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Technical Memorandum — Additional Subsurface Investigation Work Plan, September 11, 2018 705 Carlton Avenue, Stockton, California EFI Global Project Number 9836003958 number, sample depth, sam pie identification number, requested analysis, sampler's initials, and date and time of collection. Following collection and labeling, samples will i mmediately be placed in a sam pie cooler for temporary storage. The following protocol will be followed for sample packaging: Sample containers will be placed in cl ear, plastic, leak-resistant bags prior to placement in an appropriately cooled, thermally insulated container. Ice will be pl aced in leak- resistant plastic bags and included in the coolers to keep sam pies at a chilled temperature during transport to the analytical laboratory. If a drain plug is present in the cooler, it will be secured with fiberglass tape to prevent melting ice from leaking. All collected samples will be shipped to a state-certified laboratory under proper chain-of-custody control procedures. The chain-of-custody form will be placed in a wa ter-resistant plastic bag and taped on the insi de of the lid of the cooler. If groundwater is encount ered attempts will be m ade to collect one groundwater sam ple from six of the soil borings via temporary well screen, Hydropunch® sampler, or comparable technology. Groundwater will be transferred to laboratory provided glass c ontainers with preservative carefully to m inimize headspace. Each groundwater sample will be analyzed for VOCs by EPA Method 8260B. DISPOSAL OF INVESTIGATION-DERIVED WASTE Soil cuttings will be placed in Department of Transportation (DOT)-approved 55-gallon drums and stored at the site pending waste profiling and subsequent transport to an appropriately licensed disposal facility. The drums will be identified with labe ls including the name of waste gene rator, type of waste (soil), and accumulation date. IN DOCUMENTATION This section describes documentation that will be generated during the investigation. FIELD REPORT The field report will document where, when, how, and from whom any vital project infor mation was obtained. Report entries will be co mplete and suffi ciently accurate to permit reconstru ction of field activities. Each page of the report will be dated and the time of entry noted in military time. All entries will be legible, written in ink, and signed by the individual making the entries. Language will be factual, objective and free of perso nal opinions or other terminology that might prove inappropriate. Errors will be corrected by crossing a line through the error, providing the correct info rmation, and dating and initialing the correct information. No entries will be obliterated or rendered unreadable. CHAIN OF CUSTODY DOCUMENTATION Chain-of-Custody documentation for all samples collected will be prepared in the field and maintained with the samples fro m collection time t hrough relinquis hment to the analy tical laboratory. The project number/name, consultant information, sampler name, sample number/designation, sample depth, date and time of collection, sample matrix, sample containers (number and type), requested analysis and signatures of all parties retaining and/or relinquishing possession of the samples (including date and time of transfer) will be included in the documentation. REPORT PREPARATION A Phase II ESA Report will be co mpleted and available upon request to the SJCEHD for review within two weeks from receipt of all final analytical da ta. The report form at will follow standard site EFI Global Page 3 of 5 Engineering File& Environmental Services