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January 16,2007 NOA Project Number: E07009A Commercial Buildi The commercial building is proposed to have approximately ten (10) employees per day. The number of customers is estimated to be 32, based on the number of parking spaces on site.The t building will be open six days a week with normal business hours. Our office was provided with water meter records, for buildings in the area with similar square footage as the proposed commercial building on site, to determine average sewage flow rates. Our office was provided with this information for five (5) sites by the City of Lodi Public Works.The winter months'rates were used in order to minimize water flow related to irrigation (which does not ! enter the septic disposal area). The average flow rate for the buildings in the winter months was approximately 165 gallons per day (gpd). 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 lFastewater Disposal Standards # (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate that ten (10) gallons for each employee is typical for a shopping center employee and two (2) gallons is typical for. F a shopping center customer. The total estimated sewage flow for the commercial building would be estimated at approximately 164 gpd,which is consistent with the aforementioned commercial building flow average. ((2gpd x 32 customets)) +((10gpd x 10 employees)) =164gpd � �f # / off _ /GGj Gas Station & Convenience Store / The gas station and convenience store is proposed to have approximately two (2) employees per shift, six (6) total. The building will be open 24 hours a day, seven days a week. Our office was provided with water meter and customer receipt records from the 76 station and convenience store located at the northeast corner of Interstate 5 and Walnut Grove Road in Thornton, California. The estimated sewage flow rate for a gas station employee is approximately 13 gpd. The 76 station had a daily average of 1,500 customer receipts and a flow rate of 913 gpd,giving an average use of 0.56 gallons per customer per day (with the subtraction of 78 gpd, or six (6) gas station employees at 13 gPd)• . The 76 station is located beside Interstate 5 and gets heavy use.The Farmington station will be in a less populated area with less use. It is estimated that the use will be on the order of 25 percent less usage,remaining in a flow of approximately 708 gpd: ((Mgpd x 1,125 customers) +(13gpd x 6 employees)) = 708gpd a _ � �� + '�3