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Soil Suitability and Nitrate Loading Study MCDONALD ISLAND STATION 2121 Zuckerman Road, Stockton, California 95202 TABLE OF CONTENTS SECTION PAGE 9.0. IMPACT OF NITRATE TO GROUNDWATER .................................................... 10 9.1. CURRENT OFF-SITE SOURCES OF NITRATE ............................................. 10 9.2. IMPACT OF RAINFALL CONTRIBUTION TO NITRATE LOAD ...................... 10 9.3. CURRENT ON-SITE SOURCES OF NITRATE ............................................... 10 9.4. FUTURE ON-SITE SOURCES OF NITRATE .................................................. 10 9.5. DENITRIFICATIONS CAUSED BY SOILS ....................................................... 11 9.6. MASS BALANCE OF NITROGEN LOADING .................................................. 11 9.7. IMPACT OF NITROGEN LOADING FROM SITE PROJECT TO DOWNGRADIENT WATER SOURCES ........................................................... 12 10.0. TOTAL NITRATE IMPACT FROM PROPOSED PROJECT ............................... 13 11.0. MITIGATION METHODS PROPOSED ............................................................... 13 12.0. CONCLUSIONS AND RECOMMENDATIONS ................................................... 13 13.0. LIMITATIONS ..................................................................................................... 14 FIGURES Figure 1 – Location Map Figure 2 – Site Vicinity Figure 3 – Overall Site Plan Figure 4 – Topographic Survey Site Plan Figure 5 – Site Plan Figure 6 – Septic System Plan APPENDICES Appendix A – Parcel Vicinity Map/Air Photo and Information Appendix B – Onsite Well/Septic Permit Appendix C – Percolation Test Sheet/ Onsite Wastewater Treatment System Permit - Percolation Test Appendix D – CIMIS Rain Evapotranspiration Report 2014-2020