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Trans Sohal Logistics- Nitrate Loading Section Page 10 of 13 Our Project Number: LGS140011 October 8, 2014 Table 3. Estimate of Deep Percolation of Rain for the Site Location Deep Percolation of Rain Stockton — 3.21 inches Based on this method, the average deep percolation of rain for the Stockton area is estimated to be 3.21 inches/year. The nitrate concentration of rainfall is estimated to be 1 mg/L-N (Hantzsche and Finnemore, 1992). 2.3.3 Current On-Site Sources of Nitrate There are no current on-site sources of nitrate except for natural processes. 2.3.4 Future On-Site Sources of Nitrate 2.3.4.1 Quantity and Quality of Wastewater from Proposed Project The following discussion is for determining the long-term wastewater flow generated from the proposed construction of one 900-square foot office building with one low-flow flush toilet as part of a trucking company with truck parking on the 2.22 acre parcel. The office is estimated to have a maximum of 3 employees per day. No other persons are anticipated at the site. However, the system should additionally be designed for occasional visitor capacity, in the event that visitors are present and use the office restroom. A maximum of three visitors per day should be accounted for as a "worst case" scenario. We understand that the office is planned to be open approximately eight hours per day, five days per week. 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 per day is typical for each office employee and 5 gallons per day is standard for each occasional visitor, when utilizing a low-flow flush system (Crites and Tchobanoglous, 1998). The following table presents the septic wastewater uses associated with the Site. The rates presented from the references provide general guidance but do not always reflect a match in usage. Careful examination, professional judgment, and experience are necessary to select a reasonable flow rate estimate. The flow rates selected for the uses associated with this project are presented below. ,.A"A ©2014 Neil O.Anderson&Associates,Inc. A Terracon Company