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Traylor Shea Precast i Page 10 of 14 <br /> Our Project Number. E071�fB <br /> November 29, 2007 <br /> Based on this method, the average deep percolation of rain for the North Stockton area is <br /> estimated to be 4.67 inches. The nitrate concentration of rainfall was estimated to be 1 mg/L-N 7.Z <br /> (Hantzsche and Finnemore, 1992). <br /> II.3.3 Current On-Site Sources of Nitrate <br /> There are no current on-site sources of nitrate except for natural processes. C3.,� <br /> II.3.4 Future On-Site Sources of Nitrate „t <br /> 77.3.4.1 Quantity and Quality of Domestic Wastewater From Proposed Project <br /> The following discussion is for determining the long-term waste water flow generated from the <br /> proposed construction for the nitrate loading analysis and should not be used for septic system <br /> design purposes. Typically, use estimates for the sizing of septic systems include a peak use <br /> factor, whereas the numbers discussed here are based on long-term averages. <br /> Phase I of the project, the manufacturing facility and office building, is anticipated to utilize 20 <br /> employees per eight-hour shift, two shifts per day, Monday through Friday. No customers are <br /> expected. <br /> Phase II of the project, the additional manufacturing building to be constructed by Conte <br /> ` Materials Service, Inc., is anticipated to add five to six employees per work day to the total <br /> volume, according to Gene Conti (Personal Communication, November 27, 2007). <br /> The estimated sewage flow rates for use categories are available from a number of references. <br /> The uses presented.below were guided by the San Joaquin County On-Site Wastewater Disposal <br /> Standards (2003), Crites and Tchobanoglous (1998), and EPA (1980). The references indicate <br /> ` that 13 gallons for each employee is typical for an office worker (also appropriate for <br /> manufacturing workers) (Crites and Tchobanoglous, 1998). <br /> The following tables present 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 <br /> usage. Careful examination, professional judgment, and experience are necessary to select a <br /> reasonable flow rate estimate. The flow rates selected for the uses associated with Phase I of <br /> this project are presented next. <br /> Table 6. <br /> TVpical Quantity of Effluent Phase 1). <br /> Category Total People Average Quantity per Average Daily Flow per Parcel <br /> per Day Person <br /> Employees 40 13 gal/day/employee (40 employees * 13 gpd * 5/7) = 371 gpd3 � <br /> Notes:gpd is gallons per day. 5/7 is a conversion factor for the 5-day work week. <br /> r �y� <br /> r'fi l�L '. Q!!E3Ctcais /�c'l-��/�` C/�'ir�c. L!S/-�/.r/P�[�XiGZ�o./ ��ji •a`�4 6/-Y�5Si.8�G <br /> irJT.faY,lc7�.�1 � zgt�e= �?�irr�cs •u�ro7<r�si�7i� sr-s��r `�'� �� <br /> 7,Zf Y,069 us7l//e%a J; sr��icts� <br /> L 902 Industrial Way•Lodi,CA 95240•209.367.3701 •Fax 209.369.4228 02007 Neil 0.Anderson&Associates,Inc <br />