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1 4640 E.Woodward Avenue Addendum-Revised Soil Suitability and Nitrate Loading Study Prepared by Kleinfelder,Inc. July 13,2006 ' 4.0 PROPOSED USE ' The 4640 E. Woodward Avenue site consists of a 5.83 acre-parcel, with a single family residence and game room constructed in the north east portion of the site. A paved parking area has been constructed west of the residence and game room, and a storm drainage area is ' located west of the parking area. A septic system consisting of two septic tanks and a leach field has been constructed south of the game room. Please refer to Figure A-O for a site plan prepared by Edmond Jacobs Architect. ' Wastewater Volume Calculations The 2011 GTI addendum concluded that the religious assembly would consist of ' approximately 80 people over the course of a typical Saturday, 150 people over the course of - a typical Sunday, but not more than 50 people at any one time on either day. From Monday to Friday, 6 or 7 people are expected to be present. Given these parameters, GTI estimated ' waste water/sewer generation of 3,600 gallons per week. Reportedly the proposed commercial kitchen will serve on a weekly basis on Saturday and ' Sunday 250 to 300 meals. Plus they plan on holding nine (9) festival events per year that will serve an estimated 500 meals over the weekend. The commercial kitchen will not have additional restrooms. It will have a grease trap intercept as shown in Figure A-0. From two separate online sources, the typical wastewater flows from a commercial restaurant ranges from 2.0 to 4.0 gallons per day per unit; unit=meal (gpd/u). They estimate the typical ' flow to be 2.6 to 3.0 gpd/u. For the purpose of nitrate loading calculations, the average waste/sewage flow per week for ' the commercial kitchen is estimated to be: 3.0 gal 3.0 gal ' -(300 meal x meal x 43 weekends) + (500 meals x meal x 9 weekends) = 38,700 + 13,500 = 52,200 gallon per year/52 weeks/year - 1000 gallons per week ' Combined flow of 3,600 gallons per week from the temple and residence with 1000 gallons ' per week from the kitchen gives a total of 4,600 gallons per week. Nitrate Loading Calculations ' Per SJCEHD requirements, the following summarizes our nitrate loading calculations for the combined flows as discussed above. We have used the Hantzsche and Finnemore (1992) Predicting Groundwater Nitrate-Nitrogen Impacts. The parameters and procedures are ' discussed in detail in the Kleinfelder, Inc. Study(attached in Appendix A). The Kleinfelder, Inc. Study estimated that an average waste/sewage flow of over 10,200 ' gallons per week would be required to exceed the state drinking water standard for Nitrogen Ground Zero Analysis, Inc. 3 ' 16232 Nitrate Loading Add 170317.docx