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GROUND WATER INVESTIGATION WORK PLAN <br />BULK TERMINALS SITE, PORT OF STOCKTON, STOCKTON, CALIFORNIA <br />Table of Contents <br />SECTION PAGE <br />INTRODUCTION 1 <br />BACKGROUND AND PREVIOUS INVESTIGATION 1 <br />2.1 Operation of The Bulk Terminals Site 1 <br />2.1.1 Historical Operations — Sulfur Prill 3 <br />2.1.2 Historical Operations — Coal and Petroleum Coke 3 <br />2.1.3 Historical Operations — Copper Concentrate 4 <br />2.2 Previous Soil And Groundwater Investigation 4 <br />2.2.1 Soil sampling results - 1991 4 <br />2.2.2 Ground water sampling results - 1991 5 <br />2.2.3 Ground water sampling results - 2003 5 <br />2.3 Geologic and Hydrogeologic Setting 6 <br />2.3.1 Regional Setting 6 <br />2.3.2 Local Geologic Setting 6 <br />2.3.3 Local Hydrogeologic Setting 6 <br />PROPOSED SCOPE OF WORK 7 <br />3.1 Phase 1: Hydrogeologic Characterization 8 <br />3.1.1 Task 1: Permitting, Utility Clearance, and Health & Safety Plan 8 <br />3.1.2 Task 2— Boring Advancement and Sample Collection 8 <br />3.1.3 Task 3 — Sample Analyses 13 <br />3.1.4 Task 4— Data Evaluation and Monitor Well Recommendations 15 <br />3.2 Phase 2 — Monitor Well Installation and Quarterly Ground Water Monitoring 15 <br />3.2.1 Task 5 — Utility Location, Permitting, and Health and Safety Plan 15 <br />3.2.2 Task 6 - Monitor Well Installation 15 <br />3.2.3 Task 7 — Quarterly Ground Water Monitoring 17 <br />3.2.4 Task 8 — Technical Report 17 <br />REFERENCES 19 <br />DISTRIBUTION LIST 20 <br />July 2005 Page ii Environmental Risk Services Corp.