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Sod Snilabiliry&Nitric Uading Stcd) <br /> Vwpowd dome Winery. 17521 Deci,Rd.Lodi CA <br /> Project No, 670.1B <br /> July'22.201 Z <br /> srasm I(rnuent Nitrate <br /> Caratak=Rmdleac JJ ma it <br /> @m nl[rvces DJ m '1. <br /> Tas:inv Rim\'isrtors go m•'1. <br /> Nla:kefing Mrii Attendees go n, 'l. <br /> con nerei:el iii hw Nl m 'L <br /> Meteorie Water <br /> Rainwater percolating through the soil is the primas' leaching agent carrying nitrates to the <br /> groundwater The estimate of the amount of deep percolation is based, in part of the long- <br /> term average annual precipitation and on the average evapo-transpiration rate (ET) The rate <br /> at which precipitation exceeds evapo-transpiration is the rate at which percolating meteoric <br /> water is available to leach nitrates to groundwater According to the National Feather <br /> Service (htto 'cdo ncdc.ro�:i.eo\- . the mean annual rainfall at Lodi (the nearest reporting <br /> station) is 13.84 inches The rate of evapo-transpiration is available from the website of the <br /> California Irrigation Management Information System (CI MIS) <br /> (hap 'wwwcmus.water.ca _o.;cinus . The average annual evapo-transpiration rate for the <br /> Lodi station 12 is 50.3 inches. In recognition of the fact that most of the precipitation falls <br /> during the winter months, while most of the evapo-transpiration occurs during the summer <br /> the following table was prepared to provide a month-by-month breakdown. <br /> Month dean Piecip.(in.) Mean ET Percolation <br /> .Ian. 3.48 0-79 2.6g <br /> Feb. 4.39 1 5 1.'6 <br /> %lar. ?X- 3.-'8 <br /> Apr. 1.?(1 5.1' <br /> %lav 58 <br /> Jun. o 14 751 <br /> ,lul. n n 7.87 <br /> Aug _ fi; 6 85 _ <br /> Sep 31 5 11 <br /> Oct. 1.15 3.29 <br /> NON 2.36 1.54 4).82 <br /> Dec 3.34 a76 2.58 <br /> 7.& <br /> Based on these data, all of the percolation occurs between November and Februarv. and the <br /> total annual percolation rate is 7.85 inches The assumption is also made that rain water <br /> contains I mg1L of nitrate al. ti: <br /> 2937 venemae Awe..78244) Geo-Phase Environmental hie. W)9]'.ai <br /> Modnw,CA 95356 I-a' 2N) <br />