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Soil Suitability&Nitrate Loading Study Page 9 Proposed M2 Winery,2900 Peltier Rd,Acampo CA Project No. 670.1 A May 28,2013 System Effluent Nitrate Conc. Em to ees 60 m Tasting Room Visitors 80 Mal Marketing MV Attendees 80 m Meteoric water Rainwater percolating through the soil is the primary leaching agent carrying nitrates to the groundwater. The estimate of the amount of deep percolation is based, in part of the long- term average annual precipitation and on the average evapo-transpiration rate(ET). The rate at which precipitation exceeds evapo-transpiration is the rate at which percolating meteoric water is available to leach nitrates to groundwater. According to the National Weather Service htt :1/cdo.ncdc.noaa. ov , the mean annual rainfall at Lodi (the nearest reporting station) is 13.84 inches. The rate of evapo-transpiration is available from the website of the California Irrigation Management Information System (CIMIS) (hqp://wwwcimis.water.ca.,-)(Lv/cimi . The average annual evapo-transpiration rate for the Lodi station 12 is 50.3 inches. In recognition of the fact that most of the precipitation falls during the winter months, while most of the evapo-transpiration occurs during the summer, the following table was prepared to provide a month-by-month breakdown. Month Mean Predp.(in.) Mean ET Percobtioa Jan. 3.48 0.79 2.69 Feb. 3.31 1.55 1.76 Mar. 2.87 3.28 - A r. 1.36 5.17 may 0.67 6.58 - Jun. 0.14 7.51 - Jul. 0.0 7.87 - Au . .03 6.85 - 0.31 5.11 - Oct. 1.15 3.29 - Nov. 2.36 1.54 0.82 Dec. 3.34 0.76 2.58 7.85 �3 2\ Based on these data, all of the p olaion curs between November and February, and the total coiation rate is q.85 inch . The assumption is also made that rain water con ns 1 m of nitrate as N. 2937 Veneman Ave.,11B240 Geo-Phase Environmental lac. Phone: (209)569-0293 Modesto,CA 95356 Fax: (209)569-0295 J