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Vil <br /> B12 Q <br /> 917-11 <br /> <0.081 <0 148* �91 -05 O B35 <0.5 <br /> U' <br /> � 0B05 <br /> �■ - --- <br /> 632QBoll — — — - -IVIII <br /> s f �' w tF� <br /> 7 1' ■ •. r <br /> 19�11 111 � 1 air �r Illir y�Ii lIII� • <br /> •iurr .u.�y._.0�p �. <br /> 1 o 917-03 1 917-09* 1 <br /> __ : 1�<0.14 1 <br /> QB�4: • j SS-817`B-07A �� <0.28 —� 1 r$917-10 1 - - <br /> t r y >t 1 r <br /> ~ <br /> I <br /> &., , B390 OB15 1 B10 <br /> 0 <br /> B38b100 t �J <br /> y�- A 917-07* ' -$917-04 � I ' <br /> ', • B13Q B30 <0.55 1 <0.14 <br /> 134f <br /> .w.r,_. • 917-13* I <br /> - - ' 631 <br /> • t <br /> 10 <br /> 91a � 917-14* <br /> 0.5 <br /> r #. I <0.08�B36 <br /> a - • OB07 , �rlI <br /> �917-06 <br /> y r <br /> • 917-02 <0.14 <br /> 3.7 <br /> ■�_ —A <br /> OB37 <br /> .a <br /> Legend Notes: <br /> Abbreviations: Monitoring Well and Historical Shallow Grab <br /> well data. <br /> O Grab Groundwater Sample Location Benzene Concentration Contour(lag/L) Former UST Drainage Channel Contours are based on shallow groundwater <=the reported <br /> is not detected above <br /> -Concentrations are reported in micrograms per liter(pglL). Groundwater Samples—Benzene <br /> Groundwater Sample from Monitoring Inferred Benzene Concentration Former Building Structures —•— Fence Concentrations shown are from the most recent monitoring the reported concentration. <br /> p g � � � 9 9 *=Sample location not used in N UST 817B <br /> Well Contour /L well data as included in the 2023 Groundwater Monitoring generating contours. Port of Stockton,Rough&Read Island <br /> �N9 ) Former Excavation Area 9 9 9 Y <br /> Q Building 917 Outline Report(Geosyntec,2023)or the Groundwater Monitoring p9/L=microgram per liter Stockton,California <br /> Approximate Direction of Groundwater Flow Suspected Excavation Based on Annual Report for 2015(ERS,2016). UST=underground storage tank <br /> in Shallow Groundwater Based on Review of GOogle Earth Images Circa 2010 B##samples were collected in 1998-1999. <br /> samples were collected in 2008. <br /> Historical Groundwater Monitoring Reports 817-D sam p Geosyntec Figure <br /> Between 2007 and 2023 -SS-817B samples were collected in 2019. <br /> Historical boring location source:Anchor QEA,May 2018. consultants <br /> -Aerial imagery source:Nearmap,June 2024. <br /> o ao 4 <br /> Feet F WR2501 E November 2024 <br /> \\oakland-01\data\GIS\Port_Of Stockton\Rough-and-Ready-Island-PM\Project\USTs\2024-07_UST817B\Figures.aprx\Fig04_HistoricalGWSamples_Benzene 9/26/2024 11:47AM(kwalton) <br />