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New Moose Lodge Nitrate Loading Study Page 3 of 7 Our Project Number: E07175A November 5, 2007 y'3.2 Contribution of Rainfall An estimate of the quantity and quality of rainfall was required for the nitrate loading analysis. The estimate of deep percolation of rain is based on the average monthly precipitation of rainfall and evapotranspiration for Lodi, California. The estimate first determines whether the average monthly precipitation exceeds average monthly potential evapotranspiration. If so, then the difference is potential deep percolation. This method does not consider runoff. See Plate 9 for the data and calculation. y Average potential evapotranspiration was obtained from the California Irrigation Management Information System (CIMIS). Lodi is located within evapotranspiration zone number 12. Average rainfall was obtained from the Western Regional Climate Center (Station 045032). Based on this method, the average deep percolation of rain for the Lodi area is estimated to be 5.76 inches. The nitrate concentration of rain fall was estimated to be 1 mg/L-N (Hantzsche and Finnemore, 1992). 3.3 Current On-Site Sources of Nitrate There are no current on-site sources of nitrate except for natural processes. The blueberry plants on the property are not being actively maintained at this time. 3.4 Future On-Site Sources of Nitrate 3.4.1 Quantity and Quality of Domestic Wastewater From Proposed Project The following discussion is for determining the long-term waste water flow generated from the proposed construction 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. The sportsman's club is proposed to have four employees per day during the week and six per day on the weekend. A total of 40 customers per day is anticipated during the week, with 150 customers per day on the weekend. We understand that the club is planned to be open approximately eight hours per day, seven days per week. The club includes standard restroom facilities and a commercial kitchen. In addition to the above uses, two gatherings per month are anticipated in which 150 people will attend. An annual New Year's Eve party will draw approximately 210 people. 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 Wastewater Disposal Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate that 13 gallons for each employee is typical for an office worker (includes sportsman's club workers), and 5 gallons is typical for each customer (Crites and Tchobanoglous, 1998). ,.044 902 Industrial Way-Lodi,CA 95240-209.367.3701 -Fax 209.369.4228 ©2007 Neil 0.Anderson&Associates,Inc