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Table 4 Tabulation of Soil Sample Analytical Laboratory Results <br /> and Re ulato A enc Threshold Concentrations in Soil <br /> Chemical Published Typical Maximum Site USEPA RWQCB Region CaIEPA Total Threshold Soluble Threshold <br /> Background Concentration for Regional San Francisco CHIISL Limit <br /> Concentration this Investigation Screening Environmental Concentration Concentration ConSTLC)1on • <br /> in Site Area (mg/kg) Level Screening Commercial/ (TTLC) <br /> (Bradford and (RSL) Level Industrial for Hazardous for Hazardous <br /> Commercial/ (ESL) (mg/kg) Waste Waste <br /> others,1996) (mg/kg) m <br /> (mg/kg) Industrial <br /> Commercial/ (4) ( (5)g) ((5)) <br /> (mg/kg) Industrial <br /> Jan 2015 Shallow Soil <br /> (2) (<3 m bgs) <br /> (mg/kg) <br /> Dec 2013 <br /> 3 <br /> 'fell-Uicsel Not Included <br /> X50 440 Ila NA NA NA <br /> 59.6 NA 58 10,000 2,500 5 <br /> Chromium,total 27 <br /> (Cr) <br /> Cobalt(Co) 10.2 10.2 350 10 <br /> 3,200 8,000 80 <br /> Lead(Pb) 22.7 <br /> 5.7 800 320 3,500 1,000 5.0 <br /> Nickel(Ni) 13 41.1 12,000 150 <br /> 16,000 2,000 20 <br /> Linc(Zn) <br /> 97 46.1 350.000 600 100.000 5,000 250 <br /> L Threshold conecno-ations based oa protcc en of human health and grormdwawr. <br /> 2. RSLs based on CommercialMdustnal Soil(USEPA,Region 9,banoary,2015) <br /> 3. ESLs based on shallow soils(G3 an bgs)Table A-2 and groundwater is a current or potential source of drinking water(RWQCB,Dec.2013) <br /> 4. CHHSL values based on California Environmental Protection Agency Use of California Human Health Screening Levels in Evaluation ofContaudvared <br /> Properties,2005. <br /> 5. TTLC and STLC values based on California Code of Regulations,Title 22,Chapter 11,Article 3 <br />