted nitrogen long term average using a weighted average is 45.85 mg/L-N. Below is the <br /> long term weighted average of nitrogen in the proposed development waste water. <br /> L <br /> L <br /> 5 <br />