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PSI Project Number:0575-1504-R1 On Guggenheim—Stockton,CA August 16, 2019 Page 4 Once the soil sample for analyses is selected, it will be logged on a chain-of custody form, labeled, and placed into a chilled ice chest pending delivery to the analytical laboratory. The soil samples will be delivered to the laboratory within 48-hours of collection. All soil samples collected will be transported to a State of California certified lab, under strict COC protocol. All soil samples collected will be labeled in a clear and precise way for proper identification in the field and for tracking in the laboratory. The soil samples will be given unique and identifiable names. The soil sample designation will be the following: B (Boring), Location (Number), and Depth (i.e. soil sample collected from boring location 1 at 5-foot bgs would be 131-5). At a minimum, the sample labels will contain the following information: sample location, date and time of collection, and personnel collecting the samples. Soil lithology will be described by a PSI professional and recorded on a field boring log for each boring drilled. -The data recorded on the logs will be based on examination of soil samples retrieved and drilling conditions observed in the field. Boring logs will include information regarding the location of the boring,type of sampler used, and geologic descriptions of materials encountered. Soils will be classified in general accordance with the Unified Soil Classification System. Other information to be recorded on the logs will include indications of contamination and the occurrence of groundwater. Field screening of collected soil samples for organic vapors will be performed using a PID. PID measurements will be recorded on the boring logs. 3.3 DECONTAMINATION AND WASTE MANAGEMENT Decontamination procedures will be implemented to maintain sample integrity and to prevent cross- contamination between sampling locations. Equipment to be decontaminated includes stainless-steel sampling equipment, as well as soil boring drilling equipment. Drill stems for the direct push rig will be pressure washed between borings. In the process of collecting environmental samples at the site during the soil sampling activities, PSI will generate different types of potentially contaminated investigation-derived wastes (IDW) that include the following: • Used personal protective equipment (PPE) • Disposable sampling equipment • Soil Cuttings • Water from decontamination procedures Used PPE and disposable equipment will be bagged and placed in a municipal refuse dumpster. These wastes are not considered hazardous and can be sent to a municipal landfill. Soil cuttings from the direct-push borings and water from equipment cleaning activities will be stored in individually labeled 55-gallon drums. Disposition of the 55-gallon drums will be determined upon receipt of laboratory analytical results of the soil and water samples. www.intertek.com/building