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TABLE 1 <br />Maximum Concentrations and Allowable Chemical Exposure Limits and Exposure Symptoms <br /> <br />PEL (a)STEL (b)TLV (c) <br />Soil <br />(mg/kg) <br />Groundwater <br />(ug/L)(ppmv)(ppmv)(ppmv) <br />Lathrop, California <br />Former Pilkington North America Site <br />ROUTE OF ENTRY TARGET ORGANSACUTE EXPOSURE SYMPTOMSCHEMICAL <br />Maximum Concentrations <br />Others <br />Hydrogen Sulfide ----10 5 1 Inhalation, contact Irritation of eyes, respiratory system, apnea, coma, <br />convulsions, conjunctivitis, eye pain, lacrimation, <br />intolerance to light, dizziness, headache, fatigue, <br />irritability, insomnia <br />Eyes, respiratory system, <br />central nervous system <br />Methane ----NL NL NL Inhalation, contact When present in high concentrations, acts primarily as an <br />asphyxiant, exposure symptoms likely include dizziness, <br />headache, and nausea. Unpleasant odor <br />No reported acute health hazards <br />or adverse health affects <br />Abbreviations: <br />-- = not analyzed <br />ACGIH = American Conference of Governmental Industrial Hygienists <br />Cal-OSHA = California Occupational Health and Safety Administration <br />mg/kg = milligrams per kilogram <br />mg/m3 = milligrams per cubic meter <br />NL = not listed <br />ppmv = parts per million by volume <br />Notes: <br />(a) PEL = Permissible Exposure Limit, Cal-OSHA; 8hr/day, 40 hr/week (Title 8 CCR Section 5155) <br />(b) STEL = Short Term Exposure Limit, Cal-OSHA or ACGIH; 15-minute period (ACGIH, 2017) <br />(c) TLV = Threshold Limit Value, ACGIH ; 8hr/day, 40 hr/week (ACGIH, 2017) <br />EKI B90047.00 Page 9 of 9 EKI Environment & Water, Inc. <br />May 2019