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Waste Pit <br />Evaluate Extent <br />Previously <br />of Impacted Soil <br />Collect and TestConfirmation Soil Samples <br />(Section 2.2 of SMP) <br />Yes <br />Encountered <br />Figure 2-1 <br />Former Pilkington North America Site <br />Lathrop, CA <br />July 2019 <br />EKI B90047.00 <br />Decision Diagram for Previously Unknown Waste Pits <br />Notify RWQCB <br />Were Soil Screening <br />Levels Exceeded? <br />Unknown <br />(Section 2.2 of SMP) <br />Sample and Test Material <br />Excavate Soil as Needed to <br />Meet Soil Screening Levels or <br />Until Groundwater Encountered <br />Were Soil Screening <br />Levels Exceeded? <br />No <br />Yes <br />Collect Stockpile <br />Soil Samples <br />(1 sample per 250 cy) <br />(Section 6.5 of EMMP) <br />Test for Hazardous Waste <br />Criteria to Evaluate for <br />Potential Reuse <br />(Section 6.6 of EMMP) <br />Were Hazardous <br />Waste Critera <br />Exceeded? <br />Dispose at <br />Off-Site Permitted <br />Yes <br />Disposal Facility <br />No <br />Yes <br />Subsample Stockpile <br />to Define Hazardous Portion of Stockpile <br />Were Hazardous <br />Waste Critera <br />Exceeded? <br />YesNo <br />Submit Revised Plan to <br />Manage Waste On-Site <br />(No Clean Closure)Were Soil <br />Screening Levels <br />Exceeded? <br />NoWere DI WET <br />Results Greater <br />Than MCLs? <br />NoStockpiles Qualifies For <br />Potential On-site Reuse <br />(If Geotechnically Acceptable) <br />YesYes <br />Abbreviations: <br />cy = cubic yards <br />DI = distilled water <br />MCL = maximum contaminant level <br />SMP = Soil Management Plan (EKI, 2019) <br />WET = waste extraction test <br />References: <br />EKI, 2019. Soil Management Plan, Former Pilkington North <br />America Site, 500 East Louise Avenue, Lathrop, California, <br />dated July 2019. <br />1. <br />Brusca, 2018. Excavation and Material Management Plan, <br />Murphy Parkway Property, APN 198-012-009, 17100 Murphy <br />Parkway, Lathrop, San Joaquin County, California, dated 9 <br />March 2018. <br />2. <br />EMMP = Excavation and Material Management Plan (Brusca, 2018) <br />Extent of Impacted <br />Soil Can Be <br />Fully Excavated <br />Extent of Impacted <br />Soil Cannot Be <br />Fully Excavated <br />Due to Access <br />Limitations <br />Consult with <br />RWQCB to Leave <br />Impacted Soil <br />In Place <br />Does RWQCB <br />Approve to Leave <br />In Place? <br />Yes <br />Survey Location of <br />Impacted Soil ForYesDoes Site Owner <br />Choose to Leave <br />In Place? <br />Future Reference <br />During Construction in <br />Limited Access Area <br />No <br />RWQCB = Regional Water Quality Control Board <br />No <br />Continue <br />Construction <br />Activities