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> n <br /> GEOTECHNICAL <br /> NEIL 4. ANDERSON ENVIRONMENTAL <br /> A N D A S S O C I A T E S <br /> INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> i <br /> POST TENSION DESIGN <br /> October 29, 2007 <br /> NOA Job No: E07146A <br /> f <br /> Ms. Lisa Medina <� <br /> Environmental Health Department '��iTs��,Ty� �� <br /> 600 E Main Street <br /> Stockton, CA 95202 ICFs ly <br /> it Subject: UPDATE LETTER FOR SOIL SUITABILITY/NITRATE <br /> LOADING STUDY (SSS/NLS) { <br /> Macchia Winery <br /> 7099 E. Peltier Road <br /> Acampo, California <br /> Dear Ms. Medina, <br /> This update letter was drafted in an effort to clarify the clerical errors found in our <br /> firm's original SSS/NLS, dated September 30, 2007. As noted by you, an error was <br /> discovered on page 3, within the last paragraph of section 4.2 Contribution of Rainfall. <br /> The appropriate corrections have been made to both the report text and any <br /> subsequent calculations. Below you will find the corrected section and attached are <br /> copies of the corrected calculation worksheets (an annual precipitation worksheet, Plate <br /> 9 and a nitrate loading calculation worksheet, Plate 10). ; <br /> 4.2 Contribution of Rainfall <br /> An estimate of the quantity and quality of rainfall was required for the nitrate loading <br /> analysis The estimate of deep percolation of rain is based on the average monthly <br /> precipitation of rainfall and evapotranspiration for Lodi, California. An estimate of <br /> potential deep percolation of rain water recharge into the ground is required for the <br /> nitrate loading calculation. <br /> Since the site had rapid percolation rates, we will make the assumption that nearly all <br /> rainfall will infiltrate the ground fairly rapidly. Therefore, we estimate that roughly 80 <br /> percent of the rain fall will enter the ground water as recharge. The 20 percent <br /> reduction is to allow for some evaporation and transpiration of plants Runoff is not I <br /> expected. This method is not appropriate for sites which have relatively low infiltration <br /> rates <br /> ANGELS CAMP LODI . • MODESTO RENO SACRAMENTO WALNUT CREEK <br /> L 0 D 1 902 Industrial Way • Lodi,CA 95240 • 209.367.3701 • FAX 209-369.4228 • www.noanderson.com <br />