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Geosyntec Consultants <br /> Table 1:Historical Investigation Activities <br /> Rough and Ready Island,Site 47 <br /> Port of Stockton <br /> Investigation Report Media/Source Number of Samples Analyses Performed <br /> Soil samples collected to support <br /> limited treatability stud <br /> Total metals,DIWET metals,and PAHs <br /> Draft Remedial Investigation,Feasibility analyses re-treatment <br /> Study,and Remedial Action Plan for Soil,0-3 n bgs,pre-and post- 5 samples from 5 locations Modified and traditional DIWET metals <br /> Three Soil Sites(ERS,2011) treatment with 7/o cement analyses(post-treatment) <br /> XRF meter used to field screen samples, <br /> but XRF data were not reported <br /> Soil,0.5,1.5-2,2.5-3,3.5-4 feet 4 samples from each of 10 <br /> Arsenic <br /> Draft Site 47 Soil Sampling Report bgs borings <br /> (ERS,2015a) <br /> Groundwater,10-12 feet bgs I sample x 3 wells Dissolved arsenic <br /> Limited Environmental Investigation 2 samples from each of 10 <br /> Report,Prospective Lease Portion of Site Soil,0.5-1.5 feet bgs,3 feet bgs SVOCs,pesticides,and metals <br /> 47(Haley&Aldrich,Inc.,2020) borings <br /> Draft Final Site 47 RI/FFS Soil,0-1,1.5-2 feet bgs 2 samples from each of 1 I Arsenic <br /> (Geosyntec,2022) borings <br /> Abbreviations: <br /> bgs=below ground surface SVOCs=semi-volatile organic compounds <br /> CPT=cone penetrometer test TPH=total petroleum hydrocarbons <br /> DTSC=Department of Toxic Substances Control TtEMI=Tetra Tech EM,Inc. <br /> ERS=Environmental Risk Services Corporation VOCs=volatile organic compounds <br /> PCBs=polychlorinated biphenyls WET=waste extraction test <br /> PRC=PRC Environmental Management,Inc. XRF=X-ray fluorescence <br /> RRI=Rough and Ready Island <br /> Notes: <br /> 1.Background soil concentration investigation(PRC,1997c)determined background concentrations reflective of conditions across RRI,not limited to <br /> Site 47.This evaluation was superseded by DTSC's March 2015 reanalysis of RRI background conditions(DTSC,2015). <br /> 2.Channel bank soil samples were collected from the drainage channel bank south of Site 47 in association with the Site 3 Remedial Investigation <br /> (TtEMI,1998). <br /> Page 2 of 2 <br />