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Nov 29 05 12:48p Peter Weiler (925) 938-1610 p.4 <br /> 1. INTRODUCTION <br /> Environmental Risk Services, Corporation (ERS) has prepared this Landfill Cell Investigation <br /> Work Plan (Work Plan) on behalf of the Port of Stockton (Port). This Work Plan was prepared <br /> based on a thorough review of existing data and pursuant to discussions with the Department <br /> of Toxic Substances Control - Sacramento (DTSC) and the Regional Water Quality Control <br /> Board-Central Valley Region (Regional Board) on October 13 and 14,2005. <br /> The purpose of the Work Plan is to: 1) complete the horizontal and vertical delineation of the <br /> landfill cells previously identified at the Installation Restoration (IR)sites IAS 11 & 12 and sites <br /> 37 & 38 (the subject sites); 2) assess the lateral and vertical extent of ground water impacts <br /> associated with the subject IR sites; and 3) characterize the source of the geomagnetic <br /> anomalies identified in previous investigations. <br /> 2. PROPOSED SCOPE OF WORK <br /> The following phases and associated tasks are proposed to complete the delineation of the <br /> landfill cell boundaries (horizontal and vertical), characterize potential impacts to ground <br /> water quality, and determine the source of the geomagnetic anomalies: <br /> ■ Task 1-Utility Location,Permitting, and Health&Safety Plan <br /> ■ Task 2-Trenching to Delineate Landfill Cells <br /> ■ Task 3-Trenching to Investigate Magnetic Anomalies <br /> ■ Task 4-Grab Ground Water Sampling <br /> ■ Task 5-Monitor Well Installation <br /> ■ Task 6-Ground Water Monitoring <br /> ■ Task 7-Report of Findings <br /> 2.1 TASK 1: PERMITTING, UTILITY CLEARANCE, HEALTH & SAFETY PLAN <br /> Trenching, drilling, and sampling activities are planned within the area containing landfill <br /> cells. Appropriate permits for these activities will be acquired from San Joaquin County and <br /> the City of Stockton. Underground Service Alert (USA) will be notified to clear the proposed <br /> trenching locations for underground utilities, and a private utility locator may be used to clear <br /> specific trenching locations. The proposed locations are contingent upon access Ernitations <br /> November 2005 Page 1 <br /> Environmental Risk Services,Corporation <br />