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- -' -' - ' <br /> ' Extended Site C6unzu",iz^livv.Rmo,t: ?500West Eleventh Street Tracy, CA, Page <br /> i <br /> Table of Contents <br /> WX <br /> - Professional Certifioatiouand Limitations.........................................................................iv <br /> 1.0 INTRODUCTION-.----------------.....-----------.-- l <br /> 71 ll B�� <br /> ' . Locatiou-------.---------------------...----- l <br /> ! � l.2 S�nC�odeS .------------ 1 <br /> /] ---------^'^-------------'' <br /> 2.0 BACKGROUND ----------------------------------..2 <br /> [J 3.0 REU�I�V�\I.(]F 7�J�IC� �]�Z) �]��JLl�Q}� 5 <br /> i^] ____________ ______.___.. <br /> 3.1 Removal ufTanks ------___________,_______________. 5 <br /> 32 Over-excavation ofDispenser Pit------------------------- 5 <br /> :1 3.3 B ofExcavations..................................................................................... 6 <br /> 3/4 Disposition of Affected Soil Removed from Excavations...................................... 6 <br /> �j 4J0 INITIAL SITE CHARACTERIZATION PROGRAM.............................................. 7 <br /> 5.0 EXTENSION OF SITE CHARACTERIZATION-----------------.. 9 <br /> 5.1 Site Plan--------------~-.--------- .................................. Q <br /> 5.2 Deteutb000f T]lilitieS----------------.------ l0 <br /> / 5.3 Loom�oouof/�dd�iooul Borings and Monitoring Wells ................ lO <br /> � | 5.3.1 Vnrtico]Extcmt - Affeotod Groundwaterin Pnnn <br /> Island Aroa------- ll <br /> 5.3.2 EaotomLbzd1 - Principal Plume ofAleoted Groundwater.......................... ]2 <br /> � 53.3 Down-gradient Extent- Principal Plume ofAffected Groundwater............ 12 <br /> 5.�.4 ot�z��az�� �onn:� of� ��o�� 14 <br /> ---_'-��-_- .~----� ^^ ---_---/ ----.-- <br /> 5.4 Summary of \A/n}ls--------------. 14 <br /> 5.5 Well and Soil ---------.-------------.-.. 16 <br /> 5.6 AnalysesofSoil S ------~----------------.----.. 17 <br /> � 5.7 DisposalofDzil] Cuttings -------------.-------.-------. 17 <br /> 5'8 Well -------------------.------------.. 18 <br /> iJ 5.9 Computationof Groundwater Elemo±i000--------------------.. 18 <br /> 5.10 Well ---.---------------~.-------------- lD <br /> 5.11 Groundwater Sampling Procedure............................................................... ...... 19 <br /> 5.12 Groundwater Sample Analyses----~-.------------------. lg <br /> 5.13 Disposal ofPurge Water.....................................................................................2O <br /> 5.14 Infozouetioo Reports to State Agencies...............................................................20 <br /> 5.14] Well ----.----------------. 2O <br /> 5.14.2 Electronic Reports to the SWBCB..............................................................20 <br /> 6.0 GEOLOGY AND HYDROGEOLOGY--------------..------.. 2l <br /> 6.1 Use of Groundwater in Neighborhood nfSite.................................................... 2l <br /> 6.2 Groundwater Gradient and Flow Direction........................................................... 22 <br /> [� 6.3 Hydrostratigraphy........................................... ..................................................... 26 <br /> 7.0 DISTRIBUTION OF HYDROCARBONS IN THE 8l]BSllRFACB-------. 28 <br /> 7.1 Areas where Shallow Soil iaAffected bv Hydrocarbons--------.----. 28 <br /> 7.2 Releases nfHydrocarbons from Underground Tanks on Nearby Sites ................ 28 <br /> �- <br /> �-i sic <br />