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GEOTECHNICAL NEIL O. ANDERSON ENVIRONMENTAL A N D A S S O C I A T E S INSPECTIONS a TESTING LABORATORY SERVICES POOL ENGINEERING POST TENSION DESIGN May 30, 2008 Our Project Number: LG080506 Joe Ratto River Ranch Investment Properties 2762 North Tracy Boulevard Tracy, CA 95376 Subject: Soil Suitability Study Ratto, Sarale and Del Carlo Property, APN: 191-150-03 11981 South Roberts Road Stockton, California Dear Joe Ratto: The following report presents the findings and conclusions of our Soil Suitability Study conducted at the subject site. The purpose of the report was to provide a Soil Suitability Study in accordance with San Joaquin County Development code, as indicated in our proposal dated March 25, 2008, and accepted on March 31, 2008. Findings for this project have been provided in the body of the report and are listed in the conclusions. We appreciate the opportunity to work with you on this project and look forward to providing our services in the future. Please contact us if you have any questions. Sincerely, NEIL O. ANDERSON&ASSOCIA TES, INC, Na cy Kra e B.A. David J. We ch. .S . Principal Geologist St ff Scienti CEG-2151, C�Ss1 L -1049 O l QQ DAVID J. WELCH 0� * NO.2151 CERTIFIED 1k ENGINEERING U GEOLOGIST �TFOF CALIF�`�` ANGELS CAMP LODI MODESTO RENO SACRAMENTO WALNUT CREEK SOIL SUITABILITY STUDY RATTO, SARALE AND DEL CARLO PROPERTY TABLE OF CONTENTS 1.0 INTRODUCTION AND PROPOSED DEVELOPMENT ...................................................... 1 1.1 Site Description............................................................................................. 1 1.2 Proposed Development.................................................................................. 1 1.3 Site Vicinity .................................................................................................. 2 1.4 Site Map.......................................................................................................2 2.0 PRESENT AND PAST USES OF THE SITE.................................................................... 2 2.1 Past and Present Site Use.............................................................................. 2 3.0 EXISTING AND PROPOSED SEPTIC TANK USAGE .......................................................2 3.1 Existing On-Site Septic Tank Usage ................................................................ 2 3.2 On-Site Septic Permit History.........................................................................2 3.3 On-Site Septic Repair Permit History...............................................................2 3.4 Existing Septic Tank Usage in the Vicinity........................................................2 3.5 Septic Permit History in the Vicinity ................................................................2 3.6 Septic Repair Permit History in the Vicinity......................................................3 3.7 Expected On-Site Maximum Septic Tank Usage ............................................... 3 4.0 GROUNDWATER INFORMATION ...............................................................................3 4.1 Groundwater Depth and Gradient...................................................................3 4.2 Potential Groundwater Contamination Issues...................................................3 4.3 Water Sample Location..................................................................................3 4.4 Water Sample Constituents............................................................................3 4.5 Well Water Sample Collection, Handling, and Transportation ............................4 4.6 Chain of Custody...........................................................................................4 5.0 SOIL PROFILE AND GEOLOGIC INFORMATION .......................................................... 5 5.5.1 Soil Boring Locations ..........................................................................6 5.5.2 Soil Boring Dimensions .......................................................................6 5.5.3 Soil Lithology Observed ......................................................................6 5.4 Discussion of Soil Lithology............................................................................ 6 6.0 PERCOLATION TEST INFORMATION .........................................................................6 6.1 Percolation Test Locations .............................................................................6 6.2 Number of Percolation Tests.......................................................................... 6 6.3 Boring Preparation and Presaturation..............................................................7 6.4 Condition of Borings After Presaturation..........................................................7 6.5 Percolation Test Procedure ............................................................................7 6.6 Percolation Test Forms and Results ................................................................7 6.7 Discussion of Percolation Test Results.............................................................8 6.8 Discussion of Septic System Sizing .................................................................8 7.0 CONCLUSIONS ........................................................................................................8 8.0 LIMITATIONS..........................................................................................................8 '-44 i 902 Industrial Wav•Lodi,CA 95240-209.367.3701 •Fax 209.369.4228 02008 Nei!O.Anderson&Associates. Inc