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Nitrate Loading Analysis BSK Job E21-002-01B 2482 Carpenter Road July 13, 2021 Stockton, California P a g e | iii TABLE OF CONTENTS 1. INTRODUCTION...................................................................................................................1 1.1 Site and Surrounding Area ..................................................................................................................... 1 1.2 Data Gaps .............................................................................................................................................. 2 2. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL .................................................................3 3. GROUNDWATER ANALYSIS .................................................................................................3 3.1 Description of Groundwater Based on Publicly Available Groundwater Data .......................................... 3 3.2 Groundwater Quality Data: .................................................................................................................... 4 3.3 Current Groundwater Use at the Site: .................................................................................................... 4 4. SOURCES AND CALCULATED IMPACT OF NITRATE TO GROUNDWATER .............................4 4.1 Current Off-Site Sources of Nitrate to Soil and Groundwater in General Up Gradient Area:..................... 4 4.2 Impact of Rainfall Contribution of Nitrate Load to Project Site: ............................................................... 4 4.3 Current On-Site Sources of Nitrate to Soil and Groundwater: ................................................................. 5 4.4 Proposed Future On-Site Sources of Nitrate to Soil and Groundwater: ................................................... 5 4.5 Mass Balance of Nitrogen Loading Using Hantzsche and Finnemore Calculation: .................................... 6 4.6 Impact of Nitrogen Loading from Site Project to Downgradient Wells, Rivers, etc.: ................................. 8 5. DISCUSSION OF NITRATE LOADING RESULTS RELATIVE TO PROPOSED METHOD OF WASTEWATER DISPOSAL ............................................................................................................8 5.1 Total Nitrate Impact from Proposed Project: .......................................................................................... 8 5.2 Proposed Mitigation Methods for Nitrate-Nitrogen to Soil and Groundwater: ........................................ 8 6. CONCLUSIONS AND RECOMMENDATIONS .........................................................................9 6.1 Conclusions and Recommendations: ...................................................................................................... 9 7. CLOSING ............................................................................................................................10 8. REFERENCES ......................................................................................................................10 TABLES Table 1: Input Values and Source of Average Nitrate-Nitrogen Concentration in Recharge Water FIGURES Figure 1A: Site Vicinity Map Figure 1B: Site Septic Map Figure 2: Ground Water Contour Map APPENDICES Appendix A: National Oceanic & Atmospheric Administration Climatic Data Appendix B: Site Construction Plans, AECOM Appendix C: Jacktone Clay Soil Description Appendix D: Water Quality Data from USGS Well - Site Number: 375545121141601 Site Name: 001N007E17N001M