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CONTENTS <br /> i . INTRODUCTION <br /> 1 . 1 Scope 1 <br /> 1 .2 Response to Comments 1 <br /> 2 <br /> 1 .2. 1 Concerns of the San Joaquin County <br /> Public Health <br /> Service <br /> 1 '2.2 ConcernsExpressedb <br /> 2 <br /> Water Quality Control Boardegiorzl <br /> Central Valley Region <br /> 1 .3 Pro 9 <br /> posed Work . <br /> 2• SUMMARY OF PREVIOUS REPORTS 11 <br /> 14 <br /> 2. 1 Location and <br /> 2.z Sits Setting <br /> r Local Hydrogeolo 14 <br /> gY and Gxvundwater Use 15 <br /> ( 2.2. 1 Regional Hydrogeology <br /> 2.2.2 Site Hydrogeolo 15 <br /> 1 2.2.3 Nearby Mater Supply 16` <br /> i 17 <br /> f . <br /> 2.3 Site History <br /> .17 <br /> 3 PREVIOUS INVESTIGATIONS <br /> 3. 1 Underground Tank Removal and <br /> 3.2 Sampling lg <br /> 3.2 Drilling and Sampling <br /> 3.3, : Installation of Mon'ioringof 4wellsrings 19 <br /> . 3.4 Sampling and Analysis ot. Groundater 22 <br /> 3.5 Surve in and 22 <br /> y g Gauging Depth to Groundwater <br /> 3.6 . Soil Vapor Contaminant Assessment 24 <br /> 25 <br /> 4•. SUMMARY OF REVISED PAR � <br /> 26.: . <br /> 5. REFERENCES <br /> 27 <br /> -APPENDIX .A <br /> LETTERS FROM SJCEHD; <br /> APPENDIXRWQCB <br /> ,$: GAUGING GROUNDWATER PURGE AND SAMPLE FORMS . <br /> APPENDIX C: S.TTE PLANS SHOWING GROUNDWATER-GRADIENT <br /> CALCULATIONS-.i 988- — <br /> ApP£NDIX D� <br /> GEOLOGICALLOGS.'Op SOIL BORI <br /> ,,APPENDIX E: EVAX :TECF3NOI;OGIESNGS <br /> APPENDIX F: ,. SOIL VAPOR EXTRACTION <br /> LABORATORY ANALYSPROPOSAL <br /> ES <br /> f <br />