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TABLE 1BCOMPARISON OF ANALYTICAL RESULTS OF SOIL SAMPLES: CAPPED LANDFILL AREA VERSUS WASTE CELLS FORMER PILKINGTON NORTH AMERICA – LATHROP FACILITYLATHROP, CALIFORNIACapped Landfill AreaWaste Cells Concentration Range Concentration RangeDTSC-SL RSL ESLBorings and Trenches004.32.0ND - 4.3ND - 2.0Stockpile/Waste Samples0.51.53.16.10.50 - 3.11.5 - 6.1Verification Samples004.32.8ND - 4.3ND - 2.8Borings and Trenches0.002.6159.4ND - 152.6 - 9.4Stockpile/Waste Samples5.56.21321.45.5 - 136.2 - 21.4Verification Samples3.76.57.7513.7 - 7.76.5 - 51Borings and Trenches00.008.21.3ND - 8.2ND - 1.3Stockpile/Waste Samples1.7141502261.7 - 15014 - 226Verification Samples01.51270ND - 121.5 - 70Borings and Trenches0000NDNDStockpile/Waste Samples00.240.7122.2XXND - 0.71 0.24 - 22.2Verification Samples-- -- - -Borings and Trenches0000NDNDStockpile/Waste Samples0-1.1-ND - 1.1-Verification Samples0000NDNDBorings and Trenches0000NDNDStockpile/Waste Samples0- 0- ND -Verification Samples0000NDNDBorings and Trenches0000NDNDStockpile/Waste Samples0---ND-Verification Samples00.0950.110.2ND - 0.110.095 - 0.20Borings and Trenches0000NDNDStockpile/Waste Samples003,20042ND-1.5 / 50-1,900/ 100-3,200 ND / ND-36 / ND-42Verification Samples002,100150ND / ND-950 / ND-2,100 ND / ND-33 / ND-150Borings and Trenches000.00710ND - 0.0071NDStockpile/Waste Samples0.42-6.4975.48XX0.42 - 6.4975.458 (Sample 703)*Verification Samples0.0052901.054.840.00529 - 1.05ND - 4.84Notes:mg/kg: milligrams per kilogrampg/g: picograms per gram(Sample 703)*: sample 703 was collected by Regional Board Staff in October 2015 from the south waste cellBelow Environmental Screening Levels/Hazardous Waste Limit--not analyzedAbove Environmental Screening Levels/Hazardous Waste LimitND: Non-DetectEPA-RSL US EPA Region 9 - Regional Sreening Levels for industrial soil November 2018DTSC-SL Department Toxic Substace Control (DTSC) HERO Note 3- Sreening Levels for commercial/industrial soil April 2019ESL San Francisco Bay RWQCB Environmental Screening Levels-for commerical/industrial shallow soil exposure Jan. 2019SVOCs: semi-volatile organic compoundsPAHs: polycyclic aromatic hydrocarbons XX: Out of a total of 230 soil samples collected from the landfill area and the waste cells, only 1 soil sample exceeded an PCBs: polychlorinated biphenylsSTLC: soluble threshold limit concentrationsenvironmental screening level and only 1 sample exceeded the hazardous waste limit. Both samples were collected from the VOCs: volatile organic compoundsWaste Cells: Waste Cell Sample 703 moderately exceeded the environmental screening level for dioxin/furan; TPH-g/d/o: total petroleum hydrocarbons quantified as gasoline/diesel/oiland Waste Cell Sample EXSP-5 moderately exceeded the hazardous waste limit for lead (Pb) by STLC analysis.Capped Landfill Area No. of Samples: Trench/boring Samples= 41; SP/Waste Samples=75; Verification Samples= 70Waste Cells No. of Samples: Trench/boring Samples= 7; SP/Waste Samples=9; Verification Samples= 28PCBs (mg/kg)TPH-g/d/o (mg/kg)Dioxin/Furan (pg/g)Chromium (mg/kg)Lead (mg/kg)Lead (STLC) mg/lSVOCs (mg/kg)PAHs (mg/kg)Sample LocationsAnalyteEnvironmental Screening Levels (Commercial/Industrial)Arsenic (mg/kg)Minimums Capped Landfill Area Minimums Waste Cells Maximums Capped Landfill AreaMaximums Waste Cells Primary MCL= 0.015 California Hazardous Waste Limit=5.0VariableVariable0.36 0.31170,000 1,800,000800 3803.01,800,0003200.58 0.9422 220.9722ESL TPH-g = 2,000 ESL TPH-o= 180,000 DTSC-SL TPH-d= 2,500