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02 August 2018 AGE-NC Project No. 18-4471 Page 4 of 5 Samples will be collected from each soil-vapor sampling point using peristaltic vacuum from a portable pump, a single use %-inch flex tubing and '/4-inch diameter dedicated polyethylene tubing. Prior to sample collection, the pump will be used to purge the boring for approximately one-to two- minutes (i.e. 3 volumes). Following the purge period, the end of the soil-vapor sample tubing will be attached to a 1-liter Tedlar bag for sample collection. After filling the Tedlar bag, the sample bag will be sealed, labeled, logged on a chain of custody form, and placed into a dry cooler (room temperature). To ensure that a reliable soil-vapor sample is collected with no ambient air breakthrough, an appropriate amount (approximately 6 to 8 ounces) of isopropyl alcohol (IPA) will be applied to cotton balls as a tracer; the wetted cotton balls will be placed at the base of the soil boring, next to the bentonite seal. All soil-vapor samples will be labeled with sample ID, project name, date, time, and samplers' initials. The samples will be logged on a chain-of-custody form, and placed into dry containers. Subsequently, all collected soil-vapor samples will be delivered/analyzed by a California Department of Public Health (CDPH)-certified analytical laboratory, for analysis of the following constituents: • TPH-g, TPH-d, TPH-mo by EPA Method 8015M. • Volatile organic compounds (VOCs) full scan in accordance with EPA Method 8260B. • IPA in accordance with EPA Method 0-15. 3.1.2. Grab Groundwater Boring Advancement and Sampling Utilizing a van-mounted Geoprobe® 5400 equipped with 1.25-inch probing rods, soil borings will be advanced to depths of approximately 50 feet bsg for collection of grab groundwater samples. The probe rig will advance soil borings using a hydraulic hammer to drive sampling rods and the sampling assembly to specified depths. Upon reaching desired grab groundwater sample depth, a Geoprobe water sampling assembly will be advanced (pushed) four feet below total depth of boring (i.e. 46 feet to 50 feet bsg), and then retracted to expose a temporary well screen. Grab groundwater samples will be collected using a Geoprobe water sampling assembly fitted with a pre- cleaned, one-inch diameter 0.01-slotted temporary well screen. Each groundwater sample will be extracted by dedicated disposable polyethylene tubing through the hollow center of the push rods into the screen section. Each grab water sample will be transferred into three laboratory-supplied, 40-milliliter (ml) volatile organic analysis (VOA) vials and into one 1-11ter amber glass container. After Advanced GeoEnvironmcntal,Inc.