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Additional Site Investigation Work Plan Q� UPRR Bunkers—Tracy,CA } October 30, 2023 ~ • California Assessment Manual (CAM) 17 Metals by U.S. EPA Methods 6010B and 7471A(John P. Christopher 1997). 3.3 SURVEYING Upon completing the investigation,the latitude and longitude for each of the borings will be obtained by a surveyor.Coordinates for the subsurface features investigated will also be obtained.The survey data for the borings will be uploaded to the GeoTracker database. 3.4 INVESTIGATION-DERIVED WASTE Soil cuttings,decontamination water,and any purge water generated during the investigation will be placed in DOT-approved, open-top 55-gallon drums and stored onsite pending laboratory analysis,characterization,and transport to an appropriate disposal facility. To characterize the waste for disposal,Antea Group will collect at least one composite sample from the drum(s) of generated soil cuttings.A sample of the drummed decontamination and purge water generated will also be collected for analysis.The samples will be sealed in appropriate, laboratory provided containers, labeled,and packed on ice for transport to a California-certified laboratory following chain of custody procedures.The composite samples will be analyzed for the following: • Total petroleum hydrocarbons(TPH)carbon chain by U.S. EPA Method 8015B. • Polychlorinated biphenyls(PCBs) by U.S. EPA Method 8082. • CAM 17 Metals by U.S. EPA Methods 6010B and 7471A(soil only). • Full Scan VOCs by U.S. EPA Method 8260E with collection by U.S. EPA Method 5035. • Semi-volatile organic compounds(SVOCs) by U.S. EPA Method 8270 SIM. If the structure(s) have sediment or liquid inside,Antea Group will collect additional samples to characterize the material(s)for potential disposal.The volume of sediment inside the structures will be estimated in the field and one four-part composite sample will be collected for every 250 cubic yards.The composite sample will be comprised of sediment from four different locations in the structure and will include material from every five feet of depth.These samples will be prepared,submitted to a California-certified laboratory,and analyzed as described above. The results of the proposed investigation will be used to determine whether a structure can be closed in place or if it will need to be removed.To characterize the soil immediately surrounding the structures for potential disposal,Antea Group will collect one discrete sample for every 50 cubic yards of soil estimated for removal.The samples will be chosen from among the samples collected at four of the proposed exploratory borings and will include soil from every five feet of depth and the different lithologies observed.The chosen samples will be analyzed as described above in lieu of the analyses outlined in Section 3.2.4. To confirm soil slated for disposal does not classify as hazardous waste under Title 40 of the Code of Federal Regulations or the California Code of Regulations,Title 22,the results for the constituents listed in the regulations may undergo additional testing. If an analytical result exceeds the Total Threshold Limit Concentration (TTLC) regulatory level, it is automatically classified as California hazardous waste.The sample will still need to be analyzed by the Toxicity Characteristic Leaching Procedure(TCLP)to determine if it is Resource Conservation and Recovery Act(RCRA) hazardous waste. If a TTLC result is higher than 10 times the regulatory level for the Soluble Threshold Limit Concentration (STLC),the sample will be further analyzed using the STLC procedure. If a TTLC result is higher than 20 times the TCLP regulatory level,the sample will be further analyzed �INOGENIX ALLIANCE uS_atnteagroup.cam 4