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February 22, 2006 NOA Project Number: E06010A The estimated sewage flow rates for use categories are available from a number of references. The uses presented below were guided b the San Joaquin Coun On-Site Wastewater Disposal Standards Y J 9 �' � (2003), Crites and Tchobanoglous (1998), and EPA (1980). The text from Crite�z jTchobanoglous (1998) (Table 4-2) indicates that the typical residential usera.te is ons per ay. t 1 The EPA (1980) Design Manual(Table 4-6) indicates the typical use rate 1 45 gallons pe ay for a resident The higher estimate of Crites and Tchobanoglous will be used for r a use. /The text from Crites and Tchobanoglous 1998) able 4-2 indicates that the typical office worker ( (�' ) (includes commercial workers) use rate is 13 gpd. The EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 14.5 gpd for an office worker. Since the Crites and Tchobanoglous !� (1998) information is the most current available, our office believes it provides the best estimate of j waste water flow for the office/commercial worker category. Therefore, 13 gpd will be used for li each employee. To identify the impact to the wastewater flow from customer visits (including i I /guests at marketing events), each visit to the Site is estimated to generate 5 gallons of waste water. /Similarly, each truck driver entering the facility is anticipated to generate 5 gallons of waste water. The following table 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. fill, 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 next. Typical Quantity of Effluent Category Total People per Average Quantity per Average Daily Flow Fi Day Per Parcel Residential 7 70 gpd/resid 7 residents*70 gpd= 490 gpd Commercial-- 22 Mon-Fri 22 employees*13 gpd*,5/7 =204 gpd I Employee $St-Sun 13 gpd/employe g employees* 13 gpd*2/7 =30 gpd Commercial— r l[ Truck Driver 5 gpd/drive 10 drivers*5 gpd = 50 gpd l Commercial-- 10 Sat-Sun r g ; 10 customers*.5 gpd 2/7 = 7 gpd 5 gpd/customer � -�. Customer 75 special event 75 customers-�*5 .:X3%365_ = 3 gpd Note —gpd is gallons per day;5/7 is a conversianf r the 5-day week;2/7.is a conversion for the weekend; -1/365 in a conversion for three events per year. or the subject property, the total daily waste water quantity i784 gallonsper day. - The average total nitrogen concentration of domestic waste water is-nor4nali considered to be 20-85 mg/L-N with 35 to 45 mg/L-N being typical (Crites and Tchobanoglous, 1998). It is } estimated that commercial use will have higher concentrations of total nitrogen when compared to residential use. It is es at Bic average centration of total nitrogen in waste water for the Fil, project is approximately 6 mg/L-N over the long to m. A conservative total nitrogen j 5