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Current Conditions Report <br />Former SAN JOAQUIN COGENERATION <br />17200 Murphy Parkway, Lathrop, San Joaquin County, California <br />(APN 198-120-05) <br /> <br />TABLE OF CONTENTS <br /> <br />SECTION PAGE <br /> <br />EXECUTIVE SUMMARY ................................................................................................. i <br />1.0. INTRODUCTION ................................................................................................... 1 <br />1.1. SITE CONTACT INFORMATION ....................................................................... 1 <br />1.2. CHEMICALS OF CONCERN ............................................................................. 2 <br />1.3. BRIEF SUMMARY OF PCB IMPACTS .............................................................. 2 <br />1.4. PROPOSED CLEANUP OPTIONS AND SCHEDULE ....................................... 2 <br />2.0. SITE DESCRIPTION AND BACKGROUND ......................................................... 3 <br />2.1. SITE LOCATION AND DESCRIPTION .............................................................. 3 <br />2.2. SITE BACKGROUND ........................................................................................ 3 <br />2.3. SURROUNDING LAND USE ............................................................................. 4 <br />2.4. SITE USE ........................................................................................................... 5 <br />2.5. REGIONAL GEOLOGIC/HYDROGEOLOGIC CONDITIONS ............................ 5 <br />2.6. STORMWATER AND WEATHER ...................................................................... 6 <br />2.7. HISTORIC OPERATIONS AND PCB SOURCES .............................................. 6 <br />2.8. CURRENT SITE ENVIRONMENTAL CONDITIONS ......................................... 7 <br />2.8.1. Areas of Concern ......................................................................................... 8 <br />2.8.2. Figures and Tables ...................................................................................... 9 <br />2.8.3. Stratigraphy and Groundwater ................................................................... 10 <br />2.9. OTHER SITE CONDITIONS ............................................................................ 10 <br />3.0. PCB CLEANUP SITE .......................................................................................... 11 <br />4.0. PROPOSED RISK-BASED PCB CLEANUP LEVELS ....................................... 11 <br />5.0. CONCEPTUAL SITE MODEL AND DATA GAPS .............................................. 11 <br />5.1. LABORATORY ANALYSES ............................................................................. 12 <br />5.2. AOC1 - WASTE CELL DELINEATION ............................................................. 13 <br />5.3. AOC1 – SUMMARY OF RESULTS AND EXTENTS ........................................ 13 <br />5.3.1. PCB Results .............................................................................................. 13 <br />5.3.2. Dioxins and Lead Results .......................................................................... 14 <br />5.3.3. TPH Results .............................................................................................. 14 <br />5.3.4. Lateral and Vertical Extent of COC Contamination .................................... 15 <br />5.4. AOC2 - WASTE CELL DELINEATION ............................................................. 15 <br />5.5. AOC2 – SUMMARY OF RESULTS AND EXTENTS ........................................ 16 <br />5.5.1. PCB Results and Extents .......................................................................... 16 <br />5.5.2. Dioxins and Lead Results and Extents ...................................................... 17 <br />5.5.3. TPH Results .............................................................................................. 18 <br />5.6. CONCEPTUAL SITE MODEL DISCUSSION ................................................... 20 <br />5.7. DATA GAPS AND ADDITIONAL SAMPLING .................................................. 22 <br />6.0. LIMITATIONS ..................................................................................................... 23