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November 5, 2007 PART II: NITRATE LOADING STUDY NEW MOOSE LODGE 3824 EAST WOODBRIDGE ROAD ACAMPO, CALIFORNIA OUR PROJECT NUMBER: E07175A d INTRODUCTION Our office was contracted by Peter Friis of Friis Constructors, Inc. to conduct a Nitrate Loading Study (NLS) for the property at 3824 East Woodbridge Road, Acampo, California. Please refer to the relevant sections of the attached Soil Suitability Study (SSS) for introductory project details. To expedite San Joaquin County Environmental Health Department (EHD) review, the formatting of this report has been designed to follow, to the greatest degree possible, the structure of the EHD's Nitrate Loading Study Requirements Checklist, dated July 14, 2003. Because of concern regarding nitrate leaching into ground water from septic systems, a nitrate loading analysis was required by the EHD for the proposed development to measure the potential concentration of percolating effluent and rain fall over the long term. Where percolating effluent leaches into the ground, ground water quality may be impacted to some degree should the effluent reach ground water. The method utilized for the nitrate loading analysis is based on a simple mass balance formula, discussed in a published article by Hantzsche and Finnemore (1992), which provides a convenient and simplified method to estimate long-term ground-water nitrate impacts on an area-wide basis. Hantzsche and Finnemore found that over a long period of time, water quality in the upper saturated ground-water zone closely approximates the quality of percolating recharge waters. They believe that their method is a good planning tool and provides useful information to planners and local officials but with some real limitations. In their article published in Ground Water, Hantzsche and Finnemore mention that "...the equation ignores dispersion, lateral flow, and mixing with ground water flow from up-gradient areas. These processes would generally contribute to additional reduction of nitrate-nitrogen concentrations in ground water to the extent that the nitrate-nitrogen concentration of ground-water flow from up-gradient areas is lower." The Hantzsche and Fennemore approach is "...a conservative (worst case) first approximation of ground-water nitrate-nitrogen concentration resulting from the combined effect of on-site sewage disposal systems and precipitation. This (the equation and approach) is for estimation of long-term effect (i.e., over years) on ground-water quality, and is not intended for prediction of seasonal changes" (Hantzsche and Finnemore, 1992). ,.*44 902 Industrial Way•Lodi,CA 95240.209.367.3701 •Fax 209.369.4228 ©2007 Neil O.Anderson&Associates,Inc.