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LUCCA WINERY SOIL SUITABILITY & NITRATE LOADING STUDY APRIL 2013 III. NITRATE LOADING STUDY FINDINGS A. Wastewater Flow Volume Projections and Characteristics _• L Wastewater Flow Volume Projections To determine nitrate-nitrogen loading from the project, wastewater flow volumes will be conservatively determined. Typically, loading projections are based on the maximum or — total number of employees and customers who may potentially use the toilet/sink, etc. on a workday basis. Several variables are involved in estimating wastewater flows from a facility. Wastewater flow volume projections for facilities in unsewered areas have -- been historically and typically calculated under numerous guidelines and scenarios, as illustrated in the following list: 1. Published Data in the San Joaquin County EHD Sewage Standards and scientific literature. 2. Number of bathroom fixtures correlated with bathroom use per capita for a facility. 3. Number of parking spaces at a facility. 4. Maximum number of people (e.g., employees, customers, etc.). 5. Historical wastewater flow data from an existing facility. Since it cannot be adequately determined how many people will use the new restroom on a daily basis, an estimate of assigning three flushes per hour, for the toilet, per day is logical, reasonable, contemporary, and applicable. Archaic Standards of 150 Average Daily Flow (ADF) per toilet are based on old-style toilets with a five gallon flush. New toilets use 1.5 gallons per flush. �- Although numbers of on-site people have not been estimated in the Application, the ADF for sizing criteria must be based on the premise of using a low-flow toilet at 1.5 � gallonsiflush. Anticipated flow volumes are as follows: ; Its 6. A total of 24 flushes/day will be assigned for the toilet (24 flushes/toilet/day = 3 flushes/hr/8 hr day) for a total of 24 flushes/day x 1.5 gals/flush = 36 gals + 0.25 gallons for hand washing x 24 bathroom trips = 42 gallons -" ADF from the new restroom. ii. Wastewater Flow Characteristics It is assumed there will be no cooking, or food production in the restroom. Therefore, there should be no concentrated organic loading. The characteristics of the wastewater flow will be predominately blackwater from toilets, with a comparatively small volume of - graywater from sinks, or other sources of graywater. Additional wastewater constituents may consist of coffee, juices or other similar type liquids to the system. No industrial or commercial chemicals, solvents, etc. are to be introduced into the septic system. From — the anticipated wastewater characteristics described above, the nitrogen emanating Page 18