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SAP/QAPP Addendum Lodi-125 N Stockton Final March 24,2025 the age and approximate square footages of the unoccupied office building,an estimated 10 suspected PCB caulk samples will be collected. Suspect PCB samples will be extracted via EPA Method 3540 and analyzed via EPA Method 8082. Sampling locations and sampling and analytical methods are conveyed in Site- Specific QAPP Worksheet#18. 6.5 Soil Sampling To assess whether contamination from previous MGP activities and a historical UST is present on the Site, soil samples will be collected as summarized in Table 5-1 and shown on Figure 3 and Figure 4. 6.5.1 Historical Manufactured Gas Plant Soil Sampling Seven discrete subsurface soil borings from biased locations will be advanced inside and adjacent to the approximate location of the historical MGP (Stantec,Inc. 2023) via a direct-push technology(DPT) drill rig to 5 feet bgs (Figure 3). Soil samples will be collected from 0.5 to 1 feet bgs,2 to 3 feet bgs,and 3 to 5 feet bgs from each location.Because these locations on the Site are paved with concrete,concrete coring may be required;the concrete and base rock presumed to be underneath will not be included in the first sample increment. Before soil boring advancement,a utility locator will be used to clear each of the seven soil boring locations for buried utility lines. Should utilities be identified in the proposed sample area,the impacted soil boring will be relocated such that a 5-foot buffer from the buried utility is maintained.In addition,soil borings will be advanced the first 5 feet bgs using a hand auger,further reducing the risk to damaging underground utilities. Soil samples will be analyzed for arsenic and lead via EPA Method 6010,TPH will be extracted via EPA Method 3541 and analyzed via EPA Method 8015M (TPH-g,TPH-d,and TPH-mo),and PAH will be extracted via EPA Method 3541 and analyzed via EPA Method 8270-SIM. To collect soil samples for TPH-g,the Toeroek Team will use a single-use Terra Core® sampler and place collected contents of the sampler into 40-milliliter vials,each with the appropriate preservative for the specified analysis. For all other sample collection,the Toeroek Team will collect each sample using single-use trowels and glass bottles.The soil samples will be placed into an appropriate sample container,appropriately packaged,and sent to the laboratory for analysis. All soil sample preservation will accord with analytical laboratory requirements outlined in Site-Specific QAPP Worksheet#19. Samples will be collected,labeled,recorded,packed,and shipped per Toeroek Team 52