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PRE-TANK REPLACEMENT Site Assessment Work Plan <br />4315 Waterloo Road Stockton, CA. <br />Aegis Project No. 89-047 <br />Page i <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION 1 <br />1.1 Purpose 1 <br />1.2 Scope 1 <br />2.0 BACKGROUND INFORMATION 3 <br />2.1 Site Location 3 <br />2.2 Site Description -) , <br />2.3 Adjacent Land Uses 3 <br />2.4 Tank Storage Products 6 <br />2.5 Spill, Leak and Accident History 7 2.6 Utilities 7 <br />2.6.1 On-Site Underground Utilities 7 <br />2.6.2 Off-Site Utilities 7 <br />2.7 Site Subsurface Conditions 7 <br />2.8 Site Hydrology 0 <br />2.9 Regional Geology 8 <br />2.9.1 Mehrten Formation 8 <br />2.9.2 Laguna Formation 9 <br />2.9.3 Victor Formation/Recent Alluvium 9 <br />2.9.4 Structure 9 <br />2.10 Regional Hydrogeology 9 <br />2.11 Water Well Information 10 <br />3.0 PROPOSED WORK PLAN 10 <br />4.0 METHODS 11 <br />4.1 Soil Sampling 11 <br />4.2 Soil Classification 11 <br />4.3 Soil Sample Screening: Portable Photoionization Detector <br />Method 12 <br />4.4 Analytical Procedures 12 <br />4.5 Quality Assurance Plan 12 <br />4.5.1 General Sample Collection and Handling <br />Procedures 12 <br />4.5.2 Sample Identification and Chain-of-Custody <br />Procedures 12 <br />4.5.3 Analytical Quality Assurance 13 <br />4.5.4 Miscellaneous Checks of Accuracy 13 <br />5.0 SCHEDULE 13 <br />6.0 REMARKS/SIGNATURES 14 <br />7.0 REFERENCES 15