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1'11? A CT t Location 917-03 Location 917-05 F Screen Interval(ft bgs) 4-14 Screening Screen Interval(ft bgs) 4-14 Screening ' Groundwater Elevation(ft msl) -7.08 Level Groundwater Elevation(ft msl) -7.18 Level Location 917-01 _ + Sample Date 9/16/2021 Sample Date 9/16/2021 Screen Interval(ft bgs) 4-14 Screeningt F ° TPH(C28-C40) <160 TPH(C28-C40) <160 t Groundwater Elevation(ft msl) -7.31 Level +� h ., GRO(C4-C12) 780 760 GRO(C4-C12) 370 760 Sample Date 9/16/2021 DRO(C10-C28) 6201 200 _DRO(C10-C28) 120J 200 TPH(C28-C40) <160/<160 Benzene 4.8 1.0 Benzene <0.08 1.0 GRO(C6-C12) 18J/2301 760 Ethylbenzene 1.2 30 Ethylbenzene <0.084 30 DRO(C10-C28) 1101/110/ 200 Toluene 0.87 40 Toluene <0.095 40 Location 917-11 Benzene <0.08/<0.08 1.0 m,p-Xylene 0.66 -- m,p-Xylene <0.27 -- Screen Interval(ft bgs) 4-14 Ethylbenzene <0.084/<0.084 30 o-Xylene 0.2 J o-Xylene <0.14 Groundwater Elevation(ft msl) -7.30 Toluene <0.095/<0.095 40 Naphthalene <0.48 0.17 1 Naphthalene <0.48 0.17 Gauge Date 9/13/2021 m,p-Xylene <0.27/<0.27 o-Xylene <0.14/<0.14 917-01 917-05 917 11 Naphthalene <0.48/<0.48 0.17 nl Location 917-10 Location 917-04 Screen Interval(ft bgs) 4-14 Screening r, ■ Screen Interval(ft bgs) 4-14 Screening Level �. wr* Groundwater Elevation(ft msl) -7.16 T' Groundwater Elevation(ft msl) 7.09 Level SS-8117B-06A Sample Date 9/16/2021 Sample Date 9/16/2021 917-03 TPH(C28-C40) <160 r. TPH(C28-C40) <160 GRO(C6-C12) 3,600/3,400 760 r GRO(C4-C12) 750 760 917-10 - _ SS-8176-07A DRO(C10-C28) 1,100 J/9401 200 • '_ _ !. DRO(C10-C28) 8401 200 � � �• Benzene 18/18 1.0 Benzene 0.82 1.0 ,. '„• �� •,j 4 917-04 Ethylbenzene 1.9/1.9 30 �'i � �" •�4 , --i Ethylbenzene 0.261 30 Toluene 7.6/7.6 40 �(, , _ Toluene 0.131 40 '•��.- r, m, m,p-Xylene 1.5/1.5 pX ylene <0•27 o-Xylene 10/9.7 _ } '•;� ta- o-Xylene 0.141 fr{ Naphthalene <0.48 0.17 _ 1r.. "^7�'1 Naphthalene <0.48 r •- ' r Location 917 Now '• -06 ' ''_�• ',r r Z �917-12 ,• Screenlnterval(ftbgs) 4-14 Screening t" ��r jt ' �• Groundwater Elevation(ft msl) -7.01 Level Sample Date 9/16/2021 - --- .A- 917-06 �. T:_ TPH(C28 C40) 917-02 <160 ' •� ti GRO(C <15 760 EIRPOVI DRO(C10-C28) <48 200 Benzene <0.08 1.0 r Ethylbenzene <0.084 30 i Toluene <0.095 40 . m,p-Xylene <0.27 • r - o-Xylene <0.14 Naphthalene <0.48 Legend Notes: All data posted are from the 2021 Rough and Ready Island Annual UST 817B Shallow Groundwater Monitoring <=compound is below method detection limit Groundwater Monitoringevent. Proposed Soil and Grab Roads ft bgs=feet below ground surface Detections are displayed in bold font. Well Locations and Analytical Data (2021) - Groundwater Sampling Location O Former Building Structures ft msl=feet above mean sea level -All results are posted in micrograms per liter(pg/L). DRO= Diesel range organics N Port of Stockton, Rough&Ready Island Existing Monitoring Well Location Yellow highlighted results exceed the San Francisco Regional Water Quality 9 9 �Former UST GRO=Gas Range Organics Control Board Enviornmental Screening Levels for MCL Priority(Table GW-1) Stockton,California (sampledau TPH=Total petroleum hydrocarbons and gauged ed annual)y) Former Excavation Area (2019,rev.2).Where both cancer risk and non-cancer hazard exposure levels hp ® UST=Underground Storage Tank were available,the more stringent level was selected. G2OSytlt�C 9 Existing Monitoring Well Location J=Result is less than the reporting limit but greater -Blue highlighted results are non-detects where the detection limit exceeds the Figure (only gauged annually) Approximate Groundwater than or equal to the method detection limit and screening level. Flow Direction the concentration is an approximate value. -Aerial image source:Google Earth Pro,August 2019 consultants Existing Monitoring Well Location o eo 4 (unable to locate) Feet WR2501B March 2022 \\oakland-01\data\GIS\Port_Of_Stockton\Rough-and-Ready-Island-PM\Project\USTs\2022-02_Building817B\Fig04_ShallowGW.mxd 3/3/2022 11:20:51 AM(Author:KWalton)