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L 11400 %./ <br /> LJune 10,2005 <br /> NOA Project Number: E05070A <br /> L3.3.2 Agricultural Condrbud'on <br /> LBecause the Site will not be used for agriculture once it is developed, no agricultural contribution <br /> was considered. <br /> 3.4 Future On-Site Sources of Nitrate <br /> 3 4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project <br /> LThe following discussion is for determining the long-term waste water flow generated from the <br /> proposed office for the nitrate loading analysis and should not be used for septic system design <br /> Lpurposes. Typically,use estimates for the sizing of septic systems include a peak use factor,whereas <br /> the numbers discussed here are based on long-term averages. <br /> For the proposed office and mini-storage facility,Mr. Greer indicated that he anticipates a single <br /> employee for ten hours a day seven days a week. Mr. Greer also indicated that he anticipates four to <br /> ten customer restroom visits per day. <br /> The text from Crites and Tchobanoglous (1998) (Table 4-2) indicates that the typical office worker <br /> (includes commercial workers) use rate is 13 gpd. The EPA (1980) Design Manual (Table 4-6) <br /> indicates the typical use rate is 14.5 gpd for an office worker. Since the Crites and Tchobanoglous <br /> (1998) information is the most current available,our office believes it provides the best estimate of <br /> waste water flow for both the residential and office worker categories. Therefore, 13 gpd will be <br /> Lused for each office worker. To identify the impact to the waste water flow from customer visits, <br /> each visit to the Site is estimated to generate 5 gallons of waste water. <br /> LThe following table presents the septic waste water uses associated with the Site. The rates <br /> presented from the references provide general guidance but do not always reflect a match in usage. <br /> Careful examination,professional judgement, and experience are necessary to select a reasonable <br /> L flow rate estimate. The flow rates selected for the uses associated with this project are presented in <br /> the following table. <br /> Table 1. <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 /> Employee 1 13 gal/day/person 1 residents/day* 13 gpd/person _ <br /> = 13 gpd <br /> Visitor 10 5 gal/visit/person 10 visitors/day*5 gpd/person <br /> = 50 gpd <br /> LNote —gpd is gallons per day. <br /> 4 <br /> L <br /> "44L <br />