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SOIL SUITABILITY STUDY/NITRATE LOADING STUDY <br /> 21300 MANN ROAD <br /> TABLE OF CONTENTS <br /> 1.0 INTRODUCTION.......................................................................................................................................................1 <br /> 1.1 Description of Site............................................................................................... 2 <br /> 1.2 Proposed Development....................................................................................... 2 <br /> 2.0 PAST,PRESENT AND PROPOSED FUTURE USES....................................................................................2 <br /> 3.0 GEOLOGIC AND SOIL PROFILE INFORMATION.......................................................................................3 <br /> 3.1 Chemical and Physical Soil Properties.................................................................. 3 <br /> 3.2 Mass Transport Soil Properties ........................................................................... 3 <br /> 4.0 GROUNDWATER INFORMATION....................................................................................................................4 <br /> 4.1 Groundwater Depth and Gradient........................................................................ 4 <br /> 4.2 Potential Groundwater Contamination Issues ...................................................... 4 <br /> 4.3 Water Sample Locations and Constituents............................................................ 4 <br /> 4.4 Current and Future On-Site Groundwater Uses..................................................... 4 <br /> 5.0 SOURCES AND IMPACT OF NITRATE TO GROUNDWATER...............................................................5 <br /> 5.1 Current Off-Site Sources of Nitrate....................................................................... 5 <br /> 5.2 Contribution of Rainfall....................................................................................... 5 <br /> 5.3 Current On-Site Sources of Nitrate....................................................................... 5 <br /> 5.4 Future On-Site Sources of Nitrate......................................................................... 5 <br /> 5.4.1 Quantity and Quality of Domestic Wastewater from Proposed Project.............. 5 <br /> 5.4.2 Denitrification Estimate................................................................................. 6 <br /> 5.5 Nitrate Loading................................................................................................... 7 <br /> 5.6 Impact of Nitrate Loading to Nearby Water Sources.............................................. 7 <br /> 6.0 DISCUSSION OF NITRATE LOADING RESULTS........................................................................................7 <br /> 6.1 Total Nitrate Impact............................................................................................ 7 <br /> 6.2 Nitrate Loading-Methods of Mitigation ............................................................... 7 <br /> 7.0 EXISTING AND PROPOSED SEPTIC TANK USAGE..................................................................................8 <br /> 7.1 Existing On-Site Septic Tank Usage,Permits and Repair History............................ 8 <br /> 7.2 Expected Maximum Septic Tank Usage for Site..................................................... 8 <br /> 7.3 General Area Septic Tank Usage,Permit,and Repair History................................. 8 <br /> 8.0 PERCOLATION TEST INFORMATION.........................................................................................................10 <br /> 8.1 Soil Boring Logs...................................................................................................10 <br /> 8.2 Percolation Test Procedure...................................................................................11 <br /> 8.3 Percolation Test Form and Results.........................................................................11 <br /> 9.0 SOIL SUITABILITY STUDY CONCLUSIONS..............................................................................................11 <br /> Petralogix Engineering,Inc. <br /> 26675 Bruella Road,Galt,Ca 95632 <br /> (209)-400-5729 <br /> www.petralogix.com <br />