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SAP/QAPP Addendum <br /> Lodi-125 N Stockton <br /> Final <br /> March 24,2025 <br /> feet bgs and from 14 to 15 feet bgs using TeflorJm tubing.The screen interval will consist of sand pack <br /> material.The Toeroek Team will then add a 1-foot interval of dry bentonite above the sand pack material and <br /> hydrated bentonite above the dry bentonite to the ground surface.The permanent soil gas wells will be <br /> allowed to equilibrate for at least 48 hours before sampling. Soil gas sampling will not occur within 24 hours <br /> after a precipitation event. <br /> Before sampling,a shut-in test and soil gas well purging will be performed on each temporary soil gas well. <br /> Soil gas samples will be collected into 1-liter SUMMA®canisters under a helium shroud to evaluate if ambient <br /> air was introduced into the sample canister during the sample collection. Following the 1-liter SUMMA® <br /> canister sample collection,a second sample will be drawn through a laboratory-provided sorbent tube using a <br /> syringe per laboratory instructions. <br /> Soil gas samples will be analyzed for VOCs (EPA Method TO-15) and helium (as a leak tracer gas) (ASTM <br /> D1946). <br /> All soil gas sample handling will accord with analytical laboratory requirements outlined in Site-Specific <br /> QAPP Worksheet#19. Samples will be collected,labeled,recorded,packed,and shipped per Toeroek Team <br /> SOP#021-1,Soil Gas Sampling;SOP #017-2,Recording of Notes in Field Logbook;and SOP #015-1, <br /> Packaging and Shipping Samples,and EPA Environmental Response Team SOP#1704,SUMMA®Canister <br /> Sampling,in Appendix C and per Site-Specific QAPP Worksheet#19. <br /> 6.7 Ambient Air Sampling <br /> Ambient air samples will be collected at the Site to evaluate whether hazardous vapors are accumulating <br /> inside the unoccupied office building.The indoor locations will be located in each of the building's rooms <br /> (Figure 4).The indoor and outdoor air samples will be analyzed for VOCs (EPA Method TO-15 SIM). <br /> All air sample handling will accord with analytical laboratory requirements outlined in Site-Specific QAPP <br /> Worksheet#19. Samples will be collected,labeled,recorded,packed,and shipped per Toeroek Team SOP <br /> #026-1,Indoor Air Sub-Slab Soil Gas Sampling Methods;SOP#017-2,Recording of Notes in Field <br /> Logbook;SOP#015-1,Packaging and Shipping Samples in Appendix C,and Site-Specific QAPP <br /> Worksheet#19. <br /> 54 <br />