ARCHIVED REPORTS_2018 VERIFICATION RPT (DEC)

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AntimonySilverArsenicBariumBerylliumCadmiumChromiumCobaltCopperLeadMolybdenumNickelSeleniumThalliumVanadiumZincMercuryTABLE IV SUMMARY OF TOTAL METALS DATA STOCKPILED WASTE MATERIAL SAMPLES 48-ACRE MURPHY PARKWAY PROPERTY 17100 Murphy Parkway, Lathrop, San Joaquin County, California Brusca Reference No. 137-002 SAMPLE ID DATE SAMPLED TITLE 22 METALS EPA Method 6010B/200.7 SP3-1 4/12/18 ND ND ND 61 ND ND 5.8 4.5 4.5 ND ND 6.0 ND ND 17 30 ND SP3-2 4/12/18 ND ND ND 72 ND ND 5.6 4.7 8.0 ND ND 6.6 ND ND 17 33 ND SP3-3 4/12/18 ND ND ND 41 ND ND 4.4 3.5 5.0 20 ND 4.1 ND ND 10 24 ND SP3-4 4/12/18 ND ND ND 53 ND ND 5.1 4.4 4.3 ND ND 5.7 ND ND 15 26 ND SP3-5 4/12/18 ND ND ND 64 ND ND 4.9 4.2 5.2 ND ND 5.1 ND ND 15 29 ND SP3-6 4/12/18 ND ND ND 43 ND ND 5.1 3.8 4.4 14 ND 4.5 ND ND 11 23 ND SP3-7 4/12/18 ND ND ND 43 ND ND 4.6 3.8 3.3 10 ND 4.1 ND ND 11 25 ND SP3-8 4/12/18 ND ND ND 67 ND ND 5.7 4.9 4.6 17 ND 6.6 ND ND 17 26 ND SP3-9 4/12/18 ND ND ND 59 ND ND 5.9 5.6 4.8 ND ND 6.6 ND ND 18 29 ND SP3-10 4/12/18 ND ND ND 57 ND ND 5.7 4.9 4.6 ND ND 5.7 ND ND 14 28 ND SP3-11 4/12/18 ND ND ND 56 ND ND 5.0 4.4 4.0 ND ND 5.7 ND ND 15 28 ND SP3-12 4/12/18 ND ND ND 38 ND ND 3.8 3.9 7.6 38 ND 3.6 ND ND 8.3 22 ND SP4-1 4/12/18 ND ND ND 31 ND ND 3.5 3.2 7.0 25 ND 2.9 ND ND 7.8 21 ND SP5-1 4/13/18 ND ND ND 59 ND ND 8.6 4.3 4.4 ND ND 6.2 ND ND 20 33 ND SP5-2 4/13/18 ND ND ND 63 ND ND 6.4 5.3 4.9 ND ND 7.2 ND ND 20 30 ND SP5-3 4/13/18 ND ND ND 61 ND ND 7.0 4.5 8.6 ND ND 6.4 ND ND 18 30 ND SP5-4 4/13/18 ND ND ND 64 ND ND 6.7 4.9 5.2 ND ND 7.2 ND ND 20 31 ND 500 500 500 10,000 75 100 2,500 8,000 2,500 1,000 3,500 2,000 100 700 2,400 5,000 20 N/A 390 0.11 6 N/A 15 5.2 36,000 N/A N/A 80 N/A 490 N/A N/A 390 N/A 1.0 N/A 1,500 0.36 6 N/A 210 7.3 170,000 N/A N/A 320 N/A 3,100 N/A N/A 1,000 N/A 4.5 31 390 0.68 6 15,000 160 71 120,000 23 3,100 400 390 1,500 390 0.78 390 23,000 11 470 5,800 3.0 6 220,000 2,300 980 1,800,000 350 47,000 800 5,800 22,000 5,800 12 5,800 350,000 46 Notes: 6. Arsenic data for the project are compared to background concentraiton of 8.6 mg/kg rather than cited screening levels. 1. All concentrations expressed in milligrams per kilogram (mg/kg) 2. California Code of Regulations Title 22, Division 4.5 3. DTSC-Modified Screening Levels (DTSC-SLs); January 20184. USEPA Regional Screening Levels, TR=1E-06, HQ=1”; November 2017 DTSC SLs - residential3 USEPA RSLs - residential4 Hazardous Waste Criteria2 DTSC SLs - commercial3 USEPA RSLs - commercial4 SCREENING LEVELS 5. N/A = screening value not established Page 2 of 2