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Soil Suitability and Nitrate Loading Study DEWALT PROPERTY 4504 Virgil Street, Stockton, California 95215 TABLE OF CONTENTS SECTION PAGE 1.0. INTRODUCTION AND PROPOSED DEVELOPMENT.........................................1 1.1. DESCRIPTION OF SITE.................................................................................... 1 1.2. DESCRIPTION OF PROPOSED DEVELOPMENT ........................................... 1 1.3. PARCEL VICINITY LOCATION MAP................................................................. 2 1.4. SITE MAP.......................................................................................................... 2 2.0. PRESENT AND PAST USAGE OF SITE.............................................................. 2 2.1 POTENTIAL SITE PROBLEM ASSESSMENT .................................................. 2 3.0. EXISTING AND PROPOSED SEPTIC TANK USAGE.........................................2 3.1. EXISTING ON-SITE SEPTIC TANK USAGE ..................................................... 3 3.2. SITE SEPTIC PERMIT HISTORY......................................................................3 3.3. ON-SITE SEPTIC TANK REPAIR HISTORY.....................................................3 3.4. EXISTING SEPTIC TANK USAGE IN THE GENERAL AREA ........................... 3 3.5. GENERAL AREA SEPTIC PERMIT HISTORY..................................................3 3.6. PROPOSED MAXIMUM SEPTIC TANK USAGE ON SITE...............................4 4.0. GROUNDWATER INFORMATION - REGIONAL HYDROGEOLOGY.................4 4.1. GROUNDWATER DESCRIPTION FOR THE GENERAL AREA ....................... 5 4.2. GROUNDWATER CONTAMINATION IN THE AREA OF THE SITE ................. 5 4.3. ON-SITE EXISTING WELL DESCRIPTION.......................................................5 5.0. SOIL PROFILE..................................................................................................... 5 5.1. SOIL PROFILE PIT INCLUDING DEPTH AND DIMENSIONS .......................... 6 5.2. SOIL LITHOLOGY AS RELATED TO FUTURE ONSITE SEPTIC USES .......... 6 6.0. PERCOLATION TEST INFORMATION................................................................ 6 6.1. NUMBER OF PERCOLATION TESTS PERFORMED ....................................... 6 6.2. CONSTRUCTION OF PERCOLATION TEST HOLE ......................................... 7 6.3. DESCRIPTION OF THE PERCOLATION TEST HOLE - POST SOAK ............. 7 6.4. PERCOLATION TEST CONFORMED TO SJC POLICY EHD 98-02 ................ 7 6.5. COMPLETED PERCOLATION TEST FORM.....................................................7 6.6. POTENTIAL PROBLEMS PREDICTED............................................................. 8 6.7. PERCOLATION TEST FINDINGS..................................................................... 8 7.0. CHEMICAL AND PHYSICAL PROPERTIES OF SOIL ........................................ 8 7.1. CHEMICAL AND PHYSICAL PROPERTIES OF SITE SOILS ........................... 8 7.2. MASS TRANSPORT PROPERTIES OF UNDERLYING SITE SOILS...............8 8.0. GROUNDWATER ANALYSIS.............................................................................. 9 8.1. DESCRIPTION OF LOCAL GROUNDWATER .................................................. 9 8.2. EXISTING OR POTENTIAL GROUNDWATER CONTAMINATION .................. 9 8.3. CURRENT AND FUTURE USE OF GROUNDWATER AT THE SITE ............... 9 9.0. IMPACT OF NITRATE TO GROUNDWATER...................................................... 9 9.1. CURRENT OFF-SITE SOURCES OF NITRATE ............................................... 9 9.2. IMPACT OF RAINFALL CONTRIBUTION TO NITRATE LOAD ...................... 10