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SAP/QAPP Addendum <br /> Lodi-125 N Stockton <br /> Final <br /> March 24,2025 <br /> SITE-SPECIFIC QAPP WORKSHEET #10 (CONTINUED) <br /> PROBLEM DEFINITION <br /> this survey. <br /> • Historical MGP soil sampling: Soil boring samples will be analyzed by GEL Laboratories,Inc. for: <br /> - Arsenic and lead (EPA Method 6010); <br /> - Total petroleum hydrocarbons (TPH) (EPA Method 8015M TPH total petroleum hydrocarbons as <br /> gasoline [TPH-g],total petroleum hydrocarbons as diesel [TPH-d],and total petroleum hydrocarbons <br /> as motor oil [TPH-mo]);and <br /> - PAHs (EPA Method 8270-SIM). <br /> • Historical UST soil sampling: Soil boring samples will be analyzed by GEL Laboratories,Inc. for: <br /> - Arsenic and lead (EPA Method 6010);and <br /> - Total petroleum hydrocarbons (TPH) (EPA Method 8015M TPH total petroleum hydrocarbons as <br /> gasoline [TPH-g],total petroleum hydrocarbons as diesel [TPH-d],and total petroleum hydrocarbons <br /> as motor oil [TPH-mo]). <br /> • Soil-gas sampling: Soil gas samples will be analyzed at Eurofins Air Toxics for: <br /> - Volatile organic compounds (VOCs) via EPA Method Toxic Organics (TO)-15 SIM,and helium as a <br /> tracer. <br /> • Indoor air sampling:Indoor air samples will be analyzed at Eurofins Air Toxics for: <br /> - VOCs via EPA Method TO-15 SIM. <br /> • Outdoor air sampling: Outdoor air sample will be analyzed at Eurofins Air Toxics for: <br /> - VOCs via EPA Method TO-15 SIM. <br /> Step 4—Define the Boundaries of the Study <br /> • Spatial boundaries: <br /> 17 <br />